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WO1998017546A1 - Emballage a mecanisme d'amorce de pelage - Google Patents

Emballage a mecanisme d'amorce de pelage Download PDF

Info

Publication number
WO1998017546A1
WO1998017546A1 PCT/US1997/016973 US9716973W WO9817546A1 WO 1998017546 A1 WO1998017546 A1 WO 1998017546A1 US 9716973 W US9716973 W US 9716973W WO 9817546 A1 WO9817546 A1 WO 9817546A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
sealing surface
support member
flange
package
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.)
Ceased
Application number
PCT/US1997/016973
Other languages
English (en)
Inventor
James R. Mabry
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.)
WR Grace and Co Conn
Cryovac LLC
WR Grace and Co
Original Assignee
WR Grace and Co Conn
Cryovac LLC
WR Grace and Co
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 WR Grace and Co Conn, Cryovac LLC, WR Grace and Co filed Critical WR Grace and Co Conn
Priority to AU48017/97A priority Critical patent/AU4801797A/en
Publication of WO1998017546A1 publication Critical patent/WO1998017546A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/22—Details
    • B65D77/30—Opening or contents-removing devices added or incorporated during filling or closing of containers
    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure
    • B65D77/2048—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure whereby part of the container or cover has been weakened, e.g. perforated or precut
    • B65D77/2056—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure whereby part of the container or cover has been weakened, e.g. perforated or precut the cover being weakened
    • 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
    • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10—Container closures formed after filling
    • B65D2577/20—Container closures formed after filling by applying separate lids or covers
    • B65D2577/2041—Pull tabs
    • B65D2577/205—Pull tabs integral with the closure

Definitions

  • the present invention relates generally to packages for fresh red meat.
  • this invention is directed to the packaging of food products such that the packaged product may be maintained in one condition under certain circumstances and then converted to another condition.
  • packages in accordance with the present invention provide for distribution of a packaged product in a low oxygen environment and for introduction of oxygen to the product surface at a supermarket or other retail outlet. While a wide variety of food products can be packaged in accordance with the teachings of this invention, it is particularly advantageous in connection with the packaging of fresh red meat such that the meat may be transported in a low oxygen atmosphere, that is, preferably 0.5% O 2 or less, and then caused to bloom when it reaches a supermarket by exposure to oxygen.
  • Examples of these types of packages include dual overwrap packages wherein a permeable film is wrapped around the meat and its support member and an impermeable film is wrapped about the permeable film, dual lid packages which include a permeable lid and an impermeable lid sealed to the periphery of the support member, and packages with a head space which allows for the introduction of a treating gas, typically nitrogen, carbon dioxide or some mixture of the two, between a permeable film adjacent to the meat product and an impermeable upper web.
  • a treating gas typically nitrogen, carbon dioxide or some mixture of the two
  • Such impermeable support members may generally be chosen from a variety of commercially available designs and compositions, and generally include a tray with a sealant material bonded to the innermost and uppermost surfaces thereof.
  • the sealant material generally serves both as a material to which a lidding film can be sealed and also as a material which provides a barrier to the passage of oxygen into the tray.
  • Examples of commercially available trays include those which are formed of a rigid solid polymer, a barrier/sealant coated polymer, a barrier/sealant coated foamed polymer, or barrier/sealant coated pulp or paperboard.
  • an oxygen impermeable/sealant film must be included, at least, on the innermost and uppermost surfaces of the tray in order to prevent the ingress of oxygen into the package and to allow a lidding film to be sealed to the tray.
  • One readily available support member is a foamed substrate of a resin such as polystyrene or polypropylene with a sealant film laminated thereto.
  • the oxygen impermeable/sealant film must be capable of forming a seal, preferably a heat seal, with the permeable film and, in a dual lid package, the impermeable film.
  • the sealant film In order to prevent outgassing of residual gases from the foamed structure into the package and in order to maintain a low oxygen atmosphere within the package prior to removal of the upper impermeable film, the sealant film must also be an oxygen impermeable film.
  • a tray formed from such a film/foam laminate is generally referred to as a "barrier foam tray.”
  • the film/foam laminate from which the support member is produced is formed by extruding a foamed sheet, extruding a sealant film, and laminating the two together.
  • the laminate is then thermoformed and cut into a plurality of support members, commonly referred to as barrier foam trays. At the cut edge of each tray it is possible to view the film/foam laminate in cross-section.
  • another film laminated to the opposite side of the foamed sheet is employed to form a film/foam/film laminate.
  • such three-layer laminate is discernible at the cut edge of each tray made therefrom.
  • the present invention provides a package comprising a support member or tray comprising a base, sidewalls extending upwardly therefrom, and a flange.
  • the flange comprises at least one sealing surface extending about a perimeter thereof and a lip adjacent and exterior to the at least one sealing surface and positioned below the sealing surface.
  • the sidewalls have an innermost surface and the base, sealing surface and lip have an uppermost surface.
  • a sealant material is bonded to the innermost surface of the sidewalls and on the uppermost surfaces of the base, sealing surface, and lip.
  • a product is positioned within the support member and a film is sealed to the support member at the at least one sealing surface of the flange thereby enclosing the product. The film extends outwardly from the at least one sealing surface and is not sealed to the lip.
  • a package in accordance with another aspect of the invention, includes a support member comprising a base, sidewalls extending upwardly therefrom, and a flange.
  • the flange comprises a first, interior sealing surface and a second, exterior sealing surface, each of the sealing surfaces extending about separate perimeters of the flange.
  • the flange further comprises a lip adjacent and exterior to the second sealing surface and is positioned below the sealing surface.
  • the sidewalls have an innermost surface and the base, first and second sealing surfaces, and lip have an uppermost surface.
  • a sealant material is bonded to the innermost surface of the sidewalls and on the uppermost surfaces of the base, first and second sealing surfaces, and lip.
  • a product is positioned within the support member and a first, permeable film is sealed to the support member at the first interior sealing surface of the flange to thereby enclose the product.
  • a second, impermeable film is peelably sealed to the support member at the second, exterior sealing surface of the flange to thereby enclose the permeable film.
  • the impermeable film extends outwardly from the second, exterior sealing surface and is not sealed to said lip.
  • the peel-initiation lip minimizes the liklihood that the retail worker will inadvertently grip and pull the sealant film bonded to the support member when attempting to remove the impermeable film.
  • Fig. 1 is a perspective view of a package, according to the invention.
  • Fig. 2 is an enlarged view of the cut edge of the tray of the package of Figure 1 ;
  • Fig. 3 is a cross-sectional view of the package of Figure 1;
  • Fig. 4 is a cross-sectional view of the package of Figure 1 as is shown in Figure 3 with the impermeable film being peeled from the tray;
  • Fig. 5 is a cross-sectional view of another package in accordance with the present invention
  • Fig. 6 is a cross-sectional view of the package of Figure 5 with the impermeable portion of the multilayer film being peeled from the permeable portion;
  • Fig. 7 is an enlarged view of the flange of the package of Figures 5 and 6 demonstrating the delamination mechanism of the multilayer film.
  • the present invention generally relates to a package for products, particularly fresh red meat products, having a support member or tray, and a film sealed about a peripheral flange of the tray.
  • the support member of the present invention is a barrier foam tray as discussed above.
  • all composite trays which are formed of multilayer laminated or coextruded materials and which are subject to delamination or cohesive failure are within the scope of the present invention.
  • Examples of composite support members within the scope of the present invention are trays formed of polymeric or paperboard substrates having a sealant film laminated thereto, trays formed of substrates having a sealant layer coated thereon, and trays formed from multilayer, coextruded sheets having an outer sealant layer.
  • the present invention is generally directed to a package having a product contained within such a tray with a lidding film sealed to the flange of the tray, it is specifically directed to a package for products, particularly fresh red meat products, having a composite tray, an inner permeable film sealed to the flange of the tray, and an outer impermeable film sealed either to flange of the tray or to the permeable film.
  • the peel initiation mechanism provided by the present invention may be advantageously employed on any package having a lidding film peelably sealed to a composite tray such that the lidding film may be easily removed by peeling it from the tray.
  • the present invention is generally directed to a package having a film sealed to a single sealing surface on the flange of a tray, it is particularly directed to a package having one, preferably permeable film sealed to a first sealing surface of the flange and another, preferably impermeable film sealed either to a second sealing surface of the flange or to the permeable film itself.
  • the permeable film of the present invention is an oxygen permeable or non-barrier film which may be a formable or stretchable material.
  • Typical polymeric materials for the present permeable film may include any material which may be securely sealed or bonded to the support member and which provides a sufficient gas permeability as discussed above.
  • olefinic polymers are preferred and most preferred are ethylenic polymers such as polyethylene or any of a variety of ethylene copolymers including, for example, ethylene vinyl acetate, ethylene acrylate copolymers, ethylene acrylic acid copolymers including metal neutralized salts thereof, and ethylene alpha-olefin copolymers.
  • ethylene alpha-olefins may be heterogeneous or homogeneous in nature.
  • ethylene alpha-olefins which have been formed by conventional Zeigler-Natta catalysis and are heterogeneous in nature, such as linear low density polyethylene (LLDPE), are within the scope of the present invention as well as such copolymers which are formed by single site catalysis, such as any of a variety of forms of metallocene catalyst technology, and are homogeneous in nature are also within the scope of the present invention.
  • a preferred permeable film for use in accordance with the present invention is a symmetrical, five layer oriented film having the structure:
  • EVA / LLDPE / EVA / LLDPE / EVA although a wide variety of permeable films may be employed.
  • the impermeable film of the present invention may be any suitable barrier film or laminate which is substantially impermeable to gas such as oxygen so that a fresh meat product contained in a vacuum or other low oxygen atmosphere possesses an enhanced shelf life over a package without the barrier layer.
  • suitable polymeric materials having gas barrier properties for use in the present invention include ethylene vinyl alcohol copolymers, vinylidene chloride copolymers (PVDC) such as vinylidene chloride vinyl chloride or vinylidene chloride methyl acrylate.
  • PVDC vinylidene chloride copolymers
  • Laminates of a sealable film and a barrier structure which includes a barrier layer and a tough, non-forming material such as a biaxially oriented nylon or biaxially oriented polyester are especially preferred for use as the impermeable lidding of the present inventive package.
  • An exemplary film structure for the impermeable web is polyamide/tie/polyamide/EVOH/polyamide/tie/LLDPE/LLDPE and/or EVA (where "tie” is a tie or adhesive layer). Such film is preferably cast-coextruded.
  • An alternative film structure is a saran-coated, biaxially-oriented polyamide film adhesively laminated to the following coextruded film: EVA/LLDPE PE and/or PP and/or EVA.
  • the films which may be employed in accordance with the present invention may be monolayer or multilayer.
  • Multilayer films may be employed when all of the properties required of the film cannot be achieved by a single polymeric component or a blend of polymers in a single layer.
  • an impermeable film to be sealed to a tray in all likelihood will comprise a multilayer film because several properties are needed including peelable sealability, oxygen barrier, and impact and/or outer abuse properties.
  • the film employed will most likely contain three layers at a minimum: a seal layer, a barrier layer, and an outer abuse layer. Further internal layers such as adhesive layers and bulk layers may also be included.
  • Laminates of sealable films and nonforming materials such as biaxially oriented polyester or biaxially oriented nylon are also within the scope of the present invention and are widely recognized as superior lidstocks for tray-type packages.
  • films in accordance with the present invention will be extruded or coextruded through either a slot die or an annular die forming either a sheet or a tube, respectively. While the extruded polymeric material is still in a molten state the sheet or tube may be expanded by stretching or blowing to achieve a desired dimension. The film is then cooled, slit to desired widths and taken up as a roll. Such rolls of film are employed in the packaging process as is discussed in greater detail below.
  • Figure 1 shows a package 10 in accordance with the present invention having a composite tray or support member 12 with a cavity 14 defined by base 7 and sidewalls 9 for receiving a product 16 and an upper flange 18 which includes inner sealing surface 20, outer sealing surface 22, and lip 24.
  • Tray 12 has been thermoformed from a three layer composite material having an upper sealant film 11, foam core 13, and outer film 15 and cut at edges 17.
  • Figure 2 provides an enlarged view of edge 17. From Figures 3 and 4 it may be discerned that sealant film 11 is bonded to the uppermost surface of base 7, the innermost surfaces of the sidewalls 9, inner sealing surface 20, outer sealing surface 22, and the uppermost surface of the lip 24.
  • impermeable film 26 is sealed to the support member at outer sealing surface 22.
  • a peelable seal is formed between the impermeable film 26 and outer sealing surface 22 such that the outer impermeable film may be readily removed from the package at retail.
  • film 26 extends beyond outer sealing surface 22.
  • Lip 24 extends downwardly from outer sealing surface 22 such that film 26 may be readily grasped for ease of removal.
  • Figure 4 shows film 26 being removed with underlying permeable film 24 sealed to inner sealing surface 20 and with composite tray 12 remaining intact.
  • a tray having non-stepped sealing surfaces may be employed in the present invention so long as the impermeable film seal is formed external to the permeable film seal and the lip is stepped down from the external sealing surface.
  • Such non- stepped flange may include those of the type having an inner sealing surface, a coplanar outer sealing surface, and a downwardly extending groove separating the two wherein the groove provides for easy cutting of the permeable film following sealing to the first inner sealing surface.
  • trays having a single sealing surface wherein the permeable film may be sealed interior to the impermeable film seal are also within the scope of the present invention.
  • FIG. 5 shows a package 110 in accordance with the present invention having a composite tray or support member 112 with a cavity 114 defined by base 107 and sidewalls 109 for receiving a product 116 and an upper flange 118 which includes sealing surface 120 and lip 124.
  • Tray 112 has been thermoformed from a three layer composite material having an upper sealant film 111, foam core 113, and outer film 115 and cut at edges 117.
  • Film 126 is sealed to the support member at sealing surface 120. Film 126 extends beyond sealing surface 120 and lip 124 extends downwardly from sealing surface 120 such that film 126 may be readily grasped.
  • film 126 is a multilayer, coextruded film which is capable of delaminating into a permeable portion 130 and an impermeable portion 132.
  • the force required to delaminate upper, impermeable portion 132 from lower, permeable portion 130 is much less than the force required to break the seal between the film and sealing surface 120 such that grasping and pulling film 126 delaminates the film, leaving permeable portion 130 sealed to sealing surface 120, rather than peeling the entire film from the tray.
  • Figure 7 shows in greater detail the mechanism by which film 126 delaminates. That is, when the retail worker initially grasps and pulls on film 126 the entire structure, including permeable portion 130 and impermeable portion 132 is being pulled. When the pulling pressure reaches the seal between the film and sealing surface 120 the film begins to rupture until the weak layer-to-layer interface is reached between permeable portion 130 and impermeable portion 132.
  • a variety of multilayer film structures are useful in accordance with the present embodiment and are capable of such delamination.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)

Abstract

L'invention concerne un emballage (10) permettant une utilisation en boucherie et l'emballage de viande rouge fraîche dans une installation centralisée, lequel comprend un élément de support composite (12) tel qu'une barquette en mousse formant barrière, destinée à recevoir et à porter la viande, un film perméable renfermant la viande ainsi qu'un film imperméable renfermant le film perméable restant en place pendant la distribution et ôté lors de la vente au détail. Le film imperméable est scellé sur une surface de scellement (22) sur le bord de la barquette. Une languette (24) est positionnée au-dessous de la surface de scellement et présente un point d'amorce de pelage permettant de retirer le film imperméable lors de la vente au détail avec peu de défectuosité de l'emballage.
PCT/US1997/016973 1996-10-18 1997-10-16 Emballage a mecanisme d'amorce de pelage Ceased WO1998017546A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU48017/97A AU4801797A (en) 1996-10-18 1997-10-16 Package having peel initiation mechanism

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73384396A 1996-10-18 1996-10-18
US08/733,843 1996-10-18

Publications (1)

Publication Number Publication Date
WO1998017546A1 true WO1998017546A1 (fr) 1998-04-30

Family

ID=24949335

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/016973 Ceased WO1998017546A1 (fr) 1996-10-18 1997-10-16 Emballage a mecanisme d'amorce de pelage

Country Status (3)

Country Link
AR (1) AR013848A1 (fr)
AU (1) AU4801797A (fr)
WO (1) WO1998017546A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1160175A1 (fr) * 2000-05-31 2001-12-05 Brodrene Hartmann A/S Récipient revêtu avec rebord
EP1354691A1 (fr) * 1999-12-31 2003-10-22 Elopak Systems Ag Procédé et dispositif de moulage par soufflage des feuilles et récipients ainsi obtenus
EP2412643A1 (fr) * 2010-07-29 2012-02-01 MULTIVAC Sepp Haggenmüller GmbH & Co KG Emballage de produit et machine d'emballage pour la fabrication de ce type d'emballage de produit
WO2016180722A1 (fr) * 2015-05-08 2016-11-17 Torus Pak Research And Development S.À R.L Emballage alimentaire avec base protectrice
US10017317B2 (en) 2005-04-28 2018-07-10 Torus Pak Research And Development S.A.R.L. Food package and method for transfer of food

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055672A (en) * 1972-04-10 1977-10-25 Standard Packaging Corporation Controlled atmosphere package
WO1994027868A2 (fr) * 1993-05-20 1994-12-08 World Class Packaging Systems, Inc. Systemes d'emballage permettant une augmentation de la duree de conservation des denrees alimentaires
EP0707955A1 (fr) * 1994-10-19 1996-04-24 W.R. Grace & Co.-Conn. Laminé comportant un film et un substrat
EP0721899A1 (fr) * 1995-01-11 1996-07-17 W.R. Grace & Co.-Conn. Emballage avec couvercle en feuille rétractable
WO1996039342A1 (fr) * 1995-06-06 1996-12-12 W.R. Grace & Co.-Conn. Emballage a double enveloppe pour atmosphere controlee

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055672A (en) * 1972-04-10 1977-10-25 Standard Packaging Corporation Controlled atmosphere package
WO1994027868A2 (fr) * 1993-05-20 1994-12-08 World Class Packaging Systems, Inc. Systemes d'emballage permettant une augmentation de la duree de conservation des denrees alimentaires
EP0707955A1 (fr) * 1994-10-19 1996-04-24 W.R. Grace & Co.-Conn. Laminé comportant un film et un substrat
EP0721899A1 (fr) * 1995-01-11 1996-07-17 W.R. Grace & Co.-Conn. Emballage avec couvercle en feuille rétractable
WO1996039342A1 (fr) * 1995-06-06 1996-12-12 W.R. Grace & Co.-Conn. Emballage a double enveloppe pour atmosphere controlee

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1354691A1 (fr) * 1999-12-31 2003-10-22 Elopak Systems Ag Procédé et dispositif de moulage par soufflage des feuilles et récipients ainsi obtenus
EP1160175A1 (fr) * 2000-05-31 2001-12-05 Brodrene Hartmann A/S Récipient revêtu avec rebord
WO2001092119A3 (fr) * 2000-05-31 2002-03-14 Hartmann As Brdr Contenant
US10017317B2 (en) 2005-04-28 2018-07-10 Torus Pak Research And Development S.A.R.L. Food package and method for transfer of food
EP2412643A1 (fr) * 2010-07-29 2012-02-01 MULTIVAC Sepp Haggenmüller GmbH & Co KG Emballage de produit et machine d'emballage pour la fabrication de ce type d'emballage de produit
WO2016180722A1 (fr) * 2015-05-08 2016-11-17 Torus Pak Research And Development S.À R.L Emballage alimentaire avec base protectrice

Also Published As

Publication number Publication date
AU4801797A (en) 1998-05-15
AR013848A1 (es) 2001-01-31

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