WO2005061643A1 - Thin polyethylene pressure sensitive labels - Google Patents
Thin polyethylene pressure sensitive labels Download PDFInfo
- Publication number
- WO2005061643A1 WO2005061643A1 PCT/FI2004/050197 FI2004050197W WO2005061643A1 WO 2005061643 A1 WO2005061643 A1 WO 2005061643A1 FI 2004050197 W FI2004050197 W FI 2004050197W WO 2005061643 A1 WO2005061643 A1 WO 2005061643A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure sensitive
- sensitive adhesive
- film
- mils
- thickness
- Prior art date
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/241—Polyolefin, e.g.rubber
- C09J7/243—Ethylene or propylene polymers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/08—Fastening or securing by means not forming part of the material of the label itself
- G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/75—Printability
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2519/00—Labels, badges
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/334—Applications of adhesives in processes or use of adhesives in the form of films or foils as a label
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/24992—Density or compression of components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
Definitions
- the present invention relates to a novel very thin laminate construction which may be used for pressure sensitive adhesive labels and a method for making such a laminate construction. More particularly the invention relates to very thin layered constructions, such as sheets of labels, which include thin printable polyethylene facestock releasably bound with a pressure- sensitive adhesive to a thin paper liner.
- Labels are attached to containers for advertisement and appearance.
- labels are applied to substrate containers or goods with high speed equipment.
- High speed equipment transfers the label, or facestock, from a liner release sheet to the substrate container.
- the facestock has been at least 3.4 mils thick.
- the backing or liner material has been paper or a polymeric film such as polyethylene terephthalate. Thicknesses of the liner have varied, but paper liners have been at least 2.2 mils thick and more often at least 2.5 mils thick.
- Ultra thin facestock having thickness a low as 0.7 mils is known when biaxially oriented polypropylene has been used for label facestock material in combination with polyethylene terephthalate (PET) liner material.
- PET polyethylene terephthalate
- Biaxially oriented polypropylene is stiff and even very thin biaxially oriented polypropylene having a thickness as low as 0.5 mils can lend itself to high speed label mounting operations. In these operations the label facestock for very small periods of time hangs in air after the liner, such as a polyethylene terephthalate liner, has been removed from the facestock during application of the label.
- the PET is tough and smooth, and hence, can be relatively thin. PET is smooth and will protect the clarity of polypropylene film. Paper liners are cheaper, but are too rough and put the clarity of polypropylene at risk. The toughness of PET will protect the thin low tensile strength of the polypropylene facestock label.
- Polypropylene film facestock is not without problems. Without a top coating, printing on the film surface scratches and needs to be over- coated with lacquer or layered with another polypropylene to mitigate scratching. Moreover, polypropylene is not readily printable as other films such as polyethylene. While polyethylene needs to be surface treated, such as with a corona treatment, to enhance printability, it is still less costly to corona treat polyethylene for printability than to over-coat polypropylene to mitigate scratching and enhance printability. Moreover, the stiffness of polypropylene works against its use on flexible substrates, such as squeezable bottles, where deformation of the label is important.
- United States Patent Publication 2003/0152722 of Fearn et al. describes thin film facestock labels of 1 mil or less in conjunction with a polyester film release liner.
- This publication refers to the facestock films as polypropylene, polyethylene or PVC, but describes biaxially oriented polypropylene as "exemplary". Even if this polyethylene film is used for facestock, the publication appears to suggest that it should be biaxially oriented (as is the case with polypropylene), to attain sufficient stiffness for the film.
- United States Patent Publication 2001/0030030 of Nandy et al. describes film label stock of polypropylene and polyethylene having a thickness of 2 mils laminated with a polyester release liner.
- polyester liners such as polyethylene terephthalate
- ink as well as biaxially oriented film
- the polyester liners cause as well as solve problems. While they may strengthen the label stock, they also cause static electricity in the label stock which creates materials handling problems.
- ultra thin facestocks also have required over lamination with another film to achieve sufficient durability for labeling operations.
- the invention is directed to an ultra thin pressure sensitive adhesive construction suitable for the high speed application of label mounting equipment, a method of making such labels and a method for applying the labels.
- the labels of the invention include: a polyethylene film having a density of from 0.910 to 0.924 g/cm 3 and a thickness of less than 1.8 mils; a pressure sensitive adhesive on one surface of the film; and a release composition coated paper liner having a thickness of less than 2.2 mils releasaby attached to the pressure sensitive adhesive.
- the invention also is directed to a method for making the construction with vacuum rollers to reduce tension on the thin films during lamination of the facestock with the paper liner.
- the method comprises moving a polyethylene film facestock web having a density of from 0.917 to 0.924 g/cm 3 and a thickness of less than 1.8 mil with at least one vacuum roller downstream to a lamination nip.
- the paper liner web having a thickness of less than 2.2 mils also is moved downstream to the lamination nip.
- a pressure sensitive adhesive is applied onto one surface of the paper liner web to adhesively laminate the film facestock with the adhesive on the paper liner web at the lamination nip to releasably attach the liner web to the facestock film web.
- the pressure sensitive adhesive construction includes polyethylene film having a density of 0.917 to 0.920 g/cm 3 , a thickness of less than 1.8 mils and a paper liner having a thickness of from 1.0 to 2.0 mils. These labels will have a haze of less than 4% as measured by ASTM test D 1003.
- the polyethylene film has a thickness of less than 1.2 mils or in the range of 1.0 to 1.2 mils and the paper liner has a thickness in the range of from 1.0 to 1.8 mils with the film having a haze of not more than 4%.
- the invention advantageously provides a label which not only uses less materials for facestock and liner, the invention provides deformable labels which are mountable on deformable containers and will stay attractive throughout cycles of mechanical stress, temperature change and/or atmospheric exposure without shrinking, wrinkling or otherwise being deleteriously affected by stress and deformation.
- the invention does not require a polymeric film which has a special ratio of stiffness in the cross direction/ machine direction or special ratio of the weight average molecular weight (M MW /M MN ), but such latter molecular weight ratios may exceed 7 and go as high as 10 or more.
- the invention also does not require an oriented polyethylene which may be too stiff for appropriate mounting onto a deformable surface such as a squeeze bottle.
- the label is not only thin, but has the ability to be mounted and adhere to a flexible and deformable surface.
- the surface of the facestock of the polyethylene film is treated or otherwise modified to make the surface more suitable for printing.
- Such a treatment includes corona treatment or print-varnishing.
- the use of a paper liner is important to avoid the static electricity created by polymeric film liners, yet provide the labelstock comprising the facestock and liner with sufficient strength and durability.
- the paper liner used in the invention is a glassine type of paper made from an elementary chlorine free (ECF) pulp (hardwood or softwood), poly vinyl alcohol (PVOH) based surface sizing and internal sizing.
- high refining level of the fibers, surface sizing with poly-vinyl alcohol (PVOH), rewetting before calendering and heavy super calendering produces a dense (at least about 1050 kg/m 3 , preferably about 1090 kg/m 3 or more), strong (a tensile strength of at least about 5kN/m for the MD and at least 2kN/m for the CD, but preferably a tensile strength md/cd 6.5/2.5 k newtons/meter [N/m] or more) and transparent (transparency at least about 50% and preferably 62% or more) uncoated, surface sized, non-filler added paper liner.
- a release coating composition may be applied by siliconizing the surface of the paper.
- the paper may be siliconized by solventless siliconizing, solvent based siliconizing, emulsion siliconizing, UV cured siliconizing, and low temperature curing methods.
- the labels of the invention may be mounted using a labeling machine which utilizes a vacuum belt where the die cut labels are peeled from the liner and moved to a vacuum belt which positions the label at the point of adhering the label to the substrate, such as a substrate container. At the point of dispensing and adhering the label, the vacuum is released and the label is transferred to the substrate.
- the vacuum belt moves continuously and permits use of labels with a lower stiffness whereas machines without a vacuum belt or roller stop and start at very high speeds which demand stiffness and strength in a label. Labeling machines which have a vacuum operation as described are available from Harland Machine Systems, Salford, U.K. Detailed description
- the polyethylene for the facestock of the label should be treated or otherwise modified to enhance the ability of the film to be coated and retain adhesive and printing.
- An indirect coating process may be used to coat the thin paper liner with a suitable release composition such as a silicone or another convention material used for this purpose as is known. Thereafter the coated sheet is passed through a heated oven to cure the release composition.
- the cured surface is a release surface to permit easy release or peeling of the liner from the facestock so that the facestock or label can be readily applied to a substrate surface.
- the release surface is usually a cross-linked poly-di-methyl-siloxane (silicone), but also can be other coatings with very low surface energy.
- the liner After preparation of the surface of the liner with the release composition, the liner is then coated with a pressure sensitive adhesive.
- Methods for coating the adhesive onto the surface of the release composition on the liner include knife coating, roller coating, gravure coating, spray coating and other forms of known coating.
- the adhesive coated liner After application of the adhesive on the release composition coating liner, the adhesive coated liner is laminated onto the thin polyethylene facestock.
- the thin polyethylene facestock also may be coated with the adhesive and then the adhesive-coated film is laminated with the release composition coated liner.
- Adhesives which may used in the invention include copolymers of vinyl acetate, vinyl ethers, vinyl chloride, copolymers of styrene, butadiene, acrylonitrile, acrylics and isoprene.
- the adhesives also might contain tackifiers based on natural rosin or synthetic hydrocarbons, and plasticizers such as mineral oil or phthalates.
- Commercial adhesives which may be used include, but are not limited to Robond available for Rohm & Haas, Acronal available from BASF and Flexcryl commercially available from Air Products.
- the facestock film which is formed into and used as labels generally is wound and then unwound into roll form.
- the total construction or laminate is wound into a master roll forming the pressure sensitive adhesive laminate roll.
- This roll of stock then may be die cut and printed into labels.
- the labels with liner may also, however, be supplied as sheets.
- the lamination process using thin materials of the invention requires careful monitoring of the tension of the stock forming the rolls.
- automatic tension control equipment and vacuum rollers are used in the lamination process.
- the web tension throughout the coating line for making the paper lined polyethylene film should be at a minimum level of 300 N/m in order to ensure the functionality of the web guides and that web handling through coating stations and dryers.
- High tensions stretch the film for the facestock, especially polyethylene, and this results in severe machine directional curl of the pressure sensitive label stock as the film tries to return to its original dimensions after the facestock and the liner are joined together.
- vacuum rollers should be on the coating machine. Vacuum rollers allow the web tension to be dropped to a level that does not stretch the film before lamination.
- the vacuum roller(s) should be located in close proximity to the laminator to ensure a short web path for the web(s) with low tensions for the reasons set forth above.
- the close proximity to the next isolated tension group, the laminator requires an extremely precise control loop in order to properly function.
- High precision equipment and care are required to make a functional loop especially in the acceleration and deceleration of a coating line.
- Vacuum rollers also prevent the web from forming creases as opposed to tension groups with nips when the tension is low.
- the vacuum roller is located just upstream of the lamination nip where the facestock and paper liner are laminated.
- the vacuum roller has a lower speed than the line speed and the film label is held with the vacuum which permits lowering the tension on the film label prior to lamination. This helps reduce film stretching which in turn reduces label curl.
- the thin paper liner used in the invention is a glassine paper made using a pulp made by a chemical sulphate pulping process on wood fibers and ECF and subsequent bleaching.
- wood Prior to the chemical pulping of the fibers, wood is mechanically debarked and cut into chips, and the chips are screened before they are treated chemically to form fibrous pulp.
- Lignin and some carbohydrate material are dissolved from wood chips during cooking the chips in aqueous solutions of several alternative alkaline, neutral, or acid components at elevated temperature and pressure, * Bleaching the cooked chips is a known purification process in which colored substances in the chips are modified so that they either loose their light absorption ability or they dissolve. Bleaching also reduces the lignin content to zero or a near zero level.
- the bleached pulp is dried and baled for shipment to the paper mill.
- the paper is manufactured from the bleached pulp on the paper machine by using the aforedescribed fibers, surface sizing and internal sizing agents.
- the components are prepared and diluted into high amount of water (99%) and sent to the paper machine.
- the water is removed during paper making process by using different unit operations (wet end, press section, drying section).
- the paper is first dried into low moisture content and the paper is surface sized. After this part the paper is remoistured to high moisture (>15%) and reeled for supercalendering.
- Supercalendering is done by using high stack of soft and hard rolls and leading the paper web between the nips. High temperature and pressure of about 90 to 140EC and 450 to 500 kN/m (at the maximum) are used in supercalendering. After supercalendering, the paper is ready for slitting. The moisture content of ready paper is 5.5-7.5%.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US53230403P | 2003-12-23 | 2003-12-23 | |
US60/532,304 | 2003-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005061643A1 true WO2005061643A1 (en) | 2005-07-07 |
Family
ID=34710257
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2004/050197 WO2005061643A1 (en) | 2003-12-23 | 2004-12-22 | Thin polyethylene pressure sensitive labels |
Country Status (2)
Country | Link |
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US (1) | US7399509B2 (en) |
WO (1) | WO2005061643A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1827825A1 (en) * | 2004-12-21 | 2007-09-05 | Basell Poliolefine Italia S.r.l. | Heat-sealable polyolefin films |
ATE547493T1 (en) * | 2007-09-06 | 2012-03-15 | Upm Raflatac Oy | METHOD FOR PRODUCING A LABEL LAMINATE |
US8460774B2 (en) * | 2010-07-02 | 2013-06-11 | Appleton Papers Inc. | Splice tape for imprintable webs |
FI20125333L (en) * | 2012-03-23 | 2013-10-11 | Upm Raflatac Oy | The surface material film of the sticker |
BR112015024217A2 (en) | 2013-04-26 | 2017-07-18 | Avery Dennison Corp | apparatus for dispensing pressure sensitive adhesive labels onto a substrate |
WO2015061267A1 (en) | 2013-10-21 | 2015-04-30 | Avery Dennison Corporation | Label assembly and method of dispensing low-stiffness labels |
WO2015085086A1 (en) | 2013-12-04 | 2015-06-11 | Temptime Corporation | Condition change labels |
ES2659454T3 (en) | 2015-02-23 | 2018-03-15 | Upm Specialty Papers Oy | Process for making paper comprising bleached chemothermal paste suitable for a removable coating and products and uses thereof |
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US7399509B2 (en) | 2008-07-15 |
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