EP1829997A2 - Drum for an installation for the manufacture of a nonwoven, method of manufacture and nonwoven obtained - Google Patents

Drum for an installation for the manufacture of a nonwoven, method of manufacture and nonwoven obtained Download PDF

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Publication number
EP1829997A2
EP1829997A2 EP07008823A EP07008823A EP1829997A2 EP 1829997 A2 EP1829997 A2 EP 1829997A2 EP 07008823 A EP07008823 A EP 07008823A EP 07008823 A EP07008823 A EP 07008823A EP 1829997 A2 EP1829997 A2 EP 1829997A2
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EP
European Patent Office
Prior art keywords
drum
conveyor
compartment
nonwoven
manufacture
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Legal status (The legal status 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 status listed.)
Granted
Application number
EP07008823A
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German (de)
French (fr)
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EP1829997B1 (en
EP1829997A3 (en
Inventor
Frédéric NOELLE
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Andritz Perfojet SAS
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Rieter Perfojet SAS
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Publication of EP1829997A3 publication Critical patent/EP1829997A3/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H18/00—Needling machines
    • D04H18/04—Needling machines with water jets
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00—Other non-woven fabrics
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet

Definitions

  • the present invention relates to nonwoven webs and their processes and production facilities.
  • the patent US 6,321,425 discloses a method of manufacturing a nonwoven web which consists in sending a web, resulting from a spunbond tower which normally comprises successively from top to bottom a generator of a curtain of filaments, in particular of plastic filaments, a an attenuator device with a curtain filament stretching slot a diffuser and a filament receiving conveyor, a calender which consolidates the formed web blank, and a water jet entanglement drum.
  • This method has the disadvantage of altering the uniformity of the formation of the sheet and of orienting the filaments preferably in the machine direction by the stretching which is applied thereto.
  • the invention overcomes this disadvantage by making it possible to obtain a nonwoven web whose properties are substantially isotropic, that is to say substantially identical whether in the machine direction or in the cross direction. It makes it possible not to disturb the removal of the filaments by a large conveyor whose mesh is blocked by water and to protect it from the corrosive action of the water.
  • a drum comprising a fixed cylindrical body with perforated lateral surface surrounded by a perforated sleeve driven in rotation relative to the axis of the cylindrical body, and means intended to create a depression inside. from the body.
  • a watertight partition divides the interior of the body into two compartments delimited by the partition and respectively a first and a second portion of the lateral surface and both of which are depressed by the means intended to create them.
  • the first compartment of the drum makes it possible to bring onto the drum a blank of web lying on an associated conveyor, substantially tangent to the drum at a so-called contact point (this is the point where the conveyor and the drum are closest to the drum). one of the other without touching), even if this draft of a tablecloth is still weak, as it is the case when it comes to the tablecloth coming from a spunbound tower, without needing to prior to calender the draft tablecloth or subject him to other operations involving stretching which permanently undermine the isotropy of the properties of the nonwoven web finally obtained.
  • the first compartment begins opposite the point of contact of the conveyor tangent to the drum and ends opposite a point of the lateral surface downstream, in the direction of rotation of the sleeve, the point of contact.
  • the ply blank has thus been applied to the drum by the depression prevailing in the first compartment, it is subjected to entanglement by jets of water.
  • the first compartment extends over a cylindrical sector of the defined body, in the cross-sectional view of the cylindrical body, substantially by two rays perpendicular to each other, the first compartment occupying substantially the quarter of the interior. from the body.
  • the cylindrical sector occupied by the first compartment is disposed in the second dial between three and six hours.
  • each compartment has its own means of creating a depression and, preferably, the depression is further in the first compartment than in the first compartment. the second.
  • a depression of between 30 and 400 mbar may be created and in the second compartment a depression of between 30 and 300 mbar.
  • the ratio of the total area of the perforations, per unit area, to the area of the lateral surface where they are, is greater for the first compartment. only for the second. This ratio can be for the first compartment between 5% and 30%, while for the second compartment it is between 2% and 15%.
  • the perforations of the lateral surface facing the second compartment are in particular slots facing the pressurized water injectors on the part of the sleeve which passes just opposite the part of the lateral surface of the second compartment.
  • the pressure of the jets is generally between 30 and 400 bars and the diameter of each jet between 75 and 200 microns.
  • a rigid rotary perforated cylinder is mounted outside the fixed cylindrical body and its inside diameter is adjusted to the outer diameter of the cylindrical body so that the minimum clearance thus preserved allows rotation while minimizing air leakage. According to the technical solution adopted for the manufacture of this rotary cylinder, it is envisaged to use spring-mounted plastic battens to improve the tightness of the separation of the two compartments.
  • This rotary cylinder can be a simple perforated plate, a cylinder made of bronze or stainless steel drilled with holes arranged in a helix, a honeycomb cylinder. It may be a rolled perforated sheet metal tube coated with a coarse metal fabric drainage sleeve that provides good uniformity of water extraction. This rotating cylinder supports a thinner perforated sleeve that effectively supports the filaments and fibers of the nonwoven during hydraulic entanglement.
  • the distribution of the holes in the sleeve can be random.
  • the holes can also be arranged aligned or staggered.
  • the holes of the sleeve may also be distributed in small areas of ordered perforations distributed randomly on the surface of the sleeve.
  • the sleeve may be made of a metal fabric or synthetic material or a mixture of metal fabric and synthetic material. It is preferred that the diameter of the holes of the sleeve be between 50 and 500 microns. In order to obtain patterns on the sheet, provision may also be made to thread a perforated sheath onto the sleeve, the openings of which have at least a dimension greater than 2 mm.
  • the invention also relates to an installation for producing a nonwoven web comprising a spunbond conveyor tower leading to a drum according to the invention.
  • the conveyor of the tower and the conveyor tangent to the drum are one and the same conveyor, but it is also possible to provide two separate conveyors.
  • the drum is mounted directly downstream of the tower.
  • directly downstream is meant herein without interposition of a device causing the stretching of the web. So there is no grille, but there may be a compactor roller.
  • the invention also relates to a method for producing a nonwoven web, which consists in using an installation according to the invention, and in adjusting the speed of the conveyor of the tower or the tangent conveyor to a value greater than the linear speed. of the drum (counted on the periphery of the drum).
  • a nonwoven web is thus obtained whose ratio of the breaking strength in the machine direction to that in the cross direction may be less than 1 because of this difference in speed.
  • the speeds are substantially the same one can obtain a ratio of the resistance to the breaking in the machine direction to that in the cross direction of the nonwoven web according to the invention less than 1.2 and especially about 1, so that the nonwoven web according to the invention is particularly well isotropic.
  • the drum shown schematically in Figure 1 comprises an inner body 1 consisting of a fixed cylinder with a diameter of 400 mm and a sheet forming the lateral surface.
  • the lateral surface is perforated with perforations with a diameter of 8 mm in a portion which will delimit what will be called later the first compartment and the lateral surface is pierced with several slots especially in the vicinity of the injectors in a part that will delimit what The second compartment will be called later.
  • the ratio (void ratio) of the sum of the areas of the perforations to the total area of the lateral surface is between 5% and 30% in the first compartment and between 2% and 15% in the second compartment.
  • a perforated rotary cylinder 4 is threaded onto the body 1 and is rotated by a belt drive device 2.
  • the cylinder 4 is holed.
  • the ratio of the sum of the areas of the holes to the area of the total lateral surface of the cylinder 4 is between 30% and 90% and preferably between 40% and 80%.
  • the cylinder 4 has a thickness of between 1.5 and 30 mm and is generally made of stainless steel or bronze.
  • a sleeve 5 is threaded onto the rotary cylinder 4.
  • the ratio of the sum of the areas of the holes to the total lateral surface area of the sleeve 5 is between 5% and 20% and preferably between 5% and 15%.
  • the sleeve 5 is obtained by electrodeposition of nickel. It is microperforated with holes of diameter ranging from 50 to 500 microns and preferably between 200 and 400 microns.
  • the interior of the drum 1 communicates with a pipe 7 for extracting air and water.
  • Two injectors 8 and 9 respectively send according to the generatrices of the body 1 jets of water towards the sleeve 5.
  • Figure 2 is a perspective view illustrating better an embodiment of the drum. It is constituted by the inner cylinder 1 axis O which is split and the sheet forming the lateral surface along two slots 11 arranged between spacers 12 and being in the dial of 1 to 3 hours.
  • a partition consisting of two sheets 13,14 together forming a cylinder sector.
  • the two sheets 13,14 extend in a cross-sectional view perpendicular to the axis O substantially two radii. They are waterproof. They delimit between them with the part 15 of the lateral surface between 3h and 6h a first compartment 16 while the partition 13,14 delimits with the rest of the body 1 a second compartment 17 into which open the slots 11.
  • Rows of holes 18 formed on the portion 15 of the side surface opens into the first compartment 16.
  • the first compartment 16 is connected to means for putting it in depression. They are of the same type as the conduit 7, but are distinct.
  • the void fraction of part 15 is 16%. It is larger than that corresponding to the slots 11.
  • the first compartment also comprises a not shown slot, placed at 6 o'clock facing the point of tangency of the conveyor carrying the nonwoven blank with the cylinder. This slot is intended to facilitate the transfer of the filament web on the portion of the cylinder facing the first compartment.
  • FIG. 3 The embodiment shown in Figure 3 is identical to that of Figure 2, except that the rows of holes 18 of the portion 15 are replaced by slots 19 which are not parallel to the axis O.
  • the installation shown in Figure 4 comprises a spunbond 21 conveyor tower 22 leading, optionally with a pressure roller 23, to a drum 24 according to the invention of the main application.
  • the conveyor 22 is tangent to the drum 24 at the lowest point thereof.
  • One of the water injectors is angularly disposed immediately adjacent the first compartment 26, which means that one of the radial walls defining the second compartment 26 is in a position corresponding substantially to 4 o'clock while the first injector 25 is in a position just before 4 o'clock.
  • the tablecloth nonwoven which is deposited on the conveyor 22 is sucked on the drum 24 thanks to the suction provided by the first compartment 26, is entangled hydraulically by the injectors 25 and leaves the drum 24 to pass on a conveyor 27 inclined before to enter a furnace 28, then out to wind on a winder 29.
  • a spunbond tower 31 is again recognized, which deposits a blank of nonwoven web 32, which is taken by a first drum 33 according to the invention of the main request having an injector 34 and which is sent by a conveyor 35 to a second drum 36 according to the invention of the main application.
  • FIG. 6 a variant of FIG. 4 is recognized on which the filament web is transferred to additional drums 41 and 42 to provide additional consolidation and patterns prior to entering the through-air drying oven.

Abstract

For the production of a nonwoven, spunbond filaments are fed (21) to a conveyor (22) to a perforated drum (24). The interior (26) of the drum is at an underpressure. Water injectors (25) spray water at the material around the drum surface, and is extracted by the inner suction.

Description

La présente invention se rapporte aux nappes non-tissées et à leur procédés et installations de production.The present invention relates to nonwoven webs and their processes and production facilities.

Le brevet US 6,321,425 décrit un procédé de fabrication d'une nappe non-tissées qui consiste à envoyer une nappe, issue d'une tour spunbond qui comprend normalement successivement de haut en bas un générateur d'un rideau de filaments, notamment de filaments en matière plastique, un dispositif alténuateur à fente d'étirage des filaments du rideau un diffuseur et un convoyeur de réception des filaments, à une calandre qui consolide l'ébauche de nappe formée, puis à un tambour d'enchevêtrement par jets d'eau. Ce procédé a l'inconvénient d'altérer l'uniformité de la formation de la nappe et d'orienter les filaments préférentiellement dans le sens machine par l'étirage qui est appliqué à celle-ci.The patent US 6,321,425 discloses a method of manufacturing a nonwoven web which consists in sending a web, resulting from a spunbond tower which normally comprises successively from top to bottom a generator of a curtain of filaments, in particular of plastic filaments, a an attenuator device with a curtain filament stretching slot a diffuser and a filament receiving conveyor, a calender which consolidates the formed web blank, and a water jet entanglement drum. This method has the disadvantage of altering the uniformity of the formation of the sheet and of orienting the filaments preferably in the machine direction by the stretching which is applied thereto.

L'invention remédie à cet inconvénient en permettant d'obtenir une nappe non tissée dont les propriétés sont sensiblement isotropes, c'est-à-dire sensiblement identiques que ce soit dans le sens machine ou dans le sens travers. Elle permet de ne pas perturber la dépose des filaments par un convoyeur de grande dimension dont les mailles sont bouchées par de l'eau et de le protéger de l'action corrosive de l'eau.The invention overcomes this disadvantage by making it possible to obtain a nonwoven web whose properties are substantially isotropic, that is to say substantially identical whether in the machine direction or in the cross direction. It makes it possible not to disturb the removal of the filaments by a large conveyor whose mesh is blocked by water and to protect it from the corrosive action of the water.

On y parvient par l'invention définie à la revendication 1. Des perfectionnements apparaissent dans les sous-revendications. Dans l'invention, on peut utiliser un tambour comportant un corps cylindrique fixe à surface latérale perforée entouré d'un manchon troué entraîné en rotation par rapport à l'axe du corps cylindrique, et des moyens destinés à créer une dépression à l'intérieur du corps. Une cloison imperméable à l'eau subdivise l'intérieur du corps en deux compartiments délimités par la cloison et par respectivement une première et une seconde partie de la surface latérale et mis tous deux en dépression par les moyens destinés à en créer.This is achieved by the invention as defined in claim 1. Advances appear in the subclaims. In the invention, it is possible to use a drum comprising a fixed cylindrical body with perforated lateral surface surrounded by a perforated sleeve driven in rotation relative to the axis of the cylindrical body, and means intended to create a depression inside. from the body. A watertight partition divides the interior of the body into two compartments delimited by the partition and respectively a first and a second portion of the lateral surface and both of which are depressed by the means intended to create them.

Le premier compartiment du tambour permet de faire venir sur le tambour une ébauche de nappe se trouvant sur un convoyeur associé, sensiblement tangent au tambour en un point dit de contact (c'est le point où le convoyeur et le tambour sont le plus près l'un de l'autre sans pour autant se toucher), même si cette ébauche de nappe est encore peu consolidée, comme c'est le cas lorsqu'il s'agit de la nappe venant d'une tour spunbound, sans avoir besoin au préalable de calandrer l'ébauche de nappe ou de lui faire subir d'autres opérations impliquant un étirage qui portent définitivement atteinte à l'isotropie des propriétés de la nappe non-tissée finalement obtenue.The first compartment of the drum makes it possible to bring onto the drum a blank of web lying on an associated conveyor, substantially tangent to the drum at a so-called contact point (this is the point where the conveyor and the drum are closest to the drum). one of the other without touching), even if this draft of a tablecloth is still weak, as it is the case when it comes to the tablecloth coming from a spunbound tower, without needing to prior to calender the draft tablecloth or subject him to other operations involving stretching which permanently undermine the isotropy of the properties of the nonwoven web finally obtained.

De préférence, le premier compartiment débute en regard du point de contact du convoyeur tangent au tambour et se termine en regard d'un point de la surface latérale en aval, dans le sens de rotation du manchon, du point de contact. Dès que l'ébauche de nappe a été ainsi appliquée au tambour par la dépression régnant dans le premier compartiment, elle est soumise à l'enchevêtrement par jets d'eau.Preferably, the first compartment begins opposite the point of contact of the conveyor tangent to the drum and ends opposite a point of the lateral surface downstream, in the direction of rotation of the sleeve, the point of contact. As soon as the ply blank has thus been applied to the drum by the depression prevailing in the first compartment, it is subjected to entanglement by jets of water.

Suivant un mode de réalisation, le premier compartiment s'étend sur un secteur cylindrique du corps défini, dans la vue en coupe transversale du corps cylindrique, sensiblement par deux rayons perpendiculaires entre eux, le premier compartiment occupant sensiblement ainsi le quart de l'intérieur du corps. De préférence, le secteur cylindrique occupé par le premier compartiment est disposé dans le deuxième cadran entre trois et six heures.According to one embodiment, the first compartment extends over a cylindrical sector of the defined body, in the cross-sectional view of the cylindrical body, substantially by two rays perpendicular to each other, the first compartment occupying substantially the quarter of the interior. from the body. Preferably, the cylindrical sector occupied by the first compartment is disposed in the second dial between three and six hours.

Les moyens destinés à créer une dépression peuvent être communs aux deux compartiments mais, suivant un mode de réalisation préféré, chaque compartiment a son propre moyen de création d'une dépression et, de préférence, la dépression est plus poussée dans le premier compartiment que dans le second. On peut créer notamment dans le premier compartiment une dépression comprise entre 30 et 400 mbars et dans le second compartiment une dépression comprise entre 30 et 300 mbars.The means for creating a depression may be common to both compartments but, according to a preferred embodiment, each compartment has its own means of creating a depression and, preferably, the depression is further in the first compartment than in the first compartment. the second. In particular, in the first compartment a depression of between 30 and 400 mbar may be created and in the second compartment a depression of between 30 and 300 mbar.

Pour que le tambour puisse bien prendre l'ébauche de nappe, il vaut mieux que le rapport de la superficie totale des perforations, par unité de surface, à la superficie de la surface latérale où elles se trouvent, soit plus grand pour le premier compartiment que pour le second. Ce rapport peut être pour le premier compartiment compris entre 5% et 30%, tandis que pour le second compartiment il est compris entre 2% et 15%.In order for the drum to take up the blank, it is better that the ratio of the total area of the perforations, per unit area, to the area of the lateral surface where they are, is greater for the first compartment. only for the second. This ratio can be for the first compartment between 5% and 30%, while for the second compartment it is between 2% and 15%.

Les perforations de la surface latérale en regard du second compartiment sont notamment des fentes qui se trouvent en regard d'injecteurs d'eau sous pression sur la partie du manchon qui passe justement en regard de la partie de la surface latérale du second compartiment. La pression des jets est en général comprise entre 30 et 400 bars et le diamètre de chaque jet entre 75 et 200 microns. Un cylindre perforé rotatif rigide est monté à l'extérieur du corps cylindrique fixe et son diamètre intérieur est ajusté au diamètre extérieur du corps cylindrique pour que le jeu minimum ainsi conservé permette la rotation tout en minimisant les fuites d'air. Suivant la solution technique retenue pour la fabrication de ce cylindre rotatif, il est envisagé d'utiliser des liteaux plastiques montés sur ressorts pour améliorer l'étanchéité de la séparation des deux compartiments. Ce cylindre rotatif peut être une simple tôle perforée, un cylindre en bronze ou en acier inoxydable percé de trous disposés en hélice, un cylindre en nid d'abeille. Ce peut être un tube en tôle perforée roulé revêtu d'un manchon de drainage en tissu métallique grossier qui assure une bonne uniformité d'extraction de l'eau. Ce cylindre rotatif supporte un manchon perforé plus fin qui supporte effectivement les filaments et les fibres du non tissé lors de l'enchevêtrement hydraulique. La répartition des trous dans le manchon peut être aléatoire. Les trous peuvent être aussi ordonnés en étant alignés ou en quinconce. Les trous du manchon peuvent aussi être répartis dans des petites zones de perforations ordonnées réparties de manière aléatoire à la surface du manchon. Le manchon peut être constitué d'un tissu métallique ou en matière synthétique ou en mélange de tissu métallique et de matière synthétique. On préfère que le diamètre des trous du manchon soit compris entre 50 et 500 microns. On peut prévoir, pour obtenir des motifs sur la nappe, aussi d'enfiler une gaine ajourée sur le manchon dont les ajours ont au moins une dimension supérieure à 2 mm.The perforations of the lateral surface facing the second compartment are in particular slots facing the pressurized water injectors on the part of the sleeve which passes just opposite the part of the lateral surface of the second compartment. The pressure of the jets is generally between 30 and 400 bars and the diameter of each jet between 75 and 200 microns. A rigid rotary perforated cylinder is mounted outside the fixed cylindrical body and its inside diameter is adjusted to the outer diameter of the cylindrical body so that the minimum clearance thus preserved allows rotation while minimizing air leakage. According to the technical solution adopted for the manufacture of this rotary cylinder, it is envisaged to use spring-mounted plastic battens to improve the tightness of the separation of the two compartments. This rotary cylinder can be a simple perforated plate, a cylinder made of bronze or stainless steel drilled with holes arranged in a helix, a honeycomb cylinder. It may be a rolled perforated sheet metal tube coated with a coarse metal fabric drainage sleeve that provides good uniformity of water extraction. This rotating cylinder supports a thinner perforated sleeve that effectively supports the filaments and fibers of the nonwoven during hydraulic entanglement. The distribution of the holes in the sleeve can be random. The holes can also be arranged aligned or staggered. The holes of the sleeve may also be distributed in small areas of ordered perforations distributed randomly on the surface of the sleeve. The sleeve may be made of a metal fabric or synthetic material or a mixture of metal fabric and synthetic material. It is preferred that the diameter of the holes of the sleeve be between 50 and 500 microns. In order to obtain patterns on the sheet, provision may also be made to thread a perforated sheath onto the sleeve, the openings of which have at least a dimension greater than 2 mm.

L'invention vise également une installation de production d'une nappe non-tissée comprenant une tour spunbond à convoyeur menant à un tambour suivant l'invention. De préférence, le convoyeur de la tour et le convoyeur tangent au tambour sont un seul et même convoyeur, mais il est possible aussi de prévoir deux convoyeurs distincts.The invention also relates to an installation for producing a nonwoven web comprising a spunbond conveyor tower leading to a drum according to the invention. Preferably, the conveyor of the tower and the conveyor tangent to the drum are one and the same conveyor, but it is also possible to provide two separate conveyors.

Suivant un mode de réalisation particulièrement préféré, le tambour est monté directement en aval de la tour. Par directement en aval, on entend, dans le présent mémoire, sans interposition d'un dispositif provoquant l'étirage de la nappe. Il y a donc pas de calandre, mais il peut y avoir un rouleau compacteur.According to a particularly preferred embodiment, the drum is mounted directly downstream of the tower. By directly downstream, is meant herein without interposition of a device causing the stretching of the web. So there is no grille, but there may be a compactor roller.

L'invention vise aussi un procédé de production d'une nappe non-tissée, qui consiste à utiliser une installation suivant l'invention, et à régler la vitesse du convoyeur de la tour ou du convoyeur tangent à une valeur supérieure à la vitesse linéaire du tambour (décomptée sur le pourtour du tambour). On obtient ainsi une nappe non-tissée dont le rapport de la résistance à la rupture dans le sens machine à celle dans le sens travers peut être inférieur à 1 en raison de cette différence de vitesse. Lorsque les vitesses sont sensiblement les mêmes on peut obtenir un rapport de la résistance à la rupture dans le sens machine à celle dans le sens travers de la nappe non-tissée suivant l'invention inférieure à 1,2 et notamment d'environ 1, en sorte que la nappe non-tissée suivant l'invention est particulièrement bien isotrope.The invention also relates to a method for producing a nonwoven web, which consists in using an installation according to the invention, and in adjusting the speed of the conveyor of the tower or the tangent conveyor to a value greater than the linear speed. of the drum (counted on the periphery of the drum). A nonwoven web is thus obtained whose ratio of the breaking strength in the machine direction to that in the cross direction may be less than 1 because of this difference in speed. When the speeds are substantially the same one can obtain a ratio of the resistance to the breaking in the machine direction to that in the cross direction of the nonwoven web according to the invention less than 1.2 and especially about 1, so that the nonwoven web according to the invention is particularly well isotropic.

Aux dessins annexés, donnés à titre d'exemple :

  • la figure 1 est une vue en perspective avec arrachement d'une installation de production de non-tissé
  • la figure 2 et la figure 3 sont deux vues en perspective avec arrachement d'un tambour,
  • les figures 4 et la figure 5 sont deux vues schématiques de deux variantes d'installation, tandis que
  • la figure 5 est une vue schématique d'une installation suivant l'invention.
In the accompanying drawings, given by way of example:
  • FIG. 1 is a cutaway perspective view of a nonwoven production facility.
  • FIG. 2 and FIG. 3 are two perspective views with tearing of a drum,
  • FIGS. 4 and 5 are two schematic views of two installation variants, while
  • Figure 5 is a schematic view of an installation according to the invention.

Le tambour représenté schématiquement à la figure 1 comprend un corps 1 intérieur composé d'un cylindre fixe d'un diamètre de 400 mm et d'une tôle formant la surface latérale. La surface latérale est perforée de perforations d'un diamètre de 8 mm dans une partie qui délimitera ce que l'on appellera ultérieurement le premier compartiment et la surface latérale est percée de plusieurs fentes notamment en regards des injecteurs dans une partie qui délimitera ce qu'on appellera ultérieurement le second compartiment. Le rapport (taux de vide) de la somme des superficies des perforations à la superficie totale de la surface latérale est compris entre 5% et 30% dans le premier compartiment et entre 2% et 15% dans le second compartiment. Un cylindre rotatif perforé 4 est enfilé sur le corps 1 et est entraîné en rotation par un dispositif 2 d'entraînement à courroies. Le cylindre 4 est troué. Le rapport de la somme des superficies des trous à la superficie de la surface latérale totale du cylindre 4 est compris entre 30% et 90% et de préférence entre 40% et 80%. Le cylindre 4 a une épaisseur comprise entre 1,5 et 30 mm et est généralement en acier inoxydable ou en bronze. Un manchon 5 est enfilé sur le cylindre rotatif 4. Le rapport de la somme des superficies des trous a la superficie de surface latérale totale du manchon 5 est compris entre 5% et 20% et de préférence entre 5% et 15%. Le manchon 5 est obtenu par électrodéposition de nickel. Il est microperforé de trous de diamètre allant de 50 à 500 microns et de préférence compris entre 200 et 400 microns. Il a une épaisseur comprise entre 0,1 et 0,6 mm et de préférence comprise entre 0,2 et 0,4 mm. L'intérieur du tambour 1 communique avec un tuyau 7 d'extraction de l'air et de l'eau. Deux injecteurs 8 et 9 envoient respectivement suivant des génératrices du corps 1 des jets d'eau en direction du manchon 5.The drum shown schematically in Figure 1 comprises an inner body 1 consisting of a fixed cylinder with a diameter of 400 mm and a sheet forming the lateral surface. The lateral surface is perforated with perforations with a diameter of 8 mm in a portion which will delimit what will be called later the first compartment and the lateral surface is pierced with several slots especially in the vicinity of the injectors in a part that will delimit what The second compartment will be called later. The ratio (void ratio) of the sum of the areas of the perforations to the total area of the lateral surface is between 5% and 30% in the first compartment and between 2% and 15% in the second compartment. A perforated rotary cylinder 4 is threaded onto the body 1 and is rotated by a belt drive device 2. The cylinder 4 is holed. The ratio of the sum of the areas of the holes to the area of the total lateral surface of the cylinder 4 is between 30% and 90% and preferably between 40% and 80%. The cylinder 4 has a thickness of between 1.5 and 30 mm and is generally made of stainless steel or bronze. A sleeve 5 is threaded onto the rotary cylinder 4. The ratio of the sum of the areas of the holes to the total lateral surface area of the sleeve 5 is between 5% and 20% and preferably between 5% and 15%. The sleeve 5 is obtained by electrodeposition of nickel. It is microperforated with holes of diameter ranging from 50 to 500 microns and preferably between 200 and 400 microns. It has a thickness of between 0.1 and 0.6 mm and preferably between 0.2 and 0.4 mm. The interior of the drum 1 communicates with a pipe 7 for extracting air and water. Two injectors 8 and 9 respectively send according to the generatrices of the body 1 jets of water towards the sleeve 5.

La figure 2 est une vue en perspective illustrant mieux un mode de réalisation du tambour. Il est constitué par le cylindre 1 intérieur d'axe O qui est fendu ainsi que la tôle formant la surface latérale suivant deux fentes 11 disposées entre des entretoises 12 et se trouvant dans le cadran de 1 à 3 h. Dans le cadran de 3h à 6h est ménagée une cloison constituée de deux tôles 13,14 formant ensemble un secteur de cylindre. Les deux tôles 13,14 s'étendent suivant une vue en coupe transversale perpendiculaire à l'axe O suivant sensiblement deux rayons. Elles sont imperméables à l'eau. Elles délimitent entre elles avec la partie 15 de la surface latérale se trouvant entre 3h et 6h un premier compartiment 16 tandis que la cloison 13,14 délimite avec le reste du corps 1 un second compartiment 17 dans lequel débouchent les fentes 11. Des rangées de trous 18 ménagées sur la partie 15 de la surface latérale débouche dans le premier compartiment 16. Le premier compartiment 16 est relié à des moyens permettant de le mettre en dépression. Ils sont du même type que le conduit 7, mais en sont distincts. Le taux de vide de la partie 15 est de 16%. Il est plus grand que celui correspondant aux fentes 11. Dans une variante, le premier compartiment comprend aussi une fente non représenté, placée à 6h en regards du point de tangence du convoyeur transportant l'ébauche de non tissé avec le cylindre. Cette fente a pour but de faciliter le transfert de la nappe de filaments sur la portion du cylindre en vis à vis du premier compartiment.Figure 2 is a perspective view illustrating better an embodiment of the drum. It is constituted by the inner cylinder 1 axis O which is split and the sheet forming the lateral surface along two slots 11 arranged between spacers 12 and being in the dial of 1 to 3 hours. In the dial from 3h to 6h is formed a partition consisting of two sheets 13,14 together forming a cylinder sector. The two sheets 13,14 extend in a cross-sectional view perpendicular to the axis O substantially two radii. They are waterproof. They delimit between them with the part 15 of the lateral surface between 3h and 6h a first compartment 16 while the partition 13,14 delimits with the rest of the body 1 a second compartment 17 into which open the slots 11. Rows of holes 18 formed on the portion 15 of the side surface opens into the first compartment 16. The first compartment 16 is connected to means for putting it in depression. They are of the same type as the conduit 7, but are distinct. The void fraction of part 15 is 16%. It is larger than that corresponding to the slots 11. In a variant, the first compartment also comprises a not shown slot, placed at 6 o'clock facing the point of tangency of the conveyor carrying the nonwoven blank with the cylinder. This slot is intended to facilitate the transfer of the filament web on the portion of the cylinder facing the first compartment.

Le mode de réalisation représenté à la figure 3 est identique à celui de la figure 2, si ce n'est que les rangées de trous 18 de la partie 15 sont remplacées par des fentes 19 qui ne sont pas parallèles à l'axe O.The embodiment shown in Figure 3 is identical to that of Figure 2, except that the rows of holes 18 of the portion 15 are replaced by slots 19 which are not parallel to the axis O.

L'installation représentée à la figure 4 comprend une tour 21 spunbond à convoyeur 22 menant, avec éventuellement interposition d'un rouleau 23 presseur, à un tambour 24 suivant l'invention de la demande principale. Le convoyeur 22 est tangent au tambour 24 au point le plus bas de celui-ci. Il est prévu deux injecteurs 25 d'eau en regard de la partie de la surface latérale du second compartiment. L'un des injecteurs 25 d'eau est disposé angulairement de manière immédiatement adjacente au premier compartiment 26, ce qui signifie que l'une des parois radiales définissant le second compartiment 26 se trouve en une position correspondant sensiblement à 4h tandis que le premier injecteur 25 se trouve en une position un peu avant 4h. L'ébauche de nappe non-tissée qui se dépose sur le convoyeur 22 est aspirée sur le tambour 24 grâce à l'aspiration fournie par le premier compartiment 26, est enchevêtrée par voie hydraulique par les injecteurs 25 et quitte le tambour 24 pour passer sur un convoyeur 27 incliné avant d'entrer dans un four 28, puis d'en sortir pour s'enrouler sur un enrouleur 29.The installation shown in Figure 4 comprises a spunbond 21 conveyor tower 22 leading, optionally with a pressure roller 23, to a drum 24 according to the invention of the main application. The conveyor 22 is tangent to the drum 24 at the lowest point thereof. There are two water injectors facing the part of the lateral surface of the second compartment. One of the water injectors is angularly disposed immediately adjacent the first compartment 26, which means that one of the radial walls defining the second compartment 26 is in a position corresponding substantially to 4 o'clock while the first injector 25 is in a position just before 4 o'clock. The tablecloth nonwoven which is deposited on the conveyor 22 is sucked on the drum 24 thanks to the suction provided by the first compartment 26, is entangled hydraulically by the injectors 25 and leaves the drum 24 to pass on a conveyor 27 inclined before to enter a furnace 28, then out to wind on a winder 29.

A la figure 5, on reconnaît à nouveau une tour spunbond 31 qui dépose une ébauche de nappe 32 non-tissée, qui est prise par un premier tambour 33 suivant l'invention de la demande principale ayant un injecteur 34 et qui est envoyé par un convoyeur 35 à un second tambour 36 suivant l'invention de la demande principale.In FIG. 5, a spunbond tower 31 is again recognized, which deposits a blank of nonwoven web 32, which is taken by a first drum 33 according to the invention of the main request having an injector 34 and which is sent by a conveyor 35 to a second drum 36 according to the invention of the main application.

A la figure 6, on reconnaît une variante de la figure 4 sur laquelle la nappe de filament est transférée à des tambours supplémentaires 41 et 42 pour lui conférer une consolidation supplémentaire et des motifs avant d'entrer dans le four de séchage par air traversant.In FIG. 6, a variant of FIG. 4 is recognized on which the filament web is transferred to additional drums 41 and 42 to provide additional consolidation and patterns prior to entering the through-air drying oven.

Claims (5)

Installation de production de nontissé, comprenant - un premier convoyeur (32) sans fin de transport d'un voile de nontissé, - un tambour (36) d'hydroenchevêtrement du voile, caractérisée en ce que - un deuxième convoyeur (35) sans fin est disposé entre le premier convoyeur (32) et le tambour (36) et est muni d'un dispositif (33) d'aspiration, de manière à faire passer le voile du premier convoyeur (32) au deuxième convoyeur (35), et - le deuxième convoyeur (35) est tangent au tambour (36). Production facility for nonwovens, including - a first conveyor (32) endless transport of a nonwoven web, a drum (36) for hydroentangling the veil, characterized in that a second endless conveyor (35) is arranged between the first conveyor (32) and the drum (36) and is provided with a suction device (33) so as to pass the web of the first conveyor (32); ) at the second conveyor (35), and the second conveyor (35) is tangent to the drum (36). Installation suivant la revendication 1, caractérisée en ce que le tambour (36) est au-dessus du deuxième convoyeur (35) et le premier convoyeur (32) est en dessous du deuxième convoyeur (35).Installation according to claim 1, characterized in that the drum (36) is above the second conveyor (35) and the first conveyor (32) is below the second conveyor (35). Installation suivant la revendication 1 ou 2, caractérisée en ce que la dimension longitudinale suivant l'horizontale du deuxième convoyeur est plus petite que celle du premier convoyeur.Installation according to claim 1 or 2, characterized in that the longitudinal dimension along the horizontal of the second conveyor is smaller than that of the first conveyor. Installation suivant l'une des revendications précédentes, caractérisée en ce que le dispositif (33) d'aspiration du deuxième convoyeur (35) est à l'intérieur de ce convoyeur (35).Installation according to one of the preceding claims, characterized in that the device (33) for suction of the second conveyor (35) is inside this conveyor (35). Installation suivant l'une des revendications précédentes, caractérisée en ce qu'un dispositif d'aspiration est disposé à l'intérieur du tambour (36).Installation according to one of the preceding claims, characterized in that a suction device is arranged inside the drum (36).
EP07008823.2A 2002-04-12 2003-04-08 Drum for an installation for the manufacture of a nonwoven, method of manufacture and nonwoven obtained Expired - Lifetime EP1829997B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0204604A FR2838457B1 (en) 2002-04-12 2002-04-12 DRUM FOR INSTALLATION FOR PRODUCING A NON-WOVEN TABLECLOTH, METHOD FOR PRODUCING A NON-WOVEN TABLECLOTH, AND NON-WOVEN TABLECLOTH OBTAINED
EP03746325A EP1499767B1 (en) 2002-04-12 2003-04-08 Drum for a production unit for a non-woven material, method for production of a non-woven material and non-woven material obtained thus

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EP03746325A Division EP1499767B1 (en) 2002-04-12 2003-04-08 Drum for a production unit for a non-woven material, method for production of a non-woven material and non-woven material obtained thus

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EP1829997A2 true EP1829997A2 (en) 2007-09-05
EP1829997A3 EP1829997A3 (en) 2009-04-08
EP1829997B1 EP1829997B1 (en) 2018-03-28

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EP03746325A Expired - Lifetime EP1499767B1 (en) 2002-04-12 2003-04-08 Drum for a production unit for a non-woven material, method for production of a non-woven material and non-woven material obtained thus

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US (2) US7350279B2 (en)
EP (2) EP1829997B1 (en)
JP (1) JP4313681B2 (en)
CN (1) CN100381625C (en)
AT (1) ATE490358T1 (en)
AU (1) AU2003246794A1 (en)
DE (1) DE60335182D1 (en)
FR (1) FR2838457B1 (en)
IL (1) IL164472A (en)
PL (1) PL207824B1 (en)
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WO (1) WO2003087455A1 (en)

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Also Published As

Publication number Publication date
CN1646752A (en) 2005-07-27
EP1829997B1 (en) 2018-03-28
US7350279B2 (en) 2008-04-01
EP1829997A3 (en) 2009-04-08
PL371286A1 (en) 2005-06-13
JP4313681B2 (en) 2009-08-12
DE60335182D1 (en) 2011-01-13
WO2003087455A1 (en) 2003-10-23
JP2005522596A (en) 2005-07-28
FR2838457A1 (en) 2003-10-17
EP1499767A1 (en) 2005-01-26
IL164472A0 (en) 2005-12-18
ATE490358T1 (en) 2010-12-15
AU2003246794A1 (en) 2003-10-27
US20080066274A1 (en) 2008-03-20
IL164472A (en) 2010-12-30
TR201808600T4 (en) 2018-07-23
EP1499767B1 (en) 2010-12-01
US20050115036A1 (en) 2005-06-02
US7500293B2 (en) 2009-03-10
FR2838457B1 (en) 2004-08-27
PL207824B1 (en) 2011-02-28
CN100381625C (en) 2008-04-16

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