EP1584567A2 - Fermeture à ouverture facile pour un conteneur stérilisable - Google Patents

Fermeture à ouverture facile pour un conteneur stérilisable Download PDF

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Publication number
EP1584567A2
EP1584567A2 EP04257809A EP04257809A EP1584567A2 EP 1584567 A2 EP1584567 A2 EP 1584567A2 EP 04257809 A EP04257809 A EP 04257809A EP 04257809 A EP04257809 A EP 04257809A EP 1584567 A2 EP1584567 A2 EP 1584567A2
Authority
EP
European Patent Office
Prior art keywords
polypropylene
coating
membrane
heat
metal end
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Withdrawn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
EP04257809A
Other languages
German (de)
English (en)
Other versions
EP1584567A3 (fr
Inventor
Alan Williams
Brian E. Nelson
Jeremy E. Morin
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.)
Sonoco Development Inc
Original Assignee
Sonoco Development 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 Sonoco Development Inc filed Critical Sonoco Development Inc
Publication of EP1584567A2 publication Critical patent/EP1584567A2/fr
Publication of EP1584567A3 publication Critical patent/EP1584567A3/fr
Withdrawn legal-status Critical Current

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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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/50—Non-integral frangible members applied to, or inserted in, preformed openings, e.g. tearable strips or plastic plugs
    • B65D17/501—Flexible tape or foil-like material
    • B65D17/502—Flexible tape or foil-like material applied to the external part of the container wall only
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/001—Action for opening container
    • B65D2517/0013—Action for opening container pull-out tear panel, e.g. by means of a tear-tab
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/5002—Details of flexible tape or foil-like material
    • B65D2517/5008—Details of flexible tape or foil-like material with a sealing coat
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/5002—Details of flexible tape or foil-like material
    • B65D2517/5013—Details of flexible tape or foil-like material the tape covering almost the whole of the container end panel
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/5002—Details of flexible tape or foil-like material
    • B65D2517/5024—Material
    • B65D2517/5032—Laminated
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/504—Details of preformed openings
    • B65D2517/5043—Details of preformed openings provided with a flange
    • B65D2517/5045—Down-turned flange, i.e. extending into container
    • B65D2517/5048—Down-turned flange, i.e. extending into container rolled or folded back, e.g. to avoid sharp edges
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/504—Details of preformed openings
    • B65D2517/5056—Details of preformed openings the edge of the preformed opening having a covering element or coating, e.g. to prevent cutting or for sealing purposes

Definitions

  • the present invention relates to a container having a closure formed by a metal end joined to a top end of the container and defining an opening through which contents of the container are dispensed, and a peelable membrane sealed to the metal end so as to hermetically close the opening.
  • the invention relates more particularly to such a container closure that is capable of withstanding a retort sterilization process without failing, but that has a controlled peel strength that is sufficiently low to be readily openable by hand.
  • retort containers A variety of food products are packaged in containers that, after filling and sealing, are subjected to a retort sterilization process to render the filled containers shelf-stable such that they do not require refrigeration until opened (referred to herein as "retort containers").
  • the retort process typically involves elevating the temperature of the filled and sealed container to about 250-260°F for about one hour. During the retort process, pressure builds up in the container. It is critical that the container closure not fail or leak during or after the retort process.
  • One type of closure includes a metal end that is attached to the top of the container, typically by double-seaming the metal end to a flange at the top of the container, and a flexible membrane that is sealed to the metal end so as to cover an opening defined therein.
  • the membrane generally includes a metal foil layer and may include one or more additional layers such as polymer and/or paper.
  • One side of the foil layer typically is sealed to the metal end on the container using suitable sealing materials. Heat sealing is generally employed to seal the membrane to the metal end.
  • the sealing material used for attaching the membrane to the metal end must have a sufficiently high melting temperature so that the strength of the seal during the retort process is not impaired to such an extent that the seal fails.
  • Polypropylene has commonly been used as the sealing material for retort containers because it is heat-sealable and has a melting point exceeding the temperature of the retort process.
  • a heat-seal layer of polypropylene is disposed on the lower side of the membrane.
  • a coating of polypropylene is applied to the metal end, for example by applying a composition comprising polypropylene suspended in an organic solution and then evaporating the solvent. After filling of the container, the membrane is sealed to the metal end by heat-sealing the polypropylene heat-seal layer on the membrane to the polypropylene coating on the metal end.
  • the polypropylene-to-polypropylene bond is strong enough to withstand the retort process. However, the bond tends to be so strong that the peel force required to peel the membrane from the metal end is unacceptably high.
  • the easy-peel closures generally include some type of failure mechanism in a heat-seal layer on the membrane so that the heat-seal layer fails internally.
  • a controlled defect is designed into the heat-seal layer by adding incompatible polymers, fillers, or both, to polypropylene or other heat-sealable polymer such as polyethylene.
  • polypropylene or other heat-sealable polymer such as polyethylene.
  • incompatible polymers, fillers, or both such as polyethylene.
  • polypropylene or other heat-sealable polymer such as polyethylene.
  • Talc has been used as a filler in polypropylene as well as in polyethylene.
  • the incompatible polymers and fillers work on the principle of creating a weakness within the heat-seal layer to initiate a crack in the layer when the membrane is peeled from the metal end.
  • the membrane has included a coextruded heat-seal layer comprising a layer of polypropylene coextruded with a layer of polypropylene to which fillers and/or incompatible polymers have been added, and the intended failure mechanism is a delamination between the coextruded layers as a result of a weakening of their bond caused by the added fillers and/or polymers.
  • Such membranes having controlled defects are relatively complex and thus tend to be relatively expensive to produce.
  • the present invention provides a retortable, easily openable closure of the type having a metal end and a membrane, wherein the failure mechanism during peeling of the membrane from the metal end is not a cohesive failure within the heat-seal layer on the membrane.
  • the heat-seal layer on the membrane in accordance with the invention does not require incompatible polymers or fillers to be added, nor does it require a coextruded structure, because the failure mechanism involves a failure between the heat-seal layer on the membrane and a corresponding heat-seal coating on the metal end. Accordingly, the heat-seal layer on the membrane is simplified and therefore less costly.
  • the metal end has a coating of a heat-seal composition comprising a food-compatible metal-coating composition with polypropylene dispersed therein.
  • the polypropylene disperses within the food-compatible metal-coating composition during curing of the coating on the metal end such that an outer surface of the coating defines a multitude of separate, spaced islands of polypropylene dispersed within the food-compatible metal-coating composition so as to form bonding sites.
  • the polypropylene islands are microscopic in scale.
  • the membrane's lower surface has a heat-seal layer thereon, comprising a layer of polypropylene.
  • the polypropylene heat-seal layer on the membrane is heat-sealed to the coating on the metal end, whereby the polypropylene heat-seal layer bonds to the bonding sites on the coating.
  • the peel strength of the resulting bond depends on the fraction of the coating's surface area that is represented by the bonding sites. As the collective area of the bonding sites becomes a greater fraction of the coating's total surface area, the peel strength increases.
  • the heat-seal layer of polypropylene on the membrane bonds to the membrane with a strength exceeding that between the heat-seal layer and the coating on the metal end, such that when the membrane is pulled to open the container, the failure occurs between the heat-seal layer on the membrane and the coating on the metal end.
  • a controlled low peel strength can be achieved by suitably formulating the polypropylene-filled metal-coating composition.
  • FIGS. 1 through 3 illustrate one embodiment of the invention relating to a metal end and membrane closure for a retortable container.
  • the container 10 includes a flange 12 at its top end, the flange projecting radially outwardly in an initial state (not shown) of the container prior to incorporation of a closure.
  • the closure for the container includes a metal end 14 attached to the top end of the container, such as by double-seaming the metal end with the flange as shown.
  • the metal end 14 defines an opening 16 through which contents of the container can be dispensed.
  • the metal end includes a generally horizontal upper surface 18 that encircles the opening 16 .
  • the closure also includes a flexible membrane closure 20 that is sealed to the upper surface 18 of the metal end to hermetically seal the container.
  • the membrane closure advantageously includes a pull tab 22 that is not sealed to the metal end so that it can be readily grasped and pulled to remove the membrane from the metal end.
  • the membrane closure 20 is heat-sealed to the metal end 14 by cooperative heat-seal layers applied to the closure and metal end. More particularly, a heat-seal layer 24 (FIG. 2) is applied to the upper surface 18 of the metal end.
  • the heat-seal layer 24 comprises a food-compatible metal-coating composition into which polypropylene is blended.
  • the food-compatible metal-coating composition should bond well to metal and should have good corrosion resistance, and should be capable of withstanding a retort process without substantially degrading.
  • Various food-compatible metal-coating compositions can be used in the practice of the invention, including but not limited to epoxies, plastisols, polyesters, food-grade lacquers, and others.
  • the surface of the resulting heat-seal layer 24 is characterized by a multitude of microscopic spaced "islands" 26 of polypropylene that are dispersed within the matrix of the epoxy 28 (see FIG. 3). These polypropylene islands 26 comprise bonding sites to which the membrane closure 20 can be sealed as further described below.
  • the membrane 20 can include various layers to provide desired gas and moisture barrier properties and to have sufficient tear-resistance; such layers can include one or more of a metal foil, a polymer layer (e.g., polyethylene terephthalate), a kraft paper layer, a lacquer layer, etc.
  • the membrane 20 includes a metal foil layer 30 and a polymer layer 32 laminated to the upper side of the foil layer.
  • the foil layer provides gas and moisture barrier properties, but would be easily tearable if not reinforced.
  • the polymer layer imparts tear-resistance to the membrane and can also impart additional barrier properties.
  • a heat-seal layer 36 is applied to the lower surface of the membrane 20 .
  • the heat-seal layer 36 does not require fillers or incompatible polymers and need not be a complex coextruded laminate as in the prior art, because the heat-seal layer 36 is not intended to fail within itself when the membrane is peeled from the metal end. Instead, the intended failure mode is an adhesive failure between the heat-seal layer 36 on the membrane and the heat-seal layer 24 on the metal end.
  • the heat-seal layer 36 comprises a layer of polypropylene without the addition of any other components such as fillers or incompatible polymers that would substantially affect the ability of the layer 36 to remain substantially intact during removal of the membrane from the metal end.
  • the polypropylene of the heat-seal layer 36 bonds to the polypropylene bonding sites 26 on the metal end when the membrane is heat-sealed to the metal end.
  • the bond between the membrane and the metal end is not as strong as the bond that would exist if the heat-seal layer 24 were pure polypropylene.
  • such a bond between two pure polypropylene layers would be too strong to allow the membrane to be readily peeled from the metal end.
  • the bond between the polypropylene layer 36 and the epoxy/polypropylene layer 24 is weaker because less than the full surface area of the layer 24 is bonded to the polypropylene layer 36 of the membrane.
  • the peel strength of the bond between the membrane 20 and the metal end 14 can be controlled by varying the fraction of the total surface area of the heat-seal layer 24 that is made up of the polypropylene bonding sites or islands 26 .
  • This fraction is a function primarily of the relative proportions of the metal-coating composition and polypropylene making up the heat-seal material of the layer 24 .
  • the polypropylene advantageously comprises from about one percent to about 20 percent by weight of the composition, and suitably can comprise about 10 percent by weight of the composition.
  • the closure system in accordance with the invention is suitable for retort containers.
  • Polypropylene has a melting temperature of about 160°C (about 280°F), and thus can withstand a retort process, which typically involves heating a sealed container to about 250 to 260°F for about one hour.
  • the closure system in accordance with the invention also can provide a relatively low peel strength between the membrane and the metal end.
  • a series of peel strength tests were conducted to assess the peel strength of a closure system in accordance with the invention as well as a number of prior-art closure systems. The tests also sought to determine whether the peel strength is affected by subjecting the closure to an elevated temperature similar to a retort process.
  • Five different closure configurations were tested. In each configuration, a sheet metal precursor or blank from which a metal end is made had a coating of an identical Watson Rhenania epoxy/polypropylene blend applied to it and cured, such that the sheet metal precursors in all cases had substantially identical heat-seal layers of the epoxy/polypropylene composition.
  • the surface of the heat-seal layer included polypropylene islands dispersed in the epoxy matrix generally as shown in FIG. 3.
  • the membranes were heat-sealed to the sheet metal precursors with 40 psi pressure for one second at 400°F with a rubber bar under the precursor to help ensure that a uniform pressure was applied over the surface of the membrane.
  • membrane structures used in the five test configurations are shown in Table I below: Membrane Structures Tested Membrane Configuration Layer 1 Layer 2 Heat-Seal Layer A 1 ⁇ m lacquer 62 ⁇ m foil Coex PP/PP mixed with LDPE and filled with talc B 1 ⁇ m lacquer 72 ⁇ m foil Coex PP/PP mixed with HDPE C 16 ⁇ m PET 21 ⁇ m foil PP mixed with LDPE D 3 ⁇ m lacquer 66 ⁇ m foil LDPE mixed with HDPE and filled with talc E 12 ⁇ m PET 9 ⁇ m foil PP
  • Configuration A was a Lawson Mardon Gold Foil membrane
  • configuration B was a Lawson Mardon Silver Foil membrane
  • configuration C was a Lawson Mardon PET film membrane
  • configuration D was an Alcoa membrane
  • configuration E was a membrane in accordance with one embodiment of the present invention.
  • Samples of each test configuration were subjected to a peel test with an Instron tester with a T-peel geometry, and the maximum peel load per inch width of the membrane was recorded.
  • Some samples of each configuration were subjected to simulated retort conditions by heating the samples to 250°F for one hour, with a 15-minute heat-up period and a 15-minute cool-down period. The peel test was done for each configuration both before the retort process and after the retort process.
  • the invention allows a membrane and metal end closure to be constructed with a relatively simple membrane structure.
  • the closure is able to withstand a retort process without substantial degradation of the bond strength between the membrane and the metal end.
  • the peel force required to remove the membrane can be controlled to be relatively low so that the membrane is readily removable.
  • the invention allows the peel force to be controlled in a simple fashion by suitably varying the proportions of epoxy and polypropylene in the heat-seal composition applied to the metal end.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)
  • Closures For Containers (AREA)
  • Wrappers (AREA)
EP04257809A 2004-01-05 2004-12-15 Fermeture à ouverture facile pour un conteneur stérilisable Withdrawn EP1584567A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/751,756 US20050145630A1 (en) 2004-01-05 2004-01-05 Easily openable closure for a retortable container having a metal end to which a membrane is sealed
US751756 2004-01-05

Publications (2)

Publication Number Publication Date
EP1584567A2 true EP1584567A2 (fr) 2005-10-12
EP1584567A3 EP1584567A3 (fr) 2006-11-02

Family

ID=34711495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04257809A Withdrawn EP1584567A3 (fr) 2004-01-05 2004-12-15 Fermeture à ouverture facile pour un conteneur stérilisable

Country Status (8)

Country Link
US (1) US20050145630A1 (fr)
EP (1) EP1584567A3 (fr)
JP (1) JP2005231741A (fr)
AU (1) AU2004235675B2 (fr)
BR (1) BRPI0500055A (fr)
CA (1) CA2489218A1 (fr)
EC (1) ECSP055526A (fr)
MX (1) MXPA05000292A (fr)

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US9617056B2 (en) 2006-02-03 2017-04-11 Ardagh Mp Group Netherlands B.V. Expandable container having lid for providing headspace control in a food can

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US20050252918A1 (en) * 2004-05-11 2005-11-17 Sonoco Development, Inc. Container having a metal end to which a membrane is sealed
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US9475620B2 (en) * 2010-11-29 2016-10-25 Crown Packaging Technology, Inc. Closure
US8939695B2 (en) 2011-06-16 2015-01-27 Sonoco Development, Inc. Method for applying a metal end to a container body
US8998027B2 (en) 2011-09-02 2015-04-07 Sonoco Development, Inc. Retort container with thermally fused double-seamed or crimp-seamed metal end
US9114925B2 (en) 2011-09-13 2015-08-25 Lincoln Global, Inc. Container for elongated articles
US10131455B2 (en) 2011-10-28 2018-11-20 Sonoco Development, Inc. Apparatus and method for induction sealing of conveyed workpieces
US10399139B2 (en) 2012-04-12 2019-09-03 Sonoco Development, Inc. Method of making a retort container
US20140202920A1 (en) * 2013-01-22 2014-07-24 Hudsonville Products LLC Container for harvested fruits and vegetables
US20150158655A1 (en) * 2013-12-10 2015-06-11 P.T. Toba Surimi Industries Packaged Crabmeat Product
US10239667B2 (en) 2014-06-18 2019-03-26 Sonoco Development, Inc. Closure for retort container
FR3063254B1 (fr) * 2017-02-27 2019-03-22 Saint-Gobain Glass France Procede d'encapsulation
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US10017313B2 (en) 2006-02-03 2018-07-10 Ardagh Mp Group Netherlands B.V. Expandable container having lid for providing headspace control in a food can

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CA2489218A1 (fr) 2005-07-05
EP1584567A3 (fr) 2006-11-02
US20050145630A1 (en) 2005-07-07
ECSP055526A (es) 2005-11-22
MXPA05000292A (es) 2005-08-19
JP2005231741A (ja) 2005-09-02
AU2004235675A1 (en) 2005-07-21
BRPI0500055A (pt) 2005-09-06
AU2004235675B2 (en) 2007-02-01

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