FR2606289A1 - METHOD FOR MANUFACTURING A SKI CONSTITUENT ELEMENT - Google Patents

Abstract

THE SUBJECT OF THE PRESENT INVENTION IS A PROCESS FOR MANUFACTURING A SKI ELEMENT WHICH PRESENTS A MECHANICAL CARRYING LAYER WITH HIGH MODULUS EELASTICITY, A DECORATIVE LAYER AS IF APPLICABLE, ON IT A TRANSPARENT COATING LAYER OR TRANSLUCENT COATING LAYER. THIS PROCESS IS CHARACTERIZED IN THAT, TO PREPARE A COMPOSITE MATERIAL, A LAYER 3 IS PREPARED OF A HARDENABLE LIQUID SYNTHETIC RESIN, OR DUROMER, POSSIBLE IN EPOXY RESIN, ONE OR MORE LAYERS OF A FIBROUS MATERIAL IS THEN APPLIED TO THIS LAYER AT LEAST ONE OF WHICH IS FORMED OF A THIN TABLECLOTH OF NON-WOVEN MATERIAL 5, 8, WHICH PRESENTS A DECORATIVE SURFACE, AND WHICH Sinks AT LEAST PART INTO THE LAYER OF LIQUID SYNTHETIC RESIN 3, THEN A SECOND IS APPLIED LIQUID SYNTHETIC RESIN LAYER 14, 18 AND OR EITHER A TRANSPARENT COATING LAYER 9, 17 OR A TRANSLUCENT COATING LAYER 9, 17, ALL THEN PRESSED IN A HOT PRESS TO PRODUCE CURING OF THE SYNTHETIC RESIN AT HIGHER TEMPERATURE AND OBTAIN A COMPOSITE MATERIAL WHICH FINALLY FORM A PART OF THE SKI STRUCTURE.

Description

AT

  METHOD FOR MANUFACTURING A SKI CONSTITUENT ELEMENT

  The invention relates to a method of manufacturing a component of a ski which has a mechanical carrier layer with a high modulus of elasticity E, a decorative layer and, thereon, a transparent coating layer or a layer translucent coating. Components of skis of the above kind have already been used in the ski industry for many years and in various ways. In an element constituting a known skis sole or skid face, for example, the part opposite the polyethylene sole is printed with a decoration, for example the name of the manufacturer of the ski and then,

  a layer of lacquer or colored varnish is applied.

  This decoration can be seen through the transparent polyole

  thylène. This insole thus printed and lacquered is then glued for example with a laminate of epoxy resin and glass fibers to form the finished ski sole element, o the laminate of epoxy resin and glass fibers, thanks to its high tensile strength and

  its modulus high elasticity E, forms the mechanical lower chord

  as a carrier of the ski structure. Although it can be applied in a variety of ways during manufacturing, in particular by various multicolored and complicated decor configurations, the realization of

  this sole element is relatively expensive.

  The invention relates to a method of manufacturing a ski element of the type indicated above, which is inexpensive, even in the case of polychrome decor configurations, and which can be realized with a high dimensional accuracy until there unknown in the reproduction of scenery, and allows the obtaining of elements of ski

  lending to the most diverse applications.

  The invention makes it possible to overcome the drawbacks of the prior art by a method which is characterized in that, to prepare a composite material, a layer of a curable liquid resin or curable resin, or possibly an epoxy resin, is prepared. one or more layers of a fibrous material are then applied to this layer, at least one of which is formed of a thin sheet of fibrous nonwoven material which has a decorative surface and which at least part of the liquid synthetic resin layer, then, if necessary, a second layer of liquid synthetic resin and / or a transparent coating layer or a translucent coating layer is applied, the whole being then pressed in a heat press to causing the synthetic resin to harden at elevated temperature and form a composite material to be shaped to form

  elements of the structure of the ski.

  Preferably, as nonwoven material webs incorporated, webs of nonwoven material made of mineral fibers, for example glass fibers, are used, and the face on which the decoration is affixed is coated with a porous synthetic stabilizing coating. thermoplastic. According to an advantageous embodiment of the process according to the invention, at least on the first layer

  liquid synthetic resin, a layer of fibrous reinforcing

  cement, then one or more layers of fibers that sink into the

  layer of liquid synthetic resin.

  According to another preferred embodiment of the invention, the fiber web is immediately applied to the first layer of

synthetic resin liquid.

  According to another advantageous embodiment of the process

  according to the invention, the layer of reinforcing material incor-

  pored, is formed at least for the most part of one or more tissues

  fibers, possibly fiberglass fabrics.

  According to another advantageous embodiment of the process according to the invention, the decorated surface is incorporated by at least one of the nonwoven fibrous webs used and

  the shape of a mono or polychrome printing pattern.

  According to another advantageous embodiment of the method according to the invention, which applies to the case where two fibrous webs of nonwoven material are used, at least one of them comprises a monochrome pattern whereas at least a part of the

  surface of the other tablecloth is provided with a pattern by printing.

  According to another preferred embodiment of the invention, the monochrome surface of one of the fiber sheets is coated with a

  color layer applied by casting.

  One can then advantageously print an additional decorative pattern on the monochrome layer applied by casting. According to another advantageous embodiment of the invention, the process according to the invention is characterized in that a coating material is used which, during pressing, does not bind or weakly bind to the thermoplastic synthetic resin, this coating layer being removed during assembly of the ski element

to form the ski.

  This coating layer may advantageously be formed of a fabric

  synthetic fiber, optionally a polyamide fabric.

  According to a last advantageous embodiment of the process according to the invention, the second layer of liquid synthetic resin is first applied to the back of a coating layer, the assembly thus obtained in the form of a partial composite. then being applied

  on the stack of layers previously formed.

  FIGS. 1 to 3 each show a diagrammatic exploded view, in section, of one of the preferred embodiments obtained by the method according to the invention, for the manufacture of a composite material by bonding layers together, composite materials as well as obtained in the form of strips suitable for use as

constituent elements of the ski.

  According to the first embodiment illustrated in FIG. 1 attached, obtained by carrying out the process according to the invention, this composite material is obtained by application to a press plate (2) covered with a separating sheet (1). a layer (3) of a curable liquid synthetic resin (duromeric) under

  form of an epoxy-hardener resin mixture at a rate of about 800g / m2.

  A fiberglass fabric (4) having a surface density of 600 g / m 2 is then applied, acting as a layer of reinforcing or reinforcing material. A first web of nonwoven material (5) having a surface density of 50 to 100 g / m 2 made of glass fibers and provided on one of its faces with a porous stabilizing coating (50 g / m 2) is then added thereto. m2) thermoplastic synthetic material, which is coated by casting a layer (6) colored. Then, a thinner nonwoven material web (8) of the same material as the web (5) is added but which nevertheless has a printed decoration (7) on the coated side, the

  glass (4) and the two webs of nonwoven material (5) and (8) are

  cant in the layer of liquid synthetic material 3.

  On the assembly, a transparent coating plate is applied (9)

  approximately 0.6 mm thick, made of the material called ABS (acrylic

  nitrile butadiene styrene) and on it a second separate sheet

  trice (10). The composites formed of the various layers thus prepared are stacked one on top of the other to form a single composite that

  it is placed in a heated press and cured.

  Thus, the glass fabric (4) and the two webs of nonwoven material (5 and 8) are bonded in and on the epoxy resin matrix resin and the ABS coating plate 9 to form the material. composite that is removed from the press and cut into strips to form ski components. By the method described above, the pattern (7) printed on the surface of the fibrous web of nonwoven material does not cover the entire surface of this web of nonwoven material. Since, during the pressing and curing of the epoxy resin, the fibers of this nonwoven web are intimately bonded to the epoxy resin and this

  hardened epoxy resin forms with the fibers included therein a

  transparent material, the colored layer cast on the non-woven web of fibers (5) lying underneath and forming a background color appears through those areas of the surface of the web.

  of nonwoven material 8 on which no printing has been made.

  The ski element thus manufactured, which has a thickness of about 1.3 mm, is ground on its side adjacent to the glass fabric 4 and can serve as a surface element, for example during the manufacture of skis with a core or core. foam. The cover plate (9) serves as

  mechanical protection layer for the ski surface.

  According to an advantageous variant of the manufacturing method according to the invention, it is possible to include, instead of two, a single ply of nonwoven material in which case the printed decoration will cover the whole of

  the surface of said web of nonwoven material.

  In the previously described process variants, a hard thermoplastic plastic coating layer or plate is advantageously used which is either translucent or transparent, for example ABS, which is easily bonded to the hot-pressed epoxy resin. This layer or covering plate which serves as a protective layer of the surface of the ski does not need to be subjected to finishing machining during the manufacture of the ski, or must

only to a small extent.

  In many cases, such a layer of synthetic coating is not desired. To meet this requirement, according to the method according to the present invention, with reference to FIG. 2, another embodiment is proposed in which operation is first carried out as described with reference to FIG. 1, FIG. difference that one only uses a proportion of the epoxy-hardener resin mixture that

  approximately 250 g / mm 2 and no coating plate 9 is superimposed.

  Instead, the stacking is completed by the application of a partial composite (11) which is prepared as follows. On a separating sheet (12), a fine fabric of polyamide fibers (13) having a surface specific mass of the order of, for example, 70 g / m 2 is applied and on which the same epoxy resin-hardener mixture is applied. for the layer (3 ') in a proportion of about 600g / m2 to form the

  layer (14). This partial composite (11) is then returned and,

  che (14) being directed downwards, placed on the stack. The pressing and curing and the subsequent operations are carried out as described with reference to FIG. 1. The polyamide fiber fabric (13) does not bind or binds with the cured epoxy resin of the

layer (14).

  When using the ski element thus obtained, the fabric (13) is removed, for example after manufacture of the raw ski, leaving behind a very regular roughness surface on which, for example, it is then possible to apply without further preparation. a lacquer or a

surface lacquer colorless.

  The method according to the invention may, as will be described with reference to FIG. 3, advantageously be applied to the manufacture

elements of ski soles.

  As already described with reference to FIG. 1, on a pressing plate (2) covered with a separation sheet (1), a layer (3 ") of an epoxy resin / hardener mixture with a surface density of about 800 g / m 2 to which the glass fiber fabric (4) is then applied, Finally, a web of nonwoven material (5 ') is applied at the rate of, for example, 50 g / m 2 and of the same nature as the web of nonwoven material (5) of the variant according to Figure 1. This web of nonwoven material (5 ') has on its face

  as a background color, a colored cast coat

  (15) having a printed decorative pattern or an impression

decorative (7 ').

  The two following layers of the stack of layers to be formed are applied in the form of a partial composite (16) for the manufacture of which on a translucent polyethylene plate (17) having a thickness of 1.2 mm, for example acting as a ski sole material, a layer (18) of a thickness is applied as for the layer (3 "),

  for example, 1.2 mm of an epoxy resin-hardener mixture in proportion to

  the order of 500g / m2. The partial composite (16) is then return-

  born and placed on the stack, the layer (18) down. Finally, a separator paper (18) is added and the whole is pressed, hardened and used

  later as described with reference to FIG.

Claims (12)

  1.- A method of manufacturing a ski element which respectivemient has a mechanical carrier layer with high modulus of elasticity E, a decorative layer and on it a transparent coating layer or a translucent coating layer, this method characterized in that, in order to prepare a composite material, a layer (3) of a liquid curable, or duromeric, synthetic resin is prepared, optionally of epoxy resin, then one or more layers of a fibrous material are applied thereto. at least one of which is formed from a thin web of fibrous nonwoven material (5, 8) which has a decorative surface and which at least partially penetrates into the liquid synthetic resin layer (3) then, if necessary, applying a second layer of liquid synthetic resin (14, 18) and / or either a transparent coating layer (9, 17) or a translucent coating layer (9, 17), all of which is then pressed in a hot press to cause the high temperature synthetic resin to harden and form a composite material to be   shaped to form elements of the ski structure.   2. A process according to claim 1, characterized in that as sheets of nonwoven material incorporated are used webs of nonwoven material formed of mineral fibers, for example glass fibers, and the face on which is affixed the decoration is wearing a   porous stabilizing coating made of thermoplastic synthetic material.   3. Process according to claim 1 or 2, characterized in that   then, at least on the first layer of syn-   liquid thistle (3), a layer of fibrous reinforcing material, and then one or more layers of fibers (5, 8) which penetrate into the   liquid synthetic resin layer (3).   4. Method according to one of claims 1 or 2, characterized in that   the fiber web is immediately applied to the first layer   of synthetic liquid resin (3).   5. A process according to any one of claims 1 to 4, characterized   in that the layer of reinforcing material incorporated is formed at least in the major part of one or more fiber fabrics,   optionally fiberglass fabrics (4).   6. A process according to any one of claims 1 to 5, characterized   in that the decorated surface is incorporated by at least one of the fibrous webs of nonwoven nonwoven material used and under the   form of a mono or polychrome printing pattern (7). 260 6 2 8 9   7. A process according to any one of claims 1 to 6, characterized   not applicable where two fibrous webs of nonwoven material (5, 8) are used, at least one of them has a monochromatic pattern while at least only a part of the surface of the Another tablecloth is provided with a pattern by printing.   8. A process according to any of claims 1-7, characterized   in that the monochrome surface of one of the layers of fibers is   coated with a colored layer (6, 15) applied by casting.   9. A process according to claim 8, characterized in that one can print an additional decorative pattern (7 ') on the layer   monochrome (15) applied by casting.   10. A process according to any one of claims 1 to 9, characterized   characterized in that a material which, during pressing, does not bind or weakly binds to the thermoplastic synthetic resin is used as the coating layer, said coating layer being   removed during assembly of the ski element to form the ski.   11. A process according to claim 10, characterized in that this covering layer (13) is formed of a synthetic fiber fabric,   optionally a polyamide fabric.   12. Process according to any one of Claims 1 to 11,   characterized in that the second layer of synthetic synthetic resin   (14, 18) is first applied to the back of a coating layer   (13, 17), the assembly thus obtained in the form of a partial composite (11, 16) being then applied to the stack of layers previously formed.