EP0978460A1 - 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
EP0978460A1
EP0978460A1 EP99401842A EP99401842A EP0978460A1 EP 0978460 A1 EP0978460 A1 EP 0978460A1 EP 99401842 A EP99401842 A EP 99401842A EP 99401842 A EP99401842 A EP 99401842A EP 0978460 A1 EP0978460 A1 EP 0978460A1
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EP
European Patent Office
Prior art keywords
film
layer
permanent adhesive
laminated packaging
adhesive
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.)
Granted
Application number
EP99401842A
Other languages
German (de)
French (fr)
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EP0978460B1 (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
Original Assignee
Danisco Flexible France
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Publication date
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Application filed by Danisco Flexible France filed Critical Danisco Flexible France
Priority to EP04014338A priority Critical patent/EP1491459A1/en
Publication of EP0978460A1 publication Critical patent/EP0978460A1/en
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 the type comprising a support film associated with a weldable film between which is interposed, at least in identified areas, a layer of an adhesive permanent, linked to the support film and to the film weldable at two interfaces of connection, formed on either side of the intermediate part of the layer permanent adhesive.
  • Packages with a packaging sheet allowing easy opening and reclosing are currently used for example for packaging food products.
  • the structure of such leaves is described in particular in French patent application FR-A-95-14117.
  • the laminated sheet used to allow the opening and the reclosure of the packaging comprises two films of polymer between which a layer of permanent adhesive is interposed.
  • welding film is intended to be oriented towards inside the package. It is suitable to be welded to the peripheral rim a tray.
  • the other 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 layer of permanent adhesive which remains completely integral with the support film. After release of the sheet, the welded bead is devoid permanent adhesive, which is worn only on the backing film.
  • the adhesive permanent is reapplied on the welded bead on the tray, in order to reconstitute a bonding interface between the welded bead and permanent adhesive.
  • the object of the invention is to propose a packaging sheet allowing, after an initial opening, an easy and reliable replacement thereof to seal the packaging.
  • the subject of the invention is a laminated packaging sheet of the aforementioned type, characterized in that the tensile strength perpendicularly at the joint plane of each of the two link interfaces is greater the tensile strength of the intermediate region of the thickness of the layer of permanent adhesive between the two bonding interfaces.
  • the invention further relates to a packaging comprising a wall external delimiting a housing provided with an access passage to said housing, characterized in that said passage is closed by a laminated sheet according to any one of the preceding claims, which sheet is welded to said outer wall at the periphery of said passage, according to its film weldable in a marked area of the sheet which is provided with adhesive permanent.
  • the packaging 10 shown in Figure 1 consists of a tray rectangular 12 and a flexible cover 14 for closing a passage access 15 inside the tray.
  • the tray 12 consists of a support layer 16 made of material suitable, for example polyvinyl chloride, covered on its surface interior of a weldable film 18, for example of polyethylene.
  • the tray defines a receptacle 20 bordered around its entire periphery rim 22 delimiting a flat welding surface of the flexible cover 14 following a straight weld 23.
  • the cover 14 consists essentially of a support film 24 and a weldable film 26 with a layer of permanent adhesive 28 interposed flat between them over the entire surface.
  • a transparent film 30 carrying impressions 32 is secured to the support film 24 by means of a layer of adhesive 34 applied to its printed side.
  • the layer of permanent adhesive 28, linked to the support film 24, defines a first bonding interface 36.
  • the layer 28 is also bonded to the film welding 26 by a second link interface denoted 38.
  • the interfaces of connection 36, 38 are provided on either side of the thickness of the layer permanent adhesive.
  • the middle part of the permanent adhesive layer defined between the bonding interfaces also called the core of the adhesive layer, do not not modified by bonding, unlike the boundary layers constituting link interfaces.
  • the middle part of layer 28 is therefore formed only from permanent adhesive which has not undergone any transformation physico-chemical.
  • the tensile strength perpendicular to the joint plane of each of the two link interfaces 36, 38 is greater the tensile strength of the core of the permanent adhesive layer 28.
  • the force of 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, along the connection interfaces 36 and 38, is greater than the cohesive force of the layer of permanent adhesive 28 at the heart of it.
  • These surface treatments include for example a treatment mechanical, applying a layer of primary adhesion plaster, 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 has lower tear strength than tensile strength of the core of the permanent adhesive layer 28.
  • the longitudinal weld 23 is obtained by heat sealing. During the welding, the welding films 18 and 26 melt together, making it possible to obtain after cooling a very reliable weld. In particular, resistance to the tensile strength of the weld 23 is greater than the tear strength of the weldable film 26, tensile strength of interfaces 36 and 38, as well than the tensile strength of the core of the adhesive layer 28.
  • the different layers and films of the cover 14 have the following features.
  • the support film 24 is a 36 micron polyethylene film thick.
  • the welding film 26 is a polyethylene film produced from "Escorene" resin with a thickness of 40 microns adapted to be bonded by heat sealing with film 18 to form the longitudinal weld 23.
  • the layer of permanent adhesive 28 is produced by coating using an adhesive mass initially in solution, especially in dispersion aqueous.
  • the layer of permanent adhesive 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 sold by the company 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 coated polyethylene film with a thickness of 12 microns.
  • This film may have characteristics particular functional features, including sealing characteristics vis-à-vis certain gases. To this end, it is treated 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 according to the nature of the films to be bound.
  • a primary coating of adhesion is applied to the two faces opposite the films 24 and 26 before placing 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 adhesion coating is replaced at interfaces 36 and 38 by a stamping or embossing carried out by calendering the facing faces of films 24 and 26.
  • the facing faces of the films 24 and 26 are initially subjected to treatment aimed at increasing its surface tension.
  • This treatment is advantageously a treatment to 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 in order to obtain a surface tension of between 44 and 46 dynes / cm.
  • the force to be applied to achieve separation of the adhesive permanent and one or other of films 24 and 26 respectively according to interfaces 36 and 38 is 12 N, while the force to be applied to break the adhesive at the heart of layer 28 is only 7 N to 9 N.
  • the welding film 26 breaks on either side of the welded zone.
  • the cover 14 is separated from the tray 12, following at least part of the length of the rim 22. Only one strip, coming from the welding film 26, remains welded to the rim 22. It forms a welded bead noted 40.
  • part, denoted 42 of the layer permanent adhesive remains on the welded bead 40, while the portion additional, noted 44, remains on the support film 24.
  • the two parts complementary 42, 44 each have a thickness substantially equal to the half of the total thickness of 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 back into contact with one another in a unmodified region of the layer since, apart from the binding interfaces 36 and 38.
  • the connection between the cover 14 and the tray 12 is restored directly at the core of the adhesive layer, which improves performance of the new link.
  • the laminated sheet has a layer permanent adhesive only in areas to be welded on the edge of the tray.
  • the support film and the weldable film are linked to each other by a layer of glue of any suitable type.

Abstract

The packaging material (14) consists of a backing film layer (24) and a layer of a weldable film (26) joined, at least in specific zones, by a layer (28) of a permanent adhesive with two communicating interfaces (36, 38) which have a resistance to traction applied perpendicular to the joint which is greater than that of the adhesive between the two interfaces. The resistance of the weldable film layer to tearing is lower than the resistance to traction of the intermediate zone of the adhesive layer, which is preferably 20 microns thick.

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 the type comprising a support film associated with a weldable film between which is interposed, at least in identified areas, a layer of an adhesive permanent, linked to the support film and to the film weldable at two interfaces of connection, formed on either side of the intermediate part of the layer permanent adhesive.

Elle concerne en outre un emballage comportant une telle feuille.It further 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.Packages with a packaging sheet allowing easy opening and reclosing are currently used for example for packaging food products. The structure of such leaves is described in particular in 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 reclosure of the packaging comprises two films of polymer between which a layer of 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 "welding film" is intended to be oriented towards inside the package. It is suitable to be welded to the peripheral rim 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 the tray is opened, the film sealing tears on either side of the welded region. It thus forms around the perimeter from the tray a residual welded bead of the sealing film. Leaf packaging has a structure such that the welded bead of the welding film is separates from the layer of permanent adhesive which remains completely integral with the support film. After release of the sheet, the welded bead is devoid permanent adhesive, which is worn only on the backing 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 reconstitute a bonding interface between the welded bead and 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, re-bonding the sheet on the tray is sometimes difficult. So it is often necessary apply strong pressure to ensure a new bond between the residual welded bead carried by the tray and the permanent adhesive.

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 object of the invention is to propose a packaging sheet allowing, after an initial opening, an easy and reliable replacement thereof to seal the packaging.

A cet effet, l'invention a pour objet une feuille d'emballage stratifiée du type précité, caractérisée en ce que la résistance à la traction perpendiculairement au plan de joint de chacune des deux interfaces de liaison est supérieure à la résistance à la traction de la région intermédiaire de l'épaisseur de la couche d'adhésif permanent comprise entre les deux interfaces de liaison.To this end, the subject of the invention is a laminated packaging sheet of the aforementioned type, characterized in that the tensile strength perpendicularly at the joint plane of each of the two link interfaces is greater the tensile strength of the intermediate region of the thickness of the layer of permanent adhesive between the two bonding interfaces.

Suivant des modes particuliers de réalisation, la feuille d'emballage comporte l'une ou plusieurs des caractéristiques suivantes :

  • la résistance au déchirement du film soudant est inférieure à la résistance à la traction de la région intermédiaire de la couche d'adhésif permanent ;
  • dans la région d'au moins une interface de liaison, au moins l'un du film soudable et du film support présente, sur sa face en contact avec la couche d'adhésif permanent, un traitement de surface adapté pour augmenter la résistance à la traction de la ou de chaque interface de liaison ;
  • le traitement de surface comporte un enduit primaire d'adhésion appliqué sur la face du film en contact avec la couche d'adhésif permanent ;
  • le traitement de surface comporte un traitement mécanique de la face du film en contact avec la couche d'adhésif permanent ;
  • le traitement de surface comporte un traitement par effet Corona ; et
  • l'épaisseur de la couche d'adhésif permanent est comprise entre 10 et 30 microns et notamment sensiblement égale à 20 microns.
According to particular embodiments, the packaging sheet includes one or more of the following characteristics:
  • the tear strength of the sealing film is less than the tensile strength of the intermediate region of the layer of permanent adhesive;
  • in the region of at least one bonding interface, at least one of the weldable film and the support film has, on its face in contact with the layer of permanent adhesive, a surface treatment suitable for increasing the resistance to pulling the or each link interface;
  • the surface treatment comprises a primary adhesion coating applied to the face of the film in contact with the layer of permanent adhesive;
  • the surface treatment comprises a mechanical treatment of the face of the film in contact with the layer of permanent adhesive;
  • the surface treatment includes a treatment using the Corona effect; and
  • the thickness of the layer of permanent adhesive is between 10 and 30 microns and in particular substantially equal to 20 microns.

L'invention a en outre pour objet un emballage comportant une paroi externe délimitant un logement pourvu d'un passage d'accès audit logement, 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 further relates to a packaging comprising a wall external delimiting a housing provided with an access passage to said housing, characterized in that said passage is closed by a laminated sheet according to any one of the preceding claims, which sheet is welded to said outer wall at the periphery of said passage, according to its film weldable 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 made with reference to the drawings, in which:
  • FIG. 1 is a partial perspective view in section of a packaging tray, the access passage of which is closed off 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 packaging 10 shown in Figure 1 consists of a tray rectangular 12 and a flexible cover 14 for closing 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 made of material suitable, for example polyvinyl chloride, covered on its surface interior of a weldable film 18, for example of 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 periphery rim 22 delimiting a flat welding surface of 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 cover 14 consists essentially of a support film 24 and a weldable film 26 with a layer of permanent adhesive 28 interposed flat between them over the entire 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 carrying impressions 32 is secured to the support film 24 by means of 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 layer of permanent adhesive 28, linked to the support film 24, defines a first bonding interface 36. The layer 28 is also bonded to the film welding 26 by a second link interface denoted 38. The interfaces of connection 36, 38 are provided on either side of the thickness of the layer 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 middle part of the permanent adhesive layer defined between the bonding interfaces, also called the core of the adhesive layer, do not not modified by bonding, unlike the boundary layers constituting link interfaces. The middle part of layer 28 is therefore formed only from permanent adhesive which has not undergone any transformation physico-chemical.

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 link 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 area of the leaf, the force of 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, along the connection interfaces 36 and 38, is greater than the cohesive force of the layer of permanent adhesive 28 at 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 relative resistance properties between interfaces on the one hand bond 36, 38 and secondly the core of the permanent adhesive layer are obtained by surface treatments performed on the facing faces support film 24 and welding film 26 to which 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 mechanical, applying a layer of primary adhesion plaster, 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 has lower tear strength than tensile strength of 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 welding, the welding films 18 and 26 melt together, making it possible to obtain after cooling a very reliable weld. In particular, resistance to the tensile strength of the weld 23 is greater than the tear strength of the weldable film 26, tensile strength of interfaces 36 and 38, as well 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 different layers and films of the cover 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 36 micron polyethylene film thick. The welding film 26 is a polyethylene film produced from "Escorene" resin with a thickness of 40 microns adapted to be bonded by heat sealing with 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 layer of permanent adhesive 28 is produced 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 layer of permanent adhesive 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 sold by the company 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 coated polyethylene film with a thickness of 12 microns. This film may have characteristics particular functional features, including sealing characteristics vis-à-vis certain gases. To this end, it is treated 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 according to the nature of the films to be bound.

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 of adhesion is applied to the two faces opposite the films 24 and 26 before placing 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 adhesion coating is replaced at interfaces 36 and 38 by a stamping or embossing carried out by calendering the facing faces of 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 facing faces of the films 24 and 26 are initially subjected to treatment aimed at increasing its surface tension. This treatment is advantageously a treatment to 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 in order 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 strip, 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 achieve separation of the adhesive permanent and one or other of films 24 and 26 respectively according to interfaces 36 and 38 is 12 N, while the force to be applied to break the adhesive at the heart 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 strip, the force to be applied to obtain the tear initial of the weldable film 26 is approximately 20 to 25 N. The force to continue the tearing of the film and cause the simultaneous rupture of the adhesive layer 28 core is 12 to 15 N. In addition, the force to break the weld 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 cover 14 for opening the packaging by lifting the cover. the welding film 26 breaks on either side 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 cover 14 is separated from the tray 12, following at least part of the length of the rim 22. Only one strip, coming from the welding film 26, remains welded to the rim 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 interfaces 36 and 38 is higher 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, part, denoted 42, of the layer permanent adhesive remains on the welded bead 40, while the portion additional, noted 44, remains on the support film 24. The two parts complementary 42, 44 each have a thickness substantially equal to the half of the total thickness of 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 rupture of the layer permanent adhesive is obtained outside the modified boundary layers of it which form the bonding interfaces. The rupture therefore takes place at core of the permanent adhesive layer where the structure and composition of these are not affected by contact with 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 cover 14, the two parts of the adhesive layer 28 are brought back into contact with one another in a unmodified region of the layer since, apart from the binding interfaces 36 and 38. Thus, the connection between the cover 14 and the tray 12 is restored directly at 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 the event of deposit of residues from the packaged product or fatty traces on one of the visible parts of the layer adhesive broken, reclosing is possible since the opposite part retains its adhesive power. After closing the deposit is encapsulated at core 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 has a layer permanent adhesive only in areas to be welded on the edge of the tray. In this case, the support film and the weldable film are linked to each other by a layer of glue of any suitable type.

Claims (8)

Feuille d'emballage stratifiée (14), du type comprenant un film support (24) associé à un film soudable (26) entre lesquels est interposée, au moins en des zones repérées, une couche (28) d'un adhésif permanent, liée au film support (24) et au film soudable (26) suivant deux interfaces de liaison (36, 38), formées de part et d'autre de la partie intermédiaire de la couche d'adhésif permanent (28), caractérisée en ce que 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 de la région intermédiaire de l'épaisseur de la couche d'adhésif permanent (28) comprise entre les deux interfaces de liaison (36, 38).Laminated packaging sheet (14), of the type comprising a film support (24) associated with a weldable film (26) between which is interposed, at least in identified areas, a layer (28) of a permanent adhesive, linked to the support film (24) and to the weldable film (26) according to two interfaces of link (36, 38), formed on either side of the intermediate part of the layer of permanent adhesive (28), characterized in that the resistance to traction perpendicular to the joint plane of each of the two interfaces bond (36, 38) is greater than the tensile strength of the region intermediate thickness of the permanent adhesive layer (28) between the two link interfaces (36, 38). Feuille d'emballage stratifiée (14) selon la revendication 1, caractérisée en ce que la résistance au déchirement du film soudant (26) est inférieure à la résistance à la traction de la région intermédiaire de la couche d'adhésif permanent (28).Laminated packaging sheet (14) according to claim 1, characterized in that the tear strength of the sealing film (26) is lower the tensile strength of the intermediate region of the layer permanent adhesive (28). Feuille d'emballage stratifiée (14) selon la revendication 1 ou 2, caractérisée en ce que, dans la région d'au moins une interface de liaison. au moins l'un du film soudable (26) et du film support (24) présente, sur sa face en contact avec la couche (28) d'adhésif permanent, un traitement de surface adapté pour augmenter la résistance à la traction de la ou de chaque interface de liaison (36, 38).Laminated packaging sheet (14) according to claim 1 or 2, characterized in that, in the region of at least one link interface. at least one of the weldable film (26) and the support film (24) present, on its face in contact with the layer (28) of permanent adhesive, a treatment of surface adapted to increase the tensile strength of the or each link interface (36, 38). Feuille d'emballage stratifiée (14) selon la revendication 3, caractérisée en ce que le traitement de surface comporte un enduit primaire d'adhésion appliqué sur la face du film en contact avec la couche d'adhésif permanent (28).Laminated packaging sheet (14) according to claim 3, characterized in that the surface treatment includes a primary coating of adhesion applied to the face of the film in contact with the adhesive layer permanent (28). Feuille d'emballage stratifiée (14) selon la revendication 3. caractérisée en ce que le traitement de surface comporte un traitement mécanique de la face du film en contact avec la couche d'adhésif permanent (28).Laminated packaging sheet (14) according to claim 3. characterized in that the surface treatment includes mechanical treatment of the face of the film in contact with the layer of permanent adhesive (28). Feuille d'emballage stratifiée (14) selon la revendication 3. caractérisée en ce que le traitement de surface comporte un traitement par effet Corona.Laminated packaging sheet (14) according to claim 3. characterized in that the surface treatment includes a treatment by effect Corona. Feuille d'emballage stratifiée (14) selon l'une quelconque des revendications précédentes, caractérisée en ce que l'épaisseur de la couche d'adhésif permanent (28) est comprise entre 10 et 30 microns et notamment sensiblement égale à 20 microns.Laminated packaging sheet (14) according to any one of claims previous, characterized in that the thickness of the layer permanent adhesive (28) is between 10 and 30 microns and in particular substantially equal to 20 microns. Emballage (10) comportant une paroi externe (16) délimitant un logement (20) pourvu d'un passage d'accès (15) audit logement. caractérisé en ce que ledit passage (15) est obturé par une feuille stratifiée (14) selon l'une quelconque des revendications précédentes, laquelle feuille est soudée sur ladite paroi externe (16) à la périphérie dudit passage (15), suivant son film soudable (26) dans une zone repérée de la feuille qui est pourvue d'adhésif permanent (28).Package (10) comprising an external wall (16) delimiting a housing (20) provided with an access passage (15) to said housing. characterized in that said passage (15) is closed by a laminated sheet (14) according to any one of the preceding claims, which sheet is welded on said outer wall (16) at the periphery of said passage (15), along its weldable film (26) in a marked area of the sheet which is provided 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 true EP0978460A1 (en) 2000-02-09
EP0978460B1 EP0978460B1 (en) 2004-09-29
EP0978460B2 EP0978460B2 (en) 2009-07-15

Family

ID=9529535

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

Family Applications After (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)

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EP (2) EP0978460B2 (en)
AT (1) ATE277833T1 (en)
DE (2) DE69920597T3 (en)
DK (1) DK0978460T4 (en)
ES (1) ES2182737T5 (en)
FR (1) FR2782066B1 (en)
PT (1) PT978460E (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1138610A1 (en) * 2000-03-31 2001-10-04 Danisco Flexible France Laminated packaging sheet and reclosable package containing this laminated sheet
FR2814152A1 (en) * 2000-09-21 2002-03-22 Danisco Flexible France Lid for container such as yoghurt pot made from thermo-formed polymer is shaped for mechanical retention and is equipped with sealing film
FR2817502A1 (en) * 2000-12-06 2002-06-07 Pechiney Emballage Flexible Eu PELABLE AND REFERMABLE OPERATING MATERIAL
WO2003013976A1 (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

Families Citing this family (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

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Publication number Priority date Publication date Assignee Title
EP0554152A1 (en) * 1992-01-27 1993-08-04 SOCIETE ALSACIENNE D'ALUMINIUM Société Anonyme Container having a recloseable membrane provided with a layer of permanent adhesive
FR2741605A1 (en) * 1995-11-29 1997-05-30 Soplaril Sa SHUTTER STRUCTURE FOR A CONTAINER, CONTAINER PROVIDED WITH SUCH STRUCTURE, AND METHOD FOR SHUTTERING THE CONTAINER
WO1997025200A1 (en) * 1996-01-11 1997-07-17 Ato Findley, Inc. Resealable packaging system
EP0812782A1 (en) * 1995-05-16 1997-12-17 Societe Alsacienne D'aluminium Composite web of lids for peel-off thermoplastic containers

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US5172854A (en) † 1991-10-16 1992-12-22 Moshe Epstein Reclosable, reusable package
DE9403710U1 (en) † 1993-03-24 1994-05-26 Bischof & Klein Transparent self-adhesive surface protection film
AU6223896A (en) † 1995-06-07 1996-12-30 Pechiney Recherche Strip for forming peelable reclosable packaging material and package

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554152A1 (en) * 1992-01-27 1993-08-04 SOCIETE ALSACIENNE D'ALUMINIUM Société Anonyme Container having a recloseable membrane provided with a layer of permanent adhesive
EP0812782A1 (en) * 1995-05-16 1997-12-17 Societe Alsacienne D'aluminium Composite web of lids for peel-off thermoplastic containers
FR2741605A1 (en) * 1995-11-29 1997-05-30 Soplaril Sa SHUTTER STRUCTURE FOR A CONTAINER, CONTAINER PROVIDED WITH SUCH STRUCTURE, AND METHOD FOR SHUTTERING THE CONTAINER
WO1997025200A1 (en) * 1996-01-11 1997-07-17 Ato Findley, Inc. Resealable packaging system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1138610A1 (en) * 2000-03-31 2001-10-04 Danisco Flexible France Laminated packaging sheet and reclosable package containing this laminated sheet
FR2807015A1 (en) * 2000-03-31 2001-10-05 Danisco Flexible France LAMINATE PACKAGING SHEET AND RECLOSABLE PACKAGE COMPRISING SAME
FR2814152A1 (en) * 2000-09-21 2002-03-22 Danisco Flexible France Lid for container such as yoghurt pot made from thermo-formed polymer is shaped for mechanical retention and is equipped with sealing film
FR2817502A1 (en) * 2000-12-06 2002-06-07 Pechiney Emballage Flexible Eu PELABLE AND REFERMABLE OPERATING MATERIAL
WO2002045949A1 (en) * 2000-12-06 2002-06-13 Pechiney Emballage Flexible Europe Peelable and reclosable sealing material
WO2003013976A1 (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

Also Published As

Publication number Publication date
DE69920597T3 (en) 2009-12-17
FR2782066A1 (en) 2000-02-11
ES2182737T5 (en) 2009-10-30
FR2782066B1 (en) 2000-11-03
DE69920597T2 (en) 2005-02-17
ATE277833T1 (en) 2004-10-15
DE69920597T8 (en) 2005-11-03
ES2182737T3 (en) 2005-04-16
ES2182737T1 (en) 2003-03-16
EP0978460B1 (en) 2004-09-29
EP0978460B2 (en) 2009-07-15
PT978460E (en) 2005-02-28
DE978460T1 (en) 2003-05-28
DK0978460T3 (en) 2005-01-31
DE69920597D1 (en) 2004-11-04
DK0978460T4 (en) 2009-11-02
EP1491459A1 (en) 2004-12-29

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