EP2210649A1 - Snow gliding board with reinforcement fiber from linen - Google Patents

Abstract

The board has a longitudinal and central core arranged between upper and lower assemblies, respectively, formed of an outer protection layer and a slider. The assemblies comprise respective longitudinal reinforcements, where each reinforcement has a textile structure that contains high tenacity synthetic linen fibers. The linen fibers are threaded within longitudinal linen yarns (23), where average distance (d) separating the yarns ranges from 0.5 mm to 2.5 mm. The yarns cover 20 to 80 percent of a surface of a zone extended from a surface area of 10 square cm of the reinforcement.

Description

FIELD OF THE INVENTION

The present invention relates to the field of snow sliding sports, such as downhill skiing, cross-country skiing or surfing. More specifically, it relates to a board for gliding on snow.

PRIOR TECHNIQUES

Conventionally, a snow-sliding board has an internal structure which defines its mechanical behavior and which comprises a longitudinal core, as well as one or more reinforcements, for example a lower reinforcement and an upper reinforcement disposed on either side of this core. The internal structure of the gliding board is protected by being covered. Generally, its underside and its top are respectively coated with a gliding sole and a protective upper layer, which is apparent and generally decorative.

The reinforcements of snow sliding boards are often made of composite materials and comprise a textile structure embedded in a matrix of hardened polymer. The fibers of the textile structure may be glass, carbon and / or aramid, that is to say, be synthetic. The European patent application EP-2,000 180 also proposed that the reinforcing textile structure in a gliding or rolling board comprises natural fibers.

The Applicant is interested in the use of flax fibers in reinforcements with textile structure and matrix constituting gliding boards. Indeed, the use of flax fibers is a response well adapted to the ever greater demands in respect of the environment. In addition, flax fibers have high mechanical tensile properties while being lightweight.

However, flax fibers do not behave like synthetic fibers, so that simply replacing them is often not possible in order to achieve the desired result. However, the mechanical behavior and properties that are required of a board snow slide are very specific.

SUMMARY OF THE INVENTION

The purpose of the invention is at least to allow the use of flax fibers in snowboard gliding reinforcements in a manner that is compatible with the specific requirements as to the mechanical behavior and properties of a snowboard. slips on snow must present.

• ■ une semelle de glisse constitutive d'un ensemble inférieur,
• ■ une couche supérieure de protection constitutive d'un ensemble supérieur, et
• ■ un noyau se trouvant entre les ensembles inférieur et supérieur.

According to the invention, this object is achieved by means of a board for gliding on snow, comprising:

• ■ a gliding base forming a lower assembly,
• A protective upper layer constituting an upper assembly, and
• ■ a kernel between the lower and upper sets.

At least one of the lower and upper sets comprises a reinforcement which comprises a textile structure including flax fibers. At least a portion of the flax fibers are spun into oriented yarns of at least a first group of yarns substantially parallel to each other that comprises said reinforcement. At least at a zone extending over at least 10 cm ² of the reinforcement, the flax-based yarns of said first group cover 20% to 80% of the area of said zone.

When the flax fibers are integrated son not covering the entire surface of the reinforcement, it achieves optimal damping of the gliding board. Indeed, the flax fibers are in such a quantity that, because of their intrinsic damping properties compared to the glass fibers, they improve the damping behavior of the gliding board, without also producing excessive damping which would degrade the general mechanical behavior of the board when used on snow.

Advantageously, at least at the level of the zone extending over at least 10 cm ² of the reinforcement, the flax-based yarns of said first group cover 40% to 60% of the area of this zone.

Advantageously, at least at the level of the zone extending over at least 10 cm ² of the reinforcement, there are several elongate spaces, each of which separates one of the two consecutive yarns from the flax-based yarns of said first group. .

Advantageously, the reinforcement comprises a second group of oriented son, which extend in the same direction non-parallel to the oriented son of said first group.

Advantageously, another portion of the flax fibers are spun into the oriented threads of said second group.

Advantageously, the oriented threads of said first group form a first layer, the oriented threads of said second group forming a second layer, the first and second layers being superimposed.

Advantageously, at least the flax-based threads of said first group are attached to a support ply.

Advantageously, links at least connect the flax-based threads of said first group to the support ply.

Advantageously, the flax-based threads of said first group are embedded in a transparent or translucent matrix.

Advantageously, the reinforcement is visible through a transparent or translucent layer among the sole and the upper protective layer.

Advantageously, the reinforcement comprises synthetic fibers of high tenacity.

Advantageously, the son of said first group extend in a longitudinal direction of the gliding board on snow.

BRIEF DESCRIPTION OF THE FIGURES

• la figure 1 est une vue en perspective d'une planche de ski conforme à l'invention ;
• la figure 2 est une coupe schématique et transversale, selon le plan II de la figure 1 ;
• la figure 3 est une vue schématique, en perspective, d'une portion d'une structure textile que comprend un renfort de la planche de ski des figures 1 et 2 ;
• la figure 4 est une vue schématique, en perspective, d'une portion d'un fil de la structure textile de la figure 3, les fibres d'une extrémité de cette portion étant désunis dans un but illustratif ; et
• la figure 5 est une vue agrandie, de dessus, de la portion désignée par le chiffre V à la figure 1.

The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, among which:

• the figure 1 is a perspective view of a ski board according to the invention;
• the figure 2 is a schematic cross section, according to plan II of the figure 1 ;
• the figure 3 is a schematic view, in perspective, of a portion of a textile structure that includes a reinforcement of the ski board of Figures 1 and 2 ;
• the figure 4 is a schematic view, in perspective, of a portion of a thread of the textile structure of the figure 3 the fibers of one end of this portion being disunited for illustrative purposes; and
• the figure 5 is an enlarged view, from above, of the portion designated by the number V at the figure 1 .

POSSIBLE MANNER OF REALIZING THE INVENTION

On the figure 1 is represented a snowboarding board on snow, which is more specifically an alpine skiboard 1 and whose longitudinal axis is referenced X-X ' . From its rear heel 2 to its front spatula 3, this ski board 1 has a bottom 4 and a top 5, each of which connects two side edges 6 of the board 1. At a distance from the heel 2 and the spatula 3, the top 5 is intended to receive a coupling attachment of a ski boot, this binding being known in itself and not shown for the sake of clarity.

As can be seen at figure 2 , the ski board 1 comprises a central and longitudinal core 10, which may be made of expanded polyurethane foam and which separates a lower assembly from an upper assembly.

Among the elements of the lower set of the ski board 1, there are two side edges 11 and a gliding sole 12, which connects these two opposite edges to one another and which can be made of polyethylene, in particular in translucent polyethylene. The upper assembly of the ski board 1 comprises an outer protective layer 13, which is transparent and may in particular be made of a thermoplastic material based on polyurethane (PU) or an Acrylonitrile Butadiene Styrene Copolymer (ABS). This protective layer 13 may or may not receive one or more decors on at least a portion of its lower main face and / or on at least a portion of its upper main face. In the example shown, two side edges 14 laterally close the envelope containing and protecting the internal structure of the board 1, in particular its core 10.

The ski board 1 contains one or more reinforcements, such as longitudinal reinforcements. In the example shown, these longitudinal reinforcements are in number two and are separated by the core 10, to the extent that one, referenced 15, of them belongs to the lower set, while the other reinforcement 16 is constitutive of the upper set.

In the example shown, these two longitudinal reinforcements 15 and 16 have the same constitution, according to which a textile structure is embedded in a mechanizing matrix, such as a transparent epoxy matrix or a polyurethane (PU) matrix.

A sample of the textile structure 20 forming the longitudinal reinforcements 15 and 16 is shown alone in FIG. figure 3 . The textile structure 20 comprises a support ply 21, which may be a fiberglass or polyester nonwoven, and to which polyester bonding yarns or sewn-in bonds 22 join reinforcing yarns, i.e. longitudinal warp yarns 23 and transverse weft yarns 24. The longitudinal yarns 23 form a layer. The transverse yarns 24 form another layer, which is located between the support ply 21 and the longitudinal yarn layer 23.

As can be seen at figure 4 wherein there is shown a length of longitudinal wire 23, each wire 23 is made of fibers 25, which are spun together so as to have a twisted structure. The fibers 25 are all flax fibers in the example shown.

In the example shown, each transverse wire 24 is a high tenacity filament made of glass. However, all or part of the transverse son 24 may have the same constitution as the longitudinal son 23 and include flax fibers spun together.

The protective layer 13 is made of a transparent material, through which the non-transparent elements of the upper reinforcement 16 are visible, as can be seen in FIG. figure 5 . The matrix of this reinforcement 16 is transparent and the transverse glass son 24 are also once they are embedded in this matrix. Also, through the protective layer 13, only clearly distinguished longitudinal son 23, the links 22 can be perceived visually by means of careful examination.

The longitudinal threads 23 run alongside each other and are laterally offset from one another in a transverse direction of the reinforcement 16. They extend in a direction same surface and overall in the same direction, namely the direction X-X ', succeeding transversely to their longitudinal direction. Most of them are disjoint, insofar as there are longitudinal spaces 26 each of which is devoid of reinforcing fibers, being filled only with resin of the matrix, and separates from one another two wires 23 consecutive. Alternatively, synthetic reinforcing elements, such as son or continuous filaments of glass, carbon or aramid, may extend into the longitudinal spaces 26 where, even in this case, the yarns 23 are absent.

The average width of the longitudinal spaces 26, that is to say the average distance d separating two longitudinal son 23 consecutive from each other, is advantageously between 0.5 mm and 2.5 mm. The longitudinal threads 23 have a mean diameter or width ℓ advantageously between 0.5 mm and 2.5 mm. The average number of longitudinal threads 23 is preferably between 2 and 6 threads per centimeter in the transverse direction, that is to say in those directions of the reinforcement which is perpendicular to the longitudinal direction X-X ' of the threads 23. The average grammage of the yarns 23 is advantageously between 100 and 500 g / m ² . For example, it may be of the order of 200g / m ^2, whereas the basis weight would have a value greater than 500 g / m ² if the son 23 were fused contiguously.

The average values mentioned above are measured on a reinforcement portion large enough for these average values to be significant. For example, the widths d and ℓ averages, as well as the average number of longitudinal threads 23, can be measured over a distance of about 5 cm in the direction perpendicular to the threads 23. The average grammage of the threads 23 can be measured on a surface of about 10 cm ² .

It follows from the above that the longitudinal son 23 cover only a portion of the extension of the reinforcement 16 to obtain optimum damping of the gliding board. On all or part of this reinforcement 16, preferably on its major part, the longitudinal threads 23 cover from 20% to 80% of the extension of the reinforcement 16, preferably from 40% to 60% of this extent, for example the order of 50% of the extension of the reinforcement 16.

The configuration described above makes it possible to obtain that, despite the use of substantial amount of flax fibers in the reinforcements 15 and 16, the ski board 1 has the desired mechanical behavior, especially in terms of bending stiffness and damping.

In addition, the spacing of the son 23 allows that the damping provided by the flax fibers is distributed in width, for example over the entire width of the gliding board or at least over most of this width.

It should also be noted that, if they were all contiguous, the longitudinal son 23 would be perceived visually, through the protective layer 13, as a dark mass in one piece. Due to the presence of the spaces 26, the longitudinal son 23 together form a pattern of parallel bars which succeed each other being offset with each other in the width direction of the ski board 1, which produces an undeniable aesthetic effect.

The longitudinal threads 23 may all be disjoint. On the figure 5 , some are joined, being held together by the same seam 22. This may not be wanted without being crippling. Nevertheless, it is also deliberate to make the longitudinal threads grouped by two or three or more.

As indicated above, the lower reinforcement 15 may have a structure similar to the upper reinforcement 16, in which case its longitudinal threads 23 are visible through the sole 12 and form a bar pattern on the underside 4 of the ski board 1, therefore that the sole 12 is translucent. In an equally interesting variant, only the upper reinforcement 16 of the two reinforcements 15 and 16 has the structure described above, the lower reinforcement 15 having a conventional design in which the reinforcing fibers are synthetic fibers of high tenacity.

The invention is not limited to the embodiment described above. In particular, one of the reinforcements 15 and 16 may have a structure different from that described above, for example a structure of the type currently used. One or each of the reinforcements 15 and 16 could also comprise one or more layers of reinforcing glass fibers or other high tenacity synthetic fibers, positioned above and / or below the layer including flax yarns, to reinforce the gliding board sufficiently in flexion.

Furthermore, the longitudinal son of linen 23 could be arranged over the entire width of the gliding board, and not only a portion of this width.

In addition, the linen reinforcing son could be oriented with an angular offset with respect to the longitudinal axis X-X ' of the gliding board. For example, some of them could be turned clockwise by a positive angle of 30 ° or 45 ° to the longitudinal axis X-X ' , while another part of Linen reinforcement yarns would then be tilted at the same angle or at another angle, but counterclockwise, for example -30 ° or -45 °, with respect to the longitudinal axis XX ' .

In addition, at least one of the reinforcements 15 and 16 may extend over the entire length of the gliding board or only cover one or more localized areas of short length, so as to damp more specifically certain modes of vibration of the gliding board.

Claims (12)

Board sliding on snow, including: A gliding sole (12) constituting a lower assembly, An upper protective layer (13) constituting an upper assembly, and A core (10) located between the lower and upper assemblies, at least one of the lower and upper assemblies comprising a reinforcement (15, 16) which comprises a textile structure (20) including flax fibers, characterized in that that at least part of flax fibers (25) are spun in oriented son (23) at least a first group of substantially parallel son between them (23) that includes said reinforcement (15, 16), and in that , at least at a zone extending over at least 10 cm ² of the reinforcement (15, 16), the flax-based yarns (23) of said first group cover 20% to 80% of the surface of this area. Snow sliding board according to claim 1, characterized in that at least at the level of the zone extending over at least 10 cm ² of the reinforcement, the flax oriented yarns (23) of said first group cover 40% 60% of the surface of this area. Snow sliding board according to one of the preceding claims, characterized in that at least at the level of the zone extending over at least 10 cm ² of the reinforcement, there are several elongate spaces (26), each of which separates one of the other two consecutive yarns (23) among the flax-based yarns of said first group. Snow sliding board according to any one of the preceding claims, characterized in that the reinforcement (15, 16) comprises a second group of oriented threads (24), which extend in a same non-parallel direction to the oriented threads (23) of said first group. Snow sliding board according to claim 4, characterized in that a further portion of the flax fibers (25) are spun into the oriented yarns (24) of said second group. Snow sliding board according to claims 4 and 5, characterized in that the oriented threads (23) of said first group form a first layer, the oriented threads (24) said second group forming a second layer, the first and second layers being superimposed. Snow sliding board according to one of the preceding claims, characterized in that at least the flax oriented threads (23) of said first group are attached to a support ply (21). Snow sliding board according to claim 7, characterized in that links (22) connect at least the flax-based threads (23) of said first group to the support ply (21). Snow sliding board according to any one of the preceding claims, characterized in that the oriented strands based on flax (23) of said first group are embedded in a transparent or translucent matrix. Snow sliding board according to claim 9, characterized in that the reinforcement is visible through a transparent or translucent layer among the sole (12) and the upper protective layer (13). Snow sliding board according to any one of the preceding claims, characterized in that the reinforcement (15, 16) comprises synthetic fibers of high tenacity. Snow sliding board according to any one of the preceding claims, characterized in that the threads (23) of said first group extend in a longitudinal direction of the snow gliding board.

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