FR2707549A1 - Process for making a cylindrical plastic body with a cellular structure, in particular a stopper (cap), and body obtained by such a process - Google Patents

Process for making a cylindrical plastic body with a cellular structure, in particular a stopper (cap), and body obtained by such a process Download PDF

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Publication number
FR2707549A1
FR2707549A1 FR9309065A FR9309065A FR2707549A1 FR 2707549 A1 FR2707549 A1 FR 2707549A1 FR 9309065 A FR9309065 A FR 9309065A FR 9309065 A FR9309065 A FR 9309065A FR 2707549 A1 FR2707549 A1 FR 2707549A1
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FR
France
Prior art keywords
mold
stopper
cellular structure
cap
capacity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR9309065A
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French (fr)
Inventor
Bertin Claude
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR9309065A priority Critical patent/FR2707549A1/en
Publication of FR2707549A1 publication Critical patent/FR2707549A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/08—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles using several expanding or moulding steps
    • B29C44/083—Increasing the size of the cavity after a first part has foamed, e.g. substituting one mould part with another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0407—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by regulating the temperature of the mould or parts thereof, e.g. cold mould walls inhibiting foaming of an outer layer
    • 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
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
    • 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
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
    • B65D39/0005—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in one piece
    • B65D39/0011—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in one piece from natural or synthetic cork, e.g. for wine bottles or the like
    • 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
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
    • B65D39/0052—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in more than one piece
    • B65D39/0058—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in more than one piece from natural or synthetic cork, e.g. for wine bottles or the like

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

Abstract

The subject of the invention is a process for making a cylindrical body having a cellular structure, and the body obtained. This process consists in injecting (1) a thermoplastic (4) into a mould (2) having a variable volume, and in increasing (5) the said volume, the material (4) still being in the pasty state and the mould (2) being hermetically sealed (3), in such a way that the body obtained comprises an internal region (10) having a cellular structure (6) and being encased with a cell-free solid region (8). Application to the manufacture of stoppers, in particular for bottles with a neck.

Description

L'invention est du domaine des techniques de fabrication, et plus particulièrement du travail des matières plastiques, et elle a pour objet un procédé visant l'élaboration d'un corps cylindrique présentant une structure alvéolaire, notamment pour la fabrication d'un bouchon, ainsi que le corps cylindrique obtenu par la mise en oeuvre d'un tel procédé. The invention is in the field of manufacturing techniques, and more particularly in the working of plastics, and it relates to a process aimed at the development of a cylindrical body having a cellular structure, in particular for the manufacture of a plug, as well as the cylindrical body obtained by the implementation of such a process.

On connaît des bouchons en liège pour bouteille à goulot présentant une structure alvéolaire. Ces bouchons ont les inconvénients d'être putrescibles et de pouvoir altérer de façon imprévisible le liquide contenu dans la bouteille. There are known cork stoppers for bottled bottles having a honeycomb structure. These caps have the disadvantages of being putrescible and of being able to alter the liquid contained in the bottle in an unpredictable manner.

On connaît aussi des bouchons élaborés en matière plastique pleine et globalement conformés en cylindre évidé pourvu d'une collerette. There are also known plugs made of solid plastic material and generally shaped into a hollow cylinder provided with a flange.

On connaît encore des corps cylindriques, tels que capsules, élaborés en matière plastique alvéolaire et conformés en disque. La structure alvéolaire de la matière plastique est généralement obtenue par adjonction d'un produit volatile lors de l'opération de moulage. Cylindrical bodies are also known, such as capsules, made of cellular plastic and shaped like a disc. The cellular structure of the plastic is generally obtained by adding a volatile product during the molding operation.

Le but de l'invention est de proposer un bouchon pour bouteille à goulot, le dit bouchon étant en matière plastique, réputée pour son inertie et son imperméabilité y compris au gaz, et présentant une conformation et une structure rappelant celles des bouchons en liège ; on attend d'un tel bouchon, d'une part d'assumer avec une grande fiabilité sa fonction de bouchage (étanchéité) et une manipulation comparable à celle des bouchons traditionnels. The object of the invention is to propose a stopper for a bottle with a neck, said stopper being made of plastic material, known for its inertia and its impermeability, including gas, and having a conformation and a structure reminiscent of those of cork stoppers; such a stopper is expected, on the one hand to assume with great reliability its stoppering function (sealing) and a handling comparable to that of traditional stoppers.

Selon l'invention, un procédé visant l'élaboration d'un bouchon répondant au but susmentionné est principalement caractérisé en ce qu'il consiste
- à injecter une matière thermoplastique dans un moule à capacité variable, et
- à augmenter la dite capacité, la matière étant encore à l'état pâteux et le moule étant rendu hermétique, de manière à ce que la matière tende à combler la totalité de la capacité du moule.According to the invention, a process aimed at the production of a stopper meeting the above-mentioned aim is mainly characterized in that it consists
- injecting a thermoplastic material into a mold with variable capacity, and
- To increase said capacity, the material still being in a pasty state and the mold being made airtight, so that the material tends to fill the entire capacity of the mold.

Il résulte de ces dispositions un phénomène générateur de la structure alvéolaire recherchée, le refroidissement rapide de la matière aux environs des parois du moule induisant une structure à alvéoles fermées par la survenance d'une peau en matière pleine qui enveloppe totalement la zone interne à structure alvéolaire du corps obtenu. The result of these provisions is a phenomenon generating the desired cellular structure, the rapid cooling of the material around the walls of the mold inducing a closed cell structure by the occurrence of a skin of solid material which completely envelops the internal zone with structure. alveolar of the body obtained.

Selon une mise en oeuvre plus élaborée du procédé de l'invention, on pourra éventuellement refroidir plus ou moins les parois du moule pour durcir de façon rapide plus ou moins profondément la zone périphérique du corps, et de ce fait pour rendre la peau plus ou moins épaisse. On comprendra par zone périphérique, tant la face cylindrique que les faces d'extrémités du corps. According to a more elaborate implementation of the process of the invention, the walls of the mold can be cooled more or less to harden the peripheral zone of the body more or less quickly, and thereby to make the skin more or less less thick. Peripheral zone will be understood to include both the cylindrical face and the end faces of the body.

La présente invention sera mieux comprise et des détails en relevant apparaîtront à la description qui va être faite d'une forme préférée de réalisation, en relation avec les figures de la planche annexée, dans laquelle
les fig.1 à 3 sont des schémas successifs illustrant un procédé de l'invention,
la fig.4 est une illustration en perspective d'un corps partiellement coupé obtenu par la mise en oeuvre d'un tel procédé.The present invention will be better understood and details will be apparent from the description which will be given of a preferred embodiment, in relation to the figures in the appended plate, in which
FIGS. 1 to 3 are successive diagrams illustrating a method of the invention,
Fig.4 is a perspective illustration of a partially cut body obtained by the implementation of such a method.

Sur les fig.1 à 3, on injecte (1) (fig.1) à l'intérieur d'un moule 2 à capacité variable une matière thermoplastique 4, puis (fig.3), la matière 4 étant encore à l'état pâteux, on rend le moule 2 hermétique (3) et on augmente (5) (fig.3) sa capacité. La matière 4 tend (7) à combler la totalité de la capacité du moule 2, et un phénomène générateur d'alvéoles, telles que 6, dans la matière 4 se produit. In fig. 1 to 3, a thermoplastic material 4 is injected (1) (fig. 1) inside a mold 2 with variable capacity, then (fig. 3), the material 4 still being pasty state, make the mold 2 airtight (3) and increase (5) (fig.3) its capacity. The material 4 tends (7) to fill the entire capacity of the mold 2, and a phenomenon generating cells, such as 6, in the material 4 occurs.

On notera toutefois que la matière 4 s'étant rapidement refroidie aux environs des parois du moule 2, le phénomène ne se produit que dans une zone interne 10 et qu'une peau 8 de matière pleine se forme au contact des dites parois. However, it will be noted that the material 4 having rapidly cooled around the walls of the mold 2, the phenomenon only occurs in an internal zone 10 and that a skin 8 of solid material is formed in contact with said walls.

Sur la fig.4, un bouchon 12 obtenu par la mise en oeuvre d'un procédé de l'invention est reconnaissable dans le fait qu'il comporte une zone interne 10 présentant une structure alvéolaire, la dite zone interne 10 étant totalement enveloppée d'une peau pleine 8 exempte d'alvéoles. In fig.4, a plug 12 obtained by the implementation of a method of the invention is recognizable in the fact that it comprises an internal zone 10 having a honeycomb structure, said internal zone 10 being completely enveloped by '' a full skin 8 free of alveoli.

On remarquera que la peau 8 enveloppe le bouchon 12, tant sur ses faces d'extrémités que sur sa face cylindrique. It will be noted that the skin 8 envelops the plug 12, both on its end faces and on its cylindrical face.

La peau 8 peut être rendue plus ou moins épaisse lors de l'élaboration du bouchon 12, en refroidissant plus ou moins les parois du moule 2. The skin 8 can be made more or less thick during the preparation of the plug 12, by more or less cooling the walls of the mold 2.

Des matières plastiques se prêtant bien à la réalisation de l'invention et assurant au bouchon une neutralité à l'égard du liquide contenu, sont les polyéthylènes et polypropylènes non plastifiés. Plastics which lend themselves well to the implementation of the invention and which provide the stopper with neutrality with regard to the liquid contained, are unplasticized polyethylenes and polypropylenes.

Bien que l'on ait décrit et représenté un procédé et une forme préférés de réalisation de l'invention, il doit être compris que la portée de cette dernière n'est pas limitée à ce procédé et à cette forme mais qu'elle s'étend à tout procédé, et corps obtenu par la mise en oeuvre d'un tel procédé, comportant les caractéristiques énoncées plus haut.  Although a preferred method and embodiment of the invention has been described and shown, it should be understood that the scope of the latter is not limited to this method and this form but that it is extends to any process, and body obtained by the implementation of such a process, comprising the characteristics set out above.

Claims (4)

REVENDICATIONS 1.- Bouchon de forme générale cylindrique pour le bouchage1.- Cap of generally cylindrical shape for capping des bouteilles à goulot notamment, de genre de bouchon en neck bottles in particular, of the kind of stopper matière plastique, caractérisé plastic material, characterized en ce qu'il comporte une zone interne in that it has an internal area (10) présentant une structure alvéolaire (6), la dite (10) having a honeycomb structure (6), the so-called zone interne (10) étant totalement enveloppée d'une peau internal area (10) being completely wrapped in skin pleine (8) exempte d'alvéoles. full (8) free of cells. 2.- Bouchon selon la revendication 1, caractérisé2.- plug according to claim 1, characterized en ce que la matière qui le constitue in that the material which constitutes it est l'une des matières plastiques du groupe comprennant is one of the plastics of the group including le polyéthylène et le polypropylène; 3.- Procédé visant à l'élaboration d'un corps cylindrique en polyethylene and polypropylene; 3.- Process aiming at the elaboration of a cylindrical body in une matière plastique présentant une structure a plastic having a structure alvéolaire, notamment un bouchon selon l'une quelconque cellular, in particular a plug according to any one des revendications 1 et 2, caractérisé claims 1 and 2, characterized en ce qu'il consiste that it consists - à injecter (1) une matière thermoplastique (4) dans un - injecting (1) a thermoplastic material (4) into a moule (2) à capacité variable, et variable capacity mold (2), and - à augmenter (5) la dite capacité, la matière (4) étant - to increase (5) said capacity, the material (4) being encore à l'état pâteux et le moule (2) étant hermétique still in a pasty state and the mold (2) being hermetic (3), (3), de telle sorte que la matière (4) tende à combler (7) la so that the material (4) tends to fill (7) the totalité de la capacité du moule (2) ; full capacity of the mold (2); 4.- Procédé selon la revendication 3 caractérisé 4.- Method according to claim 3 characterized en ce qu'il consiste à refroidir plus in that it involves cooling more ou moins les parois du moule (2) pour durcir de façon or less the walls of the mold (2) to harden so rapide plus ou moins profondément la zone périphérique faster more or less deeply the peripheral area (8) du corps, (8) of the body, de telle sorte que la dite zone périphérique (8), plus so that the said peripheral zone (8), more dense que la zone interne (10) du corps, soit plus ou dense than the internal area (10) of the body, either more or moins épaisse  thinner
FR9309065A 1993-07-16 1993-07-16 Process for making a cylindrical plastic body with a cellular structure, in particular a stopper (cap), and body obtained by such a process Withdrawn FR2707549A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9309065A FR2707549A1 (en) 1993-07-16 1993-07-16 Process for making a cylindrical plastic body with a cellular structure, in particular a stopper (cap), and body obtained by such a process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9309065A FR2707549A1 (en) 1993-07-16 1993-07-16 Process for making a cylindrical plastic body with a cellular structure, in particular a stopper (cap), and body obtained by such a process

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Publication Number Publication Date
FR2707549A1 true FR2707549A1 (en) 1995-01-20

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998016364A2 (en) * 1996-10-11 1998-04-23 Coraltech Limited Method of injection moulding a foamed article
EP0839624A2 (en) * 1996-11-01 1998-05-06 Honda Giken Kogyo Kabushiki Kaisha Molded article and method for producing the same
GB2333739A (en) * 1996-10-11 1999-08-04 Coraltech Ltd Method of injection moulding a foamed article
EP1051334A1 (en) * 1997-04-24 2000-11-15 Nomacorc, L.L.C. Synthetic closure
EP1179485A1 (en) * 2000-08-01 2002-02-13 Mondo S.p.A. Stopper for wine bottles
EP1226918A1 (en) * 1999-08-30 2002-07-31 Sekisui Chemical Co., Ltd. Production method for thermoplastic resin foam, molding mold therefor and thermoplastic resin foam
EP1705127A2 (en) * 2005-03-23 2006-09-27 Milova Plast S.R.L. Synthetic stopper for glass bottles

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2333739B (en) * 1996-10-11 2001-03-21 Coraltech Ltd Foamed article
US6358446B1 (en) 1996-10-11 2002-03-19 Coraltech Limited Method of injection moulding a foamed article
WO1998016364A3 (en) * 1996-10-11 1998-06-18 Coraltech Ltd Method of injection moulding a foamed article
WO1998016364A2 (en) * 1996-10-11 1998-04-23 Coraltech Limited Method of injection moulding a foamed article
GB2333739A (en) * 1996-10-11 1999-08-04 Coraltech Ltd Method of injection moulding a foamed article
US6299807B1 (en) 1996-11-01 2001-10-09 Honda Giken Kogyo Kabushiki Kaisha Method for producing molded article
US5972491A (en) * 1996-11-01 1999-10-26 Honda Giken Kogyo Kabushiki Kaisha Molded article and method for producing the same
EP1208954A3 (en) * 1996-11-01 2002-06-12 Honda Giken Kogyo Kabushiki Kaisha Molded article and method for producing the same
EP0839624A3 (en) * 1996-11-01 1999-04-28 Honda Giken Kogyo Kabushiki Kaisha Molded article and method for producing the same
EP0839624A2 (en) * 1996-11-01 1998-05-06 Honda Giken Kogyo Kabushiki Kaisha Molded article and method for producing the same
EP1208954A2 (en) * 1996-11-01 2002-05-29 Honda Giken Kogyo Kabushiki Kaisha Molded article and method for producing the same
EP1051334A1 (en) * 1997-04-24 2000-11-15 Nomacorc, L.L.C. Synthetic closure
EP1051334A4 (en) * 1997-04-24 2001-08-29 Nomacorc L L C Synthetic closure
EP1226918A4 (en) * 1999-08-30 2002-10-16 Sekisui Chemical Co Ltd Production method for thermoplastic resin foam, molding mold therefor and thermoplastic resin foam
EP1226918A1 (en) * 1999-08-30 2002-07-31 Sekisui Chemical Co., Ltd. Production method for thermoplastic resin foam, molding mold therefor and thermoplastic resin foam
US7195815B1 (en) 1999-08-30 2007-03-27 Sekisui Chemical Co., Ltd. Process for producing foamed body of thermoplastic resin, mold for forming same and foamed body of thermoplastic resin
US7833445B2 (en) 1999-08-30 2010-11-16 Sekisui Chemical Co., Ltd. Process for producing foamed body of thermoplastic resin
EP1179485A1 (en) * 2000-08-01 2002-02-13 Mondo S.p.A. Stopper for wine bottles
EP1705127A2 (en) * 2005-03-23 2006-09-27 Milova Plast S.R.L. Synthetic stopper for glass bottles
EP1705127A3 (en) * 2005-03-23 2009-04-08 Milova Plast S.R.L. Synthetic stopper for glass bottles

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