JPH05171612A - Athletic ground made of artificial turf - Google Patents

Abstract

PURPOSE:To obtain an athletic ground made of sand-free turf for preventing damage by falling down by a method in which the sand layer of the ground is covered with pile yarns formed by crimping or high-twisting to a length as much as about two times the thickness of a given thickness of sand layer and having an increased surface area per length of upper half portion of artificial turf with sand. CONSTITUTION:The pile yarns 4 of an artificial turf 3 forming the packed layer 7 of sand having a thickness of 6mm or more are projected by 6mm or more from the surface of the packed layer 7 by increasing the surface area per the projected length of the yarn 4 compared to that in the sand layer. Also, the yarn 4 is subjected to crimping or high-twisting process for regulating its surface area. The packed layer 7 is covered with the upper half of the yarns 4 in such a way that damage such as scratch by falling down and change with time in rolling of balls are reduced and ball game such as soccer can also be permitted. The artificial turf with or without sand can thus be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an athletic stadium made of artificial lawn in which a large number of fillers having a fine particle size are filled in the grass.
More specifically, the present invention relates to an artificial lawn athletic field improved so that the rolling of the ball does not change even when used for a long period of time and the spikes of a running player do not lock.

[0002]

2. Description of the Related Art In all-weather stadiums for ball sports such as tennis, baseball, soccer, and hockey, and in grounds, parks, plazas, etc., a synthetic resin yarn such as nylon or polypropylene is densely packed as a base material for the surface material. Artificial lawn planted in (in the following, referred to as sandless artificial lawn) or artificial lawn in which the spacing between the yarns is made slightly wider and a filling material such as sand is put in the grass grain (hereinafter referred to as sand-containing artificial lawn). ) Is widely used.

A sandless artificial lawn has a base cloth with a length of 6 to 14
The densely planted mm mm yarns do not impair the cushioning characteristics even after long-term use, the rolling performance of the ball does not change over time, and scratches can occur even if a player falls. Although it has the advantage of not being present, it is slippery and, when sliding, may cause burns due to friction with the surface yarn. In addition, in the case of a baseball game where metal spike shoes are used, the artificial lawn is damaged and the use of metal spike shoes must be restricted. Further, since the yarn and the base cloth are only used, the cushioning property at the time of landing of the athlete is hard, and the player feels fatigue when playing for a long time. In order to improve this, it is also proposed to arrange a cushioning layer composed of rubber chips or urethane resin chips on the bottom surface of the base cloth, but this is a local deformation that only the landing point of the athlete is deformed, and the feeling of fatigue. The current situation is that it has not been completely improved.

On the other hand, the artificial lawn with sand is coarser than the artificial lawn without sand, and the artificial lawn is planted more coarsely, and a filling material such as sand or silica sand having a fine particle diameter is filled to a layer thickness of 13 to 30 mm. , Artificial lawn has its leaf tip 1 to 5 m from the surface of the packed bed
It is projected. Therefore, moisture such as rain or water sprinkling is sucked into the packed bed, and the water drainage of the yarn is much better than that of the sandless artificial lawn, and the weight of the yarn is small. In addition, since sandless artificial grass has a light weight, it is fixed to the base by adhesion, etc.
Since it is 30 kg / square meter, it can be laid on a base and can be constructed at an advantage that the construction cost can be reduced. Furthermore, since the filler layer is also exposed to some extent, it is possible to prevent burns due to yarn during sliding, and when the athlete lands, the filler layer changes to a plate-like shape and has a surface cushioning effect.
Better cushioning properties than sandless artificial grass. For these reasons, athletic stadiums with artificial grass containing sand are becoming widespread.

In the case of this artificial grass containing sand, the yarn is planted on the base fabric so that the grass is formed in a substantially upright direction, so that the sand is easily moved and the yarn is used for a long time. The sand may be unevenly distributed, and it is often necessary to scrape the sand evenly by brushing or the like. In order to improve this drawback, it is proposed, for example, in JP-A-1-131628 and Japanese Utility Model Laid-Open No. 2-116507 that the yarn is crimped by a known compression shaping process or a thermal gear shaping process. Has been done. Since the crimped yarn curls in multiple directions, there is no turfing in a certain direction.Since the sand is held in the curl part, the sand does not move much and the hardening of the sand can be reduced. It has the advantage of easier sand maintenance than a conventional artificial lawn.

[0006]

However, the artificial grass containing sand has a drawback that scratches are liable to be caused by the filler exposed on the surface when sliding, and the filling layer is cured due to aging and the buffering property is further deteriorated. May deteriorate or metal spikes may become trapped and locked in the hardened packed bed. In addition, while ball games such as tennis that handle bouncing balls are not so affected, in the case of ball games that handle rolling balls such as soccer, hockey or rugby, the balls roll faster when the filling layer hardens due to aging. It was also pointed out that the competitors were likely to be scratched by tackles, and even if crimped yarns were used, they were considered unsuitable for such ball games.

Therefore, an object of the present invention is to provide an athletic field made of artificial grass which has the characteristics of a sandless artificial grass and which improves the above-mentioned drawbacks of the sand-containing artificial grass and is also suitable for ball games such as soccer. It is to be.

[0008]

SUMMARY OF THE INVENTION The present invention is an artificial lawn exercise in which an artificial lawn is laid on a base cloth, and a lawn of the artificial lawn is filled with a filler composed of sand or synthetic resin having a small particle size. In the stadium, the artificial lawn is composed of synthetic resin pile yarn, and the surface area per length of the pile yarn located in the packing layer is smaller than the surface area per length of the pile yarn located on the packing layer. It is characterized by that.

The present invention also uses a crimped or strongly twisted pile yarn, and the degree of crimp or strong twist in the filling layer is weaker than that of the artificial lawn located on the filling layer. However, the surface area is adjusted accordingly.

[0010]

The surface area per length of the pile yarn located in the packing layer is smaller than the surface area per length of the pile yarn located on the packing layer, so that the pile yarns located in the packing layer are rough. Thus, the filling can be filled uniformly and with high density. Also, since the surface area of the yarn exposed on the filling layer that is the leaf tip of the artificial lawn is high, the upper surface of the filling layer can be covered with the leaf tip, for example, even when the athlete slides. Since it is possible to prevent scratches caused by objects and the ball also rolls on the tip of the leaf, there is little change in the rolling time of the ball during hockey competitions, etc. It is also possible to perform ball games such as. Further, the yarn exposed from the filling layer serves as a cushion layer, and the amount of spikes entering the filling layer is reduced accordingly, and the spikes can be prevented from locking.

Further, the pile yarn is crimped or strongly twisted so that the degree of crimping or strong twist located in the filling layer is weaker than that of the artificial lawn located on the filling layer. For example, the yarn itself becomes elastic due to crimping and strong twisting, the filler is shaken and hard to be hardened even after long-term use, and the holding effect of the filler can reduce the frequency of operations such as sand leveling.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Throughout the embodiments, substantially the same constituent elements are designated by the same reference numerals, and duplicate description will be omitted.

First, the first embodiment shown in FIG. 1 will be described. An artificial lawn 3 is laid via a cushioning material 2 on a base 1 whose upper surface is formed to be substantially smooth. The base 1 may have a water-permeable structure such as cobblestone or crushed stone, or a non-water-permeable structure such as concrete or asphalt.
The cushioning material 2 is laid on the base 1 by placing a foamed material such as a rubber chip or urethane or polyethylene at a construction site, or laying flat molded products. The artificial grass 3
Flat straight bristle split yarn and monofilament yarn made of synthetic resin such as nylon, polyamide, acrylic, vinylidene chloride or polypropylene are used for stuffing method, air jet method, compression or heat gear or knit de- A large number of crimped yarns 4 crimped by a shaping method using a knit or the like are laid on a backing base cloth 5 by tufting or the like at intervals similar to those of a conventional sand-containing artificial lawn. Each crimped yarn 4 is at least 12 mm from the backing backing fabric 5.
It is set to a length sufficient to project above. The turf of the artificial lawn 3 is filled with a filler 6 made of sand having a fine particle diameter, silica sand, elastic granular material of polymer material, or a mixture thereof as the sand. When filling the filling 6, for example, a sand spraying device with a rotating brush as shown in Japanese Patent Publication No. 63-53324 is used, and the crimped portion of the crimped yarn 4 is set upright with the rotating brush. The filling 6 is filled. As a result, the crimped yarn 4 becomes in a stretched shape, and when the filling material 6 is filled in this state, the crimped yarn 4 in this portion is restrained by the filling material 6 and holds the stretched state. On the other hand, since the crimped yarn 4 exposed on the filling layer 7 is not constrained by the filling material 6, the crimp strength is restored with time and returns to the original state.
The crimped portion of the crimped yarn 4 in the packing layer 7 is in an elongated shape, and the surface area per length of the yarn 4 in this portion is located on the packing layer 7 and exposed. Less than 4 surface areas per length. The layer thickness of the filling layer 7 is at least 6 mm or more from the upper surface of the backing base fabric 5, and each crimped yarn 4 is 6 from the upper surface of the filling layer 7 to its end.
The crimped yarn 4 in the filling layer 7 is stretched as described above, though it depends on the crimp strength, but the crimped yarn 4 has a length of 5 mm or less in the crimped state. Can be planted on the backing base cloth 5.

As a result, the basis weight of the crimped yarn 4 of the artificial lawn 3 can be reduced like the conventional artificial sand lawn containing sand, and the crimped yarn 4 in the filling layer 7 is extended, so that the crimped state is filled. It can be shorter than it is located in the layer 7, and the amount of the crimped yarn 4 used can be reduced. Further, the small amount of the crimped yarn 4 located in the filling layer 7 enables the filling material 6 to be uniformly and densely filled. When the filling layer 7 has a layer thickness of at least 6 mm, when the filling material is silica sand, the weight of the sand is about 8 kg / square m, and the artificial lawn 3 is laid on the base 1 to be laid by the construction work. Since it is exhibited, the construction cost can be reduced. Further, the surface load characteristics are generated by the filling layer 7, and the synergistic effect with the cushioning material 2 in the lower layer can improve the feeling of landing when the athlete lands. Furthermore, since the filling material 6 can be filled with high density, drainage is improved, and the filling material 6 can be used in an outdoor sports field.

On the other hand, since the crimped yarn 4 which is the tip of the leaf of the artificial lawn 3 is projected at a high density in the crimped state from the upper surface of the packing layer 7 by 6 mm or more, the cushioning property and the sag resistance are improved. You can As a result, the surface of the filler layer 7 is covered with the leaf tips, and for example, even if the athlete slides, it is possible to prevent the occurrence of scratches due to the filler,
Further, the elasticity of the crimped yarn 4 itself shakes the sand, which makes it difficult to cure even after long-term use, and the holding effect of the filler 6 can reduce the frequency of operations such as sand leveling. Since the upper surface of the filling layer 7 is covered with leaf tips and the balls also roll on the leaf tips, the rolling change of the balls in hockey competitions, etc. is small and it is considered unsuitable for sand-filled artificial lawns. You can also play ball games such as hockey and soccer. In addition, the crimped yarn 4 protruding from the filling layer 7 serves as a cushion layer, and the amount of spikes entering the filling layer 7 is correspondingly small, so that the spikes are hard to lock.

In the above-mentioned embodiment, the pile yarn is composed of the crimped so-called yarn, but the twisted yarn may be used instead of the crimped yarn. In this case, after the strongly twisted yarn is planted in the backing base fabric 5, the filling 6 is filled to a predetermined thickness in the strongly twisted state, and the rotating brush is often applied to the strongly twisted yarn exposed on the filling layer 7. The pile strength in the strongly twisted state is scattered to reduce the twisting strength. As a result, the yarns in the packing layer 7 are in close contact with each other and have a small surface area as a whole, but the yarns exposed on the packing layer 7 are scattered, so that the surface area is in a strongly twisted state. Can be larger than the part.

In the second embodiment shown in FIG. 2, attention is paid to the fact that the crimping degree of the above-mentioned synthetic resin such as nylon, polyamide, acryl, vinylidene chloride or polypropylene constituting the yarn can be adjusted by the amount of heat applied. The surface area in the packing layer 7 is reduced by utilizing the latent crimp property.
It is smaller than the exposed part above. That is, a flat straight-hair split yarn or monofilament yarn 11 made of synthetic resin having latent crimping property.
After lining the backing cloth 5 with tufting or the like at a distance similar to that of a conventional artificial lawn containing sand, the filling material 6
To a predetermined thickness. Then, on the yarn 11 projecting above the filling layer 7, a heating roller 12 having an appropriate heating means inside and the surface of which is heated by the heat thereof is rolled. As a result, the yarn 11 projecting on the packing layer 7 is further crimped, and its crimp strength is stronger than that of the yarn 11 in the packing layer 7. As a result, the yarn 1 projecting on the packing layer 7 is obtained.
The surface area of 1 can be larger than the yarn 11 in the packing layer 7. Also in this embodiment, the thickness of the filler layer 7 is set to 6 mm or more, and the length of the yarn 11 protruding on the filler layer 7 is also set to 6 mm or more. It is needless to say that the length of the yarn 11 to be planted in the backing base cloth 5 is set longer in consideration of the amount of crimping and shrinking by the heat roller 12.

[0018]

As described above, in the athletic stadium made of artificial grass of the present invention, the artificial grass is composed of pile yarn made of synthetic resin, and the surface area per length of the pile yarn located in the packing layer is the packing layer. Since the surface area per length of the pile yarn located above is smaller than that of the pile yarn, the packing can be packed uniformly and densely. Also, since the surface area of the yarn exposed on the filling layer that is the leaf tip of the artificial lawn is high, the upper surface of the filling layer can be covered with the leaf tip, for example, even when the athlete slides. Since it is possible to prevent scratches caused by objects and the ball also rolls on the tip of the leaf, there is little change in the rolling time of the ball during hockey competitions, etc. It is also possible to perform ball games such as. Furthermore, the yarn exposed from the filler layer serves as a cushion layer, and the amount of spikes entering the filler layer is reduced by that amount, so that the spikes are hard to lock.

Further, as described in claim 2, the pile yarn is crimped or strongly twisted, and the degree of crimping or strong twist located in the filling layer is that of an artificial lawn located on the filling layer. If you adjust the surface area by making it weaker,
The yarn itself becomes elastic due to crimping and strong twisting, the filler is shaken, and it is difficult to cure even after long-term use, and the holding effect of the filler can reduce the frequency of operations such as sand leveling.

Further, as described in claim 3, the filling is filled so that the layer thickness is at least 6 mm or more,
Artificial grass can reduce the construction cost because the filling layer can be made to have a weight such that it can be laid on a substrate and constructed by making the leaf tips of the artificial lawn protrude from the surface of the layer of the filling by at least 6 mm or more. As a result, a surface load characteristic is generated by the filling layer, and a feeling of landing when the athlete lands can be improved. Further, if a cushioning layer made of an elastic material is provided on the lower surface of the base cloth as in claim 4, the landing feeling can be further improved by the synergistic effect of the surface load characteristics of the filling layer and the lower cushioning layer. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a part of a first embodiment of the present invention.

FIG. 2 is a vertical sectional view schematically showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Buffer material 3 Artificial lawn 4,11 Yarn 5 Lining base cloth 6 Filling material 7 Filling material layer

Claims (4)

[Claims] 1. An artificial lawn athletic stadium in which an artificial lawn is planted on a base cloth and is filled with a filler composed of sand or synthetic resin having a small particle size in the grass of the artificial lawn. The lawn is composed of a pile yarn made of synthetic resin, and the surface area per length of the pile yarn located in the packing layer is smaller than the surface area per length of the pile yarn located on the packing layer. An artificial stadium made of artificial grass. 2. The pile yarn is crimped or strongly twisted, and the degree of crimping or strong twist located in the filling layer is weaker than that of the artificial lawn located on the filling layer. The athletic field made of artificial grass according to claim 1, wherein the surface area is adjusted accordingly. 3. The packing has a layer thickness of at least 6 m.
The athletic field made of artificial lawn according to claim 1 or 2, wherein the artificial lawn is filled so as to have a length of m or more, and the leaf tips of the artificial lawn project at least 6 mm or more from the surface of the layer of the filling. 4. The artificial lawn sports stadium according to claim 1, wherein a cushioning layer made of an elastic material is provided on a lower surface of the base cloth.