JP2018123522A - Artificial lawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial lawn that maintains a temperature rise suppression effect over a long period at a place of installation.SOLUTION: A lower layer and a surface layer are formed in a filler layer having a filler material filled between lawn-like yarns, the lower layer including a palm filler material and the surface layer comprising mainly of a filler material with a solar reflectance greater than the palm filler material. A temperature rise suppression effect brought about by evaporation heat is obtained because the palm filler material is included, as moisture contained in the palm filler material evaporates when a temperature rises. The temperature rise suppression effect may be maintained over a long period, because rapid drying of the palm filler material is prevented as the surface layer inhibits direct contacting by the palm filler material with outside air. Temperature rise of the palm filler material contained in the lower layer may be suppressed even when exposed to strong sunlight, because the surface material is formed by a filler material with a solar reflectance greater than the palm filler material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an artificial lawn capable of continuing a temperature rise suppression at an installation place for a long time.

  Artificial turf is often used in stadiums for sports such as ball games and athletics, as well as resting spaces such as parks and rooftops. Various artificial lawns with a packed bed have been proposed.

  For example, in US Pat. No. 6,057,049, a grass or lawn primary layer comprising a mat, on which a plurality of blades of artificial material are woven to form a blade projecting from one side of the mat creating the lawn: the blade An artificial lawn comprising: a filler disposed between, said filler comprising a measured amount of a coarse product obtained from a raw material based on finely crushed coconut, wherein said coarse product is converted into finely crushed coconut Essentially comprising a single granular and fibrous part contained in the raw material, wherein the granular and fibrous part undergoes a process of separating the granular and fibrous part from the powdered part of the raw material based on finely crushed coconut The granular and fibrous parts obtained and contained in the coarse product are sieved with the raw material based on finely crushed coconut. Obtained, the granular and fibrous part artificial lawn characterized by having a 500 micron ([mu] m) or more particle size distribution up to 90 wt%, has been proposed.

Special table 2010-523855

  The artificial lawn described in Patent Document 1 is provided to adjust the particle size distribution of the raw material based on coconut that suppresses overheating of the artificial lawn so as to obtain good drainage properties, etc. If the raw material based on coconut is dried due to factors, the effect of suppressing the temperature rise may be reduced early.

  This invention provides the artificial lawn which can maintain the temperature rise inhibitory effect of a laying place for a long time.

In order to achieve the above object, the present invention is configured as follows.
That is, the artificial lawn according to the present invention is an artificial lawn in which turf yarn is planted on a base fabric and a filling layer is provided by filling a filler between the planted turf yarns. A lower layer containing a palm filler based on natural palm, and a surface layer disposed on the uppermost side of the filler layer, the surface layer being filled with a solar reflectance greater than the solar reflectance of the palm filler The material is mainly formed.

According to the artificial lawn according to the present invention, since the filling layer filled between the turf yarns includes a palm filler based on natural palm, the moisture contained in the palm filler vaporizes when the temperature rises. A temperature rise suppression effect due to heat of vaporization can be obtained.
Moreover, since the lower layer containing the said palm filler and the surface layer arrange | positioned at the uppermost part of the said packed layer are provided, the said palm filler contained in a lower layer is hard to contact directly to external air, and the rapid drying is suppressed. Temperature rise suppression effect can be maintained for a long time.
Moreover, since the surface layer is mainly formed of a filler having a solar reflectance larger than the solar reflectance of the palm filler, it is possible to suppress the temperature rise of the palm filler contained in the lower layer even when receiving strong sunlight, Rapid drying due to temperature rise can be suppressed and the temperature rise suppressing effect can be maintained 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 packed layer. It can be suitably obtained.
Moreover, since the said surface layer is provided so that the said lower layer may be covered, the direct contact to the external air of the palm filler contained in a lower layer is suppressed more, and the temperature rise inhibitory effect can be maintained for a long time, and it is preferable.

  Moreover, if the surface layer is formed only with a filler having a large solar reflectance than the palm filler, it is possible to more effectively suppress the temperature rise of the palm filler contained in the lower layer when receiving strong sunlight, Since the temperature rise inhibitory effect can be maintained for a long time, it is preferable.

  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 packed layer. It is preferable that the coconut filler contained in this lower layer is less likely to move to the surface of the filling layer, because the deformation is reduced to reduce the transmission of force to the lower layer and suppress the movement of the lower layer filler. .

  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 the table | surface of the result of having measured the surface temperature of the artificial lawn, and its graph.

An embodiment of the present invention will be specifically described with reference to the drawings.
The foundation layer 1 has a flat upper surface formed by placing asphalt concrete or permeable concrete on the ground.
The foundation layer 1 may be provided by using a water-permeable material such as water-permeable concrete, and may be provided so that rainwater flowing from above is drained downward, 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 that rainwater or the like from above is drained laterally. Also good.

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

The artificial lawn 2 is formed by laying a monofilament turf yarn 21 made of polyethylene monofilament in a cut pile shape on a base fabric 22 using a plain woven fabric made of polypropylene, and forming a lawn leaf on the back surface of the base fabric 22. A backing material 23 such as urethane resin is applied to fix the planted portion of the turf yarn 21.
The artificial lawn 2 uses a woven fabric made of polypropylene for the base fabric 22, but is not limited to this, and a known material capable of planting turf yarns 21 such as a woven fabric, a knitted fabric, and a non-woven fabric can be used.
The artificial lawn 2 uses polyethylene monofilament for the turf yarn 21, but is not limited to this, and the thickness, material, shape, etc. of the yarn may be appropriately selected and used, for example, polyethylene split yarn. May be planted as turf yarn 21, or turf yarn 21 of another material or thickness may be used.

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

  The filler layer 24 uses styrene resin elastomer particles as elastic particles, but is not limited to this. Other synthetic resin elastomers such as olefin resin elastomer, synthetic rubber or natural rubber particles, and disposal Recycled products such as pulverized rubber products may be used alone or in combination.

  The packed bed 24 uses silica sand as hard particles, but is not limited to this, and hard particles such as pebbles and sand other than silica sand, ceramic particles, and resin pellets are used alone or in combination. Also good.

  The coconut filler is a pulverized product of natural coconut, specifically, a mixture of granules, powders and fibers obtained by pulverizing coconut. Even if the size of the particles of the palm filler is large, it is formed in a size of about 5 mm.

  The palm filler retains water supplied by rainwater, watering, etc., and vaporizes when the temperature rises, and suppresses an increase in the surface temperature of the artificial lawn due to the heat of vaporization. By including the coconut filler in the packed bed 24, the temperature at the place where the artificial lawn is laid can be effectively reduced, particularly during summer, when the temperature is likely 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 coconut filler contained in the lower layer 24b and the outside air.
For this reason, it is hard to produce the situation where the water | moisture content which the palm filler of the lower layer 24b exposes to a wind etc. is rapidly vaporized and dried, and the temperature rise inhibitory effect by a palm filler can be maintained for a long time.

The surface layer 24a is formed only of elastic particles.
For this reason, when the filling layer 24 of the artificial lawn 2 receives an external force from above, for example, when a person walks on the artificial lawn 2 or a ball rebounds, the elastic particles are elastically deformed to form the surface. The external force received by the layer 24a can be relaxed, and the transmission of force to the filler below the lower layer 24b can be suppressed.
This makes it difficult for the palm filler contained in the lower layer 24b to move in the packed bed 24 due to external force, so that the palm filler moved from the lower layer 24b is exposed to the surface of the packed bed 24. This makes it difficult to cause problems.
The surface layer 24a is formed only of elastic particles, but is not limited thereto, and may be formed of other fillers such as hard particles or only other fillers. However, in order to suppress the movement of the palm 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 be formed of only elastic particles.

The filler made of elastic particles forming the surface layer 24a is formed so that the solar reflectance thereof is larger than the solar reflectance of the palm filler.
Thereby, even when the filling layer 24 receives 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 palm filling material of the lower layer 24b can be less likely to occur. .
The surface layer 24a is formed only with a filler having a higher solar reflectance than the palm filler, but is not limited thereto, and the surface layer 24a may contain a palm filler, The layer 24a may contain a filler having a solar reflectance smaller than that of the palm filler. However, in order to suppress the drying of the palm filler of the lower layer 24b and to keep the temperature rise suppressing effect for a long time, the surface layer 24a contains 50% by volume or more of a filler having higher solar reflectance than the palm filler. It is preferable to form the surface layer 24a only with a filler having a higher solar reflectance than the palm filler.

Below, Example 1 of the artificial lawn 2 which concerns on this invention is described.
The bottom layer 24c is formed by filling the upper surface of the base fabric 22 in which the turf yarn 21 is planted in a cut pile shape with silica sand as hard particles to a thickness of 10 mm.
The bottom layer 21c is filled with a palm filler to a thickness of 10 mm, and further filled with silica sand 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 artificial lawn 2 of Example 1 was provided by filling the upper surface of the lower layer 24b with elastic particles formed of a styrene resin elastomer in a granular form to a thickness of 12 mm to form a surface layer 24a.

Below, it describes about the comparative example 1 of the artificial lawn 2. FIG.
The bottom layer 24c is formed by filling the upper surface of the base fabric 22 in which the turf yarn 21 is planted in a cut pile shape with silica sand as hard particles to a thickness of 10 mm.
The bottom layer 24c is filled with a palm filler to a thickness of 10 mm, and further filled with silica sand to a thickness of 20 mm, and a brush is pressed from above to mix them to form the lower layer 24b. And the artificial lawn 2 of the comparative example 1 which is not provided with the surface layer 24a was provided.

Below, the measuring method of the solar reflectance of the filler which comprises the filling layer 24 of the artificial lawn 2 is described.
First, the spectral reflectance of the elastic particles forming the palm filler and the surface layer 24a included in the lower layer 24b was measured. The spectral reflectance was measured 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 closely packed 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, and the solar reflectance was calculated for each sample, and the average value was taken as the solar reflectance of each filler.

Based on the above method, when the solar reflectance of the palm filler contained in the lower layer 24b of Example 1 and Comparative Example 1 was measured, the solar reflectance in the near infrared region was 48.8%, and the solar reflectance in the entire wavelength region. A measurement result with a rate of 26.3% was obtained.
Further, when the solar reflectance was measured using a sample of the palm filler wetted with water and kept to the limit, the solar reflectance in the near infrared region was 39.0%, and the solar reflectance in the entire wavelength region. Obtained 21.0%.
And when the solar reflectance of the elastic grain which forms the said surface layer 24a was measured, the solar reflectance in the near-infrared region was 61.4%, and the solar reflectance in all wavelength regions was obtained as a result of 43.8%. . That is, the surface layer 24a of Example 1 is formed of a filler having a solar reflectance greater than that of the palm filler included in the lower layer 24b.

Below, the said Example 1 of the artificial lawn 2 and the temperature measuring method of the comparative example 1 are described.
About each artificial lawn 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 rate of 1 liter / square meter using spraying.
The top surface of the sample was heated by irradiating light from a 500 W halogen lamp obliquely from 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 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 an interval of 10 minutes from the start of light irradiation with the halogen lamp. The measurement of the sample surface temperature was performed by measuring the average value of the surface temperature using an Aposte thermography FSV-7000S placed directly above the sample.

The result of having measured the surface temperature of the artificial lawn 2 of Example 1 and Comparative Example 2 by said method is as showing to the table | surface and graph of FIG.
The surface temperature of Example 1 is higher than that of Comparative Example 1 until 10 minutes have elapsed since the start of heating to irradiate light, and this is due to the palm filler exposed on the surface of the filling layer 24 of Comparative Example 1. This is thought to be due to the temperature rise suppression effect.
On the other hand, after 12 minutes had elapsed since the start of heating, the surface temperature was reversed, and it was confirmed that Example 1 had a lower surface temperature than Comparative Example 1. Further, the state in which the surface temperature of Example 1 is lower than that of Comparative Example 1 is maintained from the elapse of 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 time. It has been confirmed that.

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 coconut filler, elastic particles, or hard particles instead of hard particles.
Further, the lower layer 24b is not provided by mixing the coconut-filled grains and the hard grains, but may be mixed with the coconut-filled grains by selecting or combining other hard grains or elastic grains, and is formed only by the coconut filler. You may let them.
Although another layer that does not include the palm filler may be provided between the surface layer 24a and the lower layer 24b that includes the palm filler in the packed layer 24 of the first embodiment, the temperature rise suppression effect by the palm filler is reduced. In order to obtain efficiently, it is preferable to contain a palm filler in the lower layer 24b in contact with the surface layer 24a.

  In addition, the filling layer 24 of the artificial lawn 2 of the first embodiment is provided in a three-layer structure including the bottom layer 24c, the lower layer 24b, and the surface layer 24a, but is not limited thereto. For example, the bottom layer 24c may be provided in a two-layer structure, or the bottom layer 24c may be provided in a four-layer or more structure in which two or more layers are formed.

DESCRIPTION OF SYMBOLS 1 Base layer 2 Artificial lawn 21 Turf thread 22 Base fabric 23 Backing layer 24 Packing layer

Claims (4)

An artificial lawn in which turf yarn is planted on a base fabric, and a filling layer is provided by filling a filler between the planted turf yarns,
The packed bed includes a lower layer containing a palm filler based on natural palm, and a surface layer disposed on the uppermost side of the packed bed,
The artificial lawn characterized in that the surface layer is mainly formed of a filler having a solar reflectance greater than that of the palm filler.   The artificial lawn according to claim 1, wherein the surface layer is disposed 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 larger solar reflectance than that of the goat 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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