FR2702990A1 - Method of decorating a thermoplastic support by low-pressure overmoulding, decoration and products obtained according to this method - Google Patents
Method of decorating a thermoplastic support by low-pressure overmoulding, decoration and products obtained according to this method Download PDFInfo
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- FR2702990A1 FR2702990A1 FR9303290A FR9303290A FR2702990A1 FR 2702990 A1 FR2702990 A1 FR 2702990A1 FR 9303290 A FR9303290 A FR 9303290A FR 9303290 A FR9303290 A FR 9303290A FR 2702990 A1 FR2702990 A1 FR 2702990A1
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Classifications
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C45/14196—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being positioned around an edge of the injected part
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C45/14196—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being positioned around an edge of the injected part
- B29C2045/14204—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being positioned around an edge of the injected part the edges formed by an intermediate mould part
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C2045/14303—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure progressively transferring the insert from one mould wall to the other mould wall of the mould cavity
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14967—Injecting through an opening of the insert
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14983—Bursting or breakthrough of the insert by the injection pressure
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
La présente invention a pour objet un procédé de recouvrement d'un support thermoplastique par un décor en matière textile: moquette, cuir, film etc., destiné en particulier, mais non exclusivement, à en améliorer la présentation et/ou le contact.The subject of the present invention is a method of covering a thermoplastic support with a textile decoration: carpet, leather, film, etc., intended in particular, but not exclusively, to improve the presentation and / or the contact.
Actuellement, la pose de tels décors est généralement mise en oeuvre par une technique connue sous le nom de thermogainage. Dans ce procédé, on injecte dans un premier temps la pièce à recouvrir, puis on réalise en reprise différentes opérations telles que le perçage de trous d'aspiration. On encolle la pièce puis on applique une couche textile sur la surface de celle-ci. On presse ensuite l'ensemble dans une contreforme avec aspiration du textile et on ouvre le moule après polymérisation de la colle. La pièce est ensuite finie par détourage des excédents textiles puis par rembordement. Ce procédé s'applique généralement sur des matériaux à base polystyrénique. Sur des bases polypropylèniques, le processus est plus complexe et il est nécessaire de procéder au préalable à un flammage des pièces ainsi qu'à la pose d'un primaire d'adhérence avant l'opération d'encollage.Currently, the installation of such decorations is generally carried out by a technique known under the name of thermogainage. In this process, the part to be covered is first injected, then various operations such as drilling suction holes are carried out in recovery. The part is glued and then a textile layer is applied to the surface thereof. The assembly is then pressed in a counterform with suction of the textile and the mold is opened after polymerization of the adhesive. The piece is then finished by trimming the textile surpluses and then by twisting. This process is generally applied on polystyrene-based materials. On polypropylene bases, the process is more complex and it is necessary to flame the parts beforehand as well as to apply an adhesion primer before the gluing operation.
Ce procédé, par le nombre des opérations nécessaires, est long et coûteux, il nécessite des moyens importants et ne permet la diffusion de produits décorés qu'en séries limitées c'est à dire des produits de luxe de haut de gamme.This process, by the number of operations required, is long and expensive, it requires significant resources and only allows the distribution of decorated products in limited series, that is to say high-end luxury products.
La présente invention a pour objet de pallier cet inconvénient et de permettre le décor par surmoulage de pièces en matières plastiques à moindre coût.The object of the present invention is to overcome this drawback and to allow decoration by overmolding plastic parts at a lower cost.
Il a déjà été proposé de réaliser une injection de matière plastique sur textile par différents procédés liés à une pression d'injection élevée ne permettant pas d'utiliser tous les décors sans détérioration plus ou moins prononcée de ceux-ci.It has already been proposed to carry out an injection of plastic material on textile by various processes linked to a high injection pressure which does not allow all the decorations to be used without more or less pronounced deterioration thereof.
Selon l'invention, le procédé de décoration de pièces en matière
thermoplastique qui consiste à:
- introduire un décor dans une cavité du moule,
- injecter la matière sous pression dans le moule par une ou plusieurs
buses;
se caractérise en ce qu'il comprend les étapes suivantes:
- injection de la matière thermoplastique à l'état fondu à basse pression
dans le moule, sous le décor, par une ou plusieurs buses;
injection simultanée d'un gaz inerte à basse pression, au moyen de
buses travaillant séquentiellement, pour guider la matière fondue selon
une orientation bien définie en fonction du décor;
- démoulage de la pièce recouverte d'un décor après refroidissement..According to the invention, the method of decorating pieces of material
thermoplastic which consists of:
- introduce a decoration into a mold cavity,
- inject the material under pressure into the mold by one or more
nozzles;
is characterized in that it comprises the following stages:
- injection of the thermoplastic material in the molten state at low pressure
in the mold, under the decoration, by one or more nozzles;
simultaneous injection of an inert gas at low pressure, by means of
nozzles working sequentially, to guide the molten material according to
a well-defined orientation according to the decor;
- release of the part covered with a decoration after cooling.
Le procédé consiste à injecter la matière à l'état fondu, sous faible pression, entre la paroi du moule et l'envers du décor à travers les veines plastiques chaudes, la matière étant poussée à l'intérieur du moule par un gaz inerte au moyen de buses travaillant séquentiellement pour répartir la matière sous le décor, sans le détériorer.The method consists in injecting the material in the molten state, under low pressure, between the wall of the mold and the back of the decoration through the hot plastic veins, the material being pushed inside the mold by an inert gas at means of nozzles working sequentially to distribute the material under the decoration, without damaging it.
Le principe de l'invention consiste à insuffler un gaz inerte tel que de l'azote, à travers des buses statiques et froides; quelques secondes après le début de l'injection de la matière thermoplastique, la première buse de gaz se met en action et laisse passer le gaz qui pousse le flot de matière jusqu'à la seconde buse de gaz qui à son tour pousse la matière jusqu'à la troisième buse etc. Plusieurs buses d'injection de gaz peuvent ainsi, en fonction d'un programme préétabli, orienter la matière ce qui permet d'éviter les distorsions d'aspect ou les détériorations du décor.The principle of the invention consists in injecting an inert gas such as nitrogen, through static and cold nozzles; a few seconds after the start of the injection of the thermoplastic material, the first gas nozzle activates and lets pass the gas which pushes the flow of material to the second gas nozzle which in turn pushes the material up 'at the third nozzle etc. Several gas injection nozzles can thus, depending on a pre-established program, orient the material, which avoids distortions in appearance or deterioration of the decor.
L'avantage essentiel du procédé ci-dessus résulte de ce que le décor, qui dans certaines applications, peut être relativement peu épais, ne subisse pas de choc brutal qui pourrait l'endommager; la matière est appliquée, sur le décor, d'une manière progressive et maîtrisée. L'injection sous basse pression ( 30 à 40 bars) avec des moules spécialement adaptés est également plus avantageuse que l'injection sous pression traditionnelle nécessitant des pressions de l'ordre de 180 à 300 bars, dans la mesure où elle permet l'emploi de machines standard utilisées en basse pression avec l'assistance d'un moyen périphérique. Ce procédé peut être mis en oeuvre pour l'injection de matières thermoplastiques telles que le polystyrène ou le polypropylène ou tout autre polymère, sans avoir à concevoir des machines spéciales uniquement dédiées à cette application.The essential advantage of the above process results from the fact that the decoration, which in certain applications, can be relatively thin, does not undergo sudden impact which could damage it; the material is applied, on the decor, in a progressive and controlled manner. Injection under low pressure (30 to 40 bars) with specially adapted molds is also more advantageous than injection under traditional pressure requiring pressures of the order of 180 to 300 bars, insofar as it allows the use of standard machines used in low pressure with the assistance of a peripheral means. This process can be implemented for the injection of thermoplastic materials such as polystyrene or polypropylene or any other polymer, without having to design special machines solely dedicated to this application.
D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre; des modes particuliers de réalisation, sont donnés uniquement à titre d'exemples non limitatifs, en regard des schémas qui représentent: - les figures la à I c, des schémas montrant les étapes du procédé selon
l'invention; - la figure 2, le schéma d'un moule pour la mise en oeuvre du procédé: - la figure 3, le schéma d'une buse froide d'injection de gaz; - la figure 4, le schéma d'un rembordement dans le moule; - la figure 5, le schéma d'un rembordement conjugué avec une coupe du
décor dans le moule; -- la figure 6, le surmoulage d'une pièce dont les extrémités sont rembordées; - les figures 7, 8 et 9, des exemples de décors pouvant être obtenus selon
l'invention.Other characteristics and advantages of the invention will appear during the description which follows; particular embodiments are given only by way of nonlimiting examples, with reference to the diagrams which represent: - Figures la to I c, diagrams showing the steps of the method according to
the invention; - Figure 2, the diagram of a mold for the implementation of the process: - Figure 3, the diagram of a cold gas injection nozzle; - Figure 4, the diagram of a fold in the mold; - Figure 5, the diagram of an overlap combined with a section of
decor in the mold; - Figure 6, the overmolding of a part whose ends are folded; - Figures 7, 8 and 9, examples of decorations obtainable according to
the invention.
Les figures la à 1 c représentent schématiquement les trois étapes du procédé. La matière thermoplastique est contenue dans une vis d'injection ( non référencée). Sur la figure la, on dispose le décor, ici une couche textile 5, dans le moule comprenant une matrice 1 et un poinçon 2. Pour des considérations techniques, le décor 5 est prédécoupé en morceaux ou posé à partir d'un rouleau et introduit dans le moule par un système robotisé. Sur la figure lb, on ferme le moule et on commence l'injection de la matière 6 avec ouverture séquentielle des buses qui orientent le flot thermoplastique. Sur la figure I c, on démoule le produit fini 5+6. Figures la to 1 c schematically represent the three stages of the process. The thermoplastic material is contained in an injection screw (not referenced). In FIG. 1 a, the decoration is placed, here a textile layer 5, in the mold comprising a die 1 and a punch 2. For technical considerations, the decoration 5 is precut into pieces or placed from a roller and introduced into the mold by a robotic system. In FIG. 1b, the mold is closed and the injection of the material 6 is started with sequential opening of the nozzles which orient the thermoplastic flow. In Figure I c, we unmold the finished product 5 + 6.
Deux techniques d'injection peuvent être utilisées:
Dans le premier cas; le coté matrice (1) du moule est fixé sur le plateau fixe de la presse et le poinçon (2) est fixé sur le plateau mobile. L'injection de matière thermoplastique est effectuée du coté matrice et la matière sous pression traverse la partie du décor au plan de joint, soit en dehors de la cavité, en face de la carotte d'injection. Cette carotte d'injection tunnel alimente la cavité sous le décor.Two injection techniques can be used:
In the first case; the die side (1) of the mold is fixed on the fixed plate of the press and the punch (2) is fixed on the movable plate. The injection of thermoplastic material is carried out on the matrix side and the pressurized material passes through the part of the decoration at the joint plane, ie outside the cavity, opposite the injection core. This tunnel injection core feeds the cavity under the decoration.
Dans le second cas, le coté matrice du moule est fixé sur le plateau mobile de la presse et le poinçon sur le plateau fixe. L'injection plastique arrive en partie arrière de la pièce à travers le poinçon directement sous le matériau de décor. In the second case, the die side of the mold is fixed on the movable plate of the press and the punch on the fixed plate. The plastic injection arrives at the rear of the part through the punch directly under the decor material.
D'une manière générale, l'injection est effectuée en un ou plusieurs points par des buses chaudes à obturateur. Les buses sont pilotées par une commande hydraulique ou pneumatique et, selon les besoins elles peuvent être pilotées simultanément ou alternativement.In general, the injection is carried out at one or more points by hot shutter nozzles. The nozzles are controlled by hydraulic or pneumatic control and, as required, they can be controlled simultaneously or alternately.
Dans les deux cas, le décor se trouve plaqué dans la matrice par la pression d'injection et prend ainsi la géométrie de la cavité qui définit la pièce.In both cases, the decoration is pressed into the matrix by the injection pressure and thus takes the geometry of the cavity which defines the part.
En utilisant l'une des deux techniques,une liaison parfaite est obtenue entre le décor et la pièce thermoplastique; la matière chaude à l'état fondu est plaquée uniformément sous la trame de protection du décor ou, directement au-dessous du décor lorsqu'une trame de protection n'est pas nécessaire (cuir, film etc.). Après polymérisation du polymère complètement refroidi, on obtient une bonne cohésion de la liaison entre les deux matériaux. Dans les deux cas précédents, l'injection séquentielle basse pression du gaz est rendue possible par l'insufflation d'un gaz froid inerte tel que de l'azote dans des veines chaudes de la pièce. Le gaz est insufflé séquentiellement en différents points et pousse ainsi la matière plastique en fusion d'un point à un autre dans une ou des directions judicieusement choisies. Using one of the two techniques, a perfect bond is obtained between the decoration and the thermoplastic part; the hot material in the molten state is uniformly pressed under the protective frame of the decor or, directly below the decor when a protective frame is not necessary (leather, film etc.). After polymerization of the completely cooled polymer, good cohesion of the bond between the two materials is obtained. In the two previous cases, the sequential low pressure gas injection is made possible by the blowing of an inert cold gas such as nitrogen into the hot veins of the part. The gas is blown sequentially at different points and thus pushes the molten plastic from one point to another in one or more judiciously chosen directions.
La figure 2 représente schématiquement un moule utilisant la première technique (technique tunnel). On distingue sur cette figure 2 la matrice 1 et le poinçon 2 délimitant la cavité du moule dans laquelle se fait l'injection de matière plastique. Conformément au procédé de l'invention, dans un premier temps le décor 5 est disposé dans le moule. La matière chaude, après fermeture du moule est introduite dans le bloc chauffant 3 intégré dans la matrice 1. L'injection se fait par une carotte d'injection 4 et,. sous l'action de la pression, la matière thermoplastique chemine dans le moule, a travers la carotte 4, dans l'exemple représenté sur la figure 2, et traverse le décor, même s'il s'agit de cuir. Bien entendu, il est possible de prévoir, en fonction des dimensions du moule un ensemble de carottes d'injection de la matière thermoplastique.La référence 7 désigne le front de la matière qui se déplace au fur et à mesure de l'injection en appliquant intimement le décor 5 contre la paroi de la matrice 1. La progression de la matière est, selon une caractéristique de l'invention pilotée par l'introduction d'un gaz neutre sous pression au moyen d'un ensemble de buses 10,11 ouvertes séquentiellement qui provoquent, dans la matière injectée une veine chaude 8 qui se transforme en une zone creuse 9 pressurisée par le gaz. Seules deux buses ont été représentées sur la figure 2, mais elles symbolisent un ensemble de buses de préférence régulièrement réparties et commandées par un automate (non représenté). Comme cela apparaît dans l'exemple de la figure 2, lors de l'injection, la matière 6 progresse de la droite vers la gauche de la figure et plaque le décor 5 contre la paroi du moule.FIG. 2 schematically represents a mold using the first technique (tunnel technique). We distinguish in this figure 2 the die 1 and the punch 2 delimiting the mold cavity in which the injection of plastic material takes place. According to the method of the invention, firstly the decoration 5 is placed in the mold. The hot material, after closing the mold, is introduced into the heating block 3 integrated in the matrix 1. The injection is made by an injection core 4 and ,. under the action of pressure, the thermoplastic material travels through the mold, through the core 4, in the example shown in FIG. 2, and passes through the decoration, even if it is leather. Of course, it is possible to provide, depending on the dimensions of the mold, a set of injection cores of the thermoplastic material. The reference 7 designates the front of the material which moves as the injection is carried out by applying intimately the decoration 5 against the wall of the matrix 1. The progression of the material is, according to a characteristic of the invention controlled by the introduction of a neutral gas under pressure by means of a set of open nozzles 10,11 sequentially which cause, in the injected material a hot vein 8 which transforms into a hollow zone 9 pressurized by the gas. Only two nozzles have been shown in FIG. 2, but they symbolize a set of nozzles preferably regularly distributed and controlled by an automaton (not shown). As it appears in the example of FIG. 2, during the injection, the material 6 progresses from right to left of the figure and presses the decoration 5 against the wall of the mold.
La figure 3 montre une buse froide ou injecteur de gaz 10. Le passage du gaz peut être réglé, par exemple, par un noyau cylindrique à plusieurs plats sur sa périphérie ou par un noyau en métal poreux. Le gaz insufflé forme la zone creuse pressurisée 9.Figure 3 shows a cold nozzle or gas injector 10. The gas flow can be regulated, for example, by a cylindrical core with several flats on its periphery or by a porous metal core. The blown gas forms the hollow pressurized zone 9.
Le procédé selon l'invention permet de résoudre le problème du rembordement, ou retour sur la tranche de la pièce, assurant le recouvrement des bords de la pièce plastique. The method according to the invention makes it possible to solve the problem of the twisting, or return on the edge of the part, ensuring the recovery of the edges of the plastic part.
Comme représenté sur la figure 4, le décor 5, quelle que soit son épaisseur est posé dans le moule et plaqué sur la tranche de la pièce par la pression de la matière injectée. L'excédent de textile est généralement découpé en reprise.As shown in Figure 4, the decor 5, whatever its thickness is placed in the mold and pressed on the edge of the part by the pressure of the injected material. The surplus of textile is generally cut in recovery.
Mais il est possible, dans certains cas, d'effectuer une prédécoupe de l'excédent de décor 5 directement dans le moule. A cet effet, le plan de joint doit être étudié pour que, lors de la fermeture du moule, le décor soit automatiquement découpé à la dimension voulue, sous l'effet de la pression de fermeture de la presse.However, it is possible, in certain cases, to pre-cut the excess decoration 5 directly in the mold. For this purpose, the parting line must be studied so that, when the mold is closed, the decoration is automatically cut to the desired size, under the effect of the press closing pressure.
Les figures 5 et 6 montrent une opération de rembordement avec découpe dans le moule. Le décor est pincé dans le plan de joint 13. La pression d'injection tend le décor 5 pendant le remplissage de la cavité par la matière thermoplastique et réalise le rembordement de la partie latérale 14; l'angle vif 15 favorise la coupe du décor par tension de celui-ci et par la pression du plastique. Dans l'exemple représenté, l'angle 15 est formé dans une pièce rapportée 16 à l'intérieur du moule.Figures 5 and 6 show a twist operation with cutting in the mold. The decoration is pinched in the joint plane 13. The injection pressure tightens the decoration 5 during the filling of the cavity with the thermoplastic material and realizes the folding of the lateral part 14; the sharp angle 15 favors the cutting of the decoration by tensioning it and by the pressure of the plastic. In the example shown, the angle 15 is formed in an insert 16 inside the mold.
L'excédent de textile ou autre décor dans la partie opposée de la pièce, sans rembordement du décor, est éliminé lors d'une opération ultérieure. L'éjection de la pièce terminée peut être obtenue par rotation de la pièce dans le moule. The excess of textile or other decoration in the opposite part of the room, without overlapping of the decoration, is eliminated during a subsequent operation. The ejection of the finished part can be obtained by rotating the part in the mold.
Il est bien entendu possible d'obtenir une découpe sur la périphérie de la pièce en adaptant le profil de la zone 14.It is of course possible to obtain a cutout on the periphery of the part by adapting the profile of the zone 14.
Comme il a été dit précédemment, la présente invention permet de recouvrir une pièce plastique avec des décors variés. Trois types de pièces décorées sont représentées en coupe sur les figures 7 à 9.As has been said previously, the present invention makes it possible to cover a plastic part with various decorations. Three types of decorated pieces are shown in section in Figures 7 to 9.
Sur la figure 7, le recouvrement vise à donner à la pièce un aspect textile. A cet effet, la pièce 6 est recouverte par une trame 17 de protection et de liaison elle-même surmontée par une couche textile 5. In FIG. 7, the covering aims to give the piece a textile appearance. To this end, the part 6 is covered by a protective and connection frame 17 itself topped by a textile layer 5.
Sur la figure 8, on désire que le décor présente au toucher un contact souple.In FIG. 8, it is desired that the decoration presents to the touch a flexible contact.
A cet effet, le décor comprend une couche extérieure textile 5, une couche de mousse 18, une trame 17 et la pièce plastique support 6. To this end, the decoration includes a textile outer layer 5, a foam layer 18, a weft 17 and the plastic support part 6.
Comme représenté sur la figure 9, le revêtement peut consister en une couche de cuir 19. L'injection directe du thermoplastique sur le cuir est possible du fait de la rugosité de celui-ci sur sa partie envers. L'utilisation du cuir dans la technique de surmoulage a l'avantage de permettre la reproduction sur la pièce finie en cuir d'un décor correspondant à la matrice.As shown in FIG. 9, the coating can consist of a layer of leather 19. Direct injection of the thermoplastic onto the leather is possible due to the roughness of the latter on its reverse side. The use of leather in the molding technique has the advantage of allowing the reproduction on the finished piece of leather of a decoration corresponding to the matrix.
La décor peut être réalisé dans la matrice du moule par grainage chimique, par gravure manuelle ou par tout autre technique. Il est imprimé dans le cuir par la pression du thermoplastique injecté.The decoration can be produced in the mold of the mold by chemical graining, by manual engraving or by any other technique. It is printed in leather by the pressure of the injected thermoplastic.
Il va de soi que de nombreuses variantes peuvent être apportées, notamment par substitution de moyens techniques équivalents, sans sortir pour cela du cadre de l'invention. It goes without saying that many variants can be made, in particular by substitution of equivalent technical means, without departing from the scope of the invention.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9303290A FR2702990B1 (en) | 1993-03-23 | 1993-03-23 | Process for decorating a thermoplastic support by low pressure overmolding, decor and products obtained according to this process. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9303290A FR2702990B1 (en) | 1993-03-23 | 1993-03-23 | Process for decorating a thermoplastic support by low pressure overmolding, decor and products obtained according to this process. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2702990A1 true FR2702990A1 (en) | 1994-09-30 |
| FR2702990B1 FR2702990B1 (en) | 1995-06-16 |
Family
ID=9445224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9303290A Expired - Fee Related FR2702990B1 (en) | 1993-03-23 | 1993-03-23 | Process for decorating a thermoplastic support by low pressure overmolding, decor and products obtained according to this process. |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2702990B1 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996003267A1 (en) * | 1994-07-21 | 1996-02-08 | Decoma International Inc. | Method and apparatus for manufacturing an injection-molded article with outer film secured thereto |
| EP0698465A1 (en) * | 1994-08-25 | 1996-02-28 | GEBR. HAPPICH GmbH | Construction element such as covering or trim element or the like as well as method for manufacturing such an element |
| WO1996033061A1 (en) * | 1995-04-20 | 1996-10-24 | United Technologies Automotive Systems, Inc. | Method and mold design for in-mold decoration of injection molded articles |
| WO1998039150A3 (en) * | 1997-03-07 | 1999-02-18 | Cascade Eng Inc | Gas-assisted injection molding of large panels with sequential gating |
| US6063315A (en) * | 1997-03-07 | 2000-05-16 | Cascade Engineering, Inc. | Gas-assisted injection molding of large panels with sequential gating |
| DE19827706C2 (en) * | 1997-07-11 | 2002-04-11 | Ford Motor Co | Method for attaching a cover material to an injection molded plastic part |
| FR2827805A1 (en) * | 2001-07-26 | 2003-01-31 | Plastiques Franc Des | Plastic component decorating procedure, uses motifs on continuous strip of film fed from roll, cut into sections and placed in injection mould |
| US7077174B2 (en) | 2001-09-26 | 2006-07-18 | Bae Systems Plc | Method of potting a component |
| WO2008060215A1 (en) * | 2006-11-14 | 2008-05-22 | International Automotive Components Group Ab | A process and a mold for the manufacturing of interior panels by injection molding |
| ES2315102A1 (en) * | 2006-05-31 | 2009-03-16 | Ricardo Abad Gonzalez | Procedure to build, in situ, sandwich-type parts with natural stone. (Machine-translation by Google Translate, not legally binding) |
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| FR2575961A1 (en) * | 1985-01-11 | 1986-07-18 | Hebert Fils Paul | Process for manufacturing an article made from a thermoplastic material with insertion into the latter of a film or the like, and device for its implementation |
| EP0320925A1 (en) * | 1987-12-15 | 1989-06-21 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Method for manufacturing plastic mouldings with a decoratively embossed surface coating |
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| EP0491682A1 (en) * | 1992-02-11 | 1992-06-24 | Neyr Plastiques (S.A.) | Method for the manufacture of moulded articles comprising a rigid support and a flexible coating |
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| FR2575961A1 (en) * | 1985-01-11 | 1986-07-18 | Hebert Fils Paul | Process for manufacturing an article made from a thermoplastic material with insertion into the latter of a film or the like, and device for its implementation |
| EP0320925A1 (en) * | 1987-12-15 | 1989-06-21 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Method for manufacturing plastic mouldings with a decoratively embossed surface coating |
| EP0322285A1 (en) * | 1987-12-15 | 1989-06-28 | Compagnie Plastic Omnium | Method for coating non-rigid foils by injection of thermoplastic materials for making composite parts |
| US4968474A (en) * | 1988-09-19 | 1990-11-06 | Toyoda Gosei Co., Ltd. | Method of producing resin molded article |
| DE4100538A1 (en) * | 1990-11-12 | 1992-05-14 | Wulf & Co Emsa Werk | Prodn. of flat plastic articles - by drawing decorative film across mould, cutting off outer rim, and injecting hot polymer shot to bond to and press film against tool face |
| EP0491682A1 (en) * | 1992-02-11 | 1992-06-24 | Neyr Plastiques (S.A.) | Method for the manufacture of moulded articles comprising a rigid support and a flexible coating |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996003267A1 (en) * | 1994-07-21 | 1996-02-08 | Decoma International Inc. | Method and apparatus for manufacturing an injection-molded article with outer film secured thereto |
| EP0698465A1 (en) * | 1994-08-25 | 1996-02-28 | GEBR. HAPPICH GmbH | Construction element such as covering or trim element or the like as well as method for manufacturing such an element |
| WO1996033061A1 (en) * | 1995-04-20 | 1996-10-24 | United Technologies Automotive Systems, Inc. | Method and mold design for in-mold decoration of injection molded articles |
| WO1998039150A3 (en) * | 1997-03-07 | 1999-02-18 | Cascade Eng Inc | Gas-assisted injection molding of large panels with sequential gating |
| US6063315A (en) * | 1997-03-07 | 2000-05-16 | Cascade Engineering, Inc. | Gas-assisted injection molding of large panels with sequential gating |
| US6227840B1 (en) | 1997-03-07 | 2001-05-08 | Cascade Engineering, Inc. | Apparatus for molding relatively large articles |
| US6245415B1 (en) | 1997-03-07 | 2001-06-12 | Cascade Engineering, Inc. | Structural article of relatively large dimensions |
| DE19827706C2 (en) * | 1997-07-11 | 2002-04-11 | Ford Motor Co | Method for attaching a cover material to an injection molded plastic part |
| FR2827805A1 (en) * | 2001-07-26 | 2003-01-31 | Plastiques Franc Des | Plastic component decorating procedure, uses motifs on continuous strip of film fed from roll, cut into sections and placed in injection mould |
| US7077174B2 (en) | 2001-09-26 | 2006-07-18 | Bae Systems Plc | Method of potting a component |
| ES2315102A1 (en) * | 2006-05-31 | 2009-03-16 | Ricardo Abad Gonzalez | Procedure to build, in situ, sandwich-type parts with natural stone. (Machine-translation by Google Translate, not legally binding) |
| WO2008060215A1 (en) * | 2006-11-14 | 2008-05-22 | International Automotive Components Group Ab | A process and a mold for the manufacturing of interior panels by injection molding |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2702990B1 (en) | 1995-06-16 |
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