JP2009293244A - Artificial lawn ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial lawn ground which has an impact absorptivity required for competitions such as sports and which does not have a tendency to cause the dispersion of impact absorptivity even if used over a long period. <P>SOLUTION: A granular layer placed between the lawn threads of an artificial lawn comprises three layers: an upper layer of an elastic granular body; an intermediate layer formed by mixing an elastic granular body and a hard granular body; and a lower layer of an elastic granular body. The intermediate layer disposed on the lower side of the upper layer of the elastic granular body layer is formed of a mixture comprising the elastic granular body and the hard granular body, a difference in impact absorptivity between the upper layer and the intermediate layer is reduced, and even if the thickness of the upper layer is varied from place to place, the dispersion of the impact absorbing performance is hard to occur. Since the elastic granular body is formed on the upper and lower sides of the intermediate layer formed of a mixture comprising the elastic granular body and the hard granular body, even if a part of the hard granular body of the intermediate layer is moved in the granular body layer during the use, the layer of only the hard granular layer is not formed since the elastic granular body layer is taken into the elastic granular body layers of the upper layer and the lower layer. Consequently, a large variation of the impact absorptivity is not provided to the artificial lawn ground. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an artificial lawn ground in which sand and other granular materials are filled between turf yarns made of synthetic resin fibers and a method for producing the same.

  Conventionally, a large number of synthetic resin fibers were planted on the base fabric using a tufting machine, and a backing material such as rubber latex was applied to the back of the base fabric to fix the turf yarn. Granulated artificial turf in which a granular layer such as sand is filled between turf yarns provided to provide a granular layer 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 grass with a filler filled with a filler containing elastic granular material and hard granular material between piles planted on a base fabric, the filler is divided into at least three layers or more. Among the three layers close to the turf surface side, the upper layer and the lower layer are both elastic layers mainly composed of elastic granular materials, and the middle layer is a hard layer mainly composed of hard granular materials. An artificial turf with a filler is disclosed.

JP 2003-096712 A

  However, the artificial turf as disclosed in Patent Document 1 can obtain the required shock absorption by the structure of the packed layer, but the thickness of each layer of the filler changes irregularly at each place of the artificial turf when used for a long time. However, there is a problem in that irregularity in ball performance is caused by variations in shock absorption performance. This is because the elastic layer and the hard layer, which have greatly different shock absorption properties, are arranged in the upper layer and the middle layer, respectively. Is one of the factors.

  Therefore, the present invention provides an artificial lawn ground that has shock absorption necessary for performing sports such as sports and is less likely to cause variations in shock absorption even when used for a long time.

In order to achieve the above object, the present invention is configured as follows.
That is, the artificial turf ground according to the present invention has turf yarn planted on a base fabric, a backing material is applied to the back of the base fabric to fix the turf yarn, and the granular material is placed between the planted turf yarns. An artificial lawn filled with a granular material layer and laid on a base layer, wherein the granular material layer is an upper layer consisting only of elastic granular materials, and under the upper layer It is characterized by comprising three layers of an intermediate layer made of a mixture of the arranged elastic granular material and hard granular material, and a lower layer made only of the elastic granular material arranged under the intermediate layer. .

  According to the artificial lawn ground according to the present invention, the elastic granular material is arranged in all layers of the upper layer, the middle layer, and the lower layer provided in the granular material layer. Obtainable. In addition, since it is composed of a mixture of elastic granules and hard granules in the middle layer, it is too elastic like a granular layer composed of only elastic granules, and the ball is too bounced when performing ball games etc. Does not cause any problems. In addition, since the uppermost layer is composed of only elastic granules on the middle layer composed of a mixture of elastic granules and hard granules, the hard granules are placed on the surface of the artificial lawn ground. It does not appear, and the hard granule does not cause a player to be damaged. For this reason, it is not necessary to take measures such as forming the shape of the hard granular body into a sphere. In addition, since the middle layer arranged under the upper layer, which is an elastic granular material layer, is composed of a mixture of elastic granular material and hard granular material, the difference in shock absorption between the upper layer and the middle layer is reduced, and the thickness of the upper layer depends on the location. Even if it fluctuates, the impact absorption performance is less likely to vary. Also, since the elastic granular material layer is formed above and below the intermediate layer composed of a mixture of elastic granular material and hard granular material, respectively, part of the hard granular material in the middle layer is granular in the course of using artificial grass ground for a long time. Even if it moves in the layer, it is taken into the upper and lower elastic granular material layers, so that it does not form a layer of only hard granular material, and the impact absorption of the artificial lawn ground is greatly changed. Can be suppressed.

  In addition, if the true specific gravity of the hard granular material blended in the middle layer is larger than the true specific gravity of the elastic granular material blended in the middle layer and the elastic granular material in the lower layer, the artificial lawn ground is used for a long time. When a part of the hard granular material in the middle layer moves in the granular material layer, the hard granular material moves down the middle layer and is taken into the lower layer, so that the hard granular material is near the upper part of the middle layer. Concentration does not increase the difference in shock absorption between the upper layer and the middle layer, and the variation in the shock absorption performance of the artificial lawn ground can be further reduced.

  According to the artificial lawn ground according to the present invention, it has sufficient shock absorption for various sports competitions, and even when used for a long time, variation in shock absorption hardly occurs.

  Embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an artificial lawn ground according to the present invention. The artificial lawn ground of the present embodiment is formed by spreading the granular material layer 1 with a spreader after the artificial lawn is laid on the base layer 4. In the artificial lawn, a polyethylene turf yarn 3 is planted on a base fabric 2 using a plain woven fabric made of polypropylene to form turf leaves, and a backing material 5 such as rubber latex is formed from the back surface of the base fabric 2. Is applied to fix the turf yarn 3.

  The granular material layer 1 has a three-layer structure of an upper layer 11 disposed on the surface of the artificial lawn ground, an intermediate layer 12 below the upper layer 11, and a lower layer 13 below the intermediate layer 12. The upper layer 11 and the lower layer 13 are composed of elastic granules in which SBR grains are mainly mixed with EPDM or natural rubber grains. Further, the middle layer 12 is constituted by blending silica sand with the elastic granule, and 100 parts by weight of silica sand is blended with 100 parts by weight of the elastic granule.

  The particle size of the elastic granular material used for the upper layer, the middle layer, and the lower layer is such that 90% or more passes through a 4.0 mm sieve, and 10% or less passes through a 0.5 mm sieve. It is adjusted to. In addition, the particle size of the silica sand to be mixed in the middle layer is adjusted so that 90% or more of the sieve with an opening of 1.68 mm passes and the particle passing through the sieve of an opening of 0.21 mm becomes 10% or less. Yes.

  The method for forming the granular material layer 1 having a three-layer structure will be described. First, the elastic granular material is sprayed from the upper surface of the artificial lawn laid on the base layer 4. Silica sand is sprinkled from above, elastic particles are further sprinkled from above, brushing with a brush body to stir the silica sand and elastic particles in the granular layer, An intermediate layer 12 composed of a mixture of the above elastic granules and silica sand is formed. When brushing, the tip of the brush body reaches the lower part of the silica sand layer, does not reach the lower part of the elastic granular body layer below, and is positioned so as to form a gap with the base fabric 2 The lower layer 13 made only of an elastic granular material not mixed with silica sand can be formed on the base fabric 2. Further, the application and brushing of the silica sand and the elastic particles for the middle layer 12 may be performed only once, but may be performed in a plurality of times. . After forming the middle layer 12, the upper part 11 comprised only with an elastic granular material is formed by spraying an elastic granular material from the top, and brushing so that only the surface may be leveled from there. In addition, the brush body used for brushing can preferably be a rotating brush in order to perform work efficiently, but is not limited to this, and brushing is performed so as to reciprocate horizontally using a deck brush or the like. Also good.

  The method for forming the granular material layer 1 on the artificial lawn will be described in more detail. The lawn yarn 3 is planted in the upward direction of the base fabric 2 and is adjusted to a length of about 65 mm in a cut pile shape. From this, an elastic granular material is sprayed to form an elastic granular material layer having a thickness of about 10 mm. Sprinkle an amount of silica sand to form a layer having a thickness of about 2.5 mm from above, and further spray an elastic granule to an amount to form a layer having a thickness of about 2.5 mm from above. Is brushed with a brush body whose height is adjusted so as to leave a gap of about 10 mm from the upper surface of the base fabric 2. By adjusting the position of the tip of the brush body as described above, the layer of silica sand is agitated with the elastic granules above and below to form a layer of a mixture of elastic granules and silica sand and elastic below this layer. A lower layer 13 made only of granular materials is formed. Further, in this embodiment, after the dispersion of the elastic particles, the brushing is performed after each of the silica sand and the elastic particles is sprayed. However, the brushing is performed after the first dispersion of the elastic particles, and each of the silica sand and the elastic particles is sprayed. You may brush again later. Thereafter, silica sand in an amount to form a layer having a thickness of about 2.5 mm is sprayed from above, and further an elastic granule in an amount to form a layer having a thickness of about 2.5 mm is further sprayed from above. The tip is brushed with a brush body whose height is adjusted so that a moderate gap of 10 mm or more from the upper surface of the base fabric 2 is opened. The middle layer 12 is formed to a thickness of about 20 mm. Thereafter, the elastic granular material in an amount sufficient to form a layer having a thickness of about 5.0 mm is sprayed from above, and the elasticity of the upper portion is adjusted with a brush body whose height is adjusted so as not to reach the surface of the middle layer 12. Brushing so that the surface of the granular material is leveled. Further, the above-mentioned elastic granular material in an amount to form a layer having a thickness of about 5.0 mm is sprayed from above, and the operation of brushing so as to level the surface of the elastic granular material is repeated once. An upper layer 11 having only an elastic granular material is formed to a thickness of about 10 mm. By the above operation, the lower layer 13 having a thickness of 10 mm, the middle layer 12 having a thickness of 20 mm, and the granular layer 1 having a three-layer structure having an upper layer 11 having a thickness of 10 mm are provided and protrudes from the surface of the granular layer 1 by about 25 mm. An artificial turf ground with the turf yarn 3 can be formed. The formation of the middle layer 12 and the upper layer 11 may be performed by one spraying and brushing, but by performing the process in a plurality of times as described above, mixing of the silica sand into the upper layer 11 and the lower layer 13 is more reliably prevented. In addition, the thicknesses of the upper layer 11, the middle layer 12, and the lower layer 13 can be accurately formed as designed values.

  The foundation layer 1 can be suitably formed by placing water-permeable asphalt concrete on the ground, but is not limited to this, and may be the ground itself, and non-permeable asphalt concrete is cast on the ground. It may be formed by installing. Further, in this embodiment, a plain woven fabric made of polypropylene is used for the base fabric 2, but the present invention is not limited to this, and any material may be used as long as turf leaves are planted, 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 the present embodiment, a mixture in which EPDM or natural rubber particles are mixed into the SBR particles is used as the elastic granular material used for the granular material layer 1, but the present invention is not limited to this, and a granular material having elasticity. Any body is acceptable. For example, synthetic rubber such as SBR and EPDM and natural rubber particles may be used alone without mixing, or recycled products such as pulverized waste tires, elastomers, and the like may be selected or combined. Moreover, in this embodiment, although the same elastic granular material is used for the upper layer 11, the middle layer 12, and the lower layer 13, you may use a different elastic granular material for each layer.

  Moreover, in this embodiment, although silica sand is used as the hard granular material utilized for the granular material layer 1, it is not restricted to this, What is necessary is just a hard granular material. For example, pebbles, ceramic grains, resin pellets, or the like may be selected or combined.

  In the present embodiment, as the elastic granules constituting the upper layer 11 and the lower layer 13, an elastic granule in which EPDM or natural rubber particles are mixed into the SBR grains is used, and the true specific gravity thereof is added. Although it varies depending on the agent, it is generally about 0.9 to 1.2. On the other hand, since the true specific gravity of silica sand is 2 or more, by using silica sand as the hard granular material mixed in the middle layer 12, hard granular material having a true specific gravity larger than that of the elastic granular material can be mixed. Since the true specific gravity of the silica sand is larger than that of the elastic granular material, when the silica sand mixed in the middle layer 12 moves using the artificial turf ground of this embodiment for a long time, it moves downward rather than upward. For this reason, the moved silica sand is not exposed to the surface of the upper layer 11 and does not damage the player on the artificial lawn ground. Further, since the moved silica sand is taken into the lower layer 13, only a layer of silica sand is not formed, and even when the thickness of the upper layer 11 on the upper part thereof is changed, the impact absorption on the artificial turf ground surface is not greatly changed.

It is sectional drawing which shows one Embodiment of the artificial grass-made ground based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Granular body layer 11 Upper layer 12 Middle layer 13 Lower layer 2 Base cloth 3 Lawn yarn 4 Base layer 5 Backing material

Claims (2)

  Artificial turf yarn is planted on a base fabric, a backing material is applied to the back surface of the base fabric to fix the turf yarn, and a granular material layer is provided by filling the turf yarn between the planted turf yarns. A ground in which lawn is laid on a base layer, wherein the granular layer is an uppermost layer composed only of elastic granular material, and an elastic granular material and a hard granular material arranged under the upper layer. An artificial lawn ground comprising: an intermediate layer composed of a mixture of the above and a lower layer composed of only elastic granules disposed below the intermediate layer.   The artificial lawn ground according to claim 1, wherein the true specific gravity of the hard granular material blended in the middle layer is larger than the true specific gravity of the elastic granular material blended in the middle layer and the lower elastic granule.

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