EP1493468B1 - Board for gliding sports comprising a bamboo core - Google Patents

Abstract

The bamboo core structure for snowboards and skis has an inner bamboo torsion box (4,11), which is resistant to bending and twisting and is independent of laminates. The interior of the torsion box has vertical core units (8) and longitudinal uncrushed bamboo veneers or bamboo canes cut at an angle. The inner torsion box is embedded within an outer torsion box composed of an upper (9) and a lower (3) strip, and side cheeks (7) which are of an impact resistant but pliable material.. A high tensile metal strip is around the upper edge (14) of the wood ski or board.

Description

The invention relates to a sliding board sports equipment according to the preamble of claim 1 and a manufacturing method for a Gleitbrettsportgerät according to the preamble of claim 18th

Skis and snowboards generally consist of a top chord and a bottom chord, between which a core is arranged. Depending on the construction, the core, the top and bottom chords are made of wood, or the top and bottom chords are made of laminates, such as fiberglass or carbon fiber constructions, in which case the core can also be made of an elastomeric foam. Since high rigidity and the lowest possible weight are expected of skis and snowboards, the constructions consisting of foamed, non-load-bearing cores in connection with external high-strength laminates have replaced the conventional wooden constructions in recent decades. Thus, for example, in the patent DE 4322300 C2, a ski is described, which consists of a foamed plastic core with an enveloping, supporting structure.

However, such a construction has several disadvantages. Thus, the laminated structures generally do not have good damping properties, which can lead to unpleasant vibrations during driving. Furthermore, the materials used are poor or not recyclable, so these skis and snowboards have a poor life cycle assessment. Another disadvantage is that the core has a pure filling function, ie the weight of the core increases that Total weight without the core contributing to the stability of the construction.

By Arbor Sports ("snowboards 2003 - the mystic series" [Online] XP002308598 Found on the Internet: URL: http: // web. Archive.org/web/20030618101629/www.arborsports.com/pages/snowboards_03_files/mystic_03.html> [found on 2003-06-18]) is a snowboard with a top chord of wood and a core known, which consists partly of bamboo.

FR-A-2 429 377 discloses board sports equipment partly made of bamboo.

The invention is based on the object to develop an improved Gleitbrettsportgerät, in particular a ski, a snowboard, a water ski, a wakeboard or kiteboard, with which the disadvantages of conventional Gleitbrettsportgeräte be avoided and the simplest possible production and high rigidity improved Life Cycle Assessment and improved driving characteristics.

The object is achieved with a Gleitbrettsportgerät according to claim 1 and a manufacturing method for such Gleitbrettsportgerät according to claim 17.

The invention is based on the physical knowledge that the choice of a suitable material for the core of Gleitbrettsportgerätes, such as a ski, snowboards, water skis, wakeboards or kite boards damping properties, driving characteristics and life cycle assessment can be improved.

Advantageously, therefore, the core of the Gleitbrettsportgerätes invention consists at least partially of bamboo.

Bamboo is a fast-growing, recyclable raw material that can absorb high tensile, compressive and torsional loads.

This improves both the eco-balance and the driving characteristics. Furthermore, bamboo is a low-cost material that is easy to work with. This advantageously results in an inexpensive production. In addition, since the core can already absorb load, the laminates can either be dispensed with completely, or they can be made in a smaller thickness, which further improves the LCA. By reducing or eliminating the laminate layers In addition, the total weight can be reduced.

In a ski according to the invention, the weight reduction made possible by the bamboo structure is of particular advantage, since the ski, unlike the snowboard, is connected to one leg only fixed in one place. Even a slight reduction in weight is particularly noticeable in a ski, since the mass moment of inertia of the ski around the axis of the leg which is decisive for torsional loads on the leg is disproportionately reduced.

In an advantageous embodiment of the invention, the core consists partly or wholly of bamboo slats. The bamboo slats may have a rectangular cross-section or even another cross-section, for example with six or a different number of corners. For example, the bamboo slats can be square bamboo sticks, which are installed side by side in the core and glued together. This construction has the advantage of being very easy to manufacture. In addition, the use of solid square bamboo slats achieves maximum rigidity of the core.

Preferably, the core may also or exclusively comprise angle-milled bamboo tubes. Angled milled bamboo can be made, for example, from bamboo cane with the help of a square milling machine. This results in a square bamboo rod having a cavity inside, wherein the size of the cavity is dependent on the size of the cavity of the bamboo tube used for the production. The angle-milled bamboo tubes can be arranged in the core side by side or side by side and one above the other so that a specific core cross-section is formed. The advantage here is the weight reduction due to the cavities of the angle-milled bamboo tubes. advantageously, Angularly milled bamboo tubes are used with a thickness that corresponds to the thickness of the core. This has the consequence that the cavities in the construction occur exactly where the least stress of the material is to be expected. If the angle-milled bamboo tubes are installed longitudinally next to one another in the snowboard, the ski, the water ski, the wakeboard or the kiteboard, bamboo tubes with a larger inner cavity can be arranged in the middle, since a lower load is to be expected in the middle. In this way additional weight can be saved.

Advantageously, a filler of lesser density than bamboo can be arranged in the core. This has the advantage that the weight of the core can be reduced. As a filling material known foamed plastics or natural products can be used.

Advantageously, the Gleitbrettsportgerät has a layer structure in which above and below the core, an at least partially made of bamboo inner veneer layer is arranged. This veneer layer can consist entirely or partially of square bamboo sticks, which have been glued together, for example. The veneer layers, in combination with the core, give the snowboard, the ski, the water ski, the wakeboard or the kiteboard a very high degree of rigidity, since a torsionally rigid box is created in a non-positive connection with the core. Advantageously, the veneer layers are fixed directly to the core without laminates, without a laminate layer being arranged. This has the advantage that can be dispensed with in this area on laminate layers that would deteriorate the environmental balance. If an increased rigidity of the construction is desired, but can Laminate around the core or the inner veneer layers are arranged.

Above and below the core, an upper and a lower chord are arranged according to the invention, which consist at least partially of bamboo. The upper and lower chords increase the rigidity of the construction, whereby, if required, several upper and lower chords can be arranged. Like the inner veneer layers, the upper and lower chords can also be made of a material combination of bamboo with, for example, a laminate, and a combination with other natural materials such as wood is also possible in order to increase the strength at certain points.

Advantageously, the upper and lower chords are each mounted directly on the inner veneer layer. If the inner veneer layers are mounted directly on the core, this results in a stack or sandwich construction which is free of laminates and yet highly stable.

Preferably, the bamboo of the core, the lower chord, the upper chord or the inner veneer layers is unthreaded in the longitudinal direction. The longitudinal direction refers to a direction of travel of the ski, the snowboard, the water ski, the wakeboard or the kite board. Since impact is generally difficult to transfer and thrust transfer, a bum-free construction offers the advantage of consistently high strength. However, if impacts due to structural details are necessary, they are arranged as possible staggered to ensure a continuous power transmission in the components in the longitudinal direction. To produce unpunched bottom straps, top straps, cores, or interior veneer plies, square bamboo rods or angularly milled bamboo tubes are used made of bamboo tubes whose length is greater than the length of the Gleitbrettsportgerätes to be produced.

Advantageously, side cheeks are arranged laterally of the core, which laterally cover the core or the inner veneer layers. Preferably, the top flange and the bottom flange are wider than the core with the inner veneer layers and are also non-positively connected to the side cheeks, for example glued. This creates a torsion box, which increases the rigidity of the construction. Sideways means in the longitudinal direction of Gleitbrettsportgeräts next to the core.

Preferably, vapor barriers are arranged on the core side of the side cheeks. The vapor barriers lie between the core and the sidewalls and prevent the entry of water into the core. If inner veneer layers are arranged above and below the core, the vapor barriers also advantageously cover these veneer layers in order to reliably protect the core and the veneer layers against lateral water ingress. The vapor barriers may also be bamboo, which may be specially treated to resist water. If the bamboo vapor barrier connected non-positively with the inner veneer, so advantageously creates a box that increases the torsional stiffness of the snowboard, the ski, the water ski, the wakeboard or the kite board.

In the load introduction area of a fastening device for a binding for fastening a shoe, the core advantageously has special features in order to absorb the high forces that are exerted on the binding on the sliding board sports device. Thus, the core may have wood in the load transfer area, in particular, higher-strength wood types are beneficial. For example, a massive location can Beech wood to be glued. Furthermore, the inner veneer layers, the upper or the lower flange wood may also have a force introduction. The load introduction area may, for example, each attachment device have a size of about 5 x 5 cm, but it may also be much larger, for example. Have a length of 60 cm. If the core is made of square-edged bamboo tubes, replacement of square-edged bamboo tubes with solid bamboo slats in the load-transfer area can also be advantageous, as it increases the strength in this area.

To protect the snowboard, the ski, the water ski, the wakeboard or the kite board, the upper belt can be at least partially enclosed with a metallic cover. The metallic cover can run in the region of the upper edge and, for example, consist of Titanal. Titanal has the advantage that it has a high resistance to mechanical attacks at low density.

If, according to a further variant of the invention, adjacent bamboo parts are provided in the core with alternately opposite growth directions with respect to the longitudinal direction of the sports equipment, there may be advantages for increased stability of the core structure.

In an advantageous embodiment of the invention, the bamboo of the core, the inner veneer layers, the lower chord or upper girth of the bamboo genus "Guadua angustifolia" or a similar bamboo genus. Furthermore, the bamboo used for these components preferably has a tensile strength of at least 20 kN / cm ² , 30 kN / cm ² or 40 kN / cm ² , a tensile elastic modulus of at least 2.0 MN / cm ² , 2.5 MN / cm ² or 3.2 MN / cm ² or a fiber length of at least 1 cm. A high modulus of elasticity has the advantage that the Gleitbrettsportgerät a high rigidity is awarded. A high tensile strength in turn has the advantage that the Gleitbrettsportgerät has a high strength. The higher the strength, the higher the sliding board sports equipment can be loaded. Long fibers increase the resistance and strength of the bamboo.

Preferably, the Gleitbrettsportgerät has a cover layer which is disposed above the upper flange. This cover layer protects the underlying layers against mechanical influences, such as, for example, knocks. The cover layer is preferably made at least in part from bamboo of the genus "Phyllopstachys pubescens" or a similar genus. By using bamboo in combination with a transparent protective layer, an attractive graphic design of the snowboard can be achieved.

The bamboo used for the top layer should have a Brinell hardness of at least 32 HB. The higher the Brinell hardness of the bamboo, the more resistant the top layer and thus the Gleitbrettsportgerät is against damage from impact or similar mechanical stress. The bulk density of the bamboo used is preferably at least 0.79 g / cm ³ . The higher the bulk density of the bamboo, the higher the packing density of the fibers, whereby the resistance to mechanical action is advantageously increased. Furthermore, the abrasion resistance of the cover layer is higher than 3.7. This achieves a high resistance to mechanical grinding loads.

To protect the surface of the snowboard, the ski, the water ski, the wakeboard or the kite board, a protective layer is advantageously applied, for example, to the cover layer. This protective layer may, for example, consist of a two-component lacquer or a plastic sealing system and protects the surface against moisture, mechanical effects and UV radiation. Particular advantages for the protection and the visual appearance of the surface may result if the protective layer is formed from a protective oil, in particular linseed oil. The oil-protective layer can penetrate into the material below the surface, so there is less chance of injury of deeper layers and superficial scratches can be easily corrected.

A manufacturing method for producing a Gleitbrettsportgeräts invention is an independent subject of the invention.

Fig. 1

den Aufbau eines Ski oder Snowboards unter der Verwendung von Vierkantbambusstäben für den Kern,

Fig. 2

den Aufbau eines Ski oder Snowboards unter Verwendung winkelgefräster Bambusrohre,

Fig. 3

den Aufbau eines Wasserskis, Kiteboards oder Wakeboards unter der Verwendung von Vierkantbambusstäben für den Kern, und

Fig. 4

den Aufbau eines Wasserskis, Kiteboards oder Wakeboards unter Verwendung winkelgefräster Bambusrohre.

Subsequently, the invention will be explained by way of example with reference to the two attached figures. The figures show:

Fig. 1

the construction of a ski or snowboard using square bamboo sticks for the core,

Fig. 2

the construction of a ski or snowboard using angularly milled bamboo tubes,

Fig. 3

the construction of a water ski, kite board or wakeboard using square bamboo sticks for the core, and

Fig. 4

the construction of a water ski, kite board or wakeboard using angle-milled bamboo tubes.

The bamboo used to manufacture a sliding board sports equipment according to the invention should generally have a fiber length of at least 1 cm, at a height of no more than 2000 m above sea level, have a maximum residual moisture of 10%, are stored vertically after being whipped and air-dried over a period of 4 to 6 weeks, beaten for a cool and dry season, and heavily silicified nodiums Have diaphragms.

In Fig. 1, the left side of a ski is shown in sectional view. The section runs perpendicular to the longitudinal axis (longitudinal direction) of the ski. The core of the ski shown in Figure 1 consists of bamboo slats 1 having a width of 0.5 cm, a height of 1.5 cm and a length corresponding to the length of the ski. The bamboo slats 1 are made of bamboo of the genus "Guadua angustifolia". The bamboo used to make the bamboo battens of the core should, in addition to the above features, also have at least one of the following characteristics: a tenacity of at least 40,000 m, a tensile strength of at least 40 kN / cm ² , a compressive strength of at least 93 kN / cm ^2, a modulus of elasticity under tensile load of at least 32 MN / cm ^2, a modulus of elasticity at compression stress of at least 16.5 MN / cm ^2, a modulus in flexure of at least 32.5 MN / cm ^2, a bending strength of at least 27 , 6 kN / cm ² or a shear strength of at least 2.2 kN / cm ² .

For the production of the bamboo slats of the core dried bamboo, which has a raw material length of at least 200 cm, with a circular saw, which has a double saw blade sawed in the direction of the longitudinal axis in five to eight uniform circular sections, which are then planed four-sided for further processing , The sections of the circle are planed into rectangular slats measuring about 7 cm x 3 cm x the length of the raw material. Subsequently The slats are divided horizontally so that they have a thickness of 1.5 cm. After this step, the slats along the longitudinal axis in 0.5 cm wide and 1.5 cm high strips sawed. The product of this step already corresponds to the bamboo slats 1 of the core. To compensate for material non-uniformities and for increased stability, every other one of the bamboo slats 1 is rotated so that every other slat comes to lie in a reverse growth direction with respect to the longitudinal direction of the ski. Subsequently, 30 of the adjacent bamboo slats are pressed together with a two-component adhesive under pressure to the actual approx. 15 cm x 1.5 cm x the length of the raw material long raw core. This raw core is suitable for further processing as a skier. For the production of a snowboard, however, two of these cores are glued together again under pressure. Subsequently, the resulting raw core is milled with the aid of a milling cutter so that it receives the necessary dimensions for the snowboard to be produced.

Above and below the bamboo slats 1 inner veneer layers 2, 3 are arranged. For the production of the inner veneer layers 2, 3 bamboo is used, to which the same requirements are made as to the bamboo of the core. Analogously to the production of the bamboo slats 1 of the core, to produce the inner veneer layers 2, 3, bamboo is processed into slats of 7.5 cm × 1.5 cm × the length of the raw material. For the production of the inner veneer layers 2, 3, however, the slats are sawed along the longitudinal axis in 2.5 cm wide strips. Each second of the sawed slats is in turn rotated to compensate for material non-uniformities and then crimped to a 15 cm x 1.5 cm x the length of the raw material measuring raw slab. To produce a snowboard, two of the green sheets are glued together again under pressure. From the resulting raw slabs are using a veneer saw cut veneer with a thickness of about 0.6 to 1 mm. Analogously, a top flange 4 and a bottom flange 5 are produced.

In order to produce the sandwich construction of the ski, a running surface 6 milled onto the contour of the snowboard is pressed together with contoured steel edges 7 into a shape corresponding to the outer contour of the ski. The steel edges 7 and the tread 6 are generally known in the art. On the tread 6 and the steel edges 7, an approximately 0.2 mm thick rubber layer 8 is glued, with the compound, in particular between the steel edges and the tread can be improved. The further layered structure of the ski consists of the lower flange 5, the inner veneer layer 2, the bamboo slats 1 of the core, the second inner veneer layer 3, the top flange 4 and a veneer top layer 9. The veneer top layer is produced in an analogous process as the internal veneer layers, however, bamboo of the genus "Phyllostachys pubescens" is used. The bamboo of the upper veneer layer 9 should have a Brinell hardness of at least 32 HB, a bulk density of at least 0.79 g / cm ² and be provided after processing with a protective coating. Each side of the core, a phenolic sidewall 10 is arranged. Above the phenol side cheek, a finishing edge 11 is arranged, which is adapted to the contour of the ski and consists of Titanal. Between the core and the phenol side cheek a vertical bamboo strip is installed. Like the inner veneer layer, this bamboo strip is made of bamboo veneer and serves as a vapor barrier 12. For this purpose, it is pretreated with a protective varnish.

The ski design, which is completely inserted in the contour shape, is inserted into a heatable vacuum autoclave press and there pressed with a pressure of about 5 to 10 kN / m ² . The press is heated for about one minute to a temperature of 150 ° C. At this temperature, a lasting plastic deformation is imposed on the bamboo, giving the ski its final shape. After the one-minute high-temperature phase, the press is cooled to room temperature over a period of 4 to 6 hours.

After pressing and removing the ski from the mold, sanding and milling removes any adhesive residue, sanding and waxing the tread, and treating the bamboo surface with a varnish or oil. As a protective oil, a linseed oil with the highest possible penetration capacity is used, as it is known from boat building.

In Fig. 2, another possible embodiment of the invention is shown. Also, Fig. 2 shows a sectional view of a perpendicular to the longitudinal cut ski. The components provided with the primed reference numerals correspond to those shown in Figure 1 and provided with uncoated reference numerals components, which is why this will not be discussed again here.

The difference of the ski shown in Fig. 2 compared to Fig. 1 relates to the construction of the core. The core consists of angularly milled bamboo tubes 21 and bamboo slats 1 '. The angularly milled bamboo tubes 21 are manufactured by making dried bamboo tubes of the genus "Guadua angustifolia" with a diameter of about 1.2 cm and a wall thickness of about 0.3 cm by means of a square milling machine to angularly milled bamboo tubes 21 of about 0.85 cm x 0 , 85 cm x the length of the raw material are milled. The resulting angularly milled bamboo tubes 21 then become together with the bamboo slats 1 'with a permanently elastic two-component adhesive under pressure to a raw core with the dimensions 15 cm x 1.5 cm x the length of the raw material pressed. For use as a snowboard core, two of the resulting cores are again glued together under pressure to produce a double raw core of width 30 cm. Here in the load introduction area of a binding instead of the angle-milled bamboo tubes 21 bamboo slats 1 'was installed to about 60 cm in length. The further manufacturing process corresponds to the manufacturing process described above in connection with FIG.

The result of the manufacturing process may be a bamboo construction for a snowboard and a ski of all kinds, consisting of an internal, independent of laminates, in bending and torsion resistant bamboo torsion box. The inner torsion box consists of longitudinally unpunched bamboo veneers 2, 3 and core elements 1, 1 ', 21 which are perpendicular to the inner torsion box and ideally consist of bamboo veneers 1, 1', which are unscathed in the longitudinal direction, or angularly milled bamboo tubes 21.

Furthermore, the construction may be considered to have an outer torsion box embedded in the inner torsion box and consisting of a top flange 4, a bottom flange 5 and the side cheeks 10. The top flange 3, the bottom flange 2 of the inner torsion box are ideally made of highly tensile, compressive, and torsion-loadable materials such as. In the longitudinal axis of unpunched bamboo veneer. The side cheeks 10 are made of impact resistant, but flexible materials such as phenol, ABS or hardwood.

FIG. 3 shows a further embodiment of the invention. FIG. 3 shows a sectional view of a wakeboard, the section being perpendicular to the longitudinal direction.

The components provided with the two-part reference numerals correspond to the components shown in FIG. 1 and provided with uncoated reference numerals. Like the ski shown in FIG. 1, the wakeboard shown in FIG. 3 also has a core of bamboo slats 1 ", inner veneer layers 2", 3 ", a top flange 4", a bottom flange 5 ", a running surface 6" and a cover layer 9 " ,

The tread 6 "is adapted to the requirements of water sports, in which case it is possible to use materials which are known per se from the prior art.As the illustrated wakeboard has no upper end edge, no phenolic sidewall and no steel edge, the cover layer 9" is round the edge running around so that it abuts directly on the running surface 6 "Further, the upper flange 4" is formed so that it reaches down to the lower inner veneer layer 5 ", with which it is glued Skis shown and described in FIG.

FIG. 4 shows a cross section through another embodiment of a wakeboard according to the invention. The components provided with the reference numerals correspond to those shown in Figure 3 and are provided with double-painted reference numerals. The difference of the wakeboard shown in Figure 4 compared to that shown in Figure 3 relates to the construction of the core. The core consists of angularly milled bamboo tubes 21 'and bamboo slats 1' '. The angularly milled bamboo tubes 21' are manufactured as described above in connection with FIG.

The invention is not limited to the above-mentioned embodiments, in particular snowboards can be produced in the same way as skis. The main difference consists in the larger width of the snowboards. Furthermore, according to the design principle of the kiteboard also water ski or wakeboards can be constructed.

LIST OF REFERENCE NUMBERS

1, 1 ', 1' ', 1' ''

bamboo slats

2, 2 ', 2 ", 2' ''

lower inner veneer layer

3, 3 ', 3' ', 3' ''

upper inner veneer layer

4,4 ', 4' ', 4' ''

upper chord

5, 5 ', 4 ", 4"'

lower chord

6, 6 ', 6' ', 6' ''

tread

7, 7 '

steel edges

8, 8 '

rubber sheet

9, 9 '

topcoat

10, 10 '

Phenol side cheek

11, 11 '

terminal edge

12, 12 '

vapor barrier

21, 21 '

angle-milled bamboo tubes

Claims (21)

1. Board for gliding sports, in particular ski, snowboard, water ski, wakeboard or kiteboard, having a core (1, 1', 1'', 1"', 21, 21'), which comprises bamboo at least partially, and having an upper belt (4, 4', 4", 4''') which is disposed above the core (1, 1', 1'', 1''', 21, 21'), characterised by a lower belt (5, 5', 5", 5''') which is disposed below the core (1, 1', 1'', 1''', 21, 21'), the upper belt (4, 4', 4", 4''') and the lower belt (5, 5', 5'', 5''') comprising bamboo at least partially.
2. Board for gliding sports according to claim 1, characterised in that the core (1, 1', 1'', 1''', 21, 21') includes bamboo slats (1, 1', 1'', 1''').
3. Board for gliding sports according to claim 1 or 2, characterised in that the core (1, 1', 1'', 1''', 21, 21') includes angularly-milled bamboo canes (21, 21').
4. Board for gliding sports according to one of the preceding claims, characterised in that the core (1, 1', 1", 1''', 21, 21') contains a filler material of a lesser density than bamboo.
5. Board for gliding sports according to one of the preceding claims, characterised by a layer construction in which an inner veneer layer (2, 2', 2", 2''', 3, 3', 3", 3''') which comprises bamboo at least partially is disposed directly respectively above and below the core (1, 1', 1'', 1''', 21, 21').
6. Board for gliding sports according to one of the preceding claims, characterised in that the upper belt (4, 4', 4", 4''') and the lower belt (5, 5', 5", 5''') respectively are applied directly on the inner veneer layer (2, 2', 2'', 2''', 3, 3', 3'', 3''').
7. Board for gliding sports according to one of the preceding claims, characterised in that the bamboo of the core (1, 1', 1'', 1''', 21, 21'), of the lower belt (5, 5', 5'', 5'''), of the upper belt (4, 4', 4", 4''') and/or of the inner veneer layers (2, 2', 2", 2''', 3, 3', 3", 3''') is not butted in the longitudinal direction of the board for gliding sports.
8. Board for gliding sports according to one of the preceding claims, characterised by side cheeks (10, 10') which laterally overlap the core (1, 1', 1'', 1''', 21, 21') and/or the inner veneer layers (2, 2', 2'', 2''', 3, 3', 3'', 3''').
9. Board for gliding sports according to claim 8, characterised in that the side cheeks (10, 10') have vapour barriers (12, 12') on the core side.
10. Board for gliding sports according to one of the preceding claims, characterised in that an attachment device for a binding is provided, the core (1, 1', 1'', 1''', 21, 21') and/or the inner veneer layers (2, 2', 2'', 2''', 3, 3', 3'', 3''') having wood in the load introduction region of the attachment device.
11. Board for gliding sports according to one of the claims 3 to 9, characterised in that an attachment device for a binding is provided, the core (1, 1', 1'', 1''', 21, 21') comprising bamboo slats (1,1', 1'', 1''') in the load introduction region of the attachment device and angularly-milled bamboo (21, 21') in the remaining regions.
12. Board for gliding sports according to one of the preceding claims, characterised in that the upper belt (4, 4', 4", 4''') is edged at least partially by a metallic cover (11, 11').
13. Board for gliding sports according to one of the preceding claims, characterised in that the bamboo of the core (1,1', 1'', 1''',21,21'), of the inner veneer layers (2, 2', 2'', 2''', 3, 3', 3'', 3'''), of the upper belt (4, 4', 4'', 4''') and/or of the lower belt (5,5',5'',5''') has bamboo of the "Guadua angustifolia" type.
14. Board for gliding sports according to one of the preceding claims, characterised in that the bamboo of the core (1, 1', 1'', 1''', 21, 21'), of the inner veneer layers (2, 2', 2'', 2''', 3, 3', 3'', 3'''), of the upper belt (4, 4', 4'', 4''') and/or of the lower belt (5, 5', 5", 5''') has a tensile strength of at least 30 kN/cm², a modulus of elasticity under tensile load of at least 2.5 MN/cm² and/or a fibre length of at least 1 cm.
15. Board for gliding sports according to one of the preceding claims, characterised by a cover layer (9, 9', 9", 9''') which comprises a bamboo of the "Phyllostachys pubescens" type and/or a bamboo with a Brinell hardness of at least 32 HB and/or a bulk density of at least 0.79 g/cm³.
16. Board for gliding sports according to one of the preceding claims, characterised by a protective layer which is applied at least on parts of the surface of the cover layer (9, 9', 9", 9''').
17. Production method for a board for gliding sports according to one of the claims 1 to 16, in which a lower belt (5, 5', 5", 5'''), a core (1, 1', 1'', 1''', 21, 21') and an upper belt (4, 4', 4", 4''') are disposed in a contour mould one above the other, with the steps:

    - production of the core (1, 1', 1'', 1"', 21, 21') at least partially from bamboo,

    - production of the lower belt (5, 5', 5'', 5''') and/or of the upper belt (4, 4', 4", 4''') at least partially from bamboo,

    - direct gluing one upon the other of the lower belt (5, 5', 5'', 5'''), of the core (1, 1', 1'', 1''', 21, 21') and of the upper belt (4, 4', 4", 4'''), and

    - pressing of the lower belt (5, 5', 5'', 5'''), of the core (1, 1', 1'', 1''', 21, 21') and of the upper belt (4, 4', 4", 4''') under pressure at 150 °C.
18. Production method according to claim 17, characterised by disposing and gluing an inner veneer layer (2, 2', 2'', 2''', 3, 3', 3'', 3''') between the core (1, 1', 1'', 1''', 21, 21') and the upper belt (4, 4', 4", 4''') and/or between the core (1, 1', 1'', 1''', 21, 21') and the lower belt (5, 5', 5'', 5''').
19. Production method according to claim 17 or 18, characterised by the use of unprocessed boards with a thickness between 0.5 cm and 3 cm for the core (1, 1', 1'', 1''', 21, 21'), the inner veneer layers (2, 2', 2'', 2''', 3, 3', 3'', 3'''), the upper belt (4, 4', 4", 4''') and/or the lower belt (5, 5', 5", 5'''), the unprocessed boards being produced from angularly-milled bamboo (21, 21') and/or bamboo slats (1,1',1'',1''') by gluing.
20. Production method according to one of the claims 17 to 19, characterised in that the core is produced from bamboo with alternating directions relative to the longitudinal direction of the core (1, 1', 1'', 1''', 21, 21').
21. Production method according to one of the claims 17 to 20, characterised in that bamboo of the "Guadua angustifolia" type is used.

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