FR2684916A1 - MANUFACTURE OF PLASTIC ARTICLES. - Google Patents

MANUFACTURE OF PLASTIC ARTICLES. Download PDF

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Publication number
FR2684916A1
FR2684916A1 FR9212855A FR9212855A FR2684916A1 FR 2684916 A1 FR2684916 A1 FR 2684916A1 FR 9212855 A FR9212855 A FR 9212855A FR 9212855 A FR9212855 A FR 9212855A FR 2684916 A1 FR2684916 A1 FR 2684916A1
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FR
France
Prior art keywords
mold
formation
segments
parasitic
energy
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
FR9212855A
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French (fr)
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FR2684916B1 (en
Inventor
Green Stephen Paul
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.)
Continental Automotive Telford UK Ltd
Original Assignee
Dunlop Automotive Composites UK Ltd
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Application filed by Dunlop Automotive Composites UK Ltd filed Critical Dunlop Automotive Composites UK Ltd
Publication of FR2684916A1 publication Critical patent/FR2684916A1/en
Application granted granted Critical
Publication of FR2684916B1 publication Critical patent/FR2684916B1/fr
Granted legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B22C7/026—Patterns made from expanded plastic materials by assembling preformed parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/26—Seam welding of rectilinear seams
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1282—Stepped joint cross-sections comprising at least one overlap joint-segment
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1284—Stepped joint cross-sections comprising at least one butt joint-segment
    • B29C66/12841—Stepped joint cross-sections comprising at least one butt joint-segment comprising at least two butt joint-segments
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/14—Particular design of joint configurations particular design of the joint cross-sections the joint having the same thickness as the thickness of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/322—Providing cavities in the joined article to collect the burr
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/547—Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles, e.g. endless tubes
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1632—Laser beams characterised by the way of heating the interface direct heating the surfaces to be joined
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1687—Laser beams making use of light guides
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
    • B29C66/73941—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset characterised by the materials of both parts being thermosets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/757—Moulds, cores, dies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Procédé de fabrication d'articles en matière plastique comprenant l'utilisation d'un moule à plusieurs segments (10, 11) en matériau fusible, définissant, au moins en partie, une cavité de moulage (16). Avant le moulage, les segments du moule sont disposés selon une orientation prédéterminée et les zones de bord (14, 15) des surfaces opposées (12, 13) des segments sont soumises à l'application de l'énergie d'un faisceau laser pour raccorder les segments du moule et enlever les formations parasites dans la zone de bord.A method of manufacturing plastic articles comprising the use of a mold with several segments (10, 11) of fusible material, defining, at least in part, a molding cavity (16). Before molding, the mold segments are arranged in a predetermined orientation and the edge areas (14, 15) of the opposite surfaces (12, 13) of the segments are subjected to the application of the energy of a laser beam to connect the mold segments and remove parasitic formations in the edge area.

Description

L'invention concerne la fabrication d'articles en matière plastique et, enThe invention relates to the manufacture of plastic articles and, in

particulier, mais non exclusivement, la fabrication d'articles selon le procédé dit "à noyau perdu", dans lequel la matière plastique est moulée à l'aide d'un élément de moule formant noyau fusible, pouvant être constitué par une pluralité de segments et qui, après moulage, est enlevé par chauffage de l'élément de moule formant noyau jusqu'à la fusion, de manière à pouvoir s'écouler d'une cavité définie dans celui- ci par la matière  particular, but not exclusively, the manufacture of articles according to the so-called "lost core" process, in which the plastic material is molded using a mold element forming a fusible core, which may be constituted by a plurality of segments and which, after molding, is removed by heating the core mold element until it melts, so as to be able to flow from a cavity defined in it by the material

plastique moulée.molded plastic.

Un problème qui se pose fréquemment dans la fabrication d'articles en matière plastique faisant appel à une technique de moulage est qu'il se produit des formations parasites, telles que, par exemple, des bavures ou jointures de matériau excédentaire au voisinage du point d'injection de matériau dans le moule Ces formations parasites apparaissent également en d'autres endroits de l'article lorsque le moulage est effectué à l'aide d'un moule du type à plusieurs segments. Dans la fabrication de précision d'articles pour l'industrie mécanique, l'enlèvement des bavures et autres formations parasites doit se faire avec précaution, ce qui implique une augmentation de temps de fabrication et de prix de revient Cet enlèvement est particulièrement difficile si ces formations sont situées sur des surfaces difficilement accessibles de la pièce moulée, comme dans le cas d'un article de forme complexe, moulé selon la technique de moulage dite à noyau perdu avec un moule à plusieurs segments. La difficulté d'enlever ces protubérances parasites n'est pas excessive à condition de choisir des matières plastiques de type particulier, telles que des matières plastiques thermodurcissables Toutefois, dans de nombreux produits, la fragilité relative et le coût élevé des matières plastiques thermodurcissables, comparativement, par exemple,  A common problem in the manufacture of plastic articles using a molding technique is that parasitic formations occur, such as, for example, burrs or seams of excess material in the vicinity of the point of d injection of material into the mold These parasitic formations also appear in other places of the article when the molding is carried out using a mold of the type with several segments. In the precision manufacturing of articles for the mechanical industry, the removal of burrs and other parasitic formations must be done with care, which implies an increase in manufacturing time and cost. This removal is particularly difficult if these formations are located on hard to reach surfaces of the molded part, as in the case of an article of complex shape, molded according to the so-called lost core molding technique with a mold with several segments. The difficulty in removing these parasitic protuberances is not excessive provided that plastics of a particular type are chosen, such as thermosetting plastics. However, in many products, the relative brittleness and the high cost of thermosetting plastics, comparatively , for example,

aux matières thermoplastiques, font que les matières plas-  to thermoplastics, make plas-

tiques thermodurcissables ne conviennent pas.  thermosetting ticks are not suitable.

La présente invention vise à prévoir un procédé per-  The present invention aims to provide a per-

mettant d'éviter ou d'atténuer ledit problème de formations parasites, classiquement lié à la fabrication des produits en  avoiding or alleviating said problem of parasitic formations, conventionally linked to the manufacture of products in

matière plastique et, en particulier, en matériaux thermo-  plastic and, in particular, thermally

plastiques. Selon l'un des aspects de l'invention, il est prévu un procédé de fabrication d'un article en matière plastique moulée comprenant l'utilisation d'un moule à plusieurs segments, en matériau fusible, définissant, au moins en partie, une cavité pour le moulage des matières plastiques dans lequel, avant le moulage de la matière plastique, les segments du moule sont disposés dans une orientation prédéterminée les uns par rapport aux autres, et les zones de bordure des surfaces en opposition des segments sont soumises à l'énergie d'un faisceau laser pour assembler mutuellement les segments du moule, au moins dans ladite zone de bord et pour enlever les formations parasites éventuelles desdites  plastics. According to one aspect of the invention, there is provided a method for manufacturing an article of molded plastic material comprising the use of a mold with several segments, made of fusible material, defining, at least in part, a cavity for molding plastics in which, before molding the plastic, the mold segments are arranged in a predetermined orientation with respect to each other, and the border areas of the surfaces in opposition to the segments are subjected to the energy of a laser beam to assemble the mold segments mutually, at least in said edge area and to remove any parasitic formations from said

zones de bord.edge areas.

L'invention prévoit en outre un procédé dans lequel, au moins l'une desdites zones de bord est pourvue d'une formation parasite en forme de nervure, servant de source de matériau de remplissage lors de son chauffage au faisceau laser, pour remplir les petits interstices entre les surfaces opposées des segments du moule et faciliter la formation d'un  The invention further provides a method in which at least one of said edge zones is provided with a parasitic formation in the form of a rib, serving as a source of filling material when heated with the laser beam, for filling the small gaps between opposite surfaces of the mold segments and facilitate the formation of a

joint à surface lisse.seal with smooth surface.

L'une desdites surfaces opposées peut être pourvue d'une formation en butée déformable qui se déforme, de préférence, lorsque les surfaces opposées sont sollicitées l'une vers l'autre, de manière à créer sensiblement un joint entre les deux La formation en butée peut s'étendre longitudinalement, de préférence de façon continue, et est disposée, de préférence, à proximité de l'une desdites zones de bord devant être soumise à ladite énergie du faisceau laser La formation s'étendant longitudinalement peut être rectiligne  One of said opposite surfaces can be provided with a deformable abutment formation which preferably deforms when the opposite surfaces are biased towards each other, so as to substantially create a joint between the two. stop can extend longitudinally, preferably continuously, and is arranged, preferably, near one of said edge areas to be subjected to said laser beam energy The formation extending longitudinally can be straight

et/ou courbe.and / or curve.

Selon un autre aspect de l'invention, il est prévu un procédé de fabrication d'un article moulé en matière plastique dans lequel ledit article est réalisé selon une technique connue en soi, provoquant une formation parasite sur ledit article, ce dernier étant soumis à l'énergie d'un faisceau laser dirigé sur la formation parasite On peut utiliser le faisceau laser pour enlever la formation parasite par découpage ou par fusion, de manière à le raccorder au matériau adjacent constituant le corps de l'article en  According to another aspect of the invention, there is provided a method for manufacturing a molded plastic article in which said article is produced according to a technique known per se, causing parasitic formation on said article, the latter being subjected to the energy of a laser beam directed on the parasitic formation The laser beam can be used to remove the parasitic formation by cutting or by fusion, so as to connect it to the adjacent material constituting the body of the article in

matière plastique.plastic material.

L'invention prévoit, en particulier, que la matière  The invention provides, in particular, that the material

plastique sera une matière de type thermoplastique.  plastic will be a thermoplastic type material.

Toutefois, on peut utiliser également des matériaux thermodurcissables. De préférence, l'énergie du faisceau laser est dirigée sur la surface de l'article en matière plastique ou sur le moule à plusieurs segments, dans une direction sensiblement perpendiculaire, soit à la surface de l'article en matière plastique, au voisinage de la formation parasite, soit sensiblement perpendiculaire à la surface du moule, au  However, thermosetting materials can also be used. Preferably, the energy of the laser beam is directed onto the surface of the plastic article or onto the multi-segment mold, in a direction substantially perpendicular to the surface of the plastic article, in the vicinity of parasitic formation, that is to say substantially perpendicular to the surface of the mold,

voisinage d'une zone de bord localisée.  vicinity of a localized edge area.

L'énergie du faisceau laser peut être appliquée selon un procédé quelconque connu, et peut être convenablement désaccordée lorsqu'un faible niveau d'énergie est requis, comme dans les cas copurants Pour créer un joint uniforme entre deux segments d'un moule à plusieurs segments, et pour éviter ainsi toutes irrégularités de surface dans les zones  The energy of the laser beam can be applied according to any known method, and can be suitably detuned when a low level of energy is required, as in the case of oxidizers. To create a uniform joint between two segments of a mold with several segments, and to avoid any surface irregularities in the areas

opposées de l'article moulé, il est particulièrement sou-  opposite of the molded article, it is particularly

haitable d'utiliser une impulsion laser modelée, adaptée de manière à éviter la pointe d'énergie initiale au cours de  haitable to use a laser pulse modeled, adapted so as to avoid the initial energy peak during

chaque impulsion.every pulse.

La présente invention prévoit également que, dans une paire de segments de moule en matériau fusible comportant des surfaces respectives opposées l'une par rapport à l'autre, lorsqu'ils sont assemblés de manière à définir, au moins en partie, un moule, l'une des surface soit pourvue d'une zone de réception (telle qu'une rainure ou une fente) ménagée dans un bord, exposée lorsque les surfaces opposées sont en contact et que l'autre surface soit pourvue d'un bord exposé de façon analogue, muni d'une nervure de remplissage, de manière que l'énergie du rayon laser appliquée sur la nervure de remplissage ou à proximité de celle-ci, provoque l'écoulement du matériau excédentaire de la nervure de remplissage dans la zone de réception, de manière à la remplir Les deux segments de moule peuvent être réunis par  The present invention also provides that, in a pair of mold segments of fusible material having respective surfaces opposite to each other, when they are assembled so as to define, at least in part, a mold, one of the surfaces is provided with a receiving area (such as a groove or a slot) formed in an edge, exposed when the opposite surfaces are in contact and the other surface is provided with an exposed edge of similarly, provided with a filling rib, so that the energy of the laser beam applied to or near the filling rib causes the excess material of the filling rib to flow into the region of reception, so as to fill it The two mold segments can be joined by

ledit matériau coulant dans la zone de réception.  said material flowing in the reception area.

La présente invention prévoit également que, dans une paire de segments de moule en matériau fusible, comportant des surfaces respectives opposées l'une par rapport à l'autre pour définir, au moins en partie, un moule, au moins l'une desdites surfaces soit pourvue d'une formation en butée déformable, agencée pour se déformer lorsque lesdites surfaces sont sollicitées l'une vers l'autre De préférence, la formation en butée est, longitudinalement, sensiblement continue de manière à former un joint sensiblement continu entre les surfaces opposées lorsqu'elles sont sollicitées l'une vers l'autre De préférence, la formation en butée est prévue sur ladite surface opposée située dans une position voisine d'un bord de la surface devant être soumise à  The present invention also provides that, in a pair of mold segments of fusible material, having respective surfaces opposite to each other to define, at least in part, a mold, at least one of said surfaces is provided with a deformable abutment formation, arranged to deform when said surfaces are biased towards each other Preferably, the abutment formation is, longitudinally, substantially continuous so as to form a substantially continuous joint between the surfaces opposite when they are biased towards each other Preferably, the abutment formation is provided on said opposite surface located in a position close to an edge of the surface to be subjected to

l'énergie du faisceau laser.the energy of the laser beam.

Il n'est pas essentiel que les deux segments de moule soient réunis sur une zone de bord exposée ou uniquement sur celle-ci Les segments de moule peuvent être soumis à une technique de soudage en profondeur, dans laquelle les surfaces opposées sont soudées mutuellement dans une position située dans le corps du matériau du moule, au dessous de la  It is not essential that the two mold segments are joined on or only on an exposed edge area The mold segments can be subjected to a deep welding technique, in which the opposing surfaces are welded together in a position located in the body of the mold material, below the

zone de bord exposée.exposed edge area.

26849162684916

D'autres buts, avantages et caractéristiques appa-  Other purposes, advantages and features appear

raîtront à la lecture de la description des modes de  will read on reading the description of the

réalisation de l'invention, faite à titre non limitatif et en regard des dessins annexés, dans lesquels: La figure 1 est une vue en perspective d'une paire de segments de moule selon la présente invention, et la figure 2 est une vue en perspective d'une paire de segments de moule selon un autre mode de réalisation de la  embodiment of the invention, made without limitation and with reference to the accompanying drawings, in which: FIG. 1 is a perspective view of a pair of mold segments according to the present invention, and FIG. 2 is a view in perspective of a pair of mold segments according to another embodiment of the

présente invention.present invention.

La figure 1 illustre deux segments de moule identiques , 11 prévus pour être assemblés mutuellement par un procédé selon la présente invention Chaque segment de moule 10, 11 est de forme tubulaire, sensiblement semicirculaire et comprend une paire de surfaces 12, 13 en opposition par rapport aux surfaces de l'autre segment Un segment 10 est pourvu de zones formant surface de contact 12, dont les bords tournés radialement vers l'intérieur sont pourvus d'une formation en forme de nervure parasite 14 constituée par le matériau du segment de moule Les faces 13 de l'autre segment  FIG. 1 illustrates two identical mold segments, 11 intended to be assembled together by a method according to the present invention Each mold segment 10, 11 is of tubular shape, substantially semicircular and comprises a pair of surfaces 12, 13 in opposition with respect to to the surfaces of the other segment A segment 10 is provided with zones forming a contact surface 12, the edges of which face radially inwards are provided with a parasitic rib-shaped formation 14 formed by the material of the mold segment Les sides 13 of the other segment

de moule 11 sont pourvues de rainures 15, s'étendant longi-  mold 11 are provided with grooves 15, extending long

tudinalement, ménagées également dans leurs bords intérieurs radiaux. Lorsque les deux segments de moule sont assemblés mutuellement, dans la configuration illustrée sur les dessins annexés, l'énergie d'un faisceau laser est dirigée sur chaque nervure de remplissage 14, typiquement à l'aide d'un ensemble à fibres optiques susceptible d'être introduit dans l'alésage ( 16) défini par la paire de segments L'ensemble de fibres optiques est incurvé de manière à diriger l'énergie du faisceau laser radialement vers l'extérieur, dans une direction sensiblement perpendiculaire à la zone de surface  tudinally, also arranged in their inner radial edges. When the two mold segments are assembled together, in the configuration illustrated in the accompanying drawings, the energy of a laser beam is directed onto each filling rib 14, typically using a fiber optic assembly capable of '' be introduced into the bore (16) defined by the pair of segments The set of optical fibers is curved so as to direct the energy of the laser beam radially outward, in a direction substantially perpendicular to the surface area

localisée d'une paire de bords exposés des surfaces opposées.  located of a pair of exposed edges of opposite surfaces.

Le niveau d'énergie est réglé de manière à provoquer un écoulement de matériau, de la nervure de remplissage 14 jusque dans la rainure adjacente 15, servant de zone de réception de ce matériau Le niveau de chaleur appliqué est suffisant pour amollir le matériau moulé qui définit la rainure 15 s'étendant longitudinalement et de manière à former un joint entre les deux segments de moule au moyen du matériau de la nervure de remplissage. Le procédé décrit plus haut est appliqué lorsque la nervure de remplissage et la rainure sont tournées l'une vers l'autre, verticalement en remontant, de manière que le matériau de la nervure de remplissage ait naturellement tendance à couler dans la rainure Après quoi, tout en maintenant les deux segments de moule par des moyens extérieurs (non représentés) dans la position relative requise, on effectue une rotation des segments de 1800 autour de l'axe longitudinal de l'alésage 16 et on applique le procédé ci- dessus à l'autre nervure de remplissage et à la rainure. On obtient ainsi un moule comportant un alésage sensiblement uniforme, dans lequel un article peut être moulé sans formation de jointures ou bavures ou autres formations parasites qui apparaîtraient sinon normalement si l'on  The energy level is adjusted so as to cause a flow of material, from the filling rib 14 into the adjacent groove 15, serving as a zone for receiving this material. The level of heat applied is sufficient to soften the molded material which defines the groove 15 extending longitudinally and so as to form a seal between the two mold segments by means of the material of the filling rib. The method described above is applied when the filling rib and the groove are turned towards each other, vertically upward, so that the material of the filling rib naturally tends to flow in the groove. while maintaining the two mold segments by external means (not shown) in the required relative position, the segments of 1800 are rotated around the longitudinal axis of the bore 16 and the above method is applied to the other filling rib and to the groove. A mold is thus obtained comprising a substantially uniform bore, in which an article can be molded without the formation of seams or burrs or other parasitic formations which would otherwise appear normally if one

utilisait un simple moule, composé de deux segments semi-  used a simple mold, composed of two semi-segments

cylindriques, maintenus directement en prise en butée.  cylindrical, held directly in abutment.

Il n'est pas essentiel que les nervures de remplissage  It is not essential that the filling ribs

14 soient tournées face à face, radialement vers l'intérieur.  14 are turned face to face, radially inward.

Dans une variante du procédé décrit plus haut, les nervures de remplissage 14 peuvent être ménagées sur les bords tournés radialement vers l'extérieur des zones des faces tournées radialement vers l'extérieur, les rainures 15 étant alors ménagées sur les bords des faces 13 dirigés radialement vers  In a variant of the method described above, the filling ribs 14 can be formed on the edges facing radially outward from the areas of the faces facing radially outward, the grooves 15 then being formed on the edges of the facing faces 13 radially towards

l'extérieur.outside.

La figure 2 représente les deux segments de moule 20,  FIG. 2 represents the two mold segments 20,

21, chacun d'eux étant de forme tubulaire, sensiblement semi-  21, each of them being of tubular shape, substantially semi

cylindrique et comprenant une paire de faces 22, 23 tournées vers les faces opposées de l'autre segment Un segment 21 comprend deux faces 23, chacune d'elles étant ménagée à proximité de leur bord intérieur radial 24, avec une petite formation en butée déformable 25 réalisée monobloc avec le matériau du segment et s'étendant de façon continue sur la face, paralllèlement à l'axe longitudinal du segment Les faces 22 de l'autre segment 20 sont planaires. En service, les deux segments sont sollicités mutuellement de manière à provoquer la déformation des formations en butée 25 contre les faces opposées 23 de l'autre segment afin qu'elles aient tendance à s'encastrer dans ces dernières On établit ainsi un contact continu entre les deux paires de surfaces opposées, ce qui contribue à assurer une exécution adéquate des soudures continues entre chaque paire de surfaces opposées grâce à l'application  cylindrical and comprising a pair of faces 22, 23 facing the opposite faces of the other segment A segment 21 comprises two faces 23, each of them being formed near their radial inner edge 24, with a small formation in deformable abutment 25 produced in one piece with the material of the segment and extending continuously on the face, parallel to the longitudinal axis of the segment The faces 22 of the other segment 20 are planar. In service, the two segments are biased mutually so as to cause the deformation of the abutment formations 25 against the opposite faces 23 of the other segment so that they tend to become embedded in them. This establishes a continuous contact between the two pairs of opposite surfaces, which contributes to ensuring an adequate execution of the continuous welds between each pair of opposite surfaces thanks to the application

ultérieure de l'énergie du faisceau laser.  energy of the laser beam.

Les segments de moule peuvent être réalisés à partir d'un alliage de métal à basse température de fusion, tel qu'un alliage plomb-étain- antimoine ou étain-bismuth, et sont susceptibles d'être récupérés après fusion en les retirant de l'article en matière plastique moulée Le procédé selon la présente invention n'est basé sur aucun matériau autre que le matériau des segments de noyau du moule pour assurer leur assemblage de manière à les utiliser comme moule et le matériau du noyau de moule peut donc être facilement recyclé sans nécessiter une séparation des matières étrangères, comme dans le cas ou l'on utiliserait, par exemple, une technique d'assemblage par collage ou par soudage pour assembler les  The mold segments can be produced from a metal alloy with a low melting temperature, such as a lead-tin-antimony or tin-bismuth alloy, and can be recovered after melting by removing them from the mold. molded plastic article The method according to the present invention is not based on any material other than the material of the core segments of the mold to ensure their assembly so as to use them as a mold and the material of the mold core can therefore be easily recycled without requiring a separation of foreign materials, as in the case where one would use, for example, an assembly technique by gluing or welding to assemble the

deux segments.two segments.

Lorsque l'invention est appliquée pour enlever des formations parasites sur un article en matière plastique, ledit article peut être pré- moulé en ménageant un creux au voisinage de la zone de l'article dans laquelle une bavure ou une formation parasite analogue aurait tendance à se former, de manière à utiliser l'énergie du faisceau laser pour provoquer la fusion de la formation parasite dans le creux et son accumulation à l'intérieur de ce dernier En variante, on peut utiliser l'énergie du faisceau laser pour enlever les  When the invention is applied to remove parasitic formations on a plastic article, said article can be pre-molded by creating a hollow in the vicinity of the zone of the article in which a burr or similar parasitic formation would tend to form, so as to use the energy of the laser beam to cause the parasitic formation to merge in the hollow and its accumulation inside the latter Alternatively, the energy of the laser beam can be used to remove the

bavures ou jointures par une opération de coupe.  burrs or joints by a cutting operation.

Claims (11)

REVENDICATIONS 1 Un procédé de fabrication d'un article en matière plastique moulée, caractérisé en ce qu'il comprend l'utilisation d'un moule à plusieurs segments ( 10,11; 20,21) en matériau fusible définissant, au moins en partie, une cavité ( 16) pour le moulage d'un matériau plastique dans lequel, avant le moulage du matériau plastique, les segments ( 10, 11; 20, 21) du moule sont disposés selon une orientation prédéterminée les uns par rapport aux autres, et les zones de bord ( 14, 15) des surfaces opposées ( 12,13; 22,23) des segments sont soumises à l'énergie d'un faisceau laser pour réunir les segments du moule, au moins dans ladite zone de bord, et enlever toutes formations parasites dans ladite zone  1 A method of manufacturing an article of molded plastic material, characterized in that it comprises the use of a mold with several segments (10,11; 20,21) of fusible material defining, at least in part, a cavity (16) for molding a plastic material in which, before the molding of the plastic material, the segments (10, 11; 20, 21) of the mold are arranged in a predetermined orientation with respect to each other, and the edge regions (14, 15) of the opposite surfaces (12,13; 22,23) of the segments are subjected to the energy of a laser beam to join the mold segments, at least in said edge region, and remove any parasitic formations in said area de bord.of edge. 2 Un procédé selon la revendication 1, caractérisé en ce qu'il est prévu dans, au moins l'une desdites zones de bord, une formation en nervure parasite ( 14) agencée pour servir de source de matériau de remplissage lorsqu'on la chauffe.  2 A method according to claim 1, characterized in that it is provided in, at least one of said edge areas, a parasitic rib formation (14) arranged to serve as a source of filling material when heated . 3 Un procédé selon la revendication 1 ou 2, carac-  3 A method according to claim 1 or 2, charac- térisé en ce qu'il est prévu une formation en butée déformable 525) sur, au moins, l'une desdites surfaces opposées ( 22, 23) adaptée, de préférence, pour se déformer lorsque lesdites surfaces opposées sont sollicitées l'une  terized in that a deformable abutment formation 525) is provided on, at least, one of said opposite surfaces (22, 23) adapted, preferably, to deform when said opposite surfaces are stressed one vers l'autre.towards the other. 4 Un procédé selon la revendication 3, caractérisé en ce qu'il comprend l'utilisation d'une formation en butée ( 25)  4 A method according to claim 3, characterized in that it comprises the use of a stop formation (25) longitudinalement continue.longitudinally continuous. Un procédé selon la revendication 3 ou 4, carac- térisé en ce qu'il comprend l'utilisation d'une formation en butée déformable ( 25) ménagée sur l'une desdites surfaces opposées ( 22, 23) sur ou près de l'une de ses zones  A method according to claim 3 or 4, characterized in that it comprises the use of a deformable abutment formation (25) formed on one of said opposite surfaces (22, 23) on or near the one of its zones de bord, soumise à ladite énergie du faisceau laser.  edge, subject to said laser beam energy. 6 Un procédé selon l'une quelconque des précédentes  6 A method according to any one of the preceding revendications, caractérisé en ce que l'énergie du faisceau  claims, characterized in that the beam energy laser est dirigée sur la surface du moule en plusieurs segments, dans une direction sensiblement perpendiculaire à la surface du moule, au voisinage d'une zone de bord  laser is directed onto the mold surface in several segments, in a direction substantially perpendicular to the mold surface, in the vicinity of an edge area localisée d'une surface opposée.located from an opposite surface. 7 Un procédé de fabrication d'un article en matière plastique moulée, caractérisé en ce qu'un article en matière plastique moulée est formé par une technique connue en soi, provoquant une formation parasite sur l'article, ledit article étant soumis alors à l'énergie d'un faisceau laser  7 A method of manufacturing a molded plastic article, characterized in that a molded plastic article is formed by a technique known per se, causing parasitic formation on the article, said article then being subjected to the energy of a laser beam dirigé sur la formation parasite.directed at parasitic formation. 8 Un procédé selon la revendication 7, caractérisé en ce qu'on utilise l'énergie du faisceau laser pour enlever la  8 A method according to claim 7, characterized in that the energy of the laser beam is used to remove the formation parasite par un effet de coupe.  parasitic formation by a cutting effect. 9 Un procédé selon la revendication 7 ou 8, carac-  9 A method according to claim 7 or 8, charac- térisé en ce qu'on utilise l'énergie du faisceau laser pour provoquer la fusion de la formation parasite et la mélanger  which uses the energy of the laser beam to cause the parasitic formation to merge and mix avec le matériau adjacent formant le corps de l'article.  with the adjacent material forming the body of the article. Un procédé selon l'une quelconque des reven-  A method according to any one of the res- dications 7 à 9, caractérisé en ce que l'énergie du faisceau laser est dirigée sur la surface de l'article en matière plastique dans une direction sensiblement perpendiculaire à la surface de l'article, au voisinage de la formation parasite. 11 Un procédé de fabrication d'un article par un procédé de moulage, caractérisé en ce que les formations parasites quelconques se produisant en cours de fabrication sont enlevées en les soumettant à l'énergie d'un faisceau laser.  dications 7 to 9, characterized in that the energy of the laser beam is directed on the surface of the plastic article in a direction substantially perpendicular to the surface of the article, in the vicinity of the parasitic formation. 11 A method of manufacturing an article by a molding process, characterized in that any parasitic formations occurring during manufacture are removed by subjecting them to the energy of a laser beam. 12 Une paire de segments de moule ( 10, 11) en matériau fusible, dotés de surfaces respectives ( 12, 13) en opposition l'une par rapport à l'autre après avoir été assemblées, de manière à définir, au moins en partie, un moule, caractérisés en ce que l'une desdites surfaces ( 13) est pourvue d'une zone de réception ( 15) dont un bord est exposé lorsque les surfaces en opposition sont en contact, l'autre surface ( 12) là étant pourvue, sur le bord exposé de façon similaire, d'une nervure de remplissage ( 14) de manière que l'énergie d'un rayon laser appliquée sur et au voisinage de la nervure de remplissage provoque l'écoulement du matériau parasite de la nervure de remplissage ( 14) dans la zone de réception ( 15) et 12 A pair of mold segments (10, 11) made of fusible material, having respective surfaces (12, 13) in opposition to each other after being assembled, so as to define, at least in part , a mold, characterized in that one of said surfaces (13) is provided with a receiving zone (15), one edge of which is exposed when the opposing surfaces are in contact, the other surface (12) there being provided, on the similarly exposed edge, with a filling rib (14) so that the energy of a laser beam applied to and in the vicinity of the filling rib causes the flow of parasitic material from the rib filling (14) in the receiving area (15) and la remplisse.fills it. 13 Une paire de segments de moule selon la reven-  13 A pair of mold segments according to the res- dication 12, caractérisée en ce que ladite zone de réception ( 15) comprend une rainure, une feuillure ou une formation  dication 12, characterized in that said receiving zone (15) comprises a groove, a rebate or a formation analogue.similar. 14 Une paire de segments de moule ( 20,21) en matériau fusible comportant des surfaces respectives ( 22, 23) en opposition l'une par rapport à l'autre après assemblage, de manière à définir, au moins en partie, un moule, caractérisée en ce qu'au moins l'une desdites surfaces ( 23) est pourvue d'une formation en butée déformable ( 25) agencée pour se déformer lorsque lesdites surfaces ( 22, 23) sont sollicitées  14 A pair of mold segments (20, 21) of fusible material having respective surfaces (22, 23) in opposition to each other after assembly, so as to define, at least in part, a mold , characterized in that at least one of said surfaces (23) is provided with a deformable abutment formation (25) arranged to deform when said surfaces (22, 23) are stressed l'une vers l'autre.towards each other. Une paire de segments de moule selon la revendication 14, caractérisée en ce que ladite formation en  A pair of mold segments according to claim 14, characterized in that said formation in butée déformable ( 25) est sensiblement continue longi-  deformable stop (25) is substantially continuous along tudinalement, de manière à former un joint sensiblement continu entre lesdites surfaces opposées ( 22, 23) lorsque  tudinally, so as to form a substantially continuous seal between said opposite surfaces (22, 23) when lesdites surfaces sont sollicitées l'une vers l'autre.  said surfaces are biased towards each other.
FR9212855A 1991-10-31 1992-10-28 MANUFACTURE OF PLASTIC ARTICLES. Granted FR2684916A1 (en)

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GB919123154A GB9123154D0 (en) 1991-10-31 1991-10-31 Manufacture of plastics articles

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FR2684916B1 FR2684916B1 (en) 1994-12-09

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009060795A1 (en) * 2009-12-31 2011-07-07 Liebherr-Werk Nenzing GmbH, Vorarlberg Pipe element with a cutting edge for welding to a support element
US8770231B2 (en) 2009-12-31 2014-07-08 Liebherr-Werk Nenzing Gmbh Pipe element with a trimmed edge for welding onto a carrier

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GB2260933B (en) 1996-07-03
BE1006261A5 (en) 1994-07-05
DE4236558A1 (en) 1993-05-06
GB9222177D0 (en) 1992-12-02
JPH05237845A (en) 1993-09-17
GB9123154D0 (en) 1991-12-18
GB2260933A (en) 1993-05-05
FR2684916B1 (en) 1994-12-09

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