EP2951015A1 - Opercule soudable pour la pasteurisation - Google Patents

Opercule soudable pour la pasteurisation

Info

Publication number
EP2951015A1
EP2951015A1 EP14705698.0A EP14705698A EP2951015A1 EP 2951015 A1 EP2951015 A1 EP 2951015A1 EP 14705698 A EP14705698 A EP 14705698A EP 2951015 A1 EP2951015 A1 EP 2951015A1
Authority
EP
European Patent Office
Prior art keywords
coex
layer
coating
lid according
lid
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Withdrawn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
EP14705698.0A
Other languages
German (de)
English (en)
Inventor
Ole BRØDSGAARD
Peter Johansen
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.)
Danapak Flexibles AS
Original Assignee
Danapak Flexibles AS
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 Danapak Flexibles AS filed Critical Danapak Flexibles AS
Publication of EP2951015A1 publication Critical patent/EP2951015A1/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Withdrawn legal-status Critical Current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
    • B32B27/06—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
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • 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
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • 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
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • 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
    • B32B2439/40—Closed containers
    • 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

Definitions

  • the present invention relates to a lid for welding on and closing a package, preferably a disposable package of a polymer material, said lid comprising a metallized layer. More particularly, the invention relates to a weldable lid which tolerates pasteurization with temperatures up to 95 °C.
  • Pasteurization of the contents of disposable packages poses the problem that a welded lid on the package will frequently work loose during heating because of the increasing vapour pressure.
  • ready-punched lids wafers
  • top web films which have sufficient adhesion, but owing to problems of curl (rolling of the material) these cannot be punched for loose lids.
  • the lids comprise a metallized layer which is necessary to give a sufficient oxygen barrier in the product, so that any microorganisms, which have survived the pasteurization, do not receive oxygen to a problematic extent.
  • COEX coating a laminated sheet, which is produced by co-extrusion of at least two polymers, at least one of which is formed by a polyolefin.
  • COEX coating a laminated sheet, which is produced by co-extrusion of at least two polymers, at least one of which is formed by a polyolefin.
  • European Patent Application EP 2 100 729 A1 describes a multilayer sheet which lends itself for use in packages to be heat treated, e.g. pasteurized. The layers are co-extruded to achieve a directionally oriented stretched sheet which exhibits low shrinkage when subjected to high temperatures. A layer of the sheet may be metallized or coated with a ceramic material.
  • the object of the invention is to provide an alternative lid for packages which are to be subjected to heat treatment.
  • the invention relates to a lid for welding on and closing a package, preferably a disposable package of a polymer material, said lid comprising a PET sheet with a thickness from 23 to 50 ⁇ , on one side of which a metallized layer is applied, said metallized layer having applied thereon a COEX coating in an amount of from about 8 to about 40 g/m 2 , preferably 10 to about 35 g/m 2 , or preferably 10 to about 25 g/m 2 , said COEX coating containing a polymer which is selected to as to be compatible with the polymer material in the package.
  • the invention provides a lid which may be secured to a package, and which will not work loose when the package with contents is subjected to a heat treatment.
  • the polymer which is compatible with the polymer material of the package, is preferably selected to as to correspond to the polymer material in the package.
  • the COEX coating comprises at least two layers, where the one layer forms a welding layer, and the other layer is a layer capable of binding to the metallized layer on the PET sheet. In some embodiments, the COEX coating will comprise two layers, and in other embodiments three layers. Also, lids may be produced where the COEX coating comprises four or five layers or optionally more layers.
  • the COEX coating comprises at least one acid polymer.
  • the acid polymer is present in the layer which binds to the metallized layer.
  • the layer may be formed by a resin which contains the acid polymer, i.e. the acid polymer fully or partly constitutes a layer in the COEX coating, said layer facing toward the metallized layer.
  • the acid proportion in the acid polymer constitutes from about 3 to about 18 percent by weight, preferably 3 to 13 percent by weight, more preferably 3 to 9 percent by weight.
  • the acid polymer may be selected from several possible acid polymers, it has been found that acid polymers selected from EAA (ethylene acrylic acid), EMAA (ethylene methacrylic acid) or co-polymer (ethylene acrylate MAH) give a layer with a particularly good adhesion.
  • EAA ethylene acrylic acid
  • EMAA ethylene methacrylic acid
  • co-polymer ethylene acrylate MAH
  • the welding layer in the COEX coating is made from a resin which consists of one or more of the polymers: PP (polypropylene), PET (polyester), PS (polystyrene), HDPE (high density polyethylene) and/or PVC (polyvinyl chloride).
  • PP polypropylene
  • PET polyyester
  • PS polystyrene
  • HDPE high density polyethylene
  • PVC polyvinyl chloride
  • the mentioned polymers frequently constitute the material in typical disposable packages, and, therefore, it will typically be possible to select from the mentioned resins a resin which is compatible with the polymer material in the package.
  • the COEX coating may comprise one or more layers which are disposed between the two mentioned layers.
  • the intermediate layer or layers may consist of resins which contain PE (polyethylene), EAA (ethylene acrylic acid), EMAA (ethylene methacrylic acid), PE-TER-polymer or a combination of these.
  • the intermediate layer or layers may form a transition between the welding layer and the layer binding to the metallization layer, whereby the risk of delamination may be reduced additionally.
  • melt index (MFI) of the polymers may be relevant.
  • Melt index for polymers is measured in accordance with the standards ISO 1133 and ASTM D1238.
  • PE and PP are some of the most frequently used polymers, and for these measurements in accordance with the standards for PE are: 190 °C, 2.16 kg (ISO 1133 and ASTM D1238), and for PP are: 230 °C, 2.16 kg (ISO 1133).
  • melt index (MFI) for PP is 10-30 g/10 min.
  • the difference in melt index between two layers in contact with each other in the COEX coating is important for the ability to coat in homogeneous layers with an even layer thickness, since the smaller the difference in melt index is, the easier it is to produce a coating with homogeneous layers with an even layer thickness. Therefore, the invention also provides embodiments where the difference in melt index (MFI) between two layers in contact with each other in the COEX coating does not exceed 8, preferably does not exceed 4-6.
  • MFI melt index
  • the difference in acid content in percent by weight between layers which are in contact with each other should not be too great either owing to the adhesion, and it is preferred to use polymers where the difference in acid content between two layers in contact with each other in the COEX coating is 7% at most, preferably 5% at most.
  • the new lid provides the following advantages:
  • PET sheet It is possible to use a thinner PET sheet. It is e.g. possible to use 36 ⁇ PET, it having been found to be possible to use 23 -50 ⁇ PET. 50 ⁇ PET is used on the wafers known till know.
  • the welding layer used is a co-extruded polymer layer - a COEX coating - which consists of at least two layers, but which preferably consists of 3 layers. Between 10 and 25 g/m 2 co-extruded polymer layer may be used as a welding layer, e.g. 22 g/m 2 . Depending on how the equipment is configured, it is possible to reduce the consumption to e.g. 5-17 g/m 2 , or right down to e.g. 10-15 g/m 2 .
  • the COEX coating adheres so well to the metallization at the top, and the welding side so well to the package, e.g. a cup, that it does not come loose because of the temperature, and it has so far been found that the vapour pressure in the cup does not knock off the lid according to the invention either.
  • the metallization layer on the PET film is generally necessary to give a sufficient oxygen barrier in the product, so that any microorganisms, which have survived the pasteurization, do not receive oxygen to a problematic extent, which may be the case if a non-metallized film is used.
  • the metallization layer may e.g. consist of aluminium which has been vapour- deposited on the PET film. It is possible to produce a weldable lid which can withstand pasteurization, which means a temperature of 95 °C for at least 1 hour.
  • COEX coatings may be produced e.g. for welding against: PP (polypropylene), PET (polyester); PS (polystyrene), HDPE (high density polyethylene) as well as PVC (polyvinyl chloride).
  • PP polypropylene
  • PET polyyester
  • PS polystyrene
  • HDPE high density polyethylene
  • PVC polyvinyl chloride
  • Figure 1 shows the structure of a traditional lid with welding lacquer
  • FIG. 2 shows the structure of the lid according to the invention.
  • Figure 3 shows a lid according to the invention with a COEX coating with 3 layers.
  • Figure 1 shows the layers in a traditionally produced weldable lid 1 , which may be used for packages where the contents are to be pasteurized.
  • the lid comprises a layer of PET 2 with a thickness of 50 ⁇ .
  • the PET layer 2 has applied thereon a metallized layer 3, on which a layer 4 with welding lacquer in an amount of 3-6 g/m 2 is applied in turn.
  • FIG 2 shows the layers of a lid 10 according to the invention.
  • This lid also comprises a layer of PET 12, which may have a thickness of about 23-50 ⁇ .
  • the layer 12 has applied thereon a metallized layer 13, which may e.g. consist of aluminium.
  • the lid has applied thereon a COEX coating 4, which is the layer which is to bind to the package so that the lid closes and seals the package, also when it is heat treated.
  • the layer 14 consists of two layers 15 and 16, which are co-extruded on the metallized layer 13, said layer 15 being an acid polymer, and said layer 16 being a polymer selected so as to be capable of binding to the package for which the layer is to be used.
  • the COEX coating may be applied with a thickness of about 10-25 g/m 2 .
  • FIG 3 shows a structure of a lid 20 according to the invention, where the COEX coating 24 comprises 3 layers.
  • the lid 20 comprises a PET layer 22 of about 36 ⁇ , on which a metallized layer 23, preferably consisting of aluminium, is applied.
  • the metallized layer 23 is in contact with the COEX coating 24, which comprises the three layers 25, 26, 27.
  • the layer 25 is an acid polymer with a melt index of about 13, while the intermediate layer 26 has a melt index of about 8, and the lowermost layer 27 has a melt index of about 4.
  • the lowermost layer 27 may consist of a PE, and will be the layer by which the lid 20 is welded to the package.
  • the layers 25 and 27 would have difficulty in being in direct contact with each other because of the great difference in melt index for the layer 25 and the layer 27, respectively.
  • the difference in melt index will mean that it will be very difficult or impossible to achieve homogenous layers with an even layer thickness in the COEX coating.
  • the intermediate layer 26 with a melt index which is between the melt index of the layers 25 and 27, makes it possible to apply a co-extruded coating with homogeneous layers with an even layer thickness.
  • the polymer is selected so as to be compatible with the material in the package on which the lid is to be welded.
  • suitable polymers for the lowermost layer in the lid in connection with packages of specific materials are stated below. A skilled person will readily be able to teach other suitable materials for use in connection with specific package materials.
  • the polymer in the lowermost layer may e.g. be PP or PE (polyethylene).
  • the polymer in the lowermost layer may e.g. be PET.
  • the polymer in the lowermost layer may e.g. en LDPE (low density polyethylene).
  • the polymer in the lowermost layer may e.g. be LDPE or HDPE.

Abstract

La présente invention concerne un opercule prévu pour être soudé sur un emballage et le fermer, de préférence un emballage jetable réalisé en matériau polymère, lequel opercule comprend une feuille en PET d'une épaisseur comprise entre 23 et 50 μ, sur un côté de laquelle est appliquée une couche métallisée, ladite couche métallisée étant recouverte d'un revêtement COEX appliqué suivant une quantité comprise entre environ 10 et environ 25 g/m2, lequel revêtement COEX contient un polymère qui est sélectionné de manière à être compatible avec le matériau polymère de l'emballage.
EP14705698.0A 2013-01-31 2014-01-21 Opercule soudable pour la pasteurisation Withdrawn EP2951015A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201300062 2013-01-31
PCT/DK2014/000005 WO2014117776A1 (fr) 2013-01-31 2014-01-21 Opercule soudable pour la pasteurisation

Publications (1)

Publication Number Publication Date
EP2951015A1 true EP2951015A1 (fr) 2015-12-09

Family

ID=50151063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14705698.0A Withdrawn EP2951015A1 (fr) 2013-01-31 2014-01-21 Opercule soudable pour la pasteurisation

Country Status (2)

Country Link
EP (1) EP2951015A1 (fr)
WO (1) WO2014117776A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3227113A1 (fr) * 2014-12-02 2017-10-11 Danapak Flexibles A/S Feuille formant couvercle, procédé de fabrication, et emballage
EP2853389A1 (fr) * 2014-12-02 2015-04-01 Danapak Flexibles A/S Feuille de couvercle, procédé de fabrication et emballage
EP3630482A1 (fr) * 2017-05-24 2020-04-08 Danapak Flexibles A/S Procédé de fabrication de stratifiés de feuille destinés à être pré-poinçonnés sur un couvercle de feuille destiné à être fixé à un récipient
WO2019081496A1 (fr) 2017-10-24 2019-05-02 Danapak Flexibles A/S Stratifié en feuille, emballage-coque et procédé de fabrication

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118459A4 (fr) * 1998-07-24 2008-03-12 Japan Polyolefins Co Ltd Lamine impermeable au gaz, procede de production de ce lamine et conteneur en papier produit avec ce lamine
EP1146100B1 (fr) * 2000-03-30 2004-08-04 Atofina Emballage comprenant une couche de liant indélaminable sur substrat métallisé et pelable sur substrat polypropylénique
EP2100729A1 (fr) 2008-03-13 2009-09-16 Alcan Technology & Management Ltd. Film multicouche pour le conditionnement à traitement thermique
KR101260306B1 (ko) * 2010-10-14 2013-05-03 주식회사 케이씨씨 가스 차단성이 우수한 진공단열재용 다층형 슈퍼 배리어 봉지 부재
EP2637861B1 (fr) * 2010-11-11 2020-07-01 Danapak Flexibles A/S Complexe à utiliser dans les emballages, méthode de fabrication d'un complexe refermable et utilisation de celui-ci

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014117776A1 *

Also Published As

Publication number Publication date
WO2014117776A1 (fr) 2014-08-07

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