FR2517252A1 - Moulding expanded polyurethane with prefabricated covers - using cavity tool with lubricated land step around cavity - Google Patents

Moulding expanded polyurethane with prefabricated covers - using cavity tool with lubricated land step around cavity Download PDF

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Publication number
FR2517252A1
FR2517252A1 FR8122693A FR8122693A FR2517252A1 FR 2517252 A1 FR2517252 A1 FR 2517252A1 FR 8122693 A FR8122693 A FR 8122693A FR 8122693 A FR8122693 A FR 8122693A FR 2517252 A1 FR2517252 A1 FR 2517252A1
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France
Prior art keywords
coating
polyurethane
cavity
cover
manufacturing
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FR8122693A
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French (fr)
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Individual
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Priority to FR8122693A priority Critical patent/FR2517252A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B32B5/20—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material foamed in situ
    • 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
    • B29C44/16—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining shaped by the expansion of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/02—Cellular or porous
    • B32B2305/022—Foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles

Landscapes

  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Mouldings of expanded polyurethane with a protective cover are made using a mould cavity with a stepped daylight land (2') on which can rest the borders (R2) of a loose cover (R) introduced as a prefabricated insert. The main cavity surfaces are pretreated with a conventional parting agent but the lands are treated with a viscous fatty coating (4) so that as the moulding matl. expands within the cavity, the borders of the cover can slip (inwards) to allow the cover to adapt to a close fit to the cavity surface. Esp. for mfr. of vehicle steering wheels, bicycle handlebars etc. having a foam pad covered with leather cloth on the boss. Fitting and bonding of the cover is integrated with moulding of the expanded core, to eliminate subsequent assembly and associated fastening by e.g. stitching, welding, adhesives, staples, etc., and associated machinery.

Description

l'invention concerne un procédé de fabrication d'objets comprenant un support en matériau léger du type polyuréthanne, recouvert d'un revêtement définitif du type cuir, vinyl ou autre, et les produits obtenus selon ce procédé. the invention relates to a process for manufacturing objects comprising a support made of light material of the polyurethane type, covered with a definitive coating of the leather, vinyl or other type, and the products obtained according to this process.

L'invention trouve de nombreuses applications, notamment pour la fabrication d'accessoires d'équipement de véhicules automobiles, tels par exemple, les coussins de sécurité pour volants de direction, les volants de direction.... ainsi que d'autres équipements tels que selles de bicyclettes, et d'une manière géne- rale tous produits comprenant un support en matériau léger recouvert d'un revêtement extérieur de protection. The invention finds numerous applications, in particular for the manufacture of accessories for motor vehicle equipment, such as, for example, airbags for steering wheels, steering wheels, etc., as well as other equipment such as as bicycle saddles, and generally all products comprising a support of light material covered with an external protective coating.

On rappelle le procédé classique de fabrication de coupe sins de sécurité pour volants de direction par exemple, ceci pour illustrer non limitativement, l'art antérieur ; les autres produits précités étant réalisés de manière analogue. Recall the conventional method of manufacturing safety sins cut for steering wheels for example, this to illustrate without limitation, the prior art; the other aforementioned products being produced in a similar manner.

Ces produits comprennent une semelle rigide, métallique ou en autre matériau, dont la forme correspond à la forme finale du coussin à obtenir. la semelle métallique peut être placée dans le moule avant la polymérisation des composants du polyuréthanne. Dans ce cas, une fois dégraissée, elle est enduite sur sa face de liaison avec le polyuréthanne, d'un moyen de#liaison ou primaire d'accrochage. Un revêtement en tout matériau approprié, cuir, vinyl, celui connu dans le commerce sous la dénomination "skai", ou similaire, est ensuite rapporté en recouvrement du polyuréthanne aux formes de l'objet à obtenir ; ledit revêtement présente une bordure périphérique pouvant être retournée puis fixae sur la semelle de base, par collage, couture ou autre.En outre, le revêtement peut être solidarisé totalement ou partiellement sur la face apparente et en regard du bloc de polyuréthanne ; il peut être égale- ment amovible. Tout moyen de liaison peut être prévu, selon la destination du produit : collage, couture par fil, cloutage, rivetage ou autre, afin d'assurer l'assemblage de la gaine ou revêtement sur la semelle de base.These products include a rigid sole, metallic or of another material, the shape of which corresponds to the final shape of the cushion to be obtained. the metal soleplate can be placed in the mold before the polyurethane components are polymerized. In this case, once degreased, it is coated on its bonding face with the polyurethane, with a # bonding or primary attachment means. A coating of any suitable material, leather, vinyl, that known in the trade under the name "skai", or the like, is then added in covering of the polyurethane to the shapes of the object to be obtained; said covering has a peripheral border which can be turned over and then fixed on the base sole, by gluing, sewing or the like. In addition, the covering can be joined totally or partially on the visible face and facing the polyurethane block; it can also be removable. Any connection means can be provided, depending on the destination of the product: bonding, sewing with thread, nailing, riveting or other, in order to ensure the assembly of the sheath or coating on the base sole.

le but recherché selon l'invention était de mettre au point un nouveau procédé permettant de supprimer les opérations d'assemblage précitées. the aim sought after according to the invention was to develop a new process making it possible to eliminate the abovementioned assembly operations.

Selon une première caractéristique de l'invention, le procédé consiste à réaliser simultanément l'opération de moussage du polyuréthanne et l'opération de gainage par le revêtement choisi, à partir des phases suivantes : - réalisation d'un moule aux formes et dimensions de l'objet à obtenir, avec une bordure horizontale intermédiaire établie dans la matrice femelle - préparation des surfaces en déposant un agent démoulant sur les faces du moule et sur la face extérieure du revêtement et en enduisant d'un corps gras et visqueux, les portions des plans de joints en contact avec la bordure périphérique du revêtement, les dits plans de joints correspondant en tout ou partie à la largeur de la bordure horizontale - mise en place du revêtement à l'intérieur de la matrice femelle en épousant de manière plus ou moins lâche, les formes de l'objet à obtenir, la bordure périphérique du revetement étant en appui sur la bordure de la matrice ; - après ou avant la fermeture du moule, injection ou dépôt dans ce dernier et contre la face interne du revêtement, des composants de la mousse de polyuréthanne ; - le polyuréthanne en s'expansant, provoque le glissement du revE- tement sur le corps gras et l'agent démoulant, lui faisant épouser les formes à obtenir ; - démoulage du produit obtenu ; - ébavurage éventuel du pourtour périphérique. According to a first characteristic of the invention, the method consists in simultaneously carrying out the foaming operation of the polyurethane and the sheathing operation by the chosen coating, from the following phases: - production of a mold with the shapes and dimensions of the object to be obtained, with an intermediate horizontal border established in the female matrix - surface preparation by depositing a release agent on the faces of the mold and on the external face of the coating and by coating with a fatty and viscous body, the portions joint planes in contact with the peripheral border of the covering, the said joint plans corresponding in whole or in part to the width of the horizontal border - positioning of the covering inside the female matrix by marrying in a more or less less loose, the shapes of the object to be obtained, the peripheral edge of the coating being supported on the edge of the matrix; - after or before the closing of the mold, injection or deposit in the latter and against the internal face of the coating, of the components of the polyurethane foam; - polyurethane, by expanding, causes the coating to slide over the fatty substance and the release agent, making it conform to the shapes to be obtained; - release of the product obtained; - possible deburring of the peripheral periphery.

Ces caractéristiques et d'autres encore ressortiront bien de la suite de la description. These characteristics and others will emerge clearly from the following description.

Pour fixer l'objet de l'invention, sans toutefois le limiter, aux figures des dessins ~ù
la figure 1 illustre un exemple d'application non limitatif du procédé de fabrication selon l'invention pour un coussin de sécurité de volant de direction ;
la figure 2 est une vue en coupe à grande échelle, selon la ligne I - I de la figure 1, illustrant la liaison du revêtement et du bloc polyuréthanne
la figure 3 est une vue de dessus du moule, illustrant le positionnement du revêtement
La figure 4 est une vue en coupe schématique illustrant la première phase du procédé ;
la figure 5 est une vue en coupe schématique illustrant le produit obtenu, avant démoulage.To fix the subject of the invention, without however limiting it, to the figures of the drawings ~ ù
FIG. 1 illustrates an example of nonlimiting application of the manufacturing method according to the invention for a steering wheel airbag;
Figure 2 is a sectional view on a large scale, along the line I - I of Figure 1, illustrating the connection of the coating and the polyurethane block
Figure 3 is a top view of the mold, illustrating the positioning of the coating
Figure 4 is a schematic sectional view illustrating the first phase of the process;
Figure 5 is a schematic sectional view illustrating the product obtained, before demolding.

Afin de rendre plus concret l'objet de l'invention, on le décrit maintenant d'une manière non limitative en se référant aux exemples de réalisation illustrés aux figures des dessins.  In order to make the object of the invention more concrete, it is now described in a nonlimiting manner with reference to the exemplary embodiments illustrated in the figures of the drawings.

le moule (#) comprend une matrice mâle (i) et une matrice femelle (2) agencée intérieurement pour définir les formes du produit à obtenir, par exemple, un coussin de sécurité adaptable sur un volant de véhicule automobile. A cet effet, la matrice femelle (2) présente une bordure horizontale (21), intermédiaire, entre le fond (22) correspondant aux formes extérieures du produit à obtenir et le plan d'appui (23) sur lequel s'ajuste le plan correspondant de la matrice mâle (1). the mold (#) comprises a male matrix (i) and a female matrix (2) arranged internally to define the shapes of the product to be obtained, for example, a safety cushion adaptable to a steering wheel of a motor vehicle. To this end, the female matrix (2) has a horizontal border (21), intermediate, between the bottom (22) corresponding to the external shapes of the product to be obtained and the support plane (23) on which the plane adjusts. correspondent of the male matrix (1).

Selon le procédé, un agent démoulant (3), connu en soi, est préalablement posé sur les faces du moule et sur la face extérieure (R1) du revttenent (R). On enduit ensuite d'un corps gras et visqueux (4), selon une couche d'épaisseur appropriée, les portions des plans de joints (5) en contact avec la bordure périphérique (R2) du revêtement (R), lesdits plans de joints (5) correspondant en tout ou partie, à la largeur de la bordure horizontale (21) de la matrice femelle. According to the method, a release agent (3), known per se, is previously placed on the faces of the mold and on the outer face (R1) of the coating (R). Then coated with a fatty and viscous substance (4), according to a layer of appropriate thickness, the portions of the joint planes (5) in contact with the peripheral edge (R2) of the coating (R), said joint planes (5) corresponding in whole or in part, to the width of the horizontal border (21) of the female matrix.

le revêtement (R) est ensuite positionné à l'intérieur de la matrice femelle, en épousant de manière plus ou moins lâche, les formes de l'objet à obtenir, ledit revêtement venant, par sa bordure périphérique (R2), en appui sur les plans de joints (5), Com- me illustré figure 4 plus particulièrement. On procède ensuite à l'introduction dans le moule, des composants du polyuréthanne. the covering (R) is then positioned inside the female matrix, more or less loosely matching the shapes of the object to be obtained, said covering coming, by its peripheral edge (R2), pressing on the joint surfaces (5), as illustrated in FIG. 4 more particularly. The components of the polyurethane are then introduced into the mold.

Cette opération peut s'effectuer par injection desdits eomposants, après fermeture du moule par le positionnement de la matrice mâle, ou par le dépôt desdits composants, selon un dosage préétabli, avant le positionnement en fermeture de la matrice mâle. Dans les deux cas, le polyuréthanne est introduit contre la face interne du revêtement utilisé. Son expansion provoque ensuite le glissement du revêtement sur le corps gras, ledit revetement épousant alors les formes du produit à obtenir. Cette.phase du procédé est illustrée figure 5 des dessins. De ce fait et selon la caractéristique inventive du procédé, on réalise simultanément 1'opératio 4e moussage du polyuréthanne et l'opération de gainage par le revêtement choisi tel que cuir, vinyl ou autre. il s'opère alors une étroite liaison entre la mousse de polyuréthanne et le revêtement proprement dit.This operation can be carried out by injecting said components, after closing the mold by positioning the male matrix, or by depositing said components, according to a predetermined dosage, before positioning the male matrix in closing. In both cases, the polyurethane is introduced against the internal face of the coating used. Its expansion then causes the coating to slide over the fatty substance, said coating then conforming to the shapes of the product to be obtained. This phase of the process is illustrated in FIG. 5 of the drawings. Therefore and according to the inventive characteristic of the process, the 4th foaming operation of the polyurethane and the sheathing operation are carried out simultaneously with the chosen coating such as leather, vinyl or other. there is then a close connection between the polyurethane foam and the coating itself.

Après démoulage, il suffit d'effectuer selon les besoins, un léger ébavurage sur la bordure périphérique de l'ensemble ob- tenu. After demolding, it suffices to perform a light deburring on the peripheral edge of the assembly obtained, as required.

la mousse de polyuréthanne peut être de tout type, mais de préférence on choisit de la mousse à peau ou mousse intégrale pour ses caractéristiques mécaniques limitant les risques de déchirures, etc... the polyurethane foam can be of any type, but preferably skin foam or integral foam is chosen for its mechanical characteristics limiting the risks of tearing, etc.

le procédé de fabrication ainsi décrit trouve de nombreuses applications pour des selles de bicyclettes par exemple, des volants de voiture et autres. the manufacturing process thus described finds numerous applications for saddles for bicycles for example, car steering wheels and the like.

les avantages ressortent bien de la description, en particulier on souligne : - la simplification des méthodes de traitement - la réduction des coûts de revient par la suppression :
- des opérations généralement manuelles pour le gai
nage,
- des accessoires tels que colle, fil, clous et autres,
- des outillages spéciaux ou non pour le gainage
(machine à coudre par exemple) - la qualité irréprochable des produits réalisés selon ce procédé; - l'aspect extérieur fini du produit et notamment sur le pourtour périphérique.the advantages clearly emerge from the description, in particular it is emphasized: - the simplification of the processing methods - the reduction of the production costs by the elimination:
- generally manual operations for the gay
swim,
- accessories such as glue, wire, nails and others,
- special tools or not for cladding
(sewing machine for example) - the impeccable quality of the products produced according to this process; - the finished external appearance of the product and in particular on the peripheral periphery.

L'invention ne se limite aucunement à celui de ces modes d'application, non plus qu'à ceux des modes de réalisation de ces diverses parties ayant plus spécialement été indiqués ; elle en embrasse au contraire toutes les variantes.  The invention is in no way limited to that of these modes of application, nor to those of the embodiments of these various parts which have been more particularly indicated; on the contrary, it embraces all its variants.

Claims (5)

##E V E N D I C A T I O N S## E V E N D I C A T I O N S -1- Procédé de fabrication d'objets comprenant un support en matériau léger du type polyuréthanne et un revêtement extérieur de protection, et les objets obtenus seLon ce procédé, caractérisés en ce qu on réalise simultanément l'opération de moussage du polyuréthanne et l'opération de gainage par le revêtement choisi, à partir des phases suivantes :: - réalisation d'un moule aux formes et dimensions de l'objet à obtenir, avec une bordure horizontale intermédiaire (21) établie dans la matrice femelle - préparation des surfaces en déposant un agent démoulant (3) sur les faces du moule et sur la face extérieure (R1) du revêtement (R) et en enduisant d'un corps gras et visqueux (4) les portions des plans de joints (5) en contact avec la bordure périphérique (R2) du revêtement (R), lesdits plans de joints correspondant en tout ou partie, à la largeur de la bordure horizontale (21) - mise en place du revêtement à l'intérieur de la matrice femelle en épousant de manière plus ou moins lâche, les formes de l'objet à obtenir, la bordure périphérique (R2) du revetement étant en appui sur la bordure (21) - après ou avant la fermeture du moule, injection ou dépôt dans ce dernier et contre la face interne du revêtement, des composants de la mousse de polyuréthanne ; - le polyuréthanne#'expansant, provoque le glissement du rev8te- ment sur le corps gras (4) et l'agent démoulant (3), lui faisant épouser les formes à obtenir - démoulage du produit obtenu ; - ébavurage éventuel du pourtour périphérique. -1- A method of manufacturing objects comprising a support made of light material of the polyurethane type and an external protective coating, and the objects obtained according to this method, characterized in that the foaming operation of the polyurethane and the sheathing operation by the chosen coating, from the following phases: - production of a mold with the shapes and dimensions of the object to be obtained, with an intermediate horizontal border (21) established in the female matrix - preparation of the surfaces in depositing a release agent (3) on the faces of the mold and on the external face (R1) of the coating (R) and by coating with a fatty and viscous body (4) the portions of the joint planes (5) in contact with the peripheral edge (R2) of the covering (R), said joint planes corresponding in whole or in part, to the width of the horizontal edge (21) - positioning of the covering inside the female matrix by fitting so more or less loose, l he shapes of the object to be obtained, the peripheral border (R2) of the coating being supported on the border (21) - after or before the closing of the mold, injection or deposit in the latter and against the internal face of the coating, components of polyurethane foam; - the expanding polyurethane, causes the coating to slide on the fatty substance (4) and the release agent (3), making it conform to the shapes to be obtained - release of the product obtained; - possible deburring of the peripheral periphery. -2- doyen de mise en oeuvre du procédé selon la revendication 1, caractérisé en ce que la mousse de polyuréthanne est du type mousse à peau ou mousse intégrale. -2- dean of implementation of the method according to claim 1, characterized in that the polyurethane foam is of the skin foam or integral foam type. -3- Procédé de fabrication selon la revendication 1 et son application pour la réalisation de coussins de sécurité pour volants de direction. -3- The manufacturing method according to claim 1 and its application for the production of safety cushions for steering wheels. -4- Procédé de fabrication selon la revendication 1 et son application pour la réalisation de volants de direction.  -4- The manufacturing method according to claim 1 and its application for the production of steering wheels. -5- Procédé de fabrication selon la revendication 1 et son application pour la réalisation de selles de bicyclettes.  -5- The manufacturing method according to claim 1 and its application for the production of bicycle saddles.
FR8122693A 1981-11-30 1981-11-30 Moulding expanded polyurethane with prefabricated covers - using cavity tool with lubricated land step around cavity Withdrawn FR2517252A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8122693A FR2517252A1 (en) 1981-11-30 1981-11-30 Moulding expanded polyurethane with prefabricated covers - using cavity tool with lubricated land step around cavity

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Application Number Priority Date Filing Date Title
FR8122693A FR2517252A1 (en) 1981-11-30 1981-11-30 Moulding expanded polyurethane with prefabricated covers - using cavity tool with lubricated land step around cavity

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FR2517252A1 true FR2517252A1 (en) 1983-06-03

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1413426A1 (en) * 2002-10-22 2004-04-28 Trw Vehicle Safety Systems, Inc. Wrapped steering wheel free of adhesive interface
WO2015160482A1 (en) * 2014-04-14 2015-10-22 Nike, Inc. Footwear upper components having contoured foam regions and methods of forming such components

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1413426A1 (en) * 2002-10-22 2004-04-28 Trw Vehicle Safety Systems, Inc. Wrapped steering wheel free of adhesive interface
WO2015160482A1 (en) * 2014-04-14 2015-10-22 Nike, Inc. Footwear upper components having contoured foam regions and methods of forming such components
CN106163315A (en) * 2014-04-14 2016-11-23 耐克创新有限合伙公司 There is the footwear uppers parts in contoured foam region and the method for this parts of formation
CN106163315B (en) * 2014-04-14 2018-02-09 耐克创新有限合伙公司 The method of footwear uppers part and this part of formation with contoured foam region
US9937644B2 (en) 2014-04-14 2018-04-10 Nike, Inc. Footwear upper components having contoured foam regions and methods of forming such components
US10800074B2 (en) 2014-04-14 2020-10-13 Nike, Inc. Footwear upper components having contoured foam regions and methods of forming such components

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