EP0086939A2 - Coating material and coating for a ski for varying snow conditions, and method of making the same - Google Patents

Abstract

A tread or a covering material and a covering (20) for a cross-country or cross-country ski for changing snow conditions are described, which can be used as a climbing aid in the central area (13) of the ski tread. The covering (20) consists of a soft, elastic material and also contains a harder particle component (22). Some of these harder particles are designed so that they stick out of the bottom surface of the ski base, which is done, for example, by grinding the surface (21 ') of the ski base plate (20) provided as the base surface such that a hairy cover (21 ) forms, in the area of which the protruding particles (23; 30; 31) with their roots (23 '; 30'; 31 ') are fastened in the elastomer component (24). Also described is a method for producing the base material and the base, and a cross-country or cross-country ski, in which the base material according to the invention is used.

Description

The invention relates to a covering for a ski for changing snow conditions, in particular for a ski for off-road or. Cross-country skiing, according to the preamble of claim 1, and to a method for its production.

The invention also relates to a ski for changing snow conditions, in particular to cross-country or cross-country skis, the bottom sliding surfaces (17, 18) of which are made of polyethylene or another material are coated with a sufficiently small coefficient of sliding friction and in which the central region (13) of the sliding base which comes into contact with the snow during the push-off phase is formed with an elastically behaving material to form a holding base (20) or adhesive coating.

The proper function of a ski for cross-country or cross-country skiing, i.e. the sticking and sliding function are based on the fact that the sticking or resting friction between the ski floor surface and snow is large and the sliding or moving friction is small. If this condition is met, you can push off your skis and slide well. On the other hand, snow essentially contributes to the creation of favorable friction properties for the adhesive and gliding properties of the ski. The state of the snow changes with the change in temperature and age of the snow crystal, which is why, as is known, off-road or cross-country skis had to be waxed; A layer of a certain wax-like material had to be drawn over the surface of the ski, which was suitable for achieving the friction properties desired for the prevailing snow conditions.

The static or static friction between snow and ski, that is, the holding capacity depends primarily on the crystal shape of the snow. It is known that the. The crystal shape of the snow changes depending on the age of the snow crystal, the snow temperature and the humidity. The snow crystal has numerous different shapes, but the sharpness of the crystal tips is essential in this context. Fresh snow that has fallen during frost has very sharp tips and a fine distribution. As the snow ages, the crystals grow together with their tips blunt.

When the temperature rises to near 0 degrees, the moisture of the snow increases and at the same time the sharp tips of the crystals melt. Due to the influence of moisture, the internal friction of the snow increases and the crystals easily stick to each other as well as to surfaces that absorb water.

Sufficient static friction can be achieved with frost snow, which has sharp tips, with the aid of a suitably hard, elastically behaving material into which the sharp tips of the snow crystals can penetrate. Materials of this type are e.g. Polyurethane elastomer, rubber or the like is known. By choosing an elastomer whose hardness is as strongly temperature-dependent as possible, the range of functions is expanded favorably.

If there is a transition to temperatures above zero, the prerequisites for the development of static friction change, since this occurs on the surface of the snow. Crystalline water forms a film on the ski tread. This influence prevents the crystals from coming into direct contact with the base material or the surface of the ski, the water film acting as an anti-friction lubricant.

Successful waxing can achieve both good gliding and good ski stamina. However, the selection of the suitable waxes for the different snow conditions and the execution of the waxing require a great deal of specialist knowledge and experience, and in many cases even specialists fail.

On the other hand, the snow conditions can change very quickly, so that adhesion and / or gliding properties e.g. can deteriorate significantly during a competition, for example. A disadvantage of waxed ski surfaces is that the waxing agents can be used up quickly under certain conditions.

It would therefore be a decisive step forward if a ski floor surface or ski surface could be created that has both good sliding and good holding or adhesive properties in changing snow conditions. The creation of such a ski base is the main object of the present invention.

As is known, the function of the ski waxes is based on the fact that the sharp tips of the snow crystals penetrate into the elastic or plastic surface layer formed by the waxing agents and thereby generate a sufficiently large amount of static or static friction which gives the ski its holding power. In the case of waxed and unwaxed skis, the ski slides mainly on a thin film of water by melting the tips of the snow crystals under the influence of kinetic friction.

Various types of ski flooring or topping are known which are composed of active and passive parts which penetrate into the snow and bring about a mechanical hold. In this regard, the use of a ski base is known, the surface of which is profiled in the form of a scale. The scales form sloping planes on which the skis slide. The vertical steps of the scales, which are directed to the rear, prevent them from sliding backwards and guide them by piling up the snow in front of them.

A cavity and step floor or covering is also known, the function of which is based on the same mechanism as that of the scale covering, but the profile is negative. The gliding behavior is better with this floor, but the holding or adherence is worse than with the scale covering. As an example of this solution, reference is made to NO-AS No. 89238.

Various hairy ski floors or toppings are also known, in which e.g. synthetic hair strips are attached, the hair is slanted in the direction of sliding. With these floors, a movement directed against the hair creates the holding or sticking of the ski during the push-off process. As an example of these known floors, reference is made to DE-AS No. 1 144 165 and FI-PS No. 43401.

Ski floors or coverings or treads are also known, in which smooth plastics, e.g. Teflon, for which a very small coefficient of friction is characteristic. For example, see U.S. Patent No. 2,908,506. However, the stopping problem is not solved with these skis.

Furthermore, various types of ski coverings are known, in which attempts have been made to improve the inherently poor adhesion for wax materials for many plastic coverings. As an example of this, reference is made to US Pat. No. 3,897,074 (corresponding to FI Patent No. 43401), from which it is known to carry out the surface treatment of the floor or the tread by grinding such that a knob-shaped surface is formed on the ski floor forms, 'which ensures the glide of the ski.

It is characteristic of all the known mechanical ski floor constructions mentioned that they work relatively well in certain snow conditions which are limited in a relatively narrow range, but are almost unusable under other conditions. E.g. the shed floor works very well in both wet and fresh snow, but cannot prevent the ski from sliding backwards satisfactorily on icy ground. The function of the shed floor is also impaired by rapid wear, since the holding of the ski floor surface is only effective when the rear edges of the shed are sharp. The other versions mentioned above each have certain disadvantages, due to which they have not become popular in skiing circles.

With regard to the prior art, reference is made in particular to the applicant's FI patent No. 434011. Accordingly, a textile fabric is used as the ski floor material, the fibers of which extend at least to the interface of the sliding surface of the ski floor. The main task of this solution is to achieve good adhesion of the ski wax to the sliding surface with the help of the fibers. This sliding floor also has certain disadvantages, which are that the production of the sliding floor is difficult and the fibers wear out and break off quickly.

The invention has for its object to provide a ski floor or base that has both good holding and gliding properties even in changing snow conditions. Another object is to provide a simple method for producing such a covering.

This object is achieved with regard to the ski base by the features specified in the characterizing part of patent claim 1 and with regard to the method by the method steps specified in the characterizing part of patent claim 11.

The covering according to the invention and the manufacturing method can be used in particular for a ski which has an adhesive coating only in the central region of the ski running surface, but otherwise has bottom surfaces which have a very small coefficient of sliding friction.

According to the invention, a ski covering is created, the covering material of which consists of at least two mechanically different covering components. One covering component forms the soft, elastic matrix of the covering. Whose viscoelasticity is chosen so that the snow crystals or ice pellets in cold snow, powder snow or on coarsely crystalline) eisigern snow in the soft, elastically behaving component can penetrate to a sufficiently strong links between the Skibe _- lay and secure the underground . The other covering component is more and more effective when the snow gets wet. The water layer that occurs or forms between the ski and the ground in wet snow, which then acts as a kind of lubricant and greatly reduces the ability of the ski to be pushed off or adhered to, is penetrated by the particles protruding from the soft base component. The particles are hard and / or stiff enough to press into the snow through the water layer. In this way, a high static friction between the ski and the ground can be achieved even under these conditions, because the snow is very firm even in this case and the few hard particle tips in the ski base provide a good grip between the snow crystals hold. The ski base according to the invention therefore works extremely effectively in all snow conditions.

The particles forming the further covering component can be shaped differently, fibers, spherical bodies, granular bodies or crystals being able to be used. It is important that they are designed so that they can be extracted from the finished, e.g. Stand out the finished ski base in the form of stiff tips, grains or fibers. This is achieved, for example, in that the particle materials are matched to the material of the soft, elastically behaving covering component in such a way that a good mutual anchoring of the covering components is ensured. If the underside or the tread of the ski covering according to the invention is then machined, the softer covering component is primarily or mainly removed and the particles contained in the covering material form the stiff peaks or similar bodies protruding from the ski covering during this process, but remain firmly in place the soft and elastic rubber components.

A preferred development of the ski base results from the features of subclaim 2. In this case, fibers are mixed into the base material, which fibers are made to grind out of the base tread by grinding or another similar processing method. With these fibers a hairy surface is thus produced in the middle part of the ski tread, the favorable properties of which in turn are based on the free ends of these fibers destroying the water film formed from the water of the snow crystal surface under the ski tread; thereby achieved that the crystals come into direct contact with the elastically behaving covering material of the ski in such a way that there is sufficient rest friction with regard to the adherence or holding power of the ski.

Peaks protruding from the sliding surface can advantageously also be produced if the particles are rod-shaped or granular.

The soft, elastic material of the covering advantageously consists of at least one elastomer. For the covering component consisting of the elastomers, polyurethane, a suitable rubber mixture, modified epoxy resin, polyvinyl chloride (PVC) or similar elastomers or a mixture of several such elastomers is preferably used. The hardness of the covering component formed by the elastomer or the elastomer mixture should be chosen so that it increases relatively sharply with falling temperatures. This has a very advantageous effect on the optimization of the sliding properties, since the snow crystals become harder and sharper at lower temperatures.

• Fig. 1 zeigt einen Skiboden bzw. -belag von unten gesehen sowie die Unterschiede des Flächendruckes zwischen dem Gleitboden des Skis und dem Schnee in verschiedenen Phasen des Skilaufes.
• Fig. 2 verdeutlicht die verschiedenen Phasen des Skilaufes und die Unterschiede des Flächendruckes zwischen Gleitboden und Schnee in diesen Phasen.
• Fig. 3 zeigt den Querschnitt des erfindungsgemäßen Gleitbodens des Skis und Fig. 3 ist gleichzeitig der Schnitt III-III von Fig. 1.
• Fig. 4 zeigt in 100-facher Vergrößerung einen Querschnitt des erfindungsgemäßen Belagmaterials vor der Schleifbehandlung des Gleitbodens bzw. der Gleitlauffläche.
• Fig. 5 zei^qt in 100-facher Vergrößerung die Schnittansicht der Lauffläche des Skis, nachdem sie derart geschliffen wurde, daß sie erfindungsgemäß funktioniert.
• Fig. 6 zeigt ein Diagramm zur Darstellung des Verlaufs der Härte der Elastomerkomponente über der Temperatur.
• Fig. 7 zeigt den Verlauf der Haftreibung der Elastomerkomponente, der Fasern und des Belagmaterials insgesamt über der Schneetemperatur.
• Fig. 8 und 9 zeigen jeweils in einer der Fig. 5 ähnlichen Darstellung stark vergrößerte Schnittansichten einer weiteren Ausführungsform des Skibelags im fertig bearbeiteten Zustand.

The invention and its physical background are described in detail below with reference to the figures of the accompanying drawing.

• Fig. 1 shows a ski floor or base seen from below and the differences in the surface pressure between the sliding floor of the ski and the snow in different phases of skiing.
• Fig. 2 illustrates the different phases of skiing and the differences in the surface pressure between sliding surface and snow in these phases.
• 3 shows the cross section of the sliding base of the ski according to the invention and FIG. 3 is at the same time the section III-III of FIG. 1.
• 4 shows a cross section of the covering material according to the invention in a 100-fold enlargement before the grinding treatment of the sliding floor or sliding surface.
• Fig. 5 zei ^q t in 100x magnification, the sectional view of the tread of the ski after it has been ground so that it works according to the invention.
• 6 shows a diagram to show the course of the hardness of the elastomer component over the temperature.
• 7 shows the course of the static friction of the elastomer component, the fibers and the covering material overall over the snow temperature.
• 8 and 9 each show, in a representation similar to FIG. 5, greatly enlarged sectional views of a further embodiment of the ski base in the finished state.

The main principles of the function of the ski are explained below with reference to FIGS. 1 and 2.

The function of a cross-country ski presupposes that between the bottom 13, 17, 18 of the ski 10 and the Snow a sufficiently large static friction for pushing off and a small sliding friction can be achieved when sliding. In modern ski production technology, the fulfillment of the above-mentioned conditions by means of ski base material, ski wax and correct ski curvature is aimed for. The purpose of the floor material, which is often used today as polyethylene plastic, is to achieve a small sliding friction between ski and snow. Polyethylene satisfies this requirement satisfactorily at all temperatures and all snow structures.

The static friction required for the push-off is normally achieved by ski wax, which is selected depending on the snow structure and temperature. It is generally known that the effect of the waxes is based on the tips of the snow crystals penetrating into the plastically behaving wax layer and thereby causing the friction required in the impression phase. Since the wax layer is softer than the ground itself, it also tends to weaken the glide of the ski, which is why the skier must always make the right compromise between holding and gliding. The function of the wax could be significantly promoted by the correct design and the shape of the ski's pretension or curvature, with which the aim is to influence the surface pressure between the ski and snow in different phases of diagonal step skiing.

If the arch of the ski arch is chosen to be parabolic and the ski binding 11 is fastened at a point at which the skier's impression force is directed onto the vertex of the parabola, the result is that the surface pressure between the ski and the snow is diagonal Step skiing in principle behaves according to FIG. 2, the different phases of which are described in more detail below.

Phase 1 ± push-off: The entire weight of the skier lies fully on the ball of the push-off leg 12. In addition to the pressure force, the push-off force generated by the muscles is effective, which can be 1.5 to 3 times the pressure force. The total effect of these forces results in the surface pressure, which is greatest under the repulsion point and decreases quite steeply in both directions (curve shown in dashed lines in FIGS. 1 and 2 (phase 1)).

Phase 2 ± glide: The entire weight of the skier is entirely on the moving leg, evenly distributed on the heel and ball of the foot. The point of action of the force shifts about 1/3 of the foot length from the previous phase to the rear end of the ski. The surface pressure between ski and snow changes significantly when the parabolic vertex is detached from the base and the pressure is distributed over two vertices that lie on both sides of the leg 12. The curve representing the distribution of the surface pressure ₎ shown in full line in FIG. 1 corresponds to the cross line curve according to FIG. 2. The dashed curve according to FIG. 2 represents the surface pressure in comparison with the cross line curve for the case when a stiffer ski or a lighter skier can be considered.

Phase 3 = downhill: the weight of the skier is even on both skis. The pressure is distributed as in phase 2, so that both skis can only be loaded by half the weight of the skier. The curve marked with a dash in FIG. 1 corresponds to the curve shown in dashed lines in phase 3 of FIG. 2. The curve marked with a slash corresponds to a situation in which the ski is more elastic or the skier is heavier.

Based on the above, it can be stated that the sliding friction coefficient on the support and rear part 17, 18 of the sliding surface of the ski is important for the sliding of the ski and that the coefficient of static friction in the central part 13 of the ski is important for maintaining it.

3 shows the cross section of a ski according to the invention. The ski 10 is a layered plate construction and its load-bearing parts consist of a cover plate 14 and a base plate and a rigid foam core 15 located between them, which has harder side parts 16 which arise in the molding phase. 1 and 3, the tip and the rear part 17 and 18 of the sliding base of the ski 10 are coated with only lubricity-producing polyethylene plastic or the like, and the central part 13 of the ski is coated with a bottom part 21 according to the invention which generates a holding capacity. In a special case, the sliding base of the ski can be completely coated with the base material plate 20 according to the invention. On the floor 17, 18, 20 there is a channel 19 known per se.

Two non-limiting examples of the composition of the floor panel material are described below.

example 1

_'' 20% by weight of polyamide fibers with a diameter of 10 ... 20 µ, length 0.5 ... 1.0 mm, 80% by weight of polyurethane latex.

Example 2

20% by weight of polyamide fibers with a diameter of 10 ... 20 µ, length 0.5 ... 1.0 mm, 80% by weight of rubber mixture, the basic elastomer of which is made of nitrile rubber.

If the floor or covering material 20 according to the invention is cast in the manner described above, a surface 21 'is achieved from which the fibers 22 do not stick out.

FIG. 4 shows a 100-fold enlargement of a floor material 20 produced according to Example 1 described above, the elastomer component of which is designated by reference numeral 24. In Fig. 4 it can be seen that the surface 21 'of the floor material plate 20 is flat. According to the invention, the surface 21 'of the base material plate 20 is ground either before casting the ski or before fixing it to the ski base or after casting the ski or after fixing the base with a grinding wheel or a belt grinder of suitable coarseness or in a corresponding manner. In this grinding phase, some of the fibers in the elastomer component 24 emerge as free fibers 23, which are attached to the elastomer component 24 with their roots 23 ′. In this way, a hairy fiber surface 21 is achieved, which the in Fig. 5 schematically resembles. Naturally, part of the fibers located on the surface 25 is completely separated or torn off. These torn-off fibers are designated by reference number 26.

If polyamide fibers or other corresponding sufficiently strong and tough fibers are selected as the fiber material, a hair surface 21 which is sufficiently durable and sufficiently dense for the purpose of the invention is achieved. The main function of this hair surface is that the fibers 24 destroy the water film which forms on the base material of the ski, and therefore sufficient contact of the snow crystals with the elastically behaving base material is achieved with regard to holding. Naturally, the fibers 23 align to a certain extent with the line in the direction of skiing and the fibers 23 can have a certain mechanical holding effect.

In comparative tests carried out, the most advantageous thickness of the fibers 22 was a range between approximately 5 and 100 μm, expediently between 10 and 20 μm. A range between approximately 0.1 and 2 mm, expediently between 0.5 and 1 mm, was determined as the most favorable average length of the fibers protruding from the ground surface 25. The appropriate amount of the healing fibers remaining on the surface 25 in the grinding phase was determined to be approximately 2 to 100 pieces / mm ^2, suitably approximately 10 pieces / mm. As fibers 22, polyamide fibers and / or other corresponding fibers are used, which are of such a type that they anchor themselves on an elastomer component 24, tolerate the manufacturing temperatures of the base plate component and are mechanically sufficiently durable and tough.

The material or the material combination of the elastomer component 24 is selected so that the holding effect of the sliding base of the middle part 13 of the ski is based on the elasticity of this base part in such a way that the tips of the snow crystals in the repulsion phase (FIG. 2, phase 2) are sufficiently deep can penetrate the surface plane of the floor, so that small depressions are formed in the floor 20 '. Most advantageously, the material for the elastomer component is selected so that its hardness increases as the temperature decreases. A typical example of this is an elastic combination material flooring or covering, the hardness of which is approx. 50 SHORE D at a temperature of -20 ° C and approx. 40 SHORE D at a temperature of 0 ° C, and the hardness as the temperature increases decreases substantially linearly within the temperature range generally used in skiing. 6 shows the course of the hardness of the elastomer component over the temperature.

FIG. 7 shows the operating behavior of the ski covering material or ski coverings according to the invention in the entire temperature range of use of the ski. The abscissa shows the temperature of the snow and the ordinate the static friction.

The solid line represents the overall static friction of the ski base. On the one hand, the elastomer component (dash-dotted curve) and on the other hand the fibers (dashed line) contribute to this overall static friction, so that the solid line is created by superimposing the other two curves. It can be seen that the fibers at low temperatures - due to the greater hardness of the elastomer component present there - make only a small contribution to increasing the friction that however, they become increasingly effective in the vicinity of the freezing point and virtually compensate for the drop in the static friction curve of the elastomer component by now sticking out more effectively from the softening elastomer component. With this interaction of the base components, an essentially constant push-off adhesion or holding capacity of the base can be achieved in the entire operating temperature range of the ski.

At plus temperatures, the hairy surface 21 formed from the fibers also has a destructive effect on the water film in the manner described above, the elasticity-holding effect of the surface 25 being achieved. The effect of the fibers 23 is particularly important when the water content of the snow is high. A sufficient holding effect at frost temperatures would also be achieved without fibers 23 by means of suitable elastomers, but in watery snow conditions the holding of the ski can be significantly improved by the hair-ground sliding base 20 according to the invention.

8 and 9 show further embodiments of the ski base. In the cases shown there, deviating from the exemplary embodiment described above, no fibers, but rod-shaped particles 28 or granular bodies 29 are embedded in the covering component 24 formed by the elastomer or the elastomer mixture. The particles 28 and 29 are in turn formed by solid bodies. The covering consisting of the soft covering component (elastomer component) and the particle covering component can also be cast as a plate. These covering plates are then cut and used in the middle area of the ski tread. When finished, the adhesive covering is then finished. Through this endbear processing is primarily removed the elastomer component, so that the harder particles with the sections 30 and 31 protrude from the surface 25 of the surface. The particles 28 and 29 remain firmly anchored with the root sections 28 'and 29' in the elastomer component 24. During the finishing of the ski base or adhesive base, the particles 28 and 29 can also be subjected to a change in shape. The finishing of the ski covering plate in this way also results in a hairy or rough top surface 21 in this case, which, when the snow becomes wet, the water that forms between the ski covering and the ground. can destroy film layer.

It should be particularly emphasized that the invention is not intended to be limited to the embodiments described above. Thus, in a modification of the described embodiments, the soft, elastically behaving ski covering component can also consist of polyethylene or of PVA (polyvinyl alcohol or vinal) or of mixtures of these materials with the components described above. Furthermore, the harder particles can also be present in the form of spheres in the elastomer component. Particle crystals can also be used.

The hardness of the elastomer component is, for example, at room temperature in the range between 60 and 80 Shore D and preferably increases with a predetermined course as the temperature decreases.

The invention thus creates a tread or a covering material and a covering for a cross-country or cross-country ski for changing snow conditions, which as Climbing aid can be used in the central area of the ski tread. The covering (20) consists of an elastic, soft material and also contains a harder particle component. Some of these harder particles are designed so that they stick out of the bottom surface of the ski base, which is done, for example, by grinding the surface of the ski base plate provided as the bottom surface in such a way that a hairy blanket forms on the ground surface, in which the protruding particles with their Roots are attached to the elastomer component. The invention also provides a method for producing the base material and the ski base as well as a ski for changing snow conditions, in which the base material according to the invention is used.

Claims (15)

1. Base material and base for a ski for changing snow conditions, in particular for a ski for cross-country or cross-country skiing, which can be used as a climbing aid in the central area of the ski tread and has a soft, elastic behavior material, characterized in that the elastic-acting material contains harder particles (22; 28; 29), some of which stick out of the ski tread (25). 2. Covering according to claim 1, characterized in that the harder particles of short-cut fibers (22) are formed. 3. Covering according to claim 1, characterized in that the harder particles are formed by rod-shaped bodies (28). 4. Covering according to claim 1, characterized in that the harder particles are formed by grains (29). 5. Covering according to one of claims 1 to 4, characterized in that the soft, elastically behaving material consists of at least one elastomer (24) in which the harder and / or stiffer particles (22; 28; 29) are embedded. 6. Covering according to one of claims 1 to 5, characterized in that the proportion of particles (22; 28; 29) makes up about 20% of the weight of the amount of elastomer (24). 7. Rubber according to one of claims 1 to 6, characterized in that polyurethane, a suitable rubber mixture, modified epoxy resin, polyvinyl chloride (PVC) or similar elastomers or a mixture of several elastomers is used for the elastomer component of the rubber. 8. Covering according to one of claims 1 to 7, characterized in that the particles (22; 28; 29) made of plastics from the group with polyamide, polyester, acrylic, etc. and / or consist of glass, carbon or polyamide and similar materials that are sufficiently strong and tough and can form a sufficiently firm connection with the soft, elastically behaving material. 9. Covering according to one of claims 2 or 5 to 8, characterized in that the diameter of the fibers in the range between 5 microns and 20 microns, preferably in the range between about 5.gm and 10 microns and / or that the average length of the free part (23) of the fibers protruding from the ski tread (25) is in the range between approximately 0.5 mm and 1 mm and / or that the quantity of fibers is approximately 2 to 100 pieces / mm ² , preferably approximately 10 is up to 30 pieces / mm ² . 10. Covering according to one of claims 4 to 8, characterized in that the size of the particles (29) is in the range between 2 µm and 20 µm and the number of particles is preferably between 2 and 20 pieces / mm. 11. Covering according to one of claims 1 to 10, characterized in that the covering component formed by the soft, elastic material is of the type that its hardness increases significantly with falling temperature, expediently such that the hardness in the temperature range of -20 ° C increases to 0 ° C by approx. 10 SHORE D. 12. A method for producing a ski base, in particular according to one of claims 1 to 10, characterized- _' characterized in that one or more elastomer components (24) and a particle component (22; 28; 29) are mixed together so that from the so obtained Mixture of ski covering plates (20) are produced, and that the surface (21 ') of the ski covering plate (20) provided as a ski tread is ground or treated in such a way that a hairy part of the particle component (22; 28; 29) exists on the ground surface Surface (21) is formed, which is formed by such protruding particles (23; 30; 31), which is attached with its roots (23 ';30'; 31 ') in the covering component (24) formed by the soft, elastically behaving fabric are. 13. The method according to claim 12, characterized in that the ski covering plate (20) is attached to the ski tread, and that the ski covering surface (21) is ground after the production of the ski in such a way that the hairy surface (21, 23) is formed . 14. The method according to claim 12 or 13, characterized net due to the use in the production of an adhesive covering of a cross-country or cross-country ski used in the central area of the ski tread, the sliding surfaces (17, 18) of which are coated with polyethylene or another material with a sufficiently low coefficient of sliding friction and in which the central area ( 13) the ski tread is coated with the adhesive covering material. 15. Base according to one of claims 1 to 11, characterized by the use as an adhesive in the central region of the ski tread of a cross-country or cross-country ski, the sliding surfaces (17, 18) with polyethylene or another material with a sufficiently small coefficient of sliding friction are coated and in which the central region (13) of the ski tread is coated with the adhesive covering material.

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