JP6849453B2 - Artificial lawn - Google Patents

Description

The present invention relates to an artificial lawn capable of continuously suppressing a temperature rise at an installation site for a long period of time.

Artificial lawns are often used not only in stadiums where sports such as ball games and athletics are played, but also in relaxing spaces such as parks and rooftops. Various artificial lawns provided with a filling layer have been proposed.

For example, Patent Document 1 states that a lawn or lawn primary layer of mat is laid on which multiple blades of artificial material are woven to form the blades projecting from one side of the mat that creates the lawn: said blades. A filler placed in between, said filler containing a measurement of coarse product obtained from a raw material based on finely crushed coconut; an artificial lawn containing; said coarse product to finely crushed coconut. By essentially containing a single granular and fibrous portion contained in the base material, the granular and fibrous portion undergoes a step of separating the granular and fibrous portion from the powder portion of the raw material based on finely crushed coconut. The granular and fibrous portions obtained and contained in the coarse product are obtained by sieving the raw material based on finely ground coconut, the granular and fibrous portions up to 90% by weight 500 microns (μm). ) An artificial lawn, characterized by having the above particle size distribution, has been proposed.

Special Table 2010-523855 Gazette

The artificial turf described in Patent Document 1 is provided so as to obtain good drainage by adjusting the particle size distribution of a coconut-based raw material that suppresses overheating of the artificial turf, but the sunlight is strong, etc. When the coconut-based raw material dries due to factors, there is a risk that the effect of suppressing the temperature rise will be reduced at an early stage.

The present invention provides an artificial lawn that can maintain the effect of suppressing the temperature rise at the laying site for a long time.

In order to achieve the above object, the present invention has the following configuration.
That is, the artificial lawn according to the present invention is an artificial lawn in which turf threads are planted on a base cloth and a filler is filled between the planted turf threads to provide a filling layer.
The filling layer includes a lower layer containing a coconut filler which is a pulverized product of natural palm, and a surface layer arranged above the filling layer.
The filler constituting the surface layer is a particle having a solar reflectance larger than the solar reflectance of the palm filler in a state where water is retained to the limit, and the surface layer provided so as to cover the lower layer. It is characterized in that the rapid drying of the palm filler is suppressed.

According to the artificial lawn according to the present invention, since the filling layer filled between the turf threads contains a palm filler based on natural palm, the moisture contained in the palm filler is vaporized when the temperature rises. The effect of suppressing the temperature rise due to the heat of vaporization can be obtained.
Further, since the lower layer containing the palm filler and the surface layer to be arranged above the filler are provided, the palm filler contained in the lower layer is less likely to come into direct contact with the outside air, and its rapid drying is suppressed. The effect of suppressing temperature rise can be maintained for a long time.
Further, since the surface layer is mainly formed of a filler having a solar reflectance larger than that of the palm filler, the temperature rise of the palm filler contained in the lower layer can be suppressed even when exposed to strong sunlight. It is possible to suppress the rapid drying due to the temperature rise and maintain the temperature rise suppressing effect for a long time.

Further, if the surface layer is arranged so as to be in contact with the lower layer, the palm filler contained in the lower layer is arranged near the surface of the filling layer, so that the effect of suppressing the temperature rise by the lower palm filler can be obtained. It can be preferably obtained.
Further, since the surface layer is provided so as to cover the lower layer, direct contact of the coconut filler contained in the lower layer with the outside air is further suppressed, and the temperature rise suppressing effect can be maintained for a long time, which is preferable.

Further, if the surface layer is formed only of a filler having a higher solar reflectance than the palm filler, the temperature rise of the palm filler contained in the lower layer can be more effectively suppressed when exposed to strong sunlight. This is preferable because the effect of suppressing temperature rise can be maintained for a long time.

Further, if the surface layer is formed of a filler containing elastic particles formed of an elastic material, the elastic particles of the surface layer are elastic when a force is applied by a person stepping on the filler layer. It is preferable because the palm filler contained in the lower layer is less likely to move to the surface of the filler because it is deformed to reduce the transmission of force to the lower layer and suppress the movement of the filler in the lower layer. ..

According to the artificial lawn according to the present invention, the effect of suppressing the temperature rise at the laying place can be maintained for a long time.

It is sectional drawing which shows one Embodiment of the artificial lawn which concerns on this invention. It is a table of the result of measuring the surface temperature of the artificial lawn, and the graph.

An embodiment of the present invention will be specifically described with reference to the drawings.
The upper surface of the foundation layer 1 is formed to be a flat surface by placing asphalt concrete or permeable concrete on the ground.
The foundation layer 1 may be made of a water-permeable material such as water-permeable concrete, and may be provided so as to have water-permeable property and drain rainwater or the like flowing from above downward, or a non-water-permeable material such as asphalt concrete. It may be formed using a material, and a drainage groove or the like may be formed on the upper surface thereof so as to drain rainwater or the like from above in the lateral direction. Is also good.

2 is an artificial lawn.
In the artificial lawn 2, a plurality of turf threads 21 are planted on the front surface side of the base cloth 22, and a backing material 23 for fixing the turf threads 21 is provided on the back surface side of the base cloth 22.
A filling layer 24 filled with a filler is provided between the planted turf threads 21.

In the artificial lawn 2, a polyethylene monofilament turf thread 21 is planted in a cut pile shape on a base cloth 22 using a plain weave woven cloth made of polypropylene to form turf leaves, and the turf leaves are formed on the back surface of the base cloth 22. A backing material 23 such as urethane resin is applied to fix the planted portion of the turf thread 21.
The artificial lawn 2 uses a polypropylene woven cloth for the base cloth 22, but the present invention is not limited to this, and known materials such as woven fabrics, knitted fabrics, and non-woven fabrics in which the turf thread 21 can be planted can be used.
Further, the artificial lawn 2 uses a polyethylene monofilament for the turf thread 21, but the present invention is not limited to this, and the thickness, material, shape, etc. of the thread may be appropriately selected and used, for example, a polyethylene split yarn. May be planted as turf thread 21, or turf thread 21 of another material or thickness may be used.

The filling layer 24 has a three-layer structure including a surface layer 24a arranged on the surface of the artificial lawn, a lower layer 24b arranged so as to be in contact with the surface layer 24a, and a bottom layer 24c arranged below the lower layer. It is provided.
The filler constituting the filler layer 24 includes hard particles, elastic particles elastically deformed when subjected to an external force, and a coconut filler based on natural palm.
Specifically, the surface layer 24a is composed of only elastic grains, the lower layer 24b is composed of a mixture of hard grains and a coconut filler, and the bottom layer 24c is formed of only hard grains.

The packed bed 24 uses styrene resin-based elastomer granules as elastic particles, but is not limited to this, and other synthetic resin elastomers such as olefin resin-based elastomers, synthetic rubber and natural rubber granules, and waste. Recycled products such as crushed rubber products may be used alone or in combination.

The packed bed 24 uses silica sand as the hard particles, but is not limited to this, and hard granules such as pebbles and sand other than silica sand, pottery grains, and resin pellets may be used alone or in combination. Is also good.

The coconut filler uses a crushed natural coconut, and specifically, is a mixture of granules, powder, and fibers obtained by crushing coconut nuts. Even if the size of the granules of the coconut filler is large, it is formed to a size of about 5 mm.

The palm filler retains rainwater, water supplied by sprinkling water, etc., and vaporizes when the temperature rises, and suppresses the rise in the surface temperature of the artificial lawn by the heat of vaporization. By incorporating the palm filler into the packing layer 24, the temperature of the place where the artificial lawn is laid can be effectively lowered, especially in the summer when the temperature tends to rise, and the occurrence of heat stroke can be suppressed.

The surface layer 24a is formed so as to cover the lower layer 24b, and suppresses direct contact between the palm filler contained in the lower layer 24b and the outside air.
Therefore, it is unlikely that the coconut filler in the lower layer 24b is exposed to wind or the like and the moisture retained in the water is rapidly vaporized and dried, and the temperature rise suppressing effect of the coconut filler can be maintained for a long time.

Further, the surface layer 24a is formed only of elastic particles.
Therefore, when a person walks on the artificial lawn 2, a ball or the like bounces off, and the filling layer 24 of the artificial lawn 2 receives an external force from above, the elastic particles are elastically deformed to the surface. The external force received by the layer 24a can be relaxed, and the transmission of the force to the filler below the lower layer 24b can be suppressed.
As a result, the situation in which the coconut filler contained in the lower layer 24b moves in the filling layer 24 due to the external force is less likely to occur, and the coconut filler moved from the lower layer 24b is exposed to the surface of the packing layer 24. Problems are less likely to occur.
The surface layer 24a is formed only of elastic particles, but is not limited to this, and may contain other fillers such as hard particles or may be formed only of other fillers. However, in order to suppress the movement of the coconut filler in the lower layer 24b, it is preferable that the surface layer 24a contains 50% by volume or more of elastic particles, and it is more preferable that the surface layer 24a is formed of only elastic particles.

The filler made of elastic particles forming the surface layer 24a is formed so that its solar reflectance is larger than that of the palm filler.
As a result, even when the packed bed 24 is exposed to strong sunlight, the temperature of the surface layer 24a rises, the temperature of the lower layer 24b rises, and the problem of rapidly drying the coconut filler of the lower layer 24b can be less likely to occur. ..
The surface layer 24a is formed only of a filler having a higher solar reflectance than the palm filler, but the present invention is not limited to this, and the surface layer 24a may contain a palm filler, and the surface may be contained. The layer 24a may contain a filler having a lower solar reflectance than the coconut filler. However, in order to suppress the drying of the coconut filler in the lower layer 24b and continue the effect of suppressing the temperature rise for a long time, the surface layer 24a contains 50% by volume or more of the filler having a higher solar reflectance than the coconut filler. It is more preferable that the surface layer 24a is formed only of a filler having a higher solar reflectance than the palm filler.

Hereinafter, Example 1 of the artificial lawn 2 according to the present invention will be described.
The upper surface of the base cloth 22 in which the turf yarn 21 is planted in a cut pile shape is filled with silica sand, which is a hard grain, to a thickness of 10 mm to form the bottom layer 24c.
A palm filler is filled on the bottom layer 21c to a thickness of 10 mm, and silica sand is further filled on the bottom layer to a thickness of 8 mm, and a brush is pressed from above to mix them to form the lower layer 24b. To do.
The upper surface of the lower layer 24b was filled with elastic particles formed of granular styrene resin-based elastomer to a thickness of 12 mm to form a surface layer 24a, and the artificial lawn 2 of Example 1 was provided.

The comparative example 1 of the artificial lawn 2 will be described below.
The bottom layer 24c is formed by filling the upper surface of the base cloth 22 in which the turf yarn 21 is planted in a cut pile shape with silica sand, which is a hard grain, to a thickness of 10 mm.
A palm filler is filled on the bottom layer 24c to a thickness of 10 mm, and silica sand is further filled on the bottom layer 24c to a thickness of 20 mm, and a brush is pressed from above to mix them to form the lower layer 24b. Then, the artificial lawn 2 of Comparative Example 1 having no surface layer 24a was provided.

The method for measuring the solar reflectance of the filler constituting the filler layer 24 of the artificial lawn 2 will be described below.
First, the spectral reflectance of the coconut filler contained in the lower layer 24b and the elastic particles forming the surface layer 24a was measured. The spectral reflectance was measured by using an ultraviolet / visible / near-infrared spectrophotometer UV-3150 manufactured by Shimadzu Corporation, and the spectral reflectance in the wavelength range of 220 to 2600 nm was measured at 1 nm intervals. The spectral reflectance was measured with a sample in which a quartz cell was densely filled with a filler.
Using the above measurement data, the solar reflectance was calculated for two wavelength ranges of the near infrared region (300 nm to 780 nm) and the entire wavelength region (300 nm to 2500 nm) by a method based on JIS k 5602: 2008.
Two samples were prepared for each filler, the solar reflectance was calculated for each, and the average value was taken as the solar reflectance of each filler.

When the solar reflectance of the coconut filler contained in the lower layer 24b of Example 1 and Comparative Example 1 was measured based on the above method, the solar reflectance in the near infrared region was 48.8%, and the solar reflectance in the entire wavelength range was measured. The measurement result that the rate was 26.3% was obtained.
Further, when the solar reflectance was measured using the palm filler wet with water and retained to the limit as a sample, the solar reflectance in the near infrared region was 39.0%, and the solar reflectance in the entire wavelength range was measured. Was 21.0%.
Then, when the solar reflectance of the elastic particles forming the surface layer 24a was measured, the results were obtained that the solar reflectance in the near infrared region was 61.4% and the solar reflectance in the entire wavelength region was 43.8%. .. That is, the surface layer 24a of the first embodiment is formed of a filler having a higher solar reflectance than the palm filler contained in the lower layer 24b.

The temperature measurement methods of Example 1 and Comparative Example 1 of the artificial lawn 2 will be described below.
For each of the artificial lawns 2 of Example 1 and Comparative Example 1, a sample having a size of 30 cm in length and 30 cm in width was prepared, and water was sprayed on the upper surface thereof at a ratio of 1 liter / square meter using a sprayer.
The upper surface of the sample was heated by irradiating it with the light of a 500 W halogen lamp from diagonally above the wet sample. The halogen lamp for heating the sample was arranged at a position 35 cm away from the upper surface of the sample so that the center of the light was at an angle of 65 degrees with respect to the center of the upper surface of the sample.
The surface temperature of the sample was measured at 10-minute intervals from the start of irradiation with the light of the halogen lamp. For the measurement of the sample surface temperature, the average value of the surface temperature was measured using the thermography FSV-7000S manufactured by Apiste, which was placed directly above the sample.

The results of measuring the surface temperature of the artificial lawn 2 of Example 1 and Comparative Example 2 by the above method are as shown in the table and graph of FIG.
The surface temperature of Example 1 was higher than that of Comparative Example 1 from the time when the heating to irradiate the light was started until 10 minutes passed, and this was due to the palm filler exposed on the surface of the packing layer 24 of Comparative Example 1. It is considered that this is due to the effect of suppressing temperature rise.
On the other hand, it was confirmed that the surface temperature of Example 1 was reversed after 12 minutes had passed since the start of heating, and that Example 1 had a lower surface temperature than Comparative Example 1. Further, the state where the surface temperature of Example 1 is lower than that of Comparative Example 1 is maintained from 20 minutes to 60 minutes after the start of heating, and the temperature rise suppressing effect of the packed bed 24 of Example 1 is maintained for a longer period of time. It was confirmed that it was done.

The artificial lawn 2 according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, the bottom layer 24c may be formed by selecting or combining a palm filler, elastic grains, or hard grains instead of hard grains.
Further, instead of providing the lower layer 24b by mixing palm-filled grains and hard grains, other hard grains or elastic grains may be selected or combined and mixed with palm-filled grains, and is formed only by the palm-filled material. You may let me.
Although another layer not containing the palm filler may be provided between the surface layer 24a and the lower layer 24b containing the palm filler in the packing layer 24 of Example 1, the effect of suppressing the temperature rise by the palm filler can be obtained. In order to obtain it efficiently, it is preferable that the lower layer 24b in contact with the surface layer 24a contains a coconut filler.

Further, the filling layer 24 of the artificial lawn 2 of the first embodiment is provided in a three-layer structure including a bottom layer 24c, a lower layer 24b, and a surface layer 24a, but is not limited thereto. For example, it may be provided in a two-layer structure that does not include the bottom layer 24c, or may be provided in a structure of four or more layers that forms the bottom layer 24c in two or more layers.

1 Foundation layer 2 Artificial lawn 21 Turf thread 22 Base cloth 23 Backing layer 24 Filling layer

Claims (4)

An artificial lawn in which turf threads are planted on a base cloth, and a filler is filled between the planted turf threads to provide a filling layer.
The filling layer includes a lower layer containing a coconut filler which is a pulverized product of natural palm, and a surface layer arranged above the filling layer.
The filler constituting the surface layer is a particle having a solar reflectance larger than the solar reflectance of the palm filler in a state where water is retained to the limit, and the surface layer provided so as to cover the lower layer. An artificial lawn characterized in that rapid drying of the palm filler is suppressed. The artificial lawn according to claim 1, wherein the surface layer is arranged so as to be in contact with the lower layer and is provided so as to cover the lower layer. The artificial lawn according to claim 1 or 2, wherein the surface layer is formed only of a filler having a higher solar reflectance than the palm filler. The artificial lawn according to any one of claims 1 to 3, wherein the surface layer is formed of a filler containing elastic particles formed of an elastic material.

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