FR2724130A1 - Plastic parts having over-moulded coating complex - Google Patents
Plastic parts having over-moulded coating complex Download PDFInfo
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- FR2724130A1 FR2724130A1 FR9410702A FR9410702A FR2724130A1 FR 2724130 A1 FR2724130 A1 FR 2724130A1 FR 9410702 A FR9410702 A FR 9410702A FR 9410702 A FR9410702 A FR 9410702A FR 2724130 A1 FR2724130 A1 FR 2724130A1
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- foam
- coating
- mold
- plastic material
- fixed
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/20—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. moulding inserts or for coating articles
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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
- B29C45/14778—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 article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14795—Porous or permeable material, e.g. foam
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/78—Moulding material on one side only of the preformed part
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/001—Shaping in several steps
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/08—Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder
-
- 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
-
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/08—Surface shaping of articles, e.g. embossing; Apparatus therefor by flame treatment ; using hot gases
-
- 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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
-
- 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
- B29L2009/00—Layered products
-
- 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
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
-
- 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
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
- B29L2031/3041—Trim panels
Abstract
Description
La présente invention concerne un procédé de réalisation de pièces en matière plastique comportant un revêtement surmoulé. The present invention relates to a process for producing plastic parts comprising an overmolded coating.
I1 est connu de réaliser de telles pièces en surmoulant des complexes constitués par une plaque de mousse, munie sur son envers d'un matériau protecteur et sur son endroit d'un revêtement décoratif tel qu'un tissu. I1 is known to produce such parts by overmolding complexes consisting of a foam plate, provided on its reverse side with a protective material and on its face with a decorative covering such as a fabric.
Selon cette technique connue, le complexe est placé dans un moule prévu à cet effet, l'envers de la plaque de mousse étant situé du côté des buses d'injection du moule, et une matière plastique est injectée dans le moule. Le matériau protecteur empéche alors la matière plastique d'atteindre le revêtement, ce qui pourrait l'endommager. According to this known technique, the complex is placed in a mold provided for this purpose, the back of the foam plate being located on the side of the injection nozzles of the mold, and a plastic material is injected into the mold. The protective material then prevents the plastic from reaching the coating, which could damage it.
On obtient ainsi des pièces en matière plastique qui présentent, du côté du complexe, une surface esthétique et agréable au touché, du fait du moelleux conféré par la présence de la mousse sous le revêtement. Plastic parts are thus obtained which, on the complex side, have an aesthetic surface which is pleasant to the touch, due to the softness imparted by the presence of the foam under the coating.
Cette technique connue présente cependant des inconvénients. This known technique has drawbacks, however.
En effet, lorsque l'on tente de surmouler une pièce qui comporte des reliefs marqués, on constate que le revêtement présente des zones dans lesquelles il est endommagé ou, pour le moins, fragilisé. Indeed, when an attempt is made to overmold a part which has marked reliefs, it is found that the coating has areas in which it is damaged or, at the very least, weakened.
Par exemple, le revêtement peut se plisser dans les angles ou subir des déchirures ou des tensions favorisant son usure dans les reliefs. For example, the coating can wrinkle in the corners or undergo tears or tensions favoring its wear in the reliefs.
Les velours, en particulier, peuvent présenter un aspect moiré qui est dû à la trop forte pression exercée par la matière plastique lors du surmoulage. Velvets, in particular, can have a moire appearance which is due to the excessive pressure exerted by the plastic during overmolding.
Pour limiter les risques de détériorations du revêtement, on choisit généralement des matières plastiques très fluides qui peuvent être injectées à basse pression, par exemple de l'ordre de 5 à 10 MPa (50 à 100 bars). To limit the risk of damage to the coating, generally very fluid plastics are chosen which can be injected at low pressure, for example of the order of 5 to 10 MPa (50 to 100 bars).
Mais cette fluidité importante de la matière plastique peut provoquer des infiltrations dans la mousse, si la qualité du matériau de protection placé sur l'envers de la mousse est insuffisante. However, this high fluidity of the plastic material can cause infiltration into the foam, if the quality of the protective material placed on the back of the foam is insufficient.
Par ailleurs, on cherche à éviter le pincement du revêtement à sa périphérie en utilisant un moule à plan de joint positif. Furthermore, it is sought to avoid pinching the coating at its periphery by using a mold with a positive joint plane.
Mais dans ce cas, apparaissent des bavures sur la pièce, dans le plan de joint du moule. But in this case, burrs appear on the part, in the joint plane of the mold.
En outre, la technique utilisée jusquwalors nécessite de disposer d'un stock important de différents complexes, en fonction du type de revêtement et de l'épaisseur de mousse que l'on désire surmouler. In addition, the technique used hitherto requires having a large stock of different complexes, depending on the type of coating and the thickness of foam which it is desired to overmold.
La présente invention vise à fournir un procédé qui permet la réalisation de pièces en matière plastique comportant un revétement décoratif qui, en plus d'offrir une surface esthétique et agréable au touché, s'adapte parfaitement aux irrégularités de la surface de la pièce, sans former de plis ni subir de déchirures. The present invention aims to provide a process which allows the production of plastic parts comprising a decorative coating which, in addition to offering an aesthetic surface and pleasant to the touch, adapts perfectly to the irregularities of the surface of the part, without creases or tears.
La présente invention a pour objet un procédé de réalisation de pièces en matière plastique recouvertes au moins partiellement par un complexe constitué par une plaque de mousse et un revêtement extérieur, qui est caractérisé par le fait que l'on place une plaque de mousse a l'intérieur d'un moule, que l'on apporte une matière plastique dans le moule, d'un seul côté de la plaque de mousse, pour surmouler ladite plaque de mousse et qu'après refroidissement de la matière plastique, on applique un revêtement sur la face extérieure de la mousse ainsi surmoulée, et l'on fixe ce revêtement à la mousse. The subject of the present invention is a process for producing plastic parts at least partially covered by a complex consisting of a foam plate and an external coating, which is characterized by the fact that a foam plate is placed on the l inside a mold, that a plastic material is brought into the mold, on one side of the foam plate, for overmolding said foam plate and that after cooling of the plastic material, a coating is applied on the outer face of the foam thus overmolded, and this coating is fixed to the foam.
On comprend que le procédé selon l'invention permet de préserver le revêtement des traitements rigoureux imposés par l'étape de moulage. It is understood that the method according to the invention makes it possible to preserve the coating from the rigorous treatments imposed by the molding step.
En outre, le procédé selon l'invention est avantageux en ce qu'il permet de gérer un stock réduit de plaques de mousse d'une part, de revêtements d'autre part. In addition, the method according to the invention is advantageous in that it makes it possible to manage a reduced stock of foam sheets on the one hand, of coatings on the other hand.
Selon l'invention, l'opération qui consiste à apporter une matière plastique dans le moule pour surmouler la plaque de mousse peut être réalisée selon différentes techniques connues. According to the invention, the operation which consists in bringing a plastic material into the mold for overmolding the foam plate can be carried out according to various known techniques.
A titre d'exemple, on peut mettre en oeuvre la technique d'injection classique qui consiste à fermer le moule et à envoyer de la matière plastique à l'état fondu au travers de canaux d'injection débouchant dans le moule. For example, one can implement the conventional injection technique which consists in closing the mold and sending plastic material in the molten state through injection channels opening into the mold.
Selon l'invention, on peut également déposer dans le moule semi-ouvert une galette de matière plastique préchauffée, ou un extrudat de matière plastique, puis refermer le moule pour comprimer la matière plastique et la répandre dans toute la cavité du moule. According to the invention, it is also possible to deposit in the semi-open mold a pancake of preheated plastic material, or an extrudate of plastic material, then close the mold to compress the plastic material and spread it throughout the mold cavity.
D'autres techniques, telles que l'injection-compression ou le soufflage peuvent être mises en oeuvre selon l'invention pour réaliser l'opération d'apport de la matière plastique et de surmoulage de la plaque de mousse. Other techniques, such as injection-compression or blowing can be used according to the invention to carry out the operation of supplying the plastic material and overmolding the foam plate.
Dans un premier mode de réalisation de l'invention, le revêtement extérieur est fixé à la mousse par adhésion, soit au moyen d'un adhésif déposé sur la face extérieure de la plaque de mousse après surmoulage, soit par utilisation d'une plaque de mousse préalablement revêtue d'un couche adhésive, laquelle est protégée pour l'étape de moulage par une pellicule amovible, soit par utilisation d'un revêtement préalablement encollé sur sa face venant au contact avec la mousse. In a first embodiment of the invention, the external covering is fixed to the foam by adhesion, either by means of an adhesive deposited on the external face of the foam plate after overmolding, or by use of a foam previously coated with an adhesive layer, which is protected for the molding step by a removable film, or by the use of a coating previously glued on its face coming into contact with the foam.
Selon un deuxième mode de mise en oeuvre de l'invention, le revétement extérieur est fixé à la mousse après traitement de surface par la technique connue de flammage. According to a second embodiment of the invention, the external coating is fixed to the foam after surface treatment by the known flaming technique.
Conformément à l'invention, l'opération d'application du revétement, également désignée sous le terme d'affichage, consiste à comprimer le revêtement contre la mousse à l'aide d'une empreinte épousant la forme extérieure de la pièce. In accordance with the invention, the operation of applying the coating, also known as display, consists in compressing the coating against the foam with the aid of an imprint conforming to the external shape of the part.
Une telle empreinte peut être un outillage spécifique ou, plus simplement, étre constituée par une partie du moule qui a servi au moulage de la matière plastique. Such an imprint can be a specific tool or, more simply, be constituted by a part of the mold which was used for molding the plastic material.
Selon un troisième mode de mise en oeuvre de l'invention, le revétement est appliqué sur et fixé à la mousse par projection et collage de fibres, selon la technique connue de flocage. According to a third embodiment of the invention, the coating is applied to and fixed to the foam by spraying and bonding of fibers, according to the known flocking technique.
Dans le but de mieux faire comprendre l'invention, on va en décrire maintenant un mode de réalisation donné à titre d'exemple non limitatif en référence au dessin annexé dans lequel
- la figure 1 est une vue en élévation d'un panneau intérieur de portière de véhicule automobile,
- la figure 2 est une vue en coupe selon II-II de la figure 1,
- la figure 3 est une vue en coupe d'un moule permettant la réalisation du panneau de la figure 1,
- la figure 4 est une vue du moule de la figure 3 à petite échelle pendant l'étape d'injection de la matière plastique,
- la figure 5 représente, vue en coupe selon II-II, la pièce en matière plastique revêtue de mousse obtenue après l'étape de surmoulage,
- la figure 6 représente la pièce de la figure 5 pendant l'opération de dépôt d'un adhésif sur la face extérieure de la mousse,
- la figure 7 représente la pièce de la figure 6 pendant l'affichage du revêtement extérieur,
- la figure 8 est une vue de détail de la mousse d'une pièce réalisée selon la technique antérieure,
- la figure 9 est une vue analogue à la figure 8 de la pièce réalisée selon l'invention.In order to better understand the invention, we will now describe an embodiment given by way of non-limiting example with reference to the accompanying drawing in which
FIG. 1 is an elevation view of an interior panel of the door of a motor vehicle,
FIG. 2 is a sectional view along II-II of FIG. 1,
FIG. 3 is a sectional view of a mold allowing the panel of FIG. 1 to be produced,
FIG. 4 is a view of the mold of FIG. 3 on a small scale during the step of injecting the plastic material,
FIG. 5 represents, seen in section on II-II, the plastic part coated with foam obtained after the overmolding step,
FIG. 6 represents the part of FIG. 5 during the operation of depositing an adhesive on the external face of the foam,
FIG. 7 represents the part of FIG. 6 during the display of the external coating,
FIG. 8 is a detailed view of the foam of a part produced according to the prior art,
- Figure 9 is a view similar to Figure 8 of the part produced according to the invention.
Le panneau intérieur de portière 1 représenté sur la figure 1 comporte une pluralité de zones en relief 2 et 3 et en creux 4. The interior door panel 1 shown in FIG. 1 has a plurality of raised areas 2 and 3 and recessed areas 4.
La zone 2 a principalement une fonction décorative, tandis que la zone 3 sert d'accoudoir et la zone 4 correspond à l'emplacement d'un vide-poche. Zone 2 mainly has a decorative function, while zone 3 serves as an armrest and zone 4 corresponds to the location of a storage compartment.
Le panneau 1 comporte également un orifice 5 prévu pour recevoir un tableau de commande, pour la manoeuvre des vitres du véhicule par exemple. The panel 1 also includes an orifice 5 provided for receiving a control panel, for the operation of the vehicle windows for example.
Le bord périphérique 6 du panneau présente une épaisseur réduite. The peripheral edge 6 of the panel has a reduced thickness.
Sur la vue en coupe de la figure 2, on voit clairement la forme en relief de l'accoudoir 3 et la forme en creux 4 correspondant à l'emplacement du vide-poche. On voit également le bord aminci 6. In the sectional view of Figure 2, we can clearly see the relief shape of the armrest 3 and the hollow shape 4 corresponding to the location of the storage compartment. We also see the thinned edge 6.
Le moule représenté sur la figure 3, comporte deux parties 7 et 8. The mold shown in FIG. 3 has two parts 7 and 8.
Pour réaliser le panneau intérieur 1, on place une plaque de mousse 9 d'une épaisseur prédéterminée entre les deux parties 7,8 du moule ouvert, puis on referme le moule. To make the inner panel 1, a foam plate 9 of a predetermined thickness is placed between the two parts 7,8 of the open mold, then the mold is closed.
La plaque de mousse 9 qui présente une certaine élasticité se déforme en conséquence. The foam plate 9 which has a certain elasticity deforms as a result.
La périphérie de la plaque de mousse 9 se trouve alors pincée dans le plan de joint 10 du moule, comme on le voit sur la figure 4. The periphery of the foam plate 9 is then pinched in the joint plane 10 of the mold, as seen in FIG. 4.
La partie 7 du moule comporte des canaux d'injection 11 au travers desquels la matière plastique est introduite dans le moule comme indiqué par les flèches 12. The part 7 of the mold has injection channels 11 through which the plastic material is introduced into the mold as indicated by the arrows 12.
La matière plastique pénètre dans la cavité du moule d'un seul côté de la plaque de mousse 9 et repousse cette dernière contre la partie 8 du moule. The plastic material enters the mold cavity on one side of the foam plate 9 and pushes the latter against the part 8 of the mold.
Selon l'invention, on peut utiliser une matière plastique plus ou moins fluide dont la pression d'injection peut varier de 5 à 20 MPa (50 à 200 bars). According to the invention, a more or less fluid plastic material can be used, the injection pressure of which can vary from 5 to 20 MPa (50 to 200 bars).
A titre d'exemples non limitatifs, on peut citer comme matières plastiques utilisables du polypropylène, du polyéthylène, du polyester, une résine acrylique butadiène styrène, avec ou sans charge, etc... By way of nonlimiting examples, mention may be made, as usable plastics, of polypropylene, polyethylene, polyester, an acrylic resin butadiene styrene, with or without filler, etc.
Dans le cas d'une matière plastique particulièrement fluide, présentant par exemple un indice de fluidité de 50 exprimé selon la norme
ISO 1133, il peut être préférable d'utiliser une plaque de mousse 9 munie sur sa face en regard des orifices d'injection d'un matériau protecteur qui empêche la matière plastique de s'infiltrer dans la mousse.In the case of a particularly fluid plastic, having for example a melt index of 50 expressed according to the standard
ISO 1133, it may be preferable to use a foam plate 9 provided on its face opposite the injection holes with a protective material which prevents the plastic material from infiltrating the foam.
Toutefois, un tel matériau protecteur n'est pas indispensable dans la mesure où même si de très faibles quantités de matière plastique parvenaient à traverser localement la mousse, cela n'aurait pas de conséquence sur l'aspect extérieur du panneau réalisé selon l'invention. However, such a protective material is not essential insofar as even if very small quantities of plastic material manage to pass through the foam locally, this would have no consequence on the external appearance of the panel produced according to the invention .
Après refroidissement de la matière plastique et éjection du moule, on obtient la pièce représentée sur la figure 5 où l'on voit que la périphérie de la plaque de mousse 9 qui était pincée dans le plan de joint 10 du moule, dépasse de la matière plastique moulée et doit être découpée comme indiqué par les flèches 13. After the plastic material has cooled and the mold has been ejected, the part shown in FIG. 5 is obtained, where it can be seen that the periphery of the foam plate 9 which was pinched in the joint plane 10 of the mold, protrudes from the material. molded plastic and should be cut as shown by the arrows 13.
Par pulvérisation ou toute autre méthode connue, on dépose un adhésif sur la face extérieure de la plaque de mousse 9, comme illustré sur la figure 6, et éventuellement sur une des faces d'un revêtement destiné à être appliqué contre la plaque de mousse 9. By spraying or any other known method, an adhesive is deposited on the outer face of the foam plate 9, as illustrated in FIG. 6, and optionally on one of the faces of a coating intended to be applied against the foam plate 9 .
Un revêtement 13, par exemple un tissu, est ensuite affiché sur la mousse à laide d'une empreinte 14 qui vient comprimer le revêtement 13 contre la mousse en lui faisant épouser la forme du panneau. A covering 13, for example a fabric, is then displayed on the foam using an imprint 14 which compresses the covering 13 against the foam by making it conform to the shape of the panel.
I1 suffit alors de rabattre le bord périphérique du revêtement 13 sur l'envers du panneau en le collant dans cette position, comme représenté à la figure 2. I1 then suffices to fold the peripheral edge of the covering 13 onto the back of the panel by gluing it in this position, as shown in FIG. 2.
On obtient ainsi, conformément à l'invention, un panneau dont le revêtement extérieur présente un aspect régulier exempt de défauts tels que des plis ou des déchirures qui apparaissaient dans la technique antérieure. There is thus obtained, in accordance with the invention, a panel whose external coating has a regular appearance free from defects such as folds or tears which appeared in the prior art.
A titre d'exemple, on a représenté sur les figures 8 et 9 une vue de détail en coupe de la région du panneau située en-dessous de l'accoudoir 3 cette région correspondant à celle matérialisée en IX sur la figure 2. By way of example, there is shown in FIGS. 8 and 9 a detail view in section of the region of the panel situated below the armrest 3, this region corresponding to that shown in IX in FIG. 2.
On voit sur la figure 8 que selon la technique antérieure, le revêtement 13 forme un pli 15 dans l'angle situé à la base de l'accoudoir. It can be seen in FIG. 8 that according to the prior art, the covering 13 forms a fold 15 in the corner situated at the base of the armrest.
Ceci est du au fait que lors du moulage, l'excès de tissu repousse la mousse 9. Après le moulage, celle-ci ne peut plus reprendre sa forme initiale dans laquelle sa face extérieure est lisse.This is due to the fact that during molding, the excess fabric repels the foam 9. After molding, the latter can no longer resume its initial shape in which its outer face is smooth.
En revanche, grâce à l'invention, on voit sur la figure 9 que la mousse qui est appliquée lors du moulage contre la partie 8 du moule, conserve sa face extérieure lisse, ce qui permet d'afficher le revêtement 13 sans former de plis. On the other hand, thanks to the invention, it can be seen in FIG. 9 that the foam which is applied during molding against the part 8 of the mold, retains its smooth outer face, which makes it possible to display the coating 13 without forming folds .
De la même manière, les autres défauts usuellement constatés tels que déchirures, tension et moirage, sont évités grâce au procédé selon 1' invention. In the same way, the other faults usually noted such as tears, tension and moire, are avoided by the method according to one invention.
Il est bien entendu que le mode de mise en oeuvre qui vient d'être décrit ne présente aucun caractère limitatif et qu'il pourra recevoir toutes modifications désirables sans sortir pour cela du cadre de l'invention. It is understood that the mode of implementation which has just been described does not have any limiting character and that it can receive any desirable modifications without departing from the scope of the invention.
En particulier, on a décrit un exemple dans lequel la plaque de mousse s'étend sur toute la surface de la pièce en matière plastique. In particular, an example has been described in which the foam plate extends over the entire surface of the plastic part.
Cependant, on peut, selon l'invention, réaliser une pièce en matière plastique comportant une plaque de mousse sur une partie seulement de sa surface, auquel cas le moule doit être muni de moyens permettant de maintenir en place la plaque de mousse lors de son surmoulage. However, it is possible, according to the invention, to produce a plastic part comprising a foam plate on only part of its surface, in which case the mold must be provided with means making it possible to hold the foam plate in place during its overmolding.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9410702A FR2724130B1 (en) | 1994-09-07 | 1994-09-07 | METHOD FOR PRODUCING PLASTIC MATERIALS COMPRISING AN OVER-MOLDED COATING |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9410702A FR2724130B1 (en) | 1994-09-07 | 1994-09-07 | METHOD FOR PRODUCING PLASTIC MATERIALS COMPRISING AN OVER-MOLDED COATING |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2724130A1 true FR2724130A1 (en) | 1996-03-08 |
| FR2724130B1 FR2724130B1 (en) | 1996-12-06 |
Family
ID=9466753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9410702A Expired - Fee Related FR2724130B1 (en) | 1994-09-07 | 1994-09-07 | METHOD FOR PRODUCING PLASTIC MATERIALS COMPRISING AN OVER-MOLDED COATING |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2724130B1 (en) |
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|---|---|---|---|---|
| GB1318696A (en) * | 1969-10-02 | 1973-05-31 | Hille Int Ltd | Upholstering of chairs |
| US3979487A (en) * | 1972-10-02 | 1976-09-07 | M. Lowenstein & Sons, Inc. | Process for manufacturing a foamed resin article having a flocked three dimensional surface design |
| JPS55121032A (en) * | 1979-03-09 | 1980-09-17 | Kasai Kogyo Co Ltd | Manufacturing of interior parts for motorcar |
| DE3128977A1 (en) * | 1981-07-22 | 1983-02-10 | Paul Kiefel Gmbh, 8228 Freilassing | Process and device for producing composite articles |
| JPS5828334A (en) * | 1981-07-31 | 1983-02-19 | Inoue Mtp Co Ltd | Manufacture of profile frame laminate sheet |
| GB2133980A (en) * | 1983-01-31 | 1984-08-08 | Milsco Mfg Co | Membrane covered cushion having indented pattern and method for making same |
| DE3706443A1 (en) * | 1987-02-27 | 1988-09-08 | Kiefel Gmbh Paul | Process and device for coating air-impermeable moulded parts with a film |
| EP0333198A2 (en) * | 1988-03-16 | 1989-09-20 | Sumitomo Chemical Company, Limited | Process for producing a multilayer molded article |
| JPH02164613A (en) * | 1988-12-16 | 1990-06-25 | Kasai Kogyo Co Ltd | Terminal processing method of intermediate contact member in automobile door trim |
| JPH0531747A (en) * | 1991-07-26 | 1993-02-09 | Kanegafuchi Chem Ind Co Ltd | Manufacture of ferrite laminate |
| JPH0692814A (en) * | 1992-09-09 | 1994-04-05 | Shin Etsu Chem Co Ltd | Stabilization of sex pheromone compound |
| EP0596597A1 (en) * | 1992-10-26 | 1994-05-11 | Kasai Kogyo Co., Ltd. | Device and method for fabricating a laminated molded assembly |
-
1994
- 1994-09-07 FR FR9410702A patent/FR2724130B1/en not_active Expired - Fee Related
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|---|---|---|---|---|
| GB1318696A (en) * | 1969-10-02 | 1973-05-31 | Hille Int Ltd | Upholstering of chairs |
| US3979487A (en) * | 1972-10-02 | 1976-09-07 | M. Lowenstein & Sons, Inc. | Process for manufacturing a foamed resin article having a flocked three dimensional surface design |
| JPS55121032A (en) * | 1979-03-09 | 1980-09-17 | Kasai Kogyo Co Ltd | Manufacturing of interior parts for motorcar |
| DE3128977A1 (en) * | 1981-07-22 | 1983-02-10 | Paul Kiefel Gmbh, 8228 Freilassing | Process and device for producing composite articles |
| JPS5828334A (en) * | 1981-07-31 | 1983-02-19 | Inoue Mtp Co Ltd | Manufacture of profile frame laminate sheet |
| GB2133980A (en) * | 1983-01-31 | 1984-08-08 | Milsco Mfg Co | Membrane covered cushion having indented pattern and method for making same |
| DE3706443A1 (en) * | 1987-02-27 | 1988-09-08 | Kiefel Gmbh Paul | Process and device for coating air-impermeable moulded parts with a film |
| EP0333198A2 (en) * | 1988-03-16 | 1989-09-20 | Sumitomo Chemical Company, Limited | Process for producing a multilayer molded article |
| JPH02164613A (en) * | 1988-12-16 | 1990-06-25 | Kasai Kogyo Co Ltd | Terminal processing method of intermediate contact member in automobile door trim |
| JPH0531747A (en) * | 1991-07-26 | 1993-02-09 | Kanegafuchi Chem Ind Co Ltd | Manufacture of ferrite laminate |
| JPH0692814A (en) * | 1992-09-09 | 1994-04-05 | Shin Etsu Chem Co Ltd | Stabilization of sex pheromone compound |
| EP0596597A1 (en) * | 1992-10-26 | 1994-05-11 | Kasai Kogyo Co., Ltd. | Device and method for fabricating a laminated molded assembly |
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| DATABASE WPI Week 8313, Derwent World Patents Index; AN 83-30878k * |
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| PATENT ABSTRACTS OF JAPAN vol. 9, no. 238 (M - 416) 25 September 1985 (1985-09-25) * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2724130B1 (en) | 1996-12-06 |
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