US20170036426A1 - Multilayer barrier structures, methods of making the same and packages made therefrom - Google Patents

Multilayer barrier structures, methods of making the same and packages made therefrom Download PDF

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Publication number
US20170036426A1
US20170036426A1 US15/297,909 US201615297909A US2017036426A1 US 20170036426 A1 US20170036426 A1 US 20170036426A1 US 201615297909 A US201615297909 A US 201615297909A US 2017036426 A1 US2017036426 A1 US 2017036426A1
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Prior art keywords
layer
polyamide
multilayer structure
method
structures
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US15/297,909
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Michael J. Douglas
Duane H. Buelow
Chad D. Mueller
Robert J. Blemberg
Roberto Pascual Castellani
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Transcontinental Us LLC
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Coveris Flexibles Us LLC
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Priority to US45364103P priority
Priority to US10/735,366 priority patent/US20040175466A1/en
Priority to US11/029,200 priority patent/US9498936B2/en
Priority to US15/297,909 priority patent/US20170036426A1/en
Application filed by Coveris Flexibles Us LLC filed Critical Coveris Flexibles Us LLC
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Assigned to ALCAN PACKAGING FLEXIBLE FRANCE reassignment ALCAN PACKAGING FLEXIBLE FRANCE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: PECHINEY EMBALLAGE FLEXIBLE EUROPE
Assigned to BEMIS COMPANY, INC. reassignment BEMIS COMPANY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALCAN PACKAGING FLEXIBLE FRANCE
Assigned to EXOPACK, LLC reassignment EXOPACK, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BEMIS COMPANY, INC.
Publication of US20170036426A1 publication Critical patent/US20170036426A1/en
Assigned to TRANSCONTINENTAL US LLC reassignment TRANSCONTINENTAL US LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: COVERIS FLEXIBLES US LLC
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered 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
    • B32B27/08Layered 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/16Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/34Layered products comprising a layer of synthetic resin comprising polyamides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D65/00Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38Packaging materials of special type or form
    • B65D65/40Applications of laminates for particular packaging purposes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D71/00Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans or pop bottles; Bales of material
    • B65D71/06Packaging elements holding or encircling completely or almost completely the bundle of articles, e.g. wrappers
    • B65D71/08Wrappers shrunk by heat or under tension, e.g. stretch films or films tensioned by compressed articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D85/00Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00Ancillary operations in connection with laminating processes
    • B32B38/0036Heat treatment
    • B32B2038/0048Annealing, relaxing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00Ancillary operations in connection with laminating processes
    • B32B2038/0052Other operations not otherwise provided for
    • B32B2038/0076Curing, vulcanising, cross-linking
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514Oriented
    • B32B2307/518Oriented bi-axially
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/732Dimensional properties
    • B32B2307/734Dimensional stability
    • B32B2307/736Shrinkable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00Polyalkenes
    • B32B2323/04Polyethylene
    • B32B2323/046LDPE, i.e. low density polyethylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00Containers; Receptacles
    • B32B2439/70Food packaging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00Tubular articles, e.g. hoses, pipes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2275/00Details of sheets, wrappers or bags
    • B65D2275/02Sheets wrappers or bags provided with protective or puncture resistant patches, specially adapted for meat on the bone, e.g. patch bags
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]

Abstract

Multilayer structures, methods of making the same and packages made therefrom are provided. The multilayer structures are useful for packaging bone-in meat or other like products. More specifically, the multilayer structures have sufficient rigidity and strength to contain bone-in meat or other like products, while also maintaining good oxygen barrier properties. In addition, multilayer structures can easily seal to themselves or to other structures. Moreover, the multilayer structures are biaxially oriented and heat-shrinkable.

Description

    TECHNICAL FIELD
  • Multilayer structures, methods of making the same and packages made therefrom useful for packaging products, such as bone-in meat, cheese and other like products are provided. More specifically, the present invention relates to multilayer structures, methods of making the same, and packages made therefrom useful for bone-in meat packaging, cook-in packaging, shrink film packaging, packaging for case ready meats, hot-fill applications, pet food, retort or lidding, and other like packaging. The multilayer structures are coextruded and have sufficient durability, strength, tear resistance and puncture resistance, while also providing a high degree of oxygen barrier protection. In addition, the present invention relates to multilayer barrier structures, methods of making the same, and packages made therefrom useful for packaging that is biaxially oriented so as to be heat-shrinkable around products.
  • BACKGROUND
  • It is generally known to utilize thermoplastic multilayer structures, such as films, sheets or the like, to package products. For example, typical products packaged with thermoplastic multilayer structures include perishable products, such as food. Specifically, meats and cheeses are typically packaged in thermoplastic structures. In addition, it is generally known that cook-in structures may be utilized to package food products, whereby the products are then heated to cook the food products contained within the packages. Moreover, shrink films are known for packaging food products, such as meat and cheese.
  • One type of meat that may be packaged within thermoplastic multilayer structures is bone-in meat. Bone-in meat products often contain sharp bones that protrude outwardly from the meat. Typical cuts of bone-in meat include a half carcass cut, hindquarter cut, round with shank, bone-in shank, full loin, bone-in ribs, forequarter, shoulder and/or other like cuts of meat. When bone-in meat products are packaged and/or shipped, the protruding bones often can puncture or tear the packaging materials. This puncturing or tearing of the packaging material by the protruding bones can occur at the initial stage of packaging or at the later stage of evacuation of the packaging, which may expose the bone-in meat products to oxygen and moisture, thereby having deleterious effects on the bone-in meat product.
  • Many techniques and products have been developed for preventing bone puncture or tear. U.S. Pat. No. 6,171,627 to Bert discloses a bag arrangement and packaging method for packaging bone-in meat using two bags to provide a double wall of film surrounding the cut of meat for bone puncture resistance.
  • U.S. Pat. No. 6,015,235 to Kraimer discloses a puncture resistant barrier pouch for the packaging of bone-in meat and other products.
  • U.S. Pat. No. 6,183,791 to Williams discloses an oriented heat-shrinkable, thermoplastic vacuum bag having a protective heat-shrinkable patch wherein the heat-shrinkable patch substantially covers all areas exposed to bone, thereby protecting the bag from puncture.
  • U.S. Pat. No. 5,020,922 to Schirmer discloses a seamless puncture resistant bag which includes a length of lay-flat seamless tubular film folded to a double lay-flat configuration. The configuration forms a seamless envelope with one face thickened integrally to triple thickness.
  • U.S. Pat. No. 5,534,276 to Ennis discloses an oriented heat-shrinkable, thermoplastic vacuum bag having a protective heat-shrinkable reverse printed patch attached to the bag.
  • The art teaches many techniques for addressing the problem of bone puncture or tear in the packaging of bone-in meat products. Many of the solutions typically include a film structure or bag having patches, double-walled thicknesses or the like. However, a need exists for multilayer structures that may be utilized for packaging bone-in meat products and other like products that have sufficient durability, strength, and puncture resistance so as to keep the multilayer structures from being punctured by bony protrusions from the meat, and yet is heat-sealable so as to form packaging that can seal to themselves or other structures. In addition, there exists a need in the art for economical and commercially viable multilayer structures to form heat-sealable and heat-shrinkable packages for bone-in meat products.
  • One solution for packaging bone-in meat entails the utilization of coextruded multilayer structures having sufficient strength, durability, tear resistance, puncture resistance, and optical properties. However, the formation of coextruded multilayer structures having these properties is difficult without laminating the structures to provide double-walled structures and/or laminating or otherwise adhering patches to the structures. Laminating structures together to form double-walled structures or otherwise adhering patches to the structures requires multiple complicated processes, thereby requiring additional time and money.
  • For example, known coextruded structures that may be useful for the present invention require very thick coextrusions to provide adequate puncture resistance for bone-in meat. This requires the use of large quantities of fairly expensive polymeric materials to provide the protection against puncture and tearing. This problem is typically solved, as noted above, by laminating structures together to form patches in the areas of the structures most susceptible to breaking or puncturing. These patches, while allowing the use of less thermoplastic material, can be unsightly in that the surface of the films are interrupted by the patches. In addition, the lamination process of adding the patches to the films can cause decreased optical characteristics, in that patches can become hazy or yellow. Moreover, the areas of the patches also suffer from decreased optical properties due to the thicknesses of the patches and the patches tend to interfere with the shrink characteristics of the structures. Still further, the application of the patches requires extra steps in addition to the steps of making the structures, including precisely, positioning the patches where bony protrusions are likely to be.
  • In addition, many coextruded structures having the durability and strength to package bone-in meat have sealability problems. As noted above, the structures must be fairly thick to provide adequate puncture resistance. Typically, heat-sealing bars are utilized to seal the structures together. If a structure is too thick, the sealing bars will have difficulty in transferring an adequate amount of heat to the heat-sealing layers to melt the heat-sealing layers of the structures to provide adequate heat-seals. Inadequate heat-seals cause leaks, thereby exposing products contained within packages made from the structures to both oxygen and moisture, which may deleteriously affect the products.
  • In addition, thicker structures tend to have a decrease in optical properties compared to relatively thinner structures. A structure's thickness is directly related to haze. Thicker structures, therefore, tend to have an increase in haze, thereby contributing to a decrease in the clarity of the structures. In addition, thicker structures tend to be more difficult to orient. Thicker structures tend to have a lower shrink energy, thereby requiring an increase in orientation ratio to provide similar shrink characteristics as compared to thinner structures.
  • A need, therefore, exists for coextruded multilayer structures having superior strength, durability, tear resistance and puncture resistance that are significantly thinner than known structures while maintaining superior optical properties, such as low haze, low yellowness, and high clarity. In addition, a need exists for coextruded multilayer structures, that are orientable to provide packages that are heat shrinkable around products. In addition, coextruded multilayer structures are needed having superior sealability as compared to known structures, while still maintaining the superior strength, durability, puncture resistance, tear resistance and optical properties. In addition, methods of making the multilayer structures and packages made therefrom are needed.
  • SUMMARY
  • Multilayer structures, methods of making the same and packages made therefrom useful for packaging products, such as bone-in meat, cheese and other like products are provided. More specifically, the present invention relates to multilayer structures, methods of making the same, and packages made therefrom useful for bone-in meat packaging, cook-in packaging, shrink film packaging, packaging for case ready meats, hot-fill applications, pet food, retort or lidding, and other like packaging. The multilayer structures are coextruded and have sufficient durability, strength, tear resistance and puncture resistance, while also providing oxygen barrier protection. In addition, the present invention relates to multilayer barrier structures, methods of making the same, and packages made therefrom useful for packaging that is biaxially oriented so as to be heat-shrinkable around products.
  • Multilayer structures, methods of making the same and packages made therefrom are provided. More specifically, the multilayer structures can be utilized for packaging products having bony protrusions or the like that would easily tear or puncture other structures.
  • To this end, in an embodiment of the present invention, a multilayer structure for packaging bone-in meat is provided. The multilayer structure comprises an outer layer comprising a blend of linear low density polyethylene and low density polyethylene, a first polyamide layer comprising a blend of between about 70% by weight and about 99% by weight semi-crystalline polyamide and about 1% by weight to about 30% by weight amorphous polyamide, a first tie layer disposed between said outer layer and said first polyamide layer, a barrier layer disposed adjacent said first polyamide layer wherein said barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between about 27 mol % and about 42 mol %, a second polyamide layer disposed adjacent said barrier layer comprising a blend of between about 70% by weight and about 99% by weight semi-crystalline polyamide, and between about 1% by weight and about 30% by weight amorphous polyamide, a sealant layer comprising a blend of linear low density polyethylene and low density polyethylene wherein said sealant layer comprises a greater volume percent than said outer layer, and a second tie layer disposed between said sealant layer and said second polyamide layer.
  • Moreover, the first and second polyamide layers each may comprise a blend of between about 85% by weight and about 99% by weight semi-crystalline polyamide and between about 1% by weight and about 15% by weight amorphous polyamide. Alternatively, said first and second polyamide layers each may comprise a blend of between about 60% by weight and about 80% by weight of a first semi-crystalline polyamide, between about 10% by weight and about 30% by weight of a second semi-crystalline polyamide, and between about 1% by weight and about 30% by weight amorphous polyamide. The first and said second polyamide layers may comprise about an equal percent by volume of the multilayer structure.
  • In addition, the outer layer may be between about 15% by volume and about 20% by volume of the multilayer structure and the heat sealant layer may be between about 25% by volume and about 30% by volume of the multilayer structure.
  • In addition, the multilayer structure may be oriented. Further, the multilayer structure may be annealed. Still further, the multilayer structure may be moisturized by the application of water to said multilayer structure. The multilayer structure may further be plasticized. In addition, the multilayer structure may be irradiated to promote crosslinking between the layers of said multilayer structure and/or within a layer of said multilayer structure.
  • Further, all layers of the multilayer structure of the present embodiment may be coextruded to form said multilayer structure. Preferably, the multilayer structure may be between about 1 mil and about 8 mils thick. Most preferably, the multilayer structure may be between about 1.5 mils and about 5 mils thick.
  • In an alternate embodiment of the present invention, a package for bone-in meat is provided. The package comprises a first wall comprising a multilayer structure comprising an outer layer comprising a blend of linear low density polyethylene and low density polyethylene; a first polyamide layer comprising a blend of about 70% by weight to about 99% by weight semi-crystalline polyamide and about 1% by weight to about 30% by weight amorphous polyamide; a first tie layer disposed between said outer layer and said first polyamide layer; a barrier layer disposed adjacent to said first polyamide layer wherein said barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between about 27 mol % and about 42 mol %; a second polyamide layer disposed adjacent said barrier layer comprising a blend of about 70% by weight to about 99% by weight semi-crystalline polyamide and about 1% by weight to about 30% by weight amorphous polyamide; a sealant layer comprising a blend of linear low density polyethylene and low density polyethylene wherein said sealant layer comprises a greater volume percent than the outer layer; and a second tie layer disposed between said sealant layer and said second polyamide layer.
  • In addition, the package further comprises a bone-in meat product within the package and the multilayer structure may be heat-shrunk around said bone-in meat product.
  • The first and second polyamide layers each may comprise a blend of between about 85% by weight and about 99% by weight semi-crystalline polyamide and between about 1% by weight and about 15% by weight amorphous polyamide. Alternatively, the first and second polyamide layers each may comprise a blend of between about 60% by weight and about 80% by weight of a first semi-crystalline polyamide, between about 10% by weight and about 30% by of a second semi-crystalline polyamide, and between about 1% by weight and about 30% by weight amorphous polyamide. The first and second polyamide layers may comprise about an equal percent by volume of the multilayer structure.
  • In addition, the outer layer may be between about 15% by volume and about 20% by volume of the multilayer structure and the heat sealant layer may be between about 25% by volume and about 30% by volume of the multilayer structure.
  • In addition, the multilayer structure of the package of the present invention may be oriented and heat-shrinkable. Further, the multilayer structure may be annealed. Still further, the multilayer structure may be moisturized by the application of water to said multilayer structure. Moreover, the multilayer structure may be irradiated to promote crosslinking between the layers of said multilayer structure and/or within a layer of said multilayer structure. In addition, the multilayer structure may be plasticized and all the layers of the multilayer structure may be coextruded to form the multilayer structure.
  • Preferably, the multilayer structure of the package of the present invention may be between about 1 mil and about 8 mils thick. Most preferably, the multilayer structure of the package of the present embodiment may be between about 1.5 mils and about 5 mils thick. The package may further be in the form of a tube having a space therein for bone-in meat. Alternatively, the first wall may be heat-sealed to a second wall wherein the first wall and the second wall form a space for bone-in meat.
  • In another alternate embodiment of the present invention, a method of making a multilayer for packaging bone-in meat is provided. The method comprises the steps of coextruding a multilayer structure comprising an outer layer comprising a blend of linear low density polyethylene and low density polyethylene; a first polyamide layer comprising a blend of between about 70% by weight and about 99% by weight semi-crystalline polyamide and about 1% by weight to about 30% by weight amorphous polyamide; a first tie layer disposed between said outer layer and said first polyamide layer; a barrier layer disposed adjacent said first polyamide layer wherein said barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between about 27 mol % and about 42 mol %; a second polyamide layer disposed adjacent said barrier layer comprising a blend of between about 70% by weight and about 99% by weight semi-crystalline polyamide, and between about 1% by weight and about 30% by weight amorphous polyamide; a sealant layer comprising a blend of linear low density polyethylene and low density polyethylene wherein said sealant layer comprises a greater volume percent of the multilayer structure than the outer layer; and a second tie layer disposed between said sealant layer and said second polyamide layer; and biaxially orienting said multilayer structure.
  • In addition, the outer layer may be between about 15% by volume and about 20% by volume of the multilayer structure and the heat sealant layer may be between about 25% by volume and about 30% by volume of the multilayer structure.
  • The method of the present embodiment further comprises the step of annealing said multilayer structure. Still further, the method of the present embodiment comprises the step of irradiating said multilayer structure to promote crosslinking between the layers of said multilayer structure and/or within a layer of said multilayer structure. The method further comprises the step of moisturizing said multilayer structure by applying water to said multilayer structure.
  • Preferably, the multilayer structure of the method of the present embodiment may be between about 1 mil and about 8 mils thick. Most preferably, the multilayer structure of the method of the present embodiment may be between about 1.5 mils and about 5 mils thick.
  • Multilayer structures and packages made from multilayer structures are provided that can be economically and cost-effectively manufactured. More specifically, the multilayer structures can be made via coextrusion of the layers together. The multilayer structures are, therefore, easy to produce and can be made quickly and efficiently.
  • In addition, multilayer structures and packages made from the multilayer structures are provided that can be oriented, thereby providing increased strength, especially when utilized as packaging for bone-in meat products and the like.
  • Moreover, multilayer structures, methods of making the same and package made therefrom are provided wherein the multilayer structures have superior strength, durability, tear resistance and puncture resistance while being significantly thinner than known structures having comparable strength, durability, tear resistance and puncture resistance. Thinner coextruded multilayer structures have the additional advantages of having superior optical properties, such as low haze and yellowness. In addition, thinner coextruded multilayer structures have the additional advantage of being easily heat-sealable and heat-shrinkable. Still further, thinner structures contribute to the utilization of less materials, which contributes to cost efficiencies and to a reduction of waste products, both during production of the structures, and after the structures are utilized for packages. For example, the multilayer structures described herein use less materials, thereby contributing to an overall decrease in materials required to be shipped and stored. Less materials contributes to a reduction in waste products as well, thereby reducing the impact to the environment. Moreover, less boxes, pallets and warehouse space is therefore required. In addition, the decrease in materials utilized further allows more packages to be shipped and stored in specific areas, such as in truckloads and the like.
  • In addition, multilayer structures, methods of making the same, and packages made therefrom are provided wherein the multilayer structures have increased stiffness.
  • Still further, multilayer structures, methods of making the same and packages made therefrom are provided made from multilayer structures having improved durability, strength, tear resistance and puncture resistance that may be made by a coextrusion process, without needing extra series of steps for laminating other structures thereto. Therefore, multilayer structures are provided that may be formed into packages that do not have double walls or patches. In addition, the multilayer structures provided herein do not require the extra steps, time and money to precisely position patches to strengthen a structure where bony protrusions and the like may damage the structure.
  • Additional features and advantages of the present invention are described in, and will be apparent from, the detailed description of the presently preferred embodiments and from the drawing.
  • BRIEF DESCRIPTION OF THE DRAWING
  • FIG. 1 illustrates a cross-sectional view of a seven-layer structure in an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS
  • Multilayer structures, methods of making the same and packages made therefrom are provided wherein the multilayer structures are useful for packaging meat products having bony protrusions and other like products having sharp protrusions. The bony protrusions make it difficult to utilize structures without some form of reinforcing material, such as a double-walled film structure or patches or the like. However, it has been found that a multilayer coextruded structure made without double-walling or without the use of patches may be formed that has sufficient rigidity, strength, tear resistance and puncture resistance to hold bone-in meat products, while also protecting the products from the deleterious effects of oxygen.
  • The multilayer structures of the present invention typically have at least one layer of nylon and a heat-sealant layer that preferably allows the film to be heat-sealed to itself or to another film to form a package having a space therein for bone-in meat. The packages made from the multilayer structures further comprise an oxygen barrier layer to protect the product contained therein from the deleterious effects of oxygen.
  • For purposes of describing the layers of the thermoplastic multilayer barrier structures described herein, the term “inner layer” refers to the layer of a package made from the coextruded multilayer structure that directly contacts the inner space of the package and/or directly contacts the product contained therein, especially when heat-shrunk around the product, as described in more detail below. The term “outer layer” refers to a layer of the coextruded multilayer structure disposed on the external surface thereof. Specifically, if a package is made from a non-laminated coextruded structure, the outer layer is disposed on the external surface of the package.
  • Typically, the outer layer of the multilayer structures provides rigidity and strength to the film, and further provides protection from punctures, tears and the like, and is often referred to as an “abuse layer”. Materials, that may be useful in the outer layer are those typically used for abuse layers in multilayer structures, such as low density polyethylene (“LDPE”), or heterogeneous or homogeneous ethylene alpha-olefin copolymers, such as linear low density polyethylene (“LLDPE”) and medium density polyethylene (“MDPE”) made by typical polymeric processes, such as Ziegler-Natta catalysis and metallocene-based catalysis. Moreover, other ethylene copolymers may be utilized as well, such as ethylene vinyl acetate copolymer (“EVA”) and ethylene methyl acrylate copolymer (“EMA”). Other materials may include polypropylene (“PP”), polyamides, ionomers, polyesters or blends of any of these materials. In addition, an amount of slip and/or antiblock may be added to aid the outer layer in forming and to provide desirable characteristics.
  • Preferably, the outer layer comprises a blend of octene-based LLDPE and LDPE. A preferable range of LLDPE and LDPE utilized in the outer layer may be between about 50% by weight and about 90% by weight LLDPE and about 10% by weight and about 50% by weight LDPE. Most preferably, the blend of LLDPE and LDPE may be about 70% by weight LLDPE and about 30% by weight LDPE. In addition, the blend of the outer layer may comprise a small amount of antiblock and/or slip agent. Alternatively, the outer layer may comprise a polyamide or blend of polyamide materials.
  • In addition, the coextruded multilayer structures of the present invention typically have at least one internal layer. An “internal layer” is a layer disposed within a multilayer structure, and is bonded on both sides to other layers. A preferred material that is useful as an internal layer is a polyamide. Generally, polyamide materials that are useful for the at least one internal layer include, but are not limited to, nylon 6, nylon 6,69, nylon 6,66, nylon 12, nylon 6,12, nylon 6,IPD,I, amorphous polyamide, or blends of any of these materials. Preferably, the at least one internal layer is a blend of polyamide materials, such as, for example, a blend of semi-crystalline polyamide and amorphous polyamide, although amorphous polyamide is not necessary in the at least one internal layer.
  • For example, the internal layer may comprise nylon 6 or nylon 6,66 and amorphous polyamide, or a blend of nylon 6, nylon 6,69 and amorphous polyamide. It is preferable to utilize a blend of a large amount of semi-crystalline polyamide, such as about 70% by weight to about 99% by weight semi-crystalline polyamide, such as nylon 6 or nylon 6,66 or a blend of nylon 6 and nylon 6,69, with a small amount of amorphous polyamide, such as between about 1% by weight and about 30% by weight amorphous polyamide. More preferably, the internal layer may comprise about 85% by weight to about 99% by weight semi-crystalline polyamide, such as nylon 6 or nylon 6,66 or a blend of nylon 6 and nylon 6,69, with about 1% by weight to about 15% by, weight amorphous polyamide. Most preferably, the internal layer may comprise about 90% by weight to about 99% by weight semi-crystalline polyamide and about 1% by weight and about 10% by weight amorphous polyamide.
  • In addition, the polyamide layers of the present invention may comprise a blend of a first semi-crystalline polyamide, a second semi-crystalline polyamide, and an amorphous polyamide. Specifically, the polyamide layers may comprise between about 60% by weight and about 80% by weight of the first semi-crystalline polyamide, between about 10% by weight and about 30% by weight of the second semi-crystalline polyamide, and between about 1% by weight and about 30% by weight of the amorphous polyamide.
  • The blends described herein allow the internal layer of polyamide to retain softness and ease of processability while still imparting high puncture resistance, strength and stiffness to the film structure. In addition, polyamide blends comprising a small amount of amorphous polyamide have improved orientation and, therefore, shrink characteristics. Specifically, a small amount of amorphous polyamide in the polyamide blend with semi-crystalline polyamide improves both out-of-line orientation and in-line orientation.
  • Alternatively, the coextruded multilayer structures of the present invention may have a plurality of polyamide layers. For example, structures may have an outer layer comprising polyamide and an internal layer comprising polyamide. Alternatively, the structures may have two or more internal layers of polyamide. The two or more layers of polyamide may preferably be separated by an internal core layer, such as an oxygen barrier layer, as described below, and may further be useful in bonding the oxygen barrier layer to other layers within the multilayer structure. In one embodiment of the present invention, the two or more layers of polyamide may be the same polyamide. In another embodiment, the two layers may be different. Preferably, the two or more layers of polyamide are identical, such as an identical blend of semi-crystalline polyamide and amorphous polyamide.
  • Further, the internal core layer of the present invention may be a barrier layer to provide protection from oxygen that may deleteriously affect oxygen-sensitive products that may be contained within packages made by the coextruded multilayer structures of the present invention, such as bone-in meat products. Materials that may be utilized as the barrier layers of the structures include, but are not limited to, ethylene vinyl alcohol copolymer (EVOH) and EVOH blends, such as EVOH blended with polyamide, EVOH blended with polyolefin, such as LLDPE, EVOH blended with ionomer, polyglycolic acid, blends thereof and other like oxygen barrier materials. Other barrier materials may include amorphous polyamide and polyvinylidene chloride-methyl acrylate copolymer.
  • A preferable EVOH material utilized in the structures described herein has an ethylene content of between about 24 mol % and about 52 mol %. More preferably, the EVOH material utilized in the structures of the present invention have an ethylene content of between about 27 mol % and about 42 mol %. The decreased ethylene content of EVOH copolymers allows the structures to have greater barrier protection at relative humidity of less than about 93%.
  • The multilayer structures of the present invention may further have a heat-sealant layer that may form heat-seals when heat and/or pressure is applied to the package. For example, the structures of the present invention may be folded over onto themselves and sealed around edges to create a package with the bone-in meat products contained therein. Alternatively, the structures may be formed as a tube, whereby ends of the tube may be heat-sealed together to create a package for the product. Moreover, a first structure of the present invention may be disposed adjacent a second structure of the present invention and sealed around edges of the structures to form a package for the bone-in meat or other like products.
  • The heat-sealant layer materials include, but are not limited to, various polyolefins, such as low density polyethylene, linear low density polyethylene and medium density polyethylene. The polyethylenes may be made via a single site catalyst, such as a metallocene catalyst, or a Ziegler-Natta catalyst, or any other polyolefin catalyst system. In addition, other materials include, but are not limited to, polypropylene, ionomer, propylene-ethylene copolymer or blends of any of these materials. Further, acid modified polyolefins and tie resins or concentrates, such as, for example, anhydride modified polyethylene, may be utilized in the heat sealant layer, which may be useful for meat adhesion when the multilayer structure is heat shrunk about a bone-in meat product.
  • In addition, slip and/or antiblock may be added to the polymeric material to aid in processability and for other desirable characteristics. Preferably, the heat-sealant layer of the structure of the present invention may comprise a blend of octene-based linear low density polyethylene and low density polyethylene. More specifically, the heat-sealant layer may comprise between about 50% by weight and about 90% by weight LLDPE and between about 10% by weight and about 50% by weight LDPE. Most specifically, the heat-sealant layer comprises about 70% by weight LLDPE and about 30% by weight LDPE. Optionally, the heat-sealant layer comprises a small amount of slip and/or antiblock.
  • The above-identified materials may be combined into a structure having at least three layers that has sufficient puncture resistance, strength and optical properties to form packages that are useful for packaging bone-in meat or other like products.
  • The coextruded multilayer structures of the present invention are preferably coextruded and biaxially oriented via a double bubble process, whereby each layer of each of the multilayer structures is coextruded as a bubble and then cooled. Typical cooling processes include air cooling, water cooling or cooling via non-contact vacuum sizing. The coextruded multilayer structures may then be reheated and oriented in both the longitudinal and transverse directions. Alternatively, the coextruded multilayer structures of the present invention may be oriented via other orienting processes, such as tenter-frame orientation.
  • The oriented multilayer structures are then heated to an annealing temperature and cooled while the multilayer structures maintain their oriented dimensions in a third bubble, thereby annealing the multilayer structures to relax residual stress and provide stability and strength to the multilayer structures while maintaining the heat shrinkability and superior optical characteristics of oriented multilayer structures. Use of a third bubble for purposes of annealing the oriented structures is often referred to as a triple-bubble process. The structures of the present invention may be partially or completely annealed. Annealing the multilayer structure allows for precise control over the degree of shrink and/or over the stability of the multilayer structure, and is typically done at a temperature between room temperature and the anticipated temperature at which the multilayer structure is desired to shrink.
  • In addition, the multilayer structures of the present invention may be further processed to get desirable characteristics. For example, multilayer structures of the present invention may be cross-linked via known cross-linking processes, such as by electron-beam cross-linking either before or after orientation of the multilayer structure. Cross-linking may occur between layers (“inter-layer crosslinking”) of the structures or molecularly within at least one layer of a structure (“molecular cross-linking”). For example, molecular cross-linking of EVOH occurs at about 6 megarads, which provides increased stiffness and barrier properties of the EVOH in the structures. Of course, any other radiation dosage may be utilized to promote inter-layer cross-linking or molecular cross-linking as may be apparent to one having ordinary skill in the art. In addition, the structures may be moisturized, by exposing the surfaces of the structures to water so that certain layers of the structures, such as the polyamide layers, absorb the water thus plasticizing the polyamide layers, thereby making the polyamide layers softer and stronger. Moisturizing the structures typically occurs by exposing the surface of the structures to water, such as a mist, prior to rolling the structures for storage. During storage of the structures, the water is absorbed by the layers of the structures, such as the polyamide layers, thereby plasticizing the structure. Of course, other methods for plasticizing the structures are contemplated by the present invention, and the invention should not be limited as described herein.
  • Preferably, the structures of the present invention have a thickness of between about 1 and about 8 mils. Most preferably, the structures of the present invention have a thickness of between about 1.5 mils and about 5 mils A balance must be reached between having a cost-effective package, thereby minimizing the thickness of the structures, and having a package that provides adequate puncture and tear resistance for bone-in meat or other like products. It is believed that a combination of materials used in the structures contributes to the advantageous properties of the structures of the present invention, such as puncture resistance, strength, durability, and optical properties, without requiring relatively thick structures.
  • The structures of the present invention are utilized to make heat shrinkable bags, such as by coextruding heat shrinkable tubes, cutting said tubes to the desired sizes, placing product within said tubes, sealing the open ends of the tubes, and heat-shrinking the tubes around the products. Alternatively, packages may be made by folding structures so that the heat-sealant layers of the structures are in face-to-face contact. In addition, packages may be made by heat-sealing first walls of first multilayer structures to second walls of second multilayer structures to form a space for a product to be contained therein. Of course, any other method of making said packages are contemplated by the present invention. Machinery contemplated as being used to make the bags or packages of the present invention include intermittent motion bag-making machines, rotary bag-making machines, or multibaggers, which are described in U.S. Pat. No. 6,267,661 to Melville, the disclosure of which is expressly incorporated herein in its entirety.
  • In a typical bag-making process, tubes are produced using a double-bubble or a triple-bubble process, as described above. The surfaces of the tubes may be lightly dusted with starch. An open end of the tube is then heat-sealed with one end of the tube left open for adding the product to the package. Other types of packages and uses are contemplated by the present invention, such as vertical form, fill and seal packages and lidstock for rigid or semi-rigid trays. In addition, the structures of the present invention may be useful as cook-in bags or the like.
  • The tubes then have product placed therein, such as bone-in meat. The tubes are then evacuated of air and the open end of each is heat-sealed. The tubes that have been evacuated of air and heat-sealed are then shrunk around the product by sending the tubes through an oven, a hot water tunnel or other similar heat-shrink apparatus.
  • As noted above, the structures of the present invention may have at least three layers, but preferably contain four, five, six or more layers. Most preferably, the structures comprise seven layers. In addition, structures having greater than seven layers are contemplated by the present invention. Each structure preferably has a heat-sealant layer, a polyamide layer, and a barrier layer of, preferably, EVOH copolymer. Moreover, it is preferable to have at least two layers of polyamide contained within each of the structures disposed on opposite sides of the barrier layer thereby bonding the barrier layer to the other layers within each of the multilayer structures.
  • The following non-limiting examples illustrate five-layer structures of the present invention:
  • Example 1
  • Percent by volume Materials and Structure Layer of structure percent by weight of layer 1 (Outer layer) 45 80% Nylon 6 20% amorphous polyamide 2 (Barrier layer) 5 100% EVOH (32 mol % ethylene content) 3 (Polyamide 35 90% Nylon 6 layer) 10% amorphous polyamide 4 (Tie layer) 5 100% anhydride modified LLDPE 5 (Sealant layer) 10 50% LLDPE 50% LDPE
  • Example 2
  • Percent by volume Materials and Structure Layer of structure percent by weight of layer 1 (Outer layer) 45 80% Nylon 6 20% amorphous polyamide 2 (Barrier layer) 5 100% EVOH (44 mol % ethylene content) 3 (Polyamide 35 90% Nylon 6 layer) 10% amorphous polyamide 4 (Tie layer) 5 100% anhydride modified LLDPE 5 (Sealant layer) 10 50% LLDPE 50% LDPE
  • Examples 1-2 illustrate five-layer structures of the present invention. Specifically, the five-layer structures each comprise an outer layer of polyamide, a barrier layer of EVOH copolymer, an internal layer of polyamide, such that the outer layer of polyamide and the internal layer of polyamide are disposed adjacent to the barrier layer of EVOH copolymer. A tie layer is disposed adjacent to the internal layer of polyamide, which binds the internal layer of polyamide to the heat-sealant layer, comprising a blend of LLDPE and LDPE. The 5-layer structures of Examples 1 and 2 were about 4.1 mils thick.
  • Example 3
  • Example 3 includes the 5-layer structure of Example 2 that was moisturized by the application of water to the structure, thereby plasticizing the structure. Specifically, the water was applied as a mist or spray to the 5-layer structure of Example 2, and the 5-layer structure of Example 2 was wound on a roll and the water was allowed to penetrate the film structure to plasticize the film structure, specifically the polyamide layers. The 5-layer moisturized structure of Example 3 was about 5.6 mils thick.
  • Table 1 illustrates comparative test data for Examples 1-3,
  • TABLE 1 Test Ex. 1 Ex. 2 Ex. 3 Caliper (mil) 4.1 4.1 5.6 45° Gloss (units) 90.2 92.2 70.1 Haze (%) 4.0 3.6 9.0 Yellowness Index 1.1 1.1 1.1 MD Secant Modulus (psi) 237,900 243,900 32,200 CD Secant Modulus (psi) 250,800 246,800 36,400 Puncture Resistance (lb/mil) 21.2 22.2 11.5 MD Free Shrink @ 200° F. 19 18 19 CD Free Shrink @ 200° F. 28 28 20 OTR @ 73° F./0% RH 0.8 2.4 (cc/m2/day/atm)
  • In a preferred embodiment of the present invention, seven-layer coextruded structures are provided, as illustrated in FIG. 1. The structures preferably comprise a first outer layer 10, a first tie layer 12, a first polyamide layer 14, a barrier layer 16, a second polyamide layer 18, a second tie layer 20 and a heat-sealant layer 22. Each of the layers is described in more detail below.
  • The outer layer 10 of the seven-layer structure illustrated in FIG. 2 provides rigidity and strength to the structure, and further provides protection from scratches, tears and the like. Preferably, the outer layer 10 is between about 5% by volume and about 25% by volume of the entire structure. Most preferably, the outer layer 10 comprises about 17.5% by volume of the entire structure.
  • The multilayer structures of the present invention may further comprise tie layers disposed between other layers of the multilayer structures. Specifically, a “tie layer” is defined as an internal layer that provides adhesion or bonding to two layers of a coextruded structure and is typically disposed adjacent to and between the two layers of the coextruded structure. The multilayer structure 1 described with reference to FIG. 1 may include a first tie layer 12 and a second tie layer 20, which are disposed adjacent the outer layer 10 and the heat-sealant layer 22, respectively. The first and second tie layers may be utilized to bind the outer layer 10 and the heat-sealant layer 22 to other internal layers, such as the first polyamide layer 14 and/or second polyamide layer 18. The first tie layer 12 and/or second tie layer 20 may comprise modified polyolefins, such as maleic anhydride modified polyolefins. Polyolefins useful as the first tie layer 12 and/or the second tie layer 20 of the present invention include, but are not limited to, anhydride modified linear low density polyethylene or any other maleic anhydride modified polyolefin polymer or copolymer, such as anhydride modified ethylene-vinyl acetate copolymer and/or anhydride modified ethylene methyl acrylate copolymer. Alternatively, the first tie layer 12 and/or the second tie layer 20 may comprise a material that is not typically utilized as a tie resin. Specifically, the first tie layer 12 and/or the second tie layer 20 may comprise materials that are not modified with maleic anhydride, such as ethylene vinyl acetate copolymer and ethylene methyl acrylate copolymer. Other polymeric materials that may be useful as tie layers include, but are not limited to, acid terpolymer comprising ethylene, acrylic acid and methyl acrylate, polyamide, and polystyrene block copolymers. In addition, the first tie layer 12 and/or the second tie layer 20 may comprise blends of tie resins with other polymeric material, such as polyolefins or the like.
  • Preferably, the first tie layer 12 and/or the second tie layer 20 comprise a maleic anhydride modified ethylene methyl acrylate copolymer, such as, for example, BYNEL® from DuPont. Most preferably, the first tie layer comprises maleic anhydride modified linear low density polyethylene, such as, for example, ADMER® from Mitsui. It should be noted that the first tie layer 12 and the second tie layer 20 may not be the same material, but may be different materials that are useful for tying together the outer layer 10 to an internal layer of polyamide and/or the sealant layer 22 to an internal layer of polyamide. Although the first tie layer 12 and second tie layer 20 may be any thickness useful for the present invention, it is preferable that the first tie layer 12 and second tie layer 20 each comprise between about 2% by volume and about 15% by volume of the multilayer structures. Most preferably, the first tie layer 12 and/or the second tie layer 20 each comprise about 5% by volume of the entire multilayer structures.
  • The first polyamide layer 14 and/or second polyamide layer 18 may be utilized to protect the barrier layer 16, and to provide rigidity and strength to structures made from the present invention. The polyamide layers further provide ease of orientation, better shrink force and lower oxygen transmission rates through the multilayer structure. It should be noted that the first polyamide layer 14 and second polyamide layer 18 may not be the same material, and may be different depending on the desired characteristics of the structures. In addition, each of the first polyamide layer 14 and/or second polyamide layer 18 of the seven layer structures may be between about 10% by volume and about 60% by volume of the structures More specifically, each of the polyamide layers of the seven layer structures may be between about 10% by volume and about 40% by volume of the structures. Most preferably, each of the polyamide layers of the seven layer structures may be between about 15% and about 25% by volume of the structures.
  • Both the first polyamide layer 14 and second polyamide layer 18 may together comprise between about 20% by volume and about 80% by volume of the structures. More specifically, both the first polyamide layer 14 and second polyamide layer 18 may together comprise between about 30% by volume and about 50% by volume of the structures. Most preferably, both of the first polyamide layer 14 and second polyamide layer 18 may together comprise about 40% by volume of the film. While it is preferable that the two polyamide layers 14, 18 be of the same thickness, this is not necessary, and the first polyamide layer 14 and the second polyamide layer 18 may be different thicknesses.
  • The heat-sealant layer 22 of the seven layer structure illustrated in FIG. 1 may be any thickness. Preferably, the heat-sealant layer may comprise between about 20% by volume and about 30% by volume of the entire structure. Most preferably, the heat-sealant layer 22 of the present invention may comprise about 27.5% by volume of the entire structure, especially when the outer layer 10 comprises about 17.5% by volume of the entire structure. It is further preferable that the outer layer 10 and the heat-sealant layer 22 comprise different amounts of polymeric material, thereby creating an unbalanced structure. If the outer layer 10 is thinner than the heat-sealant layer 22, then the entire structure will be thinner, thereby allowing a heat-sealing mechanism such as a heat-sealing bar, to heat the sealant layer 22 and more easily and effectively melt the sealant layer 22 to form a heat-seal. In addition, having more polymeric material in the heat-sealant layer 22 allows the heat-sealant layer 22 to more easily melt and flow, thereby forming a strong seal when heat-sealed to another structure or to itself.
  • The seven-layer structures of the present invention, as described above and illustrated in FIG. 1, are preferably coextruded and oriented thereby producing structures that are heat shrinkable. The total orientation factor of the seven-layer structures are preferably between about 6 and about 20. More preferably, the total orientation factor is between about 8 and about 13. The structures of the present invention may further be partially or completely annealed, preferably at a temperature of between room temperature and the temperature at which the structure is heat shrunk. Annealing the structures stabilizes the structures by removing residual stresses within the oriented structures. Typically, the structures are maintained in a third bubble and heated above their annealing temperatures, which allows residual stresses in the oriented structures to relax, thereby providing more stable multilayer structures.
  • The following examples illustrate specific embodiments of seven layer structures:
  • Example 4
  • Percent by volume Materials and percent by Structure Layer of structure weight of structure layer 1 (Outer) 22.5 49% LLDPE 49% LDPE 2% blend of slip and antiblock 2 (First Tie) 5.0 100% anhydride modified LLDPE 3 (First 20.0 70% nylon 6 Polyamide) 25% nylon 6,69 5% amorphous polyamide 4 (Barrier) 5.0 100% EVOH (48 mol % ethylene content) 5 (Second 20.0 70% nylon 6 Polyamide) 25% nylon 6,69 5% amorphous polyamide 6 (Second Tie) 5.0 100% anhydride modified LLDPE 7 (Sealant) 22.5 49% LLDPE 49% LDPE 2% blend of slip and antiblock
  • The seven layer structure of Example 4 was made by coextruding the seven layers together and biaxially orienting the resulting structure. The seven layer structure has a total orientation factor of about 11.7. Further, the structure was annealed to stabilize the structure. The coextrusion, orientation, and annealing of the seven layer structure of Example 4 were completed in a triple bubble process. The final structure thickness was about 3.3 mils.
  • Example 5
  • Percent by volume Materials and percent by Structure Layer of structure weight of structure layer 1 (Outer) 17.5 49% LLDPE 49% LDPE 2% blend of slip and antiblock 2 (First Tie) 5.0 100% anhydride modified LLDPE 3 (First 20.0 70% nylon 6 Polyamide) 25% nylon 6,69 5% amorphous polyamide 4 (Barrier) 5.0 100% EVOH (48 mol % ethylene content) 5 (Second 20.0 70% nylon 6 Polyamide) 25% nylon 6,69 5% amorphous polyamide 6 (Second Tie) 5.0 100% anhydride modified LLDPE 7 (Sealant) 27.5 49% LLDPE 49% LDPE 2% blend of slip and antiblock
  • The seven-layer structure of Example 5 was made by coextruding the seven layers together and biaxially orienting the structure. The structure had a total orientation factor of about 11.4. In addition, the seven-layer structure of Example 5 was annealed to stabilize the final structure. The coextrusion, orientation, and annealing of the seven layer structure of Example 5 were completed in a triple bubble process. The final structure thickness was about 3.7 mils.
  • This structure of Example 5 is similar to the structure described in Example 4, except that the structure, of Example 5 contains differing amounts of materials in the outer layer and the heat-sealant layer thereby creating an unbalanced structure. Specifically, the outer layer comprises about 17.5% by volume of the structure, and the sealant layer comprises about 27.5% by volume of the structure.
  • Example 6
  • Percent by volume Materials and percent by Structure Layer of structure weight of structure layer 1 (Outer) 15.0 49% LLDPE 49% LDPE 2% blend of slip and antiblock 2 (First Tie) 5.0 100% anhydride modified LLDPE 3 (First 25.0 70% nylon 6 Polyamide) 25% nylon 6,69 5% amorphous polyamide 4 (Barrier) 5.0 100% EVOH (48 mol % ethylene content) 5 (Second 25.0 70% nylon 6 Polyamide) 25% nylon 6,69 5% amorphous polyamide 6 (Second Tie) 5.0 100% anhydride modified LLDPE 7 (Sealant) 20.0 49% LLDPE 49% LDPE 2% blend of slip and antiblock
  • The seven-layer structure of Example 6 was made by coextruding the seven layers together and biaxially orienting the structure. The structure had a total orientation factor of about 9.1. In addition, the seven layer structure of Example 6 was annealed to stabilize the final structure. The coextrusion, orientation, and annealing of the seven layer structure of Example 6 were completed in a triple bubble process. The final structure thickness was about 3.9 mils.
  • The seven-layer structure of Example 6 is similar to the seven-layer structure of Example 5, including differing amounts of materials in the outer layer and the heat-sealant layer. However, the structure of Example 6 includes more polyamide material than the structure of Example 5. More specifically, each polyamide layer in the structure of Example 6 comprises about 25% by volume of the structure. The entire structure comprises about 50% by volume total of polyamide.
  • Example 7
  • Percent by volume Materials and percent by Structure Layer of structure weight of structure layer 1 (Outer) 17.5 49% LLDPE 49% LDPE 2% blend of slip and antiblock 2 (First Tie) 5.0 100% anhydride modified LLDPE 3 (First 20.0 70% nylon 6 Polyamide) 25% nylon 6,69 5% amorphous polyamide 4 (Barrier) 5.0 100% EVOH (32 mol % ethylene content) 5 (Second 20.0 70% nylon 6 Polyamide) 25% nylon 6,69 5% amorphous polyamide 6 (Second Tie) 5.0 100% anhydride modified LLDPE 7 (Sealant) 27.5 49% LLDPE 49% LDPE 2% blend of slip and antiblock
  • The seven-layer structure of Example 7 was made by coextruding the seven layers together and biaxially orienting the structure. The structure had a total orientation factor of about 11.2. In addition, the seven-layer structure of Example 7 was annealed to stabilize the final structure. The coextrusion, orientation, and annealing of the seven layer structure of Example 7 were completed in a triple bubble process. The final structure thickness was about 3.7 mils.
  • The seven-layer structure of Example 7 is almost identical to the seven-layer structures of Example 5, except that the core layer comprises EVOH having an ethylene content of about 32 mol %, as opposed to about 48 mol %, as shown above with respect to Example 5.
  • Example 8
  • Percent by volume Materials and percent by Structure Layer of structure weight of structure layer 1 (Outer) 17.5 49% LLDPE 49% LDPE 2% blend of slip and antiblock 2 (First Tie) 5.0 100% anhydride modified LLDPE 3 (First 20.0 92% nylon 6 Polyamide) 8% amorphous polyamide 4 (Barrier) 5.0 100% EVOH (38 mol % ethylene content) 5 (Second 20.0 92% nylon 6 Polyamide) 8% amorphous polyamide 6 (Second Tie) 5.0 100% anhydride modified LLDPE 7 (Sealant) 27.5 49% LLDPE 49% LDPE 2% blend of slip and antiblock
  • The seven-layer structure of Example 8 was made by coextruding the seven layers together and biaxially orienting the structure. In addition, the seven-layer structure of Example 8 was annealed to stabilize the final film. The coextrusion, orientation, and annealing of the seven layer structure of Example 8 were completed in a triple bubble process. The final structure thickness was about 4.0 mils. Each of the polyamide layers of the seven layer structure of Example 8 comprises a blend of about 92% by weight nylon 6 and about 8% by weight amorphous polyamide.
  • Example 9
  • Percent by volume Materials and percent by Structure Layer of structure weight of structure layer 1 (Outer) 17.5 69% LLDPE 29% LDPE 2% blend of slip and antiblock 2 (First Tie) 5.0 100% anhydride modified LLDPE 3 (First 20.0 92% nylon 6 Polyamide) 8% amorphous polyamide 4 (Barrier) 5.0 100% EVOH (32 mol % ethylene content) 5 (Second 20.0 92% nylon 6 Polyamide) 8% amorphous polyamide 6 (Second Tie) 5.0 100% anhydride modified LLDPE 7 (Sealant) 27.5 68% LLDPE 27.25% LDPE 4.75% blend of slip, antiblock, anti-oxidant, and polymer processing aid
  • The seven-layer structure of Example 9 was made by coextruding the seven layers together and biaxially orienting the structure. In addition, the seven-layer structure of Example 9 was annealed to stabilize the final film. The coextrusion, orientation, and annealing of the seven layer structure of Example 9 were completed in a triple bubble process. The final structure thickness was about 4.0 mils. Each of the polyamide layers of the seven layer structure of Example 9 comprises a blend of about 92% by weight nylon 6 and about 8% by weight amorphous polyamide.
  • Table 2 provide comparative test data for each of the Examples 4-9:
  • TABLE 2 Test Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9 Caliper (mil) 3.6 3.4 3.5 3.7 4.0 3.85 45° Gloss (units) 72.6 72.5 46 69.8 72.8 71.4 Haze (%) 7.8 10 25.7 9.6 7.9 8.6 Yellowness Index 0.16 0.19 0.12 0.20 0.22 0.13 MD Secant Modulus (psi) 111,500 130,400 145,200 132,700 131,900 121,500 CD Secant Modulus (psi) 120,300 131,900 160,000 144,800 157,400 156,000 Puncture Resistance (lb/mil) 16.8 17.9 21.9 14.5 18.2 15.3 MD Free Shrink @200° F. 24 25 26 26 24 28 CD Free Shrink @200° F. 30 29 35 30 29 29 OTR @ 73° F./0% RH 11.3 14.4 11.2 1.8 2.0 3.1 (cc/m2/day/atm)
  • It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages. It is, therefore, intended that such changes and modifications be covered by the appended claims.

Claims (30)

1-40. (canceled)
41. A method of packaging a bone-in meat product, comprising:
obtaining a multilayer structure comprising:
a first polyamide layer;
a barrier layer disposed adjacent to the first polyamide layer, wherein the barrier layer comprises ethylene vinyl alcohol copolymer;
a second polyamide layer disposed adjacent the barrier layer; and
a sealant layer;
wherein the multilayer structure does not comprise a double wall or patch; and
heat shrinking the multilayer structure around a bone-in meat product.
42. The method of claim 41, wherein the heat shrinking step comprises:
heat shrinking the multi-layer structure around the bone-in meat product such that a bone of the bone-in meat product protrudes from the meat and contacts the multilayer structure.
43. The method of claim 41, wherein the multilayer structure further comprises an outer layer comprising polyethylene.
44. The method of claim 43, where the multilayer structure further comprises:
a first tie layer disposed between the outer layer and the first polyamide layer; and a second tie layer disposed between the sealant layer and the second polyamide layer.
45. The method of claim 41, wherein the first polyamide layer comprises a blend of semi-crystalline polyamide and amorphous polyamide.
46. The method of claim 45, wherein the second polyamide layer comprises a blend of semi-crystalline polyamide and amorphous polyamide.
47. The method of claim 41, wherein the barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between 24 mol % and 52 mol %.
48. The method of claim 41, wherein the sealant layer comprises polyethylene.
49. The method of claim 41, wherein the multilayer structure is biaxially oriented.
50. The method of claim 49, wherein the multilayer structure comprises a total orientation factor of between 6 and 20.
51. The method of claim 41, wherein both the first polyamide layer and the second polyamide layer together comprise between 20% by volume and 80% by volume of the multilayer structure.
52. A method of packaging a bone-in meat product, comprising:
obtaining a multilayer structure comprising:
an outer layer comprising polyethylene;
a first polyamide layer;
a barrier layer disposed adjacent to the first polyamide layer, wherein the barrier layer comprises ethylene vinyl alcohol copolymer;
a second polyamide layer disposed adjacent the barrier layer; and
a sealant layer;
wherein the multilayer structure does not comprise a double wall or patch, and wherein the multilayer structure is biaxially oriented; and
heat shrinking the multilayer structure around a bone-in meat product.
53. The method of claim 52, wherein the heat shrinking step comprises:
heat shrinking the multi-layer structure around the bone-in meat product such that a bone of the bone-in meat product protrudes from the meat and contacts the multilayer structure.
54. The method of claim 52, where the multilayer structure further comprises:
a first tie layer disposed between the outer layer and the first polyamide layer; and a second tie layer disposed between the sealant layer and the second polyamide layer.
55. The method of claim 52, wherein the first polyamide layer comprises a blend of semi-crystalline polyamide and amorphous polyamide.
56. The method of claim 55, wherein the second polyamide layer comprises a blend of semi-crystalline polyamide and amorphous polyamide.
57. The method of claim 52, wherein the barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between 24 mol % and 52 mol %.
58. The method of claim 52, wherein the sealant layer comprises polyethylene.
59. The method of claim 52, wherein the multilayer structure comprises a total orientation factor of between 6 and 20.
60. The method of claim 52, wherein both the first polyamide layer and the second polyamide layer together comprise between 20% by volume and 80% by volume of the multilayer structure.
61. A method of packaging a bone-in meat product, comprising:
obtaining a multilayer structure comprising:
a first polyamide layer;
a barrier layer comprising ethylene vinyl alcohol copolymer;
a second polyamide layer; and
a sealant layer;
wherein the multilayer structure is biaxially oriented and does not comprise a double wall or patch, and wherein both the first polyamide layer and the second polyamide layer together comprise between 20% by volume and 80% by volume of the multilayer structure; and
heat shrinking the multilayer structure around a bone-in meat product such that a bone of the bone-in meat product protrudes from the meat and contacts the multilayer structure.
62. The method of claim 61, wherein the multilayer structure further comprises an outer layer comprising polyethylene.
63. The method of claim 62, where the multilayer structure further comprises:
a first tie layer disposed between the outer layer and the first polyamide layer; and a second tie layer disposed between the sealant layer and the second polyamide layer.
64. The method of claim 61, wherein the first polyamide layer comprises a blend of semi-crystalline polyamide and amorphous polyamide.
65. The method of claim 64, wherein the second polyamide layer comprises a blend of semi-crystalline polyamide and amorphous polyamide.
66. The method of claim 61, wherein the barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between 24 mol % and 52 mol %.
67. The method of claim 61, wherein the sealant layer comprises polyethylene.
68. The method of claim 61, wherein the multilayer structure comprises a total orientation factor of between 6 and 20.
69. A package comprising a multilayer structure and a bone-in meat product, the multilayer structure comprising:
a first polyamide layer;
a barrier layer disposed adjacent to the first polyamide layer, wherein the barrier layer comprises ethylene vinyl alcohol copolymer;
a second polyamide layer disposed adjacent the barrier layer; and
a sealant layer;
wherein the multilayer structure does not comprise a double wall or patch; and
wherein the multilayer structure is heat shrunk around the bone-in meat product.
US15/297,909 2003-03-07 2016-10-19 Multilayer barrier structures, methods of making the same and packages made therefrom Pending US20170036426A1 (en)

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Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040175466A1 (en) 2003-03-07 2004-09-09 Douglas Michael J. Multilayer barrier structures, methods of making the same and packages made therefrom
US20040175464A1 (en) 2003-03-07 2004-09-09 Blemberg Robert J. Multilayer structures, packages, and methods of making multilayer structures
CA2589758A1 (en) 2004-12-10 2006-06-15 Thomas A. Schell Multilayer packaging barrier films comprising ethylene vinyl alcohol copolymers
WO2006116389A2 (en) * 2005-04-25 2006-11-02 Advanced Technology Materials, Inc. Material storage and dispensing packages and methods
US20070092744A1 (en) * 2005-10-13 2007-04-26 Plasticos Dise S.A. Polymer compositions and films and method of making
US8522978B2 (en) * 2006-12-01 2013-09-03 Cryovac, Inc. Stress concentrator for opening a flexible container
US7744806B2 (en) * 2007-01-29 2010-06-29 Cryovac, Inc. Process for making shrink film comprising rapidly-quenched semi-crystalline polyamide
US7687123B2 (en) * 2007-01-29 2010-03-30 Cryovac, Inc. Shrink film containing semi-crystalline polyamide and process for making same
US20080182051A1 (en) * 2007-01-29 2008-07-31 Cryovac, Inc. Heat shrinkable retortable packaging article and process for preparing retorted packaged product
US10202229B2 (en) 2007-05-21 2019-02-12 Cryovac, Inc. Easy opening packaging article made from heat-shrinkable film exhibiting directional tear
US10189621B2 (en) * 2007-05-21 2019-01-29 Cryovac, Inc. Bag made from high-strength heat-shrinkable film exhibiting directional tear, and process utilizing same
US7980272B2 (en) * 2007-06-21 2011-07-19 Samsung Electronics Co., Ltd. Microfluidic valve, method of manufacturing the same, and microfluidic device comprising the microfluidic valve
US20100015423A1 (en) * 2008-07-18 2010-01-21 Schaefer Suzanne E Polyamide structures for the packaging of moisture containing products
KR101333579B1 (en) 2010-12-15 2013-11-28 제일모직주식회사 Polyamide Resin Composition Having Good Reflectance, Heat resistance, and Humidity resistance
EP2610313B1 (en) * 2011-12-29 2017-05-31 Lotte Advanced Materials Co., Ltd. Polyamide resin composition having improved physical properties including thin-wall moldability
US9522496B2 (en) * 2012-12-04 2016-12-20 Pexcor Manufacturing Company Inc. Production method of plastic pipe in layers
KR101566063B1 (en) 2012-12-31 2015-11-04 제일모직주식회사 Thermoplastic Resin Composition Having Excellent Surface Gloss, Reflectance, Anti-yellowing property and Moldability
KR20140099138A (en) 2013-02-01 2014-08-11 제일모직주식회사 Polyamide Resin Composition Having Excellent Photostability and Discoloration Resistance
CN105517919B (en) * 2013-08-02 2018-01-16 罗盖特公司 Flexible storage device, its manufacture method and application thereof including flexible container and liner
US10301449B2 (en) 2013-11-29 2019-05-28 Lotte Advanced Materials Co., Ltd. Thermoplastic resin composition having excellent light stability at high temperature
US9840610B2 (en) 2014-09-30 2017-12-12 Lotte Advanced Materials Co., Ltd. Thermoplastic resin composition and molded article using the same
KR101849830B1 (en) 2015-06-30 2018-04-18 롯데첨단소재(주) Polyester resin composition with excellent impact resistance and light reliability and molded article using the same
USD809116S1 (en) 2015-11-02 2018-01-30 Pura Scents Dispenser
AT519653B1 (en) * 2017-02-09 2018-09-15 Constantia Hueck Folien Gmbh & Co Kg Composite film with a mineral oil barrier

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278738A (en) * 1978-03-10 1981-07-14 W. R. Grace & Co. Ethylene-vinyl acetate copolymer film laminate
US5545419A (en) * 1994-07-21 1996-08-13 W. R. Grace & Co.-Conn. Patch bag having supplemental seal
US5562996A (en) * 1990-06-27 1996-10-08 Gunze Limited Multi-layer films
US6068933A (en) * 1996-02-15 2000-05-30 American National Can Company Thermoformable multilayer polymeric film
US6221470B1 (en) * 1996-02-23 2001-04-24 Cryovac, Inc. Multilayer oxygen barrier packaging film
US6274228B1 (en) * 1998-07-22 2001-08-14 Cryovac, Inc. Heat-shrinkable film with improved inter-ply adhesion

Family Cites Families (211)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2664358A (en) 1951-01-26 1953-12-29 Edwin H Eichler Canning whole food articles
US3456044A (en) * 1965-03-12 1969-07-15 Heinz Erich Pahlke Biaxial orientation
US3694231A (en) 1970-08-17 1972-09-26 Gentry Corp Process for preparing shelf-stable,free-flowing dehydrated cheese products in granulated or powdered form
US3741253A (en) * 1971-03-30 1973-06-26 Grace W R & Co Laminates of ethylene vinyl acetate polymers and polymers of vinylidene chloride
US3997383A (en) * 1975-03-10 1976-12-14 W. R. Grace & Co. Cross-linked amide/olefin polymeric laminates
ES448091A1 (en) * 1975-05-22 1977-07-01 Grace W R & Co Process for improving the resistance deslaminacionde stretched laminate films.
US4178401A (en) * 1978-01-09 1979-12-11 W. R. Grace & Co. Packaging film comprising a blended self-welding layer
JPS6043318B2 (en) 1978-07-18 1985-09-27 Fuji Photo Film Co Ltd
US4457960A (en) * 1982-04-26 1984-07-03 American Can Company Polymeric and film structure for use in shrink bags
DE3227945C2 (en) * 1982-07-27 1986-07-24 Naturin-Werk Becker & Co, 6940 Weinheim, De
US4469742A (en) * 1983-01-31 1984-09-04 W. R. Grace & Co., Cryovac Div. Pasteurizable, cook-in shrink film
DE3306189A1 (en) 1983-02-23 1984-08-23 Hoechst Ag Multi-layer film with a gas and aroma barrier layer, process for their production and their use
US4501798A (en) 1983-05-05 1985-02-26 American Can Company Unbalanced oriented multiple layer film
US5020922A (en) * 1983-06-30 1991-06-04 W. R. Grace & Co.-Conn. Bone puncture resistant bag
US4704101A (en) * 1983-06-30 1987-11-03 W.R. Grace & Co., Cryovac Div. Method for making a puncture resistant bag
JPH037933B2 (en) 1983-07-20 1991-02-04 Fuji Photo Film Co Ltd
US4534984A (en) * 1983-08-16 1985-08-13 W. R. Grace & Co., Cryovac Div. Puncture-resistant bag and method for vacuum packaging bone-in meat
US4576844A (en) 1983-11-28 1986-03-18 C-I-L Inc. Shipping bag
US5069955A (en) 1983-12-06 1991-12-03 American National Can Company Film and blends of polyetheramide block copolymer and ethylene vinyl alcohol
US4561920A (en) * 1984-02-08 1985-12-31 Norchem, Inc. Formerly Northern Petrochemical Company Biaxially oriented oxygen and moisture barrier film
CA1240247A (en) 1984-06-08 1988-08-09 Matthew Koschak Unbalanced oriented multiple layer film
US4765857A (en) * 1985-06-03 1988-08-23 W. R. Grace & Co., Cryovac Div. Protective patch for shrinkable bag
US4770731A (en) * 1985-06-03 1988-09-13 W. R. Grace & Co.-Conn. Method of making a patch for a shrinkable bag
US4755403A (en) * 1985-06-03 1988-07-05 W. R. Grace & Co., Cryovac Div. Protective patch for shrinkable bag
US4724185A (en) * 1985-09-17 1988-02-09 W. R. Grace & Co., Cryovac Div. Oxygen barrier oriented film
NZ217626A (en) * 1985-09-30 1989-11-28 W R Grace & Co Conn Formerly W Packaging film consisting of #a# olefin copolymers
USRE35285E (en) * 1985-09-30 1996-06-25 W. R. Grace & Co.-Conn. Thermoplastic multi-layer packaging film and bags made therefrom
WO1987002933A1 (en) 1985-11-07 1987-05-21 Showa Denko Kabushiki Kaisha Transparent high-density polyethylene film and process for its production
US4746562A (en) * 1986-02-28 1988-05-24 W. R. Grace & Co., Cryovac Div. Packaging film
US4753700A (en) * 1986-02-28 1988-06-28 W. R. Grace & Co., Cryovac Div. Packaging film
US4755419A (en) * 1986-03-21 1988-07-05 W. R. Grace & Co., Cryovac Div. Oxygen barrier oriented shrink film
US5004647A (en) * 1986-03-21 1991-04-02 W. R. Grace & Co.-Conn. Oxygen barrier biaxially oriented film
US4668571A (en) * 1986-05-02 1987-05-26 The Dow Chemical Company Coextrustion tie layer and process for producing such tie layer
US4729926A (en) 1986-05-16 1988-03-08 W. R. Grace & Co., Cryovac Div. Packaging material for long-term storage of shelf stable food products and method of making same
US4778634A (en) 1986-08-04 1988-10-18 El Paso Products Company Process for the manufacture of porous film
US4735855A (en) * 1986-08-04 1988-04-05 W. R. Grace & Co., Cryovac Div. Thermoformable laminate
US4788105A (en) * 1986-09-09 1988-11-29 W. R. Grace & Co. Oxygen barrier laminates
US5160767A (en) 1987-04-30 1992-11-03 American National Can Company Peelable packaging and sheet materials and compositions for use therein
JP3148821B2 (en) * 1987-05-21 2001-03-26 グンゼ株式会社 Food packaging material and its production method
US4911963A (en) * 1987-08-31 1990-03-27 Viskase Corporation Multilayer film containing amorphous nylon
US4937112A (en) * 1987-12-18 1990-06-26 W. R. Grace & Co.-Conn. High strength coextruded film for chub packaging
US5089308A (en) 1987-12-31 1992-02-18 American National Can Company Coextruded film and methods comprising vinylidene chloride methyl acrylate copolymer
US4851290A (en) * 1988-01-06 1989-07-25 Viskase Corporation Multilayer thermoplastic film
US4977022A (en) * 1988-03-15 1990-12-11 W. R. Grace & Co.-Conn. Barrier stretch film
US4939076A (en) * 1988-03-15 1990-07-03 W. R. Grace & Co.-Conn. Barrier stretch film
US4909726A (en) * 1988-03-24 1990-03-20 Grumman Aerospace Corporation Impact-resistant film for chub packaging
US4855178A (en) * 1988-05-02 1989-08-08 E. I. Du Pont De Nemours And Company Composite chemical barrier fabric
US5053259A (en) * 1988-08-23 1991-10-01 Viskase Corporation Amorphous nylon copolymer and copolyamide films and blends
US5037683A (en) * 1988-09-26 1991-08-06 W. R. Grace & Co.-Conn. High strength laminated film for chub packaging
US4997710A (en) * 1988-09-29 1991-03-05 W. R. Grace & Co.-Conn. Barrier coextruded film for cook-in applications
US5069964A (en) 1989-05-23 1991-12-03 Minnesota Mining And Manufacturing Company Flexible, substrate-insular retroreflective sheeting
US5055328A (en) 1989-06-16 1991-10-08 Viskase Corporation Differentially cross-linked multilayer film
US5112696A (en) * 1989-07-20 1992-05-12 E. I. Du Pont De Nemours And Company Tough monolayer shrink film for products containing moisture
US5079051A (en) * 1989-12-08 1992-01-07 W. R. Grace & Co.-Conn. High shrink energy/high modulus thermoplastic multi-layer packaging film and bags made therefrom
WO1991011317A1 (en) 1990-01-30 1991-08-08 Nippon Petrochemicals Co., Ltd. Monoaxially oriented multilayered packaging material
US20030134966A1 (en) 1990-01-31 2003-07-17 Kim Yong Joo Barrier compositions and articles made therefrom
US5023121A (en) 1990-04-12 1991-06-11 W. R. Grace & Co.-Conn. Coextruded film with peelable sealant
ZA9103312B (en) 1990-05-02 1992-04-29 Zapata Industries Inc Polymer compositions containing oxygen scavenging compounds
NZ237981A (en) * 1990-05-17 1993-12-23 Grace W R & Co Multilayer polymeric film having a polyamide core; high
US5491009A (en) * 1990-08-03 1996-02-13 W. R. Grace & Co.-Conn. Amorphous nylon composition and films
US5256458A (en) 1990-09-18 1993-10-26 Viskase Corporation Shirred thermoplastic casing having external non-oil based lubricating coating
CA2040064C (en) * 1990-11-16 2000-06-13 Cryovac, Inc. Barrier film with improved extensibility for cheese packaging
DE69232102T2 (en) 1991-03-20 2002-01-31 Kuraray Co A process for producing a multi-layer composite film
JP2648404B2 (en) * 1991-04-10 1997-08-27 出光石油化学株式会社 Polyethylene-based multilayer stretched film
US5288531A (en) * 1991-08-09 1994-02-22 The Dow Chemical Company Pouch for packaging flowable materials
DE4130485A1 (en) 1991-08-23 1993-02-25 Wolff Walsrode Ag Coextruded biaxially stretched tubular film
EP0546709B1 (en) * 1991-12-11 1997-06-04 Mobil Oil Corporation High barrier film
CA2106258C (en) * 1992-09-18 2003-11-04 Gautam P. Shah Moisture barrier film
US5482771A (en) * 1992-09-18 1996-01-09 W. R. Grace & Co.-Conn. Moisutre barrier film
US5698279A (en) * 1992-09-23 1997-12-16 Viskase Corporation Heat shrinkable nylon food casing having a functionalized ethylenic polymer core layer
US5549943A (en) * 1992-09-23 1996-08-27 Viskase Corporation Heat shrinkable nylon food casing with a polyolefin core layer
US6221410B1 (en) * 1992-09-25 2001-04-24 Cryovac, Inc. Backseamed casing and packaged product incorporating same
US5482770A (en) * 1992-11-03 1996-01-09 W. R. Grace & Co.-Conn. Highly oriented multilayer film
AT291059T (en) 1992-11-13 2005-04-15 Cryovac Inc Heat shrinkable, by single site catalysis manufactured copolymers containing films.
SE9300558D0 (en) * 1993-02-19 1993-02-19 Kabi Pharmacia Ab Autoclavable multilayer films
DE4306963A1 (en) 1993-03-05 1994-09-08 Wolff Walsrode Ag White opaque barrier film with excellent flatness
US5374459A (en) * 1993-04-06 1994-12-20 W. R. Grace & Co.-Conn. Packaging material for long-term storage of food products
HU221127B1 (en) 1993-04-09 2002-08-28 Viskase Corp Multilayer cheese packaging films process for making such film, and a packaged cheese in such film
US5382470A (en) 1993-04-09 1995-01-17 Viskase Corporation EVOH oxygen barrier stretched multilayer film
CA2104719C (en) 1993-04-21 2005-12-27 Gregory Kenneth Williams Method of making a shrinkable bag with a protective patch
US5402625A (en) * 1993-05-04 1995-04-04 W. R. Grace & Co.-Conn. Bag loader for bone-in products
US5565048A (en) 1993-05-14 1996-10-15 Dow Corning Corporation Barrier film for packaging
US6074715A (en) * 1993-06-24 2000-06-13 Pechiney Plastic Packaging, Inc. Heat shrinkable barrier bags
US5447591A (en) * 1993-08-04 1995-09-05 W. R. Grace & Co.-Conn. Trap printing method for bone-in meat containers
NZ284938A (en) * 1994-04-18 1998-08-26 Grace W R & Co Multilayer films having an anhydride functionality in the outer layer and use thereof in packaging meat products
US5460861A (en) * 1994-05-10 1995-10-24 Viskase Corporation Multilayer stretch/shrink film
US5558930A (en) 1994-06-23 1996-09-24 Tredegar Industries, Inc. Heat sealable, high moisture barrier film and method of making same
DE4431046B4 (en) 1994-09-01 2005-12-29 Empac Verpackungs-Gmbh Plastic packaging container with improved electrostatic conductivity
DE4441848A1 (en) * 1994-11-24 1996-05-30 Wolff Walsrode Ag Sterilizable, thermoformable, adhesive-free and sealable composite film consisting of polyolefins and their copolymers
US6287613B1 (en) * 1994-12-12 2001-09-11 Cryovac Inc Patch bag comprising homogeneous ethylene/alpha-olefin copolymer
US6150011A (en) * 1994-12-16 2000-11-21 Cryovac, Inc. Multi-layer heat-shrinkage film with reduced shrink force, process for the manufacture thereof and packages comprising it
US6623821B1 (en) 1995-03-31 2003-09-23 E. I. Du Pont De Nemours And Company Heat-shrinkable, heat-sealable polyester film for packaging
EP0744285B1 (en) * 1995-05-24 1999-12-15 Cryovac, Inc. Multilayer oxygen barrier packaging film
US5874155A (en) 1995-06-07 1999-02-23 American National Can Company Easy-opening flexible packaging laminates and packaging materials made therefrom
US20020004112A1 (en) 1995-07-24 2002-01-10 Harry Muller Composite films having biaxially oriented polyethylene sealing layers
US5866214A (en) * 1995-07-28 1999-02-02 W. R. Grace & Co.-Conn. Film backseamed casings therefrom, and packaged product using same
DE69606811T3 (en) * 1995-07-31 2012-01-12 Kureha Corp. Multilayer film
TW421626B (en) * 1995-09-12 2001-02-11 Dow Chemical Co Pouches for packaging flowable materials
US5763095A (en) * 1995-11-29 1998-06-09 W. R. Grace & Co.-Conn. Breathable film for cheese packaging
KR100222141B1 (en) * 1996-01-11 1999-10-01 사또 아끼오 Adhesive polyethylene compositions and multi-layer laminated films using the same
DE69729763T2 (en) * 1996-02-28 2004-12-09 Cryovac, Inc. Packaging film for cheese
AU735827B2 (en) * 1996-04-12 2001-07-19 Cryovac, Inc. Heat sealable film
US6071626A (en) 1996-04-29 2000-06-06 Tetra Laval Holdings & Finance, Sa Multilayer, high barrier laminate
US5759648A (en) 1996-07-05 1998-06-02 Viskase Corporation Multilayer plastic film, useful for packaging a cook-in foodstuff
EP0918635B1 (en) * 1996-08-16 2002-12-04 Cryovac, Inc. Article comprising film having polyamide sealant, polyamide core layer, and o 2-barrier layer, and packaged product using same
WO1998008891A1 (en) * 1996-08-26 1998-03-05 Tetra Laval Holdings & Finance, S.A. Cross-linked film for the packaging of flowable materials
WO1998014370A2 (en) 1996-10-03 1998-04-09 Machinery Developments Limited Apparatus and process for meat packing
US6333061B1 (en) * 1996-11-22 2001-12-25 Cryovac, Inc. Packaging article
AU736399B2 (en) 1997-01-17 2001-07-26 Dow Corning Corporation Polyamine/unsaturated organic acid composition for barrier coating
US6667082B2 (en) 1997-01-21 2003-12-23 Cryovac, Inc. Additive transfer film suitable for cook-in end use
US5846620A (en) 1997-02-06 1998-12-08 W. R. Grace & Co.-Conn. High strength flexible film package
BR9807735A (en) 1997-02-25 2000-02-15 Exxon Chemical Patents Inc By heating sealable films
US5928740A (en) 1997-02-28 1999-07-27 Viskase Corporation Thermoplastic C2 -α-olefin copolymer blends and films
US6015235A (en) * 1997-03-07 2000-01-18 Curwood, Inc. Puncture-resistant barrier pouch
US6296886B1 (en) 1997-03-17 2001-10-02 Cryovac, Inc. Method of film crease elimination and patch bag without crease within lay-flat bag side
US6117541A (en) * 1997-07-02 2000-09-12 Tetra Laval Holdings & Finance, Sa Polyolefin material integrated with nanophase particles
US6610392B1 (en) * 1998-03-04 2003-08-26 Cryovac, Inc. Heat-shrinkable multilayer packaging film comprising inner layer comprising a polyester
US6663905B1 (en) * 1998-03-16 2003-12-16 Cryovac, Inc. Patch bag having wrap-around patch
US6010792A (en) * 1998-03-31 2000-01-04 American National Can Company Poultry shrink bags
US6500559B2 (en) * 1998-05-04 2002-12-31 Cryovac, Inc. Multiple layer film with amorphous polyamide layer
US6777046B1 (en) * 1998-07-07 2004-08-17 Curwood, Inc. Puncture resistant, high shrink films, blends, and process
US6004599A (en) 1998-08-10 1999-12-21 Viskase Corporation Bag for packaging bone-in cuts of meat
US6299984B1 (en) * 1998-09-14 2001-10-09 Cryovac, Inc. Heat-shrinkable multilayer thermoplastic film
US6287652B2 (en) 1998-12-09 2001-09-11 Color Prelude, Inc. Fluid product sampler package with clear moisture vapor barrier film
US6579584B1 (en) * 1998-12-10 2003-06-17 Cryovac, Inc. High strength flexible film package utilizing thin film
CA2350764C (en) * 1998-12-18 2004-04-27 Cryovac, Inc. Highly bi-axially oriented, heat-shrinkable, thermoplastic, multi-layer film and process for the manufacture thereof
JP2000188966A (en) * 1998-12-22 2000-07-11 Mitsubishi Chem Mkv Co Multilayered film for agriculture
US6211471B1 (en) 1999-01-27 2001-04-03 Caterpillar Inc. Control system for automatically controlling a work implement of an earthmoving machine to capture, lift and dump material
KR20000076750A (en) 1999-03-01 2000-12-26 존슨 앤드 존슨 비젼 케어, 인코포레이티드 Package for medical device
US6291041B1 (en) * 1999-05-10 2001-09-18 Curwood, Inc. Heat resistant nylon multi-layer film
US20020061982A1 (en) 1999-06-11 2002-05-23 Donald Robert J. Compositions comprising hydrogenated block copolymers and end-use applications thereof
US6458469B1 (en) * 1999-07-08 2002-10-01 Exxonmobil Chemical Company Multilayer oriented films with metallocene catalyzed polyethylene skin layer
US6534137B1 (en) 1999-10-12 2003-03-18 Cryovac, Inc. Two-component, heat-sealable films
US6703141B1 (en) 1999-12-09 2004-03-09 Exxonmobil Oil Corporation Matte surface film
JP4384317B2 (en) * 1999-12-14 2009-12-16 株式会社メイワパックス Packaging bag and package having automatic pressure regulation function
EP1122060A1 (en) 2000-02-07 2001-08-08 Atofina Multilayer structure and tank consisting of this structure, which has a barrier layer in direct contact with the fluid contained
US6436498B1 (en) 2000-03-03 2002-08-20 Dow Corning Corporation Reactive silicone/alkyleneimine barrier laminating adhesives having bis-silane additives
US7267885B1 (en) * 2000-03-16 2007-09-11 Baxter International Inc. Containers and peelable seal containers of new non-PVC material
DK1274571T3 (en) * 2000-04-14 2005-09-12 Du Pont Coextruded multilayer ionomer coating surface coating
US20020022144A1 (en) 2000-05-19 2002-02-21 Hu Yang Enhanced oxygen barrier performance from modification of ethylene vinyl alcohol copolymers (EVOH)
US6447892B1 (en) 2000-05-23 2002-09-10 Honeywell International Inc. Lidding film for modified atmosphere packaging
AU7520301A (en) 2000-06-08 2001-12-17 Pechiney Emballage Flexible Eu Laminated thermoformable film structures useful for packaging food products
US7135526B2 (en) 2001-06-22 2006-11-14 Univation Technologies, Llc Very low density polyethylene and high density polyethylene blends
US7384679B2 (en) 2000-08-29 2008-06-10 Pechiney Emballage Flexible Europe Encapsulated barrier for flexible films and a method of making and using the same
US20020164444A1 (en) 2000-08-29 2002-11-07 Hunt Thomas F. Film structures containing oxygen scavenging compositions and method of application
US6500514B1 (en) 2000-08-29 2002-12-31 Pechiney Emballage Flexible Europe Encapsulated barrier for flexible films and a method of making the same
EP1193052A1 (en) 2000-09-29 2002-04-03 Cryovac, Inc. New heat-shrinkable multi-layer thermoplastic film and container obtained therefrom
US6450011B1 (en) * 2000-11-24 2002-09-17 Mocon, Inc. Pressure measurement method for gas leakage from sealed packages
US20030099851A1 (en) 2000-12-05 2003-05-29 Mount Eldridge M. Multilayer metallized film having enhanced barrier and metal adhesion characteristics
IL140543D0 (en) * 2000-12-25 2002-02-10 Syfan Saad 99 Ltd Multilayer barrier shrink films and process for their manufacture
CA2434587C (en) * 2001-02-01 2008-07-08 Naturin Gmbh & Co. Five-layered, biaxially-oriented, sealable tubular film for the packaging and wrapping of paste-like foodstuffs, meat and meat with bones and use thereof
US20020164441A1 (en) 2001-03-01 2002-11-07 The University Of Chicago Packaging for primary and secondary batteries
US6599639B2 (en) * 2001-03-16 2003-07-29 Cryovac, Inc. Coextruded, retortable multilayer film
US6682792B2 (en) * 2001-03-26 2004-01-27 M & Q Plastic Products, Inc. Thermoplastic elastomer films
US6825276B2 (en) * 2001-04-17 2004-11-30 Pliant Corporation Nonoriented stiff packaging film with superior tear properties
US6602590B2 (en) 2001-05-08 2003-08-05 Honeywell International Inc. Lidding film for modified atmosphere packaging
DE20109885U1 (en) 2001-06-15 2001-10-18 Elsaesser Manfred Gas-filled textured mats for use in construction, civil engineering and foundation engineering
US6831025B2 (en) 2001-06-18 2004-12-14 E. I. Du Pont De Nemours And Company Multiple component spunbond web and laminates thereof
US20050069660A1 (en) 2001-10-19 2005-03-31 Climenhage David C. Composite film structure for manufacturing pouches using rotary thermic sealing
US6824864B2 (en) 2001-10-23 2004-11-30 Exxonmobil Oil Corporation Multi-layer, white cavitated bioriented polyethylene film with a high water vapor transmission rate
US6761965B2 (en) * 2001-11-06 2004-07-13 Cryovac, Inc. Irradiated multilayer film having seal layer containing hyperbranched polymer
US6607795B1 (en) 2001-12-19 2003-08-19 Chevron Phillips Chemical Company Lp Oxygen scavenging compositions comprising polymers derived from aromatic difunctional monomers
US7323669B2 (en) 2002-02-08 2008-01-29 Graphic Packaging International, Inc. Microwave interactive flexible packaging
US6746622B2 (en) 2002-02-08 2004-06-08 Chevron Phillips Chemical Company Lp Oxygen scavenging compositions comprising polymers derived from tetrahydrofurfuryl monomers
US7022258B2 (en) 2002-02-14 2006-04-04 Chevron Phillips Chemical Company, Lp Oxygen scavenging compositions comprising polymers derived from benzenedimethanol monomers
US6726968B2 (en) 2002-02-22 2004-04-27 Honeywell International Inc. Antifog/barrier laminate for use in meat packaging
US6846530B2 (en) 2002-03-05 2005-01-25 Honeywell International Inc. Lamination for specialty meat packaging
DE60333181D1 (en) * 2002-04-15 2010-08-12 Dsm Ip Assets Bv Ür
DE20217987U1 (en) 2002-06-20 2003-03-06 Kuhne Anlagenbau Gmbh Multilayer planar or tubular food casing or film
US20040131805A1 (en) 2002-06-20 2004-07-08 Merical Rick L. Films having a desiccant material incorporated therein and methods of use and manufacture
DK175272B1 (en) 2002-07-08 2004-08-02 Amcor Flexibles Denmark As A sheet material, packaging made therefrom and their use for the packaging
US20060166021A1 (en) 2002-07-09 2006-07-27 Dsm Ip Assets B.V. Process for applying a layer of branched polyamide to a substrate
US7029734B1 (en) 2002-08-20 2006-04-18 Curwood, Inc. Packaging film, package and process for aseptic packaging
US20040043167A1 (en) 2002-09-04 2004-03-04 Gianni Holzem Failure-resistant receptacle and method of manufacture
US6803113B2 (en) 2002-09-13 2004-10-12 Honeywell International Inc. High barrier antifog laminate for case ready meat packaging
US6893730B2 (en) 2002-09-24 2005-05-17 Honeywell International Inc. Barrier film with reduced dynamic coefficient of friction
AU2003304716A1 (en) 2002-10-15 2005-11-25 Exxonmobil Chemical Patents Inc. Polyolefin adhesive compositions and articles made therefrom
US7252878B2 (en) 2002-10-23 2007-08-07 Toray Plastics (America), Inc. High barrier flexible packaging structure
US7166671B2 (en) 2002-12-10 2007-01-23 Cellresin Technologies, Llc Grafted cyclodextrin
US20040175464A1 (en) 2003-03-07 2004-09-09 Blemberg Robert J. Multilayer structures, packages, and methods of making multilayer structures
US20040175466A1 (en) 2003-03-07 2004-09-09 Douglas Michael J. Multilayer barrier structures, methods of making the same and packages made therefrom
AU2004232489B2 (en) 2003-04-24 2010-11-11 Ole-Bendt Rasmussen Method of manufacturing oriented films from alloyed thermoplastic polymers, apparatus for such manufacture and resulting products
US20040234797A1 (en) 2003-05-23 2004-11-25 Cryovac, Inc. Oxygen scavenging film with antifog properties
US7588653B2 (en) 2003-06-23 2009-09-15 Ppg Industries Ohio, Inc. Method of making an integrated window sash
US8178210B2 (en) 2003-07-30 2012-05-15 Cryovac, Inc. Multilayer oriented high-modulus film
US20050186414A1 (en) 2003-10-01 2005-08-25 Toray Plastics (America), Inc. Polypropylene multi-layer barrier films
US7862869B2 (en) 2003-10-20 2011-01-04 Milprint, Inc. Tear initiation and directional tear films and packages made therefrom
US7569276B2 (en) 2003-12-22 2009-08-04 Dupont Teijin Films U.S. Limited Partnership Thermoformable polyester-containing laminates
EP1555292B1 (en) 2004-01-13 2015-12-23 Borealis Technology Oy Extrusion coating polyethylene
US7767773B2 (en) 2004-03-17 2010-08-03 Exxonmobile Chemical Patents Inc. Catalyst compounds are use thereof
US8053047B2 (en) 2004-04-02 2011-11-08 Curwood, Inc. Packaging method that causes and maintains the preferred red color of fresh meat
ES2368487T3 (en) 2004-05-05 2011-11-17 Columbus E. Aps Disposable development device for infusion.
US20070218308A1 (en) 2004-07-13 2007-09-20 Kenneth Lewtas Surface Treatment of Polymeric Articles
US20060014002A1 (en) 2004-07-14 2006-01-19 Moulton Jeffrey D High barrier antifog laminate for case ready meat packaging
SE528263C2 (en) 2004-09-13 2006-10-03 Tetra Laval Holdings & Finance Packing container provided with a strip
US7763095B2 (en) * 2005-06-07 2010-07-27 The Regents Of The University Of California Internal gettering by metal alloy clusters
US20070031546A1 (en) 2005-08-05 2007-02-08 Curwood, Inc. Polyester and polyamide blend containing article for packaging a CO2 respiring foodstuff
US7473439B2 (en) 2005-08-15 2009-01-06 Exxonmobil Oil Corporation Coated polymeric films and coating solutions for use with polymeric films
US7939150B2 (en) 2005-08-16 2011-05-10 Honeywell International Inc. Lid stock using oriented fluoropolymers
US7427430B2 (en) 2005-12-29 2008-09-23 Honeywell International Inc. Polyamide blend composition having excellent gas barrier performance
US20070292567A1 (en) 2005-12-30 2007-12-20 Lithotype Company, Inc. E-beam cured packaging structure, packages, and methods of making
US20070259142A1 (en) 2006-05-03 2007-11-08 Curwood, Inc. Rigid and semirigid packaging articles
US20080063759A1 (en) 2006-09-13 2008-03-13 Raymond Megan N Packaging Method for Storage and Microwave Heating of Food Products
US20080063760A1 (en) 2006-09-13 2008-03-13 Raymond Megan N Packaging System for Storage and Microwave Heating of Food Products
US7713614B2 (en) 2006-09-19 2010-05-11 Kuraray Co., Ltd. Resin composition and multilayer structure
US20080107899A1 (en) 2006-11-07 2008-05-08 Pang-Chia Lu Metallized multi-layer films, methods of manufacture and articles made therefrom
US20080145581A1 (en) 2006-12-14 2008-06-19 Stephen Robert Tanny Peelable multilayer laminate for packaging
US7713636B2 (en) 2006-12-15 2010-05-11 Exxonmobil Chemical Patents Inc. Multi-layer films comprising propylene-based polymers
US8263213B2 (en) 2006-12-19 2012-09-11 E I Du Pont De Nemours And Company Painted composite thermoplastic articles
US7687123B2 (en) 2007-01-29 2010-03-30 Cryovac, Inc. Shrink film containing semi-crystalline polyamide and process for making same
US20100015423A1 (en) 2008-07-18 2010-01-21 Schaefer Suzanne E Polyamide structures for the packaging of moisture containing products

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278738A (en) * 1978-03-10 1981-07-14 W. R. Grace & Co. Ethylene-vinyl acetate copolymer film laminate
US5562996A (en) * 1990-06-27 1996-10-08 Gunze Limited Multi-layer films
US5545419A (en) * 1994-07-21 1996-08-13 W. R. Grace & Co.-Conn. Patch bag having supplemental seal
US6068933A (en) * 1996-02-15 2000-05-30 American National Can Company Thermoformable multilayer polymeric film
US6221470B1 (en) * 1996-02-23 2001-04-24 Cryovac, Inc. Multilayer oxygen barrier packaging film
US6274228B1 (en) * 1998-07-22 2001-08-14 Cryovac, Inc. Heat-shrinkable film with improved inter-ply adhesion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Kondo US 4777095 *

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US20040175466A1 (en) 2004-09-09
US20050118374A1 (en) 2005-06-02

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