JP2699749B2 - Line and athletic stadium for artificial turf with sand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line for a stadium made of lawn and a sports stadium which can be easily and easily drawn, is difficult to move, has a clear line, and has excellent durability.

[0002]

2. Description of the Related Art Artificial stadiums, such as those used for baseball, softball, soccer, tennis, hockey, gateball, and athletics, have conventionally used artificial grass containing sand. The lines used for the stadium (competition lines and other marks) may be white or yellow artificial grass, which is different from the color of the green artificial grass for the stadium, embedded and laid with a predetermined width, or lime or plaster etc. A method of drawing a line using powder or further using a line tape and sticking it on artificial grass has been adopted.

[0003]

However, in the method of embedding artificial grass, laying construction is complicated, requires skill and labor, and must be reconstructed for each athletic competition. In that case, There is a problem that the construction becomes more complicated. In addition, the method of drawing powder such as lime or plaster has the disadvantage that the powder is easily scattered by wind and play, the line is easily blurred, and the ball, the player, and even the inside of the stadium are contaminated. For this reason, there is a drawback that when water is used for curing, it is difficult to remove it after use. Furthermore, the method using a line tape has a disadvantage that the tape is very easily peeled off and lacks stability.

[0004] The present invention solves the above-mentioned disadvantages of the prior art, makes it easy and easy to draw a line, and is difficult to move.
The line is clear and durable and has the advantage that it can be easily erased by suction. It is assumed that.

[0005]

The present invention has the following configuration to achieve the above object. That is, the artificial turf-lined sports stadium line of the present invention has an average particle diameter smaller than the average particle diameter of the sand filled in the artificial turf by at least 10 mesh, and passes through a sieve of at least 65 mesh. It is characterized by being composed of a sand composition containing 50% or more of sand, and the athletic stadium of the present invention is configured such that the athletic line is the above-mentioned athletic line. In the athletic stadium of the present invention, in an athletic stadium composed of artificial turf containing sand, at least a 65-mesh sieve is passed over sand filled in the artificial turf. A sand composition having a sand content of 50% or more is filled as a competition line.

[0006]

According to the present invention, a line is drawn (mark setting) on a mark or a line of an athletic stadium composed of artificial grass containing sand.
As a result of examining what is simple, easy, and can maintain the sharpness, and what can easily remove the line, a sieve smaller than sand scattered in the artificial grass and having at least 65 mesh is used. The present invention has been found that when the sand passing through is laminated, the movement of the sand is less likely to occur unexpectedly, and the line (hereinafter simply referred to as a line including the mark) can be maintained sharply. It has been reached.

An important point in the present invention is that the sand used in the line has a particle size smaller than that of the sand sprayed (filled) in the artificial turf. That is, the sand-containing artificial turf is filled with a sand composition mainly composed of slightly larger sand having a particle size of 35 mesh or more. On the other hand, the sand used in the line of the present invention uses a sand composition in which the sand passing through at least a 65-mesh sieve is 50% or more, preferably 60% or more, and more preferably 70% or more. is there. Generally, sand has a particle size distribution in a range of, for example, 20 to 100 mesh.
The sand having a distribution in the content at each particle size (mesh) has a specific range of particle size (mesh), for example, sand having a particle size of 28 to 100 mesh. % Is indicated. That is, it is a sand composition having various particle sizes.
In the above-mentioned sand composition whose main component is sand having a large particle size of 35 mesh or more, for example, sand of 20, 28, and 35 mesh (meaning sand passing through a sieve of the mesh) is 3 to 20% ( % By weight), 25 to 48%, 29 to 45%,
A composition containing a total of 75 to 95%, of course 35%
Usually, a small amount of a mesh smaller than the mesh, for example, a mesh of 48 mesh or 65 mesh is also included.

On the other hand, the sand composition used in the present invention in which at least 50% of the sand passes through at least a 65-mesh sieve means that 48, 65, 100, and 150-mesh sands are 6 to 6 respectively. 50%, 6-35%, 2-47%,
0 to 7%, for a total of 60 to 98%, the composition comprising 20, 28, 35
A small amount of mesh sand may be included as long as the effect of the present invention is not impaired. The sand composition used in the present invention is a composition mainly composed of 65 and 100 mesh sand, and preferably 60% or more, more preferably 80% or more of such mesh sand. . More preferably, a sand composition containing 100 mesh sand more than 60 mesh sand, preferably 5% or more, more preferably 10% or more is good. Of course, such a sand composition may contain a small amount of sand having a large particle size of 48 mesh larger than 65 mesh or 35 mesh or more.

The difference in mesh between the sand filled in the artificial turf of the present invention and the sand used in the line is at least 10 mesh, preferably at least 15 mesh, in terms of average particle diameter. May be excellent. That is, an athletic stadium using sand having an average particle diameter at least 10 mesh smaller than the average particle diameter of the sand filled in the artificial grass as a competition line has a clear line, little disturbance, and there is little referee error. No, you can enjoy a comfortable play.

In the athletic stadium of the present invention, the above specific sand (hereinafter referred to as line sand) is filled in the artificial turf (hereinafter referred to as filled sand) in an athletic stadium composed of artificial turf containing sand. ) And has a line for competition.

The line sand has a mean particle size at least 10 mesh smaller than the mean particle size of the filling sand, and uses a sand composition mainly composed of sand having a smaller particle size of 65 mesh or more. .

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic diagram showing a cross-sectional structure in which a line of the present invention is constructed in an athletic stadium made of artificial grass containing sand.

In this figure, a line sand 1 having a small particle size as described above is used as a line for an athletic stadium made of artificial turf containing sand.
Are stacked on the sand 3 in the artificial turf 2. This artificial turf has a base cloth 4 laminated on a base 6 with a cushion material 5 interposed therebetween.
These laminates may be integrally fixed with an adhesive (adhesive tape) or the like. In the figure, the line sand 1 is depicted as being stacked on the filling sand 3, but actually, in addition to the one placed on the filling sand 3,
It also enters the gap of the filling sand 3, and these integrally constitute a line.

As the filling sand, brown or red sand is usually used. In principle, the line sand 1 only needs to have a smaller particle size than the filling sand 3. A color that is easily noticeable is preferably used. That is, as the line sand 1, a color different from the filling sand 3, for example, a color having a complementary color relationship or a color having a different lightness is used. Specifically, a white or yellow type is preferably used. As the sand, any of artificial colored sand and naturally colored sand can be used.

The artificial turf 2 may be one generally used for artificial turf containing sand. For example, a pile yarn made of a synthetic resin such as polyamide, polyethylene terephthalate, polypropylene, or polyvinylidene chloride is coated with a base cloth 4 by tufting or the like. Can be used. As the base cloth, a cloth made of polypropylene, polyethylene terephthalate, or the like can be used, but from the viewpoint of the hardness of the product, a cloth made of polypropylene is preferable. The above-mentioned cushion material 5 is made of chloroprene, SBR
It is composed of a rubber-based resin such as (styrene / butadiene) or an olefin-based resin such as polypropylene, but an olefin-based foam is preferably used from the viewpoint of buffering properties. The base 5 of the stadium may be either asphalt concrete or soil.

The line sand 1 of the present invention is used to mark an arbitrary sports competition line, and then, along the line, an amount of, for example, about 200 to 400 g / m 2 is applied to the artificial grass for a stadium. Are drawn by using a simple marker or the like to draw a line. Since the line sand can be easily absorbed by a sweeper or the like, there is an advantage that when the line needs to be changed, it can be easily erased.

[0017]

The present invention will be further described below with reference to examples. Example 1, Comparative Example 1 A 2 m square structure for an athletic stadium composed of artificial grass containing sand having the structure of FIG. 1 was prepared, and a sand composition (A) composed of white sand shown in Table 1 was prepared. Example 1) 250 g using the sand composed of (B) (Comparative Example 1) with simple markers, respectively.
/ M2 and a 10cm wide competition line was drawn. Table 1 also shows the particle size distribution of the filled sand.

The evaluation was made in a line state after walking 100 times.

[0019]

[Table 1] As a result, in the line of Example 1, the movement of the line sand was controlled as a whole even after the above-described walking test, and the line width was approximately 20% at the maximum of the widened and diffused portion. However, in the case of the comparative example, the movement of the sand was intense, and the line width was 30% where the line width was small.
The terrible parts were spread more than 50% widely, and the lines were blurred.

[0020]

According to the present invention, it is possible to easily and easily form a temporary line in a multipurpose stadium in a game scene, and it is easy to remove the line. There is an advantage that determination can be made easily.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cross-sectional structure in which a line of the present invention is constructed in an athletic stadium made of artificial grass containing sand.

[Explanation of symbols]

 1: Line sand 2: Artificial grass 3: Filling sand 4: Base cloth 5: Cushion material 6: Base

Claims (6)

(57) [Claims] 1. The average particle size of sand filled in artificial grass
Has an average particle size smaller by at least 10 mesh, and
50% or more of sand passing through sieve of at least 65 mesh
A line for an athletic stadium made of artificial turf containing sand, comprising a sand composition containing the sand . Wherein said at least the amount of sand that passes a 65 mesh sieve, artificial grass made athletic field for a line according to claim 1, wherein 70% or more. 3. Passing through the at least 65 mesh sieve.
Is made of sand of a different color from the sand filled in the artificial grass.
The artificial turf containing sand according to claim 1 or 2, which is formed.
Athletics line . 4. The athletic competition according to claim 1,
An athletic stadium characterized by a competition line comprising a technical line . 5. In an athletic stadium composed of artificial grass containing sand, at least on sand filled in the artificial grass ,
Athletic field sand also be passed through the 65 mesh sieve is characterized by being filled with sand composition is 50% or more as athlete for line. 6. The athletic stadium made of artificial turf with sand according to claim 4, wherein the athletic line is made of sand having a color different from the color of the sand filled in the artificial turf.