FR2630518A1 - Improved component made of synthetic material applicable in the field of leakproofing and moulding - Google Patents

Improved component made of synthetic material applicable in the field of leakproofing and moulding Download PDF

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Publication number
FR2630518A1
FR2630518A1 FR8805520A FR8805520A FR2630518A1 FR 2630518 A1 FR2630518 A1 FR 2630518A1 FR 8805520 A FR8805520 A FR 8805520A FR 8805520 A FR8805520 A FR 8805520A FR 2630518 A1 FR2630518 A1 FR 2630518A1
Authority
FR
France
Prior art keywords
core
perforations
rod
sheath
synthetic material
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
FR8805520A
Other languages
French (fr)
Other versions
FR2630518B1 (en
Inventor
Jean-Claude Douchet
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.)
Nobel Plastiques SA
Original Assignee
Nobel Plastiques SA
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 Nobel Plastiques SA filed Critical Nobel Plastiques SA
Priority to FR8805520A priority Critical patent/FR2630518B1/en
Publication of FR2630518A1 publication Critical patent/FR2630518A1/en
Application granted granted Critical
Publication of FR2630518B1 publication Critical patent/FR2630518B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
    • F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
    • 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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/22—Component parts, details or accessories; Auxiliary operations
    • B29C39/26—Moulds or cores
    • B29C39/32—Moulds or cores with joints or the like for making the mould impervious

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

This component is in the form of a reed consisting essentially of a core 1 made of synthetic material covered with a fine film 2 of another synthetic material which is not chemically compatible with that of which this core is made and comprising on its periphery perforations, notches or lips 3 exposing the said core at the locations of these perforations, notches or lips.

Description

La presente invention concerne un élément ameliore en matière synthétique applicable dans le domaine de l'étanchéité et du moulage. The present invention relates to an improved synthetic material element applicable in the field of sealing and molding.

L'élément selon l'invention est tout parti culièrement destiné au domaine de la fabrication des plaques ou feuilles dites de verre synthétique. De telles plaques ou feuilles sont généralement â base d'un polymére acrylique comme, notamment, le polyméthacrylate de methyle. Elle sont, dans la plupart des cas, fabriquees industriellement selon une technique de coulagemoulage qui consiste å couler le composé acrylique entre deux plaques de verre qui servent de moule. Pour garantir l'étanchéité sur le pourtour de ces plaques de verre, on utilise un joint, de préférence également en matière polymère thermoplastique.Ce joint, suivant sa forme et sa dimension, assure simultanément 1 etancheite et le maintien de l'écartement précis recherché entre les deux plaques de verre. The element according to the invention is particularly intended for the field of manufacturing plates or sheets called synthetic glass. Such plates or sheets are generally based on an acrylic polymer such as, in particular, polymethyl methacrylate. They are, in most cases, manufactured industrially using a casting-molding technique which consists in casting the acrylic compound between two glass plates which serve as molds. To guarantee sealing around the periphery of these glass plates, a seal is used, preferably also made of thermoplastic polymer material. This seal, depending on its shape and size, simultaneously provides 1 seal and the desired precise spacing is maintained. between the two glass plates.

Une fois le moulage a chaud réalisé et le refroidissement de l'ensemble obtenu, on procède au démoulage. c'est-à-dire qu on dégage les deux plaques de verre qui n'adhèrent aucunement au joint dont il est question ci-dessus. Du fait que ce dernier fait entièrement corps avec tout le pourtour de la plaque ou de la feuille. on procède généralement à un découpage de manière à se débarrasser de ce qui subsiste de la matière constitutive du joint qui s'est intimement combinée, par compatibilité chimique, à la matière constitutive de ladite plaque ou feuille. Once the hot molding has been carried out and the assembly obtained has cooled, the mold is removed. that is to say that one releases the two glass plates which do not adhere in any way to the gasket referred to above. Because the latter is completely integral with the entire periphery of the plate or sheet. cutting is generally carried out so as to get rid of what remains of the material constituting the seal which has intimately combined, by chemical compatibility, with the material constituting said plate or sheet.

On comprendra aisément qu'il en résulte des chutes et, partant. une perte non négligeable de matières, ce qui est au détriment du bilan économique de l'opération.  It is easy to understand that this results in falls and, therefore. a significant loss of materials, which is to the detriment of the economic balance of the operation.

La presente invention se propose d'obvier à
cet inconvénient et vise un joint amélioré utilisé de la
mëme manière que celle qui vient d autre décrite dans le
cas particulier de la réalisation de plaques en matière
synthétique mais ne nécessitant pas le découpage des
zones lisières où sont entremëlées ou combinées la
matière constitutive du joint et celle de la plaque.The present invention proposes to obviate
this drawback and is aimed at an improved seal used from the
same way as that which comes from other described in the
special case of making plates of material
synthetic but not requiring the cutting of
edge areas where are interspersed or combined the
constituent material of the seal and that of the plate.

La présente invention se propose alors d'uti
liser comme matière constitutive du joint, toute matière
actuellement employée à cet effet comme, par exemple,
une matière synthétique thermofusible ou thermoplastique
du type polychlorure de vinyle plastifiée ou non mais
réalisée de façon telle qu'au démoulage, ce joint
n'adhère pratiquement plus å la plaque ou la feuille
finale, après moulage et refroidissement.The present invention therefore proposes to use
read as the constituent material of the joint, any material
currently used for this purpose such as, for example,
a hot-melt or thermoplastic synthetic material
of the polyvinyl chloride type, plasticized or not, but
produced in such a way that when the mold is removed, this joint
practically no longer adheres to the plate or sheet
final, after molding and cooling.

Ainsi, la présente invention fournit un tel
joint se caractérisant par le fait qu'il se présente
sous la forme d'un jonc essentiellement constitué d'une
ame en matière synthétique recouverte d'une fine pelli
cule d'une autre matière synthétique non chimiquement
compatible avec celle constitutive de cette àme et com
portant sur sa périphérie des perforations, entailles ou
levures mettant à nu ladite äme aux endroits de ces
perforations, entailles ou lèvres.Thus, the present invention provides such
seal characterized by the fact that it presents itself
in the form of a rod essentially consisting of a
plastic core covered with a fine pelli
from another non-chemically synthetic material
compatible with that constituting this soul and com
with perforations, notches or
yeasts exposing said soul at the places of these
perforations, cuts or lips.

Suivant d'autres caractéristiques
- en fonction de la destination du jonc selon
1 invention, en particulier dans une opération de cou
lage-moulage d'une plaque en matière synthétique, la
matière constitutive de l'âme du jonc est choisie pour hêtre chimiquement compatible avec celle de la matière à
couler ou à mouler
- les perforations, entailles ou levures sont
régulièrejnent réparties sur toute la périphérie de la
gaine entourant l'âme du jonc
- la gaine comportant ces perforations, en
tailles ou levures épouse étroitement le pourtour de
l'âme de ce jonc
- ledit jonc présente une section circulaire, carree, rectangulaire ou toute autre section polygonale;
- la nature du matériau constitutif de la gaine, est à base d'un polymère thermoplastique choisi, par exemple, parmi les polyoléfines, les polyesters et son épaisseur est de l'ordre du dixième de millimètre
- la nature du matériau constitutif de ladite gaine peut être à base d'un polymère thermodurcissable.According to other characteristics
- depending on the destination of the rod according to
1 invention, in particular in a neck operation
lage-molding of a plastic plate, the
constituent material of the core of the rod is chosen to be beech chemically compatible with that of the material to
cast or mold
- perforations, cuts or yeasts are
regularly distributed over the entire periphery of the
sheath surrounding the core of the rod
- the sheath comprising these perforations, in
sizes or yeasts closely follow the perimeter of
the soul of this rush
- Said rod has a circular, square, rectangular or any other polygonal section;
the nature of the material constituting the sheath is based on a thermoplastic polymer chosen, for example, from polyolefins, polyesters and its thickness is of the order of a tenth of a millimeter
- The nature of the material of said sheath may be based on a thermosetting polymer.

D'autres caractéristiques et les avantages de l'invention ressortiront plus clairement de la description qui va suivre, faite en regard des dessins annexes sur lesquels
- la figure 1 est une vue en perspective d'une portion de jonc conforme à l'invention présentant des perforations de forme circulaire
- la figure 2 est une vue analogue à la figure 1, lesdites perforations étant de forme oblongue.Other characteristics and advantages of the invention will emerge more clearly from the description which follows, made with reference to the annexed drawings in which
- Figure 1 is a perspective view of a portion of the rod according to the invention having perforations of circular shape
- Figure 2 is a view similar to Figure 1, said perforations being oblong.

En se référant à ces figures, on a représenté sur la figure 1 une forme de réalisation possible d'un jonc selon l'invention. On a désigné par la référence 1 l'âme de ce jonc et par la référence 2, la gaine qui l'entoure. Des perforations 3 de forme circulaire sont réalisées par tout moyen approprié à la périphérie de cette gaine 2. Referring to these figures, there is shown in Figure 1 a possible embodiment of a rod according to the invention. We have designated by the reference 1 the core of this rod and by the reference 2, the sheath which surrounds it. Perforations 3 of circular shape are produced by any suitable means at the periphery of this sheath 2.

La figure 2 représente le même jonc, les réfé- rences 1, 2 et 3 ayant la même signification que celle donnée pour la figure 1, à l'exception du fait que les perforations 3 sont dans ce cas de forme oblongue. FIG. 2 represents the same rod, the references 1, 2 and 3 having the same meaning as that given for FIG. 1, except for the fact that the perforations 3 are in this case of oblong shape.

Bien entendu, ces perforations 3 pourront avoir toute autre. forme désirée.Of course, these perforations 3 may have any other. desired shape.

Le jonc selon l'invention peut être obtenu par tout procédé actuellement connu. The rod according to the invention can be obtained by any currently known process.

On notera toutefois qu'un procédé avantageux pour réaliser un tel jonc selon l'invention consiste à co-extruder l'âme 1 en mëme temps que sa gaine 2.  It will however be noted that an advantageous method for producing such a rod according to the invention consists in co-extruding the core 1 at the same time as its sheath 2.

Quant aux perforations, entailles ou levures 3, celles-ci peuvent être obtenues par tout moyen approprié au moment de la co-extrusion ou à la sortie de l'extru- deuse. Ces perforations, entailles ou levures sont réalisées au moyen d'outils tels que : aiguilles, perceuses, poinçons, fraises ou meules et analogues, ou tout autre moyen permettant d'arriver au résultat. As for the perforations, notches or yeasts 3, these can be obtained by any suitable means at the time of co-extrusion or at the outlet of the extruder. These perforations, cuts or yeasts are produced using tools such as: needles, drills, punches, cutters or grindstones and the like, or any other means enabling the result to be obtained.

La matière constitutive de l'âme 1 sera avantageusement choisie parmi les matières chimiquement compatibles avec la matière constitutive de la plaque ou de la feuille finalement désirée et la matière constitutive de la gaine 2 sera avantageusement choisie parmi les matières non chimiquement compatibles avec les deux précédentes. C'est ainsi que si la plaque ou la feuille à réaliser est en un polymère acrylique, la matière constitutive de l'âme du jonc 1 pourra être choisie parmi les chlorures de polyvinyle -plastifiés ou non alors que la matière constitutive de la gaine 2 pourra être choisie parmi les oléfines, polyesters et analogues. The constituent material of the core 1 will advantageously be chosen from among the materials chemically compatible with the constituent material of the plate or sheet finally desired and the constituent material of the sheath 2 will advantageously be chosen from among the materials not chemically compatible with the previous two . Thus, if the plate or sheet to be produced is made of an acrylic polymer, the material constituting the core of the rod 1 may be chosen from polyvinyl chlorides - plasticized or not, while the material constituting the sheath 2 may be chosen from olefins, polyesters and the like.

L'épaisseur de cette gaine sera très fine et avantageusement de l'ordre du dixième de millimètre.The thickness of this sheath will be very thin and advantageously of the order of a tenth of a millimeter.

On se sert du jonc selon 1 invention de la manière habituelle pour réaliser l'étanchéité dans l'opération de moulage d'un monomère entre deux plaques chimiquement et thermiquement inertes. On procède à cette opération de coulage-moulage comme à l'habitude et, au terme de celle-ci, on'retire les plaques chimiquement et thermiquement inertes. The rod according to the invention is used in the usual way for sealing in the molding operation of a monomer between two chemically and thermally inert plates. This casting-molding operation is carried out as usual and, at the end of this, the chemically and thermally inert plates are removed.

La feuille ou plaque moulée résultante se pr~- sente alors avec, sur sa tranche et sur toute sa périphérie, le jonc qui n'adhère à cette tranche qu'aux seuls endroits ou la gaine 2 comporte les perforations 3 qui se trouvaient au contact de cette tranche. L'opération thermique a eu pour effet de solidariser par fusionnement la matière constitutive de l'âme dudit jonc avec celle constitutive de la plaque désirée.  The resulting sheet or molded plate is then ~ - felt with, on its edge and over its entire periphery, the rod which only adheres to this edge in the only places where the sheath 2 has the perforations 3 which were in contact of this slice. The thermal operation had the effect of joining by fusion the material constituting the core of said rod with that constituting the desired plate.

Celle-ci n'adhère ainsi à cette plaque que de place en place et par points.It thus adheres to this plate only from place to place and by points.

Ce mode de retenue du jonc selon l'invention est du au fait que la gaine 2 n'étant pas -chimiquement compatible avec la matière constitutive du produit à obtenir, elle n'a pas été affectée par l'opération thermique lors du moulage à chaud, alors que la matière constitutive.de l'âme du jonc l'a été.This method of retaining the rod according to the invention is due to the fact that the sheath 2 not being chemically compatible with the material of the product to be obtained, it was not affected by the thermal operation during molding at hot, while the constituent material of the core of the rod was.

Le contact et l'interpénètration, la fusion ou la combinaison chimique n'ont pu donc se faire entre les deux matériaux chimiquement compatibles qu'aux endroits où ceux-ci étaient susceptibles de fusionner, c'est-à- dire au travers des perforations réalisées sur la gaine 2. Contact and interpenetration, fusion or chemical combination could therefore only be made between the two chemically compatible materials in places where they were likely to merge, that is to say through perforations made on the sheath 2.

La plaque ou la feuille finale obtenue est facilement débarrassée du joint qui l'entoure sur sa tranche en tirant sur le joint qui s'en détache aisément, comme on le comprendra. Il subsiste peut-ëtre quelques aspérités sur cette tranche qu'il est facile d'éliminer par ébarbage ou par grattage, limage ou autre opération appropriée. The final plate or sheet obtained is easily rid of the seal which surrounds it on its edge by pulling on the seal which is easily detached therefrom, as will be understood. There may still be some roughness on this slice which can be easily removed by deburring or by scraping, filing or other suitable operation.

La gaine selon l'invention présente ainsi un intérêt certain du point de vue économique évitant des pertes importantes en matières premières. The sheath according to the invention thus presents a certain advantage from the economic point of view avoiding significant losses in raw materials.

Il va de soi que la présente invention n'a été décrite qu'à titre purement explicatif et nullement limitatif et que toute modification, notamment au niveau des équivalences techniques, pourra y être apportée sans sortir de son cadre.  It goes without saying that the present invention has been described for purely explanatory and in no way limitative and that any modification, in particular in terms of technical equivalences, may be made without departing from its scope.

Claims (7)

REVENDICATIONS 1. Elément amélioré en matière synthétique applicable dans le domaine de l'étanchéité et du moulage, caractérisé en ce qu'il se présente sous la forme d'un jonc essentiellement constitué d'une âme (1) en matière synthétique recouverte d'une fine pellicule (2) d'une autre matière synthétique non chimiquement compatibl avec celle constitutive de cette äme et comportant sur sa périphérie des perforations, entailles ou mièvres(3) mettant à nu ladite ame aux endroits de ces perforations, entailles ou levures.  1. Improved element made of synthetic material applicable in the field of sealing and molding, characterized in that it is in the form of a rod essentially consisting of a core (1) of synthetic material covered with a thin film (2) of another synthetic material which is not chemically compatible with that constituting this core and comprising on its periphery perforations, cuts or cutthroat (3) exposing said core at the locations of these perforations, cuts or yeasts. 2. Elément selon la revendication 1, caractérisé en ce qu'en fonction des gaines, en particulier dans une opération de coulage-moulage d'une plaque en matière synthétique, la matière constitutive de ladite âme de jonc est choisie pour être chimiquement compatible avec celle de la matière à couler ou à mouler. 2. Element according to claim 1, characterized in that as a function of the sheaths, in particular in a casting-molding operation of a plate of synthetic material, the material constituting said rod core is chosen to be chemically compatible with that of the material to be cast or molded. 3. Elément selon la revendication 1 ou 2, caractérisé en ce que les perforations, entailles ou levures (3) sont régulièrement réparties sur toute la périphérie de la gaine entourant l'âme du jonc. 3. Element according to claim 1 or 2, characterized in that the perforations, notches or yeasts (3) are regularly distributed over the entire periphery of the sheath surrounding the core of the rod. 4. Elément selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la gaine (2) comportant ces perforations, entailles ou lèvres (3) épouse étroitement le pourtour de l'âme de ce jonc. 4. Element according to any one of claims 1 to 3, characterized in that the sheath (2) comprising these perforations, notches or lips (3) closely follows the periphery of the core of this rod. 5. Elément selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ledit jonc présente une section circulaire, carrée, rectangulaire ou toute autre section polygonale. 5. Element according to any one of claims 1 to 4, characterized in that said rod has a circular, square, rectangular section or any other polygonal section. 6. Element selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la nature du matériau constitutif de la gaine est à base d'unpolymére thermoplastique et que son épaisseur est de l'ordre du dixième de millimètre,  6. Element according to any one of claims 1 to 5, characterized in that the nature of the material constituting the sheath is based on a thermoplastic polymer and that its thickness is of the order of tenths of a millimeter, 7. Elément selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la nature du matériau constitutif de ladite gaine (2).peut être à base d'un polymère thermodurcissable.  7. Element according to any one of claims 1 to 6, characterized in that the nature of the material constituting said sheath (2). Can be based on a thermosetting polymer.
FR8805520A 1988-04-26 1988-04-26 IMPROVED ELEMENT IN SYNTHETIC MATERIAL APPLICABLE IN THE FIELD OF SEALING AND MOLDING Expired - Fee Related FR2630518B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8805520A FR2630518B1 (en) 1988-04-26 1988-04-26 IMPROVED ELEMENT IN SYNTHETIC MATERIAL APPLICABLE IN THE FIELD OF SEALING AND MOLDING

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8805520A FR2630518B1 (en) 1988-04-26 1988-04-26 IMPROVED ELEMENT IN SYNTHETIC MATERIAL APPLICABLE IN THE FIELD OF SEALING AND MOLDING

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FR2630518A1 true FR2630518A1 (en) 1989-10-27
FR2630518B1 FR2630518B1 (en) 1990-08-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1450364A1 (en) * 1964-03-10 1970-01-02 Minnesota Rubber Co Composite sealing ring and process for its manufacture
FR2141083A5 (en) * 1971-06-07 1973-01-19 Svenska Flaektfabriken Ab
GB2116266A (en) * 1982-03-11 1983-09-21 Leeser Gummi & Kunststoff Rubber sealing member
EP0151818A1 (en) * 1984-02-13 1985-08-21 Exploitatiemaatschappij Delta Glas B.V. Method for manufacturing acrylate plates
DE3623008A1 (en) * 1985-11-06 1987-05-07 Josef Nemetz Sealing ring

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1450364A1 (en) * 1964-03-10 1970-01-02 Minnesota Rubber Co Composite sealing ring and process for its manufacture
FR2141083A5 (en) * 1971-06-07 1973-01-19 Svenska Flaektfabriken Ab
GB2116266A (en) * 1982-03-11 1983-09-21 Leeser Gummi & Kunststoff Rubber sealing member
EP0151818A1 (en) * 1984-02-13 1985-08-21 Exploitatiemaatschappij Delta Glas B.V. Method for manufacturing acrylate plates
DE3623008A1 (en) * 1985-11-06 1987-05-07 Josef Nemetz Sealing ring

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