EP1223115A1 - Sealing strip for packages and package including said strip - Google Patents

Sealing strip for packages and package including said strip Download PDF

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Publication number
EP1223115A1
EP1223115A1 EP02290085A EP02290085A EP1223115A1 EP 1223115 A1 EP1223115 A1 EP 1223115A1 EP 02290085 A EP02290085 A EP 02290085A EP 02290085 A EP02290085 A EP 02290085A EP 1223115 A1 EP1223115 A1 EP 1223115A1
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EP
European Patent Office
Prior art keywords
strip
layer
undergone
mechanical weakening
treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02290085A
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German (de)
French (fr)
Inventor
Jean-Jacques Provost
Marc Loibl
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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Filing date
Publication date
Application filed by Amcor Flexibles France SAS filed Critical Amcor Flexibles France SAS
Publication of EP1223115A1 publication Critical patent/EP1223115A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5805—Opening or contents-removing devices added or incorporated during package manufacture for tearing a side strip parallel and next to the edge, e.g. by means of a line of weakness
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/40—Packages formed by enclosing successive articles, or increments of material, in webs, e.g. folded or tubular webs, or by subdividing tubes filled with liquid, semi-liquid, or plastic materials
    • B65D75/44—Individual packages cut from webs or tubes
    • B65D75/48—Individual packages cut from webs or tubes containing liquids, semiliquids, or pastes, e.g. cushion-shaped packages

Definitions

  • the present invention relates to a sealing strip for the edge-to-edge junction of complementary edges of two adjacent sides of a flexible packaging, this strip having a width of between 6 mm and 30 mm.
  • the invention further relates to flexible packaging comprising two adjacent sides whose longitudinal edges are joined edge to edge by through such a strip, the longitudinal edges of each pan being each welded to the strip.
  • Flexible packaging is currently widely used for the packaging of food products, such as dairy products fermented liquids, including drinking yogurt or liquid cheese. These packages constitute initially hermetically sealed bags one end of which can be torn in order to open a sampling spout conditioned product.
  • Such packaging is for example made of a polymer sheet folded back on itself and whose longitudinal edges are joined one to the other to form a longitudinal weld. The ends of the tube as well formed are closed by a transverse weld.
  • the two edges of the sheet are thus welded edge to edge on the same strip, which strip extends on either side of the joint as well formed and ensures continuity in the folded sheet in the connection region.
  • Packages of this type generally have an elongated shape and are commonly referred to by the English expression "stick pack”.
  • one of the welds cross ends present, depending on the width of the packaging, a recess defining, on one side, an extension of the welded part and, on the other, a spout for sampling the packaged product.
  • the packaging is torn transversely in the welded region delimited by the recess.
  • a transverse notch is provided at the level of the recess in the part of the weld constituting the extension of the weld which borders the sampling spout, in order to favor the initiation of tearing during of the opening.
  • the packaging machines are adjusted so that the extension of the welded part extends over the sealing strip and the notch transverse extends at least partially from an edge of the packaging into the sealing strip.
  • the extension of the notch in the sealing strip allows a transverse cutting of the sealing strip, when the end of the packaging is torn.
  • the tear cross section of the strip is very delicate, even impossible. Indeed, this tear is not initiated by the extreme part of the notch which would have had to extend into the sealing strip. In this case, the tear, rather than spreading transversely to the strip, follows the edge of the strip, leading to an undesired longitudinal opening of the packaging.
  • the object of the invention is to propose a packaging and a strip of sealing for such packaging allowing easy and reliable opening of the packaging by tearing, even if the notch adapted for the initiation of the tear does not extend into the sealing strip.
  • the invention relates to a strip of the aforementioned type, characterized in that it comprises a layer having undergone, in at least one spotted area, mechanical weakening treatment.
  • the invention also relates to a packaging comprising a strip as defined above.
  • the packaging 10 shown in Figures 1 to 3 constitutes a pocket 12 intended for the packaging of a liquid food preparation such as drinking yogurt. It has a generally elongated tubular shape.
  • the packaging 12 comprises a polymer sheet 14 whose edges longitudinal are joined to each other by a joint 16 extending along the entire length of the package.
  • the sheet 14 defining the essential part of the pocket consists of a polymer sheet made for example of polyethylene.
  • the edges noted 18A, 18B of the sheet 14 are each welded in the region of the seal 16 on the same face of a sealing strip 20.
  • the sealing strip 20 is advantageously disposed inside from the sachet. It extends, equally, on either side of the joint 16, the edges 18A and 18B being thermally welded during the manufacture of the packaging, on either side of the median axis of the strip according to adjacent welds 21A, 21B.
  • the strip advantageously has a width of between 6 mm and 30 mm and preferably substantially equal to 8 mm.
  • the bag 12 is closed by transverse end welds 22, 24.
  • the upper weld 24 has a recess 26 defining a spout 28 for removing the contents of the pocket.
  • the spout 28 extends the main tubular enclosure of the poached.
  • a notch 30 forming a starting point for rupture is arranged transversely in the weld 24, and in particular in its extension noted 32 delimited by the recess 26 opposite the spout 28.
  • the notch 30 may or may not extend as far as the strip 20.
  • the strip 20 comprises, in at least one region marked 34, this region being in the extension of the notch 30, at the minus a layer having undergone a mechanical weakening treatment,
  • This mechanical weakening treatment consists in particular of make at least one of the layers of the strip rough by creating on at least one side of this layer of streaks or grooves advantageously not through.
  • this marked area is positioned along the length of the strip relative to the printing of the sheet 14.
  • the mechanically treated area may be reduced, the treatment mechanical weakening is advantageously carried out on any the surface of the strip.
  • the strip 20 is formed of a laminate comprising three layers complexed to each other by intermediate layers adhesive.
  • the strip 20 has an inner layer 40, advantageously formed a bi-oriented film made for example of polyethylene terephthalate 12 microns. This layer is the one that received mechanical treatment weakening 41.
  • the mechanical weakening treatment consists, for example, in make streaks or grooves on one side of layer 40 through to make this surface rough. This roughness is obtained by abrasion of the surface of the layer. Abrasion results for example the stamping of this layer between two adjacent cylinders, one of the cylinders being covered with an abrasive material such as emery cloth and the other cylinder constituting a support being covered with an elastic material such only rubber.
  • the pressure between the cylinders and the abrasive material are determined in such a way that the ridges and grooves obtained during of the mastering of the film are not emerging.
  • the roughness can also be obtained by the action of a beam laser, or by corona effect.
  • the mechanical weakening treatment of the film 40 consists when making microperforations of the film, these microperforations then being through.
  • the layer 40 thus treated is associated on each of its faces with a welding layer 42, 44.
  • a layer of an adhesive 46, 48 is interposed between each face of the treated layer 40 and the welding layers 42, 44.
  • the laminating of layers 40, 42 and 44 is carried out, for example, by rolling between cylinders.
  • the welding layers 42, 44 are formed for example of polyethylene low density with a thickness of 30 microns.
  • the nature of the welding layers 42 and 44 is chosen as a function of their compatibility with the material constituting the sheet 14 defining the essentials from the pocket.
  • the material of the welding layers 42, 44 is chosen to ensure leak-free sealing between the strip 20 and the sheet 14, and to give sufficient mechanical strength to the strip itself and welds.
  • the material constituting the welding layer 42 or 44 can thus be consisting for example of bi-oriented polypropylene, polyethylene, polypropylene cast, polyvinyl chloride or oriented polystyrene.
  • the strips 14 are packaged in reels and sold as is to the companies in charge of manufacturing the packaging.
  • the present of a weakened layer in the sealing strip 18 promotes tearing transverse of this strip when opening the packaging, even if the notch 30 does not reach the strip.
  • the sheet 14 has also undergone mechanical weakening treatment.
  • the sheet 14 may advantageously have undergone a mechanical weakening treatment in the regions of the sheet intended to be torn apart.
  • the treated region of each package extends transversely to the body of the package at the notch 30.
  • the strip described here has three layers, the strip may have more than three layers.
  • the strip can be manufactured by extrusion-coating of polymers thereby removing the adhesive layers 46, 48.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)

Abstract

The sealing strip (20) for the edge to edge junction of complementary sides (18A,18B) of two adjacent edges of a package has a width between 6 mm and 30 mm. It comprises a layer subjected to a mechanical weakening process after which it is rough. An Independent claim is included for a packaging using the sealing strip.

Description

La présente invention concerne une bandelette de scellage pour la jonction bord à bord de rives complémentaires de deux pans adjacents d'un emballage souple, cette bandelette présentant une largeur comprise entre 6 mm et 30 mm.The present invention relates to a sealing strip for the edge-to-edge junction of complementary edges of two adjacent sides of a flexible packaging, this strip having a width of between 6 mm and 30 mm.

L'invention concerne en outre un emballage souple comportant deux pans adjacents dont les rives longitudinales sont jointes bord à bord par l'intermédiaire d'une telle bandelette, les rives longitudinales de chaque pan étant soudées chacune à la bandelette.The invention further relates to flexible packaging comprising two adjacent sides whose longitudinal edges are joined edge to edge by through such a strip, the longitudinal edges of each pan being each welded to the strip.

Les emballages souples sont actuellement couramment utilisés pour le conditionnement de produits alimentaires, tels que des produits laitiers liquides fermentés, et notamment le yaourt à boire ou le fromage liquide. Ces emballages constituent des poches initialement hermétiquement closes dont une extrémité peut être déchirée afin d'ouvrir un bec de prélèvement du produit conditionné.Flexible packaging is currently widely used for the packaging of food products, such as dairy products fermented liquids, including drinking yogurt or liquid cheese. These packages constitute initially hermetically sealed bags one end of which can be torn in order to open a sampling spout conditioned product.

Un tel emballage est par exemple constitué d'une feuille de polymère repliée sur elle-même et dont les rives longitudinales sont jointes l'une à l'autre afin de former une soudure longitudinale. Les extrémités du tube ainsi formé sont obturées par une soudure transversale.Such packaging is for example made of a polymer sheet folded back on itself and whose longitudinal edges are joined one to the other to form a longitudinal weld. The ends of the tube as well formed are closed by a transverse weld.

Pour assurer la jonction des rives longitudinales de la feuille, il est connu de souder chacune des rives sur une même bandelette de scellage, cette bandelette s'étendant alors suivant toute la longueur de l'emballage.To ensure the junction of the longitudinal edges of the sheet, it is known to weld each of the strands on the same sealing strip, this strip then extending along the entire length of the package.

Les deux rives de la feuille sont ainsi soudées bord à bord sur la même bandelette, laquelle bandelette s'étend de part et d'autre du joint ainsi formé et assure dans la région de liaison la continuité de la feuille repliée.The two edges of the sheet are thus welded edge to edge on the same strip, which strip extends on either side of the joint as well formed and ensures continuity in the folded sheet in the connection region.

Les emballages de ce type présentent généralement une forme allongée et sont couramment désignés par l'expression anglaise "stick pack".Packages of this type generally have an elongated shape and are commonly referred to by the English expression "stick pack".

Afin d'assurer une utilisation commode de l'emballage, l'une des soudures d'extrémité transversales présente, suivant la largeur de l'emballage, un décrochement délimitant, d'un côté, un prolongement de la partie soudée et, de l'autre, un bec de prélèvement du produit emballé.To ensure convenient use of the packaging, one of the welds cross ends present, depending on the width of the packaging, a recess defining, on one side, an extension of the welded part and, on the other, a spout for sampling the packaged product.

Pour l'ouverture du bec de prélèvement, l'emballage est déchiré transversalement dans la région soudée délimitée par le décrochement. For opening the sampling spout, the packaging is torn transversely in the welded region delimited by the recess.

Une entaille transversale est ménagée au niveau du décrochement dans la partie de la soudure constituant le prolongement de la soudure qui borde le bec de prélèvement, afin de favoriser l'initiation du déchirement lors de l'ouverture.A transverse notch is provided at the level of the recess in the part of the weld constituting the extension of the weld which borders the sampling spout, in order to favor the initiation of tearing during of the opening.

Les machines de conditionnement sont réglées afin que le prolongement de la partie soudée s'étende sur la bandelette de scellage et que l'entaille transversale se prolonge au moins partiellement depuis un bord de l'emballage jusque dans la bandelette de scellage. Le prolongement de l'entaille dans la bandelette de scellage permet une découpe transversale de la bandelette de scellage, lors de la déchirure de l'extrémité de l'emballage.The packaging machines are adjusted so that the extension of the welded part extends over the sealing strip and the notch transverse extends at least partially from an edge of the packaging into the sealing strip. The extension of the notch in the sealing strip allows a transverse cutting of the sealing strip, when the end of the packaging is torn.

Dans la pratique, il est difficile de garantir que l'entaille s'achève dans la bande de scellage. Ainsi, on constate que, pour de nombreux emballages, l'entaille s'interrompt avant d'atteindre la bandelette de scellage.In practice, it is difficult to guarantee that the cut ends in the sealing strip. Thus, we see that, for many packages, the cut stops before reaching the sealing strip.

Lors d'une tentative d'ouverture d'un tel emballage, la déchirure transversale de la bandelette est très délicate, voire impossible. En effet, cette déchirure n'est pas initiée par la partie extrême de l'entaille qui aurait dû se prolonger jusque dans la bandelette de scellage. Dans ce cas, la déchirure, plutôt que de se propager transversalement à la bandelette, suit le bord de la bandelette, conduisant à une ouverture longitudinale non souhaitée de l'emballage.When attempting to open such packaging, the tear cross section of the strip is very delicate, even impossible. Indeed, this tear is not initiated by the extreme part of the notch which would have had to extend into the sealing strip. In this case, the tear, rather than spreading transversely to the strip, follows the edge of the strip, leading to an undesired longitudinal opening of the packaging.

L'invention a pour but de proposer un emballage et une bandelette de scellage pour un tel emballage permettant une ouverture aisée et fiable de l'emballage par déchirure, même si l'entaille adaptée pour l'initiation de la déchirure ne se prolonge pas jusque dans la bandelette de scellage.The object of the invention is to propose a packaging and a strip of sealing for such packaging allowing easy and reliable opening of the packaging by tearing, even if the notch adapted for the initiation of the tear does not extend into the sealing strip.

A cet effet, l'invention a pour objet une bandelette du type précité, caractérisée en ce qu'elle comporte une couche ayant subi, en au moins une zone repérée, un traitement mécanique d'affaiblissement.To this end, the invention relates to a strip of the aforementioned type, characterized in that it comprises a layer having undergone, in at least one spotted area, mechanical weakening treatment.

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

  • elle comporte au moins une couche soudante complexée à ladite couche ayant subi un traitement mécanique d'affaiblissement, un adhésif étant interposé entre la ou chaque couche soudante et la couche ayant subi un traitement mécanique d'affaiblissement ;
  • la couche ayant subi un traitement mécanique d'affaiblissement est constituée d'un film bi-orienté ;
  • la couche ayant subi un traitement mécanique d'affaiblissement a une épaisseur comprise entre 5 microns et 40 microns ;
  • la couche ayant subi un traitement mécanique d'affaiblissement présente, dans la ou chaque zone repérée traitée, une multitude de stries ou de rayures non traversantes ; et
  • le traitement mécanique d'affaiblissement s'étend sur toute la surface de la bandelette.
According to particular embodiments, the strip comprises one or more of the following characteristics:
  • it comprises at least one welding layer complexed to said layer having undergone a mechanical weakening treatment, an adhesive being interposed between the or each welding layer and the layer having undergone a mechanical weakening treatment;
  • the layer having undergone a mechanical weakening treatment consists of a bi-oriented film;
  • the layer having undergone a mechanical weakening treatment has a thickness of between 5 microns and 40 microns;
  • the layer having undergone a mechanical weakening treatment has, in the or each marked area treated, a multitude of streaks or non-crossing stripes; and
  • the mechanical weakening treatment extends over the entire surface of the strip.

L'invention a également pour objet un emballage comportant une bandelette telle que définie ci-dessus.The invention also relates to a packaging comprising a strip as defined above.

En outre, l'emballage peut comporter l'une ou plusieurs des caractéristiques suivantes :

  • il comporte, dans une région soudée, une entaille ménagée sensiblement transversalement à l'axe de la bandelette ;
  • il comporte au moins un film souple constituant les deux pans adjacents, le ou chaque film souple étant dépourvu de traitement mécanique d'affaiblissement ; et
  • il comporte au moins un film souple constituant les deux pans adjacents, le ou chaque film souple ayant subi, en au moins une zone repérée, un traitement mécanique d'affaiblissement.
In addition, the packaging may include one or more of the following characteristics:
  • it comprises, in a welded region, a notch formed substantially transversely to the axis of the strip;
  • it comprises at least one flexible film constituting the two adjacent sides, the or each flexible film being devoid of mechanical weakening treatment; and
  • it comprises at least one flexible film constituting the two adjacent sides, the or each flexible film having undergone, in at least one identified area, a mechanical weakening treatment.

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 :

  • les figures 1 et 2 sont des vues en élévation d'un sachet d'emballage selon l'invention ;
  • la figure 3 est une vue en section de l'emballage de la figure 1 prise suivant la ligne II-II ; et
  • la figure 4 est une vue en section transversale de la bandelette de scellage de l'emballage des figures 1 à 3.
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:
  • Figures 1 and 2 are elevational views of a packaging bag according to the invention;
  • Figure 3 is a sectional view of the package of Figure 1 taken along line II-II; and
  • FIG. 4 is a cross-sectional view of the sealing strip of the packaging of FIGS. 1 to 3.

L'emballage 10 représenté aux figures 1 à 3 constitue une poche 12 destinée au conditionnement d'une préparation alimentaire liquide telle que du yaourt à boire. Il présente une forme tubulaire généralement allongée. The packaging 10 shown in Figures 1 to 3 constitutes a pocket 12 intended for the packaging of a liquid food preparation such as drinking yogurt. It has a generally elongated tubular shape.

L'emballage 12 comporte une feuille de polymère 14 dont les rives longitudinales sont jointes l'une à l'autre par un joint 16 s'étendant suivant toute la longueur de l'emballage. La feuille 14 délimitant l'essentiel de la poche est constituée d'une feuille de polymère réalisée par exemple en polyéthylène. Les rives notées 18A, 18B de la feuille 14 sont soudées chacune dans la région du joint 16 sur une même face d'une bandelette de scellage 20.The packaging 12 comprises a polymer sheet 14 whose edges longitudinal are joined to each other by a joint 16 extending along the entire length of the package. The sheet 14 defining the essential part of the pocket consists of a polymer sheet made for example of polyethylene. The edges noted 18A, 18B of the sheet 14 are each welded in the region of the seal 16 on the same face of a sealing strip 20.

La bandelette de scellage 20 est avantageusement disposée à l'intérieur du sachet. Elle s'étend, à part égale, de part et d'autre du joint 16, les rives 18A et 18B étant soudées thermiquement lors de la fabrication de l'emballage, de part et d'autre de l'axe médian de la bandelette suivant des soudures adjacentes 21A, 21B.The sealing strip 20 is advantageously disposed inside from the sachet. It extends, equally, on either side of the joint 16, the edges 18A and 18B being thermally welded during the manufacture of the packaging, on either side of the median axis of the strip according to adjacent welds 21A, 21B.

La bandelette a avantageusement une largeur comprise entre 6 mm et 30 mm et de préférence sensiblement égale à 8 mm.The strip advantageously has a width of between 6 mm and 30 mm and preferably substantially equal to 8 mm.

A chacune des extrémités de l'emballage, la poche 12 est obturée par des soudures transversales d'extrémité 22, 24. La soudure supérieure 24 présente un décrochement 26 définissant un bec 28 de prélèvement du contenu de la poche. Le bec 28 prolonge l'enceinte principale tubulaire de la poche.At each end of the packaging, the bag 12 is closed by transverse end welds 22, 24. The upper weld 24 has a recess 26 defining a spout 28 for removing the contents of the pocket. The spout 28 extends the main tubular enclosure of the poached.

En regard du bec 28, une entaille 30 formant une amorce de rupture est ménagée transversalement dans la soudure 24, et notamment dans son prolongement noté 32 délimité par le décrochement 26 en regard du bec 28.Next to the spout 28, a notch 30 forming a starting point for rupture is arranged transversely in the weld 24, and in particular in its extension noted 32 delimited by the recess 26 opposite the spout 28.

L'entaille 30 se prolonge ou non jusque dans la bandelette 20.The notch 30 may or may not extend as far as the strip 20.

Selon l'invention la bandelette 20 comporte, en au moins une région repérée 34, cette région se situant dans le prolongement de l'entaille 30, au moins une couche ayant subi un traitement mécanique d'affaiblissement,According to the invention the strip 20 comprises, in at least one region marked 34, this region being in the extension of the notch 30, at the minus a layer having undergone a mechanical weakening treatment,

Ce traitement mécanique d'affaiblissement consiste notamment à rendre au moins l'une des couches de la bandelette rugueuse en créant sur au moins une face de cette couche des stries ou des rainures avantageusement non traversantes.This mechanical weakening treatment consists in particular of make at least one of the layers of the strip rough by creating on at least one side of this layer of streaks or grooves advantageously not through.

Dans le cas où le traitement mécanique d'affaiblissement s'étend seulement en au moins une zone repérée, cette zone repérée est positionnée suivant la longueur de la bandelette par rapport à l'impression de la feuille 14.In the event that the mechanical weakening treatment extends only in at least one marked area, this marked area is positioned along the length of the strip relative to the printing of the sheet 14.

Bien que la zone traitée mécaniquement puisse être réduite, le traitement mécanique d'affaiblissement est avantageusement réalisé sur toute la surface de la bandelette.Although the mechanically treated area may be reduced, the treatment mechanical weakening is advantageously carried out on any the surface of the strip.

Un exemple de la structure d'une telle bandelette est illustré sur la figure 4.An example of the structure of such a strip is illustrated on the figure 4.

Sur cette figure, la bandelette 20 est formée d'un stratifié comportant trois couches complexées les unes aux autres par des couches intermédiaires d'adhésif.In this figure, the strip 20 is formed of a laminate comprising three layers complexed to each other by intermediate layers adhesive.

La bandelette 20 présente une couche intérieure 40, formée avantageusement d'un film bi-orienté constitué par exemple en polyéthylène téréphtalate de 12 microns. Cette couche est celle ayant reçu un traitement mécanique d'affaiblissement 41.The strip 20 has an inner layer 40, advantageously formed a bi-oriented film made for example of polyethylene terephthalate 12 microns. This layer is the one that received mechanical treatment weakening 41.

Le traitement mécanique d'affaiblissement consiste par exemple à réaliser sur l'une des faces de la couche 40 des stries ou des rainures non traversantes afin de rendre cette surface rugueuse. Cette rugosité est obtenue par abrasion de la surface de la couche. L'abrasion résulte par exemple du matriçage de cette couche entre deux cylindres adjacents, l'un des cylindres étant couvert d'un matériau abrasif tel que de la toile émeri et l'autre cylindre constituant un support étant recouvert d'un matériau élastique tel que du caoutchouc.The mechanical weakening treatment consists, for example, in make streaks or grooves on one side of layer 40 through to make this surface rough. This roughness is obtained by abrasion of the surface of the layer. Abrasion results for example the stamping of this layer between two adjacent cylinders, one of the cylinders being covered with an abrasive material such as emery cloth and the other cylinder constituting a support being covered with an elastic material such only rubber.

Avantageusement, la pression entre les cylindres et le matériau abrasif sont déterminés de manière à ce que les stries et rainures obtenues lors du matriçage du film ne soient pas débouchantes.Advantageously, the pressure between the cylinders and the abrasive material are determined in such a way that the ridges and grooves obtained during of the mastering of the film are not emerging.

La rugosité peut également être obtenue par action d'un faisceau laser, ou par effet corona.The roughness can also be obtained by the action of a beam laser, or by corona effect.

En variante, le traitement mécanique d'affaiblissement du film 40 consiste en la réalisation de microperforations du film, ces microperforations étant alors traversantes.Alternatively, the mechanical weakening treatment of the film 40 consists when making microperforations of the film, these microperforations then being through.

La couche 40 ainsi traitée est associée sur chacune de ses faces à une couche soudante 42, 44. Une couche d'un adhésif 46, 48 est interposée entre chaque face de la couche traitée 40 et des couches soudantes 42, 44. The layer 40 thus treated is associated on each of its faces with a welding layer 42, 44. A layer of an adhesive 46, 48 is interposed between each face of the treated layer 40 and the welding layers 42, 44.

Le complexage des couches 40, 42 et 44 est réalisé, par exemple, par laminage entre des cylindres.The laminating of layers 40, 42 and 44 is carried out, for example, by rolling between cylinders.

Les couches soudantes 42, 44 sont formées par exemple de polyéthylène basse densité d'une épaisseur de 30 microns.The welding layers 42, 44 are formed for example of polyethylene low density with a thickness of 30 microns.

La nature des couches soudantes 42 et 44 est choisie en fonction de leur compatibilité avec le matériau constituant la feuille 14 délimitant l'essentiel de la poche.The nature of the welding layers 42 and 44 is chosen as a function of their compatibility with the material constituting the sheet 14 defining the essentials from the pocket.

En particulier, le matériau des couches soudantes 42, 44 est choisi pour assurer un scellage sans fuite entre la bandelette 20 et la feuille 14, et pour conférer une résistance mécanique suffisante à la bandelette elle-même et aux soudures.In particular, the material of the welding layers 42, 44 is chosen to ensure leak-free sealing between the strip 20 and the sheet 14, and to give sufficient mechanical strength to the strip itself and welds.

Comme il apparaít sur la figure 3, seule l'une des faces de la bandelette est soudée contre la surface intérieure de la feuille 14. L'autre couche de la bandelette assure une protection de la couche intermédiaire traitée 40, évitant ainsi que le produit alimentaire contenu dans la poche n'entre en contact avec cette couche.As it appears in Figure 3, only one of the faces of the strip is welded against the inner surface of the sheet 14. The other layer of the strip provides protection for the treated intermediate layer 40, thus preventing the food product contained in the bag from entering contact with this layer.

Le matériau constituant la couche soudante 42 ou 44 peut ainsi être constitué par exemple de polypropylène bi-orienté, de polyéthylène, de polypropylène coulé, de polychlorure de vinyle ou de polystyrène orienté.The material constituting the welding layer 42 or 44 can thus be consisting for example of bi-oriented polypropylene, polyethylene, polypropylene cast, polyvinyl chloride or oriented polystyrene.

Afin de permettre la réalisation des emballages sur des machines automatiques, les bandelettes 14 sont conditionnées en bobines et vendues telles quelles aux entreprises en charge de fabrication de l'emballage.In order to allow packaging to be carried out on machines automatic, the strips 14 are packaged in reels and sold as is to the companies in charge of manufacturing the packaging.

On constate qu'avec un emballage selon l'invention, la présente d'une couche affaiblie dans la bandelette de scellage 18 favorise la déchirure transversale de cette bandelette lors de l'ouverture de l'emballage, même si l'entaille 30 n'atteint pas la bandelette.It can be seen that with a packaging according to the invention, the present of a weakened layer in the sealing strip 18 promotes tearing transverse of this strip when opening the packaging, even if the notch 30 does not reach the strip.

En outre, pour un tel emballage, il n'est pas nécessaire que la feuille 14 ait également subi un traitement mécanique d'affaiblissement.In addition, for such packaging, it is not necessary that the sheet 14 has also undergone mechanical weakening treatment.

Toutefois, en variante, la feuille 14 peut avantageusement avoir subi un traitement mécanique d'affaiblissement dans les régions de la feuille destinées à être déchirées. Dans ce cas, la région traitée de chaque emballage s'étend transversalement au corps de l'emballage au niveau de l'entaille 30. However, as a variant, the sheet 14 may advantageously have undergone a mechanical weakening treatment in the regions of the sheet intended to be torn apart. In this case, the treated region of each package extends transversely to the body of the package at the notch 30.

Bien que la bandelette décrite ici comporte trois couches, la bandelette peut comporter plus de trois couches.Although the strip described here has three layers, the strip may have more than three layers.

En outre, la bandelette peut être fabriquée par extrusion-couchage de polymères supprimant ainsi les couches d'adhésif 46, 48.In addition, the strip can be manufactured by extrusion-coating of polymers thereby removing the adhesive layers 46, 48.

Claims (10)

Bandelette de scellage (20) pour la jonction bord à bord de rives complémentaires (18A, 18B) de deux pans adjacents d'un emballage, laquelle bandelette (20) présente une largeur comprise entre 6 mm et 30 mm, caractérisée en ce qu'elle comporte une couche (40) ayant subi, en au moins une zone repérée, un traitement mécanique d'affaiblissement, la couche ayant subi le traitement mécanique d'affaiblissement étant rugueuse après traitement.Sealing strip (20) for the edge-to-edge joining of complementary edges (18A, 18B) of two adjacent sides of a package, which strip (20) has a width of between 6 mm and 30 mm, characterized in that it comprises a layer (40) having undergone, in at least one identified area, a mechanical weakening treatment, the layer having undergone the mechanical weakening treatment being rough after treatment. Bandelette selon la revendication 1, caractérisée en ce qu'elle comporte au moins une couche soudante (42, 44) complexée à ladite couche (40) ayant subi un traitement mécanique d'affaiblissement, un adhésif (46, 48) étant interposé entre la ou chaque couche soudante (42, 44) et la couche (40) ayant subi un traitement mécanique d'affaiblissement.Strip according to claim 1, characterized in that it comprises at least one weldable layer (42, 44) complexed with said layer (40) having undergone a mechanical weakening treatment, an adhesive (46, 48) being interposed between the or each weldable layer (42, 44) and the layer (40) having undergone a mechanical weakening treatment. Bandelette selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche (40) ayant subi un traitement mécanique d'affaiblissement est constituée d'un film bi-orienté.Strip according to any one of the preceding claims, characterized in that the layer (40) having undergone a mechanical weakening treatment consists of a bi-oriented film. Bandelette selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche (40) ayant subi un traitement mécanique d'affaiblissement a une épaisseur comprise entre 5 microns et 40 microns.Strip according to any one of the preceding claims, characterized in that the layer (40) having undergone a mechanical weakening treatment has a thickness of between 5 microns and 40 microns. Bandelette selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche (40) ayant subi un traitement mécanique d'affaiblissement présente, dans la ou chaque zone repérée traitée, une multitude de stries ou de rayures non traversantes.Strip according to any one of the preceding claims, characterized in that the layer (40) having undergone a mechanical weakening treatment has, in the or each marked area treated, a multitude of streaks or non-crossing stripes. Bandelette selon l'une quelconque des revendications précédentes, caractérisée en ce que le traitement mécanique d'affaiblissement s'étend sur toute la surface de la bandelette.Strip according to any one of the preceding claims, characterized in that the mechanical weakening treatment extends over the entire surface of the strip. Emballage (10) comportant deux pans adjacents dont les rives (18A, 18B) complémentaires sont jointes bord à bord par l'intermédiaire d'une bandelette de scellage (20) selon l'une quelconque des revendications précédentes, les rives complémentaires (18A, 18B) des deux pans étant soudées chacune sur la bandelette (20). Package (10) comprising two adjacent sides, the edges of which (18A, 18B) are joined edge to edge through a sealing strip (20) according to any one of claims previous, the complementary edges (18A, 18B) of the two sides being each welded to the strip (20). Emballage selon la revendication 7, caractérisé en ce qu'il comporte, dans une région soudée (32), une entaille (30) ménagée sensiblement transversalement à l'axe de la bandelette (20).Packaging according to claim 7, characterized in that it comprises, in a welded region (32), a notch (30) formed substantially transversely to the axis of the strip (20). Emballage selon la revendication 7 ou 8, caractérisé en ce qu'il comporte au moins un film souple (14) constituant les deux pans adjacents, le ou chaque film souple (14) étant dépourvu de traitement mécanique d'affaiblissement.Packaging according to claim 7 or 8, characterized in that it comprises at least one flexible film (14) constituting the two adjacent sides, the or each flexible film (14) being devoid of mechanical weakening treatment. Emballage selon la revendication 7 ou 8, caractérisé en ce qu'il comporte au moins un film souple (14) constituant les deux pans adjacents, le ou chaque film souple (14) ayant subi, en au moins une zone repérée, un traitement mécanique d'affaiblissement.Packaging according to claim 7 or 8, characterized in that it comprises at least one flexible film (14) constituting the two adjacent sides, the or each flexible film (14) having undergone, in at least one marked area, a mechanical treatment weakening.
EP02290085A 2001-01-15 2002-01-14 Sealing strip for packages and package including said strip Withdrawn EP1223115A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0100491 2001-01-15
FR0100491A FR2819489B1 (en) 2001-01-15 2001-01-15 SEALING STRIP FOR PACKAGING AND PACKAGING COMPRISING SAME

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EP1223115A1 true EP1223115A1 (en) 2002-07-17

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1464587A1 (en) * 2003-03-28 2004-10-06 Alcan Packaging Italia S.r.l. Packaging of the stickpack type with improved opening and method for manufacturing the same
WO2010105775A3 (en) * 2009-03-17 2010-11-25 Boehringer Ingelheim International Gmbh Reservoir and atomizer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996017792A1 (en) * 1994-12-07 1996-06-13 Rexam Medical Packaging, Inc. Polymeric package opening structure
WO1997027046A1 (en) * 1996-01-25 1997-07-31 American National Can Company Method to achieve easy-opening flexible packaging laminates and packaging materials made therefrom
EP1057746A2 (en) * 1999-04-26 2000-12-06 Hassia Verpackungsmaschinen GmbH Tubular bag package with tear aid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996017792A1 (en) * 1994-12-07 1996-06-13 Rexam Medical Packaging, Inc. Polymeric package opening structure
WO1997027046A1 (en) * 1996-01-25 1997-07-31 American National Can Company Method to achieve easy-opening flexible packaging laminates and packaging materials made therefrom
EP1057746A2 (en) * 1999-04-26 2000-12-06 Hassia Verpackungsmaschinen GmbH Tubular bag package with tear aid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1464587A1 (en) * 2003-03-28 2004-10-06 Alcan Packaging Italia S.r.l. Packaging of the stickpack type with improved opening and method for manufacturing the same
WO2010105775A3 (en) * 2009-03-17 2010-11-25 Boehringer Ingelheim International Gmbh Reservoir and atomizer
US8905017B2 (en) 2009-03-17 2014-12-09 Boehringer Ingelheim International Gmbh Reservoir and atomizer

Also Published As

Publication number Publication date
FR2819489A1 (en) 2002-07-19
FR2819489B1 (en) 2003-07-04

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