EP0554152B1 - Container having a recloseable membrane provided with a layer of permanent adhesive - Google Patents

Container having a recloseable membrane provided with a layer of permanent adhesive Download PDF

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Publication number
EP0554152B1
EP0554152B1 EP19930400166 EP93400166A EP0554152B1 EP 0554152 B1 EP0554152 B1 EP 0554152B1 EP 19930400166 EP19930400166 EP 19930400166 EP 93400166 A EP93400166 A EP 93400166A EP 0554152 B1 EP0554152 B1 EP 0554152B1
Authority
EP
European Patent Office
Prior art keywords
layer
heat
barrier
acting
peripheral flange
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.)
Expired - Lifetime
Application number
EP19930400166
Other languages
German (de)
French (fr)
Other versions
EP0554152A1 (en
Inventor
Emile Linet
Daniel Joseph Wolfersperger
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.)
Amcor Flexibles Selestat SAS
Original Assignee
Alsacienne DAluminium
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Publication date
Application filed by Alsacienne DAluminium filed Critical Alsacienne DAluminium
Publication of EP0554152A1 publication Critical patent/EP0554152A1/en
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Publication of EP0554152B1 publication Critical patent/EP0554152B1/en
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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
    • 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
    • B65D77/2068—Means for reclosing the cover after its first opening
    • B65D77/2096—Adhesive means
    • 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

Definitions

  • the present invention relates to a container, in particular a pot or a tray, comprising a peripheral rim on which is fixed a cover comprising an upper sub-assembly comprising at least one layer of barrier material, as well as a lower sub-assembly connected by adhesion to the layer of barrier material and comprising a layer of heat-sealable material fixed by heat-seal on the peripheral rim, as well as a layer of varnish with permanent adhesion, interposed between the layer of barrier-forming material and the layer of heat-sealable material.
  • EP-A-0 160 975 describes a container of this type which can be closed when the product which it contains has not been completely withdrawn.
  • the part of the layer of heat-sealable material which is fixed to the peripheral rim of the container remains integral with the latter, while the material with permanent adhesion is exposed locally and can be used later to close the container.
  • the cover is however entirely separable from the container, which has the drawback of causing a multiplication of waste and consequently increasing the pollution problems.
  • the present invention proposes to provide a solution to this problem and, to do this, it relates to a container of the type indicated above, which is characterized in that the layer of varnish is applied against the part of the layer. of barrier material which overhangs the peripheral rim, with the exception of an area in which an adhesive is applied having an adhesive power greater than that of the heat-sealable material vis-à-vis the peripheral rim, in that the material layer heat sealable is applied against the varnish layer and against the of the layer of barrier material which is not covered with varnish or adhesive, and in that the adhesion strength of the heat-sealable material on the peripheral rim is greater than the adhesion strength of the varnish on the material forming a barrier so that when the container is opened, the rupture of the cover at the peripheral rim takes place either between the layer of varnish and the layer of barrier material, or between the layer of varnish and the layer of heat-sealable material, ie in the mass of the varnish.
  • the present invention thus provides a simple and practical solution for effectively closing the containers provided with a lid fixed by heat sealing.
  • the cover remains locally attached to the container after opening, which makes it possible to reduce pollution of the environment by avoiding that the separation into two parts of the packaging leads to an increase in the amount of waste that can be thrown away.
  • the container according to the present invention is characterized in that the barrier material and the material constituting the peripheral rim are made of the same synthetic material, in that the layer of varnish with permanent adhesion is applied against the layer of barrier-forming material, except at a retaining zone which overhangs the peripheral rim, in that the layer of heat-sealable material covers the layer of varnish with permanent adhesion while the barrier-forming material is fixed against the peripheral rim at the level of the retaining zone, and in that the adhesive strength of the heat-sealable material on the peripheral rim is greater than the adhesive strength of the varnish on the barrier material so that when the container is opened, the rupture of the seal at the peripheral rim takes place either between the layer of varnish and the layer of barrier material, or between the layer of varnish and the layer of heat-sealable material, ie in the mass of the varnish.
  • the barrier material entering into the constitution of the upper sub-assembly of the cover is preferably a metallic material, in particular aluminum.
  • Metals and their alloys are indeed an excellent barrier against humidity and air.
  • the barrier material is made of synthetic material, in particular a thermoplastic material.
  • the varnish with permanent adhesive power is preferably constituted by a hot repositionable cold.
  • a hot melt can in particular be based on latex-gum and have a softening point of 85 to 95 ° C and a viscosity at 175 ° C of 680 to 750 mPas. It can for example comprise a composition comprising styrene, an acrylic compound and a rubber, and form a layer having a thickness of approximately 3 to 25 g / m 2 .
  • the heat-sealable material preferably comprises an acrylic vinyl compound, in particular a butylmethacrylate-methylmethacrylate copolymer and a vinyl resin which may itself comprise vinyl acetate, vinyl chloride and maleic acid.
  • the layer of heat-sealable material may have a thickness of approximately 2 to 10 g / m 2 .
  • FIG. 1 shows a container containing a food, medical or other product, capable of being sampled in several installments, this container being intended to be closed and stored in a place preferably refrigerated before each withdrawal of product.
  • the container shown in FIG. 1 comprises, in a manner known per se, a peripheral rim 1 surrounding the entrance to its cavity and is closed in leaktight manner by a cover 2 fixed by heat-sealing on its peripheral rim. It is preferably made of plastic, but it could be made of metal provided that the upper face of its peripheral rim 1 is coated with a film of synthetic material allowing the heat sealing of its cover 2.
  • the cover 2 comprises an upper sub-assembly I comprising a layer of barrier material 3, and a sub-assembly II connected by adhesion to the layer 3 and comprising a layer of heat-sealable material 4 fixed by heat-seal on the peripheral rim 1, as well as a layer of varnish with permanent adhesion 6 which is interposed between the layer of barrier material 3 and the layer of heat-sealable material 4.
  • Layer 3 of the subassembly I is made of a metallic material, for example aluminum, but it could be made of a synthetic material, for example thermoplastic. It is reinforced by an outer layer 5 fixed on its upper face, this outer layer can be made of synthetic material or paper.
  • the layer of varnish 6 completely covers the underside of the layer of barrier material 3 and is itself entirely covered by the layer of heat-sealable material 4.
  • the layer of varnish 6 covers the part of the layer of barrier material 3 which overhangs the peripheral rim 1, with the exception of a zone 7 in which is applied an adhesive having a power greater adhesion than that of the heat-sealable material vis-à-vis the peripheral rim, making it very difficult to separate the two parts of the packaging.
  • the layer of heat-sealable material 4 it is applied against the layer of varnish 6 and against the part of the layer of barrier material 3 which overhangs the inlet of the container.
  • the adhesive applied in the area 7 visible in FIGS. 2 and 3 is intended to prevent the seal 2 from being able to be completely detached from the container when the latter is opened and thus to prevent multiplication of waste likely to be dispersed in nature and pollute the environment.
  • the adhesive strength of the heat-sealable material on the peripheral rim 1 of the container is greater than the adhesive force of the varnish on the barrier material so that, when the container is opened, the seal 2 breaks at the peripheral rim 1 occurs either between the layer of varnish 6 and the layer of barrier material 3, or in the mass of the varnish, or between the layer of varnish 6 and the layer of heat-sealable material 4.
  • the layer of varnish 6 is applied against the layer of barrier material 3, except at the level of a retaining zone 7a which corresponds to the zone 7 visible in FIGS. 2 and 3. Furthermore, the layer of heat-sealable material 4 covers the layer of varnish 6 while the barrier-forming material is fixed against the peripheral rim 1 at the level of the retaining zone 7a.
  • these materials can for example be polystyrene, polypropylene or polyethylene.
  • the varnish is a hot repositionable cold. It is preferably a latex-gum hot melt having a softening point of 85 to 95 ° C and a viscosity at 175 ° C of 680 to 750 mPas.
  • This hot melt can for example comprise a composition comprising styrene, an acrylic compound and a rubber. It is preferably made up of the product LUNAMELT PS 3406 sold by the company H.B. FULLER.
  • the heat-sealable material its nature depends on that of the container to be sealed.
  • the heat-sealable material will preferably be an acrylic vinyl compound comprising a butylmethacrylate-methylmethacrylate copolymer (for example PLEXIGUM P 24 from R ⁇ HM, D-6100 Darmstadt) and a vinyl resin itself comprising a vinyl acetate, a vinyl chloride and a maleic acid (for example from VMCH of UNION CARBIDE EUROPE SA, B-2030 Antwerp).
  • the proportions by weight of the copolymer and of the resin in the acrylovinyl compound can vary in the ratio from 10/1 to 4/1.
  • the container to be sealed is polypropylene, it is advisable to use as an heat-sealable material an organic acrylic dispersion (for example PLEXISOL PM 555 from R ⁇ HM, D-6100 Darmstadt) which also allows good sealing on polystyrene, polychloride vinyl and polyester.
  • organic acrylic dispersion for example PLEXISOL PM 555 from R ⁇ HM, D-6100 Darmstadt
  • the layer of varnish 6 may have a thickness of approximately 3 to 25 g / m 2 and that the layer of heat-sealable material 4 may have a thickness of approximately 2 to 10 g / m 2 .
  • the cover 2 is grasped at its periphery and one exercises on him a pull up. The cover is then torn directly below the peripheral rim 1 of the container, exposing the varnish with permanent adhesion.
  • the cover 2 can be completely separated from the container.
  • the cover 2 in the embodiments in accordance with the invention, which are represented respectively in FIGS. 2, 3 and in FIG. 4, the cover 2 can remain integral with the container at the level of zones 7 and 7a, the adhesive and the barrier material which are in these zones providing sufficient resistance to encourage the user not to continue its tearing effect.
  • the cover 2 can advantageously be provided with a tongue (not shown in the drawings) in order to facilitate its gripping with a view to its tearing.
  • the layer of varnish 6 and the layer of heat-sealable material 4 of the cover of the container according to FIG. 1 are preferably deposited by coating, as are the layers of varnish 6, the layers of heat-sealable material 4 of the covers. containers according to FIGS. 2 to 4 and the adhesive located in zone 7 of the lid of the container according to FIGS. 2 and 3.
  • the peeling forces to be exerted to open the container initially are of the order of 0.3 to 0.9 dN / 15 min, the peeling forces to be exerted after reclosing being in the order of 0 , 1 to 0.3 dN / 15 min.

Description

La présente invention concerne un récipient, notamment un pot ou une barquette, comportant un rebord périphérique sur lequel est fixé un opercule comprenant un sous-ensemble supérieur comportant au moins une couche de matériau formant barrière, ainsi qu'un sous-ensemble inférieur relié par adhérence à la couche de matériau formant barrière et comportant une couche de matériau thermoscellable fixée par thermoscellage sur le rebord périphérique, ainsi qu'une couche de vernis à pouvoir adhérent permanent, interposée entre la couche de matériau formant barrière et la couche de matériau thermoscellable.The present invention relates to a container, in particular a pot or a tray, comprising a peripheral rim on which is fixed a cover comprising an upper sub-assembly comprising at least one layer of barrier material, as well as a lower sub-assembly connected by adhesion to the layer of barrier material and comprising a layer of heat-sealable material fixed by heat-seal on the peripheral rim, as well as a layer of varnish with permanent adhesion, interposed between the layer of barrier-forming material and the layer of heat-sealable material.

EP-A-0 160 975 décrit un récipient de ce type qui peut être refermé lorsque le produit qu'il renferme n'a pas été entièrement prélevé.EP-A-0 160 975 describes a container of this type which can be closed when the product which it contains has not been completely withdrawn.

En effet, lors de l'enlèvement de l'opercule, la partie de la couche de matériau thermoscellable qui est fixée sur le rebord périphérique du récipient reste solidaire de ce dernier, alors que le matériau à pouvoir adhérent permanent est mis localement à découvert et peut être utilisé ultérieurement pour refermer le récipient.In fact, during the removal of the cover, the part of the layer of heat-sealable material which is fixed to the peripheral rim of the container remains integral with the latter, while the material with permanent adhesion is exposed locally and can be used later to close the container.

L'opercule est toutefois entièrement séparable du récipient, ce qui a l'inconvénient d'entraîner une multiplication des déchets et d'augmenter par conséquent les problèmes de pollution.The cover is however entirely separable from the container, which has the drawback of causing a multiplication of waste and consequently increasing the pollution problems.

La présente invention se propose d'apporter une solution à ce problème et, pour ce faire, elle a pour objet un récipient du type indiqué ci-dessus, qui se caractérise en ce que la couche de vernis est appliquée contre la partie de la couche de matériau formant barrière qui surplombe le rebord périphérique, à l'exception d'une zone dans laquelle est appliqué un adhésif ayant un pouvoir adhérent supérieur à celui du matériau thermoscellable vis-à-vis du rebord périphérique, en ce que la couche de matériau thermoscellable est appliquée contre la couche de vernis et contre la partie de la couche de matériau formant barrière qui n'est recouverte ni de vernis, ni d'adhésif, et en ce que la force d'adhérence du matériau thermoscellable sur le rebord périphérique est supérieure à la force d'adhérence du vernis sur le matériau formant barrière de sorte que lors de l'ouverture du récipient, la rupture de l'opercule au niveau du rebord périphérique a lieu soit entre la couche de vernis et la couche de matériau formant barrière, soit entre la couche de vernis et la couche de matériau thermoscellable, soit dans la masse du vernis.The present invention proposes to provide a solution to this problem and, to do this, it relates to a container of the type indicated above, which is characterized in that the layer of varnish is applied against the part of the layer. of barrier material which overhangs the peripheral rim, with the exception of an area in which an adhesive is applied having an adhesive power greater than that of the heat-sealable material vis-à-vis the peripheral rim, in that the material layer heat sealable is applied against the varnish layer and against the of the layer of barrier material which is not covered with varnish or adhesive, and in that the adhesion strength of the heat-sealable material on the peripheral rim is greater than the adhesion strength of the varnish on the material forming a barrier so that when the container is opened, the rupture of the cover at the peripheral rim takes place either between the layer of varnish and the layer of barrier material, or between the layer of varnish and the layer of heat-sealable material, ie in the mass of the varnish.

Etant donné que le vernis à pouvoir adhérent permanent est mis à découvert après l'ouverture du récipient, il suffit de remettre en place la partie arrachée l'opercule pour que le vernis la retienne fermement et lui permette d'assurer une refermeture convenable du récipient.Since the varnish with permanent adhesion is exposed after the opening of the container, it suffices to put the torn-off part back in place so that the varnish retains it firmly and allows it to ensure proper reclosure of the container .

La présente invention fournit ainsi une solution simple et pratique pour refermer efficacement les récipients pourvus d'un opercule fixé par thermoscellage.The present invention thus provides a simple and practical solution for effectively closing the containers provided with a lid fixed by heat sealing.

Par ailleurs, grâce à l'adhésif qui est interposé entre le rebord du récipient et la couche de matériau formant barrière, l'opercule reste fixé localement au récipient après l'ouverture, ce qui permet de réduire la pollution de l'environnement en évitant que la séparation en deux parties du conditionnement entraîne une multiplication des déchets susceptibles d'être jetés.Furthermore, thanks to the adhesive which is interposed between the rim of the container and the layer of barrier material, the cover remains locally attached to the container after opening, which makes it possible to reduce pollution of the environment by avoiding that the separation into two parts of the packaging leads to an increase in the amount of waste that can be thrown away.

En variante, le récipient selon la présente invention se caractérise en ce que le matériau formant barrière et le matériau constituant le rebord périphérique sont réalisés en une même matière synthétique, en ce que la couche de vernis à pouvoir adhérent permanent est appliquée contre la couche de matériau formant barrière, sauf au niveau d'une zone de retenue qui surplombe le rebord périphérique, en ce que la couche de matériau thermoscellable recouvre la couche de vernis à pouvoir adhérent permanent tandis que le matériau formant barrière est fixé contre le rebord périphérique au niveau de la zone de retenue, et en ce que la force d'adhérence du matériau thermoscellable sur le rebord périphérique est supérieure à la force d'adhérence du vernis sur le matériau formant barrière de sorte que lors de l'ouverture du récipient, la rupture de l'opercule au niveau du rebord périphérique a lieu soit entre la couche de vernis et la couche de matériau formant barrière, soit entre la couche de vernis et la couche de matériau thermoscellable, soit dans la masse du vernis.Alternatively, the container according to the present invention is characterized in that the barrier material and the material constituting the peripheral rim are made of the same synthetic material, in that the layer of varnish with permanent adhesion is applied against the layer of barrier-forming material, except at a retaining zone which overhangs the peripheral rim, in that the layer of heat-sealable material covers the layer of varnish with permanent adhesion while the barrier-forming material is fixed against the peripheral rim at the level of the retaining zone, and in that the adhesive strength of the heat-sealable material on the peripheral rim is greater than the adhesive strength of the varnish on the barrier material so that when the container is opened, the rupture of the seal at the peripheral rim takes place either between the layer of varnish and the layer of barrier material, or between the layer of varnish and the layer of heat-sealable material, ie in the mass of the varnish.

Le matériau formant barrière entrant dans la constitution du sous-ensemble supérieur de l'opercule est de préférence un matériau métallique, notamment de l'aluminium. Les métaux et leurs alliages constituent en effet une excellente barrière vis-à-vis de l'humidité et de l'air. Rien ne s'oppose cependant à ce que le matériau formant barrière soit en matière synthétique, notamment une matière thermoplastique.The barrier material entering into the constitution of the upper sub-assembly of the cover is preferably a metallic material, in particular aluminum. Metals and their alloys are indeed an excellent barrier against humidity and air. However, there is nothing to prevent the barrier material from being made of synthetic material, in particular a thermoplastic material.

Par ailleurs, le vernis à pouvoir adhérent permanent est de préférence constitué par un hot-melt repositionnable à froid. Un tel hot-melt peut notamment être à base de latex-gomme et avoir un point de ramollissement de 85 à 95°C et une viscosité à 175°C de 680 à 750 mPas. Il peut par exemple comprendre une composition comportant du styrène, un composé acrylique et un caoutchouc, et former une couche ayant une épaisseur d'environ 3 à 25 g/m2.Furthermore, the varnish with permanent adhesive power is preferably constituted by a hot repositionable cold. Such a hot melt can in particular be based on latex-gum and have a softening point of 85 to 95 ° C and a viscosity at 175 ° C of 680 to 750 mPas. It can for example comprise a composition comprising styrene, an acrylic compound and a rubber, and form a layer having a thickness of approximately 3 to 25 g / m 2 .

D'autre part, le matériau thermoscellable comprend de préférence un composé acrylo-vinylique, notamment un copolymère butylméthacrylate-méthylméthacrylate et une résine vinylique qui peut elle-même comprendre un acétate de vinyle, un chlorure de vinyle et un acide maléique.On the other hand, the heat-sealable material preferably comprises an acrylic vinyl compound, in particular a butylmethacrylate-methylmethacrylate copolymer and a vinyl resin which may itself comprise vinyl acetate, vinyl chloride and maleic acid.

On précisera en outre ici que la couche de matériau thermoscellable peut avoir une épaisseur d'environ 2 à 10 g/m2.It will further be specified here that the layer of heat-sealable material may have a thickness of approximately 2 to 10 g / m 2 .

Plusieurs modes d'exécution de la présente invention seront décrits ci-après à titre d'exemples nullement limitatifs en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue en coupe schématique et partielle d'un récipient fermé par un opercule conforme à l'état antérieur de la technique ;
  • la figure 2 est une vue en coupe schématique et partielle d'un récipient conforme à l'invention ;
  • la figure 3 est une vue de dessus du récipient visible sur la figure 2 ; et
  • la figure 4 est une vue en coupe schématique et partielle d'un récipient selon un autre mode de réalisation.
Several embodiments of the present invention will be described below by way of non-limiting examples with reference to the accompanying drawings in which:
  • Figure 1 is a schematic and partial sectional view of a container closed with a seal according to the prior art;
  • Figure 2 is a schematic and partial sectional view of a container according to the invention;
  • Figure 3 is a top view of the container visible in Figure 2; and
  • Figure 4 is a schematic and partial sectional view of a container according to another embodiment.

La figure 1 montre un récipient renfermant un produit alimentaire, médical ou autre, susceptible d'être prélevé en plusieurs fois, ce récipient étant destiné à être refermé et conservé dans un endroit de préférence réfrigéré avant chaque prélèvement de produit.FIG. 1 shows a container containing a food, medical or other product, capable of being sampled in several installments, this container being intended to be closed and stored in a place preferably refrigerated before each withdrawal of product.

Le récipient représenté sur la figure 1 comporte d'une manière connue en soi un rebord périphérique 1 entourant l'entrée de sa cavité et est fermé de manière étanche par un opercule 2 fixé par thermoscellage sur son rebord périphérique. Il est de préférence réalisé en matière plastique, mais il pourrait être réalisé en métal à condition que la face supérieure de son rebord périphérique 1 soit revêtue d'un film de matière synthétique autorisant le thermoscellage de son opercule 2.The container shown in FIG. 1 comprises, in a manner known per se, a peripheral rim 1 surrounding the entrance to its cavity and is closed in leaktight manner by a cover 2 fixed by heat-sealing on its peripheral rim. It is preferably made of plastic, but it could be made of metal provided that the upper face of its peripheral rim 1 is coated with a film of synthetic material allowing the heat sealing of its cover 2.

D'une manière générale, l'opercule 2 comprend un sous-ensemble supérieur I comportant une couche de matériau formant barrière 3, et un sous-ensemble II relié par adhérence à la couche 3 et comportant une couche de matériau thermoscellable 4 fixée par thermoscellage sur le rebord périphérique 1, ainsi qu'une couche de vernis à pouvoir adhérent permanent 6 qui est interposée entre la couche de matériau formant barrière 3 et la couche de matière thermoscellable 4.In general, the cover 2 comprises an upper sub-assembly I comprising a layer of barrier material 3, and a sub-assembly II connected by adhesion to the layer 3 and comprising a layer of heat-sealable material 4 fixed by heat-seal on the peripheral rim 1, as well as a layer of varnish with permanent adhesion 6 which is interposed between the layer of barrier material 3 and the layer of heat-sealable material 4.

La couche 3 du sous-ensemble I est réalisée en un matériau métallique, par exemple en aluminium, mais elle pourrait être réalisée en une matière synthétique, par exemple thermoplastique. Elle est renforcée par une couche externe 5 fixée sur sa face supérieure, cette couche externe pouvant être en matière synthétique ou en papier.Layer 3 of the subassembly I is made of a metallic material, for example aluminum, but it could be made of a synthetic material, for example thermoplastic. It is reinforced by an outer layer 5 fixed on its upper face, this outer layer can be made of synthetic material or paper.

Quant à la couche de vernis 6, elle recouvre entièrement la face inférieure de la couche de matériau formant barrière 3 et est elle-même entièrement recouverte par la couche de matériau thermoscellable 4.As for the layer of varnish 6, it completely covers the underside of the layer of barrier material 3 and is itself entirely covered by the layer of heat-sealable material 4.

Dans le mode de réalisation conforme à l'invention, qui est représenté sur les figures 2 et 3, la couche de vernis 6 recouvre la partie de la couche de matériau formant barrière 3 qui surplombe le rebord périphérique 1, à l'exception d'une zone 7 dans laquelle est appliqué un adhésif ayant un pouvoir adhérent supérieur à celui du matériau thermoscellable vis-à-vis du rebord périphérique, rendant très difficile la séparation des deux parties du conditionnement. Quant à la couche de matériau thermoscellable 4, elle est appliquée contre la couche de vernis 6 et contre la partie de la couche de matériau formant barrière 3 qui surplombe l'entrée du récipient.In the embodiment according to the invention, which is shown in Figures 2 and 3, the layer of varnish 6 covers the part of the layer of barrier material 3 which overhangs the peripheral rim 1, with the exception of a zone 7 in which is applied an adhesive having a power greater adhesion than that of the heat-sealable material vis-à-vis the peripheral rim, making it very difficult to separate the two parts of the packaging. As for the layer of heat-sealable material 4, it is applied against the layer of varnish 6 and against the part of the layer of barrier material 3 which overhangs the inlet of the container.

On notera ici que l'adhésif appliqué dans la zone 7 visible sur les figures 2 et 3 a pour but d'éviter que l'opercule 2 puisse être entièrement détaché du récipient lors de l'ouverture de ce dernier et d'empêcher ainsi une multiplication des déchets susceptibles d'être dispersés dans la nature et de polluer l'environnement.It will be noted here that the adhesive applied in the area 7 visible in FIGS. 2 and 3 is intended to prevent the seal 2 from being able to be completely detached from the container when the latter is opened and thus to prevent multiplication of waste likely to be dispersed in nature and pollute the environment.

La force d'adhérence du matériau thermoscellable sur le rebord périphérique 1 du récipient est supérieure à la force d'adhérence du vernis sur le matériau formant barrière afin que, lors de l'ouverture du récipient, la rupture de l'opercule 2 au niveau du rebord périphérique 1 se produise, soit entre la couche de vernis 6 et la couche de matériau formant barrière 3, soit dans la masse du vernis, soit entre la couche de vernis 6 et la couche de matériau thermoscellable 4.The adhesive strength of the heat-sealable material on the peripheral rim 1 of the container is greater than the adhesive force of the varnish on the barrier material so that, when the container is opened, the seal 2 breaks at the peripheral rim 1 occurs either between the layer of varnish 6 and the layer of barrier material 3, or in the mass of the varnish, or between the layer of varnish 6 and the layer of heat-sealable material 4.

Dans le mode de réalisation conforme à l'invention, qui est représenté sur la figure 4, la couche de vernis 6 est appliquée contre la couche de matériau formant barrière 3, sauf au niveau d'une zone de retenue 7a qui correspond à la zone 7 visible sur les figures 2 et 3. Par ailleurs, la couche de matériau thermoscellable 4 recouvre la couche de vernis 6 tandis que le matériau formant barrière est fixé contre le rebord périphérique 1 au niveau de la zone de retenue 7a.In the embodiment according to the invention, which is shown in FIG. 4, the layer of varnish 6 is applied against the layer of barrier material 3, except at the level of a retaining zone 7a which corresponds to the zone 7 visible in FIGS. 2 and 3. Furthermore, the layer of heat-sealable material 4 covers the layer of varnish 6 while the barrier-forming material is fixed against the peripheral rim 1 at the level of the retaining zone 7a.

On notera ici que pour permettre la fixation de l'opercule 2 sur le rebord périphérique 1, il est nécessaire que le matériau formant barrière et le matériau constituant ledit bord périphérique 1 soient les mêmes, ces matériaux pouvant par exemple être du polystyrène, du polypropylène ou du polyéthylène.It will be noted here that to allow the fixing of the cover 2 on the peripheral rim 1, it is necessary that the material forming a barrier and the material constituting said peripheral edge 1 are the same, these materials can for example be polystyrene, polypropylene or polyethylene.

On va maintenant donner des précision sur le vernis et sur le matériau thermoscellable qui peuvent être utilisés pour la mise en oeuvre de la présente invention.We will now give details on the varnish and on the heat-sealable material which can be used for the implementation of the present invention.

Le vernis est un hot-melt repositionnable à froid. Il s'agit de préférence d'un hot-melt à base de latex-gomme ayant un point de ramollissement de 85 à 95°C et une viscosité à 175°C de 680 à 750 mPas. Ce hot-melt peut par exemple comprendre une composition comportant du styrène, un composé acrylique et un caoutchouc. Il est de préférence constitué par le produit LUNAMELT PS 3406 vendu par la société H.B. FULLER.The varnish is a hot repositionable cold. It is preferably a latex-gum hot melt having a softening point of 85 to 95 ° C and a viscosity at 175 ° C of 680 to 750 mPas. This hot melt can for example comprise a composition comprising styrene, an acrylic compound and a rubber. It is preferably made up of the product LUNAMELT PS 3406 sold by the company H.B. FULLER.

Quant au matériau thermoscellable, sa nature est fonction de celle du récipient à operculer. Ainsi, si ce dernier est du polystyrène, du polychlorure de vinyle ou du polyester, le matériau thermoscellable sera de préférence un composé acrylo-vinylique comprenant un copolymère butylméthacrylate-méthylméthacrylate (par exemple du PLEXIGUM P 24 de RÖHM, D-6100 Darmstadt) et une résine vinylique comprenant elle-même un acétate de vinyle, un chlorure de vinyle et un acide maléique (par exemple du VMCH de UNION CARBIDE EUROPE SA, B-2030 Anvers). Les proportions en poids du copolymère et de la résine dans le composé acrylovinylique peuvent varier dans le rapport de 10/1 à 4/1.As for the heat-sealable material, its nature depends on that of the container to be sealed. Thus, if the latter is polystyrene, polyvinyl chloride or polyester, the heat-sealable material will preferably be an acrylic vinyl compound comprising a butylmethacrylate-methylmethacrylate copolymer (for example PLEXIGUM P 24 from RÖHM, D-6100 Darmstadt) and a vinyl resin itself comprising a vinyl acetate, a vinyl chloride and a maleic acid (for example from VMCH of UNION CARBIDE EUROPE SA, B-2030 Antwerp). The proportions by weight of the copolymer and of the resin in the acrylovinyl compound can vary in the ratio from 10/1 to 4/1.

Si le récipient à operculer est un polypropylène, il est conseillé d'utiliser comme matériau thermoscellable une dispersion organique acrylique (par exemple du PLEXISOL PM 555 de RÖHM, D-6100 Darmstadt) qui permet, par ailleurs, un bon scellage sur polystyrène, polychlorure de vinyle et polyester.If the container to be sealed is polypropylene, it is advisable to use as an heat-sealable material an organic acrylic dispersion (for example PLEXISOL PM 555 from RÖHM, D-6100 Darmstadt) which also allows good sealing on polystyrene, polychloride vinyl and polyester.

On précisera par ailleurs que la couche de vernis 6 peut avoir une épaisseur d'environ 3 à 25 g/m2 et que la couche de matériau thermoscellable 4 peut avoir une épaisseur d'environ 2 à 10 g/m2.It will also be specified that the layer of varnish 6 may have a thickness of approximately 3 to 25 g / m 2 and that the layer of heat-sealable material 4 may have a thickness of approximately 2 to 10 g / m 2 .

Pour ouvrir un récipient conforme à l'invention, on saisit l'opercule 2 au niveau de sa périphérie et on exerce sur lui une traction vers le haut. L'opercule se déchire alors à l'aplomb du rebord périphérique 1 du récipient en mettant à découvert le vernis à pouvoir adhérent permanent.To open a container according to the invention, the cover 2 is grasped at its periphery and one exercises on him a pull up. The cover is then torn directly below the peripheral rim 1 of the container, exposing the varnish with permanent adhesion.

Dans le mode de réalisation conforme à l'état antérieur de la technique, qui est représenté sur la figure 1, l'opercule 2 peut être entièrement séparé du récipient. Par contre, dans les modes de réalisation conformes à l'invention, qui sont représentés respectivement sur les figures 2, 3 et sur la figure 4, l'opercule 2 peut rester solidaire du récipient au niveau des zones 7 et 7a, l'adhésif et le matériau formant barrière qui sont dans ces zones opposant une résistance suffisante pour inciter l'utilisateur à ne pas poursuivre son effet d'arrachement.In the embodiment according to the prior art, which is shown in Figure 1, the cover 2 can be completely separated from the container. On the other hand, in the embodiments in accordance with the invention, which are represented respectively in FIGS. 2, 3 and in FIG. 4, the cover 2 can remain integral with the container at the level of zones 7 and 7a, the adhesive and the barrier material which are in these zones providing sufficient resistance to encourage the user not to continue its tearing effect.

Etant donné que le vernis à pouvoir adhérent permanent est à découvert, on conçoit aisément qu'il suffit de remettre en place l'opercule contre le rebord périphérique 1 pour refermer le récipient.Since the varnish with permanent adhesion is uncovered, it is easily understood that it suffices to replace the cover against the peripheral rim 1 to close the container.

Pour être complet, on précisera que l'opercule 2 peut avantageusement être pourvu d'une languette (non représentée sur les dessins) afin de faciliter sa préhension en vue de son arrachement.To be complete, it will be specified that the cover 2 can advantageously be provided with a tongue (not shown in the drawings) in order to facilitate its gripping with a view to its tearing.

On précisera également que la couche de vernis 6 et la couche de matériau thermoscellable 4 de l'opercule du récipient selon la figure 1 sont de préférence déposées par enduction, de même que les couches de vernis 6, les couches de matériau thermoscellable 4 des opercules des récipients selon les figures 2 à 4 et l'adhésif situé dans la zone 7 de l'opercule du récipient selon les figures 2 et 3.It will also be specified that the layer of varnish 6 and the layer of heat-sealable material 4 of the cover of the container according to FIG. 1 are preferably deposited by coating, as are the layers of varnish 6, the layers of heat-sealable material 4 of the covers. containers according to FIGS. 2 to 4 and the adhesive located in zone 7 of the lid of the container according to FIGS. 2 and 3.

On précisera encore que les forces de pelage à exercer pour ouvrir initialement le récipient sont de l'ordre de 0,3 à 0,9 dN/15 mn, les forces de pelage à exercer après refermeture étant quant à elles de l'ordre 0,1 à 0,3 dN/15 mn.It will also be specified that the peeling forces to be exerted to open the container initially are of the order of 0.3 to 0.9 dN / 15 min, the peeling forces to be exerted after reclosing being in the order of 0 , 1 to 0.3 dN / 15 min.

Claims (12)

  1. A container, particularly of a pot or elongated shape, having a peripheral flange (1) on which there is disposed a closure membrane (2) comprising an upper sub-assembly (I) consisting of at least one layer of a material acting as a barrier (3) and a lower sub-assembly (II) adhered to the layer of material acting as a barrier and comprising both a layer of heat-sealing material (4) secured by heat-sealing to the peripheral flange and a layer of permanently adhesive coating material (6) positioned between the barrier-acting layer (3) and the heat-sealing layer (4), characterized in that the coating layer (6) is applied to the portion of the barrier-acting material (3) which exends over the peripheral flange (1), except over an area (7) on which there is applied an adhesive having a higher adhesive power than the heat-sealing material in relation to the peripheral flange, in that the layer of heat-sealing material (4) is applied against the coating layer (6) and against that part of the layer of barrier-acting material (3) which is not coated with coating material or adhesive, and in that the adhesive power of the heat-sealing material on the peripheral flange (1) is higher than the adhesive power of the coating material on the barrier-acting material, such that, on opening the container, rupture of the membrane (2) at the level of the peripheral flange takes place between the layer of coating material (6) and the layer of barrier-acting material (3), between the layer of coating material (6) and the layer of heat-sealing material, and within the mass of coating material.
  2. A container, particularly of a pot or elongated shape, having a peripheral flange (1) on which there is disposed a closure membrane (2) comprising an upper sub-assembly (I) consisting of at least a layer of material acting as a barrier (3) and a lower sub-assembly (II) adhered to the barrier-acting material and comprising both a layer of heat-sealing material (4) secured by heat-sealing to the peripheral flange and a layer of permanently adhesive coating material (6) positioned between the barrier-acting layer (3) and the heat-sealing layer (4), characterised in that the barrier-acting material and the material of which the peripheral flange (1) is made are provided in the same synthetic material, in that the layer of coating material capable of permanent adhesion (6) is applied against the barrier-acting layer (3), except at the level of a retaining area (7a) which extends over the peripheral flange, in that the layer of heat-sealing material (4) covers the layer of permanently adhesive coating material (6) whereas the barrier-acting material is secured to the peripheral flange (1) at the level of the retaining area (7a), in that the power of adhesion of the heat-sealing material on the peripheral flange (1) is higher than the power of adhesion of the coating material on the barrier-acting material, such that, on opening the container, rupture of the closure membrane (2) at the level of the peripheral flange takes place between the layer of coating material (6) and the layer of barrier-acting material (3), between the layer of coating material (6) and the layer of heat-sealing material, and within the mass of the coating material.
  3. A container according to claim 1 or claim 2, characterised in that the barrier-acting material is a metallic material.
  4. A container according to claim 3, characterised in that the metallic material is aluminium.
  5. A container according to claim 1 or claim 2, characterised in that the coating material capable of permanent adhesion is of the hot-melt type which is capable of being repositioned when cold.
  6. A container according to claim 5, characterised in that the heat sealing adhesive is a latex rubber based adhesive, with a melting point of between 85 and 90°C and a viscosity of 680 to 750 mPas at 175°C.
  7. A container according to claim 5 or claim 6, characterized in that the holt-melt adhesive is a mixture comprising styrene, an acrylic compound and rubber.
  8. A container according to any one of claims 1, 2 and 5 to 7, characterised in that the layer of coating material (6) has a thickness of approximately 3 to 25 g/m2.
  9. A container according to claim 1 or claim 2, characterised in that the heat sealing material is an acrylo-vinyl compound.
  10. A container according to claim 9, characterised in that the heat sealing material comprises a butylmethacrylate-methylmethacrylate copolymer and a vinyl resin.
  11. A container according to claim 10, characterised in that the vinyl resin comprises vinyl acetate, vinyl chloride and maleic acid.
  12. A container according to any one of claims 1, 2 and 9 to 11, characterised in that the layer of heat-sealing material (4) has a thickness of approximately 2 to 10 g/m2.
EP19930400166 1992-01-27 1993-01-26 Container having a recloseable membrane provided with a layer of permanent adhesive Expired - Lifetime EP0554152B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9200827 1992-01-27
FR9200827A FR2686578A1 (en) 1992-01-27 1992-01-27 CONTAINER, IN PARTICULAR POT OR TRAY, COMPRISING A REFERMETURE OPERATOR PROVIDED WITH A PERMANENT ADHERENT POWERTRATE LAYER.

Publications (2)

Publication Number Publication Date
EP0554152A1 EP0554152A1 (en) 1993-08-04
EP0554152B1 true EP0554152B1 (en) 1996-07-24

Family

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Application Number Title Priority Date Filing Date
EP19930400166 Expired - Lifetime EP0554152B1 (en) 1992-01-27 1993-01-26 Container having a recloseable membrane provided with a layer of permanent adhesive

Country Status (3)

Country Link
EP (1) EP0554152B1 (en)
DE (1) DE69303732T2 (en)
FR (1) FR2686578A1 (en)

Cited By (4)

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AU696059B2 (en) * 1994-07-04 1998-08-27 Barilla G. E R. F.Lli Societa Per Azioni A label for reclosable packages
US6302290B1 (en) 1995-11-29 2001-10-16 Atofina Container sealing assembly
EP1281623A1 (en) 2001-07-31 2003-02-05 Kraft Foods R&D, Inc. Package, preferably for foodstuffs
EP2154082A1 (en) 2004-12-23 2010-02-17 Wipak Walsrode GmbH & Co. KG Resealable packaging

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IT1265453B1 (en) * 1993-12-28 1996-11-22 Safta Spa COMPOSITE FILM FOR THE RE-CLOSING OF CONTAINERS
FR2738226A1 (en) * 1995-08-29 1997-03-07 Grace Sa Resealable vacuum packaging for food prods.
BE1010387A3 (en) * 1996-06-26 1998-07-07 Techy International Sa Method and material to make a sealable and re-closable lid
ES2236785T3 (en) * 1997-05-29 2005-07-16 Illinois Tool Works Inc. PROFILE CLOSURE TAPE WITH A PELABLE SEALING COAT.
EP0905048A1 (en) * 1997-09-26 1999-03-31 Cryovac, Inc. Composite cover sheet for the re-closure of containers
FR2782066B1 (en) * 1998-08-07 2000-11-03 Danisco Flexible France LAMINATE PACKAGING SHEET AND RECLOSABLE PACKAGE COMPRISING SAME
IT1312549B1 (en) * 1999-04-26 2002-04-22 Mauro Officine Grafiche S P A MULTI-LAYER STRUCTURE FOR CLOSING CONTAINERS, SUITABLE FOR THE ALIGNMENT OF CONTAINERS THAT CAN BE CLOSED SEVERAL TIMES AFTER THE FIRST
SE9902642L (en) * 1999-07-08 2001-01-09 Fredin Sven Inge Materials and ways to form a lid on a package
GB2380180B (en) * 2001-09-28 2005-05-11 Redbridge Holdings Ltd Container
DE102005011500A1 (en) * 2005-03-12 2006-09-21 Henkel Kgaa Resealable packaging
EP2813441A1 (en) 2013-06-11 2014-12-17 Mondi Consumer Packaging Technologies GmbH Film tear-open package and use of a flexible coextrusion film with at least three layers for producing a film tear-open package

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FR2294838A1 (en) * 1974-12-17 1976-07-16 Trentesaux Toulemonde Sa MULTI-LAYER SHEET FOR THE HEAT-SOCKING OF A CONTAINER
US4438850A (en) * 1982-07-15 1984-03-27 Reynolds Metals Company Membrane closure structure
DE3416755A1 (en) * 1984-05-07 1985-11-07 Nyffeler, Corti AG, Kirchberg COLD OR HOT-SEALABLE MULTILAYER FILM FOR RE-SEALABLE PACKAGING
FR2615488B1 (en) * 1987-05-20 1990-05-18 Aluminium Societe Alsacienne LID FOR CLOSING A CONTAINER COMPRISING A SEALING AREA IN THERMOPLASTIC MATERIAL, AND METHOD FOR MANUFACTURING THIS LID
FR2669607B1 (en) * 1990-11-26 1995-05-12 Torterotot FLEXIBLE CLOSABLE SAFETY COVER.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU696059B2 (en) * 1994-07-04 1998-08-27 Barilla G. E R. F.Lli Societa Per Azioni A label for reclosable packages
US6302290B1 (en) 1995-11-29 2001-10-16 Atofina Container sealing assembly
EP1281623A1 (en) 2001-07-31 2003-02-05 Kraft Foods R&D, Inc. Package, preferably for foodstuffs
EP2154082A1 (en) 2004-12-23 2010-02-17 Wipak Walsrode GmbH & Co. KG Resealable packaging

Also Published As

Publication number Publication date
FR2686578B1 (en) 1995-05-05
EP0554152A1 (en) 1993-08-04
FR2686578A1 (en) 1993-07-30
DE69303732D1 (en) 1996-08-29
DE69303732T2 (en) 1997-02-20

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