FR3000438A1 - Method for manufacturing substrate with dressing i.e. covering, for interior trim of car, involves arranging marking elements in mold such that marking elements print marks that are projected or recessed on first face - Google Patents

Abstract

The method involves utilizing a cover layer (6) that is provided with a timber film. The timber film is arranged in a mold (14). The cover layer is provided with two surfaces (6A, 6B). A substrate is molded on the second face that is formed in the mold. The cover layer is pressed against marking elements (22) during molding the substrate. The marking elements are arranged in the mold such that the marking elements print marks (26) that are projected or recessed on the first face. The marking elements are placed in the mold that is formed between the first face and a molding surface (16A). An independent claim is also included for a dressing.

Description

The present invention relates to a method of manufacturing a covering, in particular a vehicle interior trim, comprising a substrate and a veneer covering the substrate and comprising a woody leaf.

The veneer includes a first visible face facing away from the substrate and a second masked face facing the substrate. For aesthetic reasons, it may be desirable to provide the first face with veneer decorations. One of the aims of the invention is to propose a manufacturing method for decorating a veneer of a covering, this veneer comprising a woody layer.

For this purpose, the invention proposes a method of manufacturing a covering, in particular a motor vehicle covering, in which a veneer comprising a woody leaf in a mold is provided, the veneer having a first face and a second opposite face, and overmolding a substrate on the second face in the mold, wherein, due to overmolding of the substrate, the veneer is pressed against at least one marking element present in the mold, such that each marking element prints a mark. recessed or protruding on the first side. According to other embodiments, the manufacturing method comprises one or more of the following characteristics, taken in isolation or in any technically possible combination: a marking element is attached in the mold between the first face of the mold; plating and a molding surface against which the plating is pressed due to overmolding of the substrate into the mold; - A marking element remains integral with the veneer after demolding the dressing; a marking element is separated from the plating at the end of the molding; a marking element is provided in the form of a projecting protuberance on a molding surface of the mold against which the veneer is pressed due to the overmolding of the substrate, the protuberance impressing a mark in the first face due to overmoulding of the substrate; the protuberance is integral with the molding surface; a marking element is provided in the form of an indentation on a molding surface of the mold against which the veneer is pressed due to the overmolding of the substrate, this imprint imparting a mark projecting on the first face due to overmoulding of the substrate.

The invention also relates to a covering comprising a substrate and a veneer at least partially covering the veneer, the veneer comprising at least one woody leaf, in particular a wood sheet, the veneer comprising at least one mark printed in hollow or projecting on a visible face of the veneer. The invention and its advantages will be better understood on reading the description which will follow, given solely by way of example, and with reference to the appended drawings, in which: FIG. 1 is a partial sectional view of a skin comprising a substrate and a plating covering the substrate; - Figures 2 to 4 are schematic sectional views of a first mold, illustrating different steps of a first method of manufacturing a dressing; - Figures 5 to 7 are schematic sectional views of a second mold, illustrating different steps of a second method of manufacturing a dressing; - Figures 8 to 10 are sectional views of a third mold, illustrating different steps of a third method of manufacturing a dressing. The covering 2 illustrated in FIG. 1 comprises a plastic substrate 4 and a plating 6 covering the substrate 4. The substrate 4 forms the structure of the covering 2. The substrate 4 is molded with a molding material, for example a plastic material. The substrate 4 is for example injection molded or compression molded. The substrate 4 is overmolded on the veneer 6.

The veneer 6 at least partially covers the substrate 4. The veneer 4 gives the cladding 2 a visual appearance and / or a gratifying touch. The veneer 6 comprises a first visible face 6A facing away from the substrate 4 and a second masked face 6B oriented towards the substrate 4. The veneer 6 comprises at least one woody leaf 8, preferably of natural wood. In the example, the veneer 6 comprises exactly one ligneous leaf. Optionally, the veneer 6 comprises several laminated woody leaves. The veneer 6 optionally comprises a protective coating 10 covering the ligneous leaf on the side of the first face 6A of the veneer 6. The protective coating 10 serves to protect the woody leaf 8, for example against ultraviolet radiation which can cause a accelerated aging of the woody leaf 8. The protective coating may comprise one or more layers. The protective coating 10 is for example a synthetic resin, for example a varnish. The protective coating 10 is colored, transparent or translucent. The veneer 6 comprises a reinforcing layer 12 on the side of the second face 6B of the veneer 6. The reinforcing layer 12 serves to reinforce the ligneous leaf 8, and possibly to promote the bonding of the veneer 6 with the substrate 4.

The reinforcing layer 12 is for example a textile material, such as a fabric or a nonwoven, a sheet of paper or a sheet of rubber. The reinforcing layer 12 is for example laminated on the face of the woody sheet 8 located on the side of the second face 6B of the veneer 6.

The veneer 6 formed of several superimposed layers including a woody leaf is called woody complex. A first method of manufacturing the covering 2 for decorating the veneer 6 is described below with reference to Figures 2 to 4. As illustrated in Figures 2 to 4, a mold 14 comprises a first mold part 16 and a second mold portion 18 movable relative to each other to selectively open the mold 14 by spacing the first mold portion 16 and the second mold portion 18 (Figs. 2 and 4), and close the mold 14 mold by approximation of the first mold portion 16 and the second mold portion 18 (Figure 3). The first mold portion 16 and the second mold portion 18 together define a mold cavity 20 when the mold 14 is closed (Figure 3). The first mold part 16 comprises a first molding surface 16A delimiting the molding cavity 20. The second mold part 18 comprises a second molding surface 18B delimiting the molding cavity 20. In a first step (FIG. veneer 6 is inserted into the mold 14 open between the first mold part 16 and the second mold part 18. The first face 6A of the veneer 6 is oriented towards the first molding surface 16A and the second face 6B of the veneer 6 is oriented to the second molding surface 18B. A marking element 22 is disposed between the first face 6A of the plating 6 and the first molding surface 16A.

In a second step (Figure 3), the mold 14 is closed and molten molding material 24 is introduced into the mold 14, between the veneer 6 and the second molding surface 18B. The molding material is thus molded in the molding cavity 20 to form the substrate 4. More specifically, the molding material is overmolded on the second face 6B of the veneer 6.

In a third step (FIG. 4), the mold 14 is open and the covering 2 comprising the plating 6 and the substrate 4 molded onto the plating 6 is demolded. In the second step, the plating 6 is pressed against the first molding surface 16A due to overmoulding of the substrate 4, more specifically under the effect of the pressure exerted by the molding material on the second face 6B. The veneer 6 is thus shaped against the first molding surface 16A.

In addition, the veneer 6 is pressed against the marking element 22 due to overmoulding of the substrate 4, more specifically under the effect of the pressure exerted by the molding material on the second face 6B during overmoulding, so that that the marking element 22 prints a mark in the veneer 6 In other words, the veneer 6 is embossed by the marking element 22 due to the molding of the substrate 4, more specifically under the effect of the pressure exerted by the molding material on the veneer 6 during overmolding. The veneer locally deforms against the marking element 22. In particular, the woody leaf 8 of the veneer 6 is printed with marks, because of the overmoulding of the substrate 4 on the veneer 6. The marking element 22 prints here a mark 26 recessed on the first face 6A of the plating 6. In the illustrated example, the plastic material 24 is injection molded. The mold 14 is an injection molding mold. For this purpose, the mold 14 comprises at least one feed channel opening into the mold cavity 20 of the closed mold 14 for injecting molten plastic material therein. A supply channel 28 is formed here in the second mold portion 18 and opens on the second molding surface 18B. Alternatively, the plastic is compression molded. To do this, a quantity of molten plastic material is introduced into the open mold 14 and pressurized due to the closing of the mold 14. In one embodiment, after the molding, the element of marking 22 is removed from the veneer 6 so as to leave visible the hollow mark 26 forming a decorative pattern. Alternatively, the marking element 22 remains fixed permanently to the veneer 6 so as to form a decorative insert. The decorative insert is flush with the first face 6A of the veneer 6 or at least partly projecting therefrom. In one embodiment, the marking element 22 is fixed permanently or temporarily on the first face 6A of the veneer 6 before the introduction of the veneer 6 into the mold 14.

Alternatively, the marking element 22 is attached to the first molding surface 16A. In this variant, the marking element 22 is removed from the veneer 6 at the end of the molding or remains permanently attached to the veneer 6 to form a decorative insert as mentioned above. In the latter case, it is possible to fix the marking element 22 temporarily on the first molding surface 16A such that at the end of the molding, the marking element 22 remains secured to the veneer 6.

According to a first possibility, the marking element 22 is mechanically secured to the veneer 6 due to a complementarity of shape with the hollow mark 26 which it prints in the veneer 6 with a greater adhesion force than that between the marking element 22 and the first molding surface 16A.

According to a second possibility, a final bonding adhesive is disposed between the marking element 22 and the veneer 6 with an adhesive force greater than that of a temporary bonding adhesive disposed between the first molding surface 16A and the Marking element 22. A second method of manufacturing the trim for decorating the plating is described hereinafter with reference to Figures 5 to 7, in which numerical references to elements similar to those of Figures 2 to 4 have been preserved. . The second method differs from the first method in that the marking element is defined by a projecting protuberance provided on the first molding surface 16A against which the first face 6A of the veneer 6 is plated due to the molding of the substrate 4. The protuberance 30 is here integral with the second mold part. The veneer 6 is introduced into the open mold (Figure 5). Due to the molding of the substrate (FIG. 6), the veneer 6 is pressed against the protrusion 30 which prints a mark 26 in the first face 6A of the veneer 6. A third method of manufacturing the covering enabling the veneer to be decorated is hereinafter described with reference to Figures 8 to 10, in which numerical references to elements similar to those of Figures 2 to 4 have been retained.

The third manufacturing method differs from the second manufacturing method in that the protuberance is replaced by an indentation 32 in the first molding surface 16A against which the veneer 6 is pressed due to the molding of the substrate 4. Because of the molding of the substrate 4, the veneer 6 is pushed locally into the cavity 32 which prints a mark 34 projecting on the first face 6A of the veneer 6.

It is possible to combine the first method, the second method and / or the third method. It is indeed possible, simultaneously and during the same overmolding operation, to print one or more indented marks each printed by marking element reported in the mold, which is separated or remains attached to the veneer after demolding. , one or more indented marks each printed by a projecting protuberance of the first molding surface and / or one or more protruding indicia each impressed by an indentation in the first molding surface. In Figures 2 to 10, the marking elements (marking elements 22, protuberance 30, impression 32) are shown with a relatively high height relative to the thickness of the plating only for reasons of readability of the drawings. In one embodiment, the marking elements have a height less than the thickness of the plating, in particular a height less than the cumulative thickness of the protective coating and the woody leaf. It is possible to print in the protective coating and / or the woody leaf a plurality of recessed marks and / or a plurality of raised marks so as to impart a grained appearance to the veneer. In particular, in one embodiment, the surface of the mold is provided with a plurality of protuberances and / or impressions for printing a marking imparting a grained appearance to the veneer. After the shaping, the veneer has a general form developable or non-developable. When the veneer has a developable form, preferably, the minimum radius of curvature at a recessed mark or projecting is of the order of 0.2 mm. In particular, the minimum radius of curvature of the concave and convex leaves on the edges of each mark is of the order of 0.2 mm.

When the veneer has a non-developable shape, the radius of curvature and / or the height of each mark in hollow or projecting are a function of the acceptable stretching at the mark in hollow or relief without deterioration of the veneer. The stretching is preferably less than 5%. Thanks to the invention, it is possible to emboss a veneer comprising a woody leaf, that is to say, to print indentations or protruding on the veneer, simply and economically. The printing of the marks is carried out because of overmoulding of a substrate on the veneer, without additional operation. In particular, the woody leaf of the veneer is printed with marks (embossed) due to the molding of the substrate. This makes it possible to obtain skins having a wood veneer with an attractive and / or distinctive visual appearance and / or touch. The invention applies in particular to the interior cladding of a motor vehicle and, more generally, to cladding in other fields, for example in rail or aeronautical transport.

Claims (8)

CLAIMS 1.- A method of manufacturing a covering, including a motor vehicle trim, in which there is a veneer (6) comprising a woody leaf (8) in a mold (14), the veneer (6) having a first face (6A) and an opposite second face (6B), and a substrate (4) is overmolded on the second face (6B) in the mold (14), in which, due to the overmoulding of the substrate (4), the veneer ( 6) is pressed against at least one marking element (22, 30, 32) present in the mold (14), so that each marking element (22, 30, 32) prints a mark (26, 34) in hollow or protruding on the first face (6A). 2. A manufacturing method according to claim 1, wherein a marking element (22) is attached in the mold (14) between the first face (6A) of the plating (6) and a molding surface (16A) against which the plating (6) is pressed due to the over-molding of the substrate (4) in the mold (14). 3. A manufacturing method according to claim 1 or 2, wherein a marking element (22) remains integral with the veneer (6) after demolding the dressing. 4. A manufacturing method according to any one of the preceding claims, wherein a marking element (22) is separated from the veneer (6) after the molding. 5. A manufacturing method according to any one of the preceding claims, wherein a marking element is provided in the form of a protuberance (30) projecting from a molding surface (16A) of the mold (14) against which the plating (6) is pressed due to the over-molding of the substrate (4), the protuberance (30) imprinting a hollow mark in the first face (6A) due to overmoulding of the substrate (4). 6. A manufacturing method according to claim 5, wherein the protuberance is integral with the molding surface (16A). 7. A manufacturing method according to any one of the preceding claims, wherein a marking element is provided in the form of a recess (32) recessed on a molding surface (16A) of the mold (14) against which the veneer (6) is pressed due to the over-molding of the substrate (4), this imprint imparting a protruding mark on the first face (6A) due to the over-molding of the substrate (4). 8. Dressing comprising a substrate (4) and a veneer (6) at least partially covering the veneer (6), the veneer comprising at least one woody leaf, in particular a wood sheet, the veneer (6) comprising at least a mark (26, 34) impressed or projecting on a visible face of the veneer (6).