EP1053952B1 - Emballage refermable dont le contenant comprend une couche soudante dechirable, son procédé de fabrication - Google Patents

Emballage refermable dont le contenant comprend une couche soudante dechirable, son procédé de fabrication Download PDF

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Publication number
EP1053952B1
EP1053952B1 EP00401331A EP00401331A EP1053952B1 EP 1053952 B1 EP1053952 B1 EP 1053952B1 EP 00401331 A EP00401331 A EP 00401331A EP 00401331 A EP00401331 A EP 00401331A EP 1053952 B1 EP1053952 B1 EP 1053952B1
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EP
European Patent Office
Prior art keywords
layer
packaging according
layers
adhesive
welding
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Revoked
Application number
EP00401331A
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German (de)
English (en)
French (fr)
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EP1053952A1 (fr
Inventor
Jean-Claude Engelaere
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Soplaril SA
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Soplaril SA
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2068—Means for reclosing the cover after its first opening
    • B65D77/2096—Adhesive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • Y10T428/1359—Three or more layers [continuous layer]

Definitions

  • the subject of the invention is a reclosable packaging, which offers easy opening and closing effective.
  • This type of packaging with a flexible seal resealable on the container, is known, especially in the food industry, both for so-called packaging "under gas” with a rigid tray (thermoformed or preformed for example by injection) than for so-called “vacuum” packaging with a flexible tray thermoformed.
  • Application GB-A-2 319 746 (in the name of Dolphin) describes heat-sealable films for packaging resealable.
  • This packaging includes a tray (A) comprising a support layer (for example PVC or PET), a layer of PE and a thin film of resin ionomer or ethylene / methyl acrylate copolymer and a flexible cover (B) comprising an ionomer layer or copolymer identical to the previous layer, with which it cooperates with, and a layer of adhesive elastomer, a PE layer and a support layer (PVC, FART).
  • the welding is carried out by the layers of ionomer or copolymer resin ethylene / methyl acrylate, the films (A) and (B) being placed between bars, the upper bar alone being heated.
  • This structure is only functional because the ionomer or copolymer resin with a low melting point (and in particular lower than that of the adhesive layer).
  • US-A-3454210 describes a package comprising a tray and a cover, this cover comprising by example a layer of PET, a layer of treated PE Corona, a layer of adhesive and a layer of PE welding. It is further to indicate, but without example and without full description, that the resealable film can also be present at the level of the tray.
  • the invention provides a resealable package comprising the technical characteristics of claim 1.
  • the layer of adhesive by pressure is applied directly to the support layer.
  • a complexable layer is placed between the support layer and the adhesive layer by pressure.
  • a structure comprising the complexable, adhesive and sealing layers tearable is laminated to the support layer the cap.
  • the container is a rigid tray.
  • the container is a flexible tray.
  • the container is thermoformed.
  • the tear according to the bead is made within the adhesive layer.
  • the temperature of melting of the tearable weldable layer is greater than that of the adhesive layer.
  • the layer of adhesive by pressure includes an elastomer-based hot melt adhesive thermoplastic.
  • the adhesive comprises of 5 25% by weight of masterbatch containing a filler.
  • the welding layers are in PE.
  • the welding layers tearable materials include metallocene PE.
  • the layers complexable and weldable tears are identical compositions.
  • the structure comprising the complexable, adhesive and sealing layers tearable is symmetrical in composition, the layer adhesive comprising two sub-layers.
  • the structure is obtained by reclosing the coextrusion bubble.
  • the reclosing of the coextrusion bubble takes place in an oxidizing medium.
  • the invention also relates to a method of manufacture of a packaging according to the invention, comprising the welding of the welding layers.
  • the structure comprising the support layer, the complexable layer and the pressure adhesive layer, is prepared in a first then the container is prepared.
  • the structure can be laminated to the container
  • the structure can be prepared by resealing the coextrusion bubble.
  • the support layers, of pressure-sensitive and weldable adhesive are prepared by coextrusion or by calendering.
  • the welding is done with stamping between two bars, only one of which is heating, cover side B).
  • the welding is done with stamping between two bars, only one of which is heating.
  • FIG. 1 describes the packaging according to a mode of realization of the invention, after welding.
  • This packaging includes a container (A) and a seal (B).
  • the container (A) comprises a support layer (1), a layer complexable (2), a layer of pressure-sensitive adhesive (3) and a tearable weldable coating (4).
  • the container can also understand, between the support layer (1) and the complexable layer (2) a binding layer (7), if necessary.
  • a sub-part of this container (A) is the structure (C), which includes layers (2), (3) and (4).
  • the cover (B) comprises a layer, support (6) and a welding layer (5). Weldable tear-off layers (4) and weld (5) are opposite one another.
  • the cover (B) can also comprise a binding layer (8) between layers (5) and (6), if necessary.
  • the cover (B) is welded to the container (A) for example with stamping, using bars, preferably only one is heated and is placed on the side cover.
  • the welding area i.e. the bead (D)
  • This deformation is characterized by a reduction and / or modification of thicknesses, due to softening and / or melting of certain layers which causes the creep of their components on the edges of the weld bead.
  • the welding area (bead (D)) delimits the embrittlement zone.
  • the support layer (6) of the cover (B) is generally little affected by welding, because the components of this support layer have generally significantly higher melting points than those of the components of the welding layer (5). It is generally the same for the binder layer (8) of the cap.
  • the above remarks apply from same way to the support layer (1) and to the binding layer (7) of the container (A), which are further on. of the heat source, for the preferred case of use a single heating strip on the side of the cover.
  • the welding conditions are conventionally adjusted so that the deformation is at the level of the welding layers tearable (4) and weldable (5).
  • the adhesive layer (3) being generally malleable due to its nature, and generally representing a relatively thick structure (C), there will generally be no fusion or creep in the entire thickness.
  • the adhesive layer supporting substantially all of the deformation, the complexable layer (2) will not therefore, in general, not deformed and therefore not weakened.
  • the embrittlement, at the weld bead is therefore mainly generated in the tearable weldable layer (4) and possibly partially in the layer adhesive (3).
  • the welding layer (5) is not fragile and its tear resistance is higher than that of layer (4), as well as the cohesive force of the adhesive layer (3). When opening the packaging, the constraints propagate and cause the rupture of most fragile layers, namely the welding layer tearable (4) and part of the layer thickness adhesive.
  • Figure 2 shows the packaging according to the invention after opening.
  • the tear is done on both sides weld bead (D) (the stamped area), which has to release a strip composed of the layer weldable tear torn (9) and part (10) of the adhesive layer (3), which remain welded to the layer seal of the cover (B).
  • Part of the layer adhesive (3) ensuring the reclosure is on each of the internal faces of the container (A) and cover (B) of the packaging. Just reposition in front of face the two areas corresponding to the tear and to apply pressure to ensure the closing of packaging.
  • the reclosing force (re-bonding of the adhesive on itself) is proportional to the pressure exercised for reclosure.
  • the tear in the adhesive layer causes a slight whitening of this due to the irregularity of the surfaces of rupture resulting in iridescence.
  • the reclosure is then maximum when the pressure exerted makes the area again transparent tear. Indeed, in this case, the continuity of the adhesive layer was reconstituted, and this adhesive layer no longer exhibits then surface iridescence.
  • the reopening and reclosing are identical to the operations described above.
  • An advantage of the invention over art anterior in the case of a structure (thermo) formed with seal resides in the fact that the adhesive is at the container level. So using just one heating strip for soldering, and by soldering side operculum (which is generally the case because the operculum is generally thinner than the tray), the invention allows to limit the deformation of the adhesive, because it is farther from the heat source than in art prior.
  • the rupture be a cohesive rupture (rupture in the thickness of the layer by decohesion) in the adhesive layer (3).
  • This cohesive rupture can in particular be obtained from two ways: on the one hand by adding additives and on the other part by the bubble reclosing technique. These two non-limiting routes are described below.
  • the multilayer film forming the container (A) is welded on itself.
  • the packaging then includes two containers (A) and (A '), which have the same configuration.
  • the mechanism of operation is the same as before.
  • the part located on the side of the heating strip undergoes the matrixing effect while that of the non side heating does not undergo it. That way, upon opening, only the tearable weldable layer having been located on the side of the heating strip tears and the opening is therefore sharper. So the situation is then identical to that described above.
  • the container (A ') may also include a binder layer (7 '), similarly so that the container (A).
  • the elements (A) and (A ') are formed of the same structure.
  • the complexable layer is not necessary and can be omitted, for example in the case where the sheet from which the container (A) is derived is manufactured by extrusion. In this case, we will have the adhesive directly (3) on the support (1).
  • coextrusion we can produce for example a multilayer of the PET type or PS or PP / Hot Melt / PE type adhesive that can be torn off adapted line (such as a coextrusion cast line (to flat) capable of producing semi-rigid sheets thermoformable around 500 ⁇ m).
  • the complexable layer is generally present and we can first coextrude a film complexable PE three-layer / Hot Melt type adhesive / PE tearable, and apply this a little further on a support film for example a PVC film (the PE layer complexable in this case not being treated Corona).
  • the support film coming out of the grille is still hot (just like in general the extruded three-layer film) when the three-layer film is applied. This avoids the maximum deformation of the support sheets such as PVC sheets.
  • the adhesion of the bilayer film is improved when the application of it is done using a grille.
  • the final multilayer product can then be thermoformed or undergo other treatment, if necessary.
  • this complexable layer will generally be present when the sheet from which the container comes (A) is manufactured by laminating or laminating.
  • the container (A) schematically comprises a support layer (1), on which the structure is deposited (C), said structure (C) comprising the layers (2), (3) and (4).
  • This structure (C) has a thickness in general between 20 and 200 ⁇ m, preferably 30 to 100 ⁇ m.
  • the adhesive layer (3) preferably represents more than 30%, advantageously more than 40%, of the thickness of the structure (C); ; layers (2) and (4) represent each in general from 10 to 50%, preferably from 10 to 30 %.
  • This complexable layer can be transparent or opaque. Its thickness can vary from 10 to 100 ⁇ m, from preferably 10 to 30 ⁇ m.
  • This complexable layer is made of polyolefin.
  • This term has the acceptance commonly used in art.
  • examples include homopolymers and copolymers olefins, with other olefins or other types of monomer (such as vinyl acetate, (meth) alkyl acrylates).
  • PE such as: HDPE, MDPE, LMDPE, LDPE, LLDPE, VLDPE, PE metallocene), PP, copolymers of PE with a alpha-olefin, EVA copolymers, etc.
  • composition of this layer can also be suitable for improving adhesion to the adhesive layer (3).
  • this layer can comprise from 20 to 90%, preferably 50 to 70%, metallocene PE or binder coextrusion (such as those based on modified PE).
  • additives may be present, for example anti-oxidants, anti-block, slippery, etc., in particular to facilitate the extrusion and the machinability of the film.
  • the tearable weldable layer (4) is located on the external face of the structure (C). Its function seal the packaging with a seal thermal. This is done on itself (sacherie) or on the sealing layer of the cover (for example welding between the lid and the rigid tray).
  • This layer (4) is tearable, preferably in both directions (machine direction MD and transverse direction TD). This tearability is obtained for example by the choice of resins used in the mixture and / or by the addition of mineral fillers which increase its fragility and / or by thickness adjustment.
  • the melting temperature of this layer (4) is generally higher than that of the adhesive layer (5).
  • This tearable weldable layer can be transparent or opaque. Its thickness can vary from 10 to 100 ⁇ m, preferably 10 to 30 ⁇ m.
  • This layer is generally made of polyolefin, the polyolefin can in particular be the same as that used for the complexable layer.
  • This tearable welding layer being external, will advantageously have good machinability, obtained for example by adding slip and anti-block agents which facilitate sliding on the elements of the packaging machine. This slide will be in particularly appreciated when used on machines vertical. (Ks ⁇ 0.25), where Ks is the coefficient of static sliding).
  • This welding layer will present advantageously hot sticky properties (or heat resistance properties) even when welding is still hot: the solder does not re-separate when the product to be packed falls into the bag (in the case vertical machine) and / or when gas is injected onto thermoforming machine (i.e. said layer welding will advantageously have properties of "hot tack"). For this last property, we will add advantageously metallocene PE to said layer welding.
  • this welding layer tearable will also preferably be adjusted so that the touch a little tacky, in order to avoid any sticking untimely or any contamination by the product packed up.
  • the charges can be added in order to favor the tearable nature of mineral fillers, such as talc and calcium carbonate, present in quantities of, for example, between 5 and 30%, preferably between 5 and 15%.
  • additives can be added, such as anti-fog additives, surfactants can also be deposited on its external face.
  • This tearable weldable layer tears substantially only in the weld zone, namely the cord (D). Indeed, the layer is weakened in this zone.
  • the mastering of the weld zone reduces its mechanical resistance which becomes lower than that of non-welded areas.
  • the tear strength may vary; however, it will be adjusted to fit advantageously between 700 and 1000 g / 15 mm, which corresponds to the values of a current peelable film.
  • the width of the cord will be for example from 4 to 12 mm, preferably between 5 and 8 mm.
  • the adhesive layer (3) recloses packaging after opening.
  • the complexable and weldable layers tearable include for example a metallocene PE or a binder resin.
  • the tear will preferably take place in the adhesive layer; the rupture is cohesive. So, part of the pressure adhesive is on each side of the package. The reclosing force is thus made maximum because there is adhesion of the adhesive on itself.
  • the tearable weldable layer comprises for example metallocene PE or a binder, then there will also have good adhesive adhesion on this layer, which makes it easier to reposition the faces of packaging.
  • the adhesive layer includes pressure adhesive (or a self-adhesive).
  • This can be a hot melt, especially based on an elastomer or other polymers which are not elastomeric, such as EVA.
  • This adhesive may also not be of the hot-melt type, but may be diluted in solvent medium or in aqueous phase.
  • hot melt adhesive is M3062 ATO FINDLEY (5.3g / 10min melt index, at 190 ° C below 2.16kg).
  • the adhesive will include in particular as additives mineral fillers, of the talc or calcium carbonate type, or processability agents (fluorinated products), introduced in relatively large quantities (for example compared to the quantities normally used).
  • mineral fillers the content is example between 3 and 15% by weight.
  • fluorinated products the content is for example between 0.2 and 3% by weight.
  • the additive is added in most cases under master mix form; in this case, the adhesive includes generally 5 to 25% by weight of masterbatch containing a filler or processability agents.
  • a multilayer film comprising a layer of an adhesive as above, can be thermoformed.
  • adhesives of sufficiently high viscosity to avoid or limit as much as possible the creep (which would otherwise lead to deformations such as inhomogeneity of the thickness, formation of "waves", etc.) as well as the flow of adhesive between layers during thermoforming and the flow on the welding equipment.
  • a high viscosity also reinforces the phenomenon of the absence of deformation when applying a heating strip for soldering (by soldering side lid).
  • Binder layers may be present, between the adhesive and complexable layers and / or between the layers of adhesive and weldable tear and / or between the adhesive and backing layers. If such layers of binder (L) are used (the structure then becoming a 5-layer structure, for example of the type PE / L / HotMelt / L / PE), the complexable and / or weldable tear (and / or support) can then have a more "simple" composition, without adding a binding agent and / or metallocene PE (however, even in in this case an additive weld layer).
  • the binder likely to be used pure in diapers intermediates or diluted in the complexable layers and / or weldable tear is a coextrusion binder which can be chosen in particular from the above polyolefins that are changed.
  • a coextrusion binder which can be chosen in particular from the above polyolefins that are changed.
  • the starting polyolefin we will take for example PE, EVA copolymers with high comonomer content, etc.
  • the modification is done by grafting or copolymerization.
  • the polyolefin can be maleated (for example by maleic anhydride).
  • the binder is preferably chosen so that the adhesion force is greater than the tearing force of the adhesive layer.
  • the thickness of the structure (C) is then understood by example between 40 and 200 ⁇ m, preferably 50 to 100 ⁇ m.
  • the thickness of the binder layers is generally understood between 2 and 10 ⁇ m, preferably between 3 and 5 ⁇ m.
  • Structure (C) can be prepared according to several processes. These processes include extrusion-cast (to flat), extrusion-sheath, etc. An interesting process is the sheath extrusion process in which preferably the structure (C) is obtained by closing the bubble coextrusion. This embodiment is described in figure 3. We then obtain a symmetrical structure, the complexable and weldable tearable layers having the same composition. Likewise, the adhesive layer (3) becomes two sublayers (3a) and (3b) (respectively, layer (3 ') includes two sub-layers (3'a, 3'b)).
  • air is in general used for inflating the bubble and its cooling. This air slightly oxidizes the surface of the adhesive layer (hot melt) before gluing. The force required to tear in the adhesive layer is weaker in the layer bonding area, does slight oxidation of these on the surface, only the very interior of these layers. We can still favor this oxidation by injecting one. oxidizing agent at the level of the bubble. As an oxidizing agent, ozone taken from treatment equipment corona.
  • the bubble can be closed again for example at a temperature between 40 and 60 ° C and at a pressure from 4 to 6 bars, preferably around 5 bars, at level of the draw bench rollers.
  • the bonding force of the layers is a function of the pressure exerted by the rollers of the pulling bench and the temperature of the film. These parameters can be adjusted so that the bonding force is less than the adhesive strength between the adhesive layer and the tearable complexable / weldable layer. Of this way, the adhesive layer will necessarily be present on both sides of the packaging (after opening).
  • This bubble resealing technique can be also applied to structures comprising layers of binder.
  • the device will be adapted accordingly; the layer compositions will also be adapted as indicated above.
  • this structure obtained by bubble reclosure can be applied to any type packaging, either according to the invention or according to art prior. So we can use the structure as integral part of the container or cover, or as film weldable on itself in the case of the sacherie. So, this structure obtained by bubble reclosure can in particular be applied to packaging subject to WO-A-97 19867 in the name of the plaintiff, as well as the packaging subject to the request FR-A-2669607, US-A-4673601 and EP-A-0661154.
  • the invention will find particular application (but not limited to) a shutter structure provided with an opening comprising a welded sheet following the edge of the opening, this sheet being consisting of at least three layers namely a layer welding applied and welded along a bead against the edge of the opening, an outer layer forming barrier, and an intermediate adhesive layer; the welding of the weld layer bead on the edge of opening with resistance to tearing greater than the adhesion strength between the welding layer and the adhesive layer so that at the first operation clearance of the opening the welded bead remains in places on the edge of the opening and separates from the rest of the welding layer and the adhesive layer which is so discovered on an area and allows for a new one application against the cord to close the container.
  • the structure according to the invention provides the welding layer and the adhesive layer, the complexable layer integrating with the outer layer forming a barrier (which then includes the layer complexable and a support layer).
  • the multilayer structure (C) obtained by reclosing bubble according to the invention can also be applied to doypacks (standing bags, for example eco-refills for detergents) to facilitate their easy opening and closing. It avoids add a ZIP® tape which is expensive and difficult to remove during manufacture (risk of leakage).
  • This structure can also be used to seal deposits and injected trays. It can be used as welding agent in structures intended for packaging on a horizontal machine of the FFH type (for example for long-life breads, plates cheese).
  • the structure (C) according to the invention whether or not obtained by bubble closure, can be applied on a backing film.
  • This support film gives the mechanical properties and barriers to gases, steam of water and aromas.
  • Polyolefins PP-cast, oriented PP, PE
  • polyamides PA-cast, copolyamide, mono- or bi-oriented PA
  • styrenics crystal PS, impact PS, Oriented PS
  • PVC coated or uncoated paper
  • polyesters PET-cast, oriented PET, crystallizable PET, PET G
  • aluminum coated films
  • coated films with PVDC, PVA, ...)
  • vacuum metallized films based on aluminum, alumina, SiO x , .
  • the structure (C) is preferably reported on the support.
  • the structure (C) in particular by coextrusion, then this structure is applied according to different processes on the support.
  • a layer binder (7) is present between the structure according to the invention and the support and provides the link.
  • Layer binder can be an adhesive, in particular an adhesive polyurethane, in particular of the polyether type or polyester, diluted or not in a solvent.
  • a treatment Corona of the complexable layer is preferred.
  • the structure (C) is prepared, in particular by coextrusion, then is attached to the support, (preferably cold), a binder layer being deposited between the structure (C) and the support, preferably by extrusion.
  • This layer binder may be a coextrusion binder, such as described above. This binder will preferably have a lower melting temperature than that of the layer support.
  • Extrusion-lamination is similar to laminating, the difference being the binder layer instead of the glue layer. Corona layer treatment complexable is possible but it is optional.
  • the structure (C) is prepared, in particular by coextrusion, then is directly applied to the support, via calendars, which warm up the films beforehand prepared. As the layers in contact are hot, there are then adhesion between them. There is not in this case necessarily additional binder layer (although this is possible), the complexable layer sufficient for get the bond.
  • This complexable layer can by example being a high-grade EVA layer. A treatment Corona is not necessary, or it is not recommended.
  • the structure (C) coextruded still hot is applied while hot directly on the support (for example a PET film).
  • the assembly formed by all of the layers of the structure, the binding layer and the support are not coextruded together, at the difference from the prior art.
  • this association is preferably thermoformed.
  • the cover comprises a support film (6) of the type of that described above, and a welding layer (5) of the kind of the one described above.
  • Welding layers tearable (4) and weldable (5) will be the same compositions or different compositions (but compatible with each other).
  • These layers (6) and (5) can be linked together, if necessary, by a layer of binder (8).
  • This binder can be of the same type as that described above.
  • Layers may include sublayers, if applicable.
  • the support layer may comprise two layers of PET, between which there is a layer of printing ink and a layer of binder.
  • the complexable layer may comprise a layer, for example of EVA with a high content and a layer of PE (adhesive side); this additional layer can act as a reinforcing layer.
  • Complexing is done on a solvent complexing machine with the deposit of glue on the complexable side of the structure (C).
  • the film is thermoformed at one 16 mm deep to allow positioning of Ham slices.
  • the thermoforming temperature is between 100 and 130 ° C.
  • the two 3 ⁇ m layers of polyurethane adhesive with solvent bond between the layers and are deposited using a complexing machine with extraction of solvent.
  • the welding of the two films making up the packaging is made at a temperature of 150 ° C, under a pressure of 6 bars for 1.5 seconds, using solder bars whose shape can be flat or curved.
  • the force required to open the package is between 800 and 1000 g / 15 mm while that obtained after the first reclosure is between 500 and 800 g / 15 mm (depending on the pressure exerted).
  • the opening force remains greater than 400 g / 15 mm after 10 openings and closings.
  • This structure is obtained by reclosing the bubble, with an oxidizing medium.
  • Complexing is done on a complexeuse without solvent with the deposit of the adhesive on the complexable side of structure (C).
  • the film is thermoformed at 25 mm deep to allow positioning dried fruit.
  • the thermoforming temperature is between 100 and 130 ° C.
  • the welding of the two films making up the packaging is made at a temperature of 155 ° C, under a pressure of 6 bars for 1.5 seconds, using solder bars whose shape can be flat or curved.
  • the force required to open the package is between 900 and 1200 g / 15 mm (depending on the pressure exerted).
  • the opening force remains higher at 400 g / 15 mm after 10 openings and closings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Packages (AREA)
  • Laminated Bodies (AREA)
  • Closures For Containers (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
EP00401331A 1999-05-21 2000-05-16 Emballage refermable dont le contenant comprend une couche soudante dechirable, son procédé de fabrication Revoked EP1053952B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9906503A FR2793777B1 (fr) 1999-05-21 1999-05-21 Emballage refermable dont le contenant comprend une couche soudante dechirable, son procede de fabrication
FR9906503 1999-05-21

Publications (2)

Publication Number Publication Date
EP1053952A1 EP1053952A1 (fr) 2000-11-22
EP1053952B1 true EP1053952B1 (fr) 2002-06-19

Family

ID=9545890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00401331A Revoked EP1053952B1 (fr) 1999-05-21 2000-05-16 Emballage refermable dont le contenant comprend une couche soudante dechirable, son procédé de fabrication

Country Status (25)

Country Link
US (1) US6777050B1 (cs)
EP (1) EP1053952B1 (cs)
JP (1) JP3294593B2 (cs)
AR (1) AR019255A1 (cs)
AT (1) ATE219451T1 (cs)
AU (1) AU743532B2 (cs)
BR (1) BR0009623B1 (cs)
CA (1) CA2308989C (cs)
CO (1) CO5290274A1 (cs)
CZ (1) CZ20001883A3 (cs)
DE (1) DE60000220T2 (cs)
DK (1) DK1053952T3 (cs)
EG (1) EG22877A (cs)
ES (1) ES2174802T3 (cs)
FR (1) FR2793777B1 (cs)
HR (1) HRP20000326B1 (cs)
HU (1) HU224452B1 (cs)
IL (1) IL136164A0 (cs)
MX (1) MXPA00004930A (cs)
NO (1) NO319524B1 (cs)
NZ (1) NZ504628A (cs)
PL (1) PL196679B1 (cs)
PT (1) PT1053952E (cs)
TR (1) TR200001448A3 (cs)
ZA (1) ZA200002464B (cs)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2143557A1 (en) 2008-07-07 2010-01-13 Alcan Technology & Management Ltd. Packaging film for manufacturing reclosable packaging

Also Published As

Publication number Publication date
DE60000220T2 (de) 2003-02-20
BR0009623B1 (pt) 2010-11-03
AR019255A1 (es) 2002-02-13
EG22877A (en) 2003-10-30
DE60000220D1 (de) 2002-07-25
NO319524B1 (no) 2005-08-22
HUP0001949A3 (en) 2002-05-28
JP2001010659A (ja) 2001-01-16
TR200001448A2 (tr) 2001-01-22
HU224452B1 (hu) 2005-09-28
ES2174802T3 (es) 2002-11-16
FR2793777B1 (fr) 2001-06-22
CO5290274A1 (es) 2003-06-27
US6777050B1 (en) 2004-08-17
EP1053952A1 (fr) 2000-11-22
HRP20000326B1 (en) 2003-04-30
NZ504628A (en) 2000-11-24
HRP20000326A2 (en) 2001-04-30
AU3536900A (en) 2000-11-23
BR0009623A (pt) 2002-01-22
DK1053952T3 (da) 2002-09-16
ATE219451T1 (de) 2002-07-15
JP3294593B2 (ja) 2002-06-24
TR200001448A3 (tr) 2001-01-22
AU743532B2 (en) 2002-01-31
CZ20001883A3 (cs) 2001-12-12
ZA200002464B (en) 2001-02-14
NO20002571L (no) 2000-11-22
PL196679B1 (pl) 2008-01-31
FR2793777A1 (fr) 2000-11-24
PL340177A1 (en) 2000-12-04
IL136164A0 (en) 2001-05-20
HUP0001949A2 (hu) 2000-12-28
HU0001949D0 (en) 2000-07-28
MXPA00004930A (es) 2002-03-08
CA2308989A1 (fr) 2000-11-21
NO20002571D0 (no) 2000-05-19
PT1053952E (pt) 2002-10-31
CA2308989C (fr) 2005-10-18

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