EP1072293B1 - Snowboard with fabric reinforced element - Google Patents

Abstract

A ski or snowboard with a sole (4), covering skin (10) and inner reinforcing fibres, has at least one outer layer of fibres (8, 12) made from at least two different types of bulked composite fibre, including reinforcing and adhesion fibres. The reinforcing fibres can be of carbon, glass or plastic, and can form the texturised weft yarns of a woven fabric.

Description

The present invention relates to a snowboard on snow comprising a textile reinforcing element. This is for example a ski, a monoski, a surf, etc.

A snowboard on snow usually has a lower set with a sole and possibly edges as well than a reinforcing element which can be fibrous or metallic. On this lower set is placed a rigid core that can be realized in various materials. At the height of this core are possibly found on the side edges of the gliding board, reinforcing elements called songs. Finally, an upper assembly comprising a layer of fibrous or metallic reinforcement and an outer leaf complements the structure of this gliding board.

The present invention relates more particularly to boards gliding on snow for which the reinforcements used are textile reinforcements.

The textile reinforcements used generally comprise a tablecloth yarns extending in a direction and a web of yarns extending into another direction. These two directions may be perpendicular but they can also have between them an angle different from 90 °. The threads used in this textile reinforcement are generally, but not exclusively, made from glass fibers. There are solutions for directly bonding a sheet of glass fiber-based yarns to a glide board core. However, we get a better collage when a polyester interface is placed between the layers of threads and the core. This polyester veil is for example a nonwoven which is assembled reinforcement plies by binding or sewing.

A disadvantage of these textile reinforcements is their complexity which involves a relatively high cost price. Moreover, when the reinforcement is glued and that the structure of the gliding board is solicited mechanically, we can cause delamination at the interface between the polyester and the glass or inside the non-woven layer in polyester.

US-A-5 584 496 discloses a gliding board comprising composite ropes composed of fibers of different natures.

The purpose of the present invention is therefore to provide a board of slide on snow according to the features of claim 1. Advantageously, such a board includes at least one textile reinforcement fixed by gluing on a core or other rigid elements such as a metal reinforcement by example, in which the structure of the textile reinforcement is simplified in order to reduce the cost. Advantageously, this textile reinforcement will present, at equal performance, a lower density than known textile reinforcements. This textile reinforcement will preferably have a better adhesion to the core, or other rigid element, of the gliding board in order to avoid the delamination problems.

For this purpose, the snowboarding board that she proposes is a board comprising at least one fibrous reinforcement.

According to the invention, at least one fibrous reinforcement less on an outer face of compound composite voluminous yarns at least two fibers of different natures.

A voluminized wire is a wire that has been made in such a way that it a relatively large volume in relation to the volume of fibers that constitute it. During its manufacture, we gave the swelling to this thread.

The bonding of glass fabrics, especially on small surfaces porous, is very delicate. Indeed, the glass retains little glue resin at the moment of its impregnation on the one hand and during the operation of bonding itself, under the combined effect of temperature and pressure, the bonding resin becomes fluid and is removed by spinning on the other hand. These two phenomena are unfavorable to the quality of the bonding. It is known, as indicated above, to circumvent these problems by interposing between the glass fabric and the surface to reinforce a nonwoven which constitutes a reserve of glue thanks to its faculties absorption which are much better than those of glass. The invention to it, proposes another solution which makes it possible to avoid this intermediate of expensive and heavy bonding by the fact that the glue reserve is obtained directly by the voluminization of wires. Resin nesting nests are thus produced which make it possible to obtain good qualities of collage by removing the synthetic intermediate layer. By the way removal of the latter, the effects of shear and damping provided by it are also removed and the board slides as well obtained is less amortized and more lively.

The voluminized yarns preferably contain reinforcement and adhesion fibers. In this way, the voluminized wires on the one hand allow a good collage by their structure and by their composition and on the other hand have good mechanical strength thanks to the reinforcing fibers.

The reinforcing fibers of the voluminized yarns are, for example, glass, carbon or aramid while adhesion fibers are as for them for example polyester. The presence of polyester in the son, and having voluminized wires, can achieve a good bonding by obtaining a good adhesion and a good grip. other fibers can be used. Those indicated above allow however to obtain a good mechanical resistance for a cost price acceptable.

In a preferred embodiment, the voluminized wires of the fiber reinforcement are composed of glass fibers and polyester fibers, the proportion of polyester fibers being at least 15% on the surface.

The voluminized threads are woven and constitute the weft threads fabric obtained in a preferred embodiment.

The voluminized yarns are, for example, textured yarns obtained by simultaneous texturing of a reinforcing thread and a polyester thread. This method of obtaining voluminized wire is well adapted for the wire obtained serve as a reservoir for the glue used and makes a good snap on the core or other rigid element.

To allow to have a good mechanical resistance in two directions, a fibrous reinforcement advantageously comprises, besides a web of composite voluminous threads, a second ply of reinforcing threads. This second sheet of son comprises for example aligned rovings son parallel to each other. It can be connected to the wire cloth voluminized by binding.

The threads of the second ply can be made from fibers selected from the group consisting of glass fibers, carbon and aramid fibers. Of course, this list is not comprehensive.

Figure 1 est une vue en coupe transversale d'un ski selon l'invention,

Figure 2 est une vue en perspective d'une pièce de renfort utilisée dans le ski de la figure 1, et

Figure 3 est une vue en coupe à travers le renfort textile de la figure 2.

In any case, the invention will be better understood with the aid of the description which follows, with reference to the appended schematic drawing, representing by way of nonlimiting example a preferred embodiment of a textile reinforcement for a gliding board. on snow and a ski equipped with such a reinforcement.

FIG. 1 is a cross-sectional view of a ski according to the invention,

FIG. 2 is a perspective view of a reinforcement piece used in the ski of FIG. 1, and

Figure 3 is a sectional view through the textile reinforcement of Figure 2.

FIG. 1 is a cross-sectional view of a ski 2. recognize in this figure a lower assembly comprising a sole 4, edges 6 and a lower reinforcement 8. This ski also comprises a shell 10, a metal upper reinforcement 13 and an upper reinforcement 12 fibrous. The lower reinforcements 8 and upper 12 are textile reinforcements glued with an epoxy resin on a core 14. These reinforcements are described in more detail below.

Each reinforcement 8, 12 is a textile comprising on the one hand a layer of fabric 16 and secondly a ply 18 of rovings son. Layer of fabric 16 and the ply of threads 18 are connected by means of a binding thread 20. The cloth layer 16 is intended to come against either the core 14 or against the metal reinforcement 13.

The fabric layer 16 comprises warp yarns 22 and threads frame 24

The warp yarns are for example made using fiber from glass and are silionne threads of 34 tex.

The weft yarns 24 are bicomponent and textured yarns, obtained by simultaneous texturing of a glass roving wire of 200 tex and polyester thread of 110 tex. This gives a textured glass / polyester thread of 350 tex.

These weft yarns 24 are woven with the warp yarns 22 and the resulting fabric has a weight per unit area of about 80 g / m ² . FIG. 2 represents a weave in which each weft yarn 24 passes successively under a warp yarn 22 and then on a warp yarn 22, etc. We can of course have a different weave. The warp threads 22 are preferably spaced apart from each other. Their main function is to ensure the cohesion between the weft yarns 24.

The ply 18 of rovings son consists of son rovings of glass of 1200 tex arranged next to each other to form a sheet with a density of 720 g / m ² . These rovings son extend in the same direction as the warp son 22 of the fabric layer 16.

The fabric layer 16 and the ply 18 of rovings are assembled by binding. This binding operation can be performed at the same time time as the weaving of the cloth layer 16.

The weft yarns 24 fulfill the interface function during the bonding reinforcements 8, 12 on the core 14 and on the metal reinforcement 13. for example comprises 50% polyester surface. It is estimated that minimal polyester proportion to allow good adhesion is 15% on the surface. The fact that the weft yarns 24 are voluminized allows to have a good attachment of the layer of fabric 16 on the core 14 and the metal reinforcement 13. In addition, this allows the fabric layer 16 to act as a reservoir for the glue, for example epoxy resin.

Advantageously, the rovings son of the sheet 18 are arranged longitudinally in the ski 2. The weft son 24 are then arranged in the transverse direction. However, another provision is possible. The angle between the rovings son of the ply 18 and the weft son 24 is not necessarily a right angle. Another angle is conceivable, for example 60 or 120 °. However, care should be taken to have a provision of reinforcing threads of the ply 18 and the symmetrical fabric layer 16 by relative to the longitudinal axis of the ski 2.

The reinforcement fabrics of the prior art comprised three layers: a first layer of rovings son equivalent to the tablecloth 18 described above, a fabric whose weft threads are rovings threads for to ensure a good resistance and whose son of chain are son to keep in place the weft threads, and a nonwoven web in polyester. With respect to this solution, the textile reinforcement described above has, for identical mechanical strength, a lower surface density and a lower cost price. Indeed, less polyester is needed to achieve the reinforcement of a ski according to the invention. In addition, since we only have two layers, the production process is simplified. The The cost reduction is also due to a saving on raw materials, mainly polyester, but also on the resin epoxy thanks to a smaller glue reserve while remaining sufficient to ensure a good bond.

With the reinforcing fabric of the prior art mentioned above, delamination problems appear when the ski is heavily stressed. This phenomenon appears in the non-woven polyester fleece. With the reinforcement used in the ski according to the invention, the risks of delamination are strongly limited. Reinforcements are better glued on the core and the limit of Ski resistance, which has been limited by the polyester web, is repelled.

The invention thus makes it possible to obtain a more resistant ski. Of same, the advantages of the reinforcement shown in the drawing described above make that the ski according to the invention is a ski lighter and more responsive.

Another advantage of a ski according to the invention is that the reinforcements fibrous lower 8 and upper 12 are less hydrophilic than reinforcements of the prior art comprising a nonwoven. So there is less risk that water penetrates inside the ski and comes, by freezing, damaging ski.

It goes without saying that the invention is not limited to the form of embodiment described above by way of non-limiting example; she on the contrary, embraces all the variants in the context of claims below.

Thus for example the invention does not apply only to a ski but can also apply to a monoski, a snowboard, etc.

The reinforcing textile has been described by way of example. He ... not not necessarily a layer of fabric. Voluminized wires used could be simply laid out in sheet as well as the wires of glass rovings described above.

The reinforcing fibers may be glass fibers but other materials are possible. We can think of carbon fibers, aramid fibers (known as Kevlar), or other fibers known for their mechanical strength. It is even possible to use reinforcing fibers of a different nature in a same ski, even in the same voluminized wire. We could for example have a ski area in which the reinforcing fibers used would be fiberglass, another area in which there would be fibers of carbon and a third zone reinforced with aramid fibers. We can also have in the same wire a mixture of fibers for example of glass fiber and carbon fiber.

The reinforcing textile described has two layers. Generally, for a ski, we are actually looking for a reinforcement in two directions. However, we would not go beyond the scope of the invention using only one layer of reinforcement. This layer would then include voluminized wires made from polyester and reinforcing fibers. Similarly, we can also consider to use a reinforcement having more than two layers of reinforcing fibers.

Numerical data was given as an example to illustrate the invention. These data may vary in a very wide range depending on the desired mechanical characteristics.

Claims (11)

1. Snowboard comprising at least one fibrous reinforcement (8, 12), in which at least one fibrous reinforcement (8, 12) comprises, at least on one outer face, composite yarns (24) composed of at least two fibres of different type, characterized in that such yarns (24) have been produced in such a way that they have a relatively high volume relative to the volume of the fibres that they contain, and in that, during their manufacture, the yarns have been bulked.
2. Snowboard according to Claim 1, characterized in that the bulked yarns contain reinforcement fibres and adhesion fibres.
3. Snowboard according to Claim 2, characterized in that the reinforcement fibres of the said yarns are produced from at least one of the materials of the set comprising glass, carbon and aramid.
4. Snowboard according to Claim 2 or 3, characterized in that the adhesion fibres of the said yarns are made of polyester.
5. Snowboard according to Claim 4, characterized in that the said yarns of the fibrous reinforcement (8, 12) are composed of glass fibres and polyester fibres, the proportion of polyester fibres on the surface being at least 15%.
6. Snowboard according to one of Claims 1 to 5, characterized in that the said yarns are woven and constitute the weft yarns (24) of the fabric obtained.
7. Snowboard according to one of Claims 1 to 6, characterized in that the said yarns are textured yarns obtained by simultaneously texturing a reinforcement yarn and a polyester yarn.
8. Snowboard according to one of Claims 1 to 7, characterized in that a fibrous reinforcement (8, 12) comprises, in addition to a web (16) of the said composite yarns, a second web (18) of reinforcement yarns.
9. Snowboard according to Claim 8, characterized in that the second web (18) of yarns comprises rovings that are aligned parallel to one another.
10. Snowboard according to either of Claims 8 and 9, characterized in that the second web (18) of yarns is linked to the web (16) of the said composite yarns by bonding.
11. Snowboard according to one of Claims 8 to 10, characterized in that the yarns of the second web (18) are produced from fibres chosen from the set comprising glass fibres, carbon fibres and aramid fibres.

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