EP1009674B1 - Sealing metal cap with plastic insert - Google Patents

Sealing metal cap with plastic insert Download PDF

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Publication number
EP1009674B1
EP1009674B1 EP98924371A EP98924371A EP1009674B1 EP 1009674 B1 EP1009674 B1 EP 1009674B1 EP 98924371 A EP98924371 A EP 98924371A EP 98924371 A EP98924371 A EP 98924371A EP 1009674 B1 EP1009674 B1 EP 1009674B1
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EP
European Patent Office
Prior art keywords
insert
cap
coat
metal
metal cap
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.)
Expired - Lifetime
Application number
EP98924371A
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German (de)
French (fr)
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EP1009674A1 (en
Inventor
Jacques Granger
Yves Peyrin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amcor Flexibles Capsules France SAS
Original Assignee
Pechiney Emballage Alimentaire
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Publication date
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Publication of EP1009674A1 publication Critical patent/EP1009674A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • 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
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • B65D41/0492—Threaded or like caps or cap-like covers secured by rotation formed by several elements connected together
    • 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
    • Y10T428/21—Circular sheet or circular blank
    • Y10T428/215—Seal, gasket, or packing
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]

Definitions

  • the invention relates to the field of metal closure caps and more particularly that of caps with threaded plastic insert suitable for screw glassware rings. These capsules are mainly intended for the closure of containers, flasks and bottles containing alcohol and spirits.
  • Closure capsules with plastic insert typically SUPALUXE ® capsules marketed by the applicant, consist of a metal capsule, a plastic insert, and possibly a seal if the insert itself does not provide sealing function.
  • the plastic insert is assembled in the metal capsule by press fitting of the insert into the metal capsule.
  • Figure 2 shows a typical state of the art capsule with a seal reported.
  • the major interest of this type of capsule lies in the fact that the external metal capsule itself does not bear any trace of threading, which contributes to the aesthetic quality of the capsule and packaging, typically a vial or bottle.
  • the threaded plastic insert allows perform a large number of cork-unclogging cycles, therefore of screwing-unscrewing without geometrical modification of the capsule, which is necessary in the case of packaging of spirits and spirits.
  • the closure cap with plastic insert for closure of containers screw, includes a metal capsule consisting of a head and a skirt, an insert plastic material positioned inside said metal capsule and secured to the latter by a fixing means, and is characterized in that said fixing means is consisting of a layer adhering to said metal capsule extending over all or part of the part of said metal capsule facing said insert, in that said layer comprises said plastic in the divided state, and in that it is heat sealed to said insert.
  • said layer extends over the entire part of said metal capsule in look of said insert.
  • Figure 1 shows, in axial half-section, a capsule (1) according to the invention comprising a metal capsule (2) and an insert (4) secured by a layer (3). At a bottom seal (10) is placed at the bottom of the insert (4).
  • the capsule skirt (1) wears a circular weakening line consisting of a succession of bridges (11).
  • Figure 2 is a representation, similar to that of Figure 1, of a capsule (1000) according to the state of the art.
  • Figures 3, 4 and 5a to 5e illustrate the different stages of a method of manufacturing capsules according to the invention.
  • FIG 3 there is shown, in section, the "interior" varnishing of a metal strip (7) in a reel with a varnishing machine comprising a dipping varnishing roller (71) in a tank of liquid varnish (72), so as to form a strip of coated metal (8), the means for drying or cooking the varnish not having been shown.
  • Figure 4 similar to Figure 3, is shown the next step where the identified deposit or "spot-coating" of said adherent layer on the coated metal strip (8).
  • a screen-printing technique for this, with a grid cylindrical (81) with open or closed cells depending on whether the liquid mixture (82) must be deposited or not on the coated metal strip (8) to form after drying or baking a strip (9) coated with said layer (3).
  • Figure 5a shows, in top view and in section, the circular blank (900) cut in the strip (9) obtained in FIG. 4, with a view to its shaping, typically by stamping and drawing.
  • FIG. 5b represents, in axial section, the metal capsule (2) obtained by placing shape of the blank (900).
  • Figure 5d shows schematically, in section, the assembly of the metal capsule of Figure 5b and an insert (4), by heat sealing using a punch assembly (5) and a heating matrix (6) maintained at a temperature T, exerting a pressure P for a time t.
  • Figure 5 shows diagrammatically, in section, the final capsule (1) obtained according to the invention.
  • FIG. 6 diagrammatically shows in section a second modality of the invention in which the band (90), corresponding to band (9) of the previous modality, includes both a layer (3) on one side of the strip and a layer (30) on the other side of the strip.
  • the metal strip (7) is also covered with an outer coating (210), similar to the interior coating (21).
  • Figures 7 and 8 illustrate in section the capsules (100) obtained from the strip (90). These capsules (100) include a plastic cap identical to that contained in said heat-sealed layer (30) thanks to said external layer (30).
  • the Figures 7 and 8 to 8c illustrate some non-limiting forms of these caps (12), with head rounded (figure 12) or planar (figures 8 to 8c), and in this case of circular section (figure 8a), square (figure 8b), hexagonal (figure 8c).
  • said layer (3) joining said insert (4) and said capsule metallic (2) comprises a sufficient quantity of said plastic material in the divided state to thermally seal a high adhesion to respond to problem.
  • said insert is made of polyolefin, preferably PE or in PP
  • said layer comprises at least 3% by weight of said polyolefin.
  • said adherent layer (3) is a thermosetting varnish comprising from 5 to 30% by weight of said polyolefin, so as to adhere simultaneously to said insert (4) and to said metal capsule (2).
  • thermosetting varnish is an epoxy varnish.
  • said metal capsule (2) comprises an inner coating (21) formed a layer of epoxy varnish.
  • said metal capsule (2) is made of aluminum, iron, tin, or multilayer material comprising an inner metallic layer.
  • the closure cap (1) may include a seal reported seal (10), as illustrated in FIG. 1. This seal, known in itself, is held at the bottom of the insert typically by a circular groove.
  • the closure cap (1) can include, instead of a seal (10), a self-sealing insert ensuring by itself the required seal.
  • the capsule (1) according to the invention may include means intended to facilitate the first opening, and preferably at least one weakening line, or more lines of weakness forming a tearable tongue.
  • FIG. 1 represents a capsule with a single weakening line formed by a succession of bridges (11) which are broken during the first opening.
  • Another object of the invention is constituted by the method of manufacturing capsules (1) according to the invention.
  • a strip (90) is prepared, according to FIG. 6, and corresponding to the strip (9) of the preceding modality, which includes both a layer (3) on one side of the strip and a layer (30) on the other side of the strip.
  • the cap (12) and the insert (4) are simultaneously fixed to said capsule. metallic coated with said layers (3) and (30), by induction heating the part of said metal capsule covered with said layers (3) and (30).
  • Capsules (100) are thus obtained, illustrated by way of example in FIGS. 7 and 8 to 8c.
  • Capsules (1) were made according to FIG. 1 of height X equal to 60 mm, the others dimensions (in mm) of the capsule being shown in FIG. 1.
  • the thus coated strip was dried at 180 ° C for 12 min.
  • Threaded PP inserts were supplied, as shown in Figure 5c, and were assembled with metal capsules (2) using a device comprising a punch (5) and a heating matrix (6), as shown in Figure 5d.
  • the temperature T of the matrix (6) was 350 ° C, the pressure P exerted between punch and matrix was 120 daN, and time t was 0.15 s.
  • T, P, t Other conditions of T, P, t are possible, but it is important on the one hand to have a process with high productivity, and on the other hand, to choose a torque T-t such that there is softening of the PP of said layer (3) sufficient for the PP of the layer (3) can adhere to said insert (4), without there being any risk of deterioration of said insert (4), in particular by an excessive supply of calories.
  • a weakening line was further formed by bridges (11) and a seal (10) was inserted.
  • the capsules obtained according to the invention were tested on bottles containing liquors high in sugar. In all cases, the insert (4) remains integral with the capsule metallic (2), contrary to what was observed with the capsules of the state of the technical.
  • the capsules according to the invention do not present any significant additional cost by compared to capsules of the state of the art: the cost of the materials constituting the layer (3) is low given the small thickness of the layer (3) and its limited surface. and the varnishing operation is itself part of the standard manufacturing process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Laminated Bodies (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Wrappers (AREA)

Abstract

Sealing cap for closing screw top receptacles includes a metal cap having inner and outer surfaces, a threaded insert formed of a plastic material disposed within the metal cap and rigidly fixed to the inner surface thereof, and a coating bonded to at least a portion of the inner surface of the metal cap. The coating contains plastic material in a divided state and is heat sealed to the insert.

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

L'invention concerne le domaine des capsules de bouchage métalliques et plus particulièrement celui des capsules de bouchage à insert plastique fileté adapté aux bagues de verrerie à vis. Ces capsules sont destinées principalement au bouchage de récipients, flacons et bouteilles contenant des alcools et spiritueux.The invention relates to the field of metal closure caps and more particularly that of caps with threaded plastic insert suitable for screw glassware rings. These capsules are mainly intended for the closure of containers, flasks and bottles containing alcohol and spirits.

ETAT DE LA TECHNIQUESTATE OF THE ART

Les capsules de bouchage à insert plastique, typiquement les capsules SUPALUXE ® commercialisées par la demanderesse, sont constituées d'une capsule métallique, d'un insert plastique, et éventuellement d'un joint si l'insert lui-même n'assure pas la fonction d'étanchéité.Closure capsules with plastic insert, typically SUPALUXE ® capsules marketed by the applicant, consist of a metal capsule, a plastic insert, and possibly a seal if the insert itself does not provide sealing function.

L'assemblage de l'insert plastique dans la capsule métallique est réalisé par emmanchement à force de l'insert dans la capsule métallique.The plastic insert is assembled in the metal capsule by press fitting of the insert into the metal capsule.

La figure 2 représente une capsule typique de l'état de la technique avec un joint rapporté. Comme on peut le voir sur cette figure, l'intérêt majeur de ce type de capsule réside dans le fait que la capsule métallique externe ne porte elle-même aucune trace de filetage, ce qui contribue à la qualité esthétique de la capsule et du conditionnement, typiquement un flacon ou une bouteille. Par ailleurs, l'insert plastique fileté permet de réaliser un grand nombre de cycles de bouchage-débouchage, donc de vissage-dévissage sans modification géométrique de la capsule, ce qui est nécessaire dans le cas de conditionnement d'alcools et spiritueux.Figure 2 shows a typical state of the art capsule with a seal reported. As can be seen in this figure, the major interest of this type of capsule lies in the fact that the external metal capsule itself does not bear any trace of threading, which contributes to the aesthetic quality of the capsule and packaging, typically a vial or bottle. In addition, the threaded plastic insert allows perform a large number of cork-unclogging cycles, therefore of screwing-unscrewing without geometrical modification of the capsule, which is necessary in the case of packaging of spirits and spirits.

Par ailleurs, on connaít par le brevet US 3,587,898 un dispositif de fermeture d'un récipient doté d'un goulot fileté, le dispositif étant formé de la manière suivante :

  • on approvisionne des manchons rétractables et on les thermorétracte, par chauffage, sur le goulot du récipient,
  • puis, après avoir rempli le récipient, on fixe au-dessus du manchon, par activation à la chaleur, une capsule métallique contenant intérieurement un adhésif activable à la chaleur.
Furthermore, there is known from US Pat. No. 3,587,898 a device for closing a container provided with a threaded neck, the device being formed in the following manner:
  • we supply shrink sleeves and heat shrink them, by heating, on the neck of the container,
  • then, after filling the container, a metal capsule containing an activatable heat adhesive is fixed above the sleeve, by heat activation.

PROBLEME POSEPROBLEM

Le problème posé par ces capsules est essentiellement lié au dévissage de la capsule, en particulier lorsque le contenu du récipient comprend du sucre ou tout autre produit susceptible de cristalliser. En effet, la cristallisation du sucre contenu dans le liquide embouteillé peut bloquer l'insert plastique sur la bague de verrerie, de sorte que, lors du dévissage de la capsule, la capsule métallique glisse sur l'insert, la cohésion entre la bague de verrerie et l'insert étant supérieure à celle entre la capsule métallique et l'insert, ce qui ne permet pas l'ouverture de la bouteille.The problem posed by these capsules is essentially linked to the unscrewing of the capsule, in especially when the contents of the container include sugar or any other product likely to crystallize. Indeed, the crystallization sugar in the liquid bottled can block the plastic insert on the glass ring, so when unscrewing the capsule, the metal capsule slides on the insert, the cohesion between the glass ring and the insert being greater than that between the metal capsule and the insert, which does not allow the opening of the bottle.

Pour résoudre ce problème, il a été tenté d'augmenter le couple limite à partir duquel il y a désolidarisation en rotation de la capsule métallique et de l'insert. Pour cela, la demanderesse a tenté de réduire le jeu de serrage entre l'insert et la capsule métallique, d'augmenter la rugosité des surfaces en contact, de modifier la nature de l'insert, d'introduire une couche d'adhésif ou de hot-melt entre la capsule métallique et l'insert. Ces mesures n'ont pas permis de résoudre le problème posé.To resolve this problem, an attempt has been made to increase the limit torque from which there has disconnection in rotation of the metal capsule and the insert. For this, the Applicant has attempted to reduce the tightening play between the insert and the metal capsule, to increase the roughness of the surfaces in contact, to modify the nature of the insert, introduce a layer of adhesive or hot-melt between the metal capsule and the insert. These measures did not resolve the problem posed.

DESCRIPTION DE L'INVENTIONDESCRIPTION OF THE INVENTION

Selon l'invention, la capsule de bouchage à insert plastique, pour bouchage de récipients à vis, comprend une capsule métallique constituée d'une tête et d'une jupe, un insert en matière plastique positionné à l'intérieur de ladite capsule métallique et solidarisé avec celle-ci par un moyen de fixation, et est caractérisée en ce que ledit moyen de fixation est constitué par une couche adhérant à ladite capsule métallique s'étendant sur tout ou partie de la partie de ladite capsule métallique en regard dudit insert, en ce que ladite couche comprend de ladite matière plastique à l'état divisé, et en ce qu'elle est thermoscellée audit insert.According to the invention, the closure cap with plastic insert, for closure of containers screw, includes a metal capsule consisting of a head and a skirt, an insert plastic material positioned inside said metal capsule and secured to the latter by a fixing means, and is characterized in that said fixing means is consisting of a layer adhering to said metal capsule extending over all or part of the part of said metal capsule facing said insert, in that said layer comprises said plastic in the divided state, and in that it is heat sealed to said insert.

De préférence, ladite couche s'étend sur toute la partie de ladite capsule métallique en regard dudit insert.Preferably, said layer extends over the entire part of said metal capsule in look of said insert.

En effet, si ladite couche recouvre toute la surface intérieure de ladite capsule métallique, il peut apparaítre des problèmes au capsulage liés au manque de glissement de la capsule finale.In fact, if said layer covers the entire interior surface of said metal capsule, there may appear capping problems related to the lack of sliding of the capsule final.

La solution trouvée par la demanderesse permet d'augmenter considérablement le couple de glissement de l'insert dans la capsule métallique, typiquement de le multiplier par 6. Ce couple, mesuré selon la nonne NF H 35103, passe de moins de 17 lbs.inch (soit 1,9 N.m) à plus de 100 lbs.inch (soit 11.3 N.m).The solution found by the plaintiff considerably increases the torque sliding the insert into the metal capsule, typically multiplying it by 6. This torque, measured according to standard NF H 35103, goes from less than 17 lbs.inch (i.e. 1.9 N.m) to more than 100 lbs.inch (i.e. 11.3 N.m).

Avec les moyens de l'invention, le problème posé est totalement résolu. En effet, avec toutes les capsules obtenues selon l'invention, il n'a jamais été observé de désolidarisation entre l'insert et la capsule métallique, même avec des dépôts de sucre très cristallisés.With the means of the invention, the problem posed is completely resolved. Indeed, with all the capsules obtained according to the invention, it has never been observed to separation between the insert and the metal capsule, even with sugar deposits very crystallized.

DESCRIPTION DES FIGURESDESCRIPTION OF THE FIGURES

La figure 1 représente, en demi-coupe axiale, une capsule (1) selon l'invention comprenant une capsule métallique (2) et un insert (4) solidarisés par une couche (3). Au fond de l'insert (4) est placé un joint d'étanchéité (10). La jupe de la capsule (1) porte une ligne circulaire d'affaiblissement constituée d'une succession de ponts (11).Figure 1 shows, in axial half-section, a capsule (1) according to the invention comprising a metal capsule (2) and an insert (4) secured by a layer (3). At a bottom seal (10) is placed at the bottom of the insert (4). The capsule skirt (1) wears a circular weakening line consisting of a succession of bridges (11).

La figure 2 est une représentation, analogue à celle de la figure 1, d'une capsule (1000) selon l'état de la technique.Figure 2 is a representation, similar to that of Figure 1, of a capsule (1000) according to the state of the art.

Les figures 3, 4 et 5a à 5e illustrent les différentes étapes d'un mode de fabrication de capsules selon l'invention.Figures 3, 4 and 5a to 5e illustrate the different stages of a method of manufacturing capsules according to the invention.

A la figure 3, est représenté, en coupe, le vernissage « intérieur » d'une bande de métal (7) en bobine avec une vernisseuse comprenant un rouleau de vernissage (71) trempant dans un bac de vernis liquide (72), de manière à former une bande de métal revêtu (8), les moyens de séchage ou de cuisson du vernis n'ayant pas été représentés.In Figure 3, there is shown, in section, the "interior" varnishing of a metal strip (7) in a reel with a varnishing machine comprising a dipping varnishing roller (71) in a tank of liquid varnish (72), so as to form a strip of coated metal (8), the means for drying or cooking the varnish not having been shown.

A la figure 4, analogue à la figure 3, est représentée l'étape suivante où est effectué le dépôt repéré ou « spot-coating » de ladite couche adhérente sur la bande de métal revêtu (8). On peut utiliser pour cela une technique de type sérigraphie, avec une grille cylindrique (81) à alvéoles ouvertes ou fermées selon que le mélange liquide (82) doit être déposé ou non sur la bande de métal revêtu (8) pour former après séchage ou cuisson une bande (9) revêtue de ladite couche (3). On peut aussi utiliser le procédé offset pour déposer une couche de vernis sur des parties prédéterminées de la bande (8). In Figure 4, similar to Figure 3, is shown the next step where the identified deposit or "spot-coating" of said adherent layer on the coated metal strip (8). We can use a screen-printing technique for this, with a grid cylindrical (81) with open or closed cells depending on whether the liquid mixture (82) must be deposited or not on the coated metal strip (8) to form after drying or baking a strip (9) coated with said layer (3). We can also use the process offset to deposit a layer of varnish on predetermined parts of the strip (8).

Comme à la figure 3, les moyens de séchage ou de cuisson du mélange liquide (82) n'ont pas été représentés.As in Figure 3, the means for drying or cooking the liquid mixture (82) have not been represented.

La figure 5a représente, en vue de dessus et en coupe, le flan circulaire (900) découpé dans la bande (9) obtenue à la figure 4, en vue de sa mise en forme, typiquement par emboutissage et étirage.Figure 5a shows, in top view and in section, the circular blank (900) cut in the strip (9) obtained in FIG. 4, with a view to its shaping, typically by stamping and drawing.

La figure 5b représente, en coupe axiale, la capsule métallique (2) obtenue par mise en forme du flan (900).FIG. 5b represents, in axial section, the metal capsule (2) obtained by placing shape of the blank (900).

La figure 5d schématise, eu coupe, l'assemblage de la capsule métallique de la figure 5b et d'un insert (4), par thermoscellage à l'aide d'un ensemble de poinçon (5) et d'une matrice chauffante (6) maintenue à une température T, exerçant une pression P pendant un temps t.Figure 5d shows schematically, in section, the assembly of the metal capsule of Figure 5b and an insert (4), by heat sealing using a punch assembly (5) and a heating matrix (6) maintained at a temperature T, exerting a pressure P for a time t.

La figure 5e schématise, en coupe, la capsule finale (1) obtenue selon l'invention.Figure 5 shows diagrammatically, in section, the final capsule (1) obtained according to the invention.

La figure 6 schématise en coupe une seconde modalité de l'invention dans laquelle la bande (90), correspondant à la bande (9) de la modalité précédente, comprend à la fois une couche (3) sur une face de la bande et une couche (30) sur l'autre face de la bande.FIG. 6 diagrammatically shows in section a second modality of the invention in which the band (90), corresponding to band (9) of the previous modality, includes both a layer (3) on one side of the strip and a layer (30) on the other side of the strip.

Dans ce cas, la bande de métal (7) est également recouverte d'un revêtement extérieur (210), analogue au revêtement intérieur (21).In this case, the metal strip (7) is also covered with an outer coating (210), similar to the interior coating (21).

Les figures 7 et 8 illustrent en coupe les capsules (100) obtenues à partir de la bande (90). Ces capsules (100) comprennent un capuchon en matière plastique identique à celle contenue dans ladite couche (30) thermoscellé grâce à ladite couche (30) externe. Les figures 7 et 8 à 8c illustrent quelques formes non limitatives de ces capuchons (12), à tête arrondie (figure 12) ou plane (figures 8 à 8c), et dans ce cas de section circulaire (figure 8a), carrée (figure 8b), hexagonale (figure 8c).Figures 7 and 8 illustrate in section the capsules (100) obtained from the strip (90). These capsules (100) include a plastic cap identical to that contained in said heat-sealed layer (30) thanks to said external layer (30). The Figures 7 and 8 to 8c illustrate some non-limiting forms of these caps (12), with head rounded (figure 12) or planar (figures 8 to 8c), and in this case of circular section (figure 8a), square (figure 8b), hexagonal (figure 8c).

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

Selon l'invention, ladite couche (3) solidarisant ledit insert (4) et ladite capsule métallique (2) comprend une quantité suffisante de ladite matière plastique à l'état divisé pour assurer par thermoscelllage une adhérence élevée permettant de répondre au problème posé. Ainsi, dans le cas où ledit insert est en polyoléfine, de préférence en PE ou en PP, ladite couche comprend au moins 3 % en poids de ladite polyoléfine. According to the invention, said layer (3) joining said insert (4) and said capsule metallic (2) comprises a sufficient quantity of said plastic material in the divided state to thermally seal a high adhesion to respond to problem. Thus, in the case where said insert is made of polyolefin, preferably PE or in PP, said layer comprises at least 3% by weight of said polyolefin.

Typiquement, ladite couche adhérente (3) est un vernis thermodurcissable comprenant de 5 à 30% en poids de ladite polyoléfine, de manière à adhérer simultanément audit insert (4) et à ladite capsule métallique (2).Typically, said adherent layer (3) is a thermosetting varnish comprising from 5 to 30% by weight of said polyolefin, so as to adhere simultaneously to said insert (4) and to said metal capsule (2).

De préférence, ledit vernis thermodurcissable est un vernis époxy.Preferably, said thermosetting varnish is an epoxy varnish.

Dans ce cas, ladite capsule métallique (2) comprend un revêtement intérieur (21) formé d'une couche de vernis époxy.In this case, said metal capsule (2) comprises an inner coating (21) formed a layer of epoxy varnish.

Selon l'invention, ladite capsule métallique (2) est en aluminium, en fer, en étain, ou matériau multicouches comprenant une couche intérieure métallique.According to the invention, said metal capsule (2) is made of aluminum, iron, tin, or multilayer material comprising an inner metallic layer.

Selon une modalité de l'invention, la capsule de bouchage (1) peut comprendre un joint d'étanchéité rapporté (10), comme illustré sur la figure 1. Ce joint, connu en lui-même, est maintenu au fond de l'insert typiquement par une gorge circulaire.According to one embodiment of the invention, the closure cap (1) may include a seal reported seal (10), as illustrated in FIG. 1. This seal, known in itself, is held at the bottom of the insert typically by a circular groove.

Selon une autre modalité non représenté sur les figures, la capsule de bouchage (1) peut comprendre, au lieu d'un joint (10), un insert auto-jointant assurant par lui-même l'étanchéité requise.According to another method not shown in the figures, the closure cap (1) can include, instead of a seal (10), a self-sealing insert ensuring by itself the required seal.

En outre, la capsule (1) selon l'invention peut comprendre des moyens destinés à faciliter la première ouverture, et de préférence au moins une ligne d'affaiblissement, ou plusieurs lignes d'affaiblissement formant une languette déchirable.In addition, the capsule (1) according to the invention may include means intended to facilitate the first opening, and preferably at least one weakening line, or more lines of weakness forming a tearable tongue.

La figure 1 représente une capsule avec une seule ligne d'affaiblissement formée par une succession de ponts (11) qui sont rompus lors de la première ouverture.FIG. 1 represents a capsule with a single weakening line formed by a succession of bridges (11) which are broken during the first opening.

Un autre objet de l'invention est constitué par le procédé de fabrication de capsules (1) selon l'invention.Another object of the invention is constituted by the method of manufacturing capsules (1) according to the invention.

Dans ce procédé :

  • a) on approvisionne de la bande ou feuille métallique (7) destinée à former de façon connue en elle-même ladite capsule métallique,
  • b) de préférence, on forme sur la totalité de la face « intérieure » de ladite bande ou feuille, de manière connue en elle-même, une couche de vernis (21), destinée à permettre la mise en forme de ladite bande ou feuille métallique notamment par emboutissage et étirage,
  • c) on forme ensuite, par dépôt repéré ou « spot-coating », ladite couche adhérente (3) sur la partie de ladite face « intérieure » destinée à se trouver, en regard de tout ou partie dudit insert,
  • d) on met en forme la feuille ou bande (9) obtenue en c) de manière à obtenir, de manière connue en elle-même, ladite capsule métallique (2) revêtue intérieurement et localement de ladite couche adhérente (3),
  • e) on approvisionne ledit insert (4) et on assemble, par thermoformage, ledit insert (4) et ladite capsule métallique (2) obtenue en d), de manière à rendre ladite couche (3) adhérante audit insert (4).
  • Ce procédé est schématisé aux figures 3 à 5e.
    • In this process:
  • a) supplying the metal strip or sheet (7) intended to form in a known manner itself said metal capsule,
  • b) preferably, a layer of varnish (21) is formed over the entire “inside” face of said strip or sheet, intended to allow said strip or sheet to be shaped metallic in particular by stamping and drawing,
  • c) said adherent layer (3) is then formed, by identified deposition or “spot-coating”, on the part of said “internal” face intended to be located, facing all or part of said insert,
  • d) the sheet or strip (9) obtained in c) is shaped so as to obtain, in a manner known per se, said metallic capsule (2) coated internally and locally with said adherent layer (3),
  • e) supplying said insert (4) and assembling, by thermoforming, said insert (4) and said metal capsule (2) obtained in d), so as to make said layer (3) adherent to said insert (4).
  • This process is shown schematically in Figures 3 to 5e.

    • Selon une autre modalité de l'invention représentée aux figures 6, 7 et 8 à 8c, on peut aussi former sur l'extérieur de ladite capsule métallique une couche (30) semblable à ladite couche (3). Pour cela, on prépare une bande (90), selon la figure 6, et correspondant à la bande (9) de la modalité précédente, qui comprend à la fois une couche (3) sur une face de la bande et une couche (30) sur l'autre face de la bande.According to another embodiment of the invention shown in FIGS. 6, 7 and 8 to 8c, it is possible to also forming on the outside of said metallic capsule a layer (30) similar to said layer (3). For this, a strip (90) is prepared, according to FIG. 6, and corresponding to the strip (9) of the preceding modality, which includes both a layer (3) on one side of the strip and a layer (30) on the other side of the strip.

    De préférence, on fixe simultanément le capuchon (12) et l'insert (4) à ladite capsule métallique revêtue desdites couches (3) et (30), en chauffant par induction la partie de ladite capsule métallique recouverte desdites couches (3) et (30).Preferably, the cap (12) and the insert (4) are simultaneously fixed to said capsule. metallic coated with said layers (3) and (30), by induction heating the part of said metal capsule covered with said layers (3) and (30).

    On obtient ainsi des capsules (100), illustrées à titre d'exemple par les figures 7 et 8 à 8c.Capsules (100) are thus obtained, illustrated by way of example in FIGS. 7 and 8 to 8c.

    EXEMPLE DE REALISATIONEXAMPLE OF IMPLEMENTATION

    On a fabriqué des capsules (1) selon la figure 1 de hauteur X égale à 60 mm, les autres dimensions (en mm) de la capsule étant portées sur la figure 1.Capsules (1) were made according to FIG. 1 of height X equal to 60 mm, the others dimensions (in mm) of the capsule being shown in FIG. 1.

    Pour cela, on a utilisé une bande d'aluminium en alliage de la série 3000 (désignation selon l'Aluminum Association) de 210 µm d'épaisseur, dont les deux faces ont été vernies avec un vernis époxy déposé à 2,5 g/m2.For this, we used a strip of aluminum alloy of the 3000 series (designation according to the Aluminum Association) 210 µm thick, both sides of which were varnished with an epoxy varnish deposited at 2.5 g / m 2 .

    Sur la bande d'aluminium vernie (8) ainsi obtenue, on a déposé par « spot-coating », comme illustré à la figure 4, un vernis liquide (82) destiné à former ladite couche (3) adhérant à la capsule métallique (2), de manière à former une bande (9) revêtue localement et à des endroits prédéterminés d'une couche (3) à 8 g/m2 en matière sèche.On the varnished aluminum strip (8) thus obtained, there was deposited by "spot-coating", as illustrated in FIG. 4, a liquid varnish (82) intended to form said layer (3) adhering to the metal capsule ( 2), so as to form a strip (9) coated locally and at predetermined locations with a layer (3) at 8 g / m 2 in dry matter.

    Ce vernis avait la composition suivante :

    • 87 parties de vernis époxy du commerce à 31 % d'extrait sec,
    • 13 parties de dispersion de PP du commerce (MORPRIME ®) à 15% d'extrait sec, soit une couche (3) contenant environ 6.7 % en poids de PP, aux adjuvants de stabilisation près (% pondéral en matière sèche).
    This varnish had the following composition:
    • 87 parts of commercial epoxy varnish with 31% dry extract,
    • 13 parts of dispersion of commercial PP (MORPRIME ®) at 15% dry extract, that is to say a layer (3) containing about 6.7% by weight of PP, apart from stabilization adjuvants (% by weight in dry matter).

    La bande ainsi revètue a été séché à 180°C pendant 12 min.The thus coated strip was dried at 180 ° C for 12 min.

    La bande ainsi obtenue a alimenté un dispositif classique de mise eu forme par emboutissage et étirage, ledit dispositif comprenant la découpe de flans (90) alimentant l'outil d'emboutissage et d'étirage. On a ainsi obtenu des capsules métalliques (2) partiellement revêtues intérieurement de ladite couche (3), comme représenté à la figure 5b.The strip thus obtained fed a conventional shaping device by stamping and drawing, said device comprising cutting blanks (90) supplying the stamping and drawing tool. We thus obtained metallic capsules (2) partially coated internally with said layer (3), as shown in the figure 5b.

    On a approvisionné des inserts filetés en PP, comme représentés à la figure 5c et on les a assemblés aux capsules métalliques (2) à l'aide d'un dispositif comprenant un poinçon (5) et une matrice chauffante (6), comme représenté à la figure 5d.Threaded PP inserts were supplied, as shown in Figure 5c, and were assembled with metal capsules (2) using a device comprising a punch (5) and a heating matrix (6), as shown in Figure 5d.

    La température T de la matrice (6) était de 350°C, la pression P exercée entre poinçon et matrice était de 120 daN, et le temps t était de 0,15 s.The temperature T of the matrix (6) was 350 ° C, the pressure P exerted between punch and matrix was 120 daN, and time t was 0.15 s.

    D'autres conditions de T,P,t sont possibles, mais il importe d'une part d'avoir un procédé à productivité élevée, et d'autre part, de choisir un couple T-t tel qu'il y ait ramollissement du PP de ladite couche (3) suffisant pour que le PP de la couche (3) puisse adhérer audit insert (4), sans toutefois qu'il y ait risque de détérioration dudit insert (4), notamment par un apport excessif de calories.Other conditions of T, P, t are possible, but it is important on the one hand to have a process with high productivity, and on the other hand, to choose a torque T-t such that there is softening of the PP of said layer (3) sufficient for the PP of the layer (3) can adhere to said insert (4), without there being any risk of deterioration of said insert (4), in particular by an excessive supply of calories.

    On a en outre formé une ligne d'affaiblissement par des ponts ( 11) et inséré un joint (10).A weakening line was further formed by bridges (11) and a seal (10) was inserted.

    Les capsules obtenues selon l'invention ont été testées sur des bouteilles contenant des liqueurs riches en sucre. Dans tous les cas, l'insert (4) est resté solidaire de la capsule métallique (2), contrairement à ce qui était observé avec les capsules de l'état de la technique. The capsules obtained according to the invention were tested on bottles containing liquors high in sugar. In all cases, the insert (4) remains integral with the capsule metallic (2), contrary to what was observed with the capsules of the state of the technical.

    D'autres essais ont été effectués dans lesquels la couche (3) n'était formée qu'en regard d'une partie seulement de l'insert : en regard de la tête de l'insert, en regard de la jupe de l'insert.Other tests were carried out in which the layer (3) was only formed opposite of only part of the insert: opposite the head of the insert, opposite the skirt of the insert.

    Les essais de décohésion mécanique ont montré que. comme cela était prévisible, le couple limite entraínant la décohésion entre insert (4) et capsule (2) varie selon l'étendue et la position de la couche (3) en regard de l'insert (4) : dans l'ordre, le couple diminue avec une couche (3) soit en regard de la totalité de l'insert, soit en regard de la jupe (43) de l'insert, soit en regard de la tête (42) de l'insert.Mechanical decohesion tests have shown that. as was to be expected, the limit torque causing the decohesion between insert (4) and capsule (2) varies depending on the extent and the position of the layer (3) opposite the insert (4): in order, the torque decreases with a layer (3) either facing the entire insert, or facing the skirt (43) of the insert, either facing the head (42) of the insert.

    Selon la nature des liqueurs conditionnées, il est possible de choisir et de limiter l'étendue de la couche (3) à ce qui est nécessaire pour résoudre le problème posé.Depending on the nature of the liqueurs packaged, it is possible to choose and limit the extent of the layer (3) to what is necessary to solve the problem posed.

    Par ailleurs, les capsules selon l'invention ne présentent pas de surcoùt significatif par rapport aux capsules de l'état de la technique : le coût des matières constituant la couche (3) est faible compte tenu de la faible épaisseur de la couche (3) et de sa surface limitée. et l'opération de vernissage s'insère elle-même dans le processus standard de fabrication.Furthermore, the capsules according to the invention do not present any significant additional cost by compared to capsules of the state of the art: the cost of the materials constituting the layer (3) is low given the small thickness of the layer (3) and its limited surface. and the varnishing operation is itself part of the standard manufacturing process.

    Claims (12)

    1. Sealing cap (1, 100) with a plastic insert for closing screw top receptacles comprising a metal cap (2) composed of a head and a skirt, a threaded plastic insert (4) placed inside the said metal cap and rigidly fixed to it by an attachment means, characterized in that the said attachment means consist of a coat (3) bonded to the said metal cap (2) extending over all or part of the said metal cap facing the said insert, in that the said coat (3) comprises the said plastic material in the divided state, and that it is heat sealed to the said insert (4).
    2. Cap according to claim 1, in which the said coat (3) extends over the entire surface of the said metal cap (2) facing the said insert (4).
    3. Cap according to either of claims 1 and 2, in which the said insert (4) is made of polyolefine, preferably PE or PP, and in which the said coat comprises at least 3% by weight of the said polyolefine.
    4. Cap according to claim 3, in which the said coat (3) is a thermosetting varnish comprising 5 to 30% by weight of the said polyolefine.
    5. Cap according to claim 4 in which the said varnish is an epoxy varnish.
    6. Cap according to claim 5, in which the said metal cap (2) comprises an inner coating (21) formed of a coat of epoxy varnish.
    7. Cap according to any one of claims 1 to 6, in which the said metal cap (2) is made of aluminum, iron or tin, or a multi-coat material comprising a metal inner coat.
    8. Cap according to claim 7, including an add-on seal (10).
    9. Cap according to claim 7 in which the said insert (4) comprises a self-sealing system.
    10. Cap according to any one of claims 1 to 9, comprising means of facilitating the first opening and preferably at least one line of weakness.
    11. Cap according to any one of claims 1 to 10, comprising an outer cap (12) fixed to the said metal (2) cap by means of an external coat (30) similar to the said coat (3).
    12. Process for manufacturing sealing caps (1, 100) with a plastic insert for closing screw top receptacles comprising a metal cap (2) composed of a head and a skirt, a threaded plastic insert (4) placed inside the said metal cap and rigidly fixed to it by an attachment means, said attachment means consisting of a coat (3) bonded to the said metal cap (2) extending over all or part of the said metal cap facing the said insert, said coat (3) comprising the said plastic material in the divided state, and that it is heat sealed to the said insert (4), process in which:
      a) the metal strip or sheet (7) from which the said metal cap will be formed in a manner known in itself, is supplied,
      b) preferably, a coat of varnish (21) is formed on the entire "inner" surface of the said strip or sheet, designed to facilitate shaping of the said metal strip or sheet, particularly by stamping and drawing,
      c) the said bonding coat (3) is then formed on the said "inner" face which will eventually face all or some of the said insert (4), by spot coating,
      d) the sheet or strip (9) obtained in c) is then shaped in order to obtain the said metal cap (2) coated locally on the inside by the said bonding coat (3), in a manner known in itself,
      e) in the next step, the said insert (4) and the said metal cap (2) obtained in d) are assembled by thermoforming, in order to make the said coat (3) bond to the said insert (4).
    EP98924371A 1997-05-12 1998-05-04 Sealing metal cap with plastic insert Expired - Lifetime EP1009674B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    FR9706009A FR2763046B1 (en) 1997-05-12 1997-05-12 METAL CAPSULE WITH PLASTIC INSERT
    FR9706009 1997-05-12
    PCT/FR1998/000893 WO1998051581A1 (en) 1997-05-12 1998-05-04 Sealing metal cap with plastic insert

    Publications (2)

    Publication Number Publication Date
    EP1009674A1 EP1009674A1 (en) 2000-06-21
    EP1009674B1 true EP1009674B1 (en) 2003-02-19

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    US (1) US6403173B1 (en)
    EP (1) EP1009674B1 (en)
    CN (1) CN1260758A (en)
    AT (1) ATE232817T1 (en)
    AU (1) AU7659198A (en)
    CA (1) CA2289589A1 (en)
    DE (1) DE69811515T2 (en)
    DK (1) DK1009674T3 (en)
    FR (1) FR2763046B1 (en)
    WO (1) WO1998051581A1 (en)

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    Also Published As

    Publication number Publication date
    DE69811515T2 (en) 2004-03-18
    WO1998051581A1 (en) 1998-11-19
    FR2763046B1 (en) 1999-06-04
    EP1009674A1 (en) 2000-06-21
    CA2289589A1 (en) 1998-11-19
    US6403173B1 (en) 2002-06-11
    DE69811515D1 (en) 2003-03-27
    AU7659198A (en) 1998-12-08
    ATE232817T1 (en) 2003-03-15
    DK1009674T3 (en) 2003-06-16
    FR2763046A1 (en) 1998-11-13
    CN1260758A (en) 2000-07-19

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