JP2003034906A - Artificial lawn structural body and artificial lawn stadium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial lawn structural body in which comfortable playability can be obtained throughout the year by effectively suppressing the rise of the temperature of the artificial lawn even in low cost. SOLUTION: Plural kinds of granular materials which are different in color and/or specific gravity are included as a filler in which the filler containing an elastic filler among the piles of the artificial lawn is filled, at least two or more layers are formed by the granular materials, and a specific filler, of which the true specific gravity is smaller than the lower part side filler and a heat absorption ratio is low, is much contained on the uppermost layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf structure in which a pile of artificial turf is filled with a filler, and more specifically, the surface of the artificial turf is protected from high temperatures due to direct sunlight or the like. The present invention relates to an artificial turf structure capable of effectively preventing and maintaining comfortable playability.

[0002]

2. Description of the Related Art As artificial turf used in sports and athletic facilities such as soccer and baseball, a type has been developed in which a filler made of elastic particles is filled between the piles.
Generally, as this type of filler, a crushed product of a waste rubber product such as a waste tire that is inexpensive and available in large quantities is used.

The true specific gravity of this elastic granular material is close to 1.0, so that it tends to scatter due to a player's protrusion or the like. Therefore, the pile length (turf length) of the artificial grass is larger than that of the filling material. Project 10 to 30 mm or more from the surface,
Prevents the filler from scattering.

[0004]

However, since the filler made of pulverized waste rubber products such as the above-mentioned waste tires is generally colored black, it is easy to absorb heat due to light. Therefore, in summer, the surface temperature of the artificial turf rises by absorbing the heat of the shining sunlight, which imposes a heavy physical burden on the player and tends to impair comfort.

Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-260410, an artificial turf in which a water flow groove is arranged in the lower layer of the artificial turf to control and manage the amount of water in the lower layer of the artificial turf is also disclosed. However, this not only requires large-scale equipment construction, but also makes it difficult to keep the surface of the artificial grass uniform.

[0006] On the other hand, there is also one in which a water absorbing material such as a water absorbing polymer is included in a part of the filler so as to enhance the water retention of the artificial grass, but this kind of water absorbing material is always easy and inexpensive. You don't always get the amount you need.

The present invention has been made in order to solve the above-mentioned problems, and its object is to provide a comfortable playability all year round by effectively suppressing the temperature rise of the artificial turf at a low cost. It is to provide an artificial turf structure capable of obtaining

[0008]

In order to achieve the above-mentioned object, the present invention provides an artificial grass structure in which a filler containing an elastic filler is filled between the piles of the artificial grass. And / or at least two or more layers are formed by including a plurality of types of granular materials having different specific gravities, and the uppermost layer thereof has a lower true specific gravity than the lower filler and a low heat absorption rate. It is characterized by containing a large amount of a specific filler.

According to this, by including a large amount of the filler having a low heat absorption coefficient in the filler of the uppermost layer which is directly affected by the direct sunlight, the temperature rise of the artificial turf can be effectively suppressed and the lower part By making the true specific gravity smaller than the side,
It is possible to suppress the filling material from sneaking into the lower side, and without requiring troublesome maintenance, a stable artificial grass can be obtained throughout the year.

The specific filler contained in the uppermost layer is preferably colored in a color having elasticity and a low heat absorption coefficient. According to this, the temperature of the filler can be effectively suppressed by providing the filler with a color such as white that does not easily absorb heat, in other words, a color that easily reflects light. The term "coloring" in the present invention means that the filler is coated with a pigment or is artificially colored by kneading, or a unique color that the filler has in a natural state such as rice husks and wood chips. Including etc.

In a more preferred embodiment, the specific filler contained in the uppermost layer has a true specific gravity of 0.3 to 1.0, and the uppermost layer has a layer thickness of 5 to 20 mm. Is preferred. According to this, when the true specific gravity exceeds 1.0, the filler easily sinks into the lower layer and the heat absorption suppressing effect decreases, and when the true specific gravity is less than 0.3, the scattering is severe and the lower layer is likely to be exposed on the surface. In either case, it is difficult to obtain the heat absorption suppressing effect.

Further, when the layer thickness exceeds 20 mm, the overall specific gravity becomes small, the filler easily moves due to kicking, and the flatness is easily impaired. On the other hand, when the layer thickness is less than 5 mm, the covering property with respect to the lower layer is deteriorated, the lower layer is exposed by the use over time, and the heat absorption suppressing effect is reduced.

The lower filler includes elastic particles made of waste rubber products such as waste tires, and the specific filler contained in the uppermost layer has rubber chips colored in a color other than black. Is used. According to this, it is possible to use inexpensive and recycled products that can be obtained in large quantities.

In addition to this, wood particles such as rice husks, sawdust, crushed wood chips, and crushed cork may be used as the filler to be filled in the uppermost layer. It has good water absorption, can effectively suppress temperature rise, and by using natural materials, it is safe to enter the player's mouth.

The present invention also includes an artificial grass stadium constructed by the above-mentioned artificial grass structure. That is, the present invention is applicable to various artificial turf competition facilities such as tennis courts, soccer fields, baseball fields, and athletic fields.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an artificial turf structure 1 of the present invention comprises a base cloth 2 and piles 3 at predetermined intervals.
The artificial turf 1 with tufts and the back surface of which the pile 3 is prevented from coming off is laid on the base, and the pile 3
It is constructed by filling the filling material 4 in between.

In this embodiment, the base fabric 2 is, for example, polypropylene (PP), polyethylene (PE), nylon (NY), polyethylene terephthalate (PET).
It is also possible to use a resin-made base fabric raw yarn woven uniaxially stretched or woven together to form short fibers into short fibers, and use them one or two layers,
It is more preferable to stack two sheets because the stability in steps is higher and wrinkles are less likely to be generated by external force after laying.

When two base cloths 2 are laminated, the base cloth on the lower side of the base cloth 2 is made of cotton-like synthetic fibers punched, so that dimensional stability and wrinkle prevention can be obtained. Get better

The pile 3 is made of polypropylene (P
P), polyethylene (PE), nylon (NY), polyethylene terephthalate (PET) or other synthetic resin split yarn or monofilament yarn may be used, and the thickness thereof is preferably 5000 to 10000 d.
tex. The thickness when using the monofilament yarn is the total thickness obtained by combining a plurality of single yarns.

In this embodiment, the pile 3 is made of polypropylene split yarn. Further, as a process for preventing the pile 3 from coming off, a method of applying SBR latex rubber, urethane resin or the like to the back surface of the base fabric 2 is used.

The artificial turf 1 of the present invention is a so-called long pile artificial turf in which the pile length H from the base cloth 2 to the pile tip is 30 to 60 mm, and the filler 4 is placed between the piles 3.
Is the pile protrusion height h from the surface of the filler 4 to the pile tip
2 is filled so as to be 10 mm or more. According to this, scattering of the filler 4 is effectively prevented.

The filling material 4 has a two-layer structure in which the lower layer 41 and the upper layer 42 are filled to have a predetermined thickness. In this embodiment, the upper layer 42 is a substantially uppermost layer, and the thickness of each filler layer is appropriately selected according to the specifications as long as the pile protrusion height h2 described above protrudes by 10 mm or more. Good.

In this embodiment, the lower layer 41 comprises a mixture of elastic particles 411 and hard particles 412,
It is filled with a predetermined thickness so that the elasticity required by the artificial grass can be obtained. The mixing ratio of the elastic granular material 411 and the hard granular material 412 is arbitrarily selected according to the specifications.

As the elastic granular material 411, a recycled product such as a waste rubber product is preferably used, but among the recycled products of the waste rubber product, more preferred is a waste rubber product such as a window frame because it has less odor. Is. Hard granules 412
Can be various ceramics or stones, and is not particularly limited, but silica sand is more preferable.

The elastic particles 411 have a particle size of 0.3-3.
It is preferable that 80% or more of 0 mm is contained. That is, if the particle size exceeds 3.0 mm, the artificial turf is poorly fitted between the piles, and if the particle size is less than 0.3 mm, the particles may be scattered or flown out due to wind or rainfall.

The hard particles 412 have a particle size of 0.1 to 1.
It is preferable that 80% or more is 2 mm. That is, the particle size is less than 0.1 mm or 1.2 m
When it exceeds m, it becomes easy to separate from the elastic granular material 411,
The separated hard granular material 412 moves to the lower part of the artificial grass,
The elasticity of artificial grass decreases.

In this embodiment, the lower layer 41 is composed of a mixed layer of elastic particles 411 and hard particles 412. However, in addition to this, it is composed of elastic particles 411 and hard particles 412 as a single substance. It may be a plurality of laminated layers. In this case, the layer thickness and the number of layers of each layer are appropriately selected according to the specifications of the artificial turf.

Next, the uppermost layer (upper layer) 42 will be described. The basic configuration of the filler 421 filled in the uppermost layer 42 is such that the true specific gravity is smaller than that of the lower layer 41, and
Any elastic granular material having a low heat absorption rate may be used. As a more specific aspect, it is preferable that the true specific gravity is 0.3 to 1.0 and the layer thickness h1 is 5 to 20 mm.

That is, if the true specific gravity exceeds 1.0, the filler 421 sunk into the lower layer side, and the heat absorption suppressing effect decreases. On the other hand, if it is less than 0.3, the scattering is severe
The lower layer is easily exposed on the surface, and as a result, the heat absorption suppressing effect cannot be expected.

Further, if the layer thickness h1 is less than 5 mm, the covering property with respect to the lower layer 41 is deteriorated, the lower layer is exposed by the use over time, and the heat absorption suppressing effect is lowered. On the other hand, when the layer thickness h1 exceeds 20 mm, the overall specific gravity decreases, the filler 421 easily moves due to kicking, etc., and flatness is likely to be impaired.

The specific material of the filling material 421 is not particularly limited as long as it satisfies the above conditions, but the following examples 1 to 3 are exemplified. [Example 1] As a method for coloring a pulverized product of colored foamed rubber, a method of directly kneading a colorant into a raw material for coloring, or a method of coloring the surface of a black rubber such as a waste rubber product when used However, the former case is more preferable than the latter case because there is no risk of peeling and discoloration and the effect can be maintained. [Example 2] The same method as in Example 1 above can be used for coloring a crushed product of a synthetic resin foam such as urethane or polyethylene. By foaming so as to form open cells, the effect of suppressing the temperature rise due to the foam layer absorbing water is also exhibited. [Example 3] Natural materials such as wood chips, crushed cork, sawdust, and rice husks have a water-absorbing effect due to their natural porous structure, and have an effect of suppressing temperature rise due to their water retention effect. As it is a natural material, it is inconspicuous even if it scatters, and it is harmless if it gets into the player's mouth.

Other than Examples 1 to 3 described above, any elastic granular material having a lower true specific gravity and a lower heat absorption coefficient than the lower layer 41 can be arbitrarily selected and used. Also,
In this embodiment, the uppermost layer 42 is composed of a single substance of elastic granular material, but it may be a mixture obtained by mixing with other granular material.

In this embodiment, the filler 4 has a two-layer structure of a lower layer 41 and an upper layer 42, but an intermediate layer may be provided between them, and at least the lower layer 41 and the upper layer (uppermost layer) 42 are provided. Other modifications are included in the present invention as long as they are included.

The artificial turf structure of the present invention can be applied to various artificial turf fields such as baseball fields, soccer fields, and tennis courts. Further, even in other artificial turf facilities, the artificial turf properties obtained by the present invention may be arbitrarily selected and constructed.

[0035]

EXAMPLES Next, more specific examples of the present invention will be described together with comparative examples. First, artificial turf containing a filler was produced by the following method.

(Preparation of artificial turf with filler): Preparation of artificial turf polypropylene split yarn 7800 dtex
(Width 12 mm) was tufted with a pile length of 50 mm on a base fabric made of polypropylene plain weave cloth, and then SBR latex rubber was uniformly applied from the back surface to prevent the slip-out prevention process to manufacture artificial turf. : An artificial turf prepared by filling the filler was laid on the base, and the lower layer filler was filled to a thickness of 20 mm. As the filler, a crushed product of a waste tire having a particle size of 0.2 to 3.0 mm occupying 90% or more of the whole was used. Further, the upper layer filler was filled on the lower layer filler under the conditions of Examples 1 to 5 and Comparative Examples 1 to 4. : Water sprinkling For some of the examples and some of the comparative examples, water sprinkling was performed until water did not float on the surface, and then the following various evaluations were performed.

(Observation of Surface Temperature) First, the artificial turf of Examples 1 to 5 and Comparative Examples 1 to 4 was left under the hot sun from 10 to 16 o'clock and the surface temperature was measured. (Observation of Movement of Granular Materials) Next, Examples 1 to 5 and Comparative Example 1
After laying the artificial grass of Nos. 4 to 4, the artificial grass was left as it was for one week, and then the state of holding the uppermost granular material was observed. The evaluation results are shown below.

<< Example 1 >> [Artificial grass specifications] Granular material: foam rubber, color: beige (colored), particle size:
90% or more of 0.2 to 3.0 mm, true specific gravity: 0.8, thickness: 10 mm, water spray: None [Evaluation result] Maximum surface temperature: 65 ° C, scattering state of particulate matter: no remarkable scattering

<Example 2> [Artificial grass specifications] Granular material: polyethylene foam, color: white, particle size: 0.
90% or more in 2 to 3.0 mm, true specific gravity: 0.3, thickness:
10 mm, water sprinkling: none [Evaluation result] Maximum surface temperature: 63 ° C, scattering state of particulate matter: no significant scattering

Example 3 [Specification of artificial grass] Material of granular material: sawdust, color: light brown, particle size: 0.2 to 3.
0mm is 90% or more, true specific gravity: 0.4, thickness: 10m
m, Sprinkling: None [Evaluation result] Maximum surface temperature: 69 ° C, Scattering state of particulate matter: No remarkable scattering

<Example 4> [Artificial grass specifications] Granular material: foam rubber, color: beige (colored), particle size:
90% or more of 0.2 to 3.0 mm, true specific gravity: 0.8, thickness: 10 mm, watering: Yes [Evaluation result] Maximum surface temperature: 58 ° C, scattering state of particulate matter: no significant scattering

Example 5 [Specification of artificial turf] Material of granular material: sawdust, color: light brown, particle size: 0.2-3.
0mm is 90% or more, true specific gravity: 0.4, thickness: 10m
m, sprinkling: Yes [Evaluation result] Maximum surface temperature: 55 ° C, scattering state of particulate matter: No remarkable scattering

<Comparative Example 1> [Artificial grass specification] Granular material: tire crushed product, color: black, particle size: 0.2-
3.0 mm is 90% or more, true specific gravity: 1.1, thickness: 10
mm, Sprinkling: None [Evaluation result] Maximum surface temperature: 72 ° C, Scattering state of particulate matter: No remarkable scattering

Comparative Example 2 [Artificial Grass Specifications] Granular material: foam rubber, color: beige (colored), particle size:
90% or more in 0.2 to 3.0 mm, true specific gravity: 0.8, thickness: 25 mm, water spray: none [Evaluation result] Maximum surface temperature: 65 ° C, scattering state of particulate matter: poor flatness due to scattering

Comparative Example 3 [Artificial Grass Specifications] Granular material: foam rubber, color: beige (colored), particle size:
90% or more of 0.2 to 3.0 mm, true specific gravity: 0.8, thickness: 3 mm, water spray: None [Evaluation result] Maximum surface temperature: 70 ° C, scattering state of particulate matter: lower layer exposed by scattering

<Comparative Example 4> [Artificial grass specifications] Granular material: polyethylene foam, color: white, particle size: 0.
90% or more of 2 to 3.0 mm, true specific gravity: 0.2, thickness:
10 mm, water sprinkling: none [Evaluation result] Maximum surface temperature: 63 ° C, scattering state of particulate matter: poor flatness due to scattering

For reference, the above Examples 1 to 5 and Comparative Example 1
Table 1 summarizes the results of ~ 4.

[0048]

[Table 1]

As a result of comparative examination of the example and the comparative example, the following findings were obtained. -Examples 1 to 5 have a lower surface temperature than Comparative Example 1 due to the effect of the elastic particles having a low heat absorption rate. -Comparative Example 2 has a low surface temperature as in Examples 1 to 5, but the flatness is poor due to scattering because the uppermost layer has a large thickness. -Comparative example 3 has a small effect of suppressing the temperature rise because the filling thickness of the uppermost layer is small. In Comparative Example 4, the true specific gravity of the uppermost layer is small, and the flatness is likely to be impaired due to scattering. -In Examples 4 and 5, the water retention effect by water spraying works, and although the specifications are the same as those of Examples 1 and 2, the temperature rise suppressing effect is higher.

[0050]

As described above, according to the present invention,
In an artificial turf structure in which a filler containing an elastic filler is filled between the piles of the artificial turf, the filler contains a plurality of types of particles having different colors and / or specific gravities, and at least 2 or more of these particles are used. Layer is formed, and the uppermost layer contains a large amount of specific filler with a lower true specific gravity and lower heat absorption coefficient than the lower filler, which effectively scatters the filler. It is possible to suppress the increase in the surface temperature of the artificial turf as well as to suppress it.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an artificial turf according to an embodiment of the present invention.

[Explanation of symbols]

1 artificial grass 2 base cloth 3 piles 4 Filling material 41 Lower layer 411 Elastic granular material 412 Hard granular material 42 Upper layer (top layer)

Claims (6)

[Claims] 1. An artificial turf structure in which a filler containing an elastic filler is filled between the piles of the artificial turf, wherein the filler contains a plurality of types of particles having different colors and / or specific gravities. At least two or more layers are formed by the material, and the uppermost layer thereof contains a large amount of a specific filler having a lower true specific gravity and a lower heat absorption coefficient than the lower filler. Artificial grass structure. 2. The artificial grass structure according to claim 1, wherein the specific filler contained in the uppermost layer is colored in a color having elasticity and a low heat absorption rate. 3. The true specific gravity of the specific filler contained in the uppermost layer is 0.3 to 1.0, and the layer thickness of the uppermost layer is 5 to 20 mm. The artificial turf structure described in. 4. The lower filler includes elastic particles made of waste rubber products such as waste tires, and the specific filler contained in the uppermost layer is colored with a color other than black. The artificial grass structure according to any one of claims 1 to 3, wherein a rubber tip is used. 5. The granular wood material, such as rice husks, sawdust, crushed wood chips, and crushed cork, is used as the specific filler contained in the uppermost layer according to any one of claims 1 to 4. The artificial turf structure described. 6. An artificial turf stadium constructed by the artificial turf structure according to any one of claims 1 to 5.