US20140370211A1 - Carbon dioxide gas permeable packaging film - Google Patents
Carbon dioxide gas permeable packaging film Download PDFInfo
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- US20140370211A1 US20140370211A1 US13/918,148 US201313918148A US2014370211A1 US 20140370211 A1 US20140370211 A1 US 20140370211A1 US 201313918148 A US201313918148 A US 201313918148A US 2014370211 A1 US2014370211 A1 US 2014370211A1
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- Prior art keywords
- layer
- packaging film
- barrier
- abuse
- sealant
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/185—Articles comprising two or more components, e.g. co-extruded layers the components being layers comprising six or more components, i.e. each component being counted once for each time it is present, e.g. in a layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1324—Flexible food casing [e.g., sausage type, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/24992—Density or compression of components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2813—Heat or solvent activated or sealable
- Y10T428/2817—Heat sealable
- Y10T428/2826—Synthetic resin or polymer
Definitions
- Embodiments of the present inventive concept relate to packaging and, in particular, to a packaging film which is permeable to carbon dioxide gas and which has moderate oxygen gas barrier properties and high moisture characteristics.
- the packaging film of the present invention also has superior sealability and flex-crack resistance characteristics and is ideal for use with carbon dioxide respiring food products, such as Swiss cheese, to increase the shelf life thereof.
- the packaging needs to be workable in such a way that the packaging material may be quickly placed around the item to be packaged using machinery.
- the packaging material must also be of such a quality that it adequately stores the product before the packaging is opened. In the case of food products, this typically means that the packaging materials provide an oxygen and moisture barrier to maintain freshness.
- One commonly used structure in the marketplace for packaging carbon dioxide respiring products such as Swiss cheese is a laminated film having polyethylene terephthalate (PET), adhesive, oriented polypropylene, and ethylene vinyl acetate (EVA) layers.
- PET polyethylene terephthalate
- EVA ethylene vinyl acetate
- Another commonly used structure is a laminated film having Biaxially-Oriented Nylon (BON), adhesive, oriented polypropylene, and EVA layers (see U.S. Pat. No. 7,008,677).
- BON Biaxially-Oriented Nylon
- EVA ethylene vinyl acetate
- One drawback of this structure is its high stiffness and rigidity that causes creation of pin holes in sharp corners.
- Embodiments of the present inventive concept provide a packaging film and method that does not suffer from the problems and limitations of conventional packaging such as those previously discussed.
- a packaging film comprises a barrier layer having a first surface and a second surface opposite the first surface.
- the barrier layer comprises a coextruded multilayer structure having a moisture barrier core layer effective to limit the passage of moisture through the packaging film.
- An abuse layer is disposed on the first surface of the barrier layer and is effective to resist flex cracking of the packaging film and to control oxygen and carbon dioxide permeation.
- a sealant layer is disposed on the second surface of the barrier layer, the sealant layer configured to provide a hermetic seal at high packaging speeds upon being heat sealed with a like sealant layer of an aligned packaging film.
- a method of manufacturing a moisture barrier packaging film comprises coextruding a multilayer barrier structure having a first surface and a second surface opposite the first surface, the multilayer barrier layer comprising a moisture barrier core layer.
- An abuse layer is attached to the first surface of the multilayer barrier structure and a sealant layer is formed on the second surface.
- a food package comprises opposing front and back panels of a polymer packaging film.
- a barrier layer of the polymer packaging film has a first surface and a second surface opposite the first surface.
- the barrier layer comprises a coextruded multilayer structure having a moisture barrier core layer effective to limit the passage of moisture through the packaging film.
- An abuse layer of the packaging film is disposed on the first surface of the barrier layer, the abuse layer being effective to resist flex cracking of the packaging film and to control oxygen and carbon dioxide permeation.
- a sealant layer of the packaging film is disposed on the second surface of the barrier layer, the sealant layer configured to provide a hermetic seal at high packaging speeds upon being heat sealed with a like sealant layer of an aligned packaging film.
- a hermetic seal is provided between at least a portion of the front and back panels of the polymer packaging film.
- FIG. 1 is a schematic illustrating a film with a layer structure, in accordance an exemplary embodiment of the present inventive concept.
- the packaging film 100 is configured to be utilized to package a food product 150 and may advantageously be used in connection with the packaging of Swiss cheese or other carbon dioxide gas respiring food product and is shown and described herein primarily by way of reference thereto. It is to be understood, however, that the packaging film 100 is equally useful for packaging other food products.
- a packaging film with superior sealability i.e., the ability to obtain a hermetic seal at a high packaging speed
- high barrier to moisture and good oxygen barrier properties to increase the shelf life of the product 150
- respiring to carbon dioxide and excellent flex crack resistance to eliminate creating pin holes during the packing process and during transportation
- the multilayer film 100 comprises a first, abuse layer 110 , a second, adhesive layer 120 , a third, barrier layer 130 , and a fourth, sealant layer 140 .
- the structure of an exemplary embodiment of the packaging film 110 is as follows:
- the first layer 110 comprises an abuse layer on the exterior side of the packaging film 100 which does not contact the food product 150 .
- the abuse layer 110 is preferably made of a biaxially oriented nylon film, preferably 36 to 80 gauge biaxially oriented nylon, which has been found to provide excellent flex crack resistance.
- the abuse layer 110 is permeable to carbon dioxide gas and has moderate oxygen barrier properties. In this manner, the thickness of the abuse layer 110 comprises at least a fraction of the thickness of the packaging film 100 in its entirety. It is foreseen that the abuse layer 110 may be made of any like material without deviating from the scope of the present inventive concept.
- the third layer 130 is a coextruded barrier film having a moisture barrier layer 133 in the core, which provides an excellent moisture barrier between the Swiss cheese or other food product 150 and the surrounding environment, thereby enhancing product shelf life.
- the third layer 130 has a thickness which is a fraction of the thickness of the packaging film 100 and provides a variety of advantages to the packaging film 100 , as discussed herein.
- the third layer 130 has a thickness in the range of about 0.8 mil to about 2.0 mil.
- the core 133 is preferably made of high density polyethylene (HDPE) with a density between 0 .93 to 0.97 g/cm 3 and has a thickness of a fraction of the thickness of the packaging film 100 in its entirety. It is foreseen, however, that the middle layer 133 may be made of any HDPE or like material without deviating from the scope of the present inventive concept.
- HDPE high density polyethylene
- the coextruded barrier layer 130 further includes outer layers 131 and 132 on the opposite sides of the core 133 .
- the outer layers 131 and 132 adhere to the core layer 133 without the need to use tie layers between the coextruded layers.
- the outermost layers 131 and 132 are disposed on the opposite side of the central core 133 and have a thickness which is a fraction of the thickness of the packaging film 100 in its entirety.
- the outer core layers 131 , 132 comprise polyolefin or polyolefin copolymer, preferably polyethylene or polyethylene copolymer. It is foreseen, however, that the outer core layers 131 , 132 may be made of other like materials without deviating from the scope of the present inventive concept.
- the core layer 133 may be extruded from a first extruder.
- the outer layers 131 , 132 may be extruded from a second and third extruders.
- the outer layers ( 131 , 132 ) of the barrier layer 130 may each be split into two layers and directed to either side of the HDPE core layer 133 layer by a feedblock device.
- the coextruded barrier film layer 130 is laminated to the abuse layer 110 using an adhesive layer 120 disposed between the abuse layer 110 and the coextruded barrier layer 130 . In this manner, the barrier film layer 130 and the abuse layer 110 are adhered together.
- the adhesive layer 120 is polyethylene or polyurethane. It is foreseen, however, that the adhesion layer 120 may be made of any other suitable adhesive layer without deviating from the scope of the present inventive concept.
- the sealant layer (inner layer) 140 comprises a low seal initiation temperature ethylene copolymer such as ethylene vinyl acetate (EVA) and has a thickness of a fraction of the thickness of the packaging film 100 in its entirety.
- the thickness of the sealant layer 140 is preferably in the range of about 0.8 mil to 2.0 mil.
- the sealant layer is preferably a low seal initiation temperature ethylene copolymer, most preferably an ethylene copolymer having a comonomer content of 12% or higher and a melt flow index of about 20 g/in or higher.
- the sealant layer 140 directly abuts the coextruded barrier layer 130 and is adhered to the coextruded barrier layer 130 using an extrusion coating process.
- the multilayer structure 100 described herein has superior seal characteristics, permeable to carbon dioxide, moderate oxygen barrier properties, high barrier to moisture, and flex crack resistance.
- the packaging film 100 provides an improved multilayer packaging over the prior art film structures for packing carbon dioxide respiring products such as Swiss having an oriented polypropylene barrier layer, such as the films described in U.S. Pat. No. 7,008,677.
- the layers 110 , 130 , and 140 complement each other by supplementing weaker characteristics of the other.
- a BON abuse layer 110 in the presently disclosed structure, it has improved flex crack resistance and good oxygen barrier properties and also it is permeable to carbon dioxide.
- Replacing the prior art oriented polypropylene barrier layer a coextruded moisture barrier with HDPE in the core provides a softer structure without sacrificing moisture barrier properties.
- the sealant layer 140 has enhanced seal properties that are higher than that of the barrier layer 130 .
- the packaging film 100 of the present disclosure has carbon dioxide breathability, enhanced seal characteristics, moderate oxygen barrier properties, and excellent moisture barrier and flex-crack resistance characteristics. It has been discovered via testing of the packaging film 100 of the present inventive concept that such yields almost zero pin holes in flex crack testing.
- the packaging film 100 is particularly ideal for use with and to store the food product 150 , which may advantageously be Swiss cheese or other carbon dioxide respiring food products.
Abstract
Description
- Embodiments of the present inventive concept relate to packaging and, in particular, to a packaging film which is permeable to carbon dioxide gas and which has moderate oxygen gas barrier properties and high moisture characteristics. The packaging film of the present invention also has superior sealability and flex-crack resistance characteristics and is ideal for use with carbon dioxide respiring food products, such as Swiss cheese, to increase the shelf life thereof.
- Flexible packaging, particularly for food, is subject to many demands. The packaging needs to be workable in such a way that the packaging material may be quickly placed around the item to be packaged using machinery. The packaging material must also be of such a quality that it adequately stores the product before the packaging is opened. In the case of food products, this typically means that the packaging materials provide an oxygen and moisture barrier to maintain freshness.
- One commonly used structure in the marketplace for packaging carbon dioxide respiring products such as Swiss cheese is a laminated film having polyethylene terephthalate (PET), adhesive, oriented polypropylene, and ethylene vinyl acetate (EVA) layers. This structure, however, has poor flex crack resistance and oxygen gas barrier properties. Another commonly used structure is a laminated film having Biaxially-Oriented Nylon (BON), adhesive, oriented polypropylene, and EVA layers (see U.S. Pat. No. 7,008,677). One drawback of this structure is its high stiffness and rigidity that causes creation of pin holes in sharp corners.
- Accordingly, there is a continuing need for improved flexible packaging and a method of making the same that provides carbon dioxide breathability while also providing superior sealing and moisture barrier properties as well as excellent flex crack and puncture resistance.
- The following brief summary is provided to indicate the nature of the subject matter disclosed herein. While certain aspects of the present inventive concept are described below, the summary is not intended to limit the scope of the present inventive concept. Embodiments of the present inventive concept provide a packaging film and method that does not suffer from the problems and limitations of conventional packaging such as those previously discussed.
- In one aspect, a packaging film comprises a barrier layer having a first surface and a second surface opposite the first surface. The barrier layer comprises a coextruded multilayer structure having a moisture barrier core layer effective to limit the passage of moisture through the packaging film. An abuse layer is disposed on the first surface of the barrier layer and is effective to resist flex cracking of the packaging film and to control oxygen and carbon dioxide permeation. A sealant layer is disposed on the second surface of the barrier layer, the sealant layer configured to provide a hermetic seal at high packaging speeds upon being heat sealed with a like sealant layer of an aligned packaging film.
- In another aspect, a method of manufacturing a moisture barrier packaging film comprises coextruding a multilayer barrier structure having a first surface and a second surface opposite the first surface, the multilayer barrier layer comprising a moisture barrier core layer. An abuse layer is attached to the first surface of the multilayer barrier structure and a sealant layer is formed on the second surface.
- In yet a further aspect, a food package comprises opposing front and back panels of a polymer packaging film. A barrier layer of the polymer packaging film has a first surface and a second surface opposite the first surface. The barrier layer comprises a coextruded multilayer structure having a moisture barrier core layer effective to limit the passage of moisture through the packaging film. An abuse layer of the packaging film is disposed on the first surface of the barrier layer, the abuse layer being effective to resist flex cracking of the packaging film and to control oxygen and carbon dioxide permeation. A sealant layer of the packaging film is disposed on the second surface of the barrier layer, the sealant layer configured to provide a hermetic seal at high packaging speeds upon being heat sealed with a like sealant layer of an aligned packaging film. A hermetic seal is provided between at least a portion of the front and back panels of the polymer packaging film.
- Additional aspects, advantages, and utilities of the present inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present inventive concept.
- Embodiments of the present inventive concept are described in detail below with reference to the attached drawing figures, wherein:
-
FIG. 1 is a schematic illustrating a film with a layer structure, in accordance an exemplary embodiment of the present inventive concept. - The drawing figure does not limit the present inventive concept to the specific embodiments disclosed and described herein. The drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present inventive concept.
- Detailed embodiments of the present inventive concept are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present inventive concept in virtually any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting but rather to provide an understandable description of the present inventive concept.
- The terms “a” or “an,” as used herein, are defined as one or more than one. The term “another,” as used herein, is defined as at least a second or more. The terms “including” and/or “having” as used herein, are defined as comprising (i.e., open transition). The term “coupled” or “operatively coupled,” as used herein, is defined as indirectly or directly connected.
- Referring to
FIG. 1 , apackaging film 100 manufactured in accordance with embodiments of the preset inventive concept is illustrated. Thepackaging film 100 is configured to be utilized to package afood product 150 and may advantageously be used in connection with the packaging of Swiss cheese or other carbon dioxide gas respiring food product and is shown and described herein primarily by way of reference thereto. It is to be understood, however, that thepackaging film 100 is equally useful for packaging other food products. - For some applications, such as for packaging Swiss cheese and others, a packaging film with superior sealability (i.e., the ability to obtain a hermetic seal at a high packaging speed), high barrier to moisture and good oxygen barrier properties (to increase the shelf life of the product 150), respiring to carbon dioxide and excellent flex crack resistance (to eliminate creating pin holes during the packing process and during transportation) is required. In order to achieve all these requirements, the multilayer laminated
film 100 in accordance with this disclosure was developed. - The
multilayer film 100 comprises a first,abuse layer 110, a second,adhesive layer 120, a third,barrier layer 130, and a fourth,sealant layer 140. The structure of an exemplary embodiment of thepackaging film 110 is as follows: - wherein a “—” is used to indicate layers that are separately formed and attached and “/” is used to indicate layers that are coextruded with one another.
- The
first layer 110 comprises an abuse layer on the exterior side of thepackaging film 100 which does not contact thefood product 150. Theabuse layer 110 is preferably made of a biaxially oriented nylon film, preferably 36 to 80 gauge biaxially oriented nylon, which has been found to provide excellent flex crack resistance. Theabuse layer 110 is permeable to carbon dioxide gas and has moderate oxygen barrier properties. In this manner, the thickness of theabuse layer 110 comprises at least a fraction of the thickness of thepackaging film 100 in its entirety. It is foreseen that theabuse layer 110 may be made of any like material without deviating from the scope of the present inventive concept. - The
third layer 130 is a coextruded barrier film having amoisture barrier layer 133 in the core, which provides an excellent moisture barrier between the Swiss cheese orother food product 150 and the surrounding environment, thereby enhancing product shelf life. Thethird layer 130 has a thickness which is a fraction of the thickness of thepackaging film 100 and provides a variety of advantages to thepackaging film 100, as discussed herein. Preferably, thethird layer 130 has a thickness in the range of about 0.8 mil to about 2.0 mil. - The
core 133 is preferably made of high density polyethylene (HDPE) with a density between 0.93 to 0.97 g/cm3 and has a thickness of a fraction of the thickness of thepackaging film 100 in its entirety. It is foreseen, however, that themiddle layer 133 may be made of any HDPE or like material without deviating from the scope of the present inventive concept. - The
coextruded barrier layer 130 further includesouter layers core 133. Theouter layers core layer 133 without the need to use tie layers between the coextruded layers. - The
outermost layers central core 133 and have a thickness which is a fraction of the thickness of thepackaging film 100 in its entirety. In preferred embodiments, the outer core layers 131, 132 comprise polyolefin or polyolefin copolymer, preferably polyethylene or polyethylene copolymer. It is foreseen, however, that the outer core layers 131, 132 may be made of other like materials without deviating from the scope of the present inventive concept. - The
core layer 133 may be extruded from a first extruder. Theouter layers barrier layer 130 may each be split into two layers and directed to either side of theHDPE core layer 133 layer by a feedblock device. - The coextruded
barrier film layer 130 is laminated to theabuse layer 110 using anadhesive layer 120 disposed between theabuse layer 110 and thecoextruded barrier layer 130. In this manner, thebarrier film layer 130 and theabuse layer 110 are adhered together. In the preferred embodiment, theadhesive layer 120 is polyethylene or polyurethane. It is foreseen, however, that theadhesion layer 120 may be made of any other suitable adhesive layer without deviating from the scope of the present inventive concept. - The sealant layer (inner layer) 140 comprises a low seal initiation temperature ethylene copolymer such as ethylene vinyl acetate (EVA) and has a thickness of a fraction of the thickness of the
packaging film 100 in its entirety. The thickness of thesealant layer 140 is preferably in the range of about 0.8 mil to 2.0 mil. The sealant layer is preferably a low seal initiation temperature ethylene copolymer, most preferably an ethylene copolymer having a comonomer content of 12% or higher and a melt flow index of about 20 g/in or higher. Thesealant layer 140 directly abuts thecoextruded barrier layer 130 and is adhered to thecoextruded barrier layer 130 using an extrusion coating process. Themultilayer structure 100 described herein has superior seal characteristics, permeable to carbon dioxide, moderate oxygen barrier properties, high barrier to moisture, and flex crack resistance. - The
packaging film 100 according to the present disclosure provides an improved multilayer packaging over the prior art film structures for packing carbon dioxide respiring products such as Swiss having an oriented polypropylene barrier layer, such as the films described in U.S. Pat. No. 7,008,677. Thelayers BON abuse layer 110 in the presently disclosed structure, it has improved flex crack resistance and good oxygen barrier properties and also it is permeable to carbon dioxide. Replacing the prior art oriented polypropylene barrier layer a coextruded moisture barrier with HDPE in the core provides a softer structure without sacrificing moisture barrier properties. Thesealant layer 140 has enhanced seal properties that are higher than that of thebarrier layer 130. - In this manner, the
packaging film 100 of the present disclosure has carbon dioxide breathability, enhanced seal characteristics, moderate oxygen barrier properties, and excellent moisture barrier and flex-crack resistance characteristics. It has been discovered via testing of thepackaging film 100 of the present inventive concept that such yields almost zero pin holes in flex crack testing. Thus, thepackaging film 100 is particularly ideal for use with and to store thefood product 150, which may advantageously be Swiss cheese or other carbon dioxide respiring food products. - Although the present inventive concept has been described with reference to the preferred embodiments illustrated in the attached drawing figures, it is noted that equivalents may be employed and substitutions made herein without departing from the scope of the present inventive concept as recited in the claims.
Claims (21)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/918,148 US20140370211A1 (en) | 2013-06-14 | 2013-06-14 | Carbon dioxide gas permeable packaging film |
CA2849603A CA2849603A1 (en) | 2013-06-14 | 2014-04-23 | Carbon dioxide gas permeable packaging film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/918,148 US20140370211A1 (en) | 2013-06-14 | 2013-06-14 | Carbon dioxide gas permeable packaging film |
Publications (1)
Publication Number | Publication Date |
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US20140370211A1 true US20140370211A1 (en) | 2014-12-18 |
Family
ID=52019455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/918,148 Abandoned US20140370211A1 (en) | 2013-06-14 | 2013-06-14 | Carbon dioxide gas permeable packaging film |
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US (1) | US20140370211A1 (en) |
CA (1) | CA2849603A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130323488A1 (en) * | 2012-05-31 | 2013-12-05 | Prolamina Midwest Corporation | Packaging Film and Method of Manufacture |
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2013
- 2013-06-14 US US13/918,148 patent/US20140370211A1/en not_active Abandoned
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