JP2010196433A - Artificial lawn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial lawn the color of which is not bright when viewed and the surface temperature rise of which is effectively suppressed. <P>SOLUTION: In this artificial lawn having a granular layer formed by filling elastic granular bodies between the lawn threads embedded in a foundation cloth 2, the elastic granular body is formed in such a manner that the averaged spectral reflection factor in the wavelength area of 800-2,100 nm is larger than that in the wavelength area of 350-750 nm. By forming the elastic granular body in this manner, the brightness of the color of the elastic granular body to be viewed can be suppressed, and the temperature rise can be suppressed by reflecting invisible infrared ray. When the elastic granular bodied are formed in such a manner that the averaged spectral reflection factor in the wavelength area of 350-750 nm is 35% or less and the averaged spectral reflection factor in the wavelength area of 800-2,100 nm is 45% or above, discomfort such as glare is not provided to a person who views the artificial lawn the brightness of color of which is suppressed when viewed and which is filled, the rise of the surface temperature of the artificial lawn is suppressed, and discomfort is not provided to a person located thereon. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an artificial lawn in which granules are filled between turf yarns made of synthetic resin fibers.

  Conventionally, a number of synthetic resin fibers are planted on the base fabric using a tufting machine, and granular layers such as sand are filled between the planted turf threads to form a granular layer. Artificial grass with a body is widely used as a surface material for various sports stadiums. Various inventions have been disclosed for the purpose of, for example, imparting shock absorption to the artificial turf with respect to the structure of the granular material filled in the artificial turf.

For example, in Patent Document 1, in an artificial turf structure filled with a filler containing elastic granular material between piles of artificial turf,
In addition to shock absorption, direct sunlight can be obtained by including the above-mentioned elastic granular material with a specific colored elastic granular material having a spectral reflectance of 40% or more in a wavelength range of 550 to 750 nm in spectral reflectance measurement according to JIS-A5759. An artificial turf structure that attempts to suppress an increase in the surface temperature of the artificial turf due to the above is disclosed.

JP 2006-37681 A

  However, since the specific colored elastic granular material used in the artificial turf structure disclosed in Patent Document 1 has increased spectral reflectance in the wavelength region of 550 to 750 nm, which is the wavelength region of visible light, the color tone that is visually recognized. There is a concern that the problem will be that it will brighten and make the filled artificial lawn dazzling.

  Therefore, the present invention provides an artificial lawn that is visually dull and has a high temperature rise suppression effect.

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 granular material layer is provided by filling an elastic granule between the planted turf yarns,
The elastic granular material is characterized in that an average spectral reflectance in a wavelength range of 800 to 2100 nm is larger than an average spectral reflectance in a wavelength range of 350 to 750 nm.

  According to the artificial lawn according to the present invention, the average spectral reflectance of the elastic granular material in the wavelength range of 350 to 750 nm that is the wavelength region of visible light is more than the average spectral reflectance of the wavelength range of 800 to 2100 nm that is the wavelength region of infrared rays. Since it is small, while suppressing the brightness of the color tone of the elastic granular material visually recognized, the infrared rays which are not visually recognized can be reflected and the temperature rise can be suppressed.

  Further, if the elastic granular material is formed so that the average spectral reflectance in the wavelength range of 350 to 750 nm is 35% or less and the average spectral reflectance in the wavelength range of 800 to 2100 nm is 45% or more, it is visually recognized. Brightness of color tone is suppressed and people who see the filled artificial lawn do not feel discomfort such as glare and the surface temperature of the artificial lawn is prevented from rising, and people on it do not feel uncomfortable .

  In addition, if the peak value that shifts from the increase in the spectral reflectance of the elastic granule to the decrease is formed in the wavelength range of 490 to 575 nm, the elastic granule can be visually recognized in the hue of the hue near green. When the elastic granular material is filled between the yarns, the gap between the turf yarns becomes inconspicuous in harmony with the green color of the turf yarn imitating the turf leaves, and the aesthetic appearance of the artificial grass is improved.

  In addition, if the turf yarn is formed to have a width of 0.3 mm or more and 3 mm or less and a length of 10 mm or more and 35 mm or less protrudes from the upper surface of the granular material layer, the temperature rise in the turf yarn Can suppress the temperature of the artificial lawn surface effectively.

  According to the artificial lawn of the present invention, the visible color tone is not dazzling, and the temperature rise of the surface is effectively suppressed.

It is sectional drawing which shows one Embodiment of the artificial lawn which concerns on this invention. It is the table | surface which showed the result of having measured the spectral reflectance of each elastic granule which mix | blended compounding agents, such as a pigment, with the base material. 2 is a graph of spectral reflectance measured for Example 1 in a wavelength range of 350 to 2100 nm.

Embodiments of the present invention will be specifically described with reference to the drawings.
The artificial lawn of this embodiment forms a grass leaf by planting polyethylene turf yarn 3 in a cut pile shape on a base fabric 2 using a plain woven fabric made of polypropylene, and urethane from the back surface of the base fabric 2. A backing material 5 such as resin is applied to fix the turf yarn 3. After this is laid on the foundation layer 4, the granular material is sprayed from above by a spreader and filled between the planted grass yarns 3 to form the granular material layer 1.

  The granular material layer 1 has a two-layer structure of an upper layer 11 disposed on the surface of the artificial lawn and a lower layer 12 below the upper layer 11. The upper layer 11 is composed of an upper elastic granule made of thermoplastic elastomer particles. The lower layer 12 is formed by blending dredged sand with a lower layer elastic granule made of SBR particles, and 100 parts by weight of the lower layer elastic granule is blended with 100 parts by weight of silica sand.

  When the formation method of the granular material layer 1 of a two-layer structure is demonstrated, the said lower layer elastic granular material will be sprayed first from the upper direction of the base fabric 2 laid in the base layer 4. FIG. By dispersing silica sand from above and brushing with a brush body, the lower elastic particles and the silica sand in the granular material layer are agitated to form a lower layer 12 composed of a mixture of the lower elastic particles and silica sand. Scattering and brushing of the lower layer elastic granular material and silica sand for forming the lower layer 12 may be performed only once, but may be performed multiple times. After forming the lower layer 12, the upper layer elastic particles are sprayed from above, and brushing is performed so as to level the surface only, thereby forming the upper layer 11 composed only of the upper layer elastic particles. In addition, the brush body used for brushing can preferably be a rotating brush for efficient work, but is not limited to this, and the brush body is brushed so as to reciprocate horizontally using a vibrating brush or deck brush. May be performed.

  The particle size of the lower elastic granular material used for the lower layer 12 is adjusted so that it passes 90% or more through a 4.0 mm sieve and 10% or less passes through a 0.5 mm sieve. is doing. In addition, the particle size of the silica sand to be blended in the lower layer 12 is adjusted so that 90% or more of the sieve with an opening of 1.68 mm passes and 10% or less of the particles pass through the sieve with an opening of 0.21 mm. ing.

  The foundation layer 4 can be suitably formed by placing water-permeable asphalt concrete on the ground, but is not limited thereto, and may be the ground itself, and non-permeable asphalt concrete is cast on the ground. It may be formed by installing. In the present embodiment, a plain woven fabric made of polypropylene is used for the base fabric 2. However, the present invention is not limited to this, and any material may be used as long as it is planted with turf leaves such as a woven fabric, a knitted fabric, and a non-woven fabric. In this embodiment, polyethylene is used for the turf yarn 3, but synthetic resins such as polypropylene, polyester, and polyamide can also be suitably used.

  Further, in this embodiment, SBR particles are used as the lower elastic granules used for the lower layer 12, but the present invention is not limited to this, and synthetic rubber such as SBR and EPDM, or natural rubber particles are used alone or in combination. It may be used, and recycled products such as pulverized waste tires or elastomers may be selected or combined. Further, in the present embodiment, the lower elastic granules and the cinnabar are blended to form the lower layer 12, but the present invention is not limited to this, and the lower elastic granules and the cinnabar may each be used alone, Granules such as elastic granules and pebbles other than cinnabar, ceramic grains, and resin pellets may be selected or combined.

  The upper elastic granule constituting the upper layer 11 is formed by extruding a thermoplastic styrene resin elastomer. Specifically, it is extruded into a cylindrical shape having a diameter of about 2 mm by an extrusion molding machine, and is formed into a cylindrical shape cut to a length of about 2 to 5 mm.

  The composition of the upper elastic granular material is 60% by weight of a styrene resin elastomer as a base material, 0.6% by weight of a toning pigment, and calcium carbonate, an ultraviolet absorber, etc. as other ingredients. 39.4% by weight.

Further, if the average spectral reflectance in the wavelength range of 350 to 750 nm of the upper elastic granular material is preferably set to 35% or less, more preferably 30% or less, the brightness of the color tone to be visually recognized is suppressed and filled. The person who visually recognizes the artificial lawn does not feel discomfort such as glare.
Further, the average spectral reflectance in the wavelength range of 800 to 2100 nm of the upper elastic granular material is preferably 45% or more, more preferably 55% or more, so that the surface temperature of the artificial lawn is effectively increased. It is suppressed.

FIG. 2 is a table showing the result of calculating the average spectral reflectance for the upper elastic granular material prepared by changing the color tone and adjusting the color tone.
As a method of calculating the average spectral reflectance, first, a sheet-like sample is prepared from a raw material having the same composition as the elastic granular material.
Next, the spectral reflectance in the wavelength range of 350 to 2100 nm is measured at intervals of 50 nm using an ultraviolet / visible / near infrared spectrophotometer UV-3150 manufactured by Shimadzu Corporation.
The average spectral reflectance is calculated by simply averaging the measured values. The average spectral reflectance in the visible light and infrared wavelength regions is the average of the wavelength region of 350 to 750 nm and the wavelength region of 800 to 2100 nm. Spectral reflectance is calculated respectively.

  The surface temperature was measured by placing each of the prepared elastic granular samples in a 10 × 10 × 3 cm wooden container and exposing it outdoors with the upper surface facing up on a clear day. The surface temperature at this time was measured between 11 o'clock and 13:30 at 30 minute intervals by Thermography FSV-7000S manufactured by Apiste Co., Ltd., and the average value of each measurement value was calculated.

Examples and comparative examples are described below.
In Example 1, phthalocyanine blue, titanium yellow, and titanium oxide were blended as pigments for toning, and the upper elastic granules were formed in a green tone.

  In Example 2, a petal was blended as a toning pigment, and the upper elastic granule was formed in a reddish brown color tone.

  In Examples 3 and 4, a petal, yellow iron oxide, titanium yellow, and titanium oxide were blended as the toning pigments, and the upper elastic granular material was formed in a brown color tone.

  In Comparative Example 1, yellow iron oxide was blended as a toning pigment, and the upper elastic granule was formed in a brown tone.

  In Comparative Example 2, zinc ferrite and titanium oxide were blended as pigments for toning, and the upper elastic granules were formed in a beige tone.

  As shown in FIG. 2, in Examples 1 to 4, the average value of the measured surface temperature did not rise above about 50 ° C. compared to the value of 55.2 ° C. in Comparative Example 1, The temperature is suppressed. Among them, the surface temperatures of Examples 1, 3, and 4 in which the average spectral reflectance in the wavelength range of 800 to 2100 was 55% or more were low, and Example 1 was the most effective in suppressing temperature increase.

  Moreover, although Examples 1-4 are toned so that it may be visually recognized by green, reddish brown, and brown, respectively, when each Example during outdoor exposure was observed visually, all felt dazzling. In Examples 1, 2, and 3 in which the average spectral reflectance in the wavelength region of 350 to 750 nm is 30% or less, the brightness was visually recognized as being suppressed. On the contrary, in Comparative Example 2 in which the average spectral reflectance showed a large value, the surface temperature was suppressed, but when visually observed, it was more dazzling than Examples 1-4. I felt it. In this way, the smaller the average spectral reflectance in the visible light wavelength region of 350 to 750 nm, the less the color tone feels dazzling, but at the same time, when providing white or yellow lines on an artificial lawn, the line portion The contrast with other parts increases, and when using an artificial lawn for a stadium or the like, the effect of making the line part more visible can also be expected.

FIG. 3 is a graph of spectral reflectance in the wavelength range of 350 to 2100 measured for Example 1.
The sample of Example 1 is formed so as to be visually recognized in green, and a peak value that shifts from an increase to a decrease in the spectral reflectance in the wavelength region of visible light is seen in the vicinity of 550 nm. Generally, a sample that is visually recognized as yellow-green has a peak value of around 490 nm. Therefore, in this measurement method, a peak value is observed at around 500 nm, and a sample that is visible in blue-green is around the peak value of 575 nm. Therefore, in the measurement method of the present case, a peak value is seen at around 550 nm or 600 nm.

The above-mentioned examples and comparative examples were comparisons of samples in which the composition of the upper elastic granular material was formed in a sheet shape without laying the artificial turf. Next, in the state in which the artificial turf was laid The test method observed for the color tone of the granular material layer and the results will be described below.
Artificial lawn made by planting lawn yarn 3 with a width of 1.6 mm on base fabric 2 in a cut pile shape with a length of about 40 mm is cut to a size of 10 × 10 cm and placed in a wooden container of 10 × 10 × 3 cm. Two pieces of the lower layer 12 of the granular material layer 1 provided with a thickness of 20 mm are prepared. An upper layer 11 in which Example 1 and Example 3 were respectively made into upper elastic granules was filled to a thickness of 10 mm, and a sample was formed so that turf yarn protruded from the upper surface of the upper layer 11 by about 10 mm. When these were observed visually, the artificial lawn filled with Example 3 had a large color contrast between the turf yarn and the elastic granule because the beige elastic granule was visually recognized between the green turf yarns. It was felt, and the gap between each turf yarn was felt large, and impressed with the thin turf. On the contrary, in the artificial lawn filled with Example 1, since the green elastic granular material is visually recognized between the green turf yarns, the gap between the turf yarns is not felt large, and the turf is thicker. Impressed the grass.

In addition, synthetic resins such as polyethylene, polypropylene, polyester, and polyamide that are suitable as materials for the turf yarn 3 generally have higher heat storage properties than the upper elastic granule of the present invention. For this reason, in the temperature rise suppression of the artificial lawn, the thinner the cross-sectional shape of the turf yarn 3, the less likely it is to store heat. If the width of the turf yarn 3 is 3 mm or less, the temperature rise is suitably suppressed. In addition, the width of the turf yarn 3 is preferably as narrow as possible for temperature rise suppression, but is preferably 0.3 mm or more from the viewpoint of durability.
Moreover, if the length which the turf yarn 3 protrudes from the upper surface of the said granular material layer shall be 35 mm or less, the heat storage of the turf yarn 3 can be similarly suppressed and the surface temperature rise of the artificial turf can be suppressed. As the protruding length of the turf yarn 3 is smaller, the temperature rise is suppressed. However, if the turf yarn 3 is too small, the aesthetic appearance as an artificial turf is impaired.
Moreover, if the number of planted turf yarns 3 is set to 1,000,000 pieces / square meter or less, heat storage of the turf yarns 3 can be similarly suppressed, and an increase in the surface temperature of the artificial turf can be suppressed. As the number of turf yarns 3 planted is smaller, the temperature rise is suppressed, but if it is too small, the beauty of artificial turf is impaired, so it is preferable to plant 40,000 lines / square meter or more.

DESCRIPTION OF SYMBOLS 1 Granular body layer 11 Upper layer 12 Lower layer 2 Base fabric 3 Turf thread 4 Base layer

Claims (4)

An artificial lawn in which turf yarn is planted on a base fabric, and an elastic granule is filled between the planted turf yarn to provide a granular layer,
An artificial lawn characterized in that the elastic granular material has an average spectral reflectance in a wavelength range of 800 to 2100 nm larger than an average spectral reflectance in a wavelength range of 350 to 750 nm.   The spectral reflectance of the elastic granular material is characterized in that an average spectral reflectance in a wavelength range of 350 to 750 nm is 35% or less and an average spectral reflectance in a wavelength range of 800 to 2100 nm is 45% or more. Item 2. The artificial lawn according to Item 1.   The artificial lawn according to any one of claims 1 to 2, wherein a peak value that shifts from an increase in spectral reflectance of the elastic granular material to a decrease is formed in a wavelength range of 490 to 575 nm. The turf yarn is formed to have a width of 0.3 mm or more and 3 mm or less, and is provided so that a length of 10 mm or more and 35 mm or less protrudes from an upper surface of the granular material layer. Item 4. The artificial lawn according to any one of Items 1 to 3.

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