JPH0259242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to artificial turf, and more particularly to an athletic field made of sand-containing artificial turf suitable for golf course greens.

Sand-filled artificial grass is made by filling sand into the grass grains.
Recently, it has been used for golf course greens because it has a characteristic and appearance similar to that of natural grass. In this case, the spike
In order to make the green feel as soft as natural grass when stepped on, European and American artificial grass golf courses use a method of laying plastic foam under the artificial grass. However, with this configuration, the ball does not bounce much and stops relatively well for so-called approach shots hit from a relatively short distance, but for long shots hit from a relatively far position such as tee ground or fairway, the ball stops relatively well. It has been pointed out that the ball bounces too much and does not stop as desired.

This invention was made in view of the above-mentioned drawbacks of the conventional art.The purpose of this invention is to provide a flexible feel close to natural grass when stepped on with spike shoes, and to provide a golf ball that is hit from all distances near and far. To provide an athletic field made of artificial grass containing sand, which is improved so as to be able to perform almost the same behavior as a green made of natural grass, and is particularly suitable for the green of a golf course.

That is, this invention consists of a bulky striated structure intertwined like loofah fibers between a base having a substantially smooth upper surface and a sand-containing artificial lawn laid on the base. It is characterized by interposing an elastic mat and filling the voids of the elastic mat with sand to a predetermined thickness, making use of the appropriate combination effect of the cushioning effect inherent in sand and the repulsion effect of the elastic mat. This aims to achieve the above objectives.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

Referring to FIG. 1, this artificial turf athletic field includes a base 1 having a substantially smooth upper surface. In this case, the base 1 may be a permeable structure made of chestnut stone, crushed stone, etc., or may be a non-permeable structure made of concrete, asphalt, etc. In addition, as long as the upper surface is formed smoothly, the base plate 1 may have a slight inclination. This base 1
An artificial lawn 2 is laid on the base 1, and the grains of the grass are filled with fine-grained sand 3. In this invention, prior to laying the artificial lawn 2, an elastic mat 4 is laid on the base 1. is placed. The elastic mat 4 is made of a bulky striated structure intertwined like loofah fibers. For example, by injecting gas into urethane foam and burning the gas, each membrane of the foam is melted and condensed. At the very least, it is possible to create tangled nylon by bundling nylon filaments formed by a gas flame burning method with a reticulated skeleton as shown in Figure 2, or by a melt-spinning method commercially available under the trade name Nylon Scrubber. It is preferable to use a plastic mat having a network skeleton structure such as loofah fibers by bonding the intersecting parts of the threads. FIG. 3 shows a modification of the elastic mat 4 in which the latter net-like skeleton structure 5 is integrally implanted on a sponge-like substrate 6. Furthermore, as the elastic mat 4, it is also possible to use a material made of thin metal wires intertwined in a bulky manner, such as a wire scrubber.

In any case, it is desirable that the elastic mat 4 has a porosity of 90% or more, and the pores are filled with fine-grained sand. It is designed to provide an appropriate combination effect with repulsion. Therefore, when applied to the green of a golf course, by adjusting the amount of sand filled into the voids of the elastic mat 4, the bounce characteristics of the golf ball can be easily approximated to those of natural grass. In addition, since the sand is filled in the voids of the elastic mat 4, there is no risk of the sand flowing due to tread pressure, and no footprints will be left on the surface of the artificial lawn 2.

On the other hand, the artificial lawn 2 may be made of known materials, such as polyamide, polyethylene terephthalate, polyurethane, polyvinylidene chloride,
A slit yarn made by slicing a polypropylene film or the like is used as a pile yarn, or a flat yarn is made by passing it through a nozzle having irregular cross-sectional holes using a melt spinning method, and this is implanted as a pile yarn on the backing base fabric 7. preferable. The sand 3 to be filled into the artificial lawn 2 and the sand to be filled into the voids of the elastic mat 4 are desirably fine silica sand of size 5 to 8.

As is clear from the description of the embodiments described above, according to the present invention, an elastic pine having a bulky network skeleton structure such as loofah fiber is laid on the underside of the sand-containing artificial lawn, and sand is poured into the voids of the elastic pine. The moderate combined effect of the elastic action of the filling and the elastic action of the pine and the cushioning action of the sand provides an athletic field that exhibits properties more closely resembling natural grass.

In the above embodiments, the case where the green of a golf course is constructed has been explained, but the present invention is not limited to this, and can of course be applied to, for example, a baseball field, a soccer field, a hockey field, etc. be.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a part of the athletic field according to the present invention, Fig. 2 is an enlarged view showing the network skeleton structure of the elastic pine shown in Fig. 1, and Fig. 3 is a deformation of the elastic pine. It is a perspective view showing an example. In the figure, 1 is a base, 2 is an artificial lawn, 3 is sand, and 4 is an elastic pine.

Claims (1)

[Scope of Claims] 1. An artificial grass athletic field comprising an artificial grass laid on a substantially smooth base and sand filled in the grains of the artificial grass, comprising: An artificial lawn exerciser characterized in that an elastic pine consisting of a bulky striated structure intertwined with loofah fibers is interposed between the and the artificial lawn, and the voids of the elastic pine are filled with sand. Arena.