WO2013132403A1 - Method and apparatus for welding and cutting for the production of disposable absorbent sanitary articles of the preclosed type that can be worn like pants - Google Patents

Method and apparatus for welding and cutting for the production of disposable absorbent sanitary articles of the preclosed type that can be worn like pants Download PDF

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Publication number
WO2013132403A1
WO2013132403A1 PCT/IB2013/051655 IB2013051655W WO2013132403A1 WO 2013132403 A1 WO2013132403 A1 WO 2013132403A1 IB 2013051655 W IB2013051655 W IB 2013051655W WO 2013132403 A1 WO2013132403 A1 WO 2013132403A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding
roller
web
cutting
composite web
Prior art date
Application number
PCT/IB2013/051655
Other languages
French (fr)
Inventor
Gabriele Sablone
Cristian Giuliani
Original Assignee
Fameccanica.Data S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fameccanica.Data S.P.A. filed Critical Fameccanica.Data S.P.A.
Publication of WO2013132403A1 publication Critical patent/WO2013132403A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15764—Transferring, feeding or handling devices; Drives
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
    • A61F13/15723—Partitioning batts; Cutting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
    • A61F13/15739—Sealing, e.g. involving cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7894—Means for handling of moving sheets or webs of continuously moving sheets or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81469—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed next to the other in a single line transverse to the feed direction, e.g. shoulder to shoulder sonotrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
    • A61F2013/15861—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding
    • A61F2013/15869—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding with ultrasonic energy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
    • A61F2013/15861—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding
    • A61F2013/15878—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding by thermal bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43129—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams said flat seams being transversal but non-orthogonal with respect to the tubular or hollow articles, i.e. oblique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins

Definitions

  • the present description relates to welding and cutting devices that can be used in the production of sanitary, articles, such as, for example, nappy-pant products of the pre-closed type.
  • a common technique for the production of sanitary products, of the pre-closed or pre-fastened type, that can be worn as pants normally referred to as "training pant” or “pull-ups" consists in providing a composite web formed by a continuous chain of blanks of product aligned so as to have the transverse axis of each individual absorbent article coinciding with the direction of movement of the web itself.
  • the continuous composite web is folded in two about the aforesaid transverse axis so as to set the opposite longitudinal edges of the web on top of one another.
  • the two flaps of the composite web thus set on top of one another are connected together with welding lines so as to define the openings for the waist and for the legs of each absorbent article.
  • the continuous chain of blanks, at the welds, is subsequently subjected to a cutting operation to divide the finished products from one another .
  • cross direction or CD
  • machine direction or MD
  • the low flexibility to the change of format is basically due to the fact that the diameter of the roller must be chosen so that the circumference is an integer multiple of the transverse development of the absorbent product that is being produced. Consequently, as the article changes, the transverse development of the absorbent article changes, and accordingly the diameter of the roller changes. As a result, the entire welding and cutting unit must be replaced.
  • the object of the present invention is to improve the technique for the production of sanitary articles of the pre-closed type that can be worn as pants so that the opposite transverse edges of each article always maintain the proper relation of shape and phase with the corresponding transverse welding line.
  • said object is achieved by equipment and by a method forming the subject of Claims 1, 4, and 12.
  • FIG. 1 is a perspective view of an absorbent product of the pre-closed pant type that can be obtained with the apparatus according to a preferred embodiment of the present invention, in a closed configuration ready for use;
  • FIG. 2 is a schematic perspective view of the absorbent product of Figure 1 in the splayed-out configuration
  • FIG. 3 is a schematic perspective view of the steps of production of an absorbent article of the type represented in Figures 1 and 2;
  • FIGS. 4 and 5 are schematic perspective views of equipment for producing the absorbent articles according to a preferred embodiment of the present invent ion ;
  • FIG. 6 is a schematic perspective view of the detail regarding the welding equipment according to a preferred embodiment of the present invention.
  • FIG. 7 is a schematic illustration of the characteristics of welding and cutting in articles obtained according to a preferred embodiment described herein;
  • FIG. 8 illustrates in side view the detail regarding the cutting device according to a preferred embodiment of the present invention.
  • FIG. 9a and 9b are each a schematic perspective view of the detail regarding the welding equipment according to a further preferred embodiment of the present invention.
  • Figure 1 the absorbent article is represented in its closed condition, where it has a conformation substantially resembling that of a pair of pants
  • Figure 2 illustrates the same product as that of Figure 1 in the splayed-out or open configuration, i.e., before it is folded about its transverse axis X2 and before the welds 13 that bestow upon it the characteristic pant-like conformation with definition of the opening for the waist 14 and the two openings for the legs 11 have been made.
  • the product 10 is made up of a chassis 1, or outer part of the absorbent product, which, during use of the sanitary article, supports the absorbent insert 2 and keeps it in contact with the body of the user.
  • Nappies of this sort may present shapes and structures different from one another; consequently, the shape and structure of the absorbent nappy that is described in the sequel of the present document is to be understood merely by way of example, to enable a better appreciation of the advantages of the present invention .
  • the absorbent product represented in Figures 1 and 2 has the chassis 1 that can be obtained from an outer sheet 4 and by an inner sheet 5, between which there can be interposed elastic elements 16 and 17 that contribute to enhancing the characteristics of wearability thereof.
  • the elastic elements 16 extend along the front waist edge 5 and rear waist edge 7 and are designed to elasticate the opening for the waist 14.
  • the elastic elements 17 are designed to elasticate the openings for the legs 11.
  • the two sheets 4 and 5 constituting the chassis 1 are normally made of non-woven fabrics that may have undergone treatments that render them impermeable to liquids so as to contain any possible leakage of liquids and prevent any possible contamination of the clothes of the user with which the chassis 1 is in contact.
  • the elastic materials 16 and 17, in turn, can be chosen from among the multiplicity of materials available on the market, such as, for example, strips made of synthetic rubber, manufactured by Fulflex, or yarn made of Lycra ® , manufactured by Invista.
  • the absorbent insert 2 located on the chassis 1, in the groin region 3, set between the two waist regions, the front one 9 and the rear one 15, and the openings for the legs 11, is the absorbent insert 2 that is designed to come into contact with the body of the user, assuming the general U shape.
  • the function of the absorbent insert 2 is that of collecting and withholding the body fluids.
  • One of the functions of the elastic elements 16 and 17 of the chassis 1 described above is that of keeping the absorbent insert 2 in the proper working position, even when it gets heavy because it has absorbed the body fluids.
  • the two sheets 4 and 5 constituting the chassis 1 and said elastic materials 16 and 17 are rendered fixed by means of adhesives and/or thanks to welds performed with heated rollers or ultrasound systems.
  • the absorbent insert 2 has a structure in which there may be recognized (in addition to various other accessory elements) :
  • top layer or topsheet 18 permeable to evacuated body liquids, designed to face the body of. the user;
  • an absorbent core 20 set between the topsheet 18 and the backsheet 19 designed to absorb and withhold exudates .
  • the absorbent product 10 and in particular on the absorbent insert 2, there may be present other characteristic elements that contribute to enhancing the wearability and absorbance thereof, such as for example the so-called “cuffs" or elasticated sides 25 set at the sides of the absorbent core 20 with the function of lateral containment of body fluids .
  • the so-called "cuffs" or elasticated sides 25 set at the sides of the absorbent core 20 with the function of lateral containment of body fluids .
  • the absorbent insert 2 and the chassis 1 are rendered fixed with respect to one another by means of adhesive strips 24 and/or by means of welds obtained with any system in itself known, such as for example mechanical or ultrasonic heat sealing.
  • Figures 1 and 2 are of a schematic nature and intend to highlight that the method and the apparatus forming the subject of the present invention may be applied to a wide variety of possible types of the absorbent product 10 .
  • FIG. 3 Schematically represented in Figure 3 is part of the method of production of an absorbent sanitary article 10 .
  • Designated by 100 in Figure 3 is a composite web, formed by a chain of blanks of absorbent sanitary products 10 , which advance continuously in a longitudinal direction A .
  • the composite web 100 has two opposite longitudinal ends 31 and 32 , which on the product provide, respectively, the front waist edge 5 and the rear waist edge 7 .
  • Said edges, during the process of manufacture of the absorbent sanitary article are set on top of one another following upon a fold around the bar 36 parallel to the longitudinal direction of advance A of the web 100 and coinciding, normally, with the axis of symmetry X2 of the individual absorbent products 10 , in the longitudinal folding station 30 , of which the bar 36 is an essential component.
  • the arrow C indicates schematically the movement of folding that leads to obtaining superposition of the longitudinal edges 31 and 32 .
  • the front flap 33 and the rear flap 34 of the web 100 are joined together at regular intervals, as illustrated in the absorbent article of the pre-closed pant type of Figure 1, which can be obtained with the apparatus according to the embodiment of the present invention exemplified herein, it being possible for said connection to be obtained by means of the two welds 13.
  • the continuous composite web is subjected to operations of cutting along the transverse lines 12 to form the individual product 10.
  • the web 100 has a continuous longitudinal portion (or band) 38 that coincides with the front waist region 9 and rear waist region 15, and a discontinuous longitudinal portion (or band) 39 that coincides with the portion that comprises the groin region 3 set between the front waist region 9 and rear waist region 15 and the openings for the legs 11.
  • FIG. 4 Schematically illustrated in Figure 4 is the apparatus 70 according to one embodiment of the present invention.
  • the apparatus 70 is made up of the equipment 40, which is able to provide transverse welding lines 13, designed to define the waistline and the openings for the legs in each pre- closed absorbent sanitary article 10 of the pant type, such as for example the one represented in Figures 1 and 2.
  • the transverse station 40 may be made up of a structure 41 where a pair of counter-rotating rollers is installed, designed to perform, one the function of welding roller 42 and the other the function of contrast roller or counter-welding roller 43.
  • the web of blanks 100 is made to pass, in the longitudinal direction of advance A, between the welding roller 42 and the counter-welding roller 43, which turn so as to have the respective tangential speeds substantially identical to one another and equal to the speed of linear advance of the chain of blanks 100.
  • the welding roller 42 and counter-welding roller 43 are driven in a known way, for example by a single motor drive with the provision of transmission means, or else, according to a currently preferred solution, illustrated in Figures 4, 5 and 6, by means of two independent motor drives constituted by two servo motors 44 and 45 controlled electronically with respect of one another, each mechanically connected by means of joints, preferably of the constant-velocity joint type 440, to the respective roller.
  • both of the rollers carry mounted within them (according to a configuration in itself known and used for example in "flow-pack” packaging machines) heating resistors and means for controlling the temperature.
  • the pressure between the two rollers is guaranteed by means in themselves known, such as for example pneumatic, or hydraulic, or mechanical systems, which are well known by persons skilled in the field and are not illustrated in the figures for simplicity of representation.
  • the roller 42 that has the function of welding roller is provided along its periphery with projecting welding blades 46a and 46b, transverse to the direction of advance of the composite web 100, in other words, substantially aligned with the axis of rotation X4 of the welding roller itself 42.
  • the welding blades 46a and 46b form with " any generatrix of the cylinder of the welding roller parallel to the axis of rotation X4 an angle of 3° to 4°.
  • FIG. 7 of the annexed drawings represents the end regions of two mutually adjacent sanitary articles 10 still connected in the production chain 100, with highlighted the two welding lines 13 and, set between them, the dashed and dotted line X5 that coincides with the line of separation 12 between the two adjacent articles 10, which will be obtained with the next cutting operation.
  • the welding lines 13 may present a slight convergence with respect to one another, such as to form a maximum angle a of approximately 6° to 8°.
  • the composite web 100 at output from the folding unit is taken up by a conveying system 50, which is in turn constituted by:
  • a first conveying means (or conveyor) 51 designed to pick up at output from the folder 30 the continuous part of the composite web 100 and feed it to the welding rollers 42 and 43; as is well known, the continuous band 38 of the web 100 has a small thickness, basically consisting of the two flaps 33 and 34 set on top of-. one another;
  • a second conveying means (or conveyor) 52 designed to convey the discontinuous band 39 of the web 100 from the folder 30 as far as the cutting assembly 60 traversing the welding unit;
  • a third conveying means (or conveyor) 53 that picks up the continuous band 38 of the web 100 leaving the welding rollers 42 and 43 and feeds it to the cutting assembly 60.
  • the first conveyor 51 may be provided by a top carriage 54 and by a bottom carriage 55. Both of the carriages are equipped with appropriate motor means (not illustrated) capable of bestowing on the web 541 of the top carriage 54 and the web 551 of the bottom carriage 55 a linear speed of advance equal to that of the web 100.
  • the two carriages 54 and 55 are provided with mechanical means, in themselves known, which are able to grip the continuous flaps 33 and 34 of the web 100 between them.
  • one or both of the belts 541 and ' 551 may be of the "suction" or “vacuum” type; i.e., they may have the surface permeable to air, which, being connected to a source of subatmospheric pressure, with means in themselves known,.... is able to increase the overall gripping force that can be applied to the web 100 by the conveyor 51.
  • the second conveyor 52 may be provided by a top carriage 56 and a bottom carriage 57. Both of the carriages are equipped with appropriate motor means 562 that are able to bestow on the belts 561 and 571 of the two respective carriages 56 and 57 a linear speed of advance equal to that of the web 100 and are able in turn to keep the discontinuous parts 39 of the web 100 gripped together thanks to mechanical means in themselves known.
  • one or both of the belts 561 and 571 belonging, respectively, to the top carriage 56 and to the bottom carriage 57 of the second conveyor 52 may be of the "suction" or “vacuum” type; i.e., they may have the surface permeable to air, which, being connected to a source of subatmospheric pressure with means and techniques well known to persons skilled in the sector, increases the overall gripping force that the conveyor 52 is able to apply to the ' web 100.
  • the conveying system 52 grips the discontinuous band 39 of the web 100 leaving the folding system 30 and accompanies it as far as the cutting assembly 60, traversing the welding station 40 without ever abandoning the discontinuous band 39 of the web 100.
  • Traversal of the welding station 40 by the second conveyor 52, as is clearly evident in Figures 5 and 6, is made possible by the fact "that the welding roller 42 and counter-welding roller 43 have, respectively, a second portion 422 and a second portion 432 with corresponding diameters 422' and 432' smaller than the diameters 421' and 431', respectively, of the first working portion 421 of the welding roller 42 and of the first working portion 431 of the counter-welding roller 43.
  • the conveying means 52 manages to traverse the welding unit 40 in the space that is created between the two second portions of welding roller 422 and counter-welding roller 432 of diameter smaller than the corresponding nominal working diameters of the first portions 421 and 431.
  • a further embodiment 90 may be implemented using the ultrasonic-welding technology.
  • the sonotrode (or sonotrodes) 95 of the ultrasonic-welding system (or systems) 92 would co-operate with the contrast roller 93 on which the welding blades 96a .and 96b are provided.
  • Said contrast roller may be provided for use in a structure where it may be set in a cantilever configuration, or may be used in a structure that envisages support thereof on either side, as is may be seen in Figure 9b.
  • the carriage contiguous to the ultrasound unit would not present limitations of overall dimensions.
  • the third conveyor 53 may be provided by a top carriage 58 and a bottom carriage 59. Both of the carriages are equipped with appropriate motor means 562, which are in common with the second conveying system 52 and are able to bestow on the web 581 of the top ' carriage 58 and the web 591 of the bottom carriage 59 a linear speed of advance equal to that of the web 100. Also the two carriages 58 and 59 are provided with mechanical means, in themselves known, which are able to grip the continuous band 38 of the web 100 between them.
  • one or both of the belts 581 and 591 may be of the "suction" or “vacuum” type; i.e., they may have the surface permeable to air, which, by being connected to a source of subatmospheric pressure with means in themselves known, is able to increase the overall gripping force that can be applied to the continuous band 38 of the web 100 by the conveyor 53.
  • the two conveying systems 52 and 53 as illustrated in Figure 4, have the purpose of feeding the web 100, made up of the chain of " blanks of absorbent articles 10, to the cutting station 60.
  • the bottom carriage 57 of the second conveying system 52 and the bottom carriage 59 of the third conveying system 53 may have the drive roller 563 in common.
  • the drive roller 563 is set in the proximity of the cutting station 60 and feeds it with the composite web 100.
  • the cutting station 60 may comprise a supporting structure 61, on which the cutting (or blade) roller 62 and the contrast (or counter-blade) roller 63 are mounted.
  • the blade roller 62 and counter-blade roller 63 may be motor-driven by a drive means 65 that in the preferred configuration may be constituted by an electronically controlled servo motor, which, in turn, may be mechanically connected to the cutting or blade roller 62 by means of an appropriate constant-velocity joint.
  • the blade roller 62 drives the counter-blade roller 63 by means of a system of transmission of motion that may be of the gear type 64, where the gears, i.e., the drive gear 641 and driven gear 642, are fitted, respectively, on the blade roller 62 and on the counter-blade roller 63.
  • the blade roller carries on its surface at least one cutting blade 621.
  • Each blade 621 co-operates with the counter-blade roller 63 on a corresponding contrast insert 631.
  • the blade 621 and the counter-blade roller 63 in particular the contrast insert 631, must have peripheral speeds that are substantially the same as one another and equal to the speed of feed of the composite web 100. Consequently, the diameter of the counter-blade roller 63 must be chosen so as to have a development of the circumference equal to an integer multiple of the transverse development 8 of the product 10 of Figure 2 in the splayed-out condition.
  • the cutting station 60 is one of those components of the production line that must undergo the operations of change of format when it is decided to produce an absorbent article of different dimensions (change of size) .
  • the action of gripping of the composite web 100 may be further improved by getting said web 100, both the longitudinal continuous portion (or band) 38 and the discontinuous longitudinal portion (or band) 39 of the web 100, to describe an S-shaped path .
  • the action of gripping of the composite web 100 may be rendered even more effective by causing the permeable surfaces of the belts 571 and 591 . to be connected to a source of subatmospheric pressure also in an area corresponding to the drive roller 563 and causing also the surface of the counter-blade roller 63 to be able to exert an action of suction. Said suction action is provided in selected sectors of the circumference of the two rollers 563 and 63, as illustrated in Figure 8. In this way, the two rollers, i.e., the drive roller 563 and the counter-blade roller 63, manage to grip, respectively, the bottom surface and the top surface both of the continuous band 38 and of the discontinuous band 39 of the composite web 100 simultaneously.
  • the drive roller 563 in this case, is perforated in a radial direction with holes 564 made in its mantle surface and arranged in rows that extend along the generatrices of the roller- 563, each row of holes 564 coming under a respective manifold 565, which is in turn connected, by means of an appropriate distributor 566, held in a fixed position, to said source of subatmospheric pressure (not represented in the drawings ) .
  • the counter-blade roller 63 is perforated in a radial direction by holes 632 made in its mantle surface and arranged in rows that extend along the generatrices of the roller 63, each row of holes 632 coming under a respective manifold 633, which is in turn connected, by means of an appropriate distributor 634, held in a fixed position, to said source of subatmospheric pressure (not represented in the drawings) .
  • the counter-blade roller 63 may present, on its surface, recesses 635, housed in which are the parts of larger thickness of the absorbent article, i.e., the parts in which the absorbent material of the insert 20 is present.
  • the cutting roller 62 may present on its surface a shell 622, normally made of thermoplastic material, which is able to grip the edge of the continuous band 38 of the web 100 that is created when the blade 621 has separated each absorbent article 10 therefrom.

Abstract

A method for producing sanitary articles of the pre-closed pant type (10) comprising the steps of: - folding longitudinally in two a composite web (100), formed by a chain of blanks of absorbent sanitary products (10), which advance in a longitudinal direction (A), so as to form a continuous longitudinal portion of web and a discontinuous portion of web, the continuous portion comprising the waist regions, the discontinuous portion being basically constituted by the absorbent insert; - welding (40) the continuous portion (38) of the web (100) with welding lines (13) that are transverse to the longitudinal direction of advance (A) so as to form the waist circumference and the openings for the legs (11) of the sanitary article (10); - conveying (50)- the composite web (100) through the welding station (40) maintaining the positive grip of the discontinuous parts (39) of said composite web (100); - feeding the cutting station (60) with said composite web (100), maintaining the positive grip of the discontinuous parts (39) of said composite web (100); and - cutting said composite web (100) to separate the individual sanitary articles (10) from one another.

Description

"Method and apparatus for welding and cutting for the production of disposable absorbent sanitary articles of the preclosed type that can be worn like pants"
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TEXT OF THE DESCRIPTION
Technical field
The present description relates to welding and cutting devices that can be used in the production of sanitary, articles, such as, for example, nappy-pant products of the pre-closed type.
The reference to this specific field of application must not, on the other hand, be interpreted in a sense that limits the scope of the invention.
Technological background
A common technique for the production of sanitary products, of the pre-closed or pre-fastened type, that can be worn as pants, normally referred to as "training pant" or "pull-ups", consists in providing a composite web formed by a continuous chain of blanks of product aligned so as to have the transverse axis of each individual absorbent article coinciding with the direction of movement of the web itself. The continuous composite web is folded in two about the aforesaid transverse axis so as to set the opposite longitudinal edges of the web on top of one another. The two flaps of the composite web thus set on top of one another are connected together with welding lines so as to define the openings for the waist and for the legs of each absorbent article. The continuous chain of blanks, at the welds, is subsequently subjected to a cutting operation to divide the finished products from one another .
This particular methodology of production is normally identified with 'the term "cross direction" (or CD) to distinguish it from the more traditional form of production, referred to as "machine direction" (or MD) , which forms the absorbent articles while they travel with their own longitudinal axis parallel to the direction of production.
An example of a method of production of absorbent sanitary products of the CD type is described in the documents Nos . EP-A-1 013 251 and IT-0001379452 , filed in the name of the present applicant.
In CD methods, it is necessary to ensure proper positioning of the transverse welds of each product so as to define properly the openings for the waist and for the legs of each individual nappy. Moreover, it is important for the cutting line envisaged for dividing the individual products from one another to be properly positioned at the welds made between two adjacent absorbent products and it is even more important for both the welds and the cuts to present a constant angular position with respect to the direction of advance of the web; i.e., in other words, at least the cuts must always present the same angular relation with respect to the edges of the composite web.
According to the known art, to obtain sanitary articles with the welds and the cuts in a proper phase relation with respect to one another and with an angular relation with respect to the edges of the article constant in time, there becomes necessary extremely complex and costly equipment, where said operations of welding and cutting are performed on a single roller run over which is the continuous web made up of the blanks of the individual absorbent articles.
It is obvious to the person skilled in the branch that a solution of this sort brings with it problems that are difficult to solve, such as for example the complexity of the apparatus and the low flexibility in the change of the format of the articles, with the consequent rise in the operating costs. The low flexibility to the change of format is basically due to the fact that the diameter of the roller must be chosen so that the circumference is an integer multiple of the transverse development of the absorbent product that is being produced. Consequently, as the article changes, the transverse development of the absorbent article changes, and accordingly the diameter of the roller changes. As a result, the entire welding and cutting unit must be replaced.
The complexity of the known equipment derives from the fact that the cutting and welding tools must be accommodated around a single roller that functions as contrast roller both for the welding operation and the cutting operation. Consequently, said roller must be of large diameter to be able to house on its periphery both the welding mechanisms and the cutting devices and, on account of the delicacy of both processes, said roller must present an equally high precision that raises the costs thereof.
The foregoing is aggravated by the fact that to be able to carry out a weld of adequate mechanical characteristics it is necessary to heat the composite web formed by the continuous chain of blanks. For this purpose, normally said heating is obtained by inserting resistances in the areas that are to be welded, which are obviously also cutting areas. On account of the large diameter of the contrast roller, and hence on account of the resulting considerable mass, management of the temperature of said contrast areas presents problems that are difficult to solve and lead to 'the reduction of the working life of the welding and cutting tools, which, inevitably, are affected by the variations in temperature and hence by the consequent dimensional variations of the common contrast element. Object and summary
The object of the present invention is to improve the technique for the production of sanitary articles of the pre-closed type that can be worn as pants so that the opposite transverse edges of each article always maintain the proper relation of shape and phase with the corresponding transverse welding line.
According to the present invention, said object is achieved by equipment and by a method forming the subject of Claims 1, 4, and 12.
The claims form an integral part of the technical teaching provided herein in relation to the invention.
Brief description of the drawings
The invention will now be described, purely by way of non-limiting example, with reference to the annexed drawings, in which:
- Figure 1 is a perspective view of an absorbent product of the pre-closed pant type that can be obtained with the apparatus according to a preferred embodiment of the present invention, in a closed configuration ready for use;
- Figure 2 is a schematic perspective view of the absorbent product of Figure 1 in the splayed-out configuration;
- Figure 3 is a schematic perspective view of the steps of production of an absorbent article of the type represented in Figures 1 and 2;
- Figures 4 and 5 are schematic perspective views of equipment for producing the absorbent articles according to a preferred embodiment of the present invent ion ;
- Figure 6 is a schematic perspective view of the detail regarding the welding equipment according to a preferred embodiment of the present invention;
- Figure 7 is a schematic illustration of the characteristics of welding and cutting in articles obtained according to a preferred embodiment described herein;
- Figure 8 illustrates in side view the detail regarding the cutting device according to a preferred embodiment of the present invention; and
- Figures 9a and 9b are each a schematic perspective view of the detail regarding the welding equipment according to a further preferred embodiment of the present invention.
Detailed description of the embodiments
Illustrated in the ensuing description are various specific details aimed at providing an in-depth understanding of the embodiments. The embodiments may be obtained without one or more of the specific details, or with other methods, components, materials, etc. In other cases, known structures, materials, or operations are not illustrated or described in detail so that various aspects of the embodiments will not be obscured.
Reference to "an embodiment" or "one embodiment" in the framework of the present description is intended to indicate that a particular configuration, structure, or characteristic described in relation to the embodiment is comprised in at least one embodiment. Hence, phrases such as "in an embodiment" or "in one embodiment" that may be present in various points of the present description do not necessarily refer to one and the same embodiment. Moreover, particular conformations, structures, or characteristics may be adequately combined in one or more embodiments'.
The references used herein are provided merely for convenience and hence do not define the sphere of protection or the scope of the embodiments. Consequently, the definitions "front" or "rear" referring to the absorbent sanitary article depend only upon the final use of the product itself, i.e., upon how it is worn by the user, whereas the definitions "top" or "bottom" regarding possible elements present in one or more embodiments described depend only upon the viewing point of the observer with respect to the drawings annexed to the present document, without thereby limiting the principle and/or the scope of the invention .
With reference to Figures 1 and 2, designated by
10 is a disposable absorbent product of the so-called "pull-on" or "training-pant" type, obtained with a method and an apparatus in accordance with the teachings provided by the present invention.
In Figure 1, the absorbent article is represented in its closed condition, where it has a conformation substantially resembling that of a pair of pants, whereas Figure 2 illustrates the same product as that of Figure 1 in the splayed-out or open configuration, i.e., before it is folded about its transverse axis X2 and before the welds 13 that bestow upon it the characteristic pant-like conformation with definition of the opening for the waist 14 and the two openings for the legs 11 have been made.
In basic terms, the product 10 is made up of a chassis 1, or outer part of the absorbent product, which, during use of the sanitary article, supports the absorbent insert 2 and keeps it in contact with the body of the user.
Nappies of this sort may present shapes and structures different from one another; consequently, the shape and structure of the absorbent nappy that is described in the sequel of the present document is to be understood merely by way of example, to enable a better appreciation of the advantages of the present invention .
The absorbent product represented in Figures 1 and 2 has the chassis 1 that can be obtained from an outer sheet 4 and by an inner sheet 5, between which there can be interposed elastic elements 16 and 17 that contribute to enhancing the characteristics of wearability thereof.
The elastic elements 16 extend along the front waist edge 5 and rear waist edge 7 and are designed to elasticate the opening for the waist 14. The elastic elements 17 are designed to elasticate the openings for the legs 11.
The two sheets 4 and 5 constituting the chassis 1 are normally made of non-woven fabrics that may have undergone treatments that render them impermeable to liquids so as to contain any possible leakage of liquids and prevent any possible contamination of the clothes of the user with which the chassis 1 is in contact.
The elastic materials 16 and 17, in turn, can be chosen from among the multiplicity of materials available on the market, such as, for example, strips made of synthetic rubber, manufactured by Fulflex, or yarn made of Lycra®, manufactured by Invista.
In the absorbent product, represented in Figures 1 and 2, located on the chassis 1, in the groin region 3, set between the two waist regions, the front one 9 and the rear one 15, and the openings for the legs 11, is the absorbent insert 2 that is designed to come into contact with the body of the user, assuming the general U shape. The function of the absorbent insert 2 is that of collecting and withholding the body fluids.
One of the functions of the elastic elements 16 and 17 of the chassis 1 described above is that of keeping the absorbent insert 2 in the proper working position, even when it gets heavy because it has absorbed the body fluids.
The two sheets 4 and 5 constituting the chassis 1 and said elastic materials 16 and 17 are rendered fixed by means of adhesives and/or thanks to welds performed with heated rollers or ultrasound systems.
The absorbent insert 2 has a structure in which there may be recognized (in addition to various other accessory elements) :
- a top layer or topsheet 18 permeable to evacuated body liquids, designed to face the body of. the user;
- a bottom layer or backsheet 19 impermeable to body liquids and designed to face the outside, i.e., the chassis 1; and
- an absorbent core 20 set between the topsheet 18 and the backsheet 19 designed to absorb and withhold exudates .
On the absorbent product 10, and in particular on the absorbent insert 2, there may be present other characteristic elements that contribute to enhancing the
Figure imgf000009_0001
wearability and absorbance thereof, such as for example the so-called "cuffs" or elasticated sides 25 set at the sides of the absorbent core 20 with the function of lateral containment of body fluids .
For a more detailed description of the elements listed above and of other elements, well known to persons skilled in the art, the reader is referred to the extensive literature existing on the subject, such as for example the patent No. US 4,704,116, granted on November 3, 1987 to Enloe.
In a possible embodiment, as highlighted in Figures 1 and 2, the absorbent insert 2 and the chassis 1 are rendered fixed with respect to one another by means of adhesive strips 24 and/or by means of welds obtained with any system in itself known, such as for example mechanical or ultrasonic heat sealing.
As highlighted in Figure 2, moreover, on the chassis 1 there is normally made a cut 6 of appropriate shape that defines and delineates the contour of the openings for the legs 11 .
As is evident to the person skilled in the art, the representations of Figures 1 and 2 are of a schematic nature and intend to highlight that the method and the apparatus forming the subject of the present invention may be applied to a wide variety of possible types of the absorbent product 10 .
Schematically represented in Figure 3 is part of the method of production of an absorbent sanitary article 10 . Designated by 100 in Figure 3 is a composite web, formed by a chain of blanks of absorbent sanitary products 10 , which advance continuously in a longitudinal direction A . The composite web 100 has two opposite longitudinal ends 31 and 32 , which on the product provide, respectively, the front waist edge 5 and the rear waist edge 7 . Said edges, during the process of manufacture of the absorbent sanitary article, are set on top of one another following upon a fold around the bar 36 parallel to the longitudinal direction of advance A of the web 100 and coinciding, normally, with the axis of symmetry X2 of the individual absorbent products 10 , in the longitudinal folding station 30 , of which the bar 36 is an essential component. The arrow C indicates schematically the movement of folding that leads to obtaining superposition of the longitudinal edges 31 and 32 . After the fold about the longitudinal axis X2 the front flap 33 and the rear flap 34 of the web 100 , respectively connected at the longitudinal edges 31 and 32, are joined together at regular intervals, as illustrated in the absorbent article of the pre-closed pant type of Figure 1, which can be obtained with the apparatus according to the embodiment of the present invention exemplified herein, it being possible for said connection to be obtained by means of the two welds 13.
An example of equipment and of method 30 suitable for making a fold of this sort is described in the document No. TO2011A001085 , filed in the name of the present applicant.
After the operations of folding and closing, the continuous composite web is subjected to operations of cutting along the transverse lines 12 to form the individual product 10.
It will be appreciated from Figures 1 and 2 what may be the complexity of the web that is generated in a production method in which the blanks of products 10 extend in a direction transverse to the direction of movement. It will moreover be appreciated that the structure of the web and its management become even more complex once it is folded in two. In fact, on account of superposition of the sheet, the differences of thickness both in the transverse direction and in the longitudinal direction of the web 100 are considerably amplified and problems are generated in conveyance of the web 100 on account of its discontinuity generated by the cuts 6 for providing the openings for the legs 11 present on each article 10. In fact, as is clearly illustrated in Figure 3, the web 100 has a continuous longitudinal portion (or band) 38 that coincides with the front waist region 9 and rear waist region 15, and a discontinuous longitudinal portion (or band) 39 that coincides with the portion that comprises the groin region 3 set between the front waist region 9 and rear waist region 15 and the openings for the legs 11.
From what has been said, it will hence be appreciated how problematical it is to ensure that during the operations of welding and cutting of each product 10 there is always kept an accurate phase relation between the transverse welds 13 and the cuts 12, as well as a constant angular relation between the aforesaid transverse welds 13 and the cuts 12 with respect to the waist edges 5 and 7 of each absorbent article 10.
Schematically illustrated in Figure 4 is the apparatus 70 according to one embodiment of the present invention.
In the embodiment exemplified, the apparatus 70 is made up of the equipment 40, which is able to provide transverse welding lines 13, designed to define the waistline and the openings for the legs in each pre- closed absorbent sanitary article 10 of the pant type, such as for example the one represented in Figures 1 and 2.
In the preferred embodiment, as illustrated in Figure 5, the transverse station 40 may be made up of a structure 41 where a pair of counter-rotating rollers is installed, designed to perform, one the function of welding roller 42 and the other the function of contrast roller or counter-welding roller 43.
The web of blanks 100 is made to pass, in the longitudinal direction of advance A, between the welding roller 42 and the counter-welding roller 43, which turn so as to have the respective tangential speeds substantially identical to one another and equal to the speed of linear advance of the chain of blanks 100.
The welding roller 42 and counter-welding roller 43 are driven in a known way, for example by a single motor drive with the provision of transmission means, or else, according to a currently preferred solution, illustrated in Figures 4, 5 and 6, by means of two independent motor drives constituted by two servo motors 44 and 45 controlled electronically with respect of one another, each mechanically connected by means of joints, preferably of the constant-velocity joint type 440, to the respective roller.
In the device described herein, the action of welding is obtained with the combined application of pressure and heat. For this purpose, both of the rollers carry mounted within them (according to a configuration in itself known and used for example in "flow-pack" packaging machines) heating resistors and means for controlling the temperature.
The pressure between the two rollers is guaranteed by means in themselves known, such as for example pneumatic, or hydraulic, or mechanical systems, which are well known by persons skilled in the field and are not illustrated in the figures for simplicity of representation.
The roller 42 that has the function of welding roller is provided along its periphery with projecting welding blades 46a and 46b, transverse to the direction of advance of the composite web 100, in other words, substantially aligned with the axis of rotation X4 of the welding roller itself 42. In the preferred embodiments illustrated in the present document, the welding blades 46a and 46b form with "any generatrix of the cylinder of the welding roller parallel to the axis of rotation X4 an angle of 3° to 4°.
The roller 43 that has the function of contrast roller has, instead, a completely smooth surface of the mantle. Figure 7 of the annexed drawings represents the end regions of two mutually adjacent sanitary articles 10 still connected in the production chain 100, with highlighted the two welding lines 13 and, set between them, the dashed and dotted line X5 that coincides with the line of separation 12 between the two adjacent articles 10, which will be obtained with the next cutting operation.
As is known, and as is clearly highlighted in Figure 7, the welding lines 13 may present a slight convergence with respect to one another, such as to form a maximum angle a of approximately 6° to 8°.
In the preferred embodiment, as illustrated in Figure 4, the composite web 100 at output from the folding unit is taken up by a conveying system 50, which is in turn constituted by:
a first conveying means (or conveyor) 51, designed to pick up at output from the folder 30 the continuous part of the composite web 100 and feed it to the welding rollers 42 and 43; as is well known, the continuous band 38 of the web 100 has a small thickness, basically consisting of the two flaps 33 and 34 set on top of-. one another;
a second conveying means (or conveyor) 52, designed to convey the discontinuous band 39 of the web 100 from the folder 30 as far as the cutting assembly 60 traversing the welding unit; and
a third conveying means (or conveyor) 53 that picks up the continuous band 38 of the web 100 leaving the welding rollers 42 and 43 and feeds it to the cutting assembly 60.
In the preferred embodiment, as highlighted more clearly in Figure 5, the first conveyor 51 may be provided by a top carriage 54 and by a bottom carriage 55. Both of the carriages are equipped with appropriate motor means (not illustrated) capable of bestowing on the web 541 of the top carriage 54 and the web 551 of the bottom carriage 55 a linear speed of advance equal to that of the web 100. The two carriages 54 and 55 are provided with mechanical means, in themselves known, which are able to grip the continuous flaps 33 and 34 of the web 100 between them. Moreover, in order to increase the gripping capacity of the chain of blanks 100 exerted by the aforesaid carriages 54 and 55, one or both of the belts 541 and ' 551 may be of the "suction" or "vacuum" type; i.e., they may have the surface permeable to air, which, being connected to a source of subatmospheric pressure, with means in themselves known,.... is able to increase the overall gripping force that can be applied to the web 100 by the conveyor 51.
In the preferred embodiment, also the second conveyor 52 may be provided by a top carriage 56 and a bottom carriage 57. Both of the carriages are equipped with appropriate motor means 562 that are able to bestow on the belts 561 and 571 of the two respective carriages 56 and 57 a linear speed of advance equal to that of the web 100 and are able in turn to keep the discontinuous parts 39 of the web 100 gripped together thanks to mechanical means in themselves known.
In order to increase the gripping capacity of the discontinuous parts of the web 100, also in this case, one or both of the belts 561 and 571 belonging, respectively, to the top carriage 56 and to the bottom carriage 57 of the second conveyor 52, may be of the "suction" or "vacuum" type; i.e., they may have the surface permeable to air, which, being connected to a source of subatmospheric pressure with means and techniques well known to persons skilled in the sector, increases the overall gripping force that the conveyor 52 is able to apply to the ' web 100. The conveying system 52 grips the discontinuous band 39 of the web 100 leaving the folding system 30 and accompanies it as far as the cutting assembly 60, traversing the welding station 40 without ever abandoning the discontinuous band 39 of the web 100. Traversal of the welding station 40 by the second conveyor 52, as is clearly evident in Figures 5 and 6, is made possible by the fact "that the welding roller 42 and counter-welding roller 43 have, respectively, a second portion 422 and a second portion 432 with corresponding diameters 422' and 432' smaller than the diameters 421' and 431', respectively, of the first working portion 421 of the welding roller 42 and of the first working portion 431 of the counter-welding roller 43. As illustrated in Figure 5, the conveying means 52 manages to traverse the welding unit 40 in the space that is created between the two second portions of welding roller 422 and counter-welding roller 432 of diameter smaller than the corresponding nominal working diameters of the first portions 421 and 431.
Other equivalent embodiments may be devised by the person skilled in the branch, for example using a "cantilever" configuration of the welding roller and counter-welding roller, as illustrated in Figure 9a, i.e., positioning both of the supports of both the welding roller 42 and the counter-welding roller 43 in a position corresponding to the means for driving the rollers themselves, consequently leaving completely free the opposite area, i.e., the area facing the line operator in which the discontinuous band 39 of the composite web 100 normally passes when it is folded.
A further embodiment 90, illustrated in Figure 9b, may be implemented using the ultrasonic-welding technology. In this case, the sonotrode (or sonotrodes) 95 of the ultrasonic-welding system (or systems) 92 would co-operate with the contrast roller 93 on which the welding blades 96a .and 96b are provided. Said contrast roller may be provided for use in a structure where it may be set in a cantilever configuration, or may be used in a structure that envisages support thereof on either side, as is may be seen in Figure 9b. Obviously, in the latter configuration there would always be the portion of roller 932 with the diameter 932' reduced with respect to the first diameter 931' of the first portion of the contrast roller 931. In any case, it is evident that the carriage contiguous to the ultrasound unit would not present limitations of overall dimensions.
In the preferred embodiment, the third conveyor 53 may be provided by a top carriage 58 and a bottom carriage 59. Both of the carriages are equipped with appropriate motor means 562, which are in common with the second conveying system 52 and are able to bestow on the web 581 of the top ' carriage 58 and the web 591 of the bottom carriage 59 a linear speed of advance equal to that of the web 100. Also the two carriages 58 and 59 are provided with mechanical means, in themselves known, which are able to grip the continuous band 38 of the web 100 between them. Moreover, in order to increase the gripping capacity of the chain of blanks 100 provided by said carriages 58 and 59, one or both of the belts 581 and 591 may be of the "suction" or "vacuum" type; i.e., they may have the surface permeable to air, which, by being connected to a source of subatmospheric pressure with means in themselves known, is able to increase the overall gripping force that can be applied to the continuous band 38 of the web 100 by the conveyor 53.
In the preferred embodiment, the two conveying systems 52 and 53, as illustrated in Figure 4,. have the purpose of feeding the web 100, made up of the chain of "blanks of absorbent articles 10, to the cutting station 60. For this purpose, the bottom carriage 57 of the second conveying system 52 and the bottom carriage 59 of the third conveying system 53 may have the drive roller 563 in common. In the embodiment described herein, the drive roller 563 is set in the proximity of the cutting station 60 and feeds it with the composite web 100.
The cutting station 60 may comprise a supporting structure 61, on which the cutting (or blade) roller 62 and the contrast (or counter-blade) roller 63 are mounted. The blade roller 62 and counter-blade roller 63 may be motor-driven by a drive means 65 that in the preferred configuration may be constituted by an electronically controlled servo motor, which, in turn, may be mechanically connected to the cutting or blade roller 62 by means of an appropriate constant-velocity joint. Furthermore, the blade roller 62 drives the counter-blade roller 63 by means of a system of transmission of motion that may be of the gear type 64, where the gears, i.e., the drive gear 641 and driven gear 642, are fitted, respectively, on the blade roller 62 and on the counter-blade roller 63.
As illustrated more clearly in Figure 8, in the preferred embodiment, the blade roller carries on its surface at least one cutting blade 621.
Each blade 621 co-operates with the counter-blade roller 63 on a corresponding contrast insert 631.
As is known, the blade 621 and the counter-blade roller 63, in particular the contrast insert 631, must have peripheral speeds that are substantially the same as one another and equal to the speed of feed of the composite web 100. Consequently, the diameter of the counter-blade roller 63 must be chosen so as to have a development of the circumference equal to an integer multiple of the transverse development 8 of the product 10 of Figure 2 in the splayed-out condition.
Obviously, what has been said makes it clear that the cutting station 60 is one of those components of the production line that must undergo the operations of change of format when it is decided to produce an absorbent article of different dimensions (change of size) .
As may be appreciated from the representation of Figure 8, during the step of feed of the cutting station 60, the composite web 100 is stably held, without ever being released; in fact, both the continuous band 38 and the discontinuous band 39 of said web 100, .passing from said roller 563 of the conveying means 50 to said counter-blade roller 63 of said cutting unit 60 follow a curvilinear path before the continuous band 38 of said web 100 is subjected to the action of cutting by the blade.
According to a preferred embodiment, as illustrated in Figure 8, the action of gripping of the composite web 100 may be further improved by getting said web 100, both the longitudinal continuous portion (or band) 38 and the discontinuous longitudinal portion (or band) 39 of the web 100, to describe an S-shaped path .
The action of gripping of the composite web 100 may be rendered even more effective by causing the permeable surfaces of the belts 571 and 591 .to be connected to a source of subatmospheric pressure also in an area corresponding to the drive roller 563 and causing also the surface of the counter-blade roller 63 to be able to exert an action of suction. Said suction action is provided in selected sectors of the circumference of the two rollers 563 and 63, as illustrated in Figure 8. In this way, the two rollers, i.e., the drive roller 563 and the counter-blade roller 63, manage to grip, respectively, the bottom surface and the top surface both of the continuous band 38 and of the discontinuous band 39 of the composite web 100 simultaneously.
It is possible to keep under suction a drive roller over which belts are run using, for example, the belts identified by the trademark Conducto® produced and marketed by the firm GKD - Gebr. Kufferath AG, Metallweberstrasse No. 46, 52353 Dueren, Germany. The drive roller 563, in this case, is perforated in a radial direction with holes 564 made in its mantle surface and arranged in rows that extend along the generatrices of the roller- 563, each row of holes 564 coming under a respective manifold 565, which is in turn connected, by means of an appropriate distributor 566, held in a fixed position, to said source of subatmospheric pressure (not represented in the drawings ) .
Likewise, the counter-blade roller 63 is perforated in a radial direction by holes 632 made in its mantle surface and arranged in rows that extend along the generatrices of the roller 63, each row of holes 632 coming under a respective manifold 633, which is in turn connected, by means of an appropriate distributor 634, held in a fixed position, to said source of subatmospheric pressure (not represented in the drawings) . In addition, the counter-blade roller 63 may present, on its surface, recesses 635, housed in which are the parts of larger thickness of the absorbent article, i.e., the parts in which the absorbent material of the insert 20 is present. Consequently, the web 100 thus gripped thanks to the action exerted by the vacuum of the drive roller 563 and of the counter-blade roller 63, is segmented by the blade 621 of the cutting roller 62, in an area corresponding to the continuous band 38, into the plurality of disposable absorbent products 10, which are in turn transferred by the counter-blade roller 63 to the equipment set downstream of the cutting station 60, which carries out the further operations of longitudinal and/or transverse folding of the absorbent article, as well as counting, grouping, and packaging the products .
According to a preferred embodiment, as illustrated in Figure 8, the cutting roller 62 may present on its surface a shell 622, normally made of thermoplastic material, which is able to grip the edge of the continuous band 38 of the web 100 that is created when the blade 621 has separated each absorbent article 10 therefrom.
Of course, without prejudice to the principle of the invention, the details of construction and the embodiments may vary, even significantly, with respect to what has been illustrated herein purely by way of non-limiting example, without thereby departing from the scope of the invention as defined by the annexed claims .

Claims

1. A device for welding and cutting a composite web formed by a chain of blanks of absorbent sanitary products (100), which advance continuously in a longitudinal direction (A) , and comprising a -continuous longitudinal portion of web (38) and a discontinuous longitudinal portion of web (39) , said device comprising :
- at least one welding station (40) , wherein said station comprises a welding roller (42) that has a first portion (421) with a first diameter (421' ) located on which is at least one welding blade (46a and 46b), a counter-welding contrast roller (43) , which has a first portion (431) with a first diameter (431' ) that co-operates with the at least one welding blade (46a and 46b) functioning as contrast surface for the welding oepration;
- a cutting station (60), wherein said station comprises a cutting roller (62) located on which is the blade (621), a counter-blade contrast roller (63) , which co-operates with the cutting blade functioning as contrast surface for the cut (631) ; and
- conveying means (50) comprising at least one conveyor belt (52) designed to convey the discontinuous longitudinal portion (39) of said composite web (100) through said welding unit (40), adjacent to said welding roller (42) and to said counter-welding roller (43), wherein said at least one conveyor belt (52) feeds the aforesaid cutting station (60) .
2. The device according to Claim 1, wherein in said at least one welding station (40) at least one between said welding roller (42) and counter-welding roller (43) has a second portion (422, 432) coaxial and adjacent to said first portion (421, 431) with a second diameter (422', 432') smaller than the first diameter (421' , 431' ) .
3. The device according to Claim 1, wherein in said at least one welding station (40) :
- the welding roller (42) has a second portion (422) coaxial and adjacent to the first portion (421) with a second diameter (422') smaller than the diameter (421' ) of said first portion (421) ; and
- the counter-welding roller (43) has a second portion (432) coaxial and adjacent to the first portion (431) with a second diameter (432') smaller than the diameter (431' ) of said first portion (431) .
4. A device for welding and cutting a composite web formed by a chain of blanks of absorbent sanitary products (100), -which advance continuously in a longitudinal direction (A) , and comprising a continuous longitudinal portion of web (38) and a discontinuous longitudinal portion of web (39), said device comprising :
- at least one welding station (90),' wherein said station comprises at least one ultrasonic welding unit
(92) that co-operates with at least one welding blade (96a and 96b) set on a contrast roller (93) that has a first portion (931) with a first diameter (931') ;
- a cutting station (60), wherein said station comprises a cutting roller (62) located on which is a blade (621), a ..counter-blade contrast roller (63) that co-operates with the cutting roller functioning as contrast surface for the cut (631) ; and
- conveying means (50) comprising at least one conveyor belt (52) designed to convey the discontinuous longitudinal portion (39) of the aforesaid composite web (100) through said welding unit (90) , adjacent to said at least one ultrasonic welding unit (92) and to said contrast roller (93), wherein said at least one conveyor belt (52) feeds said cutting station (60) .
5. The device according to Claim 4, wherein, in said at least one welding station (90) , said contrast roller (93) has a second portion (932) coaxial and adjacent to said first portion (931) , with a second diameter (932') smaller than -the first diameter (931' ) .
6. The device according to any one of the preceding claims, wherein the at least one conveyor belt (52) is connected to at least one source of subatmospheric pressure.
7. The device according to Claim 6, wherein said conveying means (50) comprising a first, bottom, web (57) - and a second, top, web (56) designed to grip between them respective mutually facing surfaces of the discontinuous longitudinal portion (39) of said composite web (100) .
8. The device according to any one of the preceding claims, wherein said conveying means (50) comprise at least one roller (563) set in the proximity of the counter-blade roller (63) of said cutting unit (60) , set in such a way that both the continuous longitudinal portion (38) and the discontinuous longitudinal portion (39) of the web (100), passing from said roller (563) of the conveying means (50) to said counter-blade roller (63) of .said cutting unit (60), follow a curvilinear path before said continuous longitudinal portion (38) of said web (100) udergoes the action of cutting by means of the blade (621) .
9. The device according to Claim 8, wherein the at least one roller (563) of said conveying means (50) comprise means (632, 633) for gripping said composite web (100) , said gripping means (632, 633) preferably comprising subatmospheric-pressure gripping means.
10. The device according to any one of the preceding claims, wherein said counter-blade roller (63) of said cutting station (60) comprises, on the outer surface, recesses (635) designed to receive the parts of larger thickness of said composite web (100, 10) .
11. The device according to any one of the preceding claims, wherein said counter-blade roller (63) of said cutting station (60) comprises means (632, 633) for gripping said composite web (100, 10) , said gripping means (632, 633) preferably comprising subatmospheric-pressure gripping means.
12. A method for the production of sanitary articles of the pre-closed pant type (10) comprising the steps of:
- folding longitudinally in two a composite web (100) , formed by a chain of blanks of absorbent sanitary products (10), which advance continuously in a longitudinal direction (A) , said web comprising a continuous longitudinal portion . of web (38) and a discontinuous longitudinal portion of web (39) , the continuous portion comprising the waist regions (9 and 15) , the discontinuous portion comprising the groin region (3) set between the two waist regions (9, 15) and the openings for the legs (11) ;
- welding (40) said composite web (100) in the continuous longitudinal portion (38) with welding lines (13) transverse to the longitudinal direction of advance (A) , set at a distance from one another by a pitch equal to the width (8) of said sanitary article and designed to form the waist circumference (7, 5) and the openings for the legs (11) of the sanitary article (10) ;
- conveying the composite web (100) through the welding station (40) maintaining a positive grip of the discontinuous portions (39) of said composite web (100) ;
- feeding the cutting station (60) with said composite web (100), maintaining the positive grip of the discontinuous longitudinal portions (39) of said composite web (100) ; and
- cutting said composite web (100) in the continuous longitudinal portion (38) with cuts (12) transverse to the longitudinal direction (A) of advance, set at a distance from one another by a pitch equal to the width (8) of said sanitary article (10) and designed to separate the individual sanitary articles (10) from one another.
13. The method according to Claim 12, wherein, in the steps of conveyance and feed of the composite web (100), the discontinuous longitudinal portion (39) of said web (100) is kept positively gripped by at least one pair of mutually facing conveying means (56 and 57) .
14. The method according to Claim 12 or Claim 13, wherein, in the steps of conveyance and feed of the composite web (100), the discontinuous portion (39) of said web (100) is kept positively gripped by " subatmospheric-pressure gripping means.
15. The method according to any one of Claims 12 to 14, wherein, in the cutting step (60) , parts of larger thickness of the discontinuous portion (39) of the composite web (100) are received and kept positively gripped by subatmospheric-pressure gripping means in respective recesses (635) present on the outer surface of said counter-blade roller (63) .
PCT/IB2013/051655 2012-03-09 2013-03-01 Method and apparatus for welding and cutting for the production of disposable absorbent sanitary articles of the preclosed type that can be worn like pants WO2013132403A1 (en)

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IT000210A ITTO20120210A1 (en) 2012-03-09 2012-03-09 METHOD AND APPARATUS FOR WELDING AND CUTTING FOR THE PRODUCTION OF SINGLE-USE HYGIENIC-SANITARY ABSORBENT ARTICLES WEARABLE IN GUISA DI MUTANDINA, OF THE PRECOURED TYPE

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017207226A1 (en) * 2017-04-28 2018-10-31 Robert Bosch Gmbh Device for sealing a packaging material web
US10561537B2 (en) 2016-08-12 2020-02-18 The Procter & Gamble Company Elastic laminates and methods for assembling elastic laminates for absorbent articles
US10952910B2 (en) 2017-03-27 2021-03-23 The Procter & Gamble Company Elastomeric laminate with soft noncrimped spunbond fiber webs
US11135100B2 (en) 2013-05-03 2021-10-05 The Procter & Gamble Company Absorbent articles comprising stretch laminates
US11446186B2 (en) 2016-08-12 2022-09-20 The Procter & Gamble Company Absorbent article with ear portion
US11642248B2 (en) 2016-08-12 2023-05-09 The Procter & Gamble Company Absorbent article with an ear portion
US11944522B2 (en) 2019-07-01 2024-04-02 The Procter & Gamble Company Absorbent article with ear portion

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20131031A1 (en) 2013-12-17 2014-03-18 Fameccanica Data Spa PROCEDURE AND APPARATUS FOR THE TRANSVERSAL WELDING OF OVERLAPPED ELASTIC STRUCTURES

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704116A (en) 1984-07-02 1987-11-03 Kimberly-Clark Corporation Diapers with elasticized side pockets
EP1013251A1 (en) 1998-05-29 2000-06-28 Toyo Eizai Kabushiki Kaisha Disposable underpants and method of continuous manufacturing them
WO2011013823A1 (en) * 2009-07-31 2011-02-03 ユニ・チャーム株式会社 Web joining device and web joining method
WO2011013822A1 (en) * 2009-07-31 2011-02-03 ユニ・チャーム株式会社 Web conveying device and web conveying method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704116A (en) 1984-07-02 1987-11-03 Kimberly-Clark Corporation Diapers with elasticized side pockets
US4704116B1 (en) 1984-07-02 2000-10-17 Kimberly Clark Co Diapers with elasticized side pockets
EP1013251A1 (en) 1998-05-29 2000-06-28 Toyo Eizai Kabushiki Kaisha Disposable underpants and method of continuous manufacturing them
WO2011013823A1 (en) * 2009-07-31 2011-02-03 ユニ・チャーム株式会社 Web joining device and web joining method
WO2011013822A1 (en) * 2009-07-31 2011-02-03 ユニ・チャーム株式会社 Web conveying device and web conveying method

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* Cited by examiner, † Cited by third party
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US11590033B2 (en) 2013-05-03 2023-02-28 The Procter & Gamble Company Absorbent articles comprising stretch laminates
US11179278B2 (en) 2013-05-03 2021-11-23 The Procter & Gamble Company Absorbent articles comprising stretch laminates
US11331223B2 (en) 2016-08-12 2022-05-17 The Procter & Gamble Company Methods and apparatuses for assembling elastic laminates with different bond densities for absorbent articles
US11446186B2 (en) 2016-08-12 2022-09-20 The Procter & Gamble Company Absorbent article with ear portion
US10966876B2 (en) 2016-08-12 2021-04-06 The Procter & Gamble Company Methods and apparatuses for assembling elastic laminates with different bond densities for absorbent articles
US11071654B2 (en) 2016-08-12 2021-07-27 The Procter & Gamble Company Method and apparatus for assembling absorbent articles
US11083633B2 (en) 2016-08-12 2021-08-10 The Procter & Gamble Company Elastic laminates and methods for assembling elastic laminates for absorbent articles
US11877914B2 (en) 2016-08-12 2024-01-23 The Procter & Gamble Company Method and apparatus for assembling absorbent articles
US10568775B2 (en) 2016-08-12 2020-02-25 The Procter & Gamble Company Method and apparatus for assembling absorbent articles
US11266543B2 (en) 2016-08-12 2022-03-08 The Procter & Gamble Company Methods and apparatuses for assembling elastic laminates with different bond densities for absorbent articles
US11872113B2 (en) 2016-08-12 2024-01-16 The Procter & Gamble Company Method and apparatus for assembling absorbent articles
US11642250B2 (en) 2016-08-12 2023-05-09 The Procter & Gamble Company Method and apparatus for assembling absorbent articles
US11382798B2 (en) 2016-08-12 2022-07-12 The Procter & Gamble Company Method and apparatus for assembling absorbent articles
US10959887B2 (en) 2016-08-12 2021-03-30 The Procter & Gamble Company Method and apparatus for assembling absorbent articles
US10561537B2 (en) 2016-08-12 2020-02-18 The Procter & Gamble Company Elastic laminates and methods for assembling elastic laminates for absorbent articles
US11596557B2 (en) 2016-08-12 2023-03-07 The Procter & Gamble Company Method and apparatus for assembling absorbent articles
US11617687B2 (en) 2016-08-12 2023-04-04 The Procter & Gamble Company Methods and apparatuses for assembling elastic laminates with different bond densities for absorbent articles
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US11833018B2 (en) 2017-03-27 2023-12-05 The Procter & Gamble Company Elastomeric laminate with soft noncrimped spunbond fiber webs
US11278458B2 (en) 2017-03-27 2022-03-22 The Procter & Gamble Company Crimped fiber spunbond nonwoven webs/laminates
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DE102017207226A1 (en) * 2017-04-28 2018-10-31 Robert Bosch Gmbh Device for sealing a packaging material web
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