DE2409832B2 - MULTI-LAYER, WATER-PERMEABLE COVERING, IN PARTICULAR FOR TENNIS COURTS - Google Patents

Description

The invention relates to a multi-layer, water-permeable surface, in particular for tennis courts, with an elastic lower layer and a tread-resistant upper layer attached to the lower layer, which has a plastic fabric.

In a known covering with these features is located on an underlayer of one Synthetic fiber fleece a base fabric attached to it with an integrated dense deep pile made of textured Synthetic fibers (DT-Gbm 7130 069). When using this covering, the properties of the Determining high pile, which is supposed to give it a spongy elasticity. Accordingly, the The lower layer is a few millimeters thick, while the deep pile is about 1.5 cm high.

The well-known covering is not sufficient due to the closed surface, which also occurs with piles under load or stress, not the sporting requirements for sufficient smoothness, as they have for example conventional brick dust coverings due to the ball bearing effect of the individual stone balls. The well-known covering shows high adhesion to the athletes' shoe coverings. When the athlete strikes glidingly, for example during spinning, the kinetic energy of the athlete is not destroyed by sliding, as is the case with a brick dust covering, but must be fully absorbed by muscles and bones, which means a risk of injury , but in any case causes premature fatigue.

In addition, the production cost of the well th covering is relatively high because of the pile. On the other hand, the regular and weather permitting required maintenance of conventional other types of clay coverings that match although the sporting stakes Anforde also quite costly.

The lifespan of the well-known synthetic surface is short, among other things because the Sliding on the pavement creates a high level of frictional heat that affects the fibers or bristles on the surface welded together This creates hard tufts, which when the athlete falls through their mechanical Condition can cause injuries.

The invention is therefore based on the object of improving the covering of the aforementioned type in terms of usability, the manufacturing costs and the durability. .

The aforementioned object is achieved according to the invention in that the top layer is a compared to The lower layer is a thin fabric made of hard monofilaments or a correspondingly shaped lattice film

The covering according to the invention has an extremely simple structure and is therefore inexpensive to manufacture. Permanent, weatherproof threads, in particular plastic threads, can be used without further ado can be used for the lower layer as well as for the upper layer. Such a covering only needs low maintenance and easy to maintain. There is another advantage of the covering according to the invention in that the risk of injury and fatigue for the athlete compared to the relevant level of Technology is low, since a harmless destruction of energy by sliding is possible.

The surface can be used without difficulty and without special preparation, e.g. on conventional Asphalt squares are relocated; simply sticking it on is sufficient, for example. With the right choice of the used With raw materials, it is still possible to avoid seams in the covering, for example by choosing up to 50 m wider Fabrics such as those used in papermaking, and needled nonwovens in also of any width.

The covering corresponds most closely to the well-known brick dust coverings because of their surface properties are appreciated. Therefore, it is particularly suitable for outdoor tennis courts, although it is also mi ι great advantage for the venues of other sports can be used.

Expedient developments of the invention are specified in the subclaims.

The two layers of the covering are firmly connected to one another, e.g. B. by a point applied Polyamide glue.

Numerous natural or synthetic materials can be used as the material for the lower layer. For example, it can consist of crimped fibers or needle or nonwovens; a structure Corresponding to conventional carpeting or a mat-like structure is also possible.

The top layer, however, must consist of a highly abrasion-resistant, smooth thread material, accordingly one of the configurations specified in the subclaims, for example made of polyester, polyamide, or polyolefin monofilaments. Additives for matting or reducing reflection, dyes or anti-aging agents can also contain these monofilaments.

Almost equivalent to the thin fabric made of hard fabric used to manufacture the top layer For most of the applications that are considered here, monofilament is an appropriately shaped one Lattice film. The corresponding shaping of the lattice film means, on the one hand, that the lattice approximately like the fabric with relatively narrow and

corresponding to the fabric threads arranged webs is formed, so that the contact surface with a the flat object (shoe sole) located on the lattice film is also no closed avenge; On the other hand, the shape of the lattice film should be analogous to the consisting of hard monofilaments but also mean that the grid films to achieve the desired mechanical properties in the production are preferably stretched.

In the drawing, an embodiment of the> o Invention illustrated It shows

F i g. 1 a perspective view of a section of the covering and

F i g. 2 the covering according to FIG. 1 in cross section.

In the example shown, the covering according to the invention consists of an approximately 1-2 cm thick sub-layer 1 of long, crimped and non-glued plastic core. This layer is wide-meshed and allows water to pass through practically unhindered. It is light, soft, elastic and pliable.

On the lower layer 1 there is a glued-on upper layer 2, which consists of a monofilament fabric with a mesh size of (see FIG. 2) w = 2 mm. The diameter of the monofilament 3 is approximately 1 mm. The material of the monofilament fabric was stretched so that it has an oriented crystallized structure. In this way, the monofilaments are extremely resistant to abrasion.

From Fig. 2 it is clear that the top layer 2 is much thinner compared to the flexible bottom layer 1. In the present case, the thickness ratio is about 1:10.

Due to the special design of the upper layer 2, a low but defined adhesion to the shoe sole material of the athlete is achieved. It is precisely this fact that makes the surface particularly suitable with regard to sporting requirements and the risk of injury and fatigue.

The following compilation provides information about the friction conditions of some known surfaces and a covering according to the invention. It shows the similarity to the known and for sporting purposes suitable brick dust coverings as well as the differentness of other known coverings in this respect Load of 15 kp carried out at a speed of 0 (beginning) to 3 cm / sec over the respective auditory surface. The tensile forces applied were shown electrically with the aid of load cells. The following values were measured and calculated using the formula: coefficient of friction = tensile force / load.

Type of lining Coefficient of friction Coefficient of friction

the adhesion *) the sliding

friction **)

Polyurethane 6.15

Felt covering 5.05

According to the invention. Topping 3.72

Brick flour coating 2.8

5.9
4.6
3.2
2.8

*) The force that is necessary to set the ¹ test body in motion.

'*) According to the speed of 3 cm / sck crows to be used.

Finally, the usability of the covering in halls, on running tracks and the like as a covering should also be mentioned for summer ski slopes and year-round ski jumps, but also for the summer operation of ice shooting ranges the covering according to the invention is also possible.

For this] sheet of drawings

Claims (5)

Patent claims: 1. Multi-layer, water-permeable surface, especially for tennis courts, with a soft, elastic lower layer and a non-slip surface on which Upper layer attached to the lower layer, which has a synthetic fabric, characterized in that the upper layer (2) is an im Compared to the lower layer (1) thin fabric made of ι ο hard monofilaments (3) or a corresponding one shaped lattice film is 2. Covering according to claim 1, characterized in that the diameter of the monofilaments (3) is approximately 0.5-2 mm, preferably 0.9-1.1 mm, and the The mesh size of the fabric should be approximately 1 - 3 mm. 3. Covering according to claim 1 or 2, characterized in that the monofilament fabric is made of stretched, abrasion-resistant polyester, polyamide, polyolefin or the like. * 4. Covering according to one of claims 1 to 3, characterized in that the monofilament anti-aging agent, Contain pigments, stabilizers and / or dyes. 5. Covering according to one of claims 1 to 4, characterized in that the thickness ratio the upper layer (2) to the lower layer (1) about 1: 5 to Is 1:20. .1 °