US20140054193A1 - Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label - Google Patents

Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label Download PDF

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Publication number
US20140054193A1
US20140054193A1 US14/000,488 US201214000488A US2014054193A1 US 20140054193 A1 US20140054193 A1 US 20140054193A1 US 201214000488 A US201214000488 A US 201214000488A US 2014054193 A1 US2014054193 A1 US 2014054193A1
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United States
Prior art keywords
label
polyethylene
film
shrinkage
consumer product
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Pending
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US14/000,488
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English (en)
Inventor
Barron G. McKillip
Barry Hostetter
Edward Wiegand
Ulrich E. Weyermann
William J. Martin
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CCL Label Inc
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Sancoa International Co LP
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Priority to US14/000,488 priority Critical patent/US20140054193A1/en
Assigned to SANCOA INTERNATIONAL COMPANY, L.P. reassignment SANCOA INTERNATIONAL COMPANY, L.P. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MARTIN, WILLIAM J., HOSTETTER, Barry, MCKILLIP, BARRON G., WEYERMANN, ULRICH E., WIEGAND, EDWARD
Publication of US20140054193A1 publication Critical patent/US20140054193A1/en
Assigned to CCL LABEL, INC. reassignment CCL LABEL, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SANCOA INTERNATIONAL CO., LP
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/02—Wrappers or flexible covers
    • B65D65/22—Details
    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/027—Thermal properties
    • B32B7/028—Heat-shrinkability
    • 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
    • B32B27/08—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 synthetic resin
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/516—Oriented mono-axially
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • 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
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene

Definitions

  • Unidirectional heat shrinkable films have been used to label and decorate containers and items based on transverse direction or machine direction shrinkage.
  • Transverse direction shrink films are typically converted to sleeves prior to application to the container or item to be labeled.
  • Machine direction shrink films are applied by a roll fed method or in certain applications as a pressure-sensitive label.
  • Such heat shrinkable films have been produced from polyvinyl chloride (PVC) and polystyrene (OPS) for applications related to pressure-sensitive labels for cylindrical dry cell batteries.
  • PVC polyvinyl chloride
  • OPS polystyrene
  • Other heat shrinkable films based on polyethylene terephthalate glycol modified (PETG) and polypropylene (PP) have also been mentioned as potential candidates. Labels may be designed as a single ply or a lamination of two or more films. Unidirectional orientation techniques are disclosed in U.S.
  • Oriented films are an important class of industrial products useful in the wrapping or packaging of various articles of commerce.
  • Oriented isotactic polypropylene film is known to be useful for its high barrier properties, clarity and stiffness.
  • Polypropylene polymers used for oriented films are typically isotactic homopolymers, or blends of isotactic polypropylene polymers with differing melt flow rates (MFR) or tacticity indices, or blends of isotactic polypropylene with atatic polypropylene, syndiotactic polypropylene, random polypropylene copolymers having minor amounts of ethylene or higher alpha-olefins, and ethylene copolymers. See, for example, U.S. Pat. Nos.
  • Heat shrinkable films are further described in U.S. Pat. Nos. 4,194,039; 3,808,304; 4,188,350; 4,194,039; 4,377,616; 4,390,385; 4,448,792; 4,582,752; and 4,963,418.
  • the manufacture of polypropylene heat shrinkable films using modifiers in a polypropylene-based shrink layer to make films suitable for packaging, labeling, and other applications is disclosed in U.S. Pat. Nos. 5,691,043; 5,888,640; 6,303,233; 6,322,883 and 6,908,687.
  • polyolefin-based heat shrinkable films are preferred due to their inherent lower density and higher yield at equivalent thickness.
  • Polypropylene-based machine direction heat shrinkable films have been prepared by machine direction uniaxal orientation of cast and biaxially oriented films.
  • Machine direction uniaxal oriented cast polypropylene films have been characterized as having unbalanced tensile properties, poor film flatness, high shrinkage forces, high shrink temperatures and maximum shrinkage of 40 percent.
  • Machine direction uniaxal-oriented, biaxially-oriented polypropylene films have been characterized as haying high shrinkage forces, high shrink temperatures and maximum shrinkage of 40 percent. Accordingly, there is a need in the art for improved heat shrinkable films.
  • the present invention is an unidirectional-oriented polyethylene-based heat shrinkable label composed of a biaxial-oriented and subsequently uniaxial machine direction-oriented polyethylene film that has unidirectional shrinkage of more than 20% in the machine direction and less than 5% shrinkage in the transverse direction at a temperature below the melting temperature and has been print and cut to conform to a consumer product.
  • the polyethylene is High Density Polyethylene, Medium Density Polyethylene, Low Density Polyethylene, Linear-Low Density Polyethylene, Ultra Low Density Polyethylene or Very Low Density Polyethylene, High Molecular Weight High Density Polyethylene, or blends of homopolymers or copolymers thereof.
  • the label film includes one or more additives that improve processing properties, shrinkage properties, tensile properties or optical properties.
  • shrinkage of the label is greater than 40% in the machine direction.
  • Some embodiments feature a monolayer or multilayered label, whereas other embodiments include the use of a non-shrink film, such as a biaxial oriented polyethylene or biaxial oriented polypropylene film.
  • Still further embodiments include a transparent outer layer film, a pressure-sensitive adhesive, e.g., having a high temperature shear strength of up to 71° C., and a release liner.
  • a consumer product such as container, bottle, tube or battery containing the label is provided as is a method for labeling a consumer product.
  • FIG. 1 shows a heat shrinkable pressure-sensitive label applied over the edge of a tube where the body and the shoulder of the head meet ( FIG. 1A ) such that, upon heat treatment, the label shrinks against the head ( FIG. 1B ) and completely covering the tube body ( FIG. 1C ).
  • FIG. 2 shows a heat shrinkable pressure-sensitive label applied over the edge of a dry cell battery. As illustrated, the label is cut to a length that is longer than the length of the battery ( FIG. 2A ), the label is applied to the battery ( FIG. 2B ) and, upon heat treatment, the label shrinks against the should of the batter and covers a portion of the top and bottom ends of the battery ( FIG. 2C ).
  • the present invention is a printed and cut label produced from an unidirectional-oriented polyethylene-based heat shrinkable polymeric film.
  • the instant label can be combined with a pressure-sensitive adhesive and used to label various consumer products.
  • the instant label has several advantages over labels of the prior art.
  • the instant label is produced with a biaxial-oriented and subsequently uniaxial machine direction-oriented polyethylene heat shrink film thereby providing the ability to use thinner films and produce labels with balanced tensile properties.
  • the instant label exhibits exemplary shrink performance, with machine direction shrinkage of 20% to 75%.
  • the instant label exhibits low residual shrink force/shear force, having machine direction shrinkage of less than 5% below 80° C.
  • the instant label exhibits a transverse direction shrinkage of less than 5%
  • the instant label is stable during manufacture, shipping, and storage.
  • Machine direction tensile properties and flex stiffness are enhanced by the machine direction uniaxial orientation process thereby providing the instant label to exhibit good processability during label manufacture, label dispensing and end use.
  • the instant label is an all-polyethylene label, the label is environmentally friendly and sustainable.
  • the term “oriented” refers to a thermoplastic web which forms a film structure in which the web has been elongated in either one direction (“uniaxial”) or two directions (“biaxial”) at elevated temperatures followed by being “set” in the elongated configuration by cooling the material while substantially retaining the elongated dimensions.
  • This combination of elongation at elevated temperatures followed by cooling causes an alignment of the polymer chains to a more parallel configuration, thereby improving the mechanical properties of the polymer web.
  • heat shrinkage may be produced.
  • the film of the instant label is biaxial-oriented and subsequently uniaxial machine direction-oriented.
  • the machine direction uniaxial orientation process is known in the art.
  • the film is drawn by a pull roll, threaded through a machine direction orientation, which is composed of one or more pre-heated rolls, one or more stretching stages with an annealing roll after one or more stretching stages, a conditioning and annealing roll, and a chill roll. All rolls are individually driven and temperature controlled. Stretching is done by inducing a speed differential between two adjacent rolls in the stretching stages, wherein the maximum stretching ratio is dictated by the material.
  • the stretching or orientation ratio is defined as the ratio of the speed of the second roll in the stretching stage divided by the speed of the first roll in the stretching stage.
  • Machine direction orientation results when the stretching ratio is greater than one.
  • the level of machine direction and transverse direction shrinkage is a result of the stretching ratio with higher stretching ratios resulting in higher machine direction shrinkage. Annealing after stretching is minimized and preferably at a temperature below 100° C. to maintain the machine direction shrinkage properties above 80° C. Machine direction shrinkage properties are a result of material selection and biaxial orientation and uniaxial orientation process conditions.
  • a unidirectional heat shrinkable label is defined herein as a label having shrinkage greater than 20%, 25%, 30%, 35%, 40%, or most preferably greater than 45% in the shrink direction (i.e., machine direction).
  • shrinkage of the instant label is ⁇ 75% at ⁇ 10° C. the melting point of the film.
  • shrinkage of the instant label is 20% to 75% in the machine direction at ⁇ 10° the melting point of the film.
  • shrinkage in the transverse direction is less than 10% and preferably less than 5% at temperatures below the melting temperature of the film.
  • shrinkage does not occur at the use or distribution temperatures of a product containing the instant label and is only invoked upon exposure to temperatures above the use or distribution temperature range during the label application process.
  • particular embodiments of the instant label feature shrinkage beginning at greater than 80° C.
  • the percentage of shrink can be measured according to conventional methods including, e.g., ASTM D1204.
  • machine direction shrinkage of the instant label is greater than 40% between 100° C. and 135° C. and less than 5% in the traverse direction. Moreover, machine direction shrinkage is less than 5% up to 80° C. and traverse direction shrinkage is less than 5% up to 135° C.
  • the unidirectional-oriented heat shrinkable label of the present invention is composed of a primary polymeric component, which is a polyethylene.
  • the polyethylene is composed of at least one polyethylene homopolymer, copolymers of polyethylene, blends of homopolymers or copolymers thereof that may be used in isolation as the primary polymeric component or combined with other polymeric materials or additive components to form the primary polymeric component.
  • Exemplary polyethylene polymers of use in the instant label include High Density Polyethylene (HDPE; density greater than 0.941 g/cm 3 ; melting temperature 126-135° C.), Medium Density Polyethylene (MDPE; density between 0.926 and 0.940 g/cm 3 ; melting temperature 120-125° C.), Low Density Polyethylene (LDPE; density between 0.910 and 0.925 g/cm 3 ; melting temperature 105-118° C.), Linear-Low Density Polyethylene (LLDPE; density between 0.919 and 0.925 g/cm 3 ; melting temperature 126° C.), Ultra Low Density Polyethylene (ULDPE) or Very Low Density Polyethylene (VLDPE; density between 0.885 and 0.915 g/cm 3 ), High Molecular Weight HDPE (HMW-HDPE; density in the range of 0.935 and 0.955 g/cm 3 ) and analogues with bimodal and multimodal molecular weight distribution (see U.S
  • blends of polyethylene homopolymers or copolymers contain >50% ethylene.
  • the polyethylene of the instant label contains at least one polyethylene.
  • the polyethylene of the instant label consists of a polyethylene, or a blend of polyethylene homopolymers or polyethylene copolymers.
  • the primary polymeric component or polyethylene is preferably from about 50 wt. % to about 100 wt. % of the unidirectional-oriented heat shrinkable polymeric film used in the production of the instant label.
  • blends of HMW-HDPE and LLDPE wherein the blend ratio is between 80/20 to 20/80, and melting index (190° C.) between 0.01 and 0.05 dg/minute (see U.S. Pat. No. 6,613,841).
  • the instant label is produced with a HMW-HDPE with a density between 0.935 and 0.948 g/cm 3 and melting index (190° C., ASTM 1238) between 0.03 and 0.15 dg/minute (see U.S. Pat. No. 7,011,892).
  • Blends of HDPE, MDPE, LLDPE, VLDPE including bimodal and multimodal molecular weight distribution are embraced by the present invention (see U.S. Pat. No. 8,034,461).
  • the instant label contains greater than 50 wt. % HDPE or MDPE.
  • the instant label contains bimodal or multimodal HDPE.
  • the instant label contains 0% LDPE.
  • the labels of the present invention can also include an additive to improve or alter processing properties, shrinkage properties, tensile properties and optical properties.
  • Certain additives can also be used to enhance the ability to unidirectional orient the film and result in acceptable shrinkage properties.
  • additives include antioxidants, stabilizers, colorants, dispersing aids, and the like.
  • Additives may also be utilized to impart additional functional properties such as coefficient of friction (COF) control, anti-block, or opacity.
  • COF coefficient of friction
  • particular embodiments feature the use of low molecular weight polyethylene (e.g., density 0.950 g/cm 3 , molecular weight 2654-5994 g/mol), olefin waxes, or very low density LLDPE as additives to the instant label.
  • the additive is less than 50 wt. % of film composition.
  • the additive is about 1 wt. % to about 40 wt. % of the film used in the production of the instant label. While some embodiments feature the inclusion of an additive into the film used in the production of the instant label, other embodiments feature the use of an additive in a coating or vanish.
  • the polyethylene-based heat shrinkable label of the invention can be composed of a single component or monolayer film.
  • the polyethylene-based heat shrinkable label is composed of a multilayered film containing two or more distinct layers of similar or of different compositions.
  • Multilayered labels of the invention can include a varnish layer to provide a protective or functional coating; a transparent film outer layer; a reverse-printed transparent film outer layer; a surface-printed transparent film, opaque or metalized inside film layer; a non-shrink film layer; a pressure-sensitive adhesive layer; or a release film liner.
  • Suitable outer layer films for the instant multilayered labels can be composed of machine direction heat shrink polyethylene-based films or non-shrink poylethylene or polypropylene-based films.
  • Non-shrink films can be composed of a polyethylene or polypropylene.
  • the non-shrink polyethylene or polypropylene film may be composed of homopolymers, copolymers or blends of polyethylene or polypropylene homopolymers and copolymers.
  • the label is a laminate, wherein one or more of the films of the laminate are unidirectional heat shrinkable films, and wherein the laminate includes a transparent outer film layer.
  • the label of the invention is a laminate composed of at least two layers, wherein at least one of the laminate film layers is a polyethylene-based unidirectional heat shrinkable film.
  • the label of the invention is a laminate composed of two film layers wherein both film layers are polyethylene-based unidirectional heat shrinkable films.
  • the label of the invention is a laminate, wherein at least one of the films of the laminate is characterized as a polyethylene-based unidirectional heat shrinkable film and the laminate film includes a non-shrink film layer which is biaxial oriented polyethylene-based or biaxial oriented polypropylene-based.
  • the label of the invention is a lamination of more than one film, desirably the films of the laminate are combined by use of a permanent adhesive.
  • Labels of the invention can be produced with a polyethylene unidirectional heat shrinkable film, and optionally a non-shrink film, with film thicknesses of between 10 microns to 200 microns.
  • the label of the invention is a produced from a laminate of a shrink and non-shrink film
  • the thickness of the shrink film is preferably greater than 50% of the total label thickness.
  • Desirably the overall thickness of the instant label is between 0.5 mil to 10 mil.
  • the film of the instant label is produced by obtaining resins of the polyethylene of interest, extruding the polyethylene layer, biaxially orienting the extruded polyethylene layer; and subsequently uniaxial machine direction orienting the biaxially-oriented polyethylene layer to form a machine direction unidirectional-oriented polyethylene-based heat shrinkable polymeric film.
  • the machine direction orientation ratio is greater than 4/1. In other embodiments, the machine direction orientation ratio is less than 13/1. In particular embodiments, the machine direction orientation ratio is between 5/1 to 10/1.
  • the machine direction film shrinkage is a result of the machine direction orientation ratio, where the annealing and stress relaxation is minimized and is at or below 100° C., preferably below 80-90° C.
  • a label produced by the instant method has exceptional shrinkage, tensile properties and stiffness.
  • a label of the invention can be composed of a single film layer or multiple film layers.
  • Multilayer films can be produced by coextrusion, extrusion coating or coating.
  • the instant label is composed of more than one layer, the label can have between one and five layers although any number of layers is possible, including even numbers of film component layers.
  • the surface of the label may be treated with corona or flame or coated to increase surface functionality and surface tension.
  • the label of this invention has superior optical properties and, when composed of a transparent film, has a haze value of less than 10, or more particularly less than 6. Furthermore, the label of the present invention exhibits enhanced storage stability characteristics with shrink levels of less than 5% in the machine direction at or below 60° C., preferably at or below 70° C. or most preferably at or below 80° C. In some embodiments, the label exhibits less than 5% shrinkage in the machine direction at these temperatures.
  • the instant label is produced in roll form and printed with product information, e.g., with graphics, images, text, coloration or other indicia over part or all of the surface of one or more of the films utilized in the label, and cut to the final label dimensions prior to application on the consumer product.
  • product information e.g., with graphics, images, text, coloration or other indicia over part or all of the surface of one or more of the films utilized in the label, and cut to the final label dimensions prior to application on the consumer product.
  • the instant label may be transparent, white, opaque, metalized or contain special enhancements such as embossing.
  • Graphics, coloration, images or text can be reverse-printed or surface-printed.
  • the graphics, coloration, images or text are reverse-printed on a transparent outer layer or surface printed on a transparent, opaque or metalized inside layer.
  • the invention features a label produced from a single ply polyethylene unidirectional heat shrinkable film, wherein the film is reverse-printed or surface-printed with an optional protective coating or varnish covering the print.
  • the invention features a label produced from a polyethylene unidirectional heat shrinkable film as a laminate, wherein where one or more of the films of the laminate are unidirectional heat shrinkable films, and wherein the laminate includes a transparent film as the outer layer.
  • the invention is a label produced from a polyethylene unidirectional heat shrinkable film, wherein the label is either a single ply film or a lamination of two films, and wherein the backside (inside) of the film is coated (100% coverage) with a pressure-sensitive adhesive.
  • the adhesive has a high temperature shear strength of up to 160° F.
  • the label can further include a film-based release liner.
  • the backside (inside) of the label is coated (100% coverage) with a pressure-sensitive adhesive.
  • the pressure-sensitive adhesive is applied after the label is printed with graphics or other indicia.
  • the pressure-sensitive adhesive-coated label can then be laminated to a silicone-coated or similar release film (liner) or release substrate and subsequently die cut to the desired label dimension.
  • the pressure-sensitive adhesive and release liner can be laminated to a base film, which subsequently can be surface printed or alternately laminated to a reverse-printed transparent outside film, and die cut to the desired label dimension.
  • Pressure-sensitive adhesives of use in the instant invention include, but are not limited to, rubbery adhesive agents, vinyl acetate adhesive agents, ethylene-vinyl acetate adhesive agents, polyvinyl alcohol adhesive agents, polyvinyl acetal adhesive agents, vinyl chloride adhesive agents, acrylic adhesive agents, polyamide adhesive agents, polyethylene adhesive agents, cellulose adhesive agents, polysulfide adhesive agents and hot-melt type high-polymer-containing adhesives.
  • a pressure-sensitive adhesive of the invention is pressure-sensitive in nature and is also characterized as being permanent once the label is applied, as having an adhesive shear strength of greater than 400 g/in, and is stable up to 70° C. In other embodiments, the adhesive has a high temperature shear strength of up to 160° F. (71° C.).
  • a resultant pressure-sensitive adhesive applied label maintains good overlap seam integrity and no dog ears or label lift on the ends.
  • the label of the present invention is useful to package and label a variety of products.
  • the label of the invention exhibits a high degree of shrinkage in a very controlled and consistent manner while providing a number of other positive characteristics such as optical clarity, superior handling characteristics, exceptional tensile properties, stiffness and storage stability.
  • the label of the invention contains greater than 10% or greater than 20% polyethylene recycle content.
  • the recycle content of the instant label is in the range of 10 to 90%.
  • the label is of use in labeling, covering and/or decorating a variety of consumer products.
  • the label may be used in a variety of labeling processes including roll fed, sleeve and pressure-sensitive labeling.
  • a consumer product wrapped in a label of the invention is also provided.
  • Consumer products include, containers; bottles; tubes, e.g., flexible plastic tubes; or batteries, e.g., cylindrical dry cell batteries, wherein the label forms at least a 360° full wrap around the circumference of the container, bottle, tube or battery.
  • the shrink label of the invention is useful in tightly covering non-uniform contours of a product and also may extend beyond the height of the product and upon heat shrinkage forming a tight wrap and label to the surface of the product and top and/or bottom surfaces.
  • Labels are produced, slit into a roll with a single lane of labels and applied with the appropriate labeling equipment to a consumer product, wherein the circumference of the consumer product is fully wrapped to at least 360 degrees and is subsequently shrunk tightly to the consumer product with the application of hot air or steam heat.
  • the instant shrink label is particularly useful for application to non-uniform or contoured consumer products where the label as applied is tightly wrapped to the largest diameter of the container and is then, with the application of hot air or steam, shrunk tightly to the smaller diameter and contour areas of the consumer product.
  • the label may also be applied to extend over the top and/or bottom ends of the consumer product and shrunk tightly around the radius and top and/or bottom of the product.
  • the height of the label when applied to a container, may extend beyond the ends of the container or may be equal to the height of the container or cover a part of the height of the container.
  • the label is subsequently heat shrunk to the container so that the label creates a tight and uniform fit to the surface on the container with top and bottom ends encased by the label.
  • the label has a release liner, which is removed prior to application to the container or battery.
  • the label length is more than a full wrap around the consumer product.
  • the label covers and/or decorates a cylindrical consumer product and forms at least a 360° full wrap, or more preferably greater than a 360° full wrap and extends beyond the ends of the cylindrical consumer product.
  • the label height in the transverse direction is designed to be higher than the dimension of the battery so as to extend over the ends of the battery.
  • a heat shrinkable pressure-sensitive label is cut to a length that is longer than the tube and applied to the tube so that the label extends beyond the edge of the tube where the body and the shoulder of the head meet ( FIG. 1A ).
  • the label is exposed to heat thereby causing the label to shrink over the shoulder and completely cover the tube body ( FIG. 1B ).
  • the cap is attached, the tube is completely covered by the label eliminating any undecorated stripe between the tube and cap ( FIG. 1C ).
  • a labeled battery is prepared by cutting the label to a length that is longer than the length of the batter ( FIG. 2A ), the label is adhered to the battery ( FIG. 2B ) and the label is heat shrunk to the battery so that a portion of the top and bottom ends of the battery are encased by the label ( FIG. 2C )
  • Table 1 provides the percent shrinkage of a non-shrink biaxial orientation polyethylene-based monolayer label (Sample #1, 110 gauge) compared to polyethylene-based unidirectional-oriented polyethylene-based heat shrinkable monolayer label produced by biaxial orientation followed by uniaxial machine direction orientation (Sample #2, 75 gauge; #3, 110 gauge; #4, 150 gauge; #5, 175 gauge; and #6, 200 gauge).
  • Table 2 provides label shrinkage of a two-film lamination label.
  • Samples #7-#9 are a lamination of two films where both films are polyethylene-based unidirectional-oriented polyethylene-based heat shrinkable films produced by biaxial orientation followed by machine direction orientation.
  • Samples #10-#11 are a lamination of two films where the outside film is a polyethylene-based unidirectional-oriented polyethylene-based heat shrinkable film produced by biaxial orientation followed by machine direction orientation and the inside film is a non-shrink biaxial orientation polyethylene-based film. Films used in the labels are selected from the films listed in Table 1.
  • Sample #7 is a lamination of #3 (100 gauge) and #2 (75 gauge); Sample #8 is a lamination of two #2 films (each 75 gauge); Sample #9 is a lamination of #4 (150 gauge) and #2 (75 gauge); Sample #10 is a lamination of #3 (100 gauge) and #1 (110 gauge); and Sample #11 is a lamination of #6 (200 gauge) and #1 (110 gauge).
  • Table 3 provides the tensile and optical properties of a non-shrink biaxial orientation polyethylene-based film (#1, 110 gauge) and polyethylene-based unidirectional-oriented heat shrinkable films produced by biaxial orientation followed by uniaxial machine direction orientation (#2, 75 gauge; #3, 110 gauge; #4, 150 gauge; #5, 175 gauge; #6, 200 gauge) and of two-film lamination labels.
  • Lamination Samples #7-#9 where composed of two films, each being a polyethylene-based unidirectional-oriented polyethylene-based heat shrinkable film produced by biaxial orientation followed by machine direction orientation (#7, 110 gauge+75 gauge; #8, 200 gauge+75 gauge; #9, two 75 gauge films).
  • Lamination Samples #10-#11 were composed of two films where the outside film was a polyethylene-based unidirectional-oriented heat shrinkable film produced by biaxial orientation followed by machine direction orientation and the inside film was a non-shrink biaxial orientation polyethylene-based film (#10, 110 gauge PE MDS+110 PE; #11, 200 gauge PE MDS+110 PE). Tensile modulus for Sample #1-#6 was at 5% elongation and for Sample #7-#11 was at 2% elongation.
  • Table 4 provides the percent machine direction shrinkage of alternative machine direction shrink films.
  • PVC 211/01 is PENTALABEL Rigid Vinyl 0M-L211/01
  • PVC 210/01 is PENTALABEL Rigid Vinyl 0M-L210/01
  • PETG 20/30 is 2 mil clear PETG 0M-EG20/30
  • PETG 20/40 is 2 mil clear PETG 0M-EG20/40, each from Klockner Pentaplast.
  • PP is a multilayer polypropylene film as described in Example 4 of U.S. Pat. No. 6,908,687.
  • Method 1 An extruded body tube sleeve is produced using mono or multilayer coextrusion process and the sleeve is cut to the desired length.
  • the head is affixed to the tube body by compression molding or other means.
  • the surface energy of tube body and conical head of tube is increased (e.g., by corona or flame treatment) to accept label adhesive most effectively.
  • the label is applied with the edge of label overlapping but not yet adhered to the conical section of head. Heated air or radiant heat is then applied to the portion of the label overlapping the conical head to induce label shrinkage.
  • Adherence of the label to the conical head is facilitated by a soft roller, pressing ring conforming to the shape of the head or other means to intimately bond the adhesive to the head.
  • the tube and/or closure is rotated to a position suitable to orient a closure to the front panel graphics on the label of the tube. Subsequently, the cap is applied.
  • Method 2 An extruded body tube sleeve is produced using mono or multilayer coextrusion and the sleeve is cut to the desired length. Subsequently, the surface energy of tube body is increased to accept label adhesive most effectively. The sleeve is then positioned accurately on a mandrel with respect to the location of the label edge to be dispensed onto the sleeve. The label is applied to the tube sleeve with the edge of the label even with the end of the tube sleeve. An injection molded head is then welded to the tube sleeve containing the label using hot air system known in the art of tube making.
  • the hot air used in the head welding operation will induce label shrinkage as the tube sleeve confirms to the shape of the tube head.
  • the tube is rotated on a mandrel and/or closure to a position suitable to orient a closure to the front panel graphics on the label of the tube. Subsequently, the cap is applied.
  • Example 2 The method described in Example 2 can be modified to allow oriented screw-on caps by molding lugs into the compression molded head in a consistent location relative to the thread start position. A sensor in the process will then detect this lug and use it as a signal to apply the label relative to the lug and therefore thread start position. When the cap is screwed onto the tube, it will consistently end up in the correct location relative to the label graphics.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Wrappers (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
US14/000,488 2011-02-23 2012-02-23 Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label Pending US20140054193A1 (en)

Priority Applications (1)

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US14/000,488 US20140054193A1 (en) 2011-02-23 2012-02-23 Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label

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US201161445803P 2011-02-23 2011-02-23
US201161492957P 2011-06-03 2011-06-03
PCT/US2012/026271 WO2012116149A2 (fr) 2011-02-23 2012-02-23 Etiquette polymère thermorétractable à base de polyéthylène à orientation unidirectionnelle
US14/000,488 US20140054193A1 (en) 2011-02-23 2012-02-23 Unidirectional Oriented Polyethylene-Based Heat Shrinkable Polymeric Label

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CA (1) CA2827949C (fr)
ES (1) ES2720154T3 (fr)
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PL (1) PL2678158T3 (fr)
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US20150321818A1 (en) * 2012-12-14 2015-11-12 Windmöller & Hölscher Kg Compression packaging, packaging unit and method for producing a packaging unit
CN110356698A (zh) * 2018-04-10 2019-10-22 万臣塑料制品(上海)有限公司 一种微量收缩贴标管制造方法及贴标管及预加热贴标装置
CN112262191A (zh) * 2018-06-08 2021-01-22 Upm拉弗拉塔克公司 洗脱型标签

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US20150321818A1 (en) * 2012-12-14 2015-11-12 Windmöller & Hölscher Kg Compression packaging, packaging unit and method for producing a packaging unit
CN110356698A (zh) * 2018-04-10 2019-10-22 万臣塑料制品(上海)有限公司 一种微量收缩贴标管制造方法及贴标管及预加热贴标装置
CN112262191A (zh) * 2018-06-08 2021-01-22 Upm拉弗拉塔克公司 洗脱型标签
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EP2678158A4 (fr) 2015-04-01
MX363059B (es) 2019-03-06
EP2678158A2 (fr) 2014-01-01
WO2012116149A2 (fr) 2012-08-30
ES2720154T3 (es) 2019-07-18
RU2621598C2 (ru) 2017-06-06
PL2678158T3 (pl) 2019-08-30
EP2678158B1 (fr) 2019-01-16
CA2827949A1 (fr) 2012-08-30
CA2827949C (fr) 2020-02-25
WO2012116149A3 (fr) 2014-04-24
EP3326809A1 (fr) 2018-05-30
MX2013009765A (es) 2015-05-15
RU2013142933A (ru) 2015-03-27

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