JP2007154623A - Artificial turf and method of suppressing high temperature rise of its surface temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent high temperature rise by suppressing increase in surface temperature of artificial turf. <P>SOLUTION: White color paint is coated on a surface of the artificial turf in which a polyethylene artificial turf pile with a length of 65 mm and with a thickness of 2 mm is knitted in a polyethylene net. Sand is laid with a height of 20 mm from a bottom of the polyethylene net of the artificial turf and further rubber chips with a particle diameter of 3-4 mm are installed with a height of 20 mm on the sand. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an artificial turf in which a plurality of artificial turf piles are knitted over the entire surface, and more particularly to a method for suppressing an increase in the surface temperature of an artificial turf and an artificial turf to which the method is applied.

In sports competition facilities, artificial turf is used for the purpose of reducing the load on the legs and legs of the human body or reproducing natural turf. For example, when reproducing a golf course, an artificial turf may use a white artificial turf sheet as a part for reproducing a bunker (see, for example, Patent Document 1). Artificial turf with the same surface color as natural turf is used.
JP-A-6-47122

However, when an artificial turf sports facility is provided outdoors, the artificial turf with a green surface color has a high absorption rate of sunlight, so the surface temperature may rise to close to 65 ° C. in summer. When the surface temperature of the artificial turf becomes high, there is a problem that the comfort of the competition is hindered.
Then, this invention aims at suppressing the high temperature of the artificial turf surface.

  The first artificial turf surface temperature increase suppression method according to the present invention includes at least some artificial turf piles in order to suppress an increase in the surface temperature of the artificial turf in which a plurality of artificial turf piles are knitted over the entire surface. The surface of the glass is subjected to a treatment for reducing sunlight absorption.

One example of a treatment that reduces solar absorption is to coat the surface with a coating of a color that absorbs less sunlight than green.
In this case, various colors can be adopted as the color that absorbs less sunlight than green, and the closer to white, the more preferable, and the extreme case is white that exhibits total reflection.
Another example of a process for reducing sunlight absorption is to coat with a highly reflective coating film.

  The second artificial turf surface temperature suppression method of the present invention is to add a substance that reduces sunlight absorption to the artificial turf pile.

In the artificial turf of the present invention, a plurality of artificial turf piles are knitted by mixing a green artificial turf pile and an artificial turf pile having a color that absorbs less sunlight than green. Also in this case, various colors can be adopted, and the closer to white, the better, and the extreme case is white showing total reflection.
The ratio between the green artificial turf pile and the white artificial turf pile is not particularly limited, and as the proportion of the white artificial turf pile increases, the effect of suppressing the temperature rise increases. As an example, the ratio of the green artificial turf pile and the white artificial turf pile is 2: 1.

  In the first artificial turf surface temperature suppression method according to the present invention, the solar turf absorption rate of the artificial turf is reduced because at least a part of the artificial turf pile surface is subjected to the treatment for reducing the solar absorption. High temperature of the artificial turf surface is suppressed.

If the surface is covered with a coating film having a color that absorbs less sunlight than green as a treatment for reducing sunlight absorption, the temperature of the artificial turf surface can be suppressed by an easy treatment.
If the color of the coating film covering the surface of the artificial turf pile is white, since white is the color with the highest light reflectance, the temperature of the artificial turf surface can be further suppressed.
If the surface of the artificial turf pile is covered with a coating film having a high reflectance, the sunlight absorption rate of the artificial turf is reduced, so that the surface temperature can be prevented from increasing.

  In the second artificial turf surface temperature increase suppression method of the present invention, since the substance that reduces sunlight absorption is added to the artificial turf pile, the increase in the surface temperature can be suppressed.

In the artificial turf of the present invention, a plurality of artificial turf piles are knitted by mixing a green artificial turf pile and a white artificial turf pile over the entire surface. Is reduced, and the increase in surface temperature is suppressed.
In the artificial turf of the present invention, the higher the proportion of the white artificial turf pile woven, the more effective the suppression of the surface temperature is, but it is based on a conventional green artificial turf like a sports competition facility. Considering, weaving a green artificial turf pile and a white artificial turf pile at a ratio of about 2: 1 can suppress the surface temperature from becoming higher than when all the artificial turf piles are green. As well as being able to do so, the feeling of incongruity given to the competition facility is reduced.

The target artificial turf is made by weaving an artificial turf pile on a resin net. Examples of the artificial turf pile material include polyethylene, polypropylene, nylon, and polyethylene terephthalate.
The artificial turf used in the measurement was manufactured by knitting a polyethylene artificial turf pile with a thickness of 2 mm into a polyethylene net so that the density was about 36 / cm ² and the length was 65 mm. At the time of measurement, sand was spread at a height of 20 mm from the bottom of the polyethylene net, and rubber chips having a particle diameter of 3 to 4 mm were further spread thereon at a height of 20 mm. The surface temperature was measured by an infrared temperature measurement method, and the light reflectance was measured using an albedo measuring device (product of Klimatec). All were measured at a position 50 cm from the surface of the artificial turf. “Albedo” refers to the ratio of reflected light energy to externally incident light energy (in this case, sunlight incident energy).

Example 1
The color of normal artificial turf is green, but a paint with high sunlight reflectance was applied to the surface of the artificial turf as a treatment to reduce sunlight absorption. As the paint, it is desirable to use an oil-based paint because an aqueous paint is difficult to fix. The paint used was an oil-based color spray manufactured by Asahi Pen Co., Ltd., white number 85 and black number 88.

  Table 1 shows the surface temperature and sunlight reflectance of artificial turf using artificial turf piles coated with white paint, untreated (green), and black paint.

  As shown in Table 1, the surface temperature of white artificial turf with the highest surface color of solar reflectance is 5 compared to the surface temperature of normal green artificial turf with lower solar reflectance than white. It decreased by 2 ° C. In addition, the surface temperature of the black artificial turf, whose surface color is lower than that of green, has a higher temperature than that of the green artificial turf. From this result, it was found that the increase in the surface temperature of the artificial turf can be suppressed by reducing the sunlight absorption on the surface of the artificial turf. As a means, it has been found that it is effective to make the surface of the artificial turf a color that reduces sunlight absorption, such as white or a color close thereto.

  In Example 1 where the whole is artificial turf of uniform color, instead of applying the paint, it is knitted using an artificial turf pile colored by adding a pigment as used in Example 2 below. Artificial grass may be used.

(Example 2)
A white artificial turf pile produced by adding a white pigment to the artificial turf pile material and a normal green artificial turf pile were mixed and knitted to produce a mixed pile artificial turf and laid. The laid area is 100m x 120m. The mixing ratio may be arbitrarily selected according to the degree of temperature rise suppression and color as desired. Here, the ratio of the white artificial turf pile and the green artificial turf pile is 1: 2. did. When surface temperature was measured using this mixed pile artificial turf and ordinary green artificial turf, the surface temperature of the mixed pile artificial turf was about 2.8 ° C. lower than that of the green artificial turf. In this way, if an artificial turf is manufactured by mixing an artificial turf pile added with a substance that reduces sunlight absorption as a pigment and an ordinary green artificial turf pile, the surface of the artificial turf is more than that of a conventional green pile artificial turf. The increase in temperature is suppressed. And if the knitting ratio of the artificial turf pile added with the substance which reduces sunlight absorption as a pigment is enlarged, the effect which suppresses the further surface temperature increase can be acquired. The closer the artificial turf pile pigment is to white, the greater the effect of suppressing the increase in surface temperature.

  Although white artificial grass is used to form golfer bunker parts and sports court lines, they are used only for a small portion of the facility. Therefore, no attention has been paid to the effect of white artificial turf on the temperature rise, and it can be said that there was no actual effect on the temperature rise. On the other hand, in the present invention, the artificial turf surface with a color that reduces the absorption of sunlight, such as white, is actively used for the entire facility or a large area, thereby reducing the sunlight absorption of the entire artificial turf surface and the surface of the entire artificial turf. The temperature rise is suppressed.

(Example 3)
A comparison was made between the surface temperature of green artificial turf coated with Asahi Pen varnish spray or Aspen lacquer spray as a brightening agent on the surface of artificial turf, and untreated green artificial turf. It was found that the surface temperature of the artificial turf with the brightener coated on the surface was suppressed to be higher than that of the untreated green artificial turf.

  Therefore, artificial turf manufactured using artificial turf with a surface coated with a paint that reduces sunlight absorption, such as white, or an artificial turf pile with a substance that reduces sunlight absorption as a pigment. If the surface of the artificial turf is further coated with a coating film that increases the solar reflectance such as a brightener, the effect of suppressing the surface temperature of the artificial turf can be further enhanced.

  The materials and sizes of artificial turf piles, nets that weave artificial turf piles, and paints applied to the surface of artificial turf piles are just examples, and are made of various materials. May be.

  The artificial turf of the present invention can be used for improving the comfort of competition in various competitions mainly performed outdoors such as soccer, futsal, baseball, athletics, and tennis.

Claims (8)

In order to suppress an increase in the surface temperature of the artificial turf where a plurality of artificial turf piles are knitted on the entire surface, at least a part of the surface of the artificial turf pile is subjected to a treatment for reducing sunlight absorption. To suppress the temperature rise of the artificial turf surface. The artificial grass surface temperature increase suppression method according to claim 1, wherein the treatment is to coat the surface with a coating film having a color that absorbs less sunlight than green. The artificial turf surface temperature increase suppression method according to claim 2, wherein the color is white. The artificial grass surface temperature increase suppressing method according to claim 1, wherein the treatment is coating with a highly reflective coating film. In order to suppress the temperature rise of the artificial turf where multiple artificial turf piles are woven into the entire surface,
The artificial turf surface temperature high temperature suppression method which adds the substance which reduces sunlight absorption to the said artificial turf pile. In artificial turf where multiple artificial turf piles are woven into the entire surface,
Artificial turf characterized by a mixture of green artificial turf pile and artificial turf pile with less sunlight absorption. The artificial turf according to claim 6, wherein the color with little sunlight absorption is white. The artificial grass according to claim 7, wherein the green artificial grass pile and the white artificial grass pile are woven in a ratio of 2: 1.