JPH0814084B2 - Artificial grass ground - Google Patents

Description

TECHNICAL FIELD The present invention relates to an artificial lawn ground used for various athletic facilities such as hockey fields and soccer fields.

(Prior Art) Generally, the base of an artificial lawn is formed of a bituminous material, concrete, or a mixture of concrete, and when an artificial lawn is directly laid on these bases, the sand scattered on the lawn leaves of the artificial lawn is consolidated. As a result of accelerating the progress of the above, the water permeability is deteriorated, and at the same time, the abrasion of the turf leaves of the artificial lawn is accelerated and the buffering effect is reduced.

(Problems to be solved by the invention) Therefore, there is also a method of interposing an elastic body such as rubber between the artificial lawn and the base, but the elasticity of the elastic body is expressed as it is, and the muscle is burdened and easily tired. At the same time, there is a problem that the ball is too bouncing and does not meet the standard.

The standard here is NSF = Netherland Sports F
There is ball repulsion, impact response, etc. defined by the abbreviation = etc. of ederation (Dutch Sports Federation). This "ball repulsion" is the height of the ball repulsion when it falls vertically from a height of 1.5 m onto an artificial lawn.The distance between the surface of the artificial lawn and the bottom surface of the ball is measured between 120 and 300 mm. On the other hand, as for the "impact response", the measurement result using the NSF sports flooring tester is that there is no impact absorption of 40 to 65% on the wet artificial grass. It is said that it will not happen. If they do not meet these standards, they will not be certified as hockey fields.

It is also possible to lay an artificial lawn on the soil surface as the groundwork, but there is a problem that the soil surface collapses due to rainfall or freezing, and the playing surface is not stable.

The present invention has been made in view of these problems, and provides an artificial lawn-made ground that provides a feeling of playing similar to that of a soil surface.

(Means for Solving the Problem) In the present invention, a large number of resin filaments are three-dimensionally cross-bent and continuous between a flat base material and at least a surface material formed by an artificial lawn. A cushion layer composed of a mesh body in which three-dimensional voids composed of peaks and valleys are formed in a substantially regular manner and an elastic granular material filled in the three-dimensional voids of the mesh body is interposed, and this mesh body is formed. The single yarn diameter is set to 0.2 to 3 mm, the area weight per thickness is set to 0.3 g / cm ³ or less, and the porosity is set to 95% or more. On the other hand, the elastic particles mainly have a particle size of 1 to 5 mm and a packing density of 0.3 to 0.8. It is characterized by being set to g / cm ³ .

Such a ground is a sheet having a three-dimensional void consisting of peaks and troughs which are formed by substantially three-dimensionally cross-bending resin filaments on a substantially flat base material and which are substantially regularly continuous. Unfold the reticulated body. After filling the three-dimensional voids formed in this mesh with elastic particles to form a cushion layer, an artificial lawn as a surface layer material is laid on the cushion layer, and if necessary, turf leaves. It is created by spraying sand inside.

In the case of this artificial lawn only, the cushioning property is slightly smaller than that of the artificial lawn in which sand is sprayed, but the ball repulsion and impact response are large, so the cushion layer is slightly harder when using only the artificial lawn. However, in the case of artificial grass with sand, it needs to be slightly softened. The thickness of the surface layer material is
The former is 5 to 20 mm, the latter is 10 to 70 mm, and the sand is filled to a height of 70% thereof.

The elastic particles are formed of olefin, soft polyvinyl, styrene, urethane, etc. in addition to the rubber particles, and most of the particles preferably have a particle size within the range of 1 to 5 mm. If the particle size exceeds 5 mm in many cases, it will be caught in the reticulate body and filling will be difficult, and the voids in the reticulate body will become large and become too soft. On the other hand, if the number of particles having a size of 1 mm or less is increased, the filling property is improved, but the outflow or scattering is increased. Further, the packing density as a whole must be within the range of 0.3 to 0.8 g / cm ³ . If the filling of the elastic particles is small, the strength of the net-like body, which will be described later, becomes weak, and the flatness of the surface layer material cannot be ensured.

Further, the reticulated body is made by dropping a large number of continuous thermoplastic resins each having a diameter of 0.2 to 3 mm, for example, monofilaments such as olefin-based homopolymers or copolymers and soft vinyl chloride, while shaking them on the belt without sufficiently solidifying them. By three-dimensionally cross-bending, the three-dimensional voids composed of a large number of continuous peaks and valleys are formed substantially regularly by heat-sealing each other at the intersecting positions. The thickness is 5 to 30 mm, and the area weight per thickness is 0.
It has a flexibility of ³ g / cm ³ or less and a porosity of 95% or more. If this mesh is fine, it will be cut or buckled during civil engineering work, while if it is thick, it will lack flexibility. If the porosity is small, the elastic particles will not be filled well, and elastic unevenness will occur. If the area weight per thickness is too large, it will be stiff and the original cushioning properties will not be obtained.

(Example) Hereinafter, the Example of this invention is described with reference to drawings.

FIG. 1 shows a first embodiment of the artificial lawn ground according to the present invention. In this embodiment, the base material 1 as a base of the artificial grass 5 described later is formed of asphalt having a substantially flat upper surface, and has sufficient water permeability so that overflow does not occur against rainfall. I have.

A cushion layer 2 is laid on the base material 1. The cushion layer 2 is a sheet-like net-like body 3 in which a large number of resin filaments are three-dimensionally cross-bent to form a three-dimensional void having continuous peaks and valleys in a substantially regular manner.
This mesh body 3 is composed of elastic particles 4 such as rubber particles.

The elastic particles 4 filled in the three-dimensional voids of the reticulate body 3 can move within a range of being restrained to some extent by the reticulate body 3, although they are not completely restrained as adhered.
This movement can absorb energy and weaken elasticity. Therefore, even if the ground is violently used for a long period of time, the elastic particles 4 are unevenly distributed and the cushion layer 2
There is no unevenness in elasticity.

When the cushion layer 2 is laid in this manner, the artificial lawn 5 in which the turf leaves 5b are planted on the base cloth 5a is laid on the cushion layer 2, and the sand 6 is sprinkled into the turf leaves 5b of the artificial lawn 5 to cover the surface layer. The material 7 is formed.

Further, if the base material 1 does not have sufficient water permeability for rainfall, water is separately released, so that a sand layer 8 may be formed as shown in FIG. If the sand layer 8 is spread over the base material 1 and is mixed with the base material 1 as time passes and the water permeability of the sand layer 8 is diminished, a non-woven fabric or a woven cloth is laid on the base material 1. Mixing with the sand layer 8 may be prevented.

The cushion layer 2 and the surface layer material 7 are laid on the cushion layer 2 on the sand layer 8. This cushion layer 2
The surface material 7 is the same as that shown in FIGS. 1 and 2, and its detailed description is omitted.

Further, as shown in FIG. 4, in order to prevent the sand layer 8 spread on the base material 1 from mixing with the cushion layer 2 and mixing with the elastic particles 4, the movement of the elastic particles 4 is prevented. In order to secure the smoothness of the surface layer material 7 by pressing it, a blocking layer may be formed by inserting a nonwoven fabric 9 made of polypropylene or the like in the upper and lower layers of the cushion layer 2.

At this time, the non-woven fabric 9 may be preliminarily attached to the lower portion of the mesh body 3 constituting the cushion layer 2 to be integrally formed, or the woven fabric 10 may be used instead of the non-woven fabric 9 (see FIG. 5). .

Further, when the base material 1 is a hard and stable layer, a part of the non-woven fabric 9 and the woven fabric 10 can be omitted as shown in FIG. 6 or 7.

Concretely showing an example of construction, a net-like body that constitutes a cushion layer is formed into a sheet shape with a single yarn system of 1 mm and a thickness of 10 mm, and most of the net-like particles have a rubber particle size of 2 to 3 mm. The body is packed with a packing density of 0.6 g / cm ³ . And as an artificial lawn, a polypropylene monofilament is flocked with polypropylene monofilaments so as to have a pile length of 25 mm to form turf leaves, and sand is sprinkled on the turf leaves at a rate of 30 kg / m ^2. (Construction example 1).

In Construction Example 1, the impact response was 50% and the ball repulsion was 120 mm.

In addition, the same cushion layer of construction example 1 was used, and as an artificial lawn, construction example 2 in which nylon monofilaments were planted on polypropylene base cloth so that the pile length was 12 mm to form turf leaves (no sand filling) ), The impact response was 48% and the ball repulsion was 150 mm.

On the other hand, as Comparative Example 1, the cushion layer has a thickness of 10
mm, a rubber plate with a density of 0.6 g / cm ³ was laid, and construction example 1 was placed on it.
The same surface layer material (polypropylene monofilament was planted with polypropylene monofilaments to pile length of 25 mm to form turf leaves, and sand was sprinkled on the turf leaves at a rate of 30 kg / m ² ). In that case, the impact response was 30% and the ball rebound was 160 mm.

Further, as Comparative Example 2, a rubber plate having a thickness of 10 mm and a density of 0.6 g / cm ³ was laid on the cushion layer, and the same surface layer material as that of Construction Example 2 (a polypropylene monofilament with a nylon monofilament having a pile length of 12 mm was used thereon). When laid, the impact response was 40% and the ball repulsion was 500 mm.

 The results are summarized in the table below.

When these results are compared with the above-mentioned standards, the impact response is insufficient in Comparative Example 1 and the repulsion of the balls is excessive in Comparative Example 2, and none of them satisfy the standards. It is clear that both 2 conform to the standard.

In this embodiment, the hockey field is shown as an example, but it can be used as another stadium such as a soccer field.

(Effects of the Invention) As described above, in the present invention, between the base material and the artificial lawn, the net-like body and the elastic particles filled in the three-dimensional voids formed in the net-like body are formed. By interposing the cushion layer, it is possible to secure sufficient elasticity and accurately absorb the impact, and it is possible to obtain an artificial lawn-made ground having a playing feel similar to the soil surface.

[Brief description of drawings]

The drawings exemplify the artificial lawn ground of the present invention. FIG. 1 is a developed perspective view showing the first embodiment, FIG. 2 is a sectional view thereof, and FIG. 3 is a sectional view showing a second embodiment. , 4th
FIG. 5 is a sectional view showing a third embodiment, FIG. 5 is a sectional view showing a fourth embodiment, FIG. 6 is a sectional view showing a fifth embodiment, and FIG. 7 is a sectional view showing a sixth embodiment. is there. DESCRIPTION OF SYMBOLS 1 ... Base material, 2 ... Reinforcing layer 3, ... Reticulate body, 4 ... Elastic particle body, 5 ... Artificial lawn, 7 ... Surface layer material, 8 ... Sand layer, 9 ... Nonwoven fabric, 10 ... Woven fabric

Claims (1)

[Claims] 1. A tertiary consisting of a mountain portion and a valley portion, which is formed by three-dimensionally cross-bending a large number of resin filaments between a flat base material and at least a surface layer material formed by artificial grass. A cushion layer composed of a net-like body in which the original voids are formed in a substantially regular manner and an elastic particle filled in the three-dimensional voids of the net-like body is interposed, and the net-like body has a single yarn diameter of 0.2 to 3 mm, The area weight per thickness is set to 0.3 g / cm ³ or less and the porosity is set to 95% or more, while the elastic particles are mainly set to a particle size of 1 to 5 mm and a packing density of 0.3 to 0.8 g / cm ^3. An artificial lawn ground that is characterized by being.