JP4789213B2 - Artificial grass - Google Patents

Description

  The present invention relates to an artificial lawn in which two types of turf leaves are mixed.

  As an artificial lawn in which two kinds of turf leaves are mixed, for example, in an athletic stadium made of artificial lawn where artificial lawn is laid on a base and sand is filled in the lawn, An artificial turf athletic stadium is disclosed which is planted on a backing base fabric in a state in which polypropylene fibers are twisted together (for example, Patent Document 1).

No. 6-9042

  However, in the conventional artificial lawn as described in the cited document 1, since fibers of different synthetic resin materials are twisted together, the tactile feeling depends on the harder synthetic resin material, which is shown in the cited document 1. In artificial grass, when touching the surface of artificial grass, or overturning or sliding on artificial grass, only the hard touch of nylon fiber is transmitted, making it difficult to obtain the preferable touch as artificial grass Met.

  The present invention has been made in view of the problems as described above, and an object is to provide an artificial lawn that can provide a favorable tactile sensation even when a plurality of types of turf leaves are mixed.

In order to achieve the above object, the present invention is configured as follows. That is, the artificial turf according to the present invention includes a first turf leaf and a second turf leaf made of synthetic resin, and the first turf leaf and the second turf leaf have different cross-sectional shapes. The second moment of the cross section of the first turf leaf is more than twice the second moment of section of the second turf leaf, and the first turf leaf and the second turf leaf are made of the same material . The turf leaf and the second turf leaf are formed with different cross-sectional shapes selected from five different cross-sectional shapes consisting of an oval shape, a horizontally long semicircular shape, a horizontally long semicircular shape, a horizontally long rectangular shape, and a horizontally long rhombus shape. Due to the difference in cross-sectional shape, the cross-sectional secondary moment of the first turf leaf is more than twice the cross-sectional secondary moment of the second turf leaf .

  According to the artificial lawn according to the present invention, it is possible to use a mixture of a plurality of types of turf leaves because the cross-sectional secondary moment of the first turf leaves is more than twice that of the second turf leaves. Since the first turf leaves and the second turf leaves are made of the same material, the surface properties of both turf leaves are the same, and the tactile sensation can be made favorable.

  In addition, if the first turf leaf and the second turf leaf are made of polyethylene resin, the turf leaf made of polyethylene resin has a soft material and good tactile sensation. It is preferable to make it difficult to fall down while maintaining a good tactile sensation.

  According to the artificial lawn according to the present invention, it is possible to use a mixture of a plurality of types of turf leaves because the cross-sectional secondary moment of the first turf leaves is more than twice that of the second turf leaves. Since the first turf leaves and the second turf leaves are made of the same material, the surface properties of both turf leaves are the same, and the tactile sensation can be made favorable.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment according to the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing an embodiment of an artificial lawn according to the present invention. The artificial lawn 10 is of a long lawn type called a long pile, and a polyethylene resin turf leaf 1 is planted on a polypropylene resin base fabric 2 and the turf leaf 1 is planted. An SBR backing material 3 is provided on the back surface of the SBR. The turf leaf 1 comprises a first turf leaf 11 and a second turf leaf 12. In the figure, the first turf leaf 11 and the second turf leaf 12 are planted one by one at the same time for convenience. However, usually 3 to 6 trees are planted at the same time.

  The first turf leaf 11 has a cross-sectional secondary moment more than twice that of the second turf leaf 12. Due to the difference in the cross-sectional second moment, the first turf leaf 11 is less likely to fall than the second turf leaf 12. When applied to, the ball is prevented from rolling too much by holding the state where the first turf leaf 11 is upright, and the scattering of the filler is suppressed when the second turf leaf 12 is lying down. Can maintain the performance as a ground. The cross-sectional secondary moment of the first turf leaf 11 may be two times or more than that of the second turf leaf, more preferably three times or more.

  FIG. 2 is a cross-sectional view showing an example of the cross-sectional shape of the turf leaf 1. (A), (b) and (c) are shapes suitable for use as the first turf leaf, and (d) and (e) are shapes suitable for use as the second turf leaf. is there. (A) is an oval shape, (b) is a horizontally long semicircular shape, and (c) is a horizontally long semicircular shape. However, the shape having a curved side surface such as these shapes has a relatively high secondary moment of section. It is done. On the contrary, when the side surface is flat and the aspect ratio is large, such as the horizontally long rectangular shape of (d) and the horizontally long rhombus shape of (e), the second moment of section is relatively low.

  Table 1 shows the calculated values of the cross-sectional secondary moment provided when the low-density polyethylene is used as the material for forming the turf leaves 1 and has the following vertical and horizontal dimensions in the shape.

  When (a), (b) or (c) is used as the first turf leaf and (d) or (e) is used as the second turf leaf, the cross-sectional secondary moment of the first turf leaf Is 3.85 to 7.22 times the moment of inertia of the second turf leaf, and it is revealed that the first turf leaf is much less likely to fall than the second turf leaf.

  If the first turf leaf 11 and the second turf leaf 12 are distributed in a nearly uniform shape on the base fabric, the above-described effects can be obtained. The ratio of the number of turf leaves 12 is preferably about 2: 8 to 8: 2. In order to project turf leaves on the base fabric, a method of planting 4 to 12 turf leaves in a shape to be sewn and projecting from the base fabric by cutting the loop portion at the tip Is convenient and often used. The lawn leaves planted by this method may be planted at appropriate intervals, but considering the ease of filling with the filler, the vertical direction is planted at intervals of about 5 to 10 mm, and the horizontal direction is 10 mm. If it is planted at intervals of about ˜30 mm and the interval in either the vertical or horizontal direction is widened, the work related to filling of the filler becomes easy, which is preferable.

  In addition, when using a filler, when using it as a playground such as soccer or rugby, a mixture of rubber chip and sand is used as the filler, but the rubber chip is mixed in a weight ratio of about 0.3 to 1.2. It is preferable to increase the amount of rubber chips as the protruding length from the base fabric of turf leaves increases.

  Next, effects obtained by applying the artificial lawn according to the present invention will be described with reference to examples.

Example 1
From the top surface of the base fabric made of polypropylene resin, the first turf leaves shown in (a) above and the second turf leaves shown in (d) above are spaced at intervals of 6.8 mm vertically and 19.1 mm horizontally. Each piece is projected with a length of 65 mm, and between the turf leaves, a rubber chip having a particle size distribution of less than 3.0 mm and less than 90% and less than 0.5 mm and less than 10%, and a particle size distribution of less than 1.68 mm and more than 90% and 0. Artificial lawn ground using the artificial lawn of Example 1 according to the present invention by filling a filler in which the weight ratio of 1: 1 is 21 mm and 10% or less of sand is filled with a thickness of 40 mm from the upper surface of the base fabric. Formed.

(Comparative Example 1)
An artificial lawn ground using the artificial lawn of Comparative Example 1 was obtained in the same manner as in Example 1 except that only those shown in (a) were used as the turf leaves.

(Comparative Example 2)
An artificial lawn ground using the artificial lawn of Comparative Example 2 was obtained in the same manner as in Example 1 except that only those shown in (d) were used as the turf leaves.

  On the artificial turf ground using the artificial turf of Example 1 and Comparative Examples 1 and 2, the pitch official inspection (field test) described in the Japan Football Association Long Pile Artificial turf-Inspection Implementation Manual (3rd edition) ), The test specified in the ball rolling distance inspection was conducted. This test rolls the Japan Football Association test ball from a height of 1 m on a rail inclined at 45 °, measures the distance the test ball rolls, and repeats the test five times to obtain an average value. The standard value shown by the Japan Football Association is said to have an average value in the range of 4-10 m.

  Furthermore, on the artificial lawn ground using the artificial lawn of Example 1 and Comparative Examples 1 and 2, a 90-minute soccer game was performed, and the degree of scattering of the filler after the game was visually confirmed. Table 2 shows the results of the above two types of tests.

  Although the ball rolling distance satisfies the standard value shown by the Japan Football Association in both the example and the comparative example, this test was performed with the artificial lawn in a new state, and was used as Comparative Example 2 (d It is presumed that the grass leaves having a small cross-sectional secondary moment as shown in FIG. In addition, when only the turf leaves having a large cross-sectional second moment as used in Comparative Example 1 are used, the turf leaves rise too much, and the scattering of the filler is larger than that in Example 1. Has been.

It is a longitudinal section showing one embodiment of an artificial lawn concerning the present invention. It is sectional drawing which shows the example of the turf leaf used for the artificial lawn which concerns on this invention.

Explanation of symbols

1 Lawn leaf 11 First lawn leaf 12 Second lawn leaf 10 Artificial lawn

Claims (2)

The first turf leaf and the second turf leaf made of synthetic resin are included, and the first turf leaf and the second turf leaf have different cross-sectional shapes so that the second moment of section of the first turf leaf is The first turf leaf and the second turf leaf are made of the same material, and the first turf leaf and the second turf leaf are made of the same material. Are formed in different cross-sectional shapes respectively selected from five different cross-sectional shapes consisting of an oval shape, a horizontally long semicircular shape, a horizontally long semicircular shape, a horizontally long rectangular shape, and a horizontally long rhombus shape. An artificial lawn characterized in that the cross-sectional secondary moment of one turf leaf is more than twice the cross-sectional secondary moment of the second turf leaf . The artificial lawn according to claim 1, wherein the first turf leaves and the second turf leaves are made of polyethylene resin.

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