EP1773683B1 - Package comprising a plastic container closed with a peelable inner seal heat-sealed to said container - Google Patents

Package comprising a plastic container closed with a peelable inner seal heat-sealed to said container Download PDF

Info

Publication number
EP1773683B1
EP1773683B1 EP05786144A EP05786144A EP1773683B1 EP 1773683 B1 EP1773683 B1 EP 1773683B1 EP 05786144 A EP05786144 A EP 05786144A EP 05786144 A EP05786144 A EP 05786144A EP 1773683 B1 EP1773683 B1 EP 1773683B1
Authority
EP
European Patent Office
Prior art keywords
layer
sealing
packaging according
extruded
coextruded
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.)
Not-in-force
Application number
EP05786144A
Other languages
German (de)
French (fr)
Other versions
EP1773683A1 (en
Inventor
Jean-Luc Rick
Isabelle Jenny
Guy Boiron
Alain Grayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amcor Flexibles Selestat SAS
Original Assignee
Alcan Packaging Selestat
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34948210&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1773683(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Alcan Packaging Selestat filed Critical Alcan Packaging Selestat
Priority to PL05786144T priority Critical patent/PL1773683T3/en
Priority to SI200531035T priority patent/SI1773683T1/en
Publication of EP1773683A1 publication Critical patent/EP1773683A1/en
Application granted granted Critical
Publication of EP1773683B1 publication Critical patent/EP1773683B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure

Definitions

  • the invention relates to the field of packaging comprising pots or plastic containers generally containing fresh dairy products, typically yoghurt, sealed with lids.
  • These covers are formed of a flexible multilayer material comprising a sealing layer and adapted to be sealed, typically by heat sealing, on a sealing pad of a pot or plastic container, in order to seal it.
  • This sealing range defines a filling and sampling aperture, and the lids, once heat-sealed on the range of the pot, can be separated from the pot by peeling.
  • These lids may either form pre-cut lids or form a lidding leaf.
  • lidding sheets corresponding to the preamble of claim 1 attached and intended to close rigid trays of large size.
  • These lidding sheets have the following structure: sealing layer of PP and PE / adhesion promoter layer / layer of barrier material, optionally supplemented with an adhesive layer and a protective layer.
  • These sheets have a sealing layer of about 12 ⁇ m and are manufactured by laminating this sealing layer to the barrier material layer via the adhesion promoter.
  • a disadvantage of the usual lids today is that they often tear during peeling when opening packages and they are detached as part of the beach.
  • the sealing conditions are not optimal, especially in the industrial sealing conditions, that the adhesion to the boundary surface between the seal layer of the seal and the substrate of the sealing range. sealing is so weak that it can occur, already during transport, a local separation of the lid and the range of the pot in the sealing region and thus an unplanned opening and in some cases even undetectable of the package, so that the shelf life of the content is no longer guaranteed.
  • the object of the invention is to provide lids, in the form of lidding sheets in a reel or in the form of pre-cut lidded stacks, which do not have the abovementioned disadvantages of lids made of aluminum foil or of paper composite multilayer material. / PET currently used and comprising a layer of sealing lacquer.
  • the invention relates to economical seals to manufacture and comply with current environmental guidelines for packaging materials.
  • the package comprises a plastic container having a range defining a filling and sampling aperture, said container containing a product, typically a food product, and a lid of a flexible sealing foil sealed by heat-sealing on the container surface by means of a sealing layer and detachable from it by peeling, said seal being secured to said range of said container by a sealing bead, the lidding sheet comprising a support sheet and an extruded layer or a coextruded layer of plastic material, said extruded layer forming said sealing layer, said coextruded layer comprising a layer forming said sealing layer, said extruded or coextruded layer having a thickness Ec chosen so that said peeling of the lid causes a cohesive rupture of the extruded or coextruded layer, the package being characterized in that said extruded or coextruded layer is formed of a material chosen so as to adhere, by its outer face, to said support sheet, and by its inner face, to said range during
  • the invention also relates to a seal intended to be sealed on this packaging, and a method of manufacturing the sealing foil.
  • the covers according to the invention solve the problems posed. Indeed, on the one hand, the applicant was surprised to find that it was possible to have an extruded layer providing the sealing layer function, and contributing significantly to the thickness of the lid, and that to his holding or his "hand", that is to say the impression felt by the consumer during the manual gripping of the edge of the lid for the opening of the sealed package. On the other hand, it has been able to observe both the ease of opening by peeling of the lid and the stability of the peel force, probably due to the cohesive rupture of the extruded or coextruded layer, as well as the relative wide latitude or tolerance of sealing conditions, which is very important in practice.
  • the lids according to the invention probably due to a relatively large extruded layer thickness, ensured both a high stability of the peel force and especially a low sensitivity of the final seal. containers to the heat sealing conditions. Indeed, especially in the case where the covers form a sheet of operculum of large width, typically greater than 300 mm, there may be local differences in pressure of the heat sealing jaws, in the direction of the width of the foil. lidding. Thus, it appeared that the sealing quality of the extruded or coextruded layer was independent of the depth of the annular groove formed by the pressure exerted by a sealing tool during heat sealing.
  • these covers are of economical manufacture taking into account that a large part of the lid is constituted by an extruded or coextruded layer, so that at least the major part of the lid is an extruded or coextruded layer formed from a thermoplastic material in the least elaborate form that is, namely in the form of granules.
  • cohesive rupture of the extruded or coextruded layer is meant that, during the peel removal of a lid made with the foil of the invention according to the invention and sealed against the range of the opening of a plastic container or container, material separation occurs within the extruded or coextruded layer, with a portion of the extruded layer remaining on the sealing range of the container and another portion on the carrier sheet of the container; operculum.
  • the structure of the extruded or coextruded layer is chosen depending on the plastic material used for the carrier sheet and the container material. Indeed, the adhesion between the support sheet and the extruded or coextruded layer on the one hand, and between the extruded or coextruded layer and the container on the other hand after the sealing of the lid on the range of the container, must at least in those portions of the sealing region which are critical for seal sealing, to be larger than the cohesive adhesion within the extruded or coextruded layer, so as to have cohesive failure of the extruded layer.
  • the layered structure of the extruded or coextruded layer is selected depending on the properties desired for the seal.
  • the figure 1 is a perspective view of a plurality of packages (1) comprising four containers or containers (10) made of plastic material sealed with lids (16) sealed and formed into a lidding sheet (17).
  • the peeling of a lid (16) was initiated by manually pulling on a corner of the cover or tear-off tab (19).
  • the seal (16) has been partially removed on a portion of the container (10) where the sealing trace (183) of the sealing bead (18) has been shown , the seal (16) being present on the other part where the sealing bead (18) has been shown.
  • the figure 2 shows, in enlarged view and in a vertical plane II perpendicular to the plane of the lid, a section of the sealing cord (18) of a package (1) of the Fig. 1 , comprising a cover (16) consisting of a carrier sheet (20) and an extruded layer (22 ') forming said sealing layer (38') or a coextruded layer (22) comprising said sealing layer ( 38), the layers of said coextruded layer (22) having not been shown to be distinct from each other.
  • the Fig. 3 represents a cross section of a modality of a coextruded layer (22) comprising three layers (34), (36) and (38), while the figure 4 represents a cross section of another coextruded layer modality comprising two layers (34) and (38).
  • the layer (36) has not been hatched.
  • the figure 5 illustrates schematically in cross-section similar to that of the figure 3 manufacturing a lidding sheet (17) by supplying a carrier sheet (20) and coextruding a layer (22).
  • the layers (21) and (40) have not been hatched.
  • the figure 6 analogous to the right part of there figure 5 , represents a sealing sheet modality (17) in which the coextruded layer (22) is assembled to a support sheet (20) comprising successively externally: a primer layer (39), an imprint ( 41) and an overprint varnish layer (42).
  • a primer layer (39), an imprint ( 41) and an overprint varnish layer (42) In this figure, the layers (39), (40) and (42) have not been hatched.
  • the figure 7 is a perspective view of a lidding sheet reel (17).
  • the figure 8 is at its upper part, a cross-sectional view of a stack (17 ') of pre-cut lids (16'), and at its lower part, a top view of a pre-cut seal (16 ') printed.
  • the support sheet (20) can be a plastic sheet.
  • carrier sheet is meant here the sheet which is coated on one side with the coextruded extruded layer (22 ') (22).
  • the carrier sheet although preferably made of plastic material, may also comprise a sheet of paper and / or aluminum.
  • other layers of plastic, aluminum or paper, possibly printed and provided with a protective lacquer may be disposed on the other side of said support sheet (20).
  • Said plastic sheet may be made of a plastic material chosen from: a polyester, in particular polyethylene terephthalate (PET), a polyolefin, in particular a polypropylene (PP), a polyamide (PA) or a cycloolefinic copolymer ( COC).
  • a plastic material chosen from: a polyester, in particular polyethylene terephthalate (PET), a polyolefin, in particular a polypropylene (PP), a polyamide (PA) or a cycloolefinic copolymer ( COC).
  • Said support sheet (20) is covered on one of its inner or outer faces by a metallization layer (21).
  • said metallization layer (21) may cover said outer face of said support sheet (20), as shown in FIG. figure 5 .
  • Said support sheet (20) can be obtained either from a film of said plastic material supplied in a reel, or possibly by a second extrusion or coextrusion from said plastic material supplied in the form of granules.
  • said support sheet and / or said metallization layer may comprise, on at least one of its faces, a layer of a primer (39, 40). .
  • the thickness of the carrier sheet (20) is generally between about 7 and 200 ⁇ m and depends on the size and weight of the contents of the container to be closed.
  • said extruded (22 ') or coextruded layer (22) may have a thickness Ec ranging from 5 ⁇ m to 80 ⁇ m, and typically from 15 ⁇ m to 60 ⁇ m.
  • said extruded (22 ') or coextruded layer (22) may have a thickness Ec ranging from 25 .mu.m to 40 .mu.m, and typically a thickness ranging from 30 .mu.m to 35 .mu.m.
  • the coextruded layer (22) may comprise three layers and have an adhesive layer (34) joined to the backing sheet (26), an intermediate layer (36) and a sealing layer (38) joined to the beach ( 12) of the container (10).
  • the coextruded layer (22) may comprise two layers and have an adhesive layer (34) joined to the carrier sheet (20) and a sealing layer (38) joined to the range (12) of the container (10) .
  • the adhesive layer (34) may contain at least one of the following components: graft copolymers and / or copolymers and / or terpolymers comprising acid groups or ionomers, metallocene PE, linear PE, EVA copolymers, EMA copolymers , copolymers of EEA, copolymers of EBA, mixtures of these components or a polyolefin with a tackifying resin.
  • Said adhesive layer (34) can have a thickness ranging from 2 microns to 10 microns.
  • Said sealing layer (38) can contain at least one of the following components: copolymer of ethylene and vinyl acetate (EVA), copolymer of ethylene and methyl acrylate (EMA), copolymer of ethylene and butyl acrylate (EBA), copolymer of ethylene and ethyl acrylate (EEA), terpolymers with ⁇ -olefin monomers comprising esters.
  • EVA copolymer of ethylene and vinyl acetate
  • EMA copolymer of ethylene and methyl acrylate
  • EBA copolymer of ethylene and butyl acrylate
  • EOA copolymer of ethylene and ethyl acrylate
  • terpolymers with ⁇ -olefin monomers comprising esters terpolymers with ⁇ -olefin monomers comprising esters.
  • Said sealing layer may comprise at least one of said components and at least one tackifying resin.
  • Said sealing layer may have a thickness ranging from 5 ⁇ m to 70 ⁇ m, and typically from 10 ⁇ m to 30 ⁇ m.
  • Said intermediate layer (36) may contain at least one of the following components: polyamide (PA), polymer and copolymer of cycloolefin (COC), homo- and copolymers of polyolefins with or without mineral or organic fillers.
  • the intermediate layer (36) may comprise a mineral filler such as, for example, talc, at a weight content typically ranging from 5% to 30%, so as to promote the cohesive failure of said intermediate layer during the opening of said packaging.
  • sealing layer (38, 38 ') may comprise an inorganic or organic filler, for example talc, at a weight content typically ranging from 5% to%, so as to promote the cohesive failure of said coating layer. sealing when opening said package.
  • Said intermediate layer (36) may have a thickness ranging from 2 microns to 40 microns.
  • the container (10) can be made of a material chosen from: a polystyrene (PS), a polyester (PET), a polyolefin, in particular polyethylene (PE) or polypropylene (PP), the polymer of vinyl chlorine (PVC).
  • PS polystyrene
  • PET polyester
  • PP polypropylene
  • PVC vinyl chlorine
  • Said cover (16) is typically a printed cover, a printed pattern (41) that can be formed on an outer face of said support sheet (20) or said metallization layer (21) or said primary attachment layer (39). ).
  • an overprint varnish (42) may cover said printed pattern (41).
  • Said operculum sheet (17) of said seal (16) may have a thickness ranging from 10 ⁇ m to 90 ⁇ m, said support sheet (20) having a thickness Es and said coextruded layer (22) having a thickness Ec such that the Ec / Es ratio is at least 1, and is typically between 2 and 4.
  • said sealing bead (18), formed during said heat sealing by a sealing tool (24), may comprise a collapsed annular central portion (180) bordered by two peripheral beads (181, 182), a inner bead (181) and an outer bead (182), said peripheral bead (181, 182) comprising an over-thickness t 'of said coextruded layer (22), said over-thickness being at least 1.5. .
  • Another object of the invention is constituted by a lid (16) intended to obtain, by heat-sealing on said container (10), said package (1) according to the invention, said lid (16) being a part of said foil lidding (17) or a pre-cut lid (16 ') of a stack (17') of pre-cut lids in said lidding foil (17).
  • Packaging (1) has been manufactured according to the figure 1 .
  • the Fig. 1 shows a provision with four pots or plastic containers (10) for packaging fresh products, for example yoghurt.
  • four pots (10) are assembled to each other.
  • Each pot (10) has a sealing pad (12) surrounding an opening (14) covered by a lid (16) of a lidding foil (17).
  • the operculum sheet 17 is sealed on the sealing pad (12) according to a sealing cord (18), cord (18) which has been shown in the bottom right of the figure 1 .
  • Peeling of the operculum (16) gives access to the opening (14) of the pot and allows to take all or part of the contents of the pot.
  • the individual pots (10) are assembled by the sealing pad (12) forming a plurality of closed pots, after filling, by a sealing sheet (17) forming a plurality of lids (16).
  • a sealing sheet (17) forming a plurality of lids (16.
  • common edge edges are provided, which can be easily separated by hand along marked or cut lines of weakness in the sealing range (12).
  • the lidding foil (17) is also cut into individual lids (16), so that each lid (16) can be removed individually.
  • Each cap (16) is thus freely applied to the sealing surface (12) of the pot (10) and sealed along the sealing bead (18), so that outside this sealing bead (18), the package (1) comprises a tear tab 19 at each of the four corners of the sealing range (12) of each pot (10).
  • the Fig. 2 shows the displacements or creep of material that occur during the sealing of the lidding foil (17) or the lid (16) on the sealing range (12) of the pot (10) of the figure 1 .
  • the sealing bead (18) comprises a collapsed annular central portion (180) bordered by two peripheral beads (181, 182), an inner bead (181) and an outer bead (182), said peripheral bead (181).
  • the sealing range (12) of the pot (10) comprises an annular groove (26), of depth t, corresponding to the annular central annular portion (180), and two sealing rings (28) and (29) corresponding to peripheral beads (181) and (182) of the sealing bead (18).
  • the material discharged by the formation of the groove (26) thus leads to the formation of sealing rings (28) and (29) on either side of the groove (26).
  • the coextruded layer (22) is discharged largely out of the groove (26). ) in the sealing range (12) of the pot (10), so that a thin annular central portion (32) substantially corresponding to said collapsed annular central portion (180) of the sealing bead (18) is formed, and that concentric annular beads (30) and (31) are formed with a thickness t 'greater than the thickness Ec of the coextruded layer (22), above the sealing rings (28) and (29).
  • the sealing bead (18) thus has, in particular thanks to these movements of material, a strong adhesion at the same time between the support sheet (20) and the coextruded layer (22), and between the coextruded layer (22) and the range (12) of the pot or container (10), which leads to a high sealing tightness of the sealing bead (18), especially in the sealing regions corresponding to the marks S1 to S5 of the figure 2 .
  • the lidding foil (17) for example has a support layer (20) of 12 ⁇ m polyethylene terephthalate (PET) with a coextruded layer (22) with a basis weight of 30 g / m 2 and the pot or container (10) is made of polystyrene (PS).
  • the support sheet (20) can for example still be printed and be provided with a protective lacquer with a basis weight of 1 g / m 2 .
  • a lidding sheet (17) having the extruded layer (22 ') forming said sealing layer (38') is manufactured according to the figure 2 .
  • a lidding sheet (17) having the coextruded layer (22) according to figure 3 comprises three layers: an adhesive layer (34), an intermediate layer (36) and a sealing layer (38).
  • a lidding sheet (17) having the coextruded layer (22) is also manufactured according to the figure 4 .
  • This coextruded layer (22) comprises three layers: an adhesive layer 34 and a sealing layer 38.
  • a lidding sheet (17) has also been manufactured as schematically illustrated on the figure 5 a supply sheet (20) comprising an outer metallization layer (21) and an inner layer of a bonding primer (40) was provided and coextruded on said carrier sheet (20) (22) comprising an adhesive layer (34) for adhering to the primer layer (40), an intermediate layer (36) and a sealing layer (38).
  • said lidding foil (17) represented on the right side of the figure 5 .
  • the sealing foil (17) of the figure 6 In a similar way, the sealing foil (17) of the figure 6 .
  • the coextruded layer (22) - or the extruded layer (22 ') - has been assembled to a support sheet (20) comprising successively externally: a primer layer ( 39), an imprint (41) and an overprint varnish layer (42).
  • a lidding foil (17) has been obtained in the form of a coil, as illustrated in FIG. figure 7 .
  • a stack (17 ') of pre-cut lids (16') was also formed from the lidding foil (17) in a coil of the figure 7 .
  • the lids (16, 16 ') according to the invention can be sealed on pots with sealing beads (18) of variable depth, without affecting the sealing of the packaging (1) and the adhesion of the seal on the pot, which is very advantageous in practice because it increases the adjustment tolerances of sealing tools on industrial line, and thus greatly reduces the scrap rate and health risks related to leaks in packaging (1).
  • the invention makes it possible to obtain operculas (16, 16 ') or sealing foils (17) that are economical to manufacture insofar as one can have lids with a fraction of at least 50% of the thickness or at least 50% of the mass corresponds to an extruded (22 ') or coextruded layer (22) formed from granulated plastic material. This fraction can be much higher and reach 60, 70 or even 80%.
  • the invention makes it possible to obtain, from one and the same support sheet (20), a whole family of lids (16, 16 ') or lidding foil (17) by varying the composition of the extruded layer (22 ') or coextruded layer (22), so that it is easy to have a wide variety of covers, with various properties, as regards their weight, their "hand", their barrier properties , their adhesion and peel force or opening force, etc ....

Abstract

The invention concerns a package (1) comprising a container (10) provided with a surface (12) delimiting an opening (14), and an inner seal (16) sealed on the surface (129 and removable by peeling. The invention is characterized in that: a) the inner seal (16) comprises a support sheet (20) and an extruded (22') or co-extruded (22) plastic layer, forming or comprising a sealing layer (38', 38); b) said extruded (22') or co-extruded (22) layer is made of a material selected to adhere, through its outer surface, to said support sheet (20), and through its inner surface, to said surface (12) when sealed; c) said support sheet (20) is coated on its outer surface with a metal-plated film 21); d) and in that said extruded (22') or co-extruded (22) layer has a thickness Ec selected such that said peeling of the inner seal (16) brings about a coherent rupture of the extruded (22') or co-extruded (22) layer. The invention provides the advantage that said seals enable a broader selection of sealing techniques.

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

L'invention concerne le domaine des emballages comprenant des pots ou récipients en matière plastique contenant généralement des produits laitiers frais, typiquement des yaourts, obturés par des opercules.The invention relates to the field of packaging comprising pots or plastic containers generally containing fresh dairy products, typically yoghurt, sealed with lids.

ETAT DE LA TECHNIQUESTATE OF THE ART

Ces opercules sont formés en un matériau multicouche souple comprenant une couche de scellage et apte à être scellé, typiquement par thermoscellage, sur une plage de scellage d'un pot ou récipient en matière plastique, en vue de l'obturer. Cette plage de scellage délimite une ouverture de remplissage et de prélèvement, et les opercules, une fois thermoscellés sur la plage du pot, peuvent être séparés du pot par pelage.
Ces opercules peuvent soit former des opercules prédécoupés, soit constituer une feuille d'operculage.These covers are formed of a flexible multilayer material comprising a sealing layer and adapted to be sealed, typically by heat sealing, on a sealing pad of a pot or plastic container, in order to seal it. This sealing range defines a filling and sampling aperture, and the lids, once heat-sealed on the range of the pot, can be separated from the pot by peeling.
These lids may either form pre-cut lids or form a lidding leaf.

Généralement, pour un type d'emballage connu contenant des denrées alimentaires comme le yaourt et d'autres aliments à durée de conservation limitée, ceux-ci sont versés dans des pots ou récipients en matière plastique qui sont ensuite operculés avec un opercule en une feuille d'aluminium ou en une feuille composite papier/PET pelable de la plage du récipient. Les opercules se composent d'une couche de laque qui produit, lors du scellage à chaud des opercules, l'adhérence de l'opercule sur le récipient nécessaire pour une fermeture exempte de germes. Lors du pelage de l'opercule de la plage du récipient, la séparation se produit à l'interface entre l'agent de scellage et le substrat du récipient sous forme d'un pelage adhésif entre l'opercule laqué et la plage du récipient.Generally, for a known type of packaging containing foodstuffs such as yogurt and other foods with limited shelf life, they are poured into pots or plastic containers which are then sealed with a foil seal of aluminum or a laminated paper / PET composite sheet from the container's range. The covers consist of a layer of lacquer which produces, during heat sealing of the covers, the adhesion of the cap on the container necessary for a closure free of germs. When peeling the seal from the container's range, separation occurs at the interface between the sealant and the sealant. substrate of the container in the form of an adhesive peel between the lacquered operculum and the range of the container.

On connaît par exemple du document de brevet CA 1 336 878 des feuilles d'operculage correspondant au préambule de la revendication 1 annexée et destinées à obturer des plateaux rigides de grande dimension. Ces feuilles d'operculage présentent la structure suivante : couche de scellage en PP et PE / couche de promoteur d'adhésion / couche de matériau barrière, complétée éventuellement par une couche d'adhésif et une couche de protection. Ces feuilles ont une couche de scellage d'environ 12 µm et sont fabriquées par lamination collage de cette couche de scellage sur la couche de matériau barrière par l'intermédiaire du promoteur d'adhésion.For example, there is known patent document CA 1 336 878 lidding sheets corresponding to the preamble of claim 1 attached and intended to close rigid trays of large size. These lidding sheets have the following structure: sealing layer of PP and PE / adhesion promoter layer / layer of barrier material, optionally supplemented with an adhesive layer and a protective layer. These sheets have a sealing layer of about 12 μm and are manufactured by laminating this sealing layer to the barrier material layer via the adhesion promoter.

PROBLEMES POSESPROBLEMS POSED

Un inconvénient des opercules usuels aujourd'hui est qu'ils se déchirent souvent pendant le pelage lors de l'ouverture des emballages et qu'ils ne se détachent dès lors que partiellement de la plage. De plus, il existe un risque, si les conditions de scellage ne sont pas optimales, notamment dans les conditions industrielles de scellage, que l'adhérence à la surface limite entre la couche de scellage de l'opercule et le substrat de la plage de scellage soit tellement faible qu'il puisse se produire, déjà lors du transport, une séparation locale de l'opercule et de la plage du pot dans la région de scellage et ainsi une ouverture imprévue et dans certains cas même indétectable de l'emballage, de sorte que la durée de conservation du contenu ne soit plus garantie.
L'invention a pour objet de procurer des opercules, sous forme de feuilles d'operculages en bobine ou sous forme de piles d'opercules prédécoupés, qui ne présentent pas les inconvénients précités des opercules en feuille d'aluminium ou en matériau multicouche composite papier/PET utilisés actuellement et comprenant une couche de laque de scellage.
En outre, l'invention a pour objet des opercules économiques à fabriquer et conformes aux directives actuelles de respect de l'environnement pour les matériaux d'emballage.A disadvantage of the usual lids today is that they often tear during peeling when opening packages and they are detached as part of the beach. In addition, there is a risk, if the sealing conditions are not optimal, especially in the industrial sealing conditions, that the adhesion to the boundary surface between the seal layer of the seal and the substrate of the sealing range. sealing is so weak that it can occur, already during transport, a local separation of the lid and the range of the pot in the sealing region and thus an unplanned opening and in some cases even undetectable of the package, so that the shelf life of the content is no longer guaranteed.
The object of the invention is to provide lids, in the form of lidding sheets in a reel or in the form of pre-cut lidded stacks, which do not have the abovementioned disadvantages of lids made of aluminum foil or of paper composite multilayer material. / PET currently used and comprising a layer of sealing lacquer.
In addition, the invention relates to economical seals to manufacture and comply with current environmental guidelines for packaging materials.

DESCRIPTION DE L'INVENTIONDESCRIPTION OF THE INVENTION

Selon l'invention, l'emballage comprend un récipient en matière plastique doté d'une plage délimitant une ouverture de remplissage et de prélèvement, ledit récipient contenant un produit, typiquement un produit alimentaire, et un opercule d'une feuille souple d'operculage scellé par thermoscellage sur la plage du récipient à l'aide d'une couche de scellage et détachable de celui-ci par pelage, ledit opercule étant solidarisé à ladite plage dudit récipient par un cordon de scellage, la feuille d'operculage comprenant une feuille de support et une couche extrudée ou une couche coextrudée en matière plastique, ladite couche extrudée formant ladite couche de scellage, ladite couche coextrudée comprenant une couche formant ladite couche de scellage,
ladite couche extrudée ou coextrudée présentant une épaisseur Ec choisie de manière à ce que ledit pelage de l'opercule entraîne une rupture cohésive de la couche extrudée ou coextrudée, l'emballage étant caractérisé en ce que ladite couche extrudée ou coextrudée est formée en un matériau choisi de manière à adhérer, par sa face extérieure, à ladite feuille de support, et par sa face intérieure, à ladite plage durant ledit thermoscellage, et ladite feuille de support est recouverte sur sa face extérieure, par une couche de métallisation.According to the invention, the package comprises a plastic container having a range defining a filling and sampling aperture, said container containing a product, typically a food product, and a lid of a flexible sealing foil sealed by heat-sealing on the container surface by means of a sealing layer and detachable from it by peeling, said seal being secured to said range of said container by a sealing bead, the lidding sheet comprising a support sheet and an extruded layer or a coextruded layer of plastic material, said extruded layer forming said sealing layer, said coextruded layer comprising a layer forming said sealing layer,
said extruded or coextruded layer having a thickness Ec chosen so that said peeling of the lid causes a cohesive rupture of the extruded or coextruded layer, the package being characterized in that said extruded or coextruded layer is formed of a material chosen so as to adhere, by its outer face, to said support sheet, and by its inner face, to said range during said heat-sealing, and said support sheet is covered on its outer face by a metallization layer.

L'invention concerne également un opercule destiné à être scellé sur cet emballage, et un procédé de fabrication de la feuille d'operculage. Les opercules selon l'invention résolvent les problèmes posés. En effet, d'une part, la demanderesse a eu la surprise de constater qu'il était possible d'avoir une couche extrudée assurant la fonction de couche de scellage, et contribuant de manière importante à l'épaisseur de l'opercule, ainsi qu'à sa tenue ou à sa "main", c'est-à-dire à l'impression ressentie par le consommateur lors de la préhension manuelle du rebord de l'opercule en vue l'ouverture de l'emballage obturé. D'autre part, elle a pu observer à la fois la facilité d'ouverture par pelage de l'opercule et la stabilité de la force de pelage, sans doute grâce à la rupture cohésive de la couche extrudée ou coextrudée, ainsi que la relative grande latitude ou tolérance des conditions d'operculage, ce qui est très important dans la pratique. En effet, elle a pu observer que les opercules selon l'invention, sans doute grâce à une épaisseur de couche extrudée relativement grande, assuraient à la fois, une grande stabilité de la force de pelage et surtout une faible sensibilité de l'étanchéité finale des récipients aux conditions de thermoscellage. En effet, notamment dans le cas où les opercules forment une feuille d'opercules de grande largeur, typiquement supérieure à 300 mm, il peut y avoir des différences locales de pression des mors de thermoscellage, dans le sens de la largeur de la feuille d'operculage. Ainsi, il est apparu que la qualité de scellage de la couche extrudée ou coextrudée était indépendante de la profondeur de la rainure annulaire formée par la pression exercée par un outil de scellage lors du thermoscellage.The invention also relates to a seal intended to be sealed on this packaging, and a method of manufacturing the sealing foil. The covers according to the invention solve the problems posed. Indeed, on the one hand, the applicant was surprised to find that it was possible to have an extruded layer providing the sealing layer function, and contributing significantly to the thickness of the lid, and that to his holding or his "hand", that is to say the impression felt by the consumer during the manual gripping of the edge of the lid for the opening of the sealed package. On the other hand, it has been able to observe both the ease of opening by peeling of the lid and the stability of the peel force, probably due to the cohesive rupture of the extruded or coextruded layer, as well as the relative wide latitude or tolerance of sealing conditions, which is very important in practice. Indeed, she was able to observe that the lids according to the invention, probably due to a relatively large extruded layer thickness, ensured both a high stability of the peel force and especially a low sensitivity of the final seal. containers to the heat sealing conditions. Indeed, especially in the case where the covers form a sheet of operculum of large width, typically greater than 300 mm, there may be local differences in pressure of the heat sealing jaws, in the direction of the width of the foil. lidding. Thus, it appeared that the sealing quality of the extruded or coextruded layer was independent of the depth of the annular groove formed by the pressure exerted by a sealing tool during heat sealing.

Par ailleurs, ces opercules sont de fabrication économique compte tenu du fait qu'une part importante de l'opercule est constituée par une couche extrudée ou coextrudée, de sorte qu'au moins la majeure partie de l'opercule est une couche extrudée ou coextrudée formée à partir d'une matière thermoplastique sous la forme la moins élaborée qui soit, à savoir sous forme de granulés.Moreover, these covers are of economical manufacture taking into account that a large part of the lid is constituted by an extruded or coextruded layer, so that at least the major part of the lid is an extruded or coextruded layer formed from a thermoplastic material in the least elaborate form that is, namely in the form of granules.

Par "rupture cohésive de la couche extrudée ou coextrudée", on entend que, lors de l'enlèvement par pelage d'un opercule fabriqué avec la feuille d'opercule conforme à l'invention et scellé contre la plage de l'ouverture d'un récipient ou contenant en matière plastique, la séparation des matières se produit a l'intérieur de la couche extrudée ou coextrudée, une partie de la couche extrudée restant sur la plage de scellage du récipient et une autre partie sur la feuille de support de l'opercule.By "cohesive rupture of the extruded or coextruded layer" is meant that, during the peel removal of a lid made with the foil of the invention according to the invention and sealed against the range of the opening of a plastic container or container, material separation occurs within the extruded or coextruded layer, with a portion of the extruded layer remaining on the sealing range of the container and another portion on the carrier sheet of the container; operculum.

La structure de la couche extrudée ou coextrudée est choisie en fonction de la matière plastique utilisée pour la feuille de support et de la matière du récipient. En effet, l'adhérence entre la feuille de support et la couche extrudée ou coextrudée d'une part, et entre la couche extrudée ou coextrudée et le récipient d'autre part après le scellage de l'opercule sur la plage du récipient, doit être plus grande au moins dans les parties de la région de scellage déterminantes pour l'étanchéité du scellage que l'adhérence cohésive à l'intérieur de la couche extrudée ou coextrudée, de manière à avoir une rupture cohésive de la couche extrudée. En outre, la structure en couches de la couche extrudée ou coextrudée est choisie en fonction des propriétés désirées pour l'opercule.The structure of the extruded or coextruded layer is chosen depending on the plastic material used for the carrier sheet and the container material. Indeed, the adhesion between the support sheet and the extruded or coextruded layer on the one hand, and between the extruded or coextruded layer and the container on the other hand after the sealing of the lid on the range of the container, must at least in those portions of the sealing region which are critical for seal sealing, to be larger than the cohesive adhesion within the extruded or coextruded layer, so as to have cohesive failure of the extruded layer. In addition, the layered structure of the extruded or coextruded layer is selected depending on the properties desired for the seal.

DESCRIPTION DES FIGURESDESCRIPTION OF THE FIGURES

La figure 1 est une vue en perspective d'une pluralité d'emballages (1) comprenant quatre contenants ou récipients (10) en matière plastique obturés par des opercules (16) scellés et formés en une feuille d'operculage (17). Sur un des récipients (10), en bas à gauche, le pelage d'un opercule (16) a été amorcé en tirant manuellement sur un coin de l'opercule ou patte d'arrachement (19). Sur un autre des récipients (10), en bas à droite, l'opercule (16) a été enlevé partiellement sur une partie du récipient (10) où la trace de scellage (183) du cordon de scellage (18) a été représentée, l'opercule (16) étant présent sur l'autre partie où le cordon de scellage (18) a été représenté.The figure 1 is a perspective view of a plurality of packages (1) comprising four containers or containers (10) made of plastic material sealed with lids (16) sealed and formed into a lidding sheet (17). On one of the containers (10), in the lower left, the peeling of a lid (16) was initiated by manually pulling on a corner of the cover or tear-off tab (19). On another of the containers (10), bottom right, the seal (16) has been partially removed on a portion of the container (10) where the sealing trace (183) of the sealing bead (18) has been shown , the seal (16) being present on the other part where the sealing bead (18) has been shown.

La figure 2 montre, en vue agrandie et dans un plan vertical I-I perpendiculaire au plan de l'opercule, une coupe du cordon de scellage (18) d'un emballage (1) de la Fig. 1, comprenant un opercule (16) constitué d'une feuille support (20) et d'une couche extrudée (22') formant ladite couche de scellage (38') ou d'une couche coextrudée (22) comprenant ladite couche de scellage (38), les couches de ladite couche coextrudée (22) n'ayant pas été réprésentées distinctes les unes des autres.The figure 2 shows, in enlarged view and in a vertical plane II perpendicular to the plane of the lid, a section of the sealing cord (18) of a package (1) of the Fig. 1 , comprising a cover (16) consisting of a carrier sheet (20) and an extruded layer (22 ') forming said sealing layer (38') or a coextruded layer (22) comprising said sealing layer ( 38), the layers of said coextruded layer (22) having not been shown to be distinct from each other.

La Fig. 3 représente une coupe transversale d'une modalité d'une couche coextrudée (22) comprenant trois couches (34), (36) et (38), alors que la figure 4 représente une coupe transversale d'une autre modalité de couche coextrudée comprenant deux couches (34) et (38). Afin de ne pas surcharger la figure, la couche (36) n'a pas été hachurée.The Fig. 3 represents a cross section of a modality of a coextruded layer (22) comprising three layers (34), (36) and (38), while the figure 4 represents a cross section of another coextruded layer modality comprising two layers (34) and (38). In order not to overload the figure, the layer (36) has not been hatched.

La figure 5 illustre schématiquement en coupe transversale analogue à celle de la figure 3, la fabrication d'une feuille d'operculage (17) par approvisionnement d'une feuille de support (20) et co-extrusion d'une couche (22).
Sur cette figure, les couches (21) et (40) n'ont pas été hachurées.The figure 5 illustrates schematically in cross-section similar to that of the figure 3 manufacturing a lidding sheet (17) by supplying a carrier sheet (20) and coextruding a layer (22).
In this figure, the layers (21) and (40) have not been hatched.

La figure 6, analogue à la partie droite de là figure 5, représente une modalité de feuille d'operculage (17) dans laquelle la couche co-extrudée (22) est assemblée à une feuille de support (20) comprenant extérieurement successivement : une couche de primaire d'accrochage (39), une impression (41) et une couche de vernis de sur-impression (42). Sur cette figure, les couches (39), (40) et (42) n'ont pas été hachurées.The figure 6 , analogous to the right part of there figure 5 , represents a sealing sheet modality (17) in which the coextruded layer (22) is assembled to a support sheet (20) comprising successively externally: a primer layer (39), an imprint ( 41) and an overprint varnish layer (42). In this figure, the layers (39), (40) and (42) have not been hatched.

La figure 7 est une vue en perspective d'une bobine de feuille d'operculage (17).The figure 7 is a perspective view of a lidding sheet reel (17).

La figure 8 représente, à sa partie haute, une vue en coupe transversale d'une pile (17') d'opercules prédécoupés (16'), et à sa partie basse, une vue de dessus d'un opercule prédécoupé (16') imprimé.The figure 8 is at its upper part, a cross-sectional view of a stack (17 ') of pre-cut lids (16'), and at its lower part, a top view of a pre-cut seal (16 ') printed.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

Selon l'invention, la feuille de support (20) peut être une feuille de matière plastique. Par "feuille de support", on entend ici la feuille qui est revêtue sur une face avec la couche extrudée (22') coextrudée (22). Cependant, la feuille de support, quoique de préférence composée de matière plastique, peut aussi comprendre une feuille de papier et/ou d'aluminium. Ainsi, d'autres couches de matière plastique, d'aluminium ou de papier, éventuellement imprimées et pourvues d'une laque de protection, peuvent être disposées sur l'autre face de ladite feuille de support (20).According to the invention, the support sheet (20) can be a plastic sheet. By "carrier sheet" is meant here the sheet which is coated on one side with the coextruded extruded layer (22 ') (22). However, the carrier sheet, although preferably made of plastic material, may also comprise a sheet of paper and / or aluminum. Thus, other layers of plastic, aluminum or paper, possibly printed and provided with a protective lacquer, may be disposed on the other side of said support sheet (20).

Ladite feuille de matière plastique peut être en une matière plastique choisie parmi : un polyester, en particulier le polyéthylène de téréphtalate (PET), une polyoléfine, en particulier un polypropylène (PP), un polyamide (PA) ou un copolymère cyclo-oléfinique (COC).Said plastic sheet may be made of a plastic material chosen from: a polyester, in particular polyethylene terephthalate (PET), a polyolefin, in particular a polypropylene (PP), a polyamide (PA) or a cycloolefinic copolymer ( COC).

Ladite feuille de support (20) est recouverte sur une de ses faces intérieure ou extérieure, par une couche de métallisation (21).Said support sheet (20) is covered on one of its inner or outer faces by a metallization layer (21).

Typiquement, ladite couche de métallisation (21) peut recouvrir ladite face extérieure de ladite feuille de support (20), comme représenté sur la figure 5.
Ladite feuille de support (20) peut être obtenue soit à partir d'un film en ladite matière plastique approvisionné en bobine, soit éventuellement par une seconde extrusion ou coextrusion à partir de ladite matière plastique approvisionnée sous forme de granulés. Quelle que soit la modalité d'obtention de ladite feuille de support, ladite feuille de support et/ou ladite couche de métallisation peut comprendre, sur au moins une de ses faces, une couche d'un primaire d'accrochage (39, 40).Typically, said metallization layer (21) may cover said outer face of said support sheet (20), as shown in FIG. figure 5 .
Said support sheet (20) can be obtained either from a film of said plastic material supplied in a reel, or possibly by a second extrusion or coextrusion from said plastic material supplied in the form of granules. Whatever the method of obtaining said support sheet, said support sheet and / or said metallization layer may comprise, on at least one of its faces, a layer of a primer (39, 40). .

L'épaisseur de la feuille de support (20) se situe en général entre environ 7 et 200 µm et dépend de la grandeur et du poids du contenu du récipient à fermer.The thickness of the carrier sheet (20) is generally between about 7 and 200 μm and depends on the size and weight of the contents of the container to be closed.

Selon l'invention, ladite couche extrudée (22') ou coextrudée (22) peut présenter une épaisseur Ec allant de 5 µm à 80 µm, et typiquement de 15 µm à 60 µm.
Selon le type d'opercule, ladite couche extrudée (22') ou coextrudée (22) peut présenter une épaisseur Ec allant de 25µm à 40 µm, et typiquement une épaisseur allant de 30 µm à 35 µm.According to the invention, said extruded (22 ') or coextruded layer (22) may have a thickness Ec ranging from 5 μm to 80 μm, and typically from 15 μm to 60 μm.
Depending on the type of cap, said extruded (22 ') or coextruded layer (22) may have a thickness Ec ranging from 25 .mu.m to 40 .mu.m, and typically a thickness ranging from 30 .mu.m to 35 .mu.m.

Comme illustré sur la figure 3, la couche coextrudée (22) peut comprendre trois couches et présenter une couche d'adhésif (34) assemblée à la feuille de support (26), une couche intermédiaire (36) et une couche de scellage (38) assemblée à la plage (12) du récipient (10).
Cependant, comme illustré sur la figure 2, la couche coextrudée (22) peut comprendre deux couches et présenter une couche d'adhésif (34) assemblée à la feuille de support (20) et une couche de scellage (38) assemblé à la plage (12) du récipient (10).As illustrated on the figure 3 the coextruded layer (22) may comprise three layers and have an adhesive layer (34) joined to the backing sheet (26), an intermediate layer (36) and a sealing layer (38) joined to the beach ( 12) of the container (10).
However, as shown on the figure 2 the coextruded layer (22) may comprise two layers and have an adhesive layer (34) joined to the carrier sheet (20) and a sealing layer (38) joined to the range (12) of the container (10) .

La couche d'adhésif (34) peut contenir au moins un des composants suivants: copolymères et/ou copolymères greffés et/ou terpolymères comprenant des groupements acides ou des ionomères, PE métallocène, PE linéaire, copolymères d'EVA, copolymères d'EMA, copolymères d'EEA, copolymères d'EBA, des mélanges de ces composants ou d'une polyoléfine avec une résine tackifiante.
Ladite couche d'adhésif (34) peut présenter une épaisseur allant de 2 µm à 10 µm.
Ladite couche de scellage (38) peut contenir au moins un des composants suivants : copolymère d'éthylène et d'acétate de vinyle (EVA), copolymère d'éthylène et d'acrylate de méthyle (EMA), copolymère d'éthylène et d'acrylate de butyle (EBA), copolymère d'éthylène et d'acrylate d'éthyle (EEA), des terpolymères avec des monomères d'α-oléfines comprenant des esters.
Ladite couche de scellage peut comprendre au moins un desdits composants et au moins une résine tackifiante.The adhesive layer (34) may contain at least one of the following components: graft copolymers and / or copolymers and / or terpolymers comprising acid groups or ionomers, metallocene PE, linear PE, EVA copolymers, EMA copolymers , copolymers of EEA, copolymers of EBA, mixtures of these components or a polyolefin with a tackifying resin.
Said adhesive layer (34) can have a thickness ranging from 2 microns to 10 microns.
Said sealing layer (38) can contain at least one of the following components: copolymer of ethylene and vinyl acetate (EVA), copolymer of ethylene and methyl acrylate (EMA), copolymer of ethylene and butyl acrylate (EBA), copolymer of ethylene and ethyl acrylate (EEA), terpolymers with α-olefin monomers comprising esters.
Said sealing layer may comprise at least one of said components and at least one tackifying resin.

Ladite couche de scellage peut présenter une épaisseur allant de 5 µm à 70 µm, et typiquement de 10 µm à 30 µm.
Ladite couche intermédiaire (36) peut contenir au moins un des composants suivants : polyamide (PA), polymère et copolymère de cyclo-oléfine (COC), homo- et copolymères de polyoléfines avec ou sans charges minérales ou organiques. La couche intermédiaire (36) peut comprendre une charge minérale telle que, par exemple, du talc, à une teneur pondérale allant typiquement de 5 % à 30 %, de manière à favoriser la rupture cohésive de ladite couche intermédiaire lors de l'ouverture dudit emballage.
De même, ladite couche de scellage (38, 38') peut comprendre une charge minérale ou organique, par exemple, du talc, à une teneur pondérale allant typiquement de 5 % à %, de manière à favoriser la rupture cohésive de ladite couche de scellage lors de l'ouverture dudit emballage.
Ladite couche intermédiaire (36) peut présenter une épaisseur allant de 2 µm à 40 µm.Said sealing layer may have a thickness ranging from 5 μm to 70 μm, and typically from 10 μm to 30 μm.
Said intermediate layer (36) may contain at least one of the following components: polyamide (PA), polymer and copolymer of cycloolefin (COC), homo- and copolymers of polyolefins with or without mineral or organic fillers. The intermediate layer (36) may comprise a mineral filler such as, for example, talc, at a weight content typically ranging from 5% to 30%, so as to promote the cohesive failure of said intermediate layer during the opening of said packaging.
Likewise, said sealing layer (38, 38 ') may comprise an inorganic or organic filler, for example talc, at a weight content typically ranging from 5% to%, so as to promote the cohesive failure of said coating layer. sealing when opening said package.
Said intermediate layer (36) may have a thickness ranging from 2 microns to 40 microns.

Selon l'invention, le récipient (10) peut être en un matériau choisi parmi : un polystyrène (PS), un polyester (PET), une polyoléfine, en particulier le polyéthylène (PE) ou le polypropylène (PP), le polymère de chlore de vinyle (PVC).According to the invention, the container (10) can be made of a material chosen from: a polystyrene (PS), a polyester (PET), a polyolefin, in particular polyethylene (PE) or polypropylene (PP), the polymer of vinyl chlorine (PVC).

Ledit opercule (16) est typiquement un opercule imprimé, un motif imprimé (41) pouvant être formé sur une face externe de ladite feuille support (20) ou de ladite couche de métallisation (21) ou de ladite couche primaire d'accrochage (39).
Dans ce cas, un vernis de sur-impression (42) peut recouvrir ledit motif imprimé (41).Said cover (16) is typically a printed cover, a printed pattern (41) that can be formed on an outer face of said support sheet (20) or said metallization layer (21) or said primary attachment layer (39). ).
In this case, an overprint varnish (42) may cover said printed pattern (41).

Ladite feuille d'opercule (17) dudit opercule (16) peut présenter une épaisseur allant de 10 µm à 90 µm, ladite feuille de support (20) présentant une épaisseur Es et ladite couche coextrudée (22) présentant une épaisseur Ec telle que le rapport Ec/Es soit au moins égal à 1, et soit typiquement compris entre 2 et 4.Said operculum sheet (17) of said seal (16) may have a thickness ranging from 10 μm to 90 μm, said support sheet (20) having a thickness Es and said coextruded layer (22) having a thickness Ec such that the Ec / Es ratio is at least 1, and is typically between 2 and 4.

Comme illustré sur la figure 2, ledit cordon de scellage (18), formé lors dudit thermoscellage par un outil de scellage (24), peut comprendre une partie centrale annulaire affaissée (180) bordée par deux bourrelets périphériques (181, 182), un bourrelet intérieur (181) et un bourrelet extérieur (182), lesdits bourrelets périphériques (181, 182) comprenant une sur-épaisseur t' de ladite couche coextrudée (22), ladite sur-épaisseur étant au moins égale à 1,5.Ec.As illustrated on the figure 2 said sealing bead (18), formed during said heat sealing by a sealing tool (24), may comprise a collapsed annular central portion (180) bordered by two peripheral beads (181, 182), a inner bead (181) and an outer bead (182), said peripheral bead (181, 182) comprising an over-thickness t 'of said coextruded layer (22), said over-thickness being at least 1.5. .

Un autre objet de l'invention est constitué par un opercule (16) destiné à obtenir, par thermocellage sur ledit récipient (10), ledit emballage (1) selon l'invention, ledit opercule (16) étant une partie de ladite feuille d'operculage (17) ou un opercule prédécoupé (16') d'une pile (17') d'opercules prédécoupés dans ladite feuille d'operculage (17).Another object of the invention is constituted by a lid (16) intended to obtain, by heat-sealing on said container (10), said package (1) according to the invention, said lid (16) being a part of said foil lidding (17) or a pre-cut lid (16 ') of a stack (17') of pre-cut lids in said lidding foil (17).

EXEMPLES DE REALISATIONEXAMPLES OF REALIZATION

Les figures 1 à 8 illustrent des exemples de réalisation de l'invention.The Figures 1 to 8 illustrate exemplary embodiments of the invention.

On a fabriqué des emballages (1) selon la figure 1.
La Fig. 1 montre une disposition avec quatre pots ou récipients en matière plastique (10) pour l'emballage de produits frais, par exemple de yaourt. Dans l'exemple illustré, quatre pots (10) sont assemblés les uns aux autres. Chaque pot (10) présente une plage de scellage (12) entourant une ouverture (14) recouverte par un opercule (16) d'une feuille d'operculage (17). La feuille d'opercule 17 est scellée sur la plage de scellage (12) selon un cordon de scellage (18), cordon (18) qui n'a été représenté qu'en bas et à droite de la figure 1.
Le pelage de l'opercule (16), comme illustré en bas et à gauche de la figure 1 par une flèche (44) symbolisant un effort manuel de pelage, donne accès à l'ouverture (14) du pot et permet de prélever tout ou partie du contenu du pot.
Les pots individuels (10) sont assemblés par la plage de scellage (12) en formant une pluralité de pots obturés, après remplissage, par une feuille d'operculage (17) formant une pluralité d'opercules (16). Pour séparer les pots (10), il est prévu des arêtes de bord communes, qui peuvent être aisément séparées à la main le long de lignes d'affaiblissement marquées ou coupées dans la plage de scellage (12). En recouvrement de ces lignes d'affaiblissement, la feuille d'operculage (17) est également découpée en opercules individuels (16), de sorte chaque opercule (16) peut être enlevé individuellement. Chaque opercule (16) est ainsi appliqué librement sur la plage de scellage (12) du pot (10) et scellé selon le cordon de scellage (18), de sorte qu'à l'extérieur de ce cordon de scellage (18), l'emballage (1) comprend une patte d'arrachement 19 à chacun des quatre coins de la plage de scellage (12) de chaque pot (10).Packaging (1) has been manufactured according to the figure 1 .
The Fig. 1 shows a provision with four pots or plastic containers (10) for packaging fresh products, for example yoghurt. In the illustrated example, four pots (10) are assembled to each other. Each pot (10) has a sealing pad (12) surrounding an opening (14) covered by a lid (16) of a lidding foil (17). The operculum sheet 17 is sealed on the sealing pad (12) according to a sealing cord (18), cord (18) which has been shown in the bottom right of the figure 1 .
Peeling of the operculum (16), as illustrated at the bottom left of the figure 1 by an arrow (44) symbolizing a manual effort of peeling, gives access to the opening (14) of the pot and allows to take all or part of the contents of the pot.
The individual pots (10) are assembled by the sealing pad (12) forming a plurality of closed pots, after filling, by a sealing sheet (17) forming a plurality of lids (16). To separate the pots (10), common edge edges are provided, which can be easily separated by hand along marked or cut lines of weakness in the sealing range (12). In recovery of these weakening lines, the lidding foil (17) is also cut into individual lids (16), so that each lid (16) can be removed individually. Each cap (16) is thus freely applied to the sealing surface (12) of the pot (10) and sealed along the sealing bead (18), so that outside this sealing bead (18), the package (1) comprises a tear tab 19 at each of the four corners of the sealing range (12) of each pot (10).

La Fig. 2 montre les déplacements ou fluage de matière qui se produisent lors du scellage de la feuille d'operculage (17) ou de l'opercule (16) sur la plage de scellage (12) du pot (10) de la figure 1. Sur cette même figure a été également représenté le tracé de la déchirure - notée de S1 à S5 - à travers le cordon de scellage (18) lors du pelage de l'opercule (16) quand s'exerce un effort manuel de pelage (44) sur un coin de l'opercule pour le séparer de la plage de scellage (12).
Compte tenu de la température élevée de l'outil de scellage (24) appliqué sur la feuille d'operculage (17) et sur la plage de scellage, (12) du pot (10) sous-jacent, outil comprenant typiquement un mors de scellage comme indiqué en traits interrompus dans la figure 2, les matières se ramollissent dans la zone de scellage, et la pression exercée par l'outil de scellage (24) sur l'opercule (16) conduit à la formation d'un cordon de scellage (18) ayant, dans le cas des pots de la figure 1 et dans le plan de l'opercule (16), la forme d'un carré à coins arrondis.
En coupe transversale, le cordon de scellage (18) comprend une partie centrale annulaire affaissée (180) bordée par deux bourrelets périphériques (181, 182), un bourrelet intérieur (181) et un bourrelet extérieur (182), lesdits bourrelets périphériques (181, 182) comprenant une sur-épaisseur t' de ladite couche coextrudée (22), ladite sur-épaisseur étant au moins égale à 1,5.Ec.
En ce qui concerne la plage de scellage (12) du pot (10), elle comprend une rainure annulaire (26), de profondeur t, correspondant à la partie centrale annulaire affaissée (180), et deux anneaux de scellage (28) et (29) correspondants aux bourrelets périphériques (181) et (182) du cordon de scellage (18). En effet, la matière refoulée par la formation de la rainure (26) conduit donc à la formation d'anneaux de scellage (28) et (29) de part et d'autre de la rainure (26). En faisant varier les conditions de scellage, on peut faire varier la profondeur t des anneaux de scellage (28) et (29), qui peut aller typiquement de 0,1 mm à 1 mm, tout en conservant l'étanchéité du scellage.
En ce qui concerne la feuille d'operculage (17) ou l'opercule (16), sous la pression de l'outil de scellage (24), la couche coextrudée (22) est refoulée en grande partie hors de la rainure (26) dans la plage de scellage (12) du pot (10), de sorte qu'il se forme une partie centrale annulaire amincie (32) correspondant sensiblement à ladite partie centrale annulaire affaissée (180) du cordon de scellage (18), et qu'il se forme des bourrelets annulaires concentriques (30) et (31) d'épaisseur t' supérieure à l'épaisseur Ec de la couche coextrudée (22), au-dessus des anneaux de scellage (28) et (29).
Le cordon de scellage (18) présente ainsi, notamment grâce à ces déplacements de matière, une forte adhérence à la fois entre la feuille de support (20) et la couche coextrudée (22), et entre la couche coextrudée (22) et la plage (12) du pot ou récipient (10), ce qui conduit à une haute étanchéité du cordon de scellage (18), notamment dans les régions de scellage correspondant aux repères S1 à S5 de la figure 2.The Fig. 2 shows the displacements or creep of material that occur during the sealing of the lidding foil (17) or the lid (16) on the sealing range (12) of the pot (10) of the figure 1 . In this same figure has also been shown the course of the tear - noted S1 to S5 - through the sealing bead (18) during peeling of the cover (16) when exerted a manual effort of peeling (44). ) on a corner of the lid to separate it from the sealing range (12).
Given the high temperature of the sealing tool (24) applied to the sealing foil (17) and the sealing range, (12) of the underlying pot (10), typically comprising a jaw of sealing as shown in dashed lines in the figure 2 , the materials soften in the sealing zone, and the pressure exerted by the sealing tool (24) on the seal (16) leads to the formation of a sealing bead (18) having, in the case of pots of the figure 1 and in the plane of the operculum (16), the shape of a square with rounded corners.
In cross-section, the sealing bead (18) comprises a collapsed annular central portion (180) bordered by two peripheral beads (181, 182), an inner bead (181) and an outer bead (182), said peripheral bead (181). , 182) comprising an over-thickness t 'of said coextruded layer (22), said over-thickness being at least 1.5.Ec.
As regards the sealing range (12) of the pot (10), it comprises an annular groove (26), of depth t, corresponding to the annular central annular portion (180), and two sealing rings (28) and (29) corresponding to peripheral beads (181) and (182) of the sealing bead (18). Indeed, the material discharged by the formation of the groove (26) thus leads to the formation of sealing rings (28) and (29) on either side of the groove (26). By varying the sealing conditions, it is possible to vary the depth t of the sealing rings 28 and 29, which can typically range from 0.1 mm to 1 mm, while maintaining the tightness of the seal.
With regard to the sealing foil (17) or the seal (16), under the pressure of the sealing tool (24), the coextruded layer (22) is discharged largely out of the groove (26). ) in the sealing range (12) of the pot (10), so that a thin annular central portion (32) substantially corresponding to said collapsed annular central portion (180) of the sealing bead (18) is formed, and that concentric annular beads (30) and (31) are formed with a thickness t 'greater than the thickness Ec of the coextruded layer (22), above the sealing rings (28) and (29).
The sealing bead (18) thus has, in particular thanks to these movements of material, a strong adhesion at the same time between the support sheet (20) and the coextruded layer (22), and between the coextruded layer (22) and the range (12) of the pot or container (10), which leads to a high sealing tightness of the sealing bead (18), especially in the sealing regions corresponding to the marks S1 to S5 of the figure 2 .

Lors du pelage de la feuille d'operculage (17) ou de l'opercule (16) par un effort manuel (44) tendant à séparer l'opercule de la plage de scellage (12) du pot (10) dé la figure 1, il apparaît une déchirure (33) d'abord dans la région S1 dans la couche coextrudée (22), typiquement dans la couche de scellage (38), déchirure qui se propage alors, de la région S1 à la région S5, jusqu'à la séparation complète de l'opercule (16), sous la forme d'une rupture cohésive.
En effet, les caractéristiques mécaniques de la feuille de support (20), notamment la dureté des matériaux, sont supérieures à celles de la couche coextrudée (22), de sorte que la déchirure (33) se propage dans l'épaisseur de la couche coextrudée (22).
Dans l'exemple représenté, la feuille d'operculage (17) présente par exemple une couche de support (20) de 12 µm en polyéthylène téréphtalate (PET) avec une couche coextrudée (22) avec un grammage de 30 g/m2 et le pot ou récipient (10) se compose de polystyrène (PS). La feuille de support (20) peut par exemple encore être imprimée et être pourvue d'une laque de protection avec un grammage de 1 g/m2.During the peeling of the sealing foil (17) or the lid (16) by a manual force (44) tending to separate the seal from the sealing range (12) of the pot (10) of the figure 1 there is a tear (33) first in the region S1 in the coextruded layer (22), typically in the sealing layer (38), which then propagates from the region S1 to the region S5, until at the complete separation of the lid (16), in the form of a cohesive rupture.
Indeed, the mechanical characteristics of the support sheet (20), in particular the hardness of the materials, are greater than those of the coextruded layer (22), so that the tear (33) propagates in the thickness of the layer coextruded (22).
In the example shown, the lidding foil (17) for example has a support layer (20) of 12 μm polyethylene terephthalate (PET) with a coextruded layer (22) with a basis weight of 30 g / m 2 and the pot or container (10) is made of polystyrene (PS). The support sheet (20) can for example still be printed and be provided with a protective lacquer with a basis weight of 1 g / m 2 .

Pour former l'emballage (1), on a fabriqué une feuille d'operculage (17) comprenant la couche extrudée (22') formant ladite couche de scellage (38') selon la figure 2.
Pour former l'emballage (1), on a également fabriqué une feuille d'operculage (17) comprenant la couche coextrudée (22) selon la figure 3. Cette couche coextrudée (22) comprend trois couches : une couche adhésive (34), une couche intermédiaire (36) et une couche de scellage (38).
On a aussi fabriqué une feuille d'operculage (17) comprenant la couche coextrudée (22) selon la figure 4. Cette couche coextrudée (22) comprend trois couches : une couche adhésive 34 et une couche de scellage 38.For forming the package (1), a lidding sheet (17) having the extruded layer (22 ') forming said sealing layer (38') is manufactured according to the figure 2 .
To form the package (1), a lidding sheet (17) having the coextruded layer (22) according to figure 3 . This coextruded layer (22) comprises three layers: an adhesive layer (34), an intermediate layer (36) and a sealing layer (38).
A lidding sheet (17) having the coextruded layer (22) is also manufactured according to the figure 4 . This coextruded layer (22) comprises three layers: an adhesive layer 34 and a sealing layer 38.

On a aussi fabriqué une feuille d'operculage (17) comme illustré schématiquement sur la figure 5 : on a approvisionné une feuille de support (20) comprenant une couche extérieure de métallisation (21) et une couche intérieure d'un primaire d'accrochage (40) et on a co-extrudé sur cette feuille de support (20) une couche (22) comprenant une couche d'adhésif (34) destinée à adhérer à la couche de primaire d'accrochage (40), une couche intermédiaire (36) et une couche de scellage (38). On a ainsi obtenu ladite feuille d'operculage (17) représentée sur la partie droite de la figure 5.A lidding sheet (17) has also been manufactured as schematically illustrated on the figure 5 a supply sheet (20) comprising an outer metallization layer (21) and an inner layer of a bonding primer (40) was provided and coextruded on said carrier sheet (20) (22) comprising an adhesive layer (34) for adhering to the primer layer (40), an intermediate layer (36) and a sealing layer (38). Thus, said lidding foil (17) represented on the right side of the figure 5 .

D'une manière analogue, on a fabriqué la feuille d'operculage (17) de la figure 6. Dans cette modalité de feuille (17), la couche co-extrudée (22) - ou la couche extrudée (22') - a été assemblée à une feuille de support (20) comprenant extérieurement successivement : une couche de primaire d'accrochage (39), une impression (41) et une couche de vernis de sur-impression (42).
Quelle que soit la modalité de feuille d'operculage (17), on a obtenu une feuille d'operculage (17) sous forme d'une bobine, comme illustré sur la figure 7.
On a aussi formé une pile (17') d'opercules prédécoupés (16') à partir de la feuille d'operculage (17) en bobine de la figure 7.In a similar way, the sealing foil (17) of the figure 6 . In this sheet modality (17), the coextruded layer (22) - or the extruded layer (22 ') - has been assembled to a support sheet (20) comprising successively externally: a primer layer ( 39), an imprint (41) and an overprint varnish layer (42).
Whatever the type of lidding foil (17), a lidding foil (17) has been obtained in the form of a coil, as illustrated in FIG. figure 7 .
A stack (17 ') of pre-cut lids (16') was also formed from the lidding foil (17) in a coil of the figure 7 .

AVANTAGES DE L'INVENTIONADVANTAGES OF THE INVENTION

L'invention présente de grands avantages.
En effet, d'une part, les opercules (16, 16') selon l'invention peuvent être scellés sur des pots avec des cordons de scellage (18) de profondeur variable, sans que cela nuise à l'étanchéité de l'emballage (1) et à l'adhérence de l'opercule sur le pot, ce qui est très avantageux dans la pratique car cela augmente les tolérances de réglage des outils de scellage sur ligne industrielle, et cela diminue donc considérablement le taux de rebut et les risques sanitaires liés à un défaut d'étanchéité des emballages (1).
D'autre part, l'invention permet d'obtenir des opercules (16, 16') ou des feuilles d'operculage (17) économiques à fabriquer dans la mesure où l'on peut avoir des opercules dont une fraction d'au moins de 50% de l'épaisseur ou d'au moins 50% de la masse correspond à une couche extrudée (22') ou co-extrudée (22) formée à partir de matière plastique en granulés. Cette fraction peut être bien supérieure et atteindre 60, 70, voire 80 %.
Enfin, l'invention permet d'obtenir, à partir d'une même feuille de support (20), toute une famille d'opercules (16, 16') ou feuille d'operculage (17) en faisant varier la composition de la couche extrudée (22') ou coextrudée (22), de sorte qu'il est facile d'avoir une grande variété d'opercules, aux propriétés diverses, tant en ce qui concerne leur grammage, leur "main", leurs propriétés de barrière, leur adhérence et leur force de pelage ou force d'ouverture, etc....The invention has great advantages.
Indeed, on the one hand, the lids (16, 16 ') according to the invention can be sealed on pots with sealing beads (18) of variable depth, without affecting the sealing of the packaging (1) and the adhesion of the seal on the pot, which is very advantageous in practice because it increases the adjustment tolerances of sealing tools on industrial line, and thus greatly reduces the scrap rate and health risks related to leaks in packaging (1).
On the other hand, the invention makes it possible to obtain operculas (16, 16 ') or sealing foils (17) that are economical to manufacture insofar as one can have lids with a fraction of at least 50% of the thickness or at least 50% of the mass corresponds to an extruded (22 ') or coextruded layer (22) formed from granulated plastic material. This fraction can be much higher and reach 60, 70 or even 80%.
Finally, the invention makes it possible to obtain, from one and the same support sheet (20), a whole family of lids (16, 16 ') or lidding foil (17) by varying the composition of the extruded layer (22 ') or coextruded layer (22), so that it is easy to have a wide variety of covers, with various properties, as regards their weight, their "hand", their barrier properties , their adhesion and peel force or opening force, etc ....

LISTE DES REPERESLIST OF REFERENCES

EmballagePackaging 11 Contenant ou RécipientContainer or Container 1010 Plage de thermoscellage de 10Heat sealing range of 10 1212 Ouverture de remplissage de 10Filling aperture of 10 1414 Operculeoperculum 1616 Opercule prédécoupéPrecut shutter 16'16 ' Feuille d'operculageLeaf sealing 1717 Pile d'opercules prédécoupésStack of pre-cut operculcles 17'17 ' Cordon de scellageSealing cord 1818 Partie centrale affaisséeCentral part sagging 180180 Bourrelet intérieurInside bead 181181 Bourrelet extérieurOuter bead 182182 Trace de 18 sur 12Trace of 18 of 12 183183 Patte d'arrachementBreakout tab 1919 Feuille de supportSupport sheet 2020 Couche de métallisationMetallization layer 2121 Couche coextrudéeCoextruded layer 2222 Couche extrudéeExtruded layer 22'22 ' Outil de scellageSealing tool 2424 Rainure annulaire de 12Annular groove of 12 2626 Bourrelets annulaires de 12Annular beads of 12 28, 2928, 29 Surépaisseurs annulaires de 22Ring thicknesses of 22 30, 3130, 31 Partie centrale annulaire amincie de 22Ring core thinned of 22 3232 Déchirure de 18Tear of 18 3333 Couche d'adhésif de 22Adhesive layer of 22 3434 Couche intermédiaire de 22Intermediate layer of 22 3636 Couche de scellage de 22Sealing layer of 22 38, 38'38, 38 ' Primaire d'accrochage de 20 ou 21 (externe)Primary fastening of 20 or 21 (external) 3939 Primaire d'accrochage de 20 ou 21 (interne)Primary fastening of 20 or 21 (internal) 4040 ImpressionImpression 4141 Vernis de sur-impressionOverprint varnish 4242 Effort manuel de pelageManual effort of peeling 4444

Claims (24)

  1. Packaging (1) comprising a container (10) made of plastic provided with a zone (12) bounding an opening for filling and sampling (14), said container containing a product, typically a food product and a lid (16) from a flexible sealing sheet (17) sealed by heat-sealing on the zone (12) of the container (10) using a sealing layer, and detachable from the latter by peeling, said lid being made interdependent with said zone of said container by a sealing bead (18), the sealing sheet (17) including a backing sheet (20) and an extruded layer (22') or a coextruded layer (22) made of plastic, said extruded layer (22') forming said sealing layer (38'), said coextruded layer (22) including a layer forming said sealing layer (38), said extruded (22') or coextruded (22) layer having a thickness Ec selected so that said peeling of the lid (16) causes a cohesive rupture of the extruded (22') or coextruded (22) layer, characterized in that said extruded (22') or coextruded (22) layer is formed from a material selected so as to adhere, by its outside surface, to said backing sheet (20), and by its inside surface, to said zone during said heat-sealing, and said backing sheet (20) is covered on its outside by a metallization layer (21),
  2. Packaging according to claim 1 in which the backing sheet (20) is a plastic sheet.
  3. Packaging according to claim 2 in which the plastic sheet is made from plastic chosen from: a polyester, in particular polyethylene terephthalate (PET), a polyolefin, in particular a polypropylene (PP), a polyamide (PA) or a cyclo olefin copolymer (COC).
  4. Packaging according to any of claims 1 to 3 in which said backing sheet (20) and/or said metallization layer (21) includes, on at least one of its faces, a layer of primer (39,40).
  5. Packaging according to any of claims 1 to 5 in which said extruded (22') or coextruded (22) layer is of thickness Ec ranging from 5 µm to 80 µm, and typically from 15 µm to 60 µm.
  6. Packaging according to claim 5 in which said extruded (22') or coextruded (22) layer is of thickness Ec ranging from 25 µm to 40 µm, and typically of thickness ranging from 30 µm to 35 µm.
  7. Packaging according to any of claims 1 to 6 in which the coextruded layer (22) comprises three layers and has an adhesive layer (34) assembled to the backing sheet (20), an intermediate layer (36) and a sealing layer (38) assembled onto the zone (12) of the container (10).
  8. Packaging according to any of claims 1 to 7 in which the coextruded layer (22) comprises two layers and has an adhesive layer (34) assembled to the backing sheet (20), and a sealing layer (38) assembled onto the zone (12) of the container (10).
  9. Packaging according to any of claims 7 to 8 in which the layer of adhesive (34) contains at least one of the following components: grafted copolymers and/or copolymers and/or terpolymers including acid groups or ionomers, metallocene PE, linear PE, EVA copolymers, EMA copolymers, EEA copolymers, EBA copolymers, mixtures of these components or a polyolefin with a tackifying resin.
  10. Packaging according to any of claims 7 to 9 in which said adhesive layer (34) has a thickness ranging from 2 µm to 10 µm.
  11. Packaging according to any of claims 1 to 10 in which the sealing layer (38, 38') contains at least one of the following components: ethylene and vinyl acetate (EVA) copolymer, ethylene and methyl acrylate (EMA) copolymer, ethylene and butyl acrylate (EBA) copolymer, ethylene and ethyl acrylate (EEA) copolymer, terpolymers with α-olefin monomers including esters.
  12. Packaging according to claim 11 in which said sealing layer (38, 38') includes at least one of said components and at least tackifying resin.
  13. Packaging according to any of claims 1 to 12 in which said sealing layer (38, 38') has a thickness ranging from 5 µm to 70 µm.
  14. Packaging according to claim 7, characterized in that the intermediate layer (36) contains at least one of the following components: polyamide (PA), cyclo olefin polymer or copolymer (COC), polyolefin homopolymer or copolymer, with or without mineral or organic loads.
  15. Packaging according to any of claims 1 to 14 in which the sealing layer (38, 38') contains a mineral or organic load.
  16. Packaging according to any of claims 7 to 14 in which said intermediate layer has a thickness ranging from 2 µm to 40 µm.
  17. Packaging according to any of claims 1 to 16 in which the container (10) is made from a material chosen from: a polystyrene (PS), a polyester (PET), a polyolefin, in particular polyethylene (PE) or polypropylene (PP), polyvinyl chloride (PVC).
  18. Packaging according to any of claims 1 to 17 in which a printed pattern (41) is formed on an external surface of said backing sheet (20) or of said metallization layer (21) or of said primer (39).
  19. Packaging according to claim 18 in which an overprinting varnish (42) covers said printed pattern (41).
  20. Packaging according to any of claims 1 to 19 in which said sealing bead (18), formed during said heat-sealing by a sealing tool (24), includes a collapsed ring-shaped central part (180) bordered by two peripheral ribs (181, 182), an internal rib (181) and an external rib(182), said peripheral ribs (181, 182) including an extra thickness of said coextruded layer (22), said extra thickness being at least equal to 1.5 Ec.
  21. Packaging according to any of claims 1 to 20 in which said sealing bead, formed during said heat-sealing by a sealing tool, includes a collapsed ring-shaped central part bordered by two peripheral ribs, an internal rib and an external rib, said peripheral ribs including an extra thickness of said coextruded layer, said extra thickness being at least equal to 1.5 Ec.
  22. Lid (16) designed to be sealed by heat sealing on the zone (12) of the container (10) of said packaging (1) according to any of claims 1 to 21, said lid (16) being a part of said sealing sheet (17) or a precut lid (16') from a pile (17') of lids precut from said sealing sheet (17).
  23. Manufacturing process for a sealing sheet (17) designed to form said lid according to claim 22 or to form part of said packaging according to any of claims 1 to 21, in which:
    a) said backing sheet (20) is procured, typically in the form of a reel, said backing sheet being typically covered by said metallization layer (21), and being a film typically chosen from films of: PET, PA, PP, COC, said film having a thickness ranging from 7 µm to 200 µm,
    b) to the internal surface of said backing sheet (20) is applied by co-extrusion a co-extruded layer (22, 22') including on the inside said adhesive layer (34) designed to adhere to said backing sheet (20), and on the outside said sealing layer (38), said co-extruded layer (22, 22') having a thickness Ec ranging from 25 µm to 40 µm.
  24. Process according to claim 23 wherein said co-extruded layer (22, 22') includes, between said adhesive (34) and sealing (38) layers, said intermediate layer (36) whose thickness ranges from 2 µm to 40 µm.
EP05786144A 2004-07-09 2005-07-05 Package comprising a plastic container closed with a peelable inner seal heat-sealed to said container Not-in-force EP1773683B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL05786144T PL1773683T3 (en) 2004-07-09 2005-07-05 Package comprising a plastic container closed with a peelable inner seal heat-sealed to said container
SI200531035T SI1773683T1 (en) 2004-07-09 2005-07-05 Package comprising a plastic container closed with a peelable inner seal heat-sealed to said container

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0407699A FR2872788B1 (en) 2004-07-09 2004-07-09 PACKAGING COMPRISING A PLASTIC CONTAINER OBTAINED BY A THERMOSCELLET PELABLE OPERATOR RECIPIENT AUDIT
PCT/FR2005/001717 WO2006016038A1 (en) 2004-07-09 2005-07-05 Package comprising a plastic container closed with a peelable inner seal heat-sealed to said container

Publications (2)

Publication Number Publication Date
EP1773683A1 EP1773683A1 (en) 2007-04-18
EP1773683B1 true EP1773683B1 (en) 2010-03-17

Family

ID=34948210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05786144A Not-in-force EP1773683B1 (en) 2004-07-09 2005-07-05 Package comprising a plastic container closed with a peelable inner seal heat-sealed to said container

Country Status (10)

Country Link
EP (1) EP1773683B1 (en)
AT (1) ATE461131T1 (en)
DE (1) DE602005020016D1 (en)
DK (1) DK1773683T3 (en)
ES (1) ES2342949T3 (en)
FR (1) FR2872788B1 (en)
PL (1) PL1773683T3 (en)
PT (1) PT1773683E (en)
SI (1) SI1773683T1 (en)
WO (1) WO2006016038A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2952358B1 (en) * 2009-11-06 2012-01-20 Alcan Packaging Selestat PELABLE PACKAGING SYSTEM FOR FRESH FOOD WITH LOW DURATION OF STORAGE.
CN109130381A (en) * 2018-07-06 2019-01-04 黄山永新股份有限公司 A kind of Yoghourt plastic cup sealing epiphragma

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1336878C (en) * 1988-09-08 1995-09-05 Roger Peter Genske Peelable packaging and sheet materials and compositions for use therein
TW203624B (en) * 1991-02-28 1993-04-11 Sumitomo Bakelite Co
US5342684A (en) * 1991-08-15 1994-08-30 R. J. Reynolds Tobacco Company Polymeric die-cuttable lidding materials
FR2716442B1 (en) * 1994-02-23 1996-09-13 Lawson Mardon Trentesaux Sa Multilayer structure, intended in particular to produce lids for closing containers.
US6264098B1 (en) * 1997-02-06 2001-07-24 Sonoco Development, Inc. Tubular container with a heat seal having non-symmetrical inner and outer beads

Also Published As

Publication number Publication date
EP1773683A1 (en) 2007-04-18
PL1773683T3 (en) 2010-08-31
FR2872788B1 (en) 2007-09-07
PT1773683E (en) 2010-06-16
ATE461131T1 (en) 2010-04-15
DK1773683T3 (en) 2010-06-14
DE602005020016D1 (en) 2010-04-29
SI1773683T1 (en) 2010-08-31
ES2342949T3 (en) 2010-07-19
WO2006016038A1 (en) 2006-02-16
FR2872788A1 (en) 2006-01-13

Similar Documents

Publication Publication Date Title
EP1053952B1 (en) Resealable package having a tearable layer and and method of manufacturing the same
EP2230190B1 (en) Membrane seal provided with a pull tab for sealing a container
US9815589B2 (en) Tabbed sealing member with improved heat distribution for a container
EP1053865B1 (en) Multilayer structure which can be obtained by reclosing of the coextrusion bubble
JP5573252B2 (en) Packaging materials, and packaging containers and lids using the same
US11878502B2 (en) Fracture film for peelable membrane containers
EP0424251B1 (en) Multilayer plastic foil for making containers to be closed by means of a welded lid, and containers made thereof
EP2637861B1 (en) A laminate for use in packages, a method of making a reclosable laminate and use thereof
JP6829500B2 (en) High-frequency induction heating container that can be bonded on both sides A sealed body, a compact cosmetic container with a tamper function to which it is applied, and a container with a flip cap with a tamper function to which it is applied.
EP3141373A1 (en) Method and machine for manufacturing composite heat-welded trays and tray
FR2577897A1 (en) Sealed multi-layer non-peelable lid provided with a controlled opening device, method of making such a lid and device for using this method
EP1773683B1 (en) Package comprising a plastic container closed with a peelable inner seal heat-sealed to said container
WO2003035391A2 (en) Multilayer sealing materials or peelable seals
JP6589454B2 (en) Packaging material and method for producing packaging container
US20200277121A1 (en) Sealing cover having opening tap for containers and method for manufacturing the same
JP2003237816A (en) Lid material
JP2002225175A (en) Lid material
EP1963202B1 (en) Peel-off films for closing sterilizable containers
JP3644871B2 (en) Container with easy peel laminated film lid and lid
JP3841877B2 (en) Multilayer film and laminate using the same
US20220411146A1 (en) Foil Free Tabbed Seal
JP2769564B2 (en) Multilayer structure and easy-open container
FR3015925A1 (en) THERMOSCELLABLE OPERATOR FOR THE FILLING OF A CONTAINER AND METHOD OF MANUFACTURING THE SAME
JP2012086884A (en) Barrel material for paper container and paper container using the same

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20070109

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

17Q First examination report despatched

Effective date: 20070611

DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 602005020016

Country of ref document: DE

Date of ref document: 20100429

Kind code of ref document: P

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: WILLIAM BLANC & CIE CONSEILS EN PROPRIETE INDUSTRI

REG Reference to a national code

Ref country code: GR

Ref legal event code: EP

Ref document number: 20100401226

Country of ref document: GR

REG Reference to a national code

Ref country code: RO

Ref legal event code: EPE

Ref country code: DK

Ref legal event code: T3

REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20100609

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: NL

Ref legal event code: T3

REG Reference to a national code

Ref country code: CH

Ref legal event code: PFA

Owner name: ALCAN PACKAGING SELESTAT

Free format text: ALCAN PACKAGING SELESTAT#2, RUE FREDERIC MEYER - BP 128#67603 SELESTAT CEDEX (FR) -TRANSFER TO- ALCAN PACKAGING SELESTAT#2, RUE FREDERIC MEYER - BP 128#67603 SELESTAT CEDEX (FR)

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2342949

Country of ref document: ES

Kind code of ref document: T3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20100317

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20100317

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20100317

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20100317

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20100317

REG Reference to a national code

Ref country code: PL

Ref legal event code: T3

REG Reference to a national code

Ref country code: SK

Ref legal event code: T3

Ref document number: E 7426

Country of ref document: SK

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20100317

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20100317

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20100717

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: CONSTANTIA TEICH GMBH

Effective date: 20101214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100731

REG Reference to a national code

Ref country code: HU

Ref legal event code: AG4A

Ref document number: E009164

Country of ref document: HU

PLAX Notice of opposition and request to file observation + time limit sent

Free format text: ORIGINAL CODE: EPIDOSNOBS2

REG Reference to a national code

Ref country code: CH

Ref legal event code: PCAR

Free format text: NOVAGRAAF SWITZERLAND SA;CHEMIN DE L'ECHO 3;1213 ONEX (CH)

PLAF Information modified related to communication of a notice of opposition and request to file observations + time limit

Free format text: ORIGINAL CODE: EPIDOSCOBS2

PLBB Reply of patent proprietor to notice(s) of opposition received

Free format text: ORIGINAL CODE: EPIDOSNOBS3

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20110725

Year of fee payment: 7

Ref country code: DK

Payment date: 20110725

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CZ

Payment date: 20110630

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SK

Payment date: 20120621

Year of fee payment: 8

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: AMCOR FLEXIBLES SELESTAT SAS

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20120620

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100705

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20120727

Year of fee payment: 8

Ref country code: GB

Payment date: 20120725

Year of fee payment: 8

Ref country code: IE

Payment date: 20120725

Year of fee payment: 8

Ref country code: RO

Payment date: 20120702

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BG

Payment date: 20120730

Year of fee payment: 8

Ref country code: GR

Payment date: 20120727

Year of fee payment: 8

Ref country code: SI

Payment date: 20120627

Year of fee payment: 8

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO

APBM Appeal reference recorded

Free format text: ORIGINAL CODE: EPIDOSNREFNO

APBP Date of receipt of notice of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA2O

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: HU

Payment date: 20120626

Year of fee payment: 8

Ref country code: DE

Payment date: 20120727

Year of fee payment: 8

Ref country code: BE

Payment date: 20120725

Year of fee payment: 8

Ref country code: IT

Payment date: 20120723

Year of fee payment: 8

Ref country code: FR

Payment date: 20120731

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20120724

Year of fee payment: 8

Ref country code: PT

Payment date: 20120105

Year of fee payment: 8

APBQ Date of receipt of statement of grounds of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA3O

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20120620

Year of fee payment: 8

REG Reference to a national code

Ref country code: PT

Ref legal event code: MM4A

Free format text: LAPSE DUE TO NON-PAYMENT OF FEES

Effective date: 20140106

BERE Be: lapsed

Owner name: ALCAN PACKAGING SELESTAT

Effective date: 20130731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20140201

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

Effective date: 20130731

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 461131

Country of ref document: AT

Kind code of ref document: T

Effective date: 20130705

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20130705

REG Reference to a national code

Ref country code: SI

Ref legal event code: KO00

Effective date: 20140207

REG Reference to a national code

Ref country code: SK

Ref legal event code: MM4A

Ref document number: E 7426

Country of ref document: SK

Effective date: 20130705

REG Reference to a national code

Ref country code: GR

Ref legal event code: ML

Ref document number: 20100401226

Country of ref document: GR

Effective date: 20140204

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20140331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140201

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130731

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130731

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130706

Ref country code: SK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130731

Ref country code: HU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130706

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140201

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602005020016

Country of ref document: DE

Effective date: 20140201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130731

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

Ref country code: SI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130706

Ref country code: GR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140204

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: TR

Payment date: 20120625

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140106

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130731

REG Reference to a national code

Ref country code: PL

Ref legal event code: LAPE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

APBY Invitation to file observations in appeal sent

Free format text: ORIGINAL CODE: EPIDOSNOBA2O

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130705

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20150727

Year of fee payment: 11

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20170821

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160731

APAR Information on invitation to file observation in appeal modified

Free format text: ORIGINAL CODE: EPIDOSCOBA2O

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 20160706

APBU Appeal procedure closed

Free format text: ORIGINAL CODE: EPIDOSNNOA9O

PLBD Termination of opposition procedure: decision despatched

Free format text: ORIGINAL CODE: EPIDOSNOPC1

REG Reference to a national code

Ref country code: DE

Ref legal event code: R100

Ref document number: 602005020016

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170808

PLBM Termination of opposition procedure: date of legal effect published

Free format text: ORIGINAL CODE: 0009276

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION PROCEDURE CLOSED

27C Opposition proceedings terminated

Effective date: 20181126