JP3238758U - Artificial turf and filling material for artificial turf - Google Patents

Abstract

An artificial turf or the like having a function of keeping the surface temperature of the artificial turf at a low temperature is provided.
An artificial turf comprising a base material 3, a plurality of piles 5 imitating lawn leaves erected on the base material, and a filler layer 7 formed by a filler filled between the plurality of piles. 1, wherein the filler layer includes a water-retaining layer and a mineral containing calcium carbonate as a main component, and the filler is artificial turf having rice husks. Further, a mineral layer 9 containing a mineral as a main material is provided between the filler layer and the substrate layer.
[Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to an artificial turf and a filler for artificial turf, and more particularly to an artificial turf or the like having a filler layer filled with a filler between a plurality of piles.

Artificial turf is currently used in various sports facilities. Also, various artificial grasses have been developed. Artificial turf commonly used in soccer fields will be described below.

Conventionally, the natural turf that has been used requires a lot of daily maintenance work such as fertilizing, watering, and repairing. Artificial turf, on the other hand, is easier to maintain. In addition, since it is made of organic polymer compounds, it has excellent durability and can be used for competitions even after it rains.

However, early artificial turf was hard and had poor shock absorption, which put a lot of strain on the knees. In addition, there is a problem that burns and abrasions are likely to occur during sliding.

The history of the development of artificial turf will be described with reference to FIG. FIG. 2 is a cross-sectional view of conventional artificial turf, showing cross-sectional views of (a) first generation, (b) second generation, and (c) third generation artificial turf.

The introduction of artificial turf (first generation) was the first in the world at the Astrodome (baseball stadium) in Houston, USA in 1966. In Japan, it was introduced at Korakuen Stadium in 1976. As shown in FIG. 1(a), the first-generation artificial turf 11 consists of a pile layer 13 and a cushion layer 15 (synthetic polymer foam) called an underpad to ensure the cushioning properties necessary for sports. It has a two-layer structure. A large number of piles 17 forming the pile layer 13 stand up from the cushion layer 15 like a carpet.

It has been pointed out that the first generation artificial grass 11 has a safety problem that burns and scratches are likely to occur during sliding. Furthermore, the flexibility of the underpad causes local dents, which makes it difficult for the player to keep his/her feet firmly on the ground during dashes and jumps, which tends to put a strain on the legs and lower back of the player.

In the 1980s, sand-filled artificial turf appeared as the second generation artificial turf 21 because of the safety and high installation costs of the first generation artificial turf 11 . The second generation artificial turf 21 further includes sand 29 between the piles 27 in addition to the pile layer 23 and the cushion layer 25 . The second generation artificial turf 21 has fewer piles 27 to be woven than the first generation artificial turf 11, and sand 29 is put between the artificial turf, resulting in a lower cost than the first generation artificial turf. It is said to be about 50% cheaper. As a result, it has spread widely to citizen-level baseball stadiums and tennis courts. In addition, the second-generation artificial turf 21 contains sand 29, so that the impact received by the player's feet is transmitted widely downward and is alleviated, so local dents in the underpad are suppressed. . As a result, the problem that players tend to get tired in their legs has been improved.

However, the second-generation artificial turf 21, which has been used for many years and has a hardened sand layer, has another problem that direct impact is likely to be transmitted to the feet and knees during exercise.

In the latter half of the 1990s, the third generation artificial turf 31, commonly known as high-tech artificial turf, appeared. The third generation artificial turf 31 comprises a pile layer 33, a rubber chip layer 35, sand 37 and a base layer 39. The piles that form the pile layer 33 are long piles 41 that are longer than the artificial turf of the first generation artificial turf 11 and the second generation artificial turf 21 . The third-generation artificial turf 31 has a three-layer structure of a base layer 39 , a rubber chip layer 35 and sand 37 with the underpad removed. The rubber chip layer 35 is provided with cushioning properties and is adjusted not to be too soft by adding sand 37. - 特許庁As a result, the deformability during exercise is closer to that of natural grass, and it is devised to reduce injuries.

For example, in Patent Document 1, rubber chips obtained by crushing waste tires, industrial waste materials, etc. are filled as a filler between a large number of piles imitating grass leaves standing on a base material constituting artificial turf. Techniques for improving shock absorption are described.

JP 2018-178499 A

However, when the inventor of the present application measured and compared the surface temperature of natural grass and artificial grass under natural light, the surface temperature of conventional artificial grass exceeded 60°C, which was 20°C or more higher than that of natural grass in some cases. .

FIG. 3 is a diagram showing the isothermal distribution of the surface temperature of a ground using third-generation artificial grass and a ground using natural grass. Figure 3 shows the distribution of surface temperatures near noon on a sunny day in September. In addition, since the wind was coming in from the east (right side of the figure), the surface temperature on the right side of the figure was lowered due to the effect of the wind. In addition, the surface temperature of the 3rd generation artificial turf was about 20°C higher than that of the natural grass as a whole, and in some places it exceeded 60°C.

Thus, there is still room for improvement in order to use artificial turf as a substitute for natural turf. Accordingly, an object of the present invention is to provide an artificial turf or the like having a function of keeping the surface temperature of the artificial turf at a low temperature.

A first aspect of the present invention comprises a substrate, a plurality of piles imitating grass leaves erected on the substrate, and a filler layer formed by a filler filled between the plurality of piles. The artificial turf is an artificial turf in which the filler layer has a water-retaining layer and a mineral containing calcium carbonate as a main component, and the filler has rice husks.

A second aspect of the present invention is the artificial turf according to the first aspect, wherein the rice husk is powdered.

A third aspect of the present invention is the artificial turf according to the second aspect, further comprising a mineral layer containing the mineral as a main material between the filler layer and the base material.

A fourth aspect of the present invention is a filler for artificial turf that is filled between a plurality of piles imitating turf leaves contained in artificial turf, the filler comprising rice husks and minerals mainly composed of calcium carbonate. It is a filling material for artificial turf.

According to each aspect of the present invention, the vaporization of water contained in the water-retaining layer takes away a large amount of heat of vaporization, and moisture is applied to the mineral, making it possible to delay the temperature rise. Therefore, it is possible to provide an artificial turf or the like that has a function of keeping the surface temperature of the artificial turf low. As a result, it is possible to provide highly safe artificial turf by suppressing user burns and heat stroke.

In addition, since it is easy to produce using only domestically produced materials, it is possible to rapidly produce artificial turf and fillers for artificial turf while keeping transportation costs down.

In addition, the rubber chips that form the rubber chip layer used in the third-generation artificial turf are finely crushed car tire recycled products. Tires contain various chemical substances such as zinc oxide, sulfur, and carbon black, and there are reports that benzopyrene, which is considered to be highly carcinogenic, has been detected in rubber chips. According to the third aspect of the present invention, only natural resources are used as fillers without using rubber chips that may cause environmental pollution or health hazards to users, and adverse effects on health of users. can be suppressed.

Further, according to the third aspect of the present invention, the relatively high cushioning filler layer and the relatively hard mineral layer reduce the physical burden on the user and maintain an appropriate repulsive force. It becomes possible.

1 is a cross-sectional view of an artificial turf according to the present invention; FIG. It is a cross-sectional view of a conventional artificial turf, showing cross-sectional views of (a) first generation, (b) second generation, and (c) third generation artificial turf. FIG. 10 is a diagram showing the isothermal distribution of the surface temperature of a ground using third-generation artificial grass and a ground using natural grass.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the embodiments of the present invention are not limited to the contents described below.

FIG. 1 is a cross-sectional view of an artificial turf 1 of the present invention. The artificial turf 1 (an example of "artificial turf" in the claims of the present application) includes a base material 3 (an example of the "base material" in the claims of the present application) and a large number of piles 5 imitating grass leaves standing on the base material 3. (an example of a "pile" in the claims of the present application) and a filler layer 7 (an An example of a "water-retaining layer" and a "filler layer"), and a mineral layer 9 (an example of a "mineral" in the claims of the present application) mainly composed of a mineral (an example of a "mineral" in the claims of the present application) between the substrate 3 and the filler layer 7 An example of "mineral layer" in).

The filler that forms the filler layer 7 contains a plant-derived substance and a mineral containing calcium carbonate as a main component. Dried and powdered rice husks were used as the plant-derived material. Rice husk is the outer skin of the rice seed. Kansui stone quarried at Mt. Koshun in Iizuka City, Fukuoka Prefecture was used as the mineral. Kansuiseki is a white crystalline limestone.

The artificial turf production method for producing the artificial turf 1 is as follows. a pile planting step of planting a large number of piles 5 on the substrate 3; a mineral layer forming step of forming a mineral layer 9 mainly composed of minerals between the numerous piles 5; The artificial turf 1 is produced through a filling material layer forming step of filling a filling material between the piles 5 to form a filling material layer 7 .

For example, the base material 3 is a shock pad of 5-15 mm, the mineral layer 9 is 10-15 mm, the filler layer 7 is 15-30 mm, and the length of the pile 5 above the filler layer 7 is 10 mm. -15mm, and the overall thickness may be about 40-60mm. Further, the thickness of each layer and the total thickness of these layers may be other than those described above, if necessary.

Fillers and minerals can be added later if necessary.

Moreover, as the base material 3, for example, a flexible shock pad is used. A shock pad has a thread-like structure and is capable of retaining a certain amount of moisture. Therefore, the substrate 3 may be used as a water retaining layer instead of the filler layer. Alternatively, it may function as a water retention layer together with the filler layer. At least the heat of vaporization of the moisture retained by the base material 3 can be expected to cool the artificial turf.

The artificial turf 1 of the present invention has impact absorption, durability, and ease of maintenance and management in the same way as conventional artificial turf. It becomes possible to provide the player with a comfortable environment.

In addition, since rice husks are used instead of rubber chips to improve shock absorption, there is no risk of environmental pollution or health hazards. Furthermore, since rice husks are readily available in Japan, it is possible to provide artificial turf etc. of stable quality.

Although powdered rice husks were used as the plant-derived substance, the outer skins of cereals other than rice may also be used. By changing the filling material from rubber chips to grain hulls, it is possible to suppress an increase in the surface temperature. Coconut peat, bark chips of Japanese cypress and Japanese cedar, wood chips and/or sawdust obtained by pulverizing bark may be used as the plant-derived substance, or a mixture of these and cereal husks may be used.

Black rubber chips, which are recycled tires, tend to produce black fine carbon particles, and emit an unpleasant odor when the temperature rises. On the other hand, the bark chips of cypress and cedar give off a scent of wood, giving you a pleasant feeling like forest bathing. Furthermore, bark chips are superior to rubber chips from the viewpoint of resource recycling.

Powder obtained by pulverizing coffee beans may also be used as the plant-derived substance.

1; artificial turf, 3; base material, 5; pile, 7; filler layer, 9; mineral layer, 11; first generation artificial turf, 13; pile layer, 15; 2nd generation artificial turf, 23; pile layer, 25; cushion layer, 27; pile, 29; sand, 31; 3rd generation artificial turf, 33; pile layer, 35; 41; Long pile

Claims (4)

a substrate;
a plurality of piles imitating grass leaves standing on the substrate;
An artificial turf comprising a filler layer formed by a filler filled between the plurality of piles,
The filler layer is
a water-retaining layer;
and a mineral mainly composed of calcium carbonate,
The artificial turf, wherein the filling material has rice husk. The artificial turf according to claim 1, wherein the rice husk is powdered. 3. The artificial lawn according to claim 2, further comprising a mineral layer containing said mineral as a main material between said filler layer and said base material. A filler for artificial turf that is filled between a plurality of piles imitating turf leaves contained in artificial turf,
rice husk and
A filler for artificial turf, comprising a mineral containing calcium carbonate as a main component.

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