EP1919684A1 - Piece of trim comprising a skin and production method thereof - Google Patents

Piece of trim comprising a skin and production method thereof

Info

Publication number
EP1919684A1
EP1919684A1 EP06794351A EP06794351A EP1919684A1 EP 1919684 A1 EP1919684 A1 EP 1919684A1 EP 06794351 A EP06794351 A EP 06794351A EP 06794351 A EP06794351 A EP 06794351A EP 1919684 A1 EP1919684 A1 EP 1919684A1
Authority
EP
European Patent Office
Prior art keywords
skin
foam
support
open porosity
open
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06794351A
Other languages
German (de)
French (fr)
Inventor
Jonathan Cassaro
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.)
Faurecia Interieur Industrie SAS
Original Assignee
Faurecia Interieur Industrie SAS
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 Faurecia Interieur Industrie SAS filed Critical Faurecia Interieur Industrie SAS
Publication of EP1919684A1 publication Critical patent/EP1919684A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B29C44/588—Moulds with means for venting, e.g. releasing foaming gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1257—Joining a preformed part and a lining, e.g. around the edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24496—Foamed or cellular component

Definitions

  • Trim member having a skin r and method of manufacture
  • the present invention relates to packing pieces, of the type which comprises a skin carried on a support with interposition of a layer of foam, and a method of manufacturing such a piece of packing.
  • the cooperation part between the marginal part of the skin and the inner surface of the support has two functions, on the one hand that of a vent for the evacuation of the air and, on the other hand, that of a device sealing which prevents the passage of a foam.
  • the skin is formed of a plastic material, for example with elastomeric properties, it is possible to very precisely adjust the properties of the elements used so that the two functions are suitably fulfilled. However, it would be desirable to broaden the adjustment ranges of the various parameters to facilitate the manufacture of such lining pieces.
  • This method makes it possible to obtain the two aforementioned functions, but it requires the sealing strip to be bonded to the inner face of the skin, that is to say the face opposite to the visible face.
  • the invention relates to the production of trim parts that allow the two aforementioned functions to be obtained even when the skin is made of a material whose properties can be variable, for example when the skin is made of leather.
  • the method is applicable to all skin types, since it extends the ranges of physical conditions in which such lining pieces can be made.
  • the aforementioned object is achieved by arranging a strip of a material with open porosity at the level of the cooperation of the marginal part of the skin with the antagonistic surface of the support, between this marginal part and this surface. . Under these conditions, it is not necessary that the band is held on the skin before manufacturing by foam injection. On the other hand, it is advantageous for it to be held by the support, since the manufacture can then be identical to the manufacture of a piece without tape of a material with open porosity, and holding devices such as those described in the aforementioned document. JP-09 262 845 are useless.
  • the invention relates to a lining piece having an apparent skin of which a marginal portion of the apparent face is adjacent to a hidden surface portion of a rigid support against which it is held by a plastic foam disposed between the skin and the support;
  • the part comprises a strip of a material with open porosity, placed substantially along the edge of the skin, in at least partial contact with the marginal part of the visible face of the skin and with the surface part hidden from the support.
  • the open-pored material has sufficient heat resistance that, within the finished liner, at least a portion of the material retains at least a portion of its open porosity.
  • the plastics material of the foam disposed between the skin and the support penetrates at least partially into pores of the open porous material of the web.
  • the open porosity material is a thermoplastic material, for example a polyolefin.
  • the open porosity material is a thermosetting material, such as a polyurethane, and the open porosity material web is formed of rigid foam.
  • the material of the skin is a material having a lack of uniformity of properties, for example leather.
  • the invention also relates to a method of manufacturing a lining piece according to the preceding paragraphs, of the type which comprises the introduction of plastic foam by injection between the skin and the support; according to the invention, the method comprises, prior to the injection introduction step, a step of fixing a strip of open porosity material to an element of the lining piece near the edge of the skin, the element being selected from a marginal portion of the apparent face and a hidden surface portion of the support.
  • the web of the open porosity material is at least partially attached to the support.
  • the web of the open porosity material is partially fixed to the portion marginal of the apparent face of the skin and is partially protruding from the edge.
  • the method comprises, at the end of the introduction of the foam by injection between the skin and the support, the penetration of the plastic material of the foam injected into the pores of the open porosity material.
  • the material with open porosity is a thermoplastic material
  • the method comprises crushing the band of the open porous material at least partially by the material of the injected foam between the skin and the support.
  • FIG. 1 illustrates a step of manufacturing a piece of filling according to the invention
  • Figure 2 illustrates a step of manufacturing another piece of packing according to the invention
  • FIG. 3 represents the final disposition of the lining piece obtained by implementing the method illustrated in FIG. 2
  • FIG. 4 represents the final disposition of another piece of lining obtained by implementing the method according to the invention.
  • the rigid support 10 delimits, by its bottom and a re-entrant cheek 12, a cavity intended to be closed by a flexible skin 16 whose marginal portion enters the cavity at an edge 14 of the support.
  • the edge 18 of the skin is largely inserted towards the bottom of the cavity so that an important marginal portion of the skin is adjacent to the cheek 12 of the support.
  • the cooperation of the marginal part of the skin 16 and the cheek 12 of the support has two functions, that of a vent device allowing the evacuation of the air expelled by the foam, and that of a device for étan ⁇ hééclairage preventing the passage of the fluid plastic material forming the foam.
  • these two functions can be obtained in a reproducible manner, that is to say from one room to another, by incorporation of a strip of porous material open at the edge of the skin 18.
  • a strip of a material with open porosity 22 is held against the support 10, at the location of the edge 18 of the skin 16, by insertion into a groove or by bonding to the rigid support 10.
  • the foam When the foam is injected, the air can easily escape through the open pores of the web 22, even when the edge 18 of the skin is applied against the web 22 of this material.
  • the plastic material of the foam reaches the strip 22, it begins to fill the pores thereof. If the pressure drop created in the band 22 is sufficiently high, the plastic material of the foam can not pass through the foam band, so that the marginal portion of the skin 16 is pressed against the cheek 12 of the support.
  • the pressure difference created in the band 22 ensures the application of the marginal portion skin 16 against the cheek 12 by the foam 20 which is free to come to exert this pressure against the marginal part. So, what whatever the properties of the band 22, the marginal part of the skin is always well applied against the cheek 12 of the support.
  • the web of open porous material 22 is attached to the edge of the skin so that it protrudes from it. Even if the band 22 is distant from the support, as soon as the plastic material of the foam 20 comes into contact with this band 22 which is very light, it moves it against the support so that the only possibility of passage of the foam of the layer 20 is to pass through the band of the material with open porosity 22. As a result, in the same way as in the case of FIG. 1, the marginal portion of the skin 16 is applied against the cheek 12 of the rigid support before the The plastic material of the foam 20 could pass through the web 22 of the open porosity material.
  • Figure 3 shows the appearance that can be obtained in the finished part.
  • the material with open porosity is flexible, it is partially crushed and partially filled with the material of the foam 20, and all the marginal portion of the skin 16 is well applied against the cheek 12 of the rigid support, except the extreme edge 18 which is attached to the strip of the open porosity material now crushed, as indicated at 24, and partially filled with the material of the foam layer 20.
  • FIG. 4 represents a variant of a trim piece according to the invention in which references similar to those of FIGS. 1 to 3 have been used and are followed by the sign '.
  • the marginal portion of the skin 16 ' is well applied by the foam 20' against the cheek 12 'of the rigid support 10', except at the extreme edge 18 'which is fixed to the web 24 'of the open porosity material.
  • the principle of operation of the band of the open-porosity material is the transmission of gases, that is to say the air expelled during the injection of the foam, and the stopping of liquid materials. These two functions can be obtained with rigid foams as well as with flexible foams.
  • the only property that must have the band 22 of the open porosity material is that, during the injection time of the foam 20, it allows the volume of air displaced by the foam to pass. Almost all foams with an open porosity of at least 50% fulfill this condition which is not very restrictive.
  • the chemical nature of the material with open porosity of the strip 22 is not essential insofar as, even if there is a chemical reaction between this material and the plastic material of the foam 20, the reaction is very limited since it takes place only at the end of the injection operation and lasts a short time before the cooling of the room.
  • the foam strip may be a strip of polyurethane foam or polyethylene, and its density may vary between 20 and 180 kg / m 3 .
  • the invention makes it possible to obtain a good seal of a skin, in particular of leather, against a rigid support, with, however, a good evacuation of the air during the injection of the foam.
  • the skin may be of any type
  • the invention is particularly useful when the skin is made of leather, this material of natural origin posing specific problems by its lack of uniformity of certain properties, such as the thickness, flexibility, texture, etc., or other materials with similar difficulties, such as composite materials of which one element is a natural product.

Landscapes

  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a piece of trim comprising a visible skin (16), in which an edge part of the visible surface is positioned adjacent to a concealed surface part of a rigid support (10) and held in place by a plastic foam (20) that is disposed between the skin (16) and the support (10). The inventive piece of trim comprises a strip (22) of open-porosity material, which is placed essentially along the entire length of the edge (18) of the skin in contact at least partially with the edge part of the visible surface of the skin and with the concealed surface part of the support. The open-porosity material has a sufficient heat resistance such that, inside the finished piece, part of the material retains open porosity. The invention is suitable for pieces of trim for motor vehicles.

Description

Pièce de garniture ayant une peau r et son procédé de fabricationTrim member having a skin r and method of manufacture
La présente invention concerne des pièces de garniture, du type qui comprend une peau portée sur un support avec interposition d'une couche de mousse, ainsi qu'un procédé de fabrication d'une telle pièce de garniture.The present invention relates to packing pieces, of the type which comprises a skin carried on a support with interposition of a layer of foam, and a method of manufacturing such a piece of packing.
On sait déjà réaliser des pièces de garniture, notamment pour automobiles , par un procédé qui comprend une étape dans laquelle une mousse de matière plastique injectée entre la peau et le support vient pousser une partie marginale de la peau contre une surface interne cachée du support. La partie marginale de la peau n'est pas fixée au support, si bien que, pendant l'étape d'injection de la mousse, les gaz peuvent s ' échapper entre la peau et le support et éviter la formation de vides dans la pièce. Par contre, lorsque le front de mousse injectée arrive au niveau du bord de la peau, il pousse celle-ci contre le support et assure ainsi une bonne tenue et une bonne étanchéité contre le passage de la matière plastique de la mousse. Ainsi, la partie de coopération entre la partie marginale de la peau et la surface interne du support a deux fonctions , d' une part celle d' un évent pour l ' évacuation de l'air et d'autre part celle d'un dispositif d' étanchéité empêchant le passage d'une mousse. Dans le cas où la peau est formée d'une matière plastique, par exemple à propriétés élastomères, il est possible de régler très précisément les propriétés des éléments utilisés pour que les deux fonctions soient convenablement remplies. Cependant, il serait souhaitable d'élargir les plages de réglage des divers paramètres afin de faciliter la fabrication de telles pièces de garniture .It is already known to produce trim parts, especially for automobiles, by a method which comprises a step in which a plastic foam injected between the skin and the support pushes a marginal portion of the skin against a hidden inner surface of the support. The marginal portion of the skin is not attached to the support, so that during the foam injection step, the gases can escape between the skin and the support and prevent the formation of voids in the room . On the other hand, when the injected foam front arrives at the edge of the skin, it pushes it against the support and thus ensures good resistance and a good seal against the passage of the plastic material of the foam. Thus, the cooperation part between the marginal part of the skin and the inner surface of the support has two functions, on the one hand that of a vent for the evacuation of the air and, on the other hand, that of a device sealing which prevents the passage of a foam. In the case where the skin is formed of a plastic material, for example with elastomeric properties, it is possible to very precisely adjust the properties of the elements used so that the two functions are suitably fulfilled. However, it would be desirable to broaden the adjustment ranges of the various parameters to facilitate the manufacture of such lining pieces.
En outre, lorsque la peau est un matériau naturel à propriétés variables, par exemple du cuir, il est difficile d' obtenir les deux fonctions de la partie marginale d' une manière suffisamment reproductible pour que le taux de pièces défectueuses , soit par formation de cavités , soit par infiltration de mousse, soit réduit. On connaît déjà, d'après le document JP-09262 845, un procédé de fabrication de pièces de garniture dans lequel une bande flexible d'étanchéité est disposée entre la face intérieure de la peau et une partie voisine du support qui est perpendiculaire à la face intérieure de la peau . Sous l'action de la mousse, la bande peut prendre une forme en arc de cercle entre la face interne de peau à laquelle elle est collée et la surface du support. Il est indiqué que la bande peut être formée d'une mousse à cellules ouvertes laissant passer les gaz mais retenant la mousse. Ce procédé permet l'obtention des deux fonctions précitées, mais il nécessite le collage de la bande d'étanchéité à la face intérieure de la peau, c'est-à-dire la face opposée à la face apparente . L'invention a pour objet la réalisation de pièces de garniture qui permettent l ' obtention des deux fonctions précitées même lorsque la peau est formée d'un matériau dont les propriétés peuvent être variables , par exemple lorsque la peau est formée de cuir. Cependant, le procédé s'applique à tous les types de peaux, dans la mesure où il permet d'étendre les plages de conditions physiques dans lesquelles de telles pièces de garniture peuvent être fabriquées .In addition, when the skin is a natural material with variable properties, for example leather, it is difficult to obtain the two functions of the marginal part in a sufficiently reproducible manner so that the rate of defective parts, either by formation of cavities, either by infiltration of foam, or reduced. Document JP-09262 845 already discloses a process for manufacturing packing pieces in which a flexible sealing strip is disposed between the inner face of the skin and a neighboring part of the support which is perpendicular to the inner face of the skin. Under the action of the foam, the band can take an arcuate shape between the inner face of skin to which it is bonded and the surface of the support. It is indicated that the band may be formed of an open-cell foam allowing gas to pass through but retaining the foam. This method makes it possible to obtain the two aforementioned functions, but it requires the sealing strip to be bonded to the inner face of the skin, that is to say the face opposite to the visible face. The invention relates to the production of trim parts that allow the two aforementioned functions to be obtained even when the skin is made of a material whose properties can be variable, for example when the skin is made of leather. However, the method is applicable to all skin types, since it extends the ranges of physical conditions in which such lining pieces can be made.
Selon l'invention, l'objet précité est atteint par disposition d'une bande d'un matériau à porosité ouverte au niveau de la coopération de la partie marginale de la peau avec la surface antagoniste du support, entre cette partie marginale et cette surface. Dans ces conditions, il n'est pas nécessaire que la bande soit tenue sur la peau avant la fabrication par injection de mousse. Il est par contre avantageux qu'elle soit tenue par le support, car la fabrication peut alors être identique à la fabrication d'une pièce sans bande d'un matériau à porosité ouverte, et des dispositifs de tenue tels que décrits dans le document précité JP-09 262 845 sont inutiles. Plus précisément, l'invention concerne une pièce de garniture ayant une peau apparente dont une partie marginale de la face apparente est adjacente à une partie de surface cachée d'un support rigide contre lequel elle est tenue par une mousse de matière plastique disposée entre la peau et le support ; selon l ' invention, la pièce comprend une bande d'un matériau à porosité ouverte, placée pratiquement le long du bord de la peau, en contact au moins partiel avec la partie marginale de la face apparente de la peau et avec la partie de surface cachée du support.According to the invention, the aforementioned object is achieved by arranging a strip of a material with open porosity at the level of the cooperation of the marginal part of the skin with the antagonistic surface of the support, between this marginal part and this surface. . Under these conditions, it is not necessary that the band is held on the skin before manufacturing by foam injection. On the other hand, it is advantageous for it to be held by the support, since the manufacture can then be identical to the manufacture of a piece without tape of a material with open porosity, and holding devices such as those described in the aforementioned document. JP-09 262 845 are useless. More specifically, the invention relates to a lining piece having an apparent skin of which a marginal portion of the apparent face is adjacent to a hidden surface portion of a rigid support against which it is held by a plastic foam disposed between the skin and the support; according to the invention, the part comprises a strip of a material with open porosity, placed substantially along the edge of the skin, in at least partial contact with the marginal part of the visible face of the skin and with the surface part hidden from the support.
De préférence, le matériau à porosité ouverte possède une résistance à la chaleur suffisante pour que, à l'intérieur de la pièce de garniture terminée, une partie au moins du matériau conserve une partie au moins de sa porosité ouverte .Preferably, the open-pored material has sufficient heat resistance that, within the finished liner, at least a portion of the material retains at least a portion of its open porosity.
De préférence, la matière plastique de la mousse disposée entre la peau et le support pénètre au moins partiellement dans des pores du matériau à porosité ouverte de la bande .Preferably, the plastics material of the foam disposed between the skin and the support penetrates at least partially into pores of the open porous material of the web.
Dans un mode de réalisation, le matériau à porosité ouverte est une matière thermoplastique, par exemple une polyoléfine. Dans un autre mode de réalisation, le matériau à porosité ouverte est une matière thermodurcissable, telle qu'un polyuréthanne, et la bande de matériau à porosité ouverte est formée de mousse rigide.In one embodiment, the open porosity material is a thermoplastic material, for example a polyolefin. In another embodiment, the open porosity material is a thermosetting material, such as a polyurethane, and the open porosity material web is formed of rigid foam.
De préférence, le matériau de la peau est un matériau présentant un défaut d'uniformité de propriétés, par exemple le cuir. L' invention concerne aussi un procédé de fabrication d'une pièce de garniture selon les paragraphes précédents, du type qui comprend l'introduction de mousse de matière plastique par injection entre la peau et le support ; selon l'invention, le procédé comprend, avant l'étape d'introduc- tion par injection, une étape de fixation d'une bande d'un matériau à porosité ouverte à un élément de la pièce de garniture à proximité du bord de la peau, l'élément étant choisi parmi une partie marginale de la face apparente et une partie de surface cachée du support. Dans un mode de réalisation, la bande du matériau à porosité ouverte est fixée au moins partiellement au support. Dans un autre mode de réalisation, la bande du matériau à porosité ouverte est partiellement fixée à la partie marginale de la face apparente de la peau et est partiellement en saillie par rapport au bord.Preferably, the material of the skin is a material having a lack of uniformity of properties, for example leather. The invention also relates to a method of manufacturing a lining piece according to the preceding paragraphs, of the type which comprises the introduction of plastic foam by injection between the skin and the support; according to the invention, the method comprises, prior to the injection introduction step, a step of fixing a strip of open porosity material to an element of the lining piece near the edge of the skin, the element being selected from a marginal portion of the apparent face and a hidden surface portion of the support. In one embodiment, the web of the open porosity material is at least partially attached to the support. In another embodiment, the web of the open porosity material is partially fixed to the portion marginal of the apparent face of the skin and is partially protruding from the edge.
De préférence, le procédé comprend, à la fin de l'introduction de la mousse par injection entre la peau et le support, la pénétration de la matière plastique de la mousse injectée dans les pores du matériau à porosité ouverte .Preferably, the method comprises, at the end of the introduction of the foam by injection between the skin and the support, the penetration of the plastic material of the foam injected into the pores of the open porosity material.
De préférence, le matériau à porosité ouverte est une matière thermoplastique, et, à la fin de l'introduction de la mousse, le procédé comprend l'écrasement de la bande du matériau à porosité ouverte au moins partiellement par le matériau de la mousse injecté entre la peau et le support.Preferably, the material with open porosity is a thermoplastic material, and at the end of the introduction of the foam, the method comprises crushing the band of the open porous material at least partially by the material of the injected foam between the skin and the support.
D'autres caractéristiques et avantages de l'invention seront mieux compris à la lecture de la description qui va suivre d'exemples de réalisation, faite en référence au dessin annexé sur lequel : la figure 1 illustre une étape de fabrication d'une pièce de garniture selon l ' invention ; la figure 2 illustre une étape de fabrication d'une autre pièce de garniture selon l'invention ; la figure 3 représente la disposition finale de la pièce de garniture obtenue par mise en oeuvre du procédé illustré par la figure 2 ; et la figure 4 représente la disposition finale d'une autre pièce de garniture obtenue par mise en oeuvre du procédé selon l ' invention .Other characteristics and advantages of the invention will be better understood on reading the following description of embodiments, made with reference to the accompanying drawings in which: FIG. 1 illustrates a step of manufacturing a piece of filling according to the invention; Figure 2 illustrates a step of manufacturing another piece of packing according to the invention; FIG. 3 represents the final disposition of the lining piece obtained by implementing the method illustrated in FIG. 2; and FIG. 4 represents the final disposition of another piece of lining obtained by implementing the method according to the invention.
On décrit d'abord le procédé classique de fabrication des pièces de garniture à peau et support séparées par une couche de mousse de matière plastique. Le support rigide 10 délimite, par son fond et une joue rentrante 12, une cavité destinée à être fermée par une peau souple 16 dont la partie marginale pénètre dans la cavité au niveau d'un bord 14 du support. Le bord 18 de la peau est largement inséré vers le fond de la cavité de manière qu'une partie marginale impor- tante de la peau soit adjacente à la joue 12 du support.First of all, the conventional method of manufacturing the skin and support lining pieces separated by a layer of plastic foam is described. The rigid support 10 delimits, by its bottom and a re-entrant cheek 12, a cavity intended to be closed by a flexible skin 16 whose marginal portion enters the cavity at an edge 14 of the support. The edge 18 of the skin is largely inserted towards the bottom of the cavity so that an important marginal portion of the skin is adjacent to the cheek 12 of the support.
Lorsqu'une mousse de matière plastique 20 est injectée entre le support 10 et la peau 16, elle chasse l'air placé devant elle et celui-ci doit pouvoir s'échapper entre la partie marginale de la peau et la joue 12 du support. Par contre, lorsque le front de la mousse 20 atteint la partie marginale de la peau, il faut que celle-ci soit appliquée contre la joue 12 du support afin que la mousse de matière plastique ne puisse pas s'infiltrer entre la partie marginale de la peau et la joue 12.When a plastic foam 20 is injected between the support 10 and the skin 16, it expels the air placed in front of it and it must be able to escape between the marginal part of the skin and the cheek 12 of the support. On the other hand, when the front of the foam 20 reaches the marginal part of the skin, it must be applied against the cheek 12 of the support so that the plastic foam can not infiltrate between the marginal part of the skin. skin and cheek 12.
Ainsi , la coopération de la partie marginale de la peau 16 et de la joue 12 du support a deux fonctions, celle d'un dispositif évent permettant l ' évacuation de l ' air chassé par la mousse, et celle d'un dispositif d' étanσhéité empêchant le passage de la matière plastique fluide formant la mousse. Selon l'invention, même lorsque la peau 16 a des propriétés variables, par exemple est formée de cuir, ces deux fonctions peuvent être obtenues de manière reproductible , c'est-à-dire d'une pièce à une autre, par incorporation d'une bande d'un matériau à porosité ouverte au niveau du bord de la peau 18.Thus, the cooperation of the marginal part of the skin 16 and the cheek 12 of the support has two functions, that of a vent device allowing the evacuation of the air expelled by the foam, and that of a device for étanσhéité preventing the passage of the fluid plastic material forming the foam. According to the invention, even when the skin 16 has variable properties, for example is made of leather, these two functions can be obtained in a reproducible manner, that is to say from one room to another, by incorporation of a strip of porous material open at the edge of the skin 18.
Sur la figure 1, une bande d'un matériau à porosité ouverte 22 est tenue contre le support 10, au niveau de l'emplacement du bord 18 de la peau 16, par insertion dans une gorge ou par collage au support rigide 10.In FIG. 1, a strip of a material with open porosity 22 is held against the support 10, at the location of the edge 18 of the skin 16, by insertion into a groove or by bonding to the rigid support 10.
Lorsque la mousse 20 est injectée, l'air peut facilement s'échapper par les pores ouverts de la bande 22, même lorsque le bord 18 de la peau est appliqué contre la bande 22 de ce matériau. Lorsque la matière plastique de la mousse atteint la bande 22 , elle commence à remplir les pores de celle-ci . Si la perte de charge créée dans la bande 22 est suffisamment élevée, la matière plastique de la mousse ne peut pas traverser la bande de mousse, si bien que la partie marginale de la peau 16 est bien plaquée contre la joue 12 du support.When the foam is injected, the air can easily escape through the open pores of the web 22, even when the edge 18 of the skin is applied against the web 22 of this material. When the plastic material of the foam reaches the strip 22, it begins to fill the pores thereof. If the pressure drop created in the band 22 is sufficiently high, the plastic material of the foam can not pass through the foam band, so that the marginal portion of the skin 16 is pressed against the cheek 12 of the support.
Même si la perte de charge créée par la bande du matériau à porosité ouverte 22 n'est pas suffisante pour empêcher le passage de la matière plastique de la mousse, la différence de pression créée dans la bande 22 assure l'application de la partie marginale de la peau 16 contre la joue 12 par la mousse 20 qui est libre de venir exercer cette pression contre la partie marginale. Ainsi, quelles que soient les propriétés de la bande 22 , la partie marginale de la peau est toujours bien appliquée contre la joue 12 du support.Even if the pressure drop created by the band of the material with open porosity 22 is not sufficient to prevent the passage of the plastic material of the foam, the pressure difference created in the band 22 ensures the application of the marginal portion skin 16 against the cheek 12 by the foam 20 which is free to come to exert this pressure against the marginal part. So, what whatever the properties of the band 22, the marginal part of the skin is always well applied against the cheek 12 of the support.
Dans le mode de réalisation de la figure 2 , la bande du matériau à porosité ouverte 22 est fixée au bord de la peau de manière qu'elle en dépasse. Même si la bande 22 est distante du support, dès que la matière plastique de la mousse 20 vient au contact de cette bande 22 qui est très légère, elle la déplace contre le support si bien que la seule possibilité de passage de la mousse de la couche 20 est de traverser la bande du matériau à porosité ouverte 22. En conséquence, de la même manière que dans le cas de la figure 1, la partie marginale de la peau 16 est bien appliquée contre la joue 12 du support rigide avant que la matière plastique de la mousse 20 ait pu traverser la bande 22 du matériau à porosité ouverte .In the embodiment of Fig. 2, the web of open porous material 22 is attached to the edge of the skin so that it protrudes from it. Even if the band 22 is distant from the support, as soon as the plastic material of the foam 20 comes into contact with this band 22 which is very light, it moves it against the support so that the only possibility of passage of the foam of the layer 20 is to pass through the band of the material with open porosity 22. As a result, in the same way as in the case of FIG. 1, the marginal portion of the skin 16 is applied against the cheek 12 of the rigid support before the The plastic material of the foam 20 could pass through the web 22 of the open porosity material.
La figure 3 indique l ' aspect qu ' on peut obtenir dans la pièce terminée . Dans le cas représenté sur la figure 3 , le matériau à porosité ouverte est souple, il est partiel- lement écrasé et partiellement rempli du matériau de la mousse 20, et toute la partie marginale de la peau 16 est bien appliquée contre la joue 12 du support rigide, sauf l'extrême bord 18 qui est fixé à la bande du matériau à porosité ouverte maintenant écrasée, comme indiqué en 24, et partiellement remplie du matériau de la couche de mousse 20.Figure 3 shows the appearance that can be obtained in the finished part. In the case shown in FIG. 3, the material with open porosity is flexible, it is partially crushed and partially filled with the material of the foam 20, and all the marginal portion of the skin 16 is well applied against the cheek 12 of the rigid support, except the extreme edge 18 which is attached to the strip of the open porosity material now crushed, as indicated at 24, and partially filled with the material of the foam layer 20.
Par rapport au procédé classique de fabrication de telles pièces de garniture, l'invention nécessite simplement la disposition de la bande de matériau à porosité ouverte 22 contre le support rigide 10 ou au bord 18 de la peau. La figure 4 représente une variante de pièce de garniture selon l ' invention dans laquelle des références analogues à celles des figures 1 à 3 ont été utilisées et sont suivies du signe ' .Compared to the conventional method of manufacturing such pieces of packing, the invention simply requires the arrangement of the open porosity material strip 22 against the rigid support 10 or the edge 18 of the skin. FIG. 4 represents a variant of a trim piece according to the invention in which references similar to those of FIGS. 1 to 3 have been used and are followed by the sign '.
Sur cette figure, comme dans le mode de réalisation précédent, la partie marginale de la peau 16' est bien appliquée par la mousse 20' contre la joue 12' du support rigide 10', sauf à l'extrême bord 18' qui est fixé à la bande 24' du matériau à porosité ouverte. Le principe de fonctionnement de la bande du matériau à porosité ouverte est la transmission des gaz, c'est-à-dire de l'air chassé pendant l'injection de la mousse, et l'arrêt des matériaux liquides . Ces deux fonctions peuvent être obtenues aussi bien avec des mousses rigides qu'avec des mousses souples . La seule propriété que doit posséder la bande 22 du matériau à porosité ouverte est que, pendant la durée d'injection de la mousse 20, elle laisse passer le volume d'air déplacé par la mousse. Presque toutes les mousses ayant une porosité ouverte au moins égale à 50 % remplissent cette condition qui n'est donc pas très contraignante .In this figure, as in the previous embodiment, the marginal portion of the skin 16 'is well applied by the foam 20' against the cheek 12 'of the rigid support 10', except at the extreme edge 18 'which is fixed to the web 24 'of the open porosity material. The principle of operation of the band of the open-porosity material is the transmission of gases, that is to say the air expelled during the injection of the foam, and the stopping of liquid materials. These two functions can be obtained with rigid foams as well as with flexible foams. The only property that must have the band 22 of the open porosity material is that, during the injection time of the foam 20, it allows the volume of air displaced by the foam to pass. Almost all foams with an open porosity of at least 50% fulfill this condition which is not very restrictive.
La nature chimique du matériau à porosité ouverte de la bande 22 n'est pas primordiale dans la mesure où, même s ' il existe une réaction chimique entre ce matériau et la matière plastique de la mousse 20, la réaction est très limitée puisqu'elle n'a lieu qu'à la fin de l'opération d'injection et dure peu de temps avant le refroidissement de la pièce . A titre d'exemple, la bande de mousse peut être une bande de mousse de polyuréthanne ou de polyéthylène, et sa masse volumique peut varier entre 20 et 180 kg/m3.The chemical nature of the material with open porosity of the strip 22 is not essential insofar as, even if there is a chemical reaction between this material and the plastic material of the foam 20, the reaction is very limited since it takes place only at the end of the injection operation and lasts a short time before the cooling of the room. For example, the foam strip may be a strip of polyurethane foam or polyethylene, and its density may vary between 20 and 180 kg / m 3 .
Etant donné que les conditions concernant la porosité ne sont pas très contraignantes, il est même possible d'uti- user d'autres matériaux à porosité ouverte, notamment des feutres .Since the conditions concerning porosity are not very restrictive, it is even possible to use other materials with open porosity, in particular felts.
Ainsi , l ' invention permet l ' obtention d' une bonne étan- chéité d'une peau, notamment de cuir, contre un support rigide, avec cependant une bonne évacuation de l ' air pendant l'injection de la mousse.Thus, the invention makes it possible to obtain a good seal of a skin, in particular of leather, against a rigid support, with, however, a good evacuation of the air during the injection of the foam.
Bien que la peau puisse être de type quelconque, l'invention est particulièrement utile lorsque la peau est constituée de cuir, ce matériau d'origine naturelle posant des problèmes spécifiques par son défaut d'uniformité de certaines propriétés, telles que l'épaisseur, la souplesse, la texture, etc., ou d'autres matériaux présentant des difficultés analogues , tels que des matériaux composites dont un élément est un produit naturel . Although the skin may be of any type, the invention is particularly useful when the skin is made of leather, this material of natural origin posing specific problems by its lack of uniformity of certain properties, such as the thickness, flexibility, texture, etc., or other materials with similar difficulties, such as composite materials of which one element is a natural product.

Claims

REVENDICATIONS
1. Pièce de garniture ayant une peau apparente (16) dont une partie marginale de la face apparente est adjacente à une partie de surface cachée d'un support rigide (10) contre lequel elle est tenue par une mousse (20) de matière plastique disposée entre la peau (16) et le support (10) , caractérisée en ce qu'elle comprend une bande (22) d'un matériau à porosité ouverte, placée pratiquement le long du bord (18) de la peau, en contact au moins partiel avec la partie marginale de la face apparente de la peau et avec la partie de surface cachée du support.A lining piece having an apparent skin (16) having a marginal portion of the apparent face adjacent to a hidden surface portion of a rigid support (10) against which it is held by a plastic foam (20) disposed between the skin (16) and the support (10), characterized in that it comprises a strip (22) of a material with open porosity, placed substantially along the edge (18) of the skin, in contact with the less partial with the marginal part of the apparent face of the skin and with the hidden surface part of the support.
2. Pièce selon la revendication 1, caractérisée en ce que le matériau à porosité ouverte possède une résistance à la chaleur suffisante pour que, à l'intérieur de la pièce de garniture terminée, une partie au moins du matériau conserve une partie au moins de sa porosité ouverte .2. Part according to claim 1, characterized in that the material with open porosity has sufficient heat resistance so that, within the finished lining piece, at least a portion of the material retains at least a portion of the material. its open porosity.
3. Pièce selon l'une des revendications 1 et 2, caractérisée en ce que la matière plastique de la mousse (20) disposée entre la peau (16) et le support (10) pénètre au moins partiellement dans des pores du matériau à porosité ouverte de la bande (22) .3. Part according to one of claims 1 and 2, characterized in that the plastic material of the foam (20) disposed between the skin (16) and the carrier (10) penetrates at least partially into pores of the porous material. open band (22).
4. Pièce selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le matériau à porosité ouverte est une matière thermoplastique. 4. Part according to any one of claims 1 to 3, characterized in that the open porosity material is a thermoplastic material.
5. Pièce selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le matériau à porosité ouverte est une matière thermodurσissable, et la bande (22) de matériau à porosité ouverte est formée de mousse rigide.5. Part according to any one of claims 1 to 3, characterized in that the open porosity material is a thermosurable material, and the strip (22) of open porosity material is formed of rigid foam.
6. Pièce selon l' une quelconque des revendications précédentes, caractérisée en ce que le matériau de la peau est un matériau présentant un défaut d'uniformité de propriétés .6. Part according to any one of the preceding claims, characterized in that the material of the skin is a material having a lack of uniformity of properties.
7. Pièce selon la revendication 6 , caractérisée en ce que le matériau de la peau est le cuir. 7. Part according to claim 6, characterized in that the material of the skin is leather.
8. Procédé de fabrication d'une pièce de garniture selon l'une quelconque des revendications précédentes, du type qui comprend l'introduction de mousse (20) de matière plastique par injection entre la peau (16) et le support (10), caractérisé en ce qu'il comprend, avant l'étape d'introduction par injection, une étape de fixation d'une bande (22) d'un matériau à porosité ouverte à un élément (10, 16) de la pièce de garniture à proximité du bord (18) de la peau, l'élément étant choisi parmi une partie marginale de la face apparente et une partie de surface cachée du support.8. A method of manufacturing a piece of packing according to any one of the preceding claims, of the type which comprises the introduction of foam (20) of plastic material by injection between the skin (16) and the support (10), characterized in that it comprises, before the injection introduction step, a step of fixing a strip (22) of a material with open porosity to an element (10, 16) of the piece of packing near the edge (18) of the skin, the element being selected from a marginal portion of the apparent face and a concealed surface portion of the support.
9. Procédé selon la revendication 8, caractérisé en ce que la bande (22) du matériau à porosité ouverte est fixée au moins partiellement au support (10) .9. The method of claim 8, characterized in that the strip (22) of the open porosity material is fixed at least partially to the support (10).
10. Procédé selon la revendication 8, caractérisé en ce que la bande (22) du matériau à porosité ouverte est partiellement fixée à la partie marginale de la face apparente de la peau et est partiellement en saillie par rapport au bord.10. The method of claim 8, characterized in that the strip (22) of the open porosity material is partially attached to the marginal portion of the apparent face of the skin and is partially projecting from the edge.
11. Procédé selon l'une quelconque des revendications 8 à 10, caractérisé en ce qu'il comprend, à la fin de l'introduction de la mousse (20) par injection entre la peau (16) et le support (10) , la pénétration de la matière plas- tique de la mousse injectée (20) dans les pores du matériau à porosité ouverte .11. Method according to any one of claims 8 to 10, characterized in that it comprises, at the end of the introduction of the foam (20) by injection between the skin (16) and the support (10), penetration of the plastic material of the injected foam (20) into the pores of the open porosity material.
12. Procédé selon l'une quelconque des revendications 8 à 11, caractérisé en ce que le matériau à porosité ouverte est une matière thermoplastique, et, à la fin de l ' intro- duction de la mousse (20) , il comprend l'écrasement de la bande (22) du matériau à porosité ouverte au moins partiellement par le matériau de la mousse (20) injectée entre la peau (16) et le support (10) . 12. A method according to any one of claims 8 to 11, characterized in that the open-pored material is a thermoplastic material, and at the end of the introduction of the foam (20) it comprises the crushing the web (22) of the open porous material at least partially by the material of the foam (20) injected between the skin (16) and the support (10).
EP06794351A 2005-08-25 2006-08-24 Piece of trim comprising a skin and production method thereof Withdrawn EP1919684A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0508752A FR2889992B1 (en) 2005-08-25 2005-08-25 TRIM PIECE HAVING LEATHER SKIN, AND METHOD FOR MANUFACTURING THE SAME
PCT/FR2006/001977 WO2007023224A1 (en) 2005-08-25 2006-08-24 Piece of trim comprising a skin and production method thereof

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EP1919684A1 true EP1919684A1 (en) 2008-05-14

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EP06794351A Withdrawn EP1919684A1 (en) 2005-08-25 2006-08-24 Piece of trim comprising a skin and production method thereof

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US (1) US20080248252A1 (en)
EP (1) EP1919684A1 (en)
JP (1) JP2009505856A (en)
FR (1) FR2889992B1 (en)
WO (1) WO2007023224A1 (en)

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DE102010005009A1 (en) * 2010-01-19 2011-07-21 Faurecia Innenraum Systeme GmbH, 76767 Process for producing a decorative part
DE102010018726B4 (en) * 2010-04-29 2013-08-14 Premium Aerotec Gmbh Method for producing a component provided with at least one hollow profile
DE102012015175A1 (en) * 2012-08-02 2014-02-06 Johnson Controls Gmbh Process for producing a diaphragm unit, and diaphragm unit

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GB2053778A (en) * 1979-07-04 1981-02-11 Ici Ltd Apparatus and process for moulding foamed plastics articles
JP3135837B2 (en) * 1996-03-27 2001-02-19 西川化成株式会社 Skin-integral foamed resin molded product and method for producing the same
DE10150791B4 (en) * 2001-10-15 2006-04-06 Johnson Controls Gmbh PUR foam seal
JP3962589B2 (en) * 2002-01-10 2007-08-22 難波プレス工業株式会社 Cushion body for seat cushion and manufacturing apparatus thereof

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Title
See references of WO2007023224A1 *

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FR2889992B1 (en) 2009-09-04
JP2009505856A (en) 2009-02-12
US20080248252A1 (en) 2008-10-09
WO2007023224A1 (en) 2007-03-01
FR2889992A1 (en) 2007-03-02

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