EP1009674A1 - Sealing metal cap with plastic insert - Google Patents

Sealing metal cap with plastic insert

Info

Publication number
EP1009674A1
EP1009674A1 EP98924371A EP98924371A EP1009674A1 EP 1009674 A1 EP1009674 A1 EP 1009674A1 EP 98924371 A EP98924371 A EP 98924371A EP 98924371 A EP98924371 A EP 98924371A EP 1009674 A1 EP1009674 A1 EP 1009674A1
Authority
EP
European Patent Office
Prior art keywords
insert
capsule
layer
metal
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.)
Granted
Application number
EP98924371A
Other languages
German (de)
French (fr)
Other versions
EP1009674B1 (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
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 EP1009674A1 publication Critical patent/EP1009674A1/en
Application granted granted Critical
Publication of EP1009674B1 publication Critical patent/EP1009674B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65D41/02—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 closure caps with threaded plastic insert suitable for screw glass rings. These capsules are mainly intended for the closure of containers, flasks and bottles containing alcohols and spirits.
  • the closure caps with plastic insert typically the SUPALUXE® capsules sold by the applicant, consist of a metal capsule, a plastic insert, and possibly a seal if the insert itself does not ensure the sealing function.
  • FIG. 2 represents a typical capsule of the state of the art with an attached gasket.
  • the major advantage 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 of the packaging. , typically a vial or bottle.
  • the threaded plastic insert makes it possible to carry out a large number of stop-unclog cycles, therefore of screwing-unscrewing without geometric modification of the capsule, which is necessary in the case of packaging of alcohols and spirits.
  • the problem posed by these capsules is essentially due to the unscrewing of the capsule, in particular when the content of the container comprises sugar or any other product capable of crystallizing. Indeed, the crystallization of the sugar contained in the liquid bottled can block the plastic insert on the glass ring, so that, 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 insert, which does not allow the opening of the bottle. To solve this problem, an attempt has been made to increase the limit torque from which there is a rotational separation of the metal capsule and the insert.
  • 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, to introduce a layer of adhesive or hot-melt between the metal capsule and the insert.
  • the closure cap with plastic insert for sealing screw containers, comprises a metal capsule consisting of a head and a skirt, a plastic insert positioned inside said metal capsule and secured to the latter by a fixing means, and is characterized in that said fixing means consists 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 material 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 opposite 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 the bottom of the insert (4) is placed a seal (10). The skirt of the capsule (1) carries a circular line of weakness made up of a succession of bridges (11).
  • Figure 2 is a representation, similar to that of Figure 1, of a capsule (1000) according to the prior 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) on a coil with a varnishing machine comprising a varnishing roller (71) soaking in a tank of liquid varnish (72), so as to form a coated metal strip (8), the means for drying or curing the varnish not having been shown.
  • Figure 4 similar to Figure 3, is shown the next step where is carried out the deposition or "spot-coating" of said adherent layer on the coated metal strip (8).
  • a screen-printing technique can be used for this, with a cylindrical grid (81) with open or closed cells depending on whether the liquid mixture (82) is to be deposited or not on the coated metal strip (8) to form after drying or baking a strip (9) coated with said layer (3).
  • the means for drying or cooking the liquid mixture (82) have not been shown.
  • FIG. 5a represents, in top view and in section, the circular blank (900) cut from 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 shaping 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.
  • Figure 6 shows schematically in section a second modahté of the invention in which the strip (90), corresponding to the strip (9) of the previous modahté, comprises 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
  • 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 layer (30) heat sealed by said outer layer (30). Figures 7 and 8 to 8c illustrate some non-limiting forms of these caps (12), with rounded head (Figure 12) or flat ( Figures 8 to 8c), and in this case of circular section ( Figure
  • said layer (3) joining said insert (4) and said metal capsule (2) comprises a sufficient quantity of said plastic material in the divided state to ensure by high heat sealing a adhesion making it possible to respond to the problem posed.
  • said insert is made of polyolefin, preferably of PE or PP
  • said layer comprises at least 3% by weight of said polyolefin.
  • said adherent layer (3) is a hard 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 interior coating (21) formed of a layer of epoxy varnish.
  • said metallic capsule (2) is made of aluminum, iron, tin, or multilayer material comprising an inner metallic layer.
  • the closure cap (1) can comprise an attached 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 comprise, in the place of a seal (10), a self-sealing insert ensuring by itself the required seal.
  • the capsule (1) according to the invention may comprise means intended to facilitate the first opening, and preferably at least one hgne of weakening, or several lines of weakening forming a tear-off tab.
  • FIG. 1 represents a capsule with a single weakening shape 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 modahté, which comprises both a layer (3) on one face 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 metal capsule 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 other dimensions (in mm) of the capsule being shown in FIG. 1.
  • the strip thus obtained fed a conventional shaping device by stamping and stretching, said device comprising cutting blanks (90) feeding the stamping and stretching tool.
  • metal capsules (2) partially coated internally with said layer (3) as shown in FIG. 5b.
  • Threaded inserts made of PP were supplied, as shown in FIG. 5c, and they were assembled to the 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
  • the 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 couple Tt such that there is softening of the PP of said layer (3) sufficient for the PP of the layer (3) to 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 formed by bridges (11) and a seal (10) was inserted.
  • the capsules obtained according to the invention were tested on bottles containing liquors rich in sugar. In all cases, the insert (4) remained integral with the metal capsule (2), contrary to what was observed with the capsules of the prior art. Other tests have been carried out in which the layer (3) was formed only opposite a part only of the insert: opposite the head of the insert, opposite the skirt of the insert.
  • the capsules according to the invention do not present any significant additional cost compared to the capsules of the prior art: the cost of the materials constituting the layer (3) is low taking into account the small thickness of the layer (3 ) and its limited surface area, and the varnishing operation is itself part of the standard manufacturing process.

Landscapes

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

CAPSULE METALLIQUE DE BOUCHAGE A INSERT PLASTIQUEMETAL CAPSULE WITH PLASTIC INSERT
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 closure caps with threaded plastic insert suitable for screw glass rings. These capsules are mainly intended for the closure of containers, flasks and bottles containing alcohols and spirits.
ETAT DE LA TECHNIQUESTATE OF THE ART
Les capsules de bouchage à insert plastique, typiquement les capsules SUPALUXE ® commerciahsées 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.The closure caps with plastic insert, typically the SUPALUXE® capsules sold by the applicant, consist of a metal capsule, a plastic insert, and possibly a seal if the insert itself does not ensure the 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. 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.The plastic insert in the metal capsule is assembled by force fitting the insert into the metal capsule. FIG. 2 represents a typical capsule of the state of the art with an attached gasket. As can be seen in this figure, the major advantage 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 of the packaging. , typically a vial or bottle. Furthermore, the threaded plastic insert makes it possible to carry out a large number of stop-unclog cycles, therefore of screwing-unscrewing without geometric modification of the capsule, which is necessary in the case of packaging of alcohols and spirits.
PROBLEME POSEPROBLEM
Le problème posé par ces capsules est essentiellement hé 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. 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.The problem posed by these capsules is essentially due to the unscrewing of the capsule, in particular when the content of the container comprises sugar or any other product capable of crystallizing. Indeed, the crystallization of the sugar contained in the liquid bottled can block the plastic insert on the glass ring, so that, 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 insert, which does not allow the opening of the bottle. To solve this problem, an attempt has been made to increase the limit torque from which there is a rotational separation 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, to 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 thermo scellée audit insert.According to the invention, the closure cap with plastic insert, for sealing screw containers, comprises a metal capsule consisting of a head and a skirt, a plastic insert positioned inside said metal capsule and secured to the latter by a fixing means, and is characterized in that said fixing means consists 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 material 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 opposite said insert.
En effet, si ladite couche recouvre toute la surface intérieure de ladite capsule métallique, il peut apparaître 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, capping problems may appear due to the lack of sliding of the final capsule.
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 norme NF H 35103, passe de moins de 17 lbs.inch (soit 1,9 N. ) à plus de 100 lbs.inch (soit 11,3 N.m).The solution found by the plaintiff considerably increases the torque slip of the insert in the metal capsule, typically multiply by 6. This torque, measured according to standard NF H 35103, goes from less than 17 lbs.inch (i.e. 1.9 N.) to more than 100 lbs .inch (i.e. 11.3 Nm).
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. In fact, with all the capsules obtained according to the invention, no separation has ever been observed between the insert and the metal capsule, even with very crystallized sugar deposits.
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 the bottom of the insert (4) is placed a seal (10). The skirt of the capsule (1) carries a circular line of weakness made up 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 prior 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 FIG. 3, there is shown, in section, the "interior" varnishing of a metal strip (7) on a coil with a varnishing machine comprising a varnishing roller (71) soaking in a tank of liquid varnish (72), so as to form a coated metal strip (8), the means for drying or curing 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). Comme à la figure 3, les moyens de séchage ou de cuisson du mélange liquide (82) n'ont pas été représentés.In Figure 4, similar to Figure 3, is shown the next step where is carried out the deposition or "spot-coating" of said adherent layer on the coated metal strip (8). A screen-printing technique can be used for this, with a cylindrical grid (81) with open or closed cells depending on whether the liquid mixture (82) is to be deposited or not on the coated metal strip (8) to form after drying or baking a strip (9) coated with said layer (3). One can also use the offset process to deposit a layer of varnish on predetermined parts of the strip (8). As in Figure 3, the means for drying or cooking the liquid mixture (82) have not been shown.
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.FIG. 5a represents, in top view and in section, the circular blank (900) cut from 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 shaping the blank (900).
La figure 5d schématise, en coupe, l'assemblage de la capsule métallique de la figure 5b et d'un insert (4), par thermo scellage 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 modahté de l'invention dans laquelle la bande (90), correspondant à la bande (9) de la modahté 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.Figure 6 shows schematically in section a second modahté of the invention in which the strip (90), corresponding to the strip (9) of the previous modahté, comprises 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 extérieurIn this case, the metal strip (7) is also covered with an outer coating
(210), analogue au revêtement intérieur (21).(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 (figureFigures 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 layer (30) heat sealed by said outer layer (30). Figures 7 and 8 to 8c illustrate some non-limiting forms of these caps (12), with rounded head (Figure 12) or flat (Figures 8 to 8c), and in this case of circular section (Figure
8a), carrée (figure 8b), hexagonale (figure 8c).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. Typiquement, ladite couche adhérente (3) est un vernis thermo dur cissable comprenant de 5 à 30% en poids de ladite polyoléfine, de manière à adhérer simultanément audit insert (4) et à ladite capsule métallique (2).According to the invention, said layer (3) joining said insert (4) and said metal capsule (2) comprises a sufficient quantity of said plastic material in the divided state to ensure by high heat sealing a adhesion making it possible to respond to the problem posed. Thus, in the case where said insert is made of polyolefin, preferably of PE or PP, said layer comprises at least 3% by weight of said polyolefin. Typically, said adherent layer (3) is a hard 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 interior coating (21) formed of 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 metallic capsule (2) is made of aluminum, iron, tin, or multilayer material comprising an inner metallic layer.
Selon une modahté 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 a modahté of the invention, the closure cap (1) can comprise an attached 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 modahté non représenté sur les figures, la capsule de bouchage (1) peut comprendre, au heu d'un joint (10), un insert auto-jointant assurant par lui-même l'étanchéité requise.According to another modahté not shown in the figures, the closure cap (1) can comprise, in the place 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 hgne d'affaibhssement, ou plusieurs lignes d'affaibhssement formant une languette déchirable.In addition, the capsule (1) according to the invention may comprise means intended to facilitate the first opening, and preferably at least one hgne of weakening, or several lines of weakening forming a tear-off tab.
La figure 1 représente une capsule avec une seule hgne d'affaibhssement formée par une succession de ponts (11) qui sont rompus lors de la première ouverture.FIG. 1 represents a capsule with a single weakening shape 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 métalhque, 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 métalhque (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 métal que (2) obtenue en d), de manière à rendre ladite couche (3) adhérante audit insert (4).In this process: a) provision is made of metal strip or sheet (7) intended to form, in a manner known per se, said metal capsule, b) preferably, the entire "inside" face of said strip is formed or sheet, in a manner known per se, a layer of varnish (21), intended to allow the shaping of said metal strip or sheet, in particular by stamping and drawing, c) then forming, by marked deposit or “spot-coating”, said adherent layer (3) on the part of said “inner” 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 coated metal capsule (2) internally and locally of said adherent layer (3), e) supplying said insert (4) and assembling, by thermoforming, said insert (4) and said metal capsule as (2) obtained in d), so as to render said layer (3) adhering to said insert (4).
Ce procédé est schématisé aux figures 3 à 5e.This process is shown diagrammatically in Figures 3 to 5e.
Selon une autre modahté de l'invention représentée aux figures 6, 7 et 8 à 8c, on peut aussi former sur l'extérieur de ladite capsule métalhque 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 modahté 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 modahté of the invention represented in FIGS. 6, 7 and 8 to 8c, it is also possible to form on the outside of said metal 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 modahté, which comprises both a layer (3) on one face 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 métalhque revêtue desdites couches (3) et (30), en chauffant par induction la partie de ladite capsule métalhque recouverte desdites couches (3) et (30).Preferably, the cap (12) and the insert (4) are simultaneously fixed to said metal capsule 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 other 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 an aluminum alloy strip 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 hquide (82) destiné à former ladite couche (3) adhérant à la capsule métalhque (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. Ce vernis avait la composition suivante :On the varnished aluminum strip (8) thus obtained, a "spot-coating", as illustrated in FIG. 4, was applied, a water-resistant 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. This varnish had the following composition:
- 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). La bande ainsi revêtue a été séché à 180°C pendant 12 min.- 87 parts of commercial epoxy varnish with 31% dry extract, - 13 parts of commercial PP dispersion (MORPRIME ®) with 15% dry extract, i.e. a layer (3) containing about 6.7% in weight of PP, to within the stabilization aids (% by weight in dry matter). The thus coated strip was dried at 180 ° C for 12 min.
La bande ainsi obtenue a alimenté un dispositif classique de mise en 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. 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. 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. 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. On a en outre formé une hgne d'affaibhssement par des ponts (11) et inséré un joint (10).The strip thus obtained fed a conventional shaping device by stamping and stretching, said device comprising cutting blanks (90) feeding the stamping and stretching tool. There were thus obtained metal capsules (2) partially coated internally with said layer (3), as shown in FIG. 5b. Threaded inserts made of PP were supplied, as shown in FIG. 5c, and they were assembled to the 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 the time t was 0.15 s. 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 couple Tt such that there is softening of the PP of said layer (3) sufficient for the PP of the layer (3) to adhere to said insert (4), without there being any risk of deterioration of said insert (4), in particular by an excessive supply of calories. In addition, a weakening line was 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 métalhque (2), contrairement à ce qui était observé avec les capsules de l'état de la technique. 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.The capsules obtained according to the invention were tested on bottles containing liquors rich in sugar. In all cases, the insert (4) remained integral with the metal capsule (2), contrary to what was observed with the capsules of the prior art. Other tests have been carried out in which the layer (3) was formed only opposite a part only 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 entraînant 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 totahté 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 according to the extent and position of the layer (3) facing the insert (4): in order, the torque decreases with a layer (3) either opposite the totality of the insert, or opposite the skirt (43) of the insert, or opposite the head ( 42) of the insert.
Selon la nature des hqueurs 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 packaged scales, 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 surcoût 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 compared to the capsules of the prior art: the cost of the materials constituting the layer (3) is low taking into account the small thickness of the layer (3 ) and its limited surface area, and the varnishing operation is itself part of the standard manufacturing process.

Claims

REVENDICATIONS
1. Capsule de bouchage (1,100) à insert plastique, pour bouchage de récipients à vis, comprenant une capsule métalhque (2) constituée d'une tête et d'une jupe, un insert fileté (4) en matière plastique positionné à l'intérieur de ladite capsule métalhque et solidarisé avec celle-ci par un moyen de fixation, caractérisée en ce que ledit moyen de fixation est constitué par une couche (3) adhérant à ladite capsule métalhque (2) s'étendant sur tout ou partie de la partie de ladite capsule métalhque en regard dudit insert, en ce que ladite couche (3) comprend de ladite matière plastique à l'état divisé, et en ce qu'elle est thermoscellée audit insert (4).1. Closing cap (1,100) with plastic insert, for plugging screw receptacles, comprising a metal cap (2) consisting of a head and a skirt, a threaded insert (4) of plastic material positioned at inside of said metal capsule and secured to it by a fixing means, characterized in that said fixing means consists of a layer (3) adhering to said metal capsule (2) extending over all or part of the part of said metal capsule facing said insert, in that said layer (3) comprises said plastic material in the divided state, and in that it is heat-sealed to said insert (4).
2. Capsule selon la revendication 1 dans laquelle ladite couche (3) s'étend sur toute la partie de ladite capsule métalhque (2) en regard dudit insert (4).2. Capsule according to claim 1 wherein said layer (3) extends over the entire part of said metal capsule (2) facing said insert (4).
3. Capsule selon une quelconque des revendications 1 à 2 dans laquelle ledit insert (4) est en polyoléfine, de préférence en PE ou en PP, et dans laquelle ladite couche comprend au moins 3 % en poids de ladite polyoléfine.3. Capsule according to any one of claims 1 to 2 wherein said insert (4) is polyolefin, preferably PE or PP, and wherein said layer comprises at least 3% by weight of said polyolefin.
4. Capsule selon la revendication 3 dans laquelle ladite couche (3) est un vernis thermodurcissable comprenant de 5 à 30% en poids de ladite polyoléfine.4. Capsule according to claim 3 wherein said layer (3) is a thermosetting varnish comprising from 5 to 30% by weight of said polyolefin.
5. Capsule selon la revendication 4 dans laquelle ledit vernis est un vernis époxy.5. Capsule according to claim 4 wherein said varnish is an epoxy varnish.
6. Capsule selon la revendication 5 dans laquelle ladite capsule métalhque (2) comprend un revêtement intérieur (21) formé d'une couche de vernis époxy.6. Capsule according to claim 5 wherein said metal capsule (2) comprises an inner coating (21) formed of a layer of epoxy varnish.
7. Capsule selon une quelconque des revendications 1 à 6 dans laquelle ladite capsule métalhque (2) est en aluminium, en fer, en étain, ou matériau multicouches comprenant une couche intérieure métalhque.7. Capsule according to any one of claims 1 to 6 wherein said metalhque capsule (2) is aluminum, iron, tin, or multilayer material comprising an internal metalhque layer.
8. Capsule selon la revendication 7 comprenant un joint rapporté (10). 8. Capsule according to claim 7 comprising an attached seal (10).
9. Capsule selon la revendication 7 dans laquelle ledit insert (4) comprend un système auto-jointant.9. Capsule according to claim 7 wherein said insert (4) comprises a self-sealing system.
10. Capsule selon une quelconque des revendications 1 à 9 comprenant des moyens destinés à faciliter la première ouverture, et de préférence au moins une hgne d' affaiblissement.10. Capsule according to any one of claims 1 to 9 comprising means for facilitating the first opening, and preferably at least one hgne of weakening.
11. Capsule selon une quelconque des revendications 1 à 10 comprenant un capuchon extérieur (12) fixé à ladite capsule métalhque (2) grâce à une couche externe (30) analogue à ladite couche (3).11. Capsule according to any one of claims 1 to 10 comprising an outer cap (12) fixed to said metal capsule (2) by an outer layer (30) similar to said layer (3).
12. Procédé de fabrication de capsules selon une quelconque des revendications 1 à 11 dans lequel : a) on approvisionne de la bande ou feuille métalhque (7) destinée à former de façon connue en elle-même ladite capsule métalhque, b) de préférence, on forme sur la totahté de la face « intérieure » de ladite bande ou feuille, de manière connue en elle-même, un revêtement (21) de vernis, destiné à permettre la mise en forme de ladite bande ou feuille métalhque, notamment par emboutissage et étirage, c) on forme ensuite, par dépôt repéré ou « spot-coating », ladite couche (3) sur la partie de ladite face « intérieure » destinée à se trouver, en regard de tout ou partie dudit insert12. Method for manufacturing capsules according to any one of claims 1 to 11, in which: a) provision is made of metal tape or sheet (7) intended to form, in a manner known per se, said metal capsule, preferably b), a coating (21) of varnish is formed on the totality of the "inside" face of said strip or sheet, in a manner known per se, intended to allow the shaping of said metal strip or sheet, in particular by stamping and stretching, c) then forming, by marked deposition or “spot-coating”, said layer (3) on the part of said “interior” face intended to be located, facing all or part of said insert
(4), 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 métalhque (2) revêtue intérieurement et localement de ladite couche adhérente (3), e) on approvisionne ledit insert (4) et on assemble, par thermo formage, ledit insert (4) et ladite capsule métalhque obtenue en d), de manière à rendre ladite couche (3) adhérante audit insert (4). (4), d) the sheet or strip (9) obtained in c) is shaped so as to obtain, in a manner known per se, said metal 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 obtained in d), so as to make said layer (3) adherent to 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

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

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EP (1) EP1009674B1 (en)
CN (1) CN1260758A (en)
AT (1) ATE232817T1 (en)
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CA (1) CA2289589A1 (en)
DE (1) DE69811515T2 (en)
DK (1) DK1009674T3 (en)
FR (1) FR2763046B1 (en)
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AU7659198A (en) 1998-12-08
FR2763046B1 (en) 1999-06-04
US6403173B1 (en) 2002-06-11
ATE232817T1 (en) 2003-03-15
DE69811515D1 (en) 2003-03-27
DK1009674T3 (en) 2003-06-16
CN1260758A (en) 2000-07-19
FR2763046A1 (en) 1998-11-13
EP1009674B1 (en) 2003-02-19
WO1998051581A1 (en) 1998-11-19
DE69811515T2 (en) 2004-03-18
CA2289589A1 (en) 1998-11-19

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