EP0978460B1 - Laminated packaging film and reclosable package fitted with same - Google Patents

Laminated packaging film and reclosable package fitted with same Download PDF

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Publication number
EP0978460B1
EP0978460B1 EP99401842A EP99401842A EP0978460B1 EP 0978460 B1 EP0978460 B1 EP 0978460B1 EP 99401842 A EP99401842 A EP 99401842A EP 99401842 A EP99401842 A EP 99401842A EP 0978460 B1 EP0978460 B1 EP 0978460B1
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EP
European Patent Office
Prior art keywords
film
permanent adhesive
coat
packing sheet
stratified
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
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EP99401842A
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German (de)
French (fr)
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EP0978460A1 (en
EP0978460B2 (en
Inventor
Jacques Hauchecorne
Michel Paul Louis Wemaere
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 France SAS
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Amcor Flexibles France SAS
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Application filed by Amcor Flexibles France SAS filed Critical Amcor Flexibles France SAS
Priority to EP04014338A priority Critical patent/EP1491459A1/en
Publication of EP0978460A1 publication Critical patent/EP0978460A1/en
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Publication of EP0978460B1 publication Critical patent/EP0978460B1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10—Container closures formed after filling
    • B65D2577/20—Container closures formed after filling by applying separate lids or covers
    • B65D2577/2025—Multi-layered container, e.g. laminated, coated

Definitions

  • the present invention relates to a laminated packaging sheet of type comprising a support film associated with a weldable film between which is interposed, at least in marked areas, a layer of an adhesive permanent, linked to the support film and to the weldable film according to two interfaces linkages, formed on either side of the intermediate portion of the layer of permanent adhesive.
  • Packagings comprising a packing sheet allowing a easy opening and resealing are currently used for example for packaging food products.
  • the structure of such leaves is described in particular in the French patent application FR-A-95-14117.
  • the laminated sheet used to allow the opening and the reclosing of the package comprises two polymer films between which a layer of a permanent adhesive is interposed.
  • film solder One of the films, called “film solder” is intended to be directed towards inside the packaging. It is adapted to be welded on the peripheral edge a tray.
  • support film The other film, called “support film”, is intended to form the outer side of the package.
  • Leaf packaging has a structure such that the welded bead of the welding film is separates from the permanent adhesive layer which remains totally attached to the support film. After clearing the sheet, the welded bead is devoid of of permanent adhesive, which is only worn on the support film.
  • the adhesive permanent When replacing the sheet on the tray, the adhesive permanent is reapplied on the welded bead on the tray, in order to restore a bonding connection interface between the welded bead and the permanent adhesive.
  • EP-0.554.152 discloses a packaging sheet according to the preamble of claim 1, wherein one of the link interfaces of the permanent adhesive layer has a resistance lower than the force adhesion of the sheet to the peripheral rim of a container.
  • the purpose of the invention is to propose a packaging sheet after an initial opening, an easy and reliable refitting of it to seal the package.
  • the subject of the invention is a laminated packaging sheet according to claim 1.
  • the packaging sheet has the features of one or more of the dependent claims.
  • the invention furthermore relates to a package comprising a wall external delimiting a housing provided with a passage of access to said lodge. characterized in that said passage is closed by a laminated sheet according to any one of the preceding claims, which sheet is soldered on said outer wall at the periphery of said passage, according to its weldable film in a marked area of the sheet which is provided with adhesive permanent.
  • the package 10 shown in Figure 1 consists of a container rectangular 12 and a flexible cover 14 shutting a passage access 15 inside the tray.
  • the tray 12 consists of a support layer 16 of material suitable, for example polyvinyl chloride, covered on its surface inner of a weldable film 18, for example polyethylene.
  • the tray defines a receptacle 20 bordered around its entire circumference. flange 22 delimiting a flat surface for welding the flexible cover 14 following a straight weld 23.
  • the lid 14 consists essentially of a support film 24 and a weldable film 26 with a layer of permanent adhesive 28 interposed in flat between them all over the surface.
  • a transparent film 30 bearing prints 32 is secured to the support film 24 through a layer of adhesive 34 applied to its printed side.
  • the permanent adhesive layer 28, bonded to the support film 24, defines a first link interface 36.
  • the layer 28 is further linked to the film welding 26 by a second link interface noted 38.
  • the interfaces of link 36, 38 are provided on both sides of the thickness of the layer of permanent adhesive.
  • the intermediate part of the permanent adhesive layer defined between bonding interfaces still called the core of the adhesive layer, do not is not modified by gluing, unlike the boundary layers the link interfaces.
  • the intermediate part of layer 28 is therefore formed only of permanent adhesive that has not undergone any transformation physicochemical.
  • the tensile strength perpendicular to the joint plane of each of the two connecting interfaces 36, 38 is greater the tensile strength of the core of the permanent adhesive layer 28.
  • the force adhesion of the permanent adhesive layer 28, on the one hand to the support film 24 and on the other hand to the welding film 26, according to the connection interfaces 36 and 38, is greater than the cohesive force of the permanent adhesive layer 28 in the heart of it.
  • These surface treatments include, for example, a treatment mechanics, the application of a layer of primary adhesive coating, or Corona treatment. Different types of treatment will be described in more detail in the following description.
  • the material forming the welding film 26 is chosen so that it presents tear resistance lower than the tensile strength the core of the permanent adhesive layer 28.
  • the longitudinal weld 23 is obtained by heat sealing. During the weldable films 18 and 26 melt together, making it possible to obtain after cooling a very reliable weld. In particular, resistance to the traction of the weld 23 is greater than the tear resistance of the weldable film 26, to the tensile strength of the interfaces 36 and 38, and than the tensile strength of the core of the adhesive layer 28.
  • the various layers and films of the operculum 14 have the following features.
  • the support film 24 is a polyethylene film of 36 microns thick.
  • the welding film 26 is a polyethylene film made from "Escorene" resin with a thickness of 40 microns adapted to be bound by heat sealing to the film 18 to form the longitudinal weld 23.
  • the permanent adhesive layer 28 is made by coating using an adhesive mass initially in solution, especially in dispersion aqueous.
  • the permanent adhesive layer can still be applied hot, especially by extrusion.
  • a permanent adhesive commonly referred to as “hot melt” is ideal for this application. It is possible in particular to use PLASTOFLEX 8718 marketed by PARAMELT in Holland.
  • the thickness of the adhesive layer 28 is advantageously included between 10 and 30 microns and in particular equal to about 20 microns.
  • the transparent film 30 is for example a polyethylene film coated of a thickness of 12 microns.
  • This film may have characteristics functional characteristics, in particular sealing characteristics with regard to certain gases. For this purpose, it is processed according to known techniques adapted.
  • the adhesive used to ensure the connection between the film 30 and the support film 24 is of any type adapted to the nature of the films to be connected.
  • a primary coating adhesion is applied on both sides with regard to films 24 and 26 before introduction of the permanent adhesive layer 28.
  • This coating adhesion primer is for example based on polyurethane.
  • the coating marketed in France by BASF under the trade name SOP 815 is suitable for this application.
  • the primary coating of adhesion is replaced at interfaces 36 and 38 by embossing or embossing by calendering the faces next to the films 24 and 26.
  • the faces facing the films 24 and 26 are initially subjected to a treatment aimed at increasing its surface tension.
  • This treatment is advantageously a treatment with Corona effect.
  • This is advantageously carried out on the support film 24 so as to obtain a surface tension of between 45 and 48 dynes / cm.
  • the Corona treatment is advantageously carried out on the face of the welding film 26 to obtain a surface tension of between 44 and 46 dynes / cm.
  • the force to be applied to obtain the separation of the adhesive and one or the other of films 24 and 26 respectively following the interfaces 36 and 38 is 12 N, while the force to be applied to break the adhesive in the core of layer 28 is only 7 N to 9 N.
  • the force to apply to get the tear initial of the weldable film 26 is about 20 to 25 N.
  • the force to pursue the tearing of the film and cause the simultaneous breaking of the adhesive at heart of layer 28 is 12 to 15 N.
  • the force to break the solder 23 is about 40 N.
  • the welding film 26 breaks on both sides of the welded zone.
  • the lid 14 is separated from the tray 12, according to at least part of the length of the flange 22. Only one strip, resulting from the welding film 26, remains welded on the flange 22. It forms a welded bead noted 40.
  • the tensile strength of the interfaces 36 and 38 is greater the tensile strength of the core of the permanent adhesive layer 28, it breaks in its intermediate part and notably substantially in its middle part.
  • a part, denoted 42, of the layer permanent adhesive remains on the welded bead 40, while the complementary, noted 44, remains on the support film 24.
  • the two parts 42, 44 each have a thickness substantially equal to the half of the total thickness of the layer 28. Their thickness is therefore included between 5 and 15 microns depending on the thickness of the adhesive layer.
  • the two parts of the adhesive layer 28 are brought into contact with each other in a Unmodified region of the layer since, away from the link interfaces 36 and 38.
  • the connection between the lid 14 and the tray 12 is reestablished directly to the core of the adhesive layer, which improves performance of the new link.
  • the laminated sheet comprises a layer of permanent adhesive only in regions intended to be welded on the edge of the tray.
  • the support film and the weldable film are bonded to one another by a layer of glue of any suitable type.

Abstract

The multi-layer packaging sheet (14), especially for foodstuffs, has a carrier film (24) together with a welding film (26) and a permanent adhesive layer (28) between them to form bonds (36, 38) at their surfaces. The resistance to a vertical pull action at the bonds is greater than the resistance to a pulling force on the adhesive layer zones between the bonds.

Description

La présente invention concerne une feuille d'emballage stratifiée du type comprenant un film support associé à un film soudable entre lesquels est interposée, au moins en des zones repérées, une couche d'un adhésif permanent, liée au film support et au film soudable suivant deux interfaces de liaison, formées de part et d'autre de la partie intermédiaire de la couche d'adhésif permanent.The present invention relates to a laminated packaging sheet of type comprising a support film associated with a weldable film between which is interposed, at least in marked areas, a layer of an adhesive permanent, linked to the support film and to the weldable film according to two interfaces linkages, formed on either side of the intermediate portion of the layer of permanent adhesive.

Elle concerne en outre un emballage comportant une telle feuille.It also relates to a package comprising such a sheet.

Les emballages comportant une feuille d'emballage permettant une ouverture facile et une refermeture sont actuellement utilisés par exemple pour conditionner des produits alimentaires. La structure de telles feuilles est décrite notamment dans la demande de brevet français FR-A-95-14117.Packagings comprising a packing sheet allowing a easy opening and resealing are currently used for example for packaging food products. The structure of such leaves is described in particular in the French patent application FR-A-95-14117.

Dans ce document, la feuille stratifiée utilisée pour permettre l'ouverture et la refermeture de l'emballage comporte deux films de polymère entre lesquels une couche d'un adhésif permanent est interposée.In this document, the laminated sheet used to allow the opening and the reclosing of the package comprises two polymer films between which a layer of a permanent adhesive is interposed.

L'un des films, dit «film soudant» est destiné à être orienté vers l'intérieur de l'emballage. Il est adapté pour être soudé sur le rebord périphérique d'une barquette. L'autre film, dit «film support», est destiné à former la face externe de l'emballage.One of the films, called "film solder" is intended to be directed towards inside the packaging. It is adapted to be welded on the peripheral edge a tray. The other film, called "support film", is intended to form the outer side of the package.

Dans ce document, lors de l'ouverture de la barquette, le film soudant se déchire de part et d'autre de la région soudée. Il forme ainsi sur le pourtour de la barquette un cordon soudé résiduel du film soudant. La feuille d'emballage a une structure telle que le cordon soudé du film soudant se sépare de la couche d'adhésif permanent qui reste totalement solidaire du film support. Après dégagement de la feuille, le cordon soudé est dépourvu d'adhésif permanent, lequel est porté uniquement sur le film support.In this document, when opening the tray, the film solder tears on both sides of the welded region. It thus forms on the periphery of the tray a residual welded bead of the welding film. Leaf packaging has a structure such that the welded bead of the welding film is separates from the permanent adhesive layer which remains totally attached to the support film. After clearing the sheet, the welded bead is devoid of of permanent adhesive, which is only worn on the support film.

Lors de la remise en place de la feuille sur la barquette, l'adhésif permanent est réappliqué sur le cordon soudé sur la barquette, afin de reconstituer une interface de liaison par collage entre le cordon soudé et l'adhésif permanent.When replacing the sheet on the tray, the adhesive permanent is reapplied on the welded bead on the tray, in order to restore a bonding connection interface between the welded bead and the permanent adhesive.

Malgré les propriétés de collage permanent de l'adhésif, le recollage de la feuille sur la barquette est parfois difficile. Ainsi, il est souvent nécessaire d'appliquer une forte pression pour assurer une nouvelle liaison entre le cordon soudé résiduel porté par la barquette et l'adhésif permanent. Despite the permanent bonding properties of the adhesive, the bonding of the leaf on the tray is sometimes difficult. So, it is often necessary to apply strong pressure to ensure a new link between the residual welded bead carried by the tray and the permanent adhesive.

EP-0.554.152 décrit une feuille d'emballage selon le préambule de la revendication 1, dans laquelle l'une des interfaces de liaison de la couche d'adhésif permanent a une résistance inférieure à la force d'adhérence de la feuille sur le rebord périphérique d'un récipient.EP-0.554.152 discloses a packaging sheet according to the preamble of claim 1, wherein one of the link interfaces of the permanent adhesive layer has a resistance lower than the force adhesion of the sheet to the peripheral rim of a container.

L'invention a pour but de proposer une feuille d'emballage permettant, après une ouverture initiale, une remise en place aisée et fiable de celle-ci pour obturer l'emballage.The purpose of the invention is to propose a packaging sheet after an initial opening, an easy and reliable refitting of it to seal the package.

A cet effet, l'invention a pour objet une feuille d'emballage stratifiée selon la revendication 1.For this purpose, the subject of the invention is a laminated packaging sheet according to claim 1.

Suivant des modes particuliers de réalisation, la feuille d'emballage comporte les caractéristiques de l'une ou plusieurs des revendications dépendantes.According to particular embodiments, the packaging sheet has the features of one or more of the dependent claims.

L'invention a en outre pour objet un emballage comportant une paroi externe délimitant un logement pourvu d'un passage d'accès audit loge.ment, caractérisé en ce que ledit passage est obturé par une feuille stratifiée selon l'une quelconque des revendications précédentes, laquelle feuille est soudée sur ladite paroi externe à la périphérie dudit passage, suivant son film soudable dans une zone repérée de la feuille qui est pourvue d'adhésif permanent. The invention furthermore relates to a package comprising a wall external delimiting a housing provided with a passage of access to said lodge. characterized in that said passage is closed by a laminated sheet according to any one of the preceding claims, which sheet is soldered on said outer wall at the periphery of said passage, according to its weldable film in a marked area of the sheet which is provided with adhesive permanent.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins, sur lesquels :

  • La figure 1 est une vue partielle en perspective et en coupe d'une barquette d'emballage dont le passage d'accès est obturé par une feuille stratifiée selon l'invention, et
  • La figure 2 est une vue analogue à celle de la figure 1, après ouverture de l'emballage.
The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the drawings, in which:
  • FIG. 1 is a partial perspective sectional view of a packaging tray whose access passage is closed by a laminated sheet according to the invention, and
  • Figure 2 is a view similar to that of Figure 1, after opening the package.

L'emballage 10 représenté sur la figure 1 est constitué d'une barquette rectangulaire 12 et d'un opercule souple 14 d'obturation d'un passage d'accès 15 à l'intérieur de la barquette.The package 10 shown in Figure 1 consists of a container rectangular 12 and a flexible cover 14 shutting a passage access 15 inside the tray.

La barquette 12 est constituée d'une couche support 16 en matière appropriée, par exemple du chlorure de polyvinyl, recouverte sur sa surface intérieure d'un film soudable 18, par exemple en polyéthylène.The tray 12 consists of a support layer 16 of material suitable, for example polyvinyl chloride, covered on its surface inner of a weldable film 18, for example polyethylene.

La barquette définit un réceptacle 20 bordé sur tout son pourtour d'un rebord 22 délimitant une surface plane de soudage de l'opercule souple 14 suivant une soudure rectiligne 23.The tray defines a receptacle 20 bordered around its entire circumference. flange 22 delimiting a flat surface for welding the flexible cover 14 following a straight weld 23.

L'opercule 14 est constitué essentiellement d'un film support 24 et d'un film soudable 26 avec une couche d'adhésif permanent 28 interposée en à-plat entre eux sur toute la surface.The lid 14 consists essentially of a support film 24 and a weldable film 26 with a layer of permanent adhesive 28 interposed in flat between them all over the surface.

Un film transparent 30 portant des impressions 32 est solidarisé sur le film support 24 par l'intermédiaire d'une couche de colle 34 appliquée sur sa face imprimée.A transparent film 30 bearing prints 32 is secured to the support film 24 through a layer of adhesive 34 applied to its printed side.

La couche d'adhésif permanente 28, liée au film support 24, définit une première interface de liaison 36. La couche 28 est en outre liée au film soudant 26 par une seconde interface de liaison notée 38. Les interfaces de liaison 36, 38 sont prévues de part et d'autre de l'épaisseur de la couche d'adhésif permanent.The permanent adhesive layer 28, bonded to the support film 24, defines a first link interface 36. The layer 28 is further linked to the film welding 26 by a second link interface noted 38. The interfaces of link 36, 38 are provided on both sides of the thickness of the layer of permanent adhesive.

La partie intermédiaire de la couche d'adhésif permanent définie entre les interfaces de liaison, encore appelée coeur de la couche d'adhésif, ne se trouve pas modifiée par le collage, contrairement aux couches limites constituant les interfaces de liaison. La partie intermédiaire de la couche 28 est donc formée uniquement d'adhésif permanent n'ayant pas subi de transformation physico-chimique.The intermediate part of the permanent adhesive layer defined between bonding interfaces, still called the core of the adhesive layer, do not is not modified by gluing, unlike the boundary layers the link interfaces. The intermediate part of layer 28 is therefore formed only of permanent adhesive that has not undergone any transformation physicochemical.

Selon l'invention, la résistance à la traction perpendiculairement au plan de joint de chacune des deux interfaces de liaison 36, 38 est supérieure à la résistance à la traction du coeur de la couche d'adhésif permanent 28.According to the invention, the tensile strength perpendicular to the joint plane of each of the two connecting interfaces 36, 38 is greater the tensile strength of the core of the permanent adhesive layer 28.

En d'autres termes, pour une surface donnée de la feuille, la force d'adhérence de la couche d'adhésif permanent 28, d'une part au film support 24 et d'autre part au film soudant 26, suivant les interfaces de liaison 36 et 38, est supérieure à la force de cohésion de la couche d'adhésif permanent 28 au coeur de celle-ci.In other words, for a given surface of the sheet, the force adhesion of the permanent adhesive layer 28, on the one hand to the support film 24 and on the other hand to the welding film 26, according to the connection interfaces 36 and 38, is greater than the cohesive force of the permanent adhesive layer 28 in the heart of it.

Ces propriétés de résistance relative entre d'une part les interfaces de liaison 36, 38 et d'autre part le coeur de la couche d'adhésif permanent sont obtenues par des traitements de surface effectués sur les faces en regard du film support 24 et du film soudant 26 sur lesquelles est appliquée la couche adhésive 28.These properties of relative resistance between the interfaces link 36, 38 and secondly the core of the permanent adhesive layer are obtained by surface treatments carried out on the faces opposite of the support film 24 and the welding film 26 on which is applied the adhesive layer 28.

Ces traitements de surface comportent par exemple un traitement mécanique, l'application d'une couche d'enduit primaire d'adhésion, ou encore un traitement à effet Corona. Différents types de traitement seront décrits plus en détail dans la suite de la description.These surface treatments include, for example, a treatment mechanics, the application of a layer of primary adhesive coating, or Corona treatment. Different types of treatment will be described in more detail in the following description.

Le matériau formant le film soudant 26 est choisi de sorte qu'il présente une résistance au déchirement inférieure à la résistance à la traction du coeur de la couche d'adhésif permanent 28.The material forming the welding film 26 is chosen so that it presents tear resistance lower than the tensile strength the core of the permanent adhesive layer 28.

La soudure longitudinale 23 est obtenue par thermosoudage. Lors du soudage, les films soudants 18 et 26 fondent ensemble, permettant d'obtenir après refroidissement une soudure très fiable. En particulier, la résistance à la traction de la soudure 23 est supérieure à la résistance au déchirement du film soudable 26, à la résistance à la traction des interfaces 36 et 38, ainsi qu'à la résistance à la traction du coeur de la couche d'adhésif 28.The longitudinal weld 23 is obtained by heat sealing. During the weldable films 18 and 26 melt together, making it possible to obtain after cooling a very reliable weld. In particular, resistance to the traction of the weld 23 is greater than the tear resistance of the weldable film 26, to the tensile strength of the interfaces 36 and 38, and than the tensile strength of the core of the adhesive layer 28.

A titre d'exemple, les différentes couches et films de l'opercule 14 ont les caractéristiques suivantes.For example, the various layers and films of the operculum 14 have the following features.

Le film support 24 est un film de polyéthylène de 36 microns d'épaisseur. Le film soudant 26 est un film de polyéthylène réalisé à partir de résine «Escorène» d'une épaisseur de 40 microns adapté pour être lié par thermosoudage au film 18 pour former la soudure longitudinale 23.The support film 24 is a polyethylene film of 36 microns thick. The welding film 26 is a polyethylene film made from "Escorene" resin with a thickness of 40 microns adapted to be bound by heat sealing to the film 18 to form the longitudinal weld 23.

La couche d'adhésif permanent 28 est réalisée par enduction à l'aide d'une masse adhésive initialement en solution, notamment en dispersion aqueuse.The permanent adhesive layer 28 is made by coating using an adhesive mass initially in solution, especially in dispersion aqueous.

La couche d'adhésif permanent peut encore être appliquée à chaud, notamment par extrusion.The permanent adhesive layer can still be applied hot, especially by extrusion.

Un adhésif permanent désigné couramment sous le nom de « hot melt » convient parfaitement à cette application. Il est possible notamment d'utiliser du PLASTOFLEX 8718 commercialisé par la société PARAMELT en Hollande.A permanent adhesive commonly referred to as "hot melt "is ideal for this application. It is possible in particular to use PLASTOFLEX 8718 marketed by PARAMELT in Holland.

L'épaisseur de la couche adhésive 28 est avantageusement comprise entre 10 et 30 microns et notamment égale à environ 20 microns.The thickness of the adhesive layer 28 is advantageously included between 10 and 30 microns and in particular equal to about 20 microns.

Le film transparent 30 est par exemple un film de polyéthylène enduit d'une épaisseur de 12 microns. Ce film peut présenter des caractéristiques fonctionnelles particulières, notamment des caractéristiques d'étanchéité vis-à-vis de certains gaz. A cet effet, il est traité suivant des techniques connues adaptées.The transparent film 30 is for example a polyethylene film coated of a thickness of 12 microns. This film may have characteristics functional characteristics, in particular sealing characteristics with regard to certain gases. For this purpose, it is processed according to known techniques adapted.

La colle utilisée pour assurer la liaison entre le film 30 et le film support 24 est de tout type adapté en fonction de la nature des films à relier.The adhesive used to ensure the connection between the film 30 and the support film 24 is of any type adapted to the nature of the films to be connected.

Selon un premier mode de réalisation de l'invention, un enduit primaire d'adhésion est appliqué sur les deux faces en regard des films 24 et 26 avant mise en place de la couche d'adhésif permanent 28. Cet enduit primaire d'adhésion est par exemple à base de polyuréthanne. L'enduit commercialisé en France par la société BASF sous le nom commercial SOP 815 convient pour cette application.According to a first embodiment of the invention, a primary coating adhesion is applied on both sides with regard to films 24 and 26 before introduction of the permanent adhesive layer 28. This coating adhesion primer is for example based on polyurethane. The coating marketed in France by BASF under the trade name SOP 815 is suitable for this application.

Suivant une variante de réalisation, l'enduit primaire d'adhésion est remplacé aux interfaces 36 et 38 par un matriçage ou un gauffrage réalisé par calandrage des faces en regard des films 24 et 26.According to an alternative embodiment, the primary coating of adhesion is replaced at interfaces 36 and 38 by embossing or embossing by calendering the faces next to the films 24 and 26.

Suivant encore un autre mode de réalisation, les faces en regard des films 24 et 26 sont soumises initialement à un traitement visant à augmenter sa tension de surface. Ce traitement est avantageusement un traitement à effet Corona. Celui-ci est avantageusement effectué sur le film support 24 de façon à obtenir une tension de surface comprise entre 45 et 48 dynes/cm. Le traitement Corona est avantageusement réalisé sur la face du film soudant 26 afin d'obtenir une tension de surface comprise entre 44 et 46 dynes/cm.According to yet another embodiment, the faces facing the films 24 and 26 are initially subjected to a treatment aimed at increasing its surface tension. This treatment is advantageously a treatment with Corona effect. This is advantageously carried out on the support film 24 so as to obtain a surface tension of between 45 and 48 dynes / cm. The Corona treatment is advantageously carried out on the face of the welding film 26 to obtain a surface tension of between 44 and 46 dynes / cm.

A titre d'exemple, avec un film selon l'invention, pour une largeur de bande de 15 mm, les forces perpendiculaires au plan de joint nécessaires pour la rupture de chacun des éléments de la feuille sont les suivantes.By way of example, with a film according to the invention, for a width of 15 mm band, forces perpendicular to the joint plane required for breaking each of the elements of the sheet are as follows.

La force devant être appliquée pour obtenir la séparation de l'adhésif permanent et de l'un ou l'autre des films 24 et 26 suivant respectivement les interfaces 36 et 38 est de 12 N, alors que la force devant être appliquée pour obtenir la rupture de l'adhésif au coeur de la couche 28 n'est que de 7 N à 9 N.The force to be applied to obtain the separation of the adhesive and one or the other of films 24 and 26 respectively following the interfaces 36 and 38 is 12 N, while the force to be applied to break the adhesive in the core of layer 28 is only 7 N to 9 N.

Pour la même bande, la force à appliquer pour obtenir le déchirement initial du film soudable 26 est d'environ 20 à 25 N. La force pour poursuivre le déchirement du film et provoquer la rupture simultanée de l'adhésif au coeur de la couche 28 est de 12 à 15 N. De plus, la force pour rompre la soudure 23 est d'environ 40 N.For the same band, the force to apply to get the tear initial of the weldable film 26 is about 20 to 25 N. The force to pursue the tearing of the film and cause the simultaneous breaking of the adhesive at heart of layer 28 is 12 to 15 N. Moreover, the force to break the solder 23 is about 40 N.

Comme représenté sur la figure 2, lors d'une traction exercée sur l'opercule 14 pour l'ouverture de l'emballage par soulèvement de l'opercule, le film soudant 26 se rompt de part et d'autre de la zone soudée.As shown in FIG. 2, during a traction exerted on the operculum 14 for opening the package by lifting the lid, the welding film 26 breaks on both sides of the welded zone.

Ainsi, l'opercule 14 est séparé de la barquette 12, suivant au moins une partie de la longueur du rebord 22. Seule une bande, issue du film soudant 26, reste soudée sur le rebord 22. Elle forme un cordon soudé noté 40.Thus, the lid 14 is separated from the tray 12, according to at least part of the length of the flange 22. Only one strip, resulting from the welding film 26, remains welded on the flange 22. It forms a welded bead noted 40.

Puisque la résistance à la traction des interfaces 36 et 38 est supérieure à la résistance à la traction du coeur de la couche d'adhésif permanent 28, celle-ci se rompt dans sa partie intermédiaire et notamment sensiblement dans sa partie médiane. Ainsi, une partie, notée 42, de la couche d'adhésif permanent subsiste sur le cordon soudé 40, alors que la partie complémentaire, notée 44, subsiste sur le film support 24. Les deux parties complémentaires 42, 44 ont chacune une épaisseur sensiblement égale à la moitié de l'épaisseur totale de la couche 28. Leur épaisseur est donc comprise entre 5 et 15 microns suivant l'épaisseur de la couche d'adhésif. Since the tensile strength of the interfaces 36 and 38 is greater the tensile strength of the core of the permanent adhesive layer 28, it breaks in its intermediate part and notably substantially in its middle part. Thus, a part, denoted 42, of the layer permanent adhesive remains on the welded bead 40, while the complementary, noted 44, remains on the support film 24. The two parts 42, 44 each have a thickness substantially equal to the half of the total thickness of the layer 28. Their thickness is therefore included between 5 and 15 microns depending on the thickness of the adhesive layer.

Dans ces conditions, on comprend que la rupture de la couche d'adhésif permanent est obtenue en dehors des couches limites modifiées de celle-ci qui forment les interfaces de liaison. La rupture a donc lieu au coeur de la couche d'adhésif permanent où la structure et la composition de celui-ci ne sont pas altérées par le contact avec les films 24 et 26.Under these conditions, it is understood that the breaking of the layer of permanent adhesive is obtained outside the modified boundary layers of which form the link interfaces. The rupture therefore takes place at core of the permanent adhesive layer where the structure and composition of this one is not altered by the contact with the films 24 and 26.

Ainsi, lors de la remise en place de l'opercule 14, les deux parties de la couche d'adhésif 28 sont remises en contact l'une avec l'autre dans une région non modifiée de la couche puisque, à l'écart des interfaces de liaison 36 et 38. Ainsi, la liaison entre l'opercule 14 et la barquette 12 est rétablie directement au coeur de la couche d'adhésif, ce qui améliore les performances de la nouvelle liaison.Thus, when replacing the operculum 14, the two parts of the adhesive layer 28 are brought into contact with each other in a Unmodified region of the layer since, away from the link interfaces 36 and 38. Thus, the connection between the lid 14 and the tray 12 is reestablished directly to the core of the adhesive layer, which improves performance of the new link.

Il est à noter que, même en cas de dépôt de résidus du produit emballé ou de traces grasses sur l'une des parties apparentes de la couche adhésive rompue, la refermeture est possible puisque la partie opposée garde son pouvoir adhésif. Après refermeture le dépôt est encapsulé au coeur de la couche adhésive.It should be noted that, even in case of deposit of residues of the packaged product or greasy traces on one of the exposed parts of the diaper adhesive broken, the reclosing is possible since the opposite part keep its adhesive power. After reclosing the deposit is encapsulated at heart of the adhesive layer.

En variante non représentée, la feuille stratifiée comporte une couche d'adhésif permanent uniquement dans les régions destinées à être soudées sur le rebord de la barquette. Dans ce cas, le film support et le film soudable sont liés l'un à l'autre par une couche de colle de tout type adapté.In a variant not shown, the laminated sheet comprises a layer of permanent adhesive only in regions intended to be welded on the edge of the tray. In this case, the support film and the weldable film are bonded to one another by a layer of glue of any suitable type.

Claims (16)

  1. Stratified packing sheet (14) of the type comprising a backing film (24) associated with a weldable film (26) between which there is inserted, at least in marked areas, a coat of permanent adhesive (28), connected to the backing film (24) and to the weldable film (26) along two connecting interfaces (36, 38), formed on either side of the intermediate part of the coat of permanent adhesive (28), characterised in that the tensile strength perpendicular to the joining plane of each of the two connecting interfaces (36, 38) is greater than the tensile strength of the intermediate region of the thickness of the coat of permanent adhesive (28) included between the two connecting interfaces (36, 38).
  2. Packing sheet according to Claim 1, characterised in that the coat of permanent adhesive (28) breaks more or less in its centre.
  3. Stratified packing sheet (14) according to Claim 1 or 2, characterised in that the resistance to tearing of the weldable film (26) is less than the tensile strength of the intermediate region of the coat of permanent adhesive (28).
  4. Stratifiied packing sheet (14) according to any one of the above claims, characterised in that, in the region of at least one connecting interface, at least one of the weldable film (26) and of the backing film (24) has, on its face in contact with the coat of permanent adhesive (28), a surface treatment suitable for increasing the tensile strength of the connecting interface or of each connecting interface (36, 38).
  5. Stratified packing sheet (14) according to Claim 4, characterised in that the surface treatment consists of an adhesion primer composition applied to the face of the film in contact with the coat of permanent adhesive (28).
  6. Stratified packing sheet (14) according to Claim 4, characterised in that the surface treatment consists of a mechanical treatment of the face of the film in contact with the coat of permanent adhesive (28).
  7. Stratified packing sheet (14) according to Claim 4, characterised in that the surface treatment consists of a Corona effect treatment.
  8. Stratified packing sheet (14) according to any one of the above claims, characterised in that the thickness of the coat of permanent adhesive (28) is between 10 and 30 microns inclusive and in particular more or less equal to 20 microns.
  9. Stratified packing sheet (14) according to any one of the above claims, characterised in that the backing film (24) and the weldable film (26) are made from the same material.
  10. Stratified packing sheet (14) according to Claim 9, characterised in that the backing film (24) and the weldable film (26) are both a polyethylene film.
  11. Stratified packing sheet (14) according to Claim 10, characterised in that the weldable film (26) is made from "Escorene" resin.
  12. Stratified packing sheet (14) according to any one of the above claims, characterised in that it has an extra film (30) integral with the backing film (24).
  13. Stratified packing sheet (14) according to Claim 12, characterised in that the extra film (30) forms a barrier to certain gases.
  14. Stratified packing sheet (14) according to any one of the above claims, characterised in that the coat of permanent adhesive has, at the connecting interfaces (36, 38), modified limiting connection coats where the tensile strength perpendicular to the joining plane is greater than the tensile strength of the intermediate region of the thickness of the coat of permanent adhesive (28).
  15. Packing sheet according to any one of the above claims, characterised in that the backing film (24) and the weldable film (26) are both a polyethylene film, and in that a coat of an adhesion primer composition is applied between the coat of permanent adhesive (28) and the two opposite faces of the backing film (24) and of the weldable film (26), the adhesion primer composition being adapted to increase the tensile strength of each connecting interface (36, 38).
  16. Packing (10) having an outer wall (16) delineating a housing (20) provided with an access passage (15) to the said housing, characterised in that the said passage (15) is blanked off by a stratified sheet (14) according to any one of the above claims, this sheet being welded to the said outer wall (16) at the periphery of the said passage (15), along its weldable film (26) in a marked area of the sheet which is provided with permanent adhesive (28).
EP99401842A 1998-08-07 1999-07-21 Laminated packaging film and reclosable package fitted with same Expired - Lifetime EP0978460B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04014338A EP1491459A1 (en) 1998-08-07 1999-07-21 Laminated packaging film and reclosable package fitted with same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9810217A FR2782066B1 (en) 1998-08-07 1998-08-07 LAMINATE PACKAGING SHEET AND RECLOSABLE PACKAGE COMPRISING SAME
FR9810217 1998-08-07

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP04014338A Division EP1491459A1 (en) 1998-08-07 1999-07-21 Laminated packaging film and reclosable package fitted with same

Publications (3)

Publication Number Publication Date
EP0978460A1 EP0978460A1 (en) 2000-02-09
EP0978460B1 true EP0978460B1 (en) 2004-09-29
EP0978460B2 EP0978460B2 (en) 2009-07-15

Family

ID=9529535

Family Applications (2)

Application Number Title Priority Date Filing Date
EP04014338A Withdrawn EP1491459A1 (en) 1998-08-07 1999-07-21 Laminated packaging film and reclosable package fitted with same
EP99401842A Expired - Lifetime EP0978460B2 (en) 1998-08-07 1999-07-21 Laminated packaging film and reclosable package fitted with same

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP04014338A Withdrawn EP1491459A1 (en) 1998-08-07 1999-07-21 Laminated packaging film and reclosable package fitted with same

Country Status (7)

Country Link
EP (2) EP1491459A1 (en)
AT (1) ATE277833T1 (en)
DE (2) DE978460T1 (en)
DK (1) DK0978460T4 (en)
ES (1) ES2182737T5 (en)
FR (1) FR2782066B1 (en)
PT (1) PT978460E (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2807015B1 (en) * 2000-03-31 2003-04-25 Danisco Flexible France LAMINATE PACKAGING SHEET AND RECLOSABLE PACKAGE COMPRISING SAME
FR2814152B1 (en) * 2000-09-21 2003-03-28 Danisco Flexible France SHUTTER COVER FOR A CONTAINER ACCESS OPENING AND PACKAGE COMPRISING SAME
FR2817502B1 (en) * 2000-12-06 2003-02-28 Pechiney Emballage Flexible Eu PEELABLE AND RECLOSABLE OPERATING MATERIAL
CA2456787A1 (en) * 2001-08-06 2003-02-20 Henkel Kommanditgesellschaft Auf Aktien Reclosable pack
EP2716439A1 (en) * 2012-10-04 2014-04-09 egeplast international GmbH Object with multilayer exterior

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172854A (en) † 1991-10-16 1992-12-22 Moshe Epstein Reclosable, reusable package
FR2686578A1 (en) † 1992-01-27 1993-07-30 Alsacienne Aluminium CONTAINER, IN PARTICULAR POT OR TRAY, COMPRISING A REFERMETURE OPERATOR PROVIDED WITH A PERMANENT ADHERENT POWERTRATE LAYER.
DE9403710U1 (en) † 1993-03-24 1994-05-26 Bischof & Klein Transparent self-adhesive surface protection film
FR2734243B1 (en) * 1995-05-16 1997-08-08 Alsacienne Aluminium COMPOSITE TAPE WITH RESILIENCE FOR THERMOPLASTIC CONTAINERS WITH PEEL OPENING
EP0830248A1 (en) † 1995-06-07 1998-03-25 PECHINEY RECHERCHE (Groupement d'Intérêt Economique géré par l'ordonnance no. 67-821 du 23 Septembre 1967) Strip for forming peelable reclosable packaging material and package
FR2741605B1 (en) 1995-11-29 1998-01-16 Soplaril Sa SHUTTER STRUCTURE FOR A CONTAINER, CONTAINER PROVIDED WITH SUCH STRUCTURE, AND METHOD FOR SHUTTERING THE CONTAINER
US5993962A (en) * 1996-01-11 1999-11-30 Ato Findley, Inc. Resealable packaging system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
DE978460T1 (en) 2003-05-28
EP1491459A1 (en) 2004-12-29
EP0978460A1 (en) 2000-02-09
FR2782066A1 (en) 2000-02-11
PT978460E (en) 2005-02-28
DK0978460T4 (en) 2009-11-02
ES2182737T5 (en) 2009-10-30
EP0978460B2 (en) 2009-07-15
DE69920597T8 (en) 2005-11-03
DE69920597T2 (en) 2005-02-17
FR2782066B1 (en) 2000-11-03
ATE277833T1 (en) 2004-10-15
DK0978460T3 (en) 2005-01-31
ES2182737T1 (en) 2003-03-16
DE69920597T3 (en) 2009-12-17
ES2182737T3 (en) 2005-04-16
DE69920597D1 (en) 2004-11-04

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