SE510405C2 - Method for producing artificial grass - Google Patents

Abstract

The method involves using a light mobile installation based on modified artificial grass into which is built an elastic support layer in the grass fibres. A wear and slide surface outer layer comprises rubber articles of specifically sepd. fractions and density.

Description

20 25 510 405 2 h) Possibility to dismantle and re-install the artificial turf i) Environmental and health factors j) Maintenance and care needs k) Operating cost incl. depreciation 1) Investment cost m) Artificial turf life, wear.

Two main types of solutions, so-called "Classic" and "sand-filled" artificial grass, have previously been on the market.

“Classic artificial grass” has consisted of prefabricated carpets with close-fitting short straws (10-15 mm) of artificial support that have supported each other in an upright position.

“Sand-filled artificial grass” has consisted of prefabricated carpets with sparser long straws (25-50 mm) of artificial material that has been filled to 80% with sand. The function of the sand has been to support the fibers in an upright position and to stabilize the carpet in place due to its weight.

The substrate for both types has, in order to achieve the desired deformation, force absorption and ball bounce, consisted of an elastic shock-absorbing layer of various kinds. These substrates have usually consisted of foamed plastic materials, rubber coatings or att berrnattar.

The "classic" grass has consistently had too high surface friction and little elasticity to satisfy the desired requirements. The properties have also deteriorated relatively quickly as the grasses have been pressed down and folded. The advantage of the design, however, has been that it has a relatively light construction and thus has enabled mobile solutions.

With the “sand-filled” grass, the presence of sand in the surface layer has reduced the friction and the mobility of the sand has also contributed to greater deformation and the ability to absorb force. 15 3 cm 405 The disadvantage of the sand grass is that the sand is compressed after a while, whereby the positive properties decrease. In outdoor installations, this compaction takes place in combination with moisture and particles in the form of sediment from air pollutants and mutual wear of the sand grains when using the track. These particles together with the moisture form a putty between the grains and thereby bind the sand and reduce its mobility. In indoor installations, the same pond creates an environmental and health problem. In mobile installations, the sand's large weight and volume cause extensive problems of both a technical and economic nature.

The underlying failure layer installed for both types of artificial turf has consistently low thermal conductivity figures. This has the negative effect that if you want to combine the artificial turf with underheat to extend the game season or alternatively make an artificially frozen ice rink during the winter months, the heating and freezing properties deteriorate significantly. The object of the invention is to provide an artificial turf which, in combination with grass, consists of an elastic bearing and wear layer.

This is accomplished by an artificial turf according to claim 1. The formed layers are maintained and recreated.

The solution is that the top layer of the support layer has a coarser fraction than the lower layer of the support layer. By adding filling material to the grass fibers with a mixture of gurnnikom and gurnmi- / sandcomb with specifically different fractions and specifically different densities, the physical properties of artificial grass are affected by ball games, such as friction, force absorption, deformation, ball bounce and flexibility, , such as combination utilization, disassembly, reinstallation, maintenance, environmental and health factors, wear and longevity. The invention will be described in more detail in the form of an exemplary embodiment with reference to the accompanying figures, in which Fig. 1 shows a structural section of an artificial grass construction where the filling material in artificial grass ema consists of two separated different fractions of light elastic material according to the invention.

F ig. 2 shows a construction section of an artificial grass construction where the filling material in the artificial grass fibers consists of a homogeneous mixture of light elastic material and mineral material.

According to the invention, it has surprisingly been found that, by adding rubber grains 1, 3 with specifically different grain sizes to a modified classical artificial grass (fi g. 1), one can influence the different properties of the artificial grass. Smaller rubber grain size in the grass 'bottom layer affects the grass' power absorption capacity, deformation and elasticity and reduces the change in properties over time. By varying the grass density, an additional effect of these properties can be achieved. Coarser grains 1 in the surface reduce the surface friction and wear on the tops of the grasses 2. A prerequisite for these properties to be achieved, however, is that the different rubber types and fractions can be kept separate, as otherwise partially opposite properties arise.

It has further surprisingly been found that in sandy / artificial grass (Fig. 2) even small additions of rubber grains 8 to the sand give a large difference in the mobility of the sand and reduced abrasion of both sand grains and grass fibers 7. It has further been shown that by adding larger amounts of gurn micromet 8 to the sand, the underlying failure layer can be completely or partially eliminated. In both cases, however, the condition applies that the rubber comet 8 is maintained well mixed in the sand. The fact that the failure layer can be completely eliminated improves the possibilities of using a sand with extremely good heat-conducting properties (for example quartz sand) in the rubber mixture for installation of underlying heating and cooling systems (10).

It is previously known that grains in a mixture of the same size but different weights when stirring, sieving or vibrating separate so that the heaviest grains collect at the bottom. It is further known that materials of equal weight but different sizes separate so that the smallest grains collect at the bottom.

The elastic support layer with wear and sliding layers in grass fi brema consists of light filling material consisting of different separated fractions of elastic material, preferably rubber bowl, the grain size of the elastic support layer being 0.1-1.5 mm, preferably 0.4-0. 8 mm, and folds up to about 90% of the bearing height. The filling material for the wear and sliding layer consists of light filling material, preferably rubber with a grain size of 0.5-4.0 mm, preferably 1.0-3.0 mm.

The filling material for the wear and slip layer consists of rubber grains with a higher density, where the increase is 10-100%, preferably> 20%, of the rubber grain density of the elastic support layer.

A homogeneous mixture of filling material consists of different fractions of elastic material, preferably rubber grain and mineral material, preferably sand grain. The fraction of the elastic material is characterized in that the grain size is 0.1-1.5 mm, preferably 0.4-0.8 mm. The sand is characterized in that the grain size is 0.2-4.0 mm, preferably 0.6-1.2 mm.

The task of the mixture is to support the grasses to an upright position from the bottom up to the filling height of about 80% of the grass height. The mixing ratio between rubber and sand material varies between 2/98 and 98/2%, but preferably between 20/80 and 20 μl 405 6 80/20%. The difference between the rubber and sand phaldion should be such that the average grain for the sand is 10-200% larger than the average grain for the rubber grains, but preferably 20-50% larger. The sand consists of minerals with high thermal conductivity, preferably quartz sand.

However, according to the invention it has surprisingly been found that if the substrate for the artificial turf consists of an elastic layer or that the filling material in the artificial turf consists wholly or partly of elastic grains, an additional parameter is added during practical use and maintenance of the web. After a ball bounce on such a mat, the filling material of the recoil pops up or during a kick against the surface layer and when brushing / skidding the surface, the filling material bounces off to the side. It has been shown that the heaviest grains bounce off the highest and longest, whereby they also graze at the top of the surface.

This condition offers completely new possibilities in that different specific mixing conditions for the filling material control the separation and mobility so that the desired properties in the artificial grass can be significantly improved.

In addition, it is possible to make the construction lighter (for mobile constructions), improved tennis properties and a total of a cheaper installation cost.

Claims (1)

10 15 20 7 i 510 405 Patent claims Artificial turf, comprising an elastic support layer for supporting artificial turf (2) arranged in the support layer, which device is designed to give the artificial turf properties equal to a natural grass, characterized in that the artificial turf comprises a filling material (1,3), which in a lower layer of the support layer consists of a finer fraction of an elastic material (3) and in an upper layer of the support layer consists of a coarser fraction of the elastic material (1), where the lower layer consists of elastic material (3) with a grain size of 0.1-0.9 mm, to provide a force absorption capability in the bearing; and wherein the upper layer consists of elastic materials (1) with a grain size of 1.0-4.0 mm, in order to provide a wear and sliding layer on the upper part of the support layer.