EP0977692A1 - Cap with plastic sleeve - Google Patents

Cap with plastic sleeve

Info

Publication number
EP0977692A1
EP0977692A1 EP98921561A EP98921561A EP0977692A1 EP 0977692 A1 EP0977692 A1 EP 0977692A1 EP 98921561 A EP98921561 A EP 98921561A EP 98921561 A EP98921561 A EP 98921561A EP 0977692 A1 EP0977692 A1 EP 0977692A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
blank
capsule
skirt
capsule according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98921561A
Other languages
German (de)
French (fr)
Inventor
Jacques Granger
Richard Poyol
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.)
Pechiney Emballage Alimentaire
Original Assignee
Pechiney Emballage Alimentaire
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
Application filed by Pechiney Emballage Alimentaire filed Critical Pechiney Emballage Alimentaire
Publication of EP0977692A1 publication Critical patent/EP0977692A1/en
Withdrawn legal-status Critical Current

Links

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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/62—Secondary protective cap-like outer covers for closure members
    • 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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
    • B65D41/40—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts
    • B65D41/42—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts made of relatively-stiff metallic material, e.g. crown caps
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49906—Metal deforming with nonmetallic bonding

Definitions

  • the invention relates to the field of capsules, and more particularly that of metal caps for capping and overcapping.
  • Overcapping capsules applied to the necks of containers fitted with a stopper, are intended, in addition to their certain decorative effect, in particular to guarantee the inviolability of the containers.
  • overcapping capsules are optionally provided with easy first opening means (weakening lines, detachable tabs, etc.), otherwise the capsule head is cut with a knife, so that the container can then be uncorked.
  • the problem to be solved is on the one hand to obtain capsules which are both non-cutting after cutting with a knife, and a low cost price.
  • these capsules resemble by their touch, by their malleability, by the sound when they come into contact with other objects, the lead-tin capsules, now generally prohibited by national laws, and whose image "High end" is always sought after by the consumer.
  • the plaintiff has sought to develop a capsule which can, optionally, be provided with easy opening means, during the first opening by the consumer, so that the same production line can, as desired , lead to capsules that can be opened either by cutting with a knife, or by typically pulling on a tear strip or strip.
  • the metal capsule for capping or overcapping a container having a head and a skirt comprising a metal wall, having an opening zone intended to be broken during a first opening, characterized in that said capsule comprises a plastic sleeve adhering to said metallic wall in the part of said capsule corresponding to said opening zone.
  • said opening zone comprises the upper part of the skirt - that which is close to said head - generally located at the level of the glass ring in the case where the container is a bottle.
  • said opening zone can also include the end of said skirt, up to the angle formed by the skirt and the head, insofar as certain consumers cut only the head of the capsule with a knife.
  • said skirt is covered by said sleeve over a height corresponding at least to ceUe of said opening zone.
  • FIGURES Figure 1 shows schematically the formation of a capsule blank (2) from a coil material (1), which can be an aluminum strip, of multilayer material comprising an aluminum layer.
  • a coil material (1) which can be an aluminum strip, of multilayer material comprising an aluminum layer.
  • Said blank (2) which can be formed by any known method, typically by stamping and drawing, by coUage, has a skirt (21) and a head (22).
  • Said blank (2) is shown in axial half-section, the axis (9) being an axis of cylindrical symmetry. The same representation was used for Figures 2a to 4c.
  • Figures 2a to 4c show in axial half-section capsules (10) according to the invention.
  • the sleeve (31,32) is inside said blank (2).
  • said sleeve (31) covers the skirt (21) over its entire height
  • said sleeve (32) only covers the skirt (21) over the opening area.
  • the sleeve (33,34) is outside of said blank (2).
  • said sleeve (33) covers the skirt (21) over its entire height
  • said sleeve (34) only covers the skirt (21) over the opening zone.
  • FIG 4a similar to Figure 2b, there is shown a capsule (10) having a circular tear strip (4) with its opening tongue (40), formed between two weakening segments (41).
  • FIG 4b similar to Figure 2a, there is shown a capsule (10) having a vertical tear strip (5) with its opening tongue (50), formed between two hgnes of afifaibhssement (51).
  • the tear strip extends over the entire height of the skirt (21).
  • FIG. 4c similar to Figure 2a, there is shown a capsule (10) having both a circular tear strip (4) and a vertical tear strip (5) extending from the bottom of the skirt (21 ) up to the height of said circular tear strip (4).
  • FIG. 4d is shown, by way of example, a capsule similar to that of FIG. 4b, but the capsule head of which is open (220), which makes it possible to position the opening tab (50 ) from the level of the head (22).
  • FIGS. 5 to 8 are axial half-sections of an example of a device intended to coat said blank (2) internally with said sleeve (31, 32), illustrating the steps of the corresponding method.
  • FIG. 5 represents a punch (6) comprising a central flaring core with a substantially frustoconical end (62) on which can slide a metallic expanding ring with spring effect (61) with frustoconical inner wall and substantially cylindrical outer wall - in the high position, as shown in Figure 5, said expandable ring
  • FIG. 5 corresponds to the first step of the method: a portion of tube (3) intended to form said sleeve (31, 32) is placed on said cylindrical elastomer ring
  • Figure 6 is shaped on said punch (6), by supplying hot air (7), a sleeve (30) with folded upper edge (300).
  • the capsule blank (2) is put in place.
  • the heating matrix 8 is actuated with a back-and-forth movement which results in:
  • FIG. 9 is a view in axial section of a capsule blank (2) used for the tests.
  • EUe has a skirt (21) whose opening area (210), at its upper part, is thinned.
  • FIG. 10 is a mixed view (in section on the right-hand side - front view on the left-hand side) of a capsule (10) consisting of a head (11) and a skirt (12), obtained from of the blank (2) of Figure 9, coated internally with a sleeve (32) on the upper half of its skirt.
  • Figure 10a is an enlarged sectional view of the connection area between head (11) and skirt (12).
  • Figure 11 is a schematic view of the device (13) for the industrial implementation of the method according to the invention in the case of an inner sleeve.
  • This device comprises a bariUet (130) typically rotating with 4 punches (6) and 4 stations marked from 1 to 4.
  • the tube portion (3) is supplied and placed on the punch (6), then the sleeve is formed by blowing hot air (7).
  • the capsule blank is positioned on the sleeve (30).
  • the heating matrix (8) is applied with a determined temperature, time and pressure.
  • the formed capsule (10) is ejected.
  • the device (13) can include other complementary positions.
  • the capsule (10) according to the invention consists of a capsule blank (2) and a sleeve (30) - only this reference will be used when it is a sleeve considered generically, otherwise, other marks (31,32,33,34) will be used for specific sleeves.
  • Said capsule blank (2) constitutes said metallic wall.
  • Said metal wall includes both the case of a metal wall in the strict sense, and of a metal wall depending on whether the starting material (1) is a metal strip or sheet, typically aluminum, or a multilayer material comprising a metallic layer and at least one plastic layer.
  • said sleeve (30) can be either inside or outside of said skirt - the words “inside” and “outside” being taken with respect to the metallic wall of the capsule blank ( 2). Indeed, the functions exerted by the sleeve and the results obtained are not linked to this positioning criterion.
  • said sleeve (30) is inside said skirt.
  • the thickness of said sleeve (30) is between 0.3 times and 3 times the thickness of said metal wall of said opening area.
  • said sleeve in order for the problems according to the invention to be resolved, it is necessary for said sleeve to have a sufficient thickness, equal to at least 0.3 times the thickness of said metallic wall. Furthermore, an excess thickness of said excessively thick sleeve, beyond 3 times the thickness of said metallic wall, would no longer serve to solve the problems posed.
  • the thickness of said sleeve is between 0.6 and 1.7 times the thickness of said metal wall.
  • said metal wall comprises a layer of aluminum or aluminum strip, preferably of low alloy (typically of the 1000 series), in the annealed state, and of average thickness between 30 and 100 ⁇ m, and can possibly include a layer of plastic material of average thickness between 20 and 100 ⁇ m, when the starting material (1) is a metaUoplastic material.
  • low alloy typically of the 1000 series
  • plastic material typically of average thickness between 20 and 100 ⁇ m
  • the average thickness of said metal wall is preferably between 50 and 80 ⁇ m, so that the capsule can be crimped without form folds.
  • said plastic material of said sleeve (30) is chosen from films of thermoplastic material or varnishes comprising a thermoplastic material or cellular varnishes loaded or not with a blowing agent.
  • Said film of thermoplastic material which may be monolayer or multilayer, may comprise a layer which can be cold squeezed or thermosceUable to said skirt (21).
  • Said heat-sealable layer comprises a polyolefin polymer or copolymer having acid groups or functions, in hbre or salified form (for example the ionomer resins), ensuring adhesion to a metallic wall, in particular an aluminum or aluminum alloy wall.
  • said plastic film of said sleeve can be made adherent to said skirt by means of a layer of adhesive, which is deposited at the time of assembly of said sleeve (30) and said blank (2).
  • said sleeve can also be obtained by direct injection or stamping of plastic material inside or outside of said blank.
  • said plastic material of said sleeve (30) can comprise at least one of the following elements: a) coloring in the mass of said plastic material, b) surface printing or, optionally, between the layers in the case of a multilayer film , c) incorporating into said plastic additive identifiers constituting a means of combating theft of fraud or counterfeiting, d) additional external layer allowing adhesion to the neck of said container, so as to prevent any fraudulent removal of said capsule without destroying it.
  • the capsules according to the invention may include means intended to facilitate the first opening (4,40,41 , 5,50,51), as illustrated in FIGS. 4a, 4b, 4c and 10.
  • the capsules corresponding to the blanks (2) for example as illustrated in FIG. 9, had to have a thinned wall in the area d opening (210) for opening with a knife by cutting. The Applicant has observed that this same capsule could therefore no longer be provided with a tear strip - except to take a very wide strip, which is, moreover, unattractive.
  • the capsules according to the invention can therefore either be used as tUes for opening with a knife, but with a lower risk of injury, or be provided with means intended to facilitate the first opening, and this without U either need to modify the specifications of the capsules, in particular the thickness of the metal wall.
  • Another object of the invention is constituted by the method of manufacturing a capsule according to the invention.
  • step a) all the treatments which would be liable to damage said sleeve (30), in particular the heat treatments, including the operations which may require heat treatments such as the decoration of the capsules, which would be to be reheated at a temperature higher than the melting temperature of said sleeve.
  • step b) where said blank (2) is coated with said sleeve (30), to ensure all or part of said shaping or said completion of step c), for example to form a relief on the head (11) of the capsule (10), or deposit a tax stamp.
  • said sleeve (30) is disposed inside said capsule.
  • said sleeve (30) preferably consists of a plastic film, which is applied inside said blank (2):
  • the Applicant has found it particularly advantageous according to the invention to shape said sleeve (30) on said punch (6) by simple blowing of hot air, as illustrated in FIGS. 5 and 6, by choosing to form said sleeve (30).
  • a tubular film obtained by extrusion blow molding so that, taking into account the memory effect of the film, the end of the tube portion (3) folds down automatically on the head of the punch (6) the action of heat.
  • said punch (6) comprises means (61, 62) allowing its radial expansion, so as to press said sleeve (30) against said blank (2) with sufficient pressure to ensure adhesion of said sleeve to said draft.
  • a concrete method of such a punch (6) is described in Figures 5 to 8.
  • the heating matrix is at 200-300 ° C, preferably between 220 and 260 ° C, and it is applied for a time between 0.1 and 1.5 s, and preferably for 0.5 to 0, 9s.
  • the pressure exerted on said sleeve against said blank (2) it should preferably be at least equal to 0.1 daN / mm 2 , and preferably at least equal to 0, 15 daN / mm 2 .
  • said sleeve (30) is preferably a heat-shrinkable film which is pressed outside said blank
  • FIGS. 5 to 8 Another object of the invention is constituted by the device for implementing the method according to the invention in the case where said sleeve (30) is pressed inside said blank.
  • This device is illustrated in FIGS. 5 to 8 and 11. It comprises a punch (6) and a heating matrix (8), said punch comprising a radially expandable ring following an axial compression between said punch (6) and said matrix (8), so as to press said sleeve (30) against said blank (2).
  • the axial pressure between die (8) and punch (6) is transformed into radial pressure, taking into account the flaring core (62) of frustoconical shape.
  • a roll of EAA / LDPE film 29 mm in diameter and 90 ⁇ m thick was supplied, comprising a layer of 30 ⁇ m of EAA and 60 ⁇ m of LDPE, formed by coextrusion blow molding.
  • the blanks (2) having their final height were supplied.
  • the heating matrix (8) is apphed at a temperature of 240 ° C. for
  • Capsules according to the invention identical to those of Example 1, were manufactured, with in addition a tear strip (4) as shown in FIG. 10, since more specifically intended for the overcapping of bottles of alcohols.
  • This strip had a width of 6 mm.
  • the capsules of trial 1 were compared to the blank capsules (2).
  • the capsules in Trial 2 were compared to Softgard ® tin capsules with the same tear strip.
  • the comparison of the capsules was carried out with users according to a determined protocol comprising the opening of 15 bottles provided with capsules under code name and in the presence of a person responsible for observing in detail all the significant facts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

The invention concerns a metallic cap (10) for closure or overcap closure of a container, with a top (11) and a skirt (12) comprising a metallic wall, with an opening zone to be broken when it is first opened. The invention is characterised in that said cap (10) comprises a plastic sleeve (30, 31, 32, 33, 34) adhering to said metallic wall in the part of said cap corresponding to said opening zone.

Description

CAPSULE A MANCHON EN MATIERE PLASTIQUEPLASTIC SLEEVE CAPSULE
DOMAINE DE L'INVENTIONFIELD OF THE INVENTION
L'invention concerne le domaine des capsules, et plus particulièrement celui des capsules métalliques de bouchage et surbouchage.The invention relates to the field of capsules, and more particularly that of metal caps for capping and overcapping.
Les capsules de surbouchage, appliquées sur des goulots de récipients munis d'un bouchon, sont destinées, outre leur effet décoratif certain, notamment à garantir l'inviolabilité des récipients.Overcapping capsules, applied to the necks of containers fitted with a stopper, are intended, in addition to their certain decorative effect, in particular to guarantee the inviolability of the containers.
Ces capsules de surbouchage sont éventuellement munies de moyens de première ouverture facile (lignes d'affaiblissements, languettes détachables, etc.), sinon la tête de capsule est découpée au couteau, afin que le récipient puisse être ensuite débouché.These overcapping capsules are optionally provided with easy first opening means (weakening lines, detachable tabs, etc.), otherwise the capsule head is cut with a knife, so that the container can then be uncorked.
ETAT DE LA TECHNIQUESTATE OF THE ART
On connaît déjà de nombreuses capsules métalliques de surbouchage, notamment celles décrites dans les brevets qui suivent, au nom de la demanderesse : - dans le brevet européen EP-B 1-363 285, est décrite une capsule de surbouchage en aluminium à découpage facile, qui présente un jonc ou nervure périphérique, de manière à permettre le guidage d'une lame pour le découpage de la capsule lors de la première ouverture.Numerous metal overcap capsules are already known, in particular those described in the following patents, in the name of the applicant: - in European patent EP-B 1 363 285, an aluminum overcap capsule with easy cutting is described, which has a ring or peripheral rib, so as to allow the guiding of a blade for cutting the capsule during the first opening.
- dans le brevet français FR-B1-2 636 257, est décrite une capsule métallique ayant une ligne de déchirement non coupante obtenue par une succession de reliefs et de creux transversaux.- In French patent FR-B1-2 636 257, a metal capsule is described having a non-cutting tear line obtained by a succession of reliefs and transverse hollows.
- de même dans le brevet français FR-B1-2 657 031, est décrite une capsule en aluminium à ligne de déchirement non coupante grâce à une succession de reliefs et de creux alternés. - enfin dans le brevet français FR-B1-2 665 887, est décrite une capsule de surbouchage pouvant être découpée sans risque de blessures. Cette capsule est fabriquée à partir d'un matériau multicouche constitué de deux couches d'aluminium liées entre elles par une couche adhésive de dureté Shore inférieure à 80.- similarly in French patent FR-B1-2 657 031, an aluminum capsule with a non-cutting tear line is described thanks to a succession of alternating reliefs and hollows. - Finally, in French patent FR-B1-2 665 887, an overcap capsule can be described which can be cut without risk of injury. This capsule is made from a multilayer material consisting of two layers of aluminum bonded together by an adhesive layer of Shore hardness less than 80.
PROBLEME POSEPROBLEM
D. est demandé aux produits manufacturés un niveau de plus en plus élevé de sécurité d'utilisation. C'est la cas aussi des capsules métalliques de bouchage et de surbouchage, bien que, découpées de manière correcte, elles présentent très peu de risques de blesser le consommateur par coupure due à la tranche métallique formée lors de la première ouverture. Cependant, il convient que les produits manufacturés prennent en compte les risques qui peuvent augmenter dans le cas d'un consommateur qui procéderait à un découpage de capsule selon une méthode peu académique ou en étant distrait.D. manufactured products are asked for an increasingly high level of safety in use. This is also the case with metal caps for capping and overcapping, although, cut correctly, they present very little risk of injuring the consumer by cutting due to the metal wafer formed during the first opening. However, manufactured products should take into account the risks which may increase in the case of a consumer who cuts the capsule using an unconventional method or who is distracted by it.
Déjà dans le passé, comme mentionné dans l'état de la technique, diverses tentatives ont été faites pour résoudre ce problème. Dans le cas de capsules de surbouchage non dotées de moyens de première ouverture facile, on sait par le brevet français FR-B1-2 665 887, qu'une capsule de surbouchage fabriquée à partir d'un matériau multicouche constitué de deux couches d'aluminium liées entre elles par une couche adhésive de dureté Shore inférieure à 80, peut être découpée sans risque de blessures.Already in the past, as mentioned in the prior art, various attempts have been made to resolve this problem. In the case of overcap capsules not provided with means of easy first opening, it is known from French patent FR-B1-2 665 887 that an overcap capsule manufactured from a multilayer material consisting of two layers of aluminum bonded together by an adhesive layer of Shore hardness less than 80, can be cut without risk of injury.
Cette solution n'a pas été développée commercialement à cause du coût de fabrication nettement plus élevé, compte tenu du coût initial du matériau multicouche du type M P/M, où M désigne une couche métallique d'aluminium, et P désigne une couche de matière adhésive.This solution was not developed commercially because of the significantly higher manufacturing cost, taking into account the initial cost of the multilayer material of the MP / M type, where M denotes a metallic layer of aluminum, and P denotes a layer of material. adhesive.
Le problème à résoudre est d'une part d'obtenir des capsules qui soient à la fois non coupantes après découpage au couteau, et d'un prix de revient peu élevé. En outre, il importe que ces capsules ressemblent par leur toucher, par leur malléabilité, par la sonorité quand elles entrent au contact d'autres objets, aux capsules en plomb- étain, maintenant généralement interdites par les législations nationales, et dont l'image « haut de gamme » est toujours recherchée par le consommateur. Enfin, la demanderesse a cherché à mettre au point une capsule qui puisse, éventuellement, être dotée de moyens d'ouverture facile, lors de la première ouverture par le consommateur, de manière à ce qu'une même ligne de fabrication puisse, au choix, conduire à des capsules ouvrables soit par découpe au couteau, soit en tirant typiquement sur une languette ou bande de déchirement.The problem to be solved is on the one hand to obtain capsules which are both non-cutting after cutting with a knife, and a low cost price. In addition, it is important that these capsules resemble by their touch, by their malleability, by the sound when they come into contact with other objects, the lead-tin capsules, now generally prohibited by national laws, and whose image "High end" is always sought after by the consumer. Finally, the plaintiff has sought to develop a capsule which can, optionally, be provided with easy opening means, during the first opening by the consumer, so that the same production line can, as desired , lead to capsules that can be opened either by cutting with a knife, or by typically pulling on a tear strip or strip.
DESCRIPTION DE L'INVENTIONDESCRIPTION OF THE INVENTION
Selon l'invention, la capsule métaUique de bouchage ou de surbouchage d'un récipient, ayant une tête et une jupe comprenant une paroi métaUique, ayant une zone d'ouverture destinée à être rompue lors d'une première ouverture, caractérisée en ce que ladite capsule comprend un manchon en matière plastique adhérant à ladite paroi métaUique dans la partie de ladite capsule correspondant à ladite zone d'ouverture.According to the invention, the metal capsule for capping or overcapping a container, having a head and a skirt comprising a metal wall, having an opening zone intended to be broken during a first opening, characterized in that said capsule comprises a plastic sleeve adhering to said metallic wall in the part of said capsule corresponding to said opening zone.
La demanderesse a eu la surprise de constater que la solution proposée permettait de résoudre simultanément l'ensemble des problèmes posés, qu'U s'agisse de diminuer les risques de blessure, d'améliorer le « toucher » des capsules, ou de permettre l'adjonction de moyens de première ouverture facile.The Applicant was surprised to find that the proposed solution made it possible to simultaneously solve all of the problems posed, whether U was to reduce the risk of injury, improve the "feel" of the capsules, or allow the 'adding easy first opening means.
Généralement, ladite zone d'ouverture comprend la partie supérieure de la jupe - ceUe qui est proche de ladite tête - généralement située au niveau de la bague de verrerie dans le cas où le récipient est une bouteUle. Mais, eUe peut comprendre aussi l'extrémité de ladite jupe, jusqu'à l'angle formé par la jupe et la tête, dans la mesure où certains consommateurs découpent au couteau seulement la tête de la capsule.Generally, said opening zone comprises the upper part of the skirt - that which is close to said head - generally located at the level of the glass ring in the case where the container is a bottle. However, it can also include the end of said skirt, up to the angle formed by the skirt and the head, insofar as certain consumers cut only the head of the capsule with a knife.
En conséquence, selon l'invention, ladite jupe est recouverte par ledit manchon sur une hauteur correspondant au moins à ceUe de ladite zone d'ouverture.Consequently, according to the invention, said skirt is covered by said sleeve over a height corresponding at least to ceUe of said opening zone.
DESCRIPTION DES FIGURES La figure 1 schématise la formation d'une ébauche de capsule (2) à partir d'un matériau en bobine (1), qui peut être une bande d'aluminium, de matériau multicouche comprenant une couche d'aluminium.DESCRIPTION OF THE FIGURES Figure 1 shows schematically the formation of a capsule blank (2) from a coil material (1), which can be an aluminum strip, of multilayer material comprising an aluminum layer.
Ladite ébauche (2), qui peut être formée par tout procédé connu, typiquement par emboutissage et étirage, par coUage, présente une jupe (21) et une tête (22).Said blank (2), which can be formed by any known method, typically by stamping and drawing, by coUage, has a skirt (21) and a head (22).
Ladite ébauche (2) est représentée en demi-coupe axiale, l'axe (9) étant un axe de symétrie cylindrique. La même représentation a été utilisée pour les figures 2a à 4c.Said blank (2) is shown in axial half-section, the axis (9) being an axis of cylindrical symmetry. The same representation was used for Figures 2a to 4c.
Les figures 2a à 4c représentent en demi-coupe axiale des capsules (10) selon l'invention.Figures 2a to 4c show in axial half-section capsules (10) according to the invention.
Sur les figures 2a et 2b, le manchon (31,32) est à l'intérieur de ladite ébauche (2). Sur la figure 2a, ledit manchon (31) revêt la jupe (21) sur toute sa hauteur, alors que sur la figure 2b, ledit manchon (32) ne revêt la jupe (21) que sur la zone d'ouverture.In FIGS. 2a and 2b, the sleeve (31,32) is inside said blank (2). In FIG. 2a, said sleeve (31) covers the skirt (21) over its entire height, while in FIG. 2b, said sleeve (32) only covers the skirt (21) over the opening area.
Sur les figures 3a et 3b, le manchon (33,34) est à l'extérieur de ladite ébauche (2). Sur la figure 3a, ledit manchon (33) revêt la jupe (21) sur toute sa hauteur, alors que sur la figure 3b, ledit manchon (34) ne revêt la jupe (21) que sur la zone d'ouverture.In Figures 3a and 3b, the sleeve (33,34) is outside of said blank (2). In FIG. 3a, said sleeve (33) covers the skirt (21) over its entire height, while in FIG. 3b, said sleeve (34) only covers the skirt (21) over the opening zone.
Sur la figure 4a, analogue à la figure 2b, on a représenté une capsule (10) ayant une bande de déchirement circulaire (4) avec sa languette d'ouverture (40), formée entre deux hgnes d'affaiblissement (41).In Figure 4a, similar to Figure 2b, there is shown a capsule (10) having a circular tear strip (4) with its opening tongue (40), formed between two weakening segments (41).
Sur la figure 4b, analogue à la figure 2a, on a représenté une capsule (10) ayant une bande de déchirement verticale (5) avec sa languette d'ouverture (50), formée entre deux hgnes d'afifaibhssement (51). La bande de déchirement s'étend sur toute la hauteur de la jupe (21).In Figure 4b, similar to Figure 2a, there is shown a capsule (10) having a vertical tear strip (5) with its opening tongue (50), formed between two hgnes of afifaibhssement (51). The tear strip extends over the entire height of the skirt (21).
Sur la figure 4c, analogue à la figure 2a, on a représenté une capsule (10) ayant à la fois une bande de déchirement circulaire (4) et une bande de déchirement verticale (5) s' étendant du bas de la jupe (21) jusqu'à la hauteur de ladite bande de déchirement circulaire (4). Sur la figure 4d, est représentée, à titre d'exemple, une capsule analogue à ceUe de la figure 4b, mais dont la tête de capsule est à ciel ouvert (220), ce qui permet de positionner la languette d'ouverture (50) à partir du niveau de la tête (22).In Figure 4c, similar to Figure 2a, there is shown a capsule (10) having both a circular tear strip (4) and a vertical tear strip (5) extending from the bottom of the skirt (21 ) up to the height of said circular tear strip (4). In FIG. 4d is shown, by way of example, a capsule similar to that of FIG. 4b, but the capsule head of which is open (220), which makes it possible to position the opening tab (50 ) from the level of the head (22).
Les figures 5 à 8 sont des demi-coupes axiales d'un exemple de dispositif destiné à revêtir intérieurement ladite ébauche (2) avec ledit manchon (31,32), iUustrant les étapes du procédé correspondant.FIGS. 5 to 8 are axial half-sections of an example of a device intended to coat said blank (2) internally with said sleeve (31, 32), illustrating the steps of the corresponding method.
La figure 5 représente un poinçon (6) comprenant un noyau évaseur central à extrémité sensiblement tronconique (62) sur lequel peut glisser une bague expansible métaUique à effet ressort (61) à paroi intérieure tronconique et à paroi extérieure sensiblement cylindrique - en position haute, comme représenté à la figure 5, ladite bague expansibleFIG. 5 represents a punch (6) comprising a central flaring core with a substantially frustoconical end (62) on which can slide a metallic expanding ring with spring effect (61) with frustoconical inner wall and substantially cylindrical outer wall - in the high position, as shown in Figure 5, said expandable ring
(61) étant revêtue d'une bague cylindrique (60) en élastomère.(61) being coated with a cylindrical ring (60) made of elastomer.
La figure 5 correspond à la première étape du procédé : une portion de tube (3) destinée à former ledit manchon (31,32) est placée sur ladite bague cylindrique en élastomèreFIG. 5 corresponds to the first step of the method: a portion of tube (3) intended to form said sleeve (31, 32) is placed on said cylindrical elastomer ring
(60), son rebord supérieur dépassant de quelques millimètres.(60), its upper edge projecting a few millimeters.
A la figure 6, on met en forme sur ledit poinçon (6), par apport d'air chaud (7), un manchon (30) à rebord supérieur rabattu (300).In Figure 6, is shaped on said punch (6), by supplying hot air (7), a sleeve (30) with folded upper edge (300).
A la figure 7, on met en place l'ébauche de capsule (2). A la figure 8, on actionne la matrice chauffante 8 d'un mouvement de va-et-vient qui se traduit par :In FIG. 7, the capsule blank (2) is put in place. In FIG. 8, the heating matrix 8 is actuated with a back-and-forth movement which results in:
- l'écartement de la bague cylindrique en élastomère (60), et le placage du manchon (30) contre la surface intérieure correspondante de ladite ébauche (2),- the spacing of the elastomeric cylindrical ring (60), and the plating of the sleeve (30) against the corresponding interior surface of said blank (2),
- le transfert de calories, au travers de ladite ébauche (2), nécessaire et suffisant pour thermosceUer ledit manchon (30) à ladite ébauche (2) et former ainsi une capsule (10) comprenant une ébauche de capsule (2) revêtue intérieurement d'un manchon (32).- the transfer of calories, through said blank (2), necessary and sufficient to thermosceUer said sleeve (30) to said blank (2) and thus form a capsule (10) comprising a capsule blank (2) coated internally with 'a sleeve (32).
La figure 9 est une vue en coupe axiale d'une ébauche de capsule (2) utilisée pour les essais. EUe présente une jupe (21) dont la zone d'ouverture (210), à sa partie supérieure, est amincie. La figure 10 est une vue mixte (en coupe sur la partie droite - vue de face sur la partie gauche) d'une capsule (10) constituée d'une tête (11) et d'une jupe (12), obtenue à partir de l'ébauche (2) de la figure 9, revêtue intérieurement d'un manchon (32) sur la moitié supérieure de sa jupe. La figure 10a est une vue en coupe agrandie de la zone de raccordement entre tête (11) et jupe (12).FIG. 9 is a view in axial section of a capsule blank (2) used for the tests. EUe has a skirt (21) whose opening area (210), at its upper part, is thinned. FIG. 10 is a mixed view (in section on the right-hand side - front view on the left-hand side) of a capsule (10) consisting of a head (11) and a skirt (12), obtained from of the blank (2) of Figure 9, coated internally with a sleeve (32) on the upper half of its skirt. Figure 10a is an enlarged sectional view of the connection area between head (11) and skirt (12).
La figure 11 est une vue schématique du dispositif (13) pour la mise en oeuvre industrieUe du procédé selon l'invention dans le cas d'un manchon intérieur. Ce dispositif comprend un bariUet (130) tournant à typiquement 4 poinçons (6) et 4 postes notés de 1 à 4.Figure 11 is a schematic view of the device (13) for the industrial implementation of the method according to the invention in the case of an inner sleeve. This device comprises a bariUet (130) typically rotating with 4 punches (6) and 4 stations marked from 1 to 4.
Au poste 1, est approvisionné et placé la portion de tube (3) sur le poinçon (6), puis manchon est formé par soufflage d'air chaud (7).At station 1, the tube portion (3) is supplied and placed on the punch (6), then the sleeve is formed by blowing hot air (7).
Au poste 2, l'ébauche de capsule est positionnée sur le manchon (30). Au poste 3, la matrice chauffante (8) est apphquée avec une température, un temps et une pression déterminées.At station 2, the capsule blank is positioned on the sleeve (30). At station 3, the heating matrix (8) is applied with a determined temperature, time and pressure.
Au poste 4, la capsule formée (10) est éjectée.At station 4, the formed capsule (10) is ejected.
Le dispositif (13) peut comprendre d'autres postes complémentaires.The device (13) can include other complementary positions.
DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION
La capsule (10) selon l'invention est constituée d'une ébauche de capsule (2) et d'un manchon (30) - seul ce repère sera utilisé quand il s'agira d'un manchon considéré de manière générique, sinon, d'autres repères (31,32,33,34) seront utilisés pour des manchons spécifiques.The capsule (10) according to the invention consists of a capsule blank (2) and a sleeve (30) - only this reference will be used when it is a sleeve considered generically, otherwise, other marks (31,32,33,34) will be used for specific sleeves.
Ladite ébauche de capsule (2) constitue ladite paroi métaUique. Ladite paroi métaUique englobe à la fois le cas d'une paroi métaUique au sens strict, et d'une paroi métaUoplastique selon que le matériau de départ (1) est une bande ou feuiUe métaUique, typiquement en aluminium, ou un matériau multicouche comprenant une couche métaUique et au moins une couche de matière plastique. Selon l'invention, ledit manchon (30) peut être soit à l'intérieur soit à l'extérieur de ladite jupe - les mots « intérieur » et « extérieur » étant pris par rapport à la paroi métaUique de l'ébauche de capsule (2). En effet, les fonctions exercées par le manchon et les résultats obtenus ne sont pas liés à ce critère de positionnement. De préférence, ledit manchon (30) est à l'intérieur de ladite jupe.Said capsule blank (2) constitutes said metallic wall. Said metal wall includes both the case of a metal wall in the strict sense, and of a metal wall depending on whether the starting material (1) is a metal strip or sheet, typically aluminum, or a multilayer material comprising a metallic layer and at least one plastic layer. According to the invention, said sleeve (30) can be either inside or outside of said skirt - the words “inside” and “outside” being taken with respect to the metallic wall of the capsule blank ( 2). Indeed, the functions exerted by the sleeve and the results obtained are not linked to this positioning criterion. Preferably, said sleeve (30) is inside said skirt.
L'épaisseur dudit manchon (30) est comprise entre 0,3 fois et 3 fois l'épaisseur de ladite paroi métaUique de ladite zone d'ouverture. En effet, pour que les problèmes selon l'invention soient résolus, U faut que ledit manchon ait une épaisseur suffisante, égale au moins à 0,3 fois l'épaisseur de ladite paroi métaUique. Par aiUeurs, une surépaisseur dudit manchon trop épais, au-delà de 3 fois l'épaisseur de ladite paroi métaUique, ne servirait plus à résoudre les problèmes posés.The thickness of said sleeve (30) is between 0.3 times and 3 times the thickness of said metal wall of said opening area. In fact, in order for the problems according to the invention to be resolved, it is necessary for said sleeve to have a sufficient thickness, equal to at least 0.3 times the thickness of said metallic wall. Furthermore, an excess thickness of said excessively thick sleeve, beyond 3 times the thickness of said metallic wall, would no longer serve to solve the problems posed.
De préférence, l'épaisseur dudit manchon est compris entre 0,6 et 1,7 fois l'épaisseur de ladite paroi métaUique.Preferably, the thickness of said sleeve is between 0.6 and 1.7 times the thickness of said metal wall.
De préférence, ladite paroi métaUique comprend une couche d'aluminium ou alhage d'aluminium, de préférence faiblement allié (typiquement de la série 1000), à l'état recuit, et d'épaisseur moyenne comprise entre 30 et 100 μm, et peut comprendre éventueUement une couche de matière plastique d'épaisseur moyenne comprise entre 20 et 100 μm, lorsque le matériau de départ (1) est un matériau métaUoplastique.Preferably, said metal wall comprises a layer of aluminum or aluminum strip, preferably of low alloy (typically of the 1000 series), in the annealed state, and of average thickness between 30 and 100 μm, and can possibly include a layer of plastic material of average thickness between 20 and 100 μm, when the starting material (1) is a metaUoplastic material.
Que ce soit dans le cas d'une paroi métaUique au sens strict ou d'une paroi métaUoplastique, l'épaisseur moyenne de ladite paroi métaUique est de préférence comprise entre 50 et 80 μm, de manière à ce que la capsule puisse être sertie sans former de plis.Whether in the case of a metal wall in the strict sense or of a metal wall, the average thickness of said metal wall is preferably between 50 and 80 μm, so that the capsule can be crimped without form folds.
Selon l'invention, ladite matière plastique dudit manchon (30) est choisie parmi les films en matière thermoplastique ou les vernis comprenant une matière thermoplastique ou les vernis alvéolaires chargés ou non d'un agent porogène.According to the invention, said plastic material of said sleeve (30) is chosen from films of thermoplastic material or varnishes comprising a thermoplastic material or cellular varnishes loaded or not with a blowing agent.
Ledit film en matière thermoplastique, qui peut être monocouche ou multicouche, peut comprendre une couche sceUable à froid ou thermosceUable à ladite jupe (21).Said film of thermoplastic material, which may be monolayer or multilayer, may comprise a layer which can be cold squeezed or thermosceUable to said skirt (21).
Ladite couche thermosceUable comprend un polymère ou copolymere polyoléfinique ayant des groupements ou fonctions acide, sous forme hbre ou salifiée (par exemple les résines ionomères), assurant l'adhérence à une paroi métaUique, notamment une paroi en aluminium ou alliage d'aluminium.Said heat-sealable layer comprises a polyolefin polymer or copolymer having acid groups or functions, in hbre or salified form (for example the ionomer resins), ensuring adhesion to a metallic wall, in particular an aluminum or aluminum alloy wall.
A titre d'exemples, on peut citer les films de Surlyn ®, les films coextrudés EAA/PE (LDPE), les films coextrudés Morprime ®/PP, les films OREVAC © /PE ou PP, etc.. Selon une autre modalité de l'invention, ledit film en matière plastique dudit manchon peut être rendu adhérent à ladite jupe grâce à une couche d'adhésif, que l'on dépose au moment de l'assemblage dudit manchon (30) et de ladite ébauche (2). Selon une autre modalité de l'invention, ledit manchon peut aussi être obtenu par injection directe ou matriçage de matière plastique à l'intérieur ou à l'extérieur de ladite ébauche.By way of examples, mention may be made of Surlyn® films, EAA / PE coextruded films (LDPE), Morprime® / PP coextruded films, OREVAC © / PE or PP films, etc. According to another method of the invention, said plastic film of said sleeve can be made adherent to said skirt by means of a layer of adhesive, which is deposited at the time of assembly of said sleeve (30) and said blank (2). According to another embodiment of the invention, said sleeve can also be obtained by direct injection or stamping of plastic material inside or outside of said blank.
Il peut être avantageux d'utiliser ledit manchon à des fins variées. Ainsi, ladite matière plastique dudit manchon (30) peut comprendre au moins un des éléments suivants : a) coloration dans la masse de ladite matière plastique, b) impression en surface ou, eventueUement, entre les couches dans le cas d'un film multicouche, c) incorporation dans ladite matière plastique d'additifs identificateurs constituant un moyen de lutte contre le voL la fraude ou la contrefaçon, d) couche supplémentaire externe permettant l'adhérence au goulot dudit récipient, de manière à empêcher tout enlèvement frauduleux de ladite capsule sans destruction de ceUe-ci.It may be advantageous to use said sleeve for various purposes. Thus, said plastic material of said sleeve (30) can comprise at least one of the following elements: a) coloring in the mass of said plastic material, b) surface printing or, optionally, between the layers in the case of a multilayer film , c) incorporating into said plastic additive identifiers constituting a means of combating theft of fraud or counterfeiting, d) additional external layer allowing adhesion to the neck of said container, so as to prevent any fraudulent removal of said capsule without destroying it.
Contrairement aux capsules de l'état de l'art, correspondant aux ébauches de capsules (2) et ne comprenant donc pas de manchon, les capsules selon l'invention peuvent comprendre des moyens destinés à faciliter la première ouverture (4,40,41,5,50,51), comme Ulustré aux figures 4a, 4b, 4c et 10. En effet, les capsules correspondant aux ébauches (2), par exemple comme illustré à la figure 9, devaient présenter une paroi amincie dans la zone d'ouverture (210) en vue de l'ouverture au couteau par découpe. La demanderesse a observé que cette même capsule ne pouvait plus dès lors être dotée d'une bande de déchirement - sauf à prendre une bande de grande largeur, au demeurant peu esthétique. En effet, compte tenu sans doute de la faible épaisseur relative du métal dans la zone d'ouverture, la bande de déchirement avait tendance à se rompre avant qu'eUe ait été tirée sur toute la circonférence. Les capsules selon l'invention peuvent donc soit être utilisées en tant que teUes en vue d'une ouverture au couteau, mais avec un risque moindre de blessure, soit être dotées de moyens destinés à faciliter la première ouverture, et cela sans qu'U soit besoin de modifier les spécifications des capsules, en particulier l'épaisseur de la paroi métaUique.Unlike the capsules of the state of the art, corresponding to the blanks of capsules (2) and therefore not comprising a sleeve, the capsules according to the invention may include means intended to facilitate the first opening (4,40,41 , 5,50,51), as illustrated in FIGS. 4a, 4b, 4c and 10. In fact, the capsules corresponding to the blanks (2), for example as illustrated in FIG. 9, had to have a thinned wall in the area d opening (210) for opening with a knife by cutting. The Applicant has observed that this same capsule could therefore no longer be provided with a tear strip - except to take a very wide strip, which is, moreover, unattractive. Indeed, probably taking into account the small relative thickness of the metal in the opening zone, the tear strip tended to break before it was pulled over the entire circumference. The capsules according to the invention can therefore either be used as tUes for opening with a knife, but with a lower risk of injury, or be provided with means intended to facilitate the first opening, and this without U either need to modify the specifications of the capsules, in particular the thickness of the metal wall.
Un autre objet de l'invention est constitué par le procédé de fabrication d'une capsule selon l'invention.Another object of the invention is constituted by the method of manufacturing a capsule according to the invention.
Dans le procédé selon l'invention, a) on forme d'abord une ébauche (2) de ladite capsule métaUique (10), par une succession d'étapes de mise en forme d'une bande (1) ou d'une feuiUe comprenant une couche métaUique, typiquement par emboutissage et étirage, de manière à ce que ladite ébauche présente au moins 50% de la hauteur finale de ladite capsule, b) ladite ébauche (2) est ensuite revêtue par ledit manchon (30), mis en forme au préalable, en faisant adhérer ledit manchon (30) à ladite ébauche (2), c) on poursuit eventueUement la mise en forme de ladite ébauche (2) si eUe était incomplète à l'issue de l'étape a), et son parachèvement, notamment la formation de moyens (4,40,41,5,50,51) destinés à faciliter ladite première ouverture.In the method according to the invention, a) first forming a blank (2) of said metal capsule (10), by a succession of steps for shaping a strip (1) or a sheet comprising a metallic layer, typically by stamping and drawing, so that said blank has at least 50% of the final height of said capsule, b) said blank (2) is then coated by said sleeve (30), put in form beforehand, by making said sleeve (30) adhere to said blank (2), c) possibly continuing the shaping of said blank (2) if it was incomplete at the end of step a), and its completion, in particular the formation of means (4,40,41,5,50,51) intended to facilitate said first opening.
Dans ce procédé, on peut réahser à l'étape a) tous les traitements qui seraient susceptibles d'endommager ledit manchon (30), notamment les traitements thermiques, y compris les opérations pouvant nécessiter des traitements thermiques comme la décoration des capsules, qui seraient à réahser à une température supérieure à la température de fusion dudit manchon.In this method, it is possible to repeat in step a) all the treatments which would be liable to damage said sleeve (30), in particular the heat treatments, including the operations which may require heat treatments such as the decoration of the capsules, which would be to be reheated at a temperature higher than the melting temperature of said sleeve.
Il est possible d'utiliser l'étape b), où on revêt ladite ébauche (2) dudit manchon (30), pour assurer tout ou partie de ladite mise en forme ou dudit parachèvement de l'étape c), par exemple pour former un relief sur la tête (11) de la capsule (10), ou déposer un timbre fiscal.It is possible to use step b), where said blank (2) is coated with said sleeve (30), to ensure all or part of said shaping or said completion of step c), for example to form a relief on the head (11) of the capsule (10), or deposit a tax stamp.
Selon une modalité préférée, ledit manchon (30) est disposé à l'intérieur de ladite capsule. Dans ce cas, ledit manchon (30) est constitué, de préférence, d'un film plastique, qui est appliqué à l'intérieur de ladite ébauche (2) :According to a preferred embodiment, said sleeve (30) is disposed inside said capsule. In this case, said sleeve (30) preferably consists of a plastic film, which is applied inside said blank (2):
- en plaçant ledit manchon (3) sur un poinçon (6),- by placing said sleeve (3) on a punch (6),
- puis en plaçant ladite ébauche (2) sur ledit manchon (30), eventueUement mis en forme, - en exerçant, grâce à une matrice chauffante (8), une pression et un transfert thermique de ladite matrice (8) vers ladite ébauche (2), puis vers ledit manchon (30), pendant un temps et à une température choisis de manière à assurer l'adhérence dudit manchon (30) à ladite ébauche (2), sans qu'iï y ait fusion dudit manchon (30) à l'interface entre celui-ci et ledit poinçon (6).- then by placing said blank (2) on said sleeve (30), optionally shaped, - by exerting, using a heating matrix (8), a pressure and a thermal transfer from said matrix (8) to said blank (2), then to said sleeve (30), for a time and at a temperature chosen so ensuring adhesion of said sleeve (30) to said blank (2), without there being fusion of said sleeve (30) at the interface between the latter and said punch (6).
Ce procédé est Ulustré aux figures 5 à 8.This process is illustrated in Figures 5 to 8.
La demanderesse a trouvé particulièrement avantageux selon l'invention de mettre en forme ledit manchon (30) sur ledit poinçon (6) par simple soufflage d'air chaud, comme Ulustré aux figures 5 et 6, en choisissant pour former ledit manchon (30) un film tubulaire obtenu par extrusion- soufflage en buUe, de manière à ce que, compte tenu de l'effet mémoire du film l'extrémité de la portion de tube (3) se rabatte automatiquement sur la tête du poinçon (6), sous l'action de la chaleur.The Applicant has found it particularly advantageous according to the invention to shape said sleeve (30) on said punch (6) by simple blowing of hot air, as illustrated in FIGS. 5 and 6, by choosing to form said sleeve (30). a tubular film obtained by extrusion blow molding, so that, taking into account the memory effect of the film, the end of the tube portion (3) folds down automatically on the head of the punch (6) the action of heat.
Il est avantageux que ledit poinçon (6) comprenne un moyen (61,62) permettant son expansion radiale, de manière à apphquer ledit manchon (30) contre ladite ébauche (2) avec une pression suffisante pour assurer l'adhérence dudit manchon à ladite ébauche. Une modalité concrète d'un tel poinçon (6) est décrite aux figures 5 à 8.It is advantageous that said punch (6) comprises means (61, 62) allowing its radial expansion, so as to press said sleeve (30) against said blank (2) with sufficient pressure to ensure adhesion of said sleeve to said draft. A concrete method of such a punch (6) is described in Figures 5 to 8.
D'une part, en ce qui concerne les conditions de pression, de température et de temps permettant d'assurer l'adhérence dudit manchon, convient d'avoir un couple temps- température tel qu'U y ait ramollissement dudit manchon, ou fusion à l'interface entre ledit manchon (30) et ladite ébauche (2), et cela, sans qu'U y ait fusion dudit manchon (30) à l'interface entre celui-ci et ledit poinçon (6). Typiquement, la matrice chauffante est à 200-300°C, de préférence entre 220 et 260°C, et eUe est apphquée pendant un temps compris entre 0,1 et 1,5 s, et de préférence pendant 0,5 à 0,9 s.On the one hand, with regard to the pressure, temperature and time conditions making it possible to ensure the adhesion of said sleeve, it is advisable to have a time-temperature couple such that there is softening of said sleeve, or fusion at the interface between said sleeve (30) and said blank (2), and this, without U there being fusion of said sleeve (30) at the interface between the latter and said punch (6). Typically, the heating matrix is at 200-300 ° C, preferably between 220 and 260 ° C, and it is applied for a time between 0.1 and 1.5 s, and preferably for 0.5 to 0, 9s.
D'autre part, en ce qui concerne la pression exercée sur ledit manchon contre ladite ébauche (2), eUe doit être, de préférence, au moins égale à 0,1 daN/mm2, et de préférence au moins égale à 0,15 daN/mm2.On the other hand, as regards the pressure exerted on said sleeve against said blank (2), it should preferably be at least equal to 0.1 daN / mm 2 , and preferably at least equal to 0, 15 daN / mm 2 .
On peut aussi, selon l'invention, apphquer ledit manchon (30) à l'extérieur de ladite ébauche, comme Ulustré aux figures 3a et 3b, et dans ce cas, ledit manchon (33,34) est de préférence un film thermorétractable qui est apphqué à l'extérieur de ladite ébaucheIt is also possible, according to the invention, to grip said sleeve (30) outside of said blank, as shown in FIGS. 3a and 3b, and in this case, said sleeve (33, 34) is preferably a heat-shrinkable film which is pressed outside said blank
(2).(2).
Un autre objet de l'invention est constitué par le dispositif pour mettre en oeuvre le procédé selon l'invention dans le cas où ledit manchon (30) est apphqué à l'intérieur de ladite ébauche. Ce dispositif est Ulustré aux figures 5 à 8 et 11. Il comprend un poinçon (6) et une matrice chauffante (8), ledit poinçon comprenant une bague expansible radialement à la suite d'une compression axiale entre ledit poinçon (6) et ladite matrice (8), de manière à apphquer ledit manchon (30) contre ladite ébauche (2). Avec le dispositif Ulustré aux figures 5 à 8, la pression axiale entre matrice (8) et poinçon (6) se transforme en pression radiale, compte tenu du noyau évaseur (62) de forme tronconique.Another object of the invention is constituted by the device for implementing the method according to the invention in the case where said sleeve (30) is pressed inside said blank. This device is illustrated in FIGS. 5 to 8 and 11. It comprises a punch (6) and a heating matrix (8), said punch comprising a radially expandable ring following an axial compression between said punch (6) and said matrix (8), so as to press said sleeve (30) against said blank (2). With the device illustrated in FIGS. 5 to 8, the axial pressure between die (8) and punch (6) is transformed into radial pressure, taking into account the flaring core (62) of frustoconical shape.
EXEMPLES DE REALISATIONEXAMPLES OF REALIZATION
EXEMPLE 1EXAMPLE 1
On a fabriqué des ébauches (2) en alliage d'aluminium de la série 1000 conformes à la figure 9 par emboutissage et étirage de bande aluminium de 100 μm d'épaisseur.We produced blanks (2) of aluminum alloy of the 1000 series in accordance with Figure 9 by stamping and drawing of aluminum strip 100 μm thick.
On a approvisionné un rouleau de film EAA/LDPE de 29 mm de diamètre et de 90 μm d'épaisseur, comprenant une couche de 30 μm d'EAA et de 60 μm de LDPE, formé par coextrusion soufflage en buUe.A roll of EAA / LDPE film 29 mm in diameter and 90 μm thick was supplied, comprising a layer of 30 μm of EAA and 60 μm of LDPE, formed by coextrusion blow molding.
On a utilisé le dispositif (13) décrit à la figure 11, et aux figures 5 à 8, en ce qui concerne le détaU de chaque étape :The device (13) described in FIG. 11, and in FIGS. 5 to 8, was used with regard to the detail of each step:
Au poste 1, on a formé, à partir du film EAA/LDPE des manchons (30) de 28 mm de hauteur, ayant un rabat (300) de 4 mm obtenu intantanément par soufflage d'air chaudAt station 1, sleeves (30) 28 mm high, having a flap (300) of 4 mm obtained instantaneously by blowing hot air, were formed from the EAA / LDPE film.
(7).(7).
Au poste 2, on a approvisionné les ébauches (2) ayant leur hauteur finale. Au poste 3, on apphqué la matrice chauffante (8) à une température de 240°C pendantAt station 2, the blanks (2) having their final height were supplied. At station 3, the heating matrix (8) is apphed at a temperature of 240 ° C. for
0,8 s et avec une force axiale de 300 daN convertie en effort radial (200 daN) sur une surface de manchon d'environ 1100 mm2 - soit environ une pression de 0,18 daN/mm2 . Au poste 4, les capsules selon l'invention ont été éjectées.0.8 s and with an axial force of 300 daN converted into radial force (200 daN) on a sleeve surface of approximately 1100 mm 2 - i.e. approximately a pressure of 0.18 daN / mm 2 . At station 4, the capsules according to the invention were ejected.
Ces capsules ont été utilisées pour le surbouchage de bouteUles de vin.These capsules have been used for overcapping wine bottles.
EXEMPLE 2EXAMPLE 2
Des capsules selon l'invention, identiques à ceUes de l'exemple 1, ont été fabriquées, avec en plus une bande de déchirement (4) comme représenté à la figure 10, car plus spécifiquement destinées au surbouchage de bouteUles d'alcools. Cette bande présentait une largeur de 6 mm.Capsules according to the invention, identical to those of Example 1, were manufactured, with in addition a tear strip (4) as shown in FIG. 10, since more specifically intended for the overcapping of bottles of alcohols. This strip had a width of 6 mm.
Résultats comparatifs :Comparative results:
Les capsules de l'essai 1 ont été comparées aux capsules ébauches (2).The capsules of trial 1 were compared to the blank capsules (2).
Les capsules de l'essai 2 ont été comparées à des capsules en étain Softgard ® dotées d'une même bande de déchirement. La comparaison des capsules a été réahsée auprès d'utihsateurs selon un protocole déterminé comprenant l'ouverture de 15 bouteUles dotées de capsules sous nom de code et en présence d'une personne chargée d'observer en détaU tous les faits marquants.The capsules in Trial 2 were compared to Softgard ® tin capsules with the same tear strip. The comparison of the capsules was carried out with users according to a determined protocol comprising the opening of 15 bottles provided with capsules under code name and in the presence of a person responsible for observing in detail all the significant facts.
H résulte de ces tests que ces capsules selon l'invention ont été jugées, tant sur leur facilité d'ouverture, que sur la sécurité de cette ouverture ou leur toucher, supérieures aux capsules de référence en surbouchage de vin où le produit de référence était l'ébauche eUe-même, et comparables aux capsules de référence en surbouchage d'alcools où le produit de référence était une capsule à base d' étain. It follows from these tests that these capsules according to the invention have been judged, as much on their ease of opening, as on the safety of this opening or their touch, superior to the reference capsules in overcapping of wine where the reference product was the blank itself, and comparable to the reference capsules in alcohol overcoating where the reference product was a tin-based capsule.

Claims

REVENDICATIONS
1. Capsule métaUique (10) de bouchage ou de surbouchage d'un récipient, ayant une tête (11) et une jupe (12) comprenant une paroi métaUique, ayant une zone d'ouverture destinée à être rompue lors d'une première ouverture, caractérisée en ce que ladite capsule (10) comprend un manchon (30,31,32,33,34) en matière plastique adhérant à ladite paroi métaUique dans la partie de ladite capsule correspondant à ladite zone d'ouverture.1. Metallic capsule (10) for capping or overcapping a container, having a head (11) and a skirt (12) comprising a metallic wall, having an opening zone intended to be broken during a first opening , characterized in that said capsule (10) comprises a sleeve (30,31,32,33,34) of plastic material adhering to said metallic wall in the part of said capsule corresponding to said opening area.
2. Capsule selon la revendication 1 dans laqueUe ladite jupe (21) est recouverte par ledit manchon (30) sur une hauteur correspondant au moins à ceUe de ladite zone d'ouverture.2. Capsule according to claim 1 in laqueUe said skirt (21) is covered by said sleeve (30) over a height corresponding at least to ceUe of said opening area.
3. Capsule selon une quelconque des revendications 1 à 2 dans laqueUe ledit manchon (30) est à l'intérieur de ladite jupe.3. Capsule according to any one of claims 1 to 2 in laqueUe said sleeve (30) is inside said skirt.
4. Capsule selon une quelconque des revendications 1 à 3 dans laqueUe l'épaisseur dudit manchon (30) est comprise entre 0,3 fois et 3 fois l'épaisseur de ladite paroi métaUique de ladite zone d'ouverture.4. Capsule according to any one of claims 1 to 3 in laqueUe the thickness of said sleeve (30) is between 0.3 times and 3 times the thickness of said metal wall of said opening area.
5. Capsule selon la revendication 4 dans laqueUe ladite paroi métaUique comprend une couche d'aluminium ou alliage d'aluminium, à l'état recuit, et d'épaisseur moyenne comprise entre 30 et 100 μm, et eventueUement une couche de matière plastique d'épaisseur moyenne comprise entre 20 et 100 μm.5. A capsule according to claim 4 in which said metallic wall comprises a layer of aluminum or aluminum alloy, in the annealed state, and of average thickness between 30 and 100 μm, and optionally a layer of plastic material. '' average thickness between 20 and 100 μm.
6. Capsule selon une quelconque des revendications 1 à 5 dans laqueUe ladite matière plastique dudit manchon (30) est choisie parmi les films en matière thermoplastique ou les vernis comprenant une matière thermoplastique.6. Capsule according to any one of claims 1 to 5 in laqueUe said plastic material of said sleeve (30) is chosen from films of thermoplastic material or varnishes comprising a thermoplastic material.
7. Capsule selon la revendication 6 dans laqueUe ledit film en matière thermoplastique, qui peut être monocouche ou multicouche, comprend une couche sceUable à froid ou thermosceUable à ladite jupe. 7. Capsule according to claim 6 in laqueUe said film of thermoplastic material, which can be monolayer or multilayer, comprises a layer sceUable cold or thermosceUable to said skirt.
8. Capsule selon la revendication 6 dans laqueUe ledit film en matière plastique est rendu adhérent à ladite jupe grâce à une couche d'adhésif.8. Capsule according to claim 6 in laqueUe said plastic film is made adherent to said skirt with a layer of adhesive.
9. Capsule selon la revendication 7 dans laqueUe ladite couche thermosceUable comprend un polymère ou copolymere polyoléfinique ayant des groupements ou fonctions acide, sous forme hbre ou salifiée, assurant l'adhérence à une paroi métaUique, notamment une paroi en aluminium ou alliage d'aluminium.9. Capsule according to claim 7 in which said thermosealable layer comprises a polyolefin polymer or copolymer having acid groups or functions, in hbre or salified form, ensuring adhesion to a metallic wall, in particular an aluminum or aluminum alloy wall .
10. Capsule selon une quelconque des revendications 6 à 9 dans laqueUe ladite matière plastique comprend au moins un des éléments suivants : a) coloration dans la masse de ladite matière plastique, b) impression en surface ou, eventueUement, entre les couches dans le cas d'un film multicouche, c) incorporation dans ladite matière plastique d'additifs identificateurs constituant un moyen de lutte contre le vol, la fraude ou la contrefaçon, d) couche supplémentaire externe permettant l'adhérence au goulot dudit récipient, de manière à empêcher tout enlèvement frauduleux de ladite capsule sans destruction de ceUe-ci.10. Capsule according to any one of claims 6 to 9 in which said plastic material comprises at least one of the following elements: a) coloring in the mass of said plastic material, b) surface printing or, optionally, between the layers in the case of a multilayer film, c) incorporation in said plastic material of additive identifiers constituting a means of combating theft, fraud or counterfeiting, d) additional external layer allowing adhesion to the neck of said container, so as to prevent any fraudulent removal of said capsule without destroying it.
11. Capsule selon une quelconque des revendications 1 à 10 comprenant des moyens destinés à faciliter la première ouverture (4,40,41,5,50,51).11. Capsule according to any one of claims 1 to 10 comprising means intended to facilitate the first opening (4,40,41,5,50,51).
12. Procédé de fabrication d'une capsule selon une quelconque des revendications 1 à 11 dans lequel, a) on forme d'abord une ébauche (2) de ladite capsule métaUique (10), par une succession d'étapes de mise en forme d'une bande (1) ou d'une feuiUe comprenant une couche métaUique, typiquement par emboutissage et éthage, de manière à ce que ladite ébauche présente au moins 50% de la hauteur finale de ladite capsule, b) ladite ébauche (2) est ensuite revêtue par ledit manchon (30), mis en forme au préalable, en faisant adhérer ledit manchon (30) à ladite ébauche (2), c) on poursuit eventueUement la mise en forme de ladite ébauche (2) si eUe était incomplète à l'issue de l'étape a), et son parachèvement, notamment la formation de moyens (4,40,41,5,50,51) destinés à faciliter ladite première ouverture. 12. A method of manufacturing a capsule according to any one of claims 1 to 11 wherein, a) first forming a blank (2) of said metaUic capsule (10), by a succession of shaping steps a strip (1) or a sheet comprising a metallic layer, typically by stamping and sintering, so that said blank has at least 50% of the final height of said capsule, b) said blank (2) is then coated by said sleeve (30), shaped beforehand, by making said sleeve (30) adhere to said blank (2), c) optionally continuing the shaping of said blank (2) if it were incomplete at the end of step a), and its completion, in particular the formation of means (4,40,41,5,50,51) intended to facilitate said first opening.
13. Procédé selon la revendication 12 dans lequel, on réahse à l'étape a) tous les traitements qui seraient susceptibles d'endommager ledit manchon (30), notamment les traitements thermiques, y compris les opérations pouvant nécessiter des traitements thermiques comme la décoration des capsules, qui seraient à réahser à une température supérieure à la température de fusion dudit manchon.13. The method of claim 12 wherein, rehase in step a) all treatments that would be likely to damage said sleeve (30), including heat treatments, including operations that may require heat treatments such as decoration capsules, which would be reahser at a temperature above the melting temperature of said sleeve.
14. Procédé selon la revendication 13 dans lequel on utilise l'étape b), où on revêt ladite ébauche (2) dudit manchon (30), pour assurer tout ou partie de ladite mise en forme ou dudit parachèvement de l'étape c).14. The method of claim 13 wherein step b) is used, where said blank (2) is coated with said sleeve (30), to ensure all or part of said shaping or said completion of step c) .
15. Procédé selon une quelconque des revendications 12 à 14 dans lequel ledit manchon (30) est constitué d'un film plastique, et est apphqué à l'intérieur de ladite ébauche (2) :15. Method according to any one of claims 12 to 14 in which said sleeve (30) consists of a plastic film, and is apprehended inside said blank (2):
- en plaçant ledit manchon (3) sur un poinçon (6),- by placing said sleeve (3) on a punch (6),
- puis en plaçant ladite ébauche (2) sur ledit manchon (30), eventueUement mis en forme, - en exerçant, grâce à une matrice chauffante (8), une pression et un transfert thermique de ladite matrice (8) vers ladite ébauche (2), puis vers ledit manchon (30), pendant un temps et à une température choisis de manière à assurer l'adhérence dudit manchon (30) à ladite ébauche (2), sans qu'U y ait fusion dudit manchon (30) à l'interface entre celui-ci et ledit poinçon (6).- then by placing said blank (2) on said sleeve (30), possibly shaped, - by exerting, thanks to a heating matrix (8), a pressure and a thermal transfer from said matrix (8) to said blank ( 2), then towards said sleeve (30), for a time and at a temperature chosen so as to ensure adhesion of said sleeve (30) to said blank (2), without U there being fusion of said sleeve (30) at the interface between the latter and said punch (6).
16. Procédé selon la revendication 15 dans lequel ledit poinçon (6) comprend un moyen (61,62) permettant son expansion radiale, de manière à apphquer ledit manchon (30) contre ladite ébauche (2) avec une pression suffissante pour assurer l'adhérence dudit manchon à ladite ébauche.16. The method of claim 15 wherein said punch (6) comprises means (61,62) for its radial expansion, so as to press said sleeve (30) against said blank (2) with sufficient pressure to ensure the adhesion of said sleeve to said blank.
17. Procédé selon une quelconque des revendications 12 à 14 dans lequel ledit manchon (33,34) est un film thermorétractable et est apphqué à l'extérieur de ladite ébauche (2).17. Method according to any one of claims 12 to 14 wherein said sleeve (33,34) is a heat-shrinkable film and is pressed outside of said blank (2).
18. Dispositif pour mettre en oeuvre le procédé selon une quelconque des revendications 15 à 17 comprenant un poinçon (6) et une matrice chauffante (8) dans lequel ledit poinçon comprend une bague expansible radialement à la suite d'une compression axiale entre ledit poinçon (6) et ladite matrice (8), de manière à apphquer ledit manchon (30) contre ladite ébauche (2). 18. Device for implementing the method according to any one of claims 15 to 17 comprising a punch (6) and a heating matrix (8) in which said punch comprises a ring which is radially expandable following an axial compression between said punch (6) and said die (8), so as to press said sleeve (30) against said blank (2).
EP98921561A 1997-04-21 1998-04-17 Cap with plastic sleeve Withdrawn EP0977692A1 (en)

Applications Claiming Priority (3)

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FR9705182 1997-04-21
FR9705182A FR2762304B1 (en) 1997-04-21 1997-04-21 PLASTIC SLEEVE CAPSULE
PCT/FR1998/000783 WO1998047785A1 (en) 1997-04-21 1998-04-17 Cap with plastic sleeve

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EP (1) EP0977692A1 (en)
JP (1) JP2001521475A (en)
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AU (1) AU736662B2 (en)
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CA (1) CA2290133A1 (en)
FR (1) FR2762304B1 (en)
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AU736662B2 (en) 2001-08-02
BR9808610A (en) 2000-05-23
CN1252770A (en) 2000-05-10
KR20010012077A (en) 2001-02-15
JP2001521475A (en) 2001-11-06
CA2290133A1 (en) 1998-10-29
AU7436798A (en) 1998-11-13
FR2762304A1 (en) 1998-10-23
IL132064A0 (en) 2001-03-19
US6301767B1 (en) 2001-10-16
FR2762304B1 (en) 1999-05-28

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