EP1699633A1 - Emballage plastique pour produits primaires et transformes - Google Patents

Emballage plastique pour produits primaires et transformes

Info

Publication number
EP1699633A1
EP1699633A1 EP04800625A EP04800625A EP1699633A1 EP 1699633 A1 EP1699633 A1 EP 1699633A1 EP 04800625 A EP04800625 A EP 04800625A EP 04800625 A EP04800625 A EP 04800625A EP 1699633 A1 EP1699633 A1 EP 1699633A1
Authority
EP
European Patent Office
Prior art keywords
nylon
layer
product
package
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04800625A
Other languages
German (de)
English (en)
Inventor
Earl L. Hatley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell International Inc
Original Assignee
Honeywell International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell International Inc filed Critical Honeywell International Inc
Publication of EP1699633A1 publication Critical patent/EP1699633A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/04—Punching, slitting or perforating
    • 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • 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
    • 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
    • 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.]
    • Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, 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
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]

Definitions

  • This invention relates to packaged produce products which are packaged in polyamide films, especially for fruits and vegetables.
  • Fresh vegetable and fruit produce are often packaged at the grower level for shipment to end users.
  • Such produce needs a moisture permeable packaging material to permit moisture condensation to escape the sealed package for extended shelf life, enhanced product maturity, enhanced appearance, reduced spoilage, as well as increased harvest yield and to permit better in-transit shipment packaging in cubes.
  • the produce is sold for food service or institutional uses, as well as for retail sale and consumer use.
  • U.S. Patent 6,190,710 to Nir et al. discloses a method of preserving produce by using a polyamide packaging film that has a certain level of permeability to water vapor, which allows the packaged produce product to be contained in a specified gaseous atmosphere.
  • the polyamide film is perforated to a desired extent such that no or minimal condensation appears on the surface of the packaging material.
  • Nir et al. patent discloses the use of monolayer polyamide films for this application, in particular nylon 6, nylon 66, nylon 6,66, nylon 6/12 and blends of the foregoing as well as blends with other polyamides (e.g., nylon 11, 12 or 6I/6T) or with other polymers and copolymers.
  • the films utilized by Nir et al. do not have robust strength when they are heat sealed. Accordingly, it would be desirable to provide a produce package which is formed from a polyamide film but which has stronger heat seals such that the package does not split open either in handling or transit.
  • a packaged produce product which comprises a package formed from at least one coextruded polyamide film comprising at least one first layer formed from a polyamide selected from the group consisting of nylon 6, nylon 66 and blends thereof, and at least one second layer of nylon 6,66 in contact with the first layer, and produce contained within the package, the film being heat sealed via the nylon 6,66 layer.
  • a packaged produce product comprising a package formed from at least one coextruded polyamide film comprising at least one layer of nylon 6, and at least one layer of nylon 6,66 in contact with the nylon 6 layer, and produce contained within the package, the package being formed from at least one polyamide film being heat sealed via the nylon 6,66 layer.
  • the package of this invention exhibits increased heat seal strength and improved transmission of gases to provide a desirable modified atmosphere in the package. It has been unexpectedly found that packages formed from the foregoing coextruded layers exhibit enhanced moisture permeation. This enables shipment to the consumer in significantly enhanced product wholesomeness. In addition, using the coextruded film of this invention results in a package that has desirable packaging properties and higher heat seal strength than packages of similar thickness wliich are formed from a single layer of nylon 6, for example.
  • plastic packages for fruits and vegetables are U.S. Patents ,.4,886,372; 5,492,705; 5,832,699; 6,296,923 and 6,441,340.
  • polyamides useful in the coextruded product of this invention are film- forming polyamides.
  • Monolayer structures of nylon 6 film are available from Honeywell International Inc., for example, under the trademark Capran.
  • Nylon 6 polymers are available from a number of suppliers, including Honeywell and BASF.
  • Nylon 66 polymers are also available from a number of suppliers, such as Du Pont.
  • Nylon 6,66 is a copolymer containing caprolactam (nylon 6 monomer) moieties and hexamethylene diamine (nylon 66 precursor) moieties. The weight ratio of the nylon
  • nylon 6,6 moiety to the nylon 6,6 moiety in the copolymer may be any desired amount.
  • the weight percent of nylon 6 moiety in the nylon 6,66 copolymer ranges from about 10 to about 95%, more preferably from about 55 to about 95% and most preferably from about 70 to about 90%.
  • Nylon 6,66 copolymer is available from a number of suppliers, including Honeywell, BASF and Du Pont.
  • the polyamides useful in this invention typically have molecular weights in the range of from about 10,000 to about 100,000.
  • the coextruded film useful in this invention can be provided by any typical coextrusion process. In a typical coextrusion process, the polymeric materials for the individual layers are fed into infeed hoppers of a like number of extruders, each extruder handling the material for one or more of the layers. The melted and plasticated streams from the individual extruders are fed into a single manifold co-extrusion die. While in the die, the layers are juxtaposed and combined, then emerge from the die as a single multiple layer film of polymeric material.
  • the film-forming apparatus may be one which is referred to in the art as a blown film apparatus and includes a multi- manifold circular die head for bubble blown film through which the plasticized film composition is forced and formed into a film bubble which may ultimately be " collapsed and formed into a film. Processes of coextrusion to form film and sheet laminates are generally known in the art. Typical coextrusion teclmiques are described, for example, in U.S. patents 5,139,878 and 4,677,017.
  • the coextruded film used in this invention may or may not be oriented. Such orientation includes monoaxial orientation and biaxial orientation.
  • orientation includes monoaxial orientation and biaxial orientation.
  • the terms "orienting” and “stretching” shall be used interchangeably.
  • the coextruded may be stretched or oriented in any desired direction using methods known to those skilled in the art. In such a stretching operation, the film may be stretched uniaxially in either the direction coincident with the direction of movement of the film being withdrawn from the casting roll, also referred to in the art as the "machine direction”, or in as direction which is perpendicular to the machine direction, and referred to in the art as the "transverse direction”, or biaxially in both the machine direction and the transverse direction.
  • the coextruded film may be oriented by the so-called double bubble process.
  • draw ratio is an indication of the increase in the dimension in the direction of draw. Preferred draw ratios are from about 1.5 : 1 to 5 : 1 in at least one direction and more preferably from about 2:1 to about 3:1 in at least one direction.
  • the first layer of the film of this invention is formed from nylon 6, nylon 66 or blends thereof.
  • Nylon 6 is the preferred polymer of the first polyamide layer.
  • the coextruded films used in this invention may have any desirable thickness.
  • the combined thickness of the coextruded films ranges from about 1 to about 50 ⁇ m, more preferably from about 5. to about 40 ⁇ m and most preferably from about 10 to about 30 ⁇ m.
  • the thicknesses of each individual layer of the coextruded film may or may not be the same. While the foregoing thicknesses are referenced, it is to be understood that other layer thicknesses may be produced to satisfy a particular need and yet fall within the scope of the present invention. If the coextruded film is oriented, the thickness of the film before stretching is selected such that the desired thickness after stretching is achieved, based on the stretch ratio employed, as is known in the art.
  • the films useful in this invention may include more than one additional layers.
  • a three layer coextruded film formed from nylon 6/ nylon 61 nylon 6,66 may be employed.
  • the film be formed from a single nylon 6 layer and a single nylon 6,66 layer.
  • Any of the layers of the coextruded film may incorporate conventional additives.
  • additives include, without limitation, oxidative stabilizers, heat stabilizers, antiblock additives, lubricants, release agents, oxidation inhibitors, oxygen scavengers, dyes, pigments other coloring agents, ultraviolet light absorbers and stabilizers, fillers (organic or inorganic), nucleating agents, plasticizers, flame retardant agents and other conventional additives known in the art.
  • Such additives may be utilized in conventional amounts, typically no more than about 10% by weight of the individual film layer.
  • the film is preferably provided with perforations, such as microp ⁇ rforations. These perforations may be made by mechanical means or by a laser. The perforations permit the tailoring of the modified atmosphere in the package to the particular fruit or vegetable in the package, as well as its ripeness, etc.
  • the coextruded films may be formed into any suitable package which contains the produce.
  • a bag may be made from a single coextruded film which is folded on itself with the nylon 6,66 layer facing inwardly and in which has the sides are heat sealed together along their perimeter.
  • the top of the bag may be heat sealed to itself or merely folded over, depending on the modified atmosphere desired in the package.
  • the top of the bag may be twisted together instead.
  • two coextruded films may be overlapped, with the nylon 6,66 layers facing inwardly, and the side and bottom edges heat sealed together along their perimeter to form a bag.
  • the produce is then placed into the bag and the top heat sealed or not as explained above.
  • the packages of this invention may be in the form of pouches, overwraps, etc.
  • any conventional device may be utilized, such as a hot bar, hot wire or thermal impulse.
  • the coextruded film package of this invention can contain any desired fruit or vegetable.
  • Non-limiting examples include melons, peppers, mangoes, bananas, grapes, strawberries, lettuce, eggplant, bean sprouts, mushrooms, green beans, cucumbers, carrots, tomatoes, broccoli, corn, flowers, etc.
  • a coextruded film of nylon 6 and nylon 6,66 when employed with a combined thickness of about 15 to about 25 microns (3.8 to about 6.3 mils) provides a film structure that permeates from about 8 to about 20 percent more moisture than polyamide films of similar thickness formed from monolayer of nylon 6 only, nylon 6,12 only and blends of polyamides and polyolefins.
  • the heat seal strength between the nylon 6,66 layers of the structure is preferably between at least about 700 grams, more preferably about 1000 to about 1700 grams, for example, which is stronger than the seal between two nylon 6 layers of similar thickness.
  • a two layer unoriented film is formed by coextruding a nylon 6 layer and nylon
  • the melt temperature during extrusion is between 465 to 544 °F (241 to
  • the polymers are extruded as a cast film by a typical cast film extrusion process, with a combined thickness of 75 mils (19 ⁇ m).
  • the film is tested for its water vapor transmission rate (WNTR) and its oxygen and carbon dioxide transmission rates, and such rates are compared with those of a single layer of cast nylon 6 film and a single layer of monoaxially oriented cast nylon 6 film. The results are shown in Table 1. TABLE 1
  • Example 2 The film of Example 1 is sealed to itself with a pressure of 40 psi (0.28 Mpa) and a 1 second dwell time, at three different temperatures, with the nylon 6,66 layers being heat sealed together. As a comparison, a monolayer of nylon 6 is similarly tested. The results are shown in Table 2.
  • the coextruded film is formed into a bag by folding over the film with, the nylon 6,66 layer facing inward and heat sealing the two side edges together. Melons are packaged in the bag.
  • coextruded nylon 6/nylon 6,66 films have higher oxygen, carbon dioxide and water vapor transmission rates than films of nylon 6 monolayer and monoaxially oriented nylon 6 monolayer.
  • the heat seal strength of the nylon 6/nylon 6,66 coextruded film is significantly greater than that of monolayer nylon 6 films.
  • packages formed from the film have enhanced moisture permeation which enables shipment to the consumer of produce with enhanced product wholesomeness.

Landscapes

  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne un produit primaire et transformé emballé constitué à partir d'au moins un film de polyamide. Ce film de polyamide est un film coextrudé d'au moins une couche de nylon 6 et d'au moins une couche de nylon 6,66. Ledit film est thermosoudé afin de former un emballage au moyen de la couche de nylon 6,66 et le produit est contenu au sein de l'emballage. Un seul film de polyamide peut être utilisé et ledit film est thermosoudé à lui-même. En outre, deux films de polyamide se chevauchant sont utilisés et les couches de nylon 6,66 des deux films sont thermosoudées. L'emballage présente une résistance au thermosoudage accrue et une transmission améliorée de gaz, de manière à engendrer une atmosphère modifiée souhaitable dans l'emballage.
EP04800625A 2003-12-30 2004-11-02 Emballage plastique pour produits primaires et transformes Withdrawn EP1699633A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/748,403 US20050142310A1 (en) 2003-12-30 2003-12-30 Plastic packaging for produce products
PCT/US2004/036506 WO2005068194A1 (fr) 2003-12-30 2004-11-02 Emballage plastique pour produits primaires et transformes

Publications (1)

Publication Number Publication Date
EP1699633A1 true EP1699633A1 (fr) 2006-09-13

Family

ID=34700889

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04800625A Withdrawn EP1699633A1 (fr) 2003-12-30 2004-11-02 Emballage plastique pour produits primaires et transformes

Country Status (6)

Country Link
US (1) US20050142310A1 (fr)
EP (1) EP1699633A1 (fr)
BR (1) BRPI0418345A (fr)
CR (1) CR8496A (fr)
IL (1) IL176640A0 (fr)
WO (1) WO2005068194A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11873149B2 (en) 2018-11-09 2024-01-16 Sofresh, Inc. Blown film materials and processes for manufacturing thereof and uses thereof

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060263492A1 (en) * 2005-05-04 2006-11-23 Daniel Whittles Produce packaging system and method of use
US20080093241A1 (en) * 2005-10-07 2008-04-24 Kidder John W Apparatus, system, and method for storage of mushrooms
MA34320B1 (fr) * 2010-06-01 2013-06-01 Perfo Knowledgy Bv Emballage destiné à préserver des produits respirants et appareil permettant de fabriquer ledit emballage
US20120213896A1 (en) * 2011-02-23 2012-08-23 Cryovac, Inc. Ovenable Cook-In Film Providing Decreased Protein Adhesion
CA2945089A1 (fr) 2014-04-09 2015-10-15 Ifood Packaging Systems Limited Etiquette pour conditionnement sous atmosphere modifiee
GB201516575D0 (en) * 2015-09-18 2015-11-04 Johnson Matthey Plc Food Packaging

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GB2221692B (en) * 1988-07-15 1992-04-15 Courtaulds Films & Packaging Storage and packaging of plant material
GB2221691B (en) * 1988-07-15 1992-04-15 Courtaulds Films & Packaging Polymeric films for the storage or packing of plant material
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JP4154069B2 (ja) * 1998-04-15 2008-09-24 株式会社クレハ ガスバリヤ性フィルム
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See also references of WO2005068194A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11873149B2 (en) 2018-11-09 2024-01-16 Sofresh, Inc. Blown film materials and processes for manufacturing thereof and uses thereof

Also Published As

Publication number Publication date
US20050142310A1 (en) 2005-06-30
CR8496A (es) 2007-02-05
BRPI0418345A (pt) 2007-05-02
IL176640A0 (en) 2006-10-31
WO2005068194A1 (fr) 2005-07-28

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