EP1072293A1 - Snowboard with fabric reinforced element - Google Patents

Abstract

This board for gliding on snow has at least one fibrous reinforcement (8,12) which comprises at least on one outer face of the composite voluminized wires composed of at least two fibers of different natures.

Description

The present invention relates to a board for gliding on snow comprising a textile reinforcement element. For example, it’s a ski, a monoski, a surf, etc.

Snowboarding generally has a lower set with a sole and possibly edges, as well a reinforcing element which can be fibrous or metallic. On this lower assembly is placed a rigid core which can be realized in various materials. At the height of this nucleus are possibly 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 sheet completes the structure of this board.

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

The textile reinforcements used generally include a ply of wires extending in one direction and a web of wires extending in another direction. These two directions can be perpendicular but they can also have an angle other than 90 ° between them. 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 yarn to a gliding board core. However, better bonding is obtained. when a polyester interface is placed between the plies of yarn and the core. This polyester veil is for example a nonwoven which is assembled to the reinforcement plies by tying or sewing.

A disadvantage of these textile reinforcements is their complexity which implies a relatively high cost price. In addition, when the reinforcement is glued and the structure of the gliding board is stressed mechanically, delamination can be caused at the interface between polyester and glass or even inside the non-woven layer polyester.

The present invention therefore aims to provide a board slides on snow comprising at least one textile reinforcement fixed by bonding 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, lower density than known textile reinforcements. This textile reinforcement will preferably have better adhesion to the core, or other rigid element, of the gliding board in order to avoid delamination problems.

To this end, the snow gliding board it offers is a board comprising at least one fibrous reinforcement.

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

A volumized wire is a wire which has been made in such a way that it has a relatively large volume compared to the volume of fibers that make it up. During its manufacture, some bulking was given to this thread.

Bonding of glass fabrics, especially on thin surfaces porous, is very delicate. Indeed, the glass retains little bonding resin at the time of its impregnation on the one hand and during the operation of bonding proper, under the combined effect of temperature and pressure, the bonding resin becomes more fluid and is expelled by the spin effect on the other hand. These two phenomena are detrimental to the quality of the collage. It is known, as indicated above, to bypass these problems in sandwiching between the glass cloth and the surface to be reinforced a non-woven which constitutes a glue reserve thanks to its faculties which are much better than those of glass. The invention as to her, proposes another solution which makes it possible to avoid this intermediary of expensive and heavy bonding due to the fact that the glue reserve is obtained directly by the volumization of threads. Resin hanging nests bonding are thus carried out which make it possible to obtain good qualities of bonding by removing the synthetic intermediate layer. By the removal of the latter, shearing and damping effects provided by it are also deleted and the gliding board as well obtained is less damped and more lively.

The volumized yarns preferably contain fibers of reinforcement and adhesion fibers. In this way, the bulky yarns on the one hand allow a good bonding 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 volumized yarns are for example in glass, carbon or aramid while the adhesion fibers are as for example in polyester. The presence of polyester in yarns, and having bulky yarns, makes it possible to achieve a good bonding by obtaining good adhesion and good adhesion. Others fibers can be used. Those indicated above allow however to obtain good mechanical resistance for a cost price acceptable.

In a preferred embodiment, the bulky yarns of the fibrous reinforcements are composed of glass fibers and polyester fibers, the proportion of polyester fibers being at least 15% on the surface.

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

The volumized yarns are for example textured yarns obtained by simultaneous texturing of a reinforcing thread and a polyester thread. This - process for obtaining volumized yarn is well suited for the yarn obtained serve as a reservoir for the glue used and provides good adhesion to the core or other rigid element.

To allow good mechanical resistance in two directions, a fibrous reinforcement advantageously comprises, in addition to a sheet of composite voluminized threads, a second layer of reinforcing threads. This second layer of threads includes, for example, rovings threads aligned parallel to each other. It can be connected to the wire table bulky by tying.

The threads of the second layer can be made from fibers chosen from the group comprising glass fibers, carbon and aramid fibers. Of course, this list is not exhaustive.

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.

Anyway, 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 as well as a ski equipped with such 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.

Figure 1 is a cross-sectional view of a ski 2. On recognizes in this figure a lower assembly comprising a sole 4, edges 6 and a lower reinforcement 8. This ski also has a shell 10, a metal upper reinforcement 13 and an upper reinforcement 12 fibrous. The lower 8 and upper 12 reinforcements are textile reinforcements bonded with an epoxy resin to 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 layer 18 of rovings son. Layer of fabric 16 and the ply of threads 18 are connected by means of a binding thread 20. The layer of fabric 16 is intended to come either against the core 14 or against the metal reinforcement 13.

The fabric layer 16 comprises warp threads 22 and threads weft 24.

The chain son are for example made using fibers of glass and are silionne threads of 34 tex.

The weft threads 24 are two-component and textured threads, obtained by simultaneous texturing of a roving glass yarn of 200 tex and a polyester thread of 110 tex. This gives a textured glass / polyester yarn 350 tex.

These weft threads 24 are woven with the warp threads 22 and the fabric obtained at a surface mass of approximately 80 g / m ² . FIG. 2 represents a weaving in which each weft thread 24 passes successively under a warp thread 22 then on a warp thread 22, etc. We can of course have a different weaving. The chain threads 22 are preferably fairly spaced from each other. Their main function is to ensure cohesion between the weft yarns 24.

The ply 18 of rovings son consists of rovings of glass of 1200 tex son arranged next to each other to form a ply 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 layer of fabric 16 and the sheet 18 of rovings are assembled by binding. This binding operation can be carried out at the same time time for weaving the fabric layer 16.

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

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

Reinforcement fabrics of the prior art included three layers: a first layer of rovings son equivalent to ply 18 described above, a fabric whose weft threads are rovings threads for ensure good resistance and whose chain threads are threads to hold the weft threads in place, and a non-woven veil in polyester. Compared to this solution, the textile reinforcement described above has, for an identical mechanical resistance, a lower areal mass and a lower cost price. Less polyester is needed to make the reinforcement of a ski according to the invention. Furthermore, since there are only two layers, the production process is simplified. The cost reduction is also due to savings on raw materials, mainly polyester, but also on resin epoxy thanks to a lower glue reserve while remaining sufficient to ensure good bonding.

With the reinforcement fabric of the prior art mentioned above, delamination problems appear when the ski is heavily stressed. This phenomenon appears at the level of the polyester nonwoven veil. With the reinforcement used in the ski according to the invention, the risks of delamination are strongly limited. The reinforcements are better glued to the core and the limit of resistance of the ski, which was limited by the polyester veil, is repelled.

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

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

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

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

The reinforcing textile has been described by way of example. He ... not does not necessarily have a layer of fabric. Bulky yarns used could be simply laid out in a tablecloth as well as the rovings glass described above.

The reinforcing fibers can be glass fibers but other materials are possible. We can especially think of carbon fibers, aramid fibers (known under the brand name Kevlar), or other fibers known for their mechanical strength. He is even possible to use reinforcing fibers of a different nature in a same ski, even in the same voluminized thread. We could for example have a ski area in which the reinforcing fibers used would be fiberglass, another area where we would have fiberglass carbon and a third zone reinforced with aramid fibers. We can also have in the same yarn a mixture of fibers for example of glass fibers and carbon fibers.

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

Numerical data has been given as an example to illustrate the invention. These data can vary within a very wide range range depending on the mechanical characteristics sought.

Claims (11)

Snowboard with at least one reinforcement fibrous (8,12), characterized in that at least one fibrous reinforcement (8,12) has at least one outer surface of composite bulky yarns composed of at least two fibers of different natures. Gliding board according to claim 1, characterized in that the volumized yarn contains reinforcing fibers and fibers grip. Snow gliding board according to claim 2, characterized in that the reinforcing fibers of the volumized yarns are made from at least one of the materials in the set comprising the glass, carbon and aramid. Snow gliding board according to claim 2 or 3, characterized in that the adhesion fibers of the volumized yarns are in polyester. Gliding board according to claim 4, characterized in that the voluminized threads of the fibrous reinforcement (8,12) are composed of fibers glass and polyester fibers, the proportion of polyester fibers being at least 15% in area. Snow gliding board according to one of claims 1 to 5, characterized in that the volumized yarns are woven and constitute the weft threads (24) of the fabric obtained. Snow gliding board according to one of claims 1 to 6, characterized in that the volumized yarns are textured yarns obtained by simultaneous texturing of a reinforcing thread and a polyester thread. Snow gliding board according to one of claims 1 to 7, characterized in that a fibrous reinforcement (8,12) comprises, in addition to a ply (16) of composite bulky yarn, a second ply (18) of yarn reinforcement. Snow gliding board according to claim 8, characterized in that the second ply (18) of wires comprises wires rovings aligned parallel to each other. Snow gliding board according to one of claims 8 or 9, characterized in that the second ply (18) of wires is connected to the ply (16) of threads voluminized by binding. Snow gliding board according to one of claims 8 to 10, characterized in that the threads of the second ply (18) are made from fibers chosen from the group comprising glass fibers, carbon fibers and aramid fibers.

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