JP2000314103A - Artificial grass - Google Patents

Abstract

(57) [Summary] [Problem] To make various properties of an artificial turf containing sand approximate to a natural turf by setting a lawn height and a filler height to specific heights. SOLUTION: The height of the grass from the upper surface of the base cloth 2 to the tip of the artificial grass yarn P is H, the height of the filler 5 is h, and the height of the grass is H
Satisfies H ≧ 30 mm, and the filler height h is h ≧ 1
It is configured to satisfy 0 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf applied to various facilities, and more particularly, to an artificial turf having various properties close to natural turf and particularly suitable for golf facilities.

[0002]

2. Description of the Related Art Artificial turf has rapidly spread as a substitute for natural turf mainly in tennis courts and driving ranges since the 1980's, and is currently used in various facilities such as baseball fields and soccer fields. . In the meantime, efforts have been continuously made to bring its properties closer to natural grass.

[0003] An early problem was that the surface of artificial grass was harder than natural grass. As one method for solving this problem, a sand layer is filled in the grass to provide a deformed layer (buffer layer) (so-called artificial grass with sand). The basic philosophy of this technique is still being carried over, but simply filling the sand with sand will cause the sand to be squeezed by the athlete's treading, etc., and the artificial turf surface will gradually become harder.

[0004]

The following improvements have been made. That is, an elastic mat is arranged between the artificial grass and the ground side base layer, a curl yarn having a spring effect is adopted for the artificial grass yarn, and as another method, an elastic grain such as a rubber chip is applied to the sand. Various studies have been made to lower the hardness of the artificial turf surface, for example, by mixing water.

[0005] However, these methods are still insufficient, and have not yet achieved the softness of natural grass, such as soil. By the way, according to the above-mentioned conventional technology, the artificial turf surface tends to be too soft, and for example, instability such as trampoline appears.

[0006]

Means for Solving the Problems The present inventor has conducted intensive studies in order to solve such problems, and as a result, has found that the length of the artificial turf yarn (turf length) and the filling amount of the filler (filling layer). By optimizing the height of the artificial grass, the characteristics of the so-called artificial turf containing sand can be approximated to that of a natural turf without using an elasticity imparting means such as an elastic mat or an elastic granule.

That is, in order to solve the above-mentioned problems, the present invention uses a base fabric or the like as a deformation constraining layer, in which a large number of artificial grass yarns are planted on the deformation constraining layer, and the grass In an artificial lawn in which a filler such as sand is filled in a layered manner, the height of a lawn from the upper surface of the deformation constraining layer to the tip of the artificial lawn is H, and the height of the lawn laminated on the deformation constraining layer is H Assuming the height h of the filler, the grass height H satisfies H ≧ 30 mm, and the filler height h
Satisfies h ≧ 10 mm.

As described above, by specifying the lawn height H and the height of the filler h, a synergistic effect of the artificial lawn (pile) and the filling layer such as sand is exerted, and the person stands. The so-called stepping is effective in a state of walking or walking, and a softness and a sense of stability close to the soil unique to natural lawn can be obtained. In this case, if the lawn height H is 40 mm or more,
Since a fibrous feel like that of a natural turf root is produced, a more preferable state can be obtained.

[0009] From the microscopic point of view, the heights of the artificial grass yarns are not all the same but have some length. In addition, the surface of the sand-filled layer has some irregularities. Therefore, the lawn height H and the height h of the filler are referred to here.
Are average values or design values.

According to a preferred embodiment of the present invention, the difference (Hh) between the grass height H and the filler height h is 0 mm ≦ Hh ≦
The filling amount W per square meter of the filler is set to 15 kg / m ² or more.

[0011] According to this, the fibrous contact feeling (softness) of the artificial turf is added to the softness of the filling layer, so that the softness as a whole can be obtained as the soil, and the player becomes intense. The artificial turf surface can be maintained in a stable state even when exercise is performed.

In particular, if the difference (Hh) between the height H of the grass and the height h of the filler is 5 mm or more, soft resistance by the artificial grass can be added to the artificial grass surface, and the feeling of contact with the ground can be further improved. It will be good. If the difference (Hh) is 25 mm or less,
The artificial turf yarn does not fall down too much, and a better touch feeling can be obtained similarly.

By the way, the difference (Hh) is minus,
In other words, when (Hh) <0, the sand immediately flows due to rainfall or the like, and the sand is exposed on the turf surface, resulting in an undesirable appearance.

In a preferred embodiment of the present invention, if the filling weight W of sand or the like is 30 kg / m ² or more, the sense of stability of the laid state of the artificial turf is increased, and the filling height h is made 30 mm or more. Not only stability but also softness can be increased due to the thickness of the filler layer.

As the filler, considering the ease of filling between grasses (between piles), organic and organic materials such as sand and beads are used.
Inorganic small particles are preferred, and specifically those having a particle size of 3 mm or less are preferred. Elastic particles such as rubber chips and cork can also be used.

In addition to the above-mentioned granular material as a filler, an elastic mat may be arranged on a deformation constraining layer such as a base cloth, and such an embodiment is also included in the present invention. In this case, the elastic mat is laminated on the deformation constraining layer, and artificial grass is planted through the elastic mat and the deformation constraining layer. However, the elastic mat may be further filled with sand, rubber chips, or the like. .

In short, in the present invention, the filler is located in the grass above the deformation constraining layer, and includes any material having deformability and / or fluidity, particularly in the form of a mat (sheet) or a granular material. It does not matter whether it is different. Therefore,
Even when an elastic mat is used as the filler, the height h of the filler is the height measured from the upper surface of the deformation constraining layer.

When the filler is inserted between the grasses, it is preferable that at least the surface layer side of the artificial turf surface is filled with a green-colored filler. It can approximate a lawn. Note that various fillers such as colored sand or crushed green natural stone may be used as the green filler.

The deformation constraining layer is a so-called base material of the artificial turf, and may be, for example, a plain woven base fabric, a nonwoven fabric or a sheet material. Various synthetic resin yarns such as polyethylene, polypropylene, and polyamide are used for the artificial turf yarn, and are planted in a pile on the deformation constraining layer.

In particular, when the gap between the pile tip and the filling layer is wide, that is, when the difference (Hh) is large,
The pile is preferably made of a material such as nylon, which has a high uprightness, and has a high settling resistance and a high bending resistance. Also,
As the shape of the pile, a monofilament having a good contact feeling is preferable.

[0021]

Next, an embodiment of the present invention will be described with reference to FIG. The embodiment described below is an example of the present invention, and the present invention is not limited to the embodiment. The present invention naturally includes equivalent techniques easily conceivable to those skilled in the art.

The artificial turf 1 has a base cloth 2 as a deformation constraining layer, and the base cloth 2 has a large number of artificial turf yarns (pile).
P is implanted so as to stand on the upper surface side. The deformation constraining layer may be a nonwoven fabric or a sheet material. The artificial grass yarn P is fixed on the back side of the base fabric 2 by a backing material 3 made of, for example, SBR (styrene butadiene rubber).

The artificial turf 1 is laid on the base layer 4 of the base G, but in the present invention, the material of the base layer 4 is not particularly limited. For example, asphalt (preferably water-permeable asphalt) may be used, or a non-slip sheet, concrete, mortar, or other stabilized soil may be used.

After being laid on the ground G, sand 5a, for example, is sprayed on the artificial grass 1 as a filler, and the sand 5a is filled in the grass with a brush or the like. Reference numeral 5 is
This shows a packed layer of sand 5a. Instead of sand, artificially made bead-shaped granules may be used. The material may be either organic or inorganic. There is no particular limitation.

In FIG. 1, the height of the turf yarn from the upper surface of the base cloth 2 to the tip of the artificial turf yarn P is H, and the filler 5a
Assuming that the filler height (filler layer thickness) is h, in the present invention, the lawn yarn height H is 30 mm or more, and the filler height h is 10 mm or more.

Thus, the artificial turf 1 can be given a feeling as if it were obtained from the soil of a natural turf. More specifically, the relationship between the height H of the turf yarn and the height h of the filler and the unit area ( The filling amount W of the filler per 1 m 2 may be set as follows.

That is, the difference (Hh) between the lawn height H and the filler height h is set in the range of 0 mm ≦ Hh ≦ 30 mm. Further, the filling amount W of the filler (the sand 5a in this example) is set to 1
5 kg / m ² or more. According to this, even when a person exercises violently such as running or jumping, a stable artificial grass is constructed. Further, the synergy of the fibrous contact feeling of the artificial turf yarn 2 and the filling layer 5 makes it possible to obtain softness like natural lawn.

More preferably, by setting (Hh) ≧ 5 mm, a soft resistance by the artificial turf yarn 2 can be added to the turf surface, and the feeling of grounding is improved. Also, (H−h) ≦ 2
By setting it to 5 mm, a good feeling of grounding can be obtained without the artificial grass thread 2 protruding too much and falling down too much.

When (Hh)> 30 mm, the artificial turf yarn 2 protrudes too much from the filling layer 5 and the turf surface becomes unstable. In the case of (Hh) <0, when rain falls, the filler 5a is washed away from the turf surface, resulting in an uneven surface, which is not preferable.

According to a preferred embodiment of the present invention, the filling amount W
Is required to be 15 kg / m ² or more, but by further increasing the amount to satisfy W ≧ 30 kg / m ² , not only the sense of stability of the artificial turf 1 but also the softness due to the thickness of the filling layer 5 Can be increased. Also, the lawn height H
Is set to 40 mm or more, the artificial turf yarn 2 can create a fiber texture similar to the root of natural turf.

[0031]

EXAMPLES Hereinafter, specific examples of the present invention and comparative examples will be described. The configuration of the artificial grass used in each example is as follows.

As an artificial turf yarn (pile), 12 bundles of 12-d nylon monofilament yarns of 600 d
After tufting on a plain weave base fabric made of polypropylene so as to obtain a predetermined lawn length with 6 Ge (gauge) and 5.0 St (stitch), SBR (styrene butadiene rubber) is mainly used on the back surface of the base fabric. Apply the backing material,
The artificial turf yarn was fixed by heating and curing.

The artificial turf thus produced is laid on an asphalt ground, and a predetermined amount of sand for turf (trade name) made by Sumitomo Rubber Industries, Ltd. for artificial turf is filled between the grasses.
It was sandy artificial grass.

Then, various evaluations were made. The evaluation method uses the actual hitting style of golf, which requires a sense of stability, softness of the surface, and a feeling of contact with the turf. Twenty golf players stance and touch the ground of the golf club during a series of operations. I got comments mainly on feelings and missing clubs. The evaluation parameters were as follows.

Stance stance: how stable when taking a stance Do you wobble? Softness of the turf surface: Is the club touching the ground soft? Is it too hard to take a stance? Sliding on the grass: Is the club okay to slip out? Tee-up property: Is tee-up possible? Does tea stand stably?

The scoring is based on natural grass.
The average of each item was taken as the final score. The final rating is 4 grades, all of which are very good for natural lawn, ◎ for good match, ○ for good match, △ for a little match.
Not matching was evaluated as x.

On the basis of the final score for each of these items, an overall comprehensive evaluation was made, and
Good was evaluated as ○, slightly good as Δ, and poor as ×. In addition, as a result of scoring the evaluation parameters and the overall evaluation of each item, in any case, even if it is slightly good, it is a level that does not cause any problem in actual use.

<< Example 1 >> [Specifications] Grass thread height H = 30
mm, filler height h = 10 mm, and the difference (H−h) = 2
0 mm, filling amount W = 15 kg / m ² [Evaluation parameters] Stability of the stance: The filling amount W of the filler (sand) is slightly smaller, but is not inferior to the stability of the natural lawn. No problem, the evaluation was negative. Softness of turf surface: (Hh) was 20 mm, so that a moderately softness was obtained due to the softness of the turf yarn. The evaluation was ○. Slip on the grass surface: The club was well removed, and the evaluation was ○. Tee-up property: The evaluation was rated as △ to ×, since there was some anxiety in the insertion and stability of the tee. [Comprehensive evaluation] Although the filling amount W of the filler material was slightly smaller, there were some problems in the sense of stability and tee-up properties as compared with natural grass, but the softness of the grass surface and the slip of the grass surface were Since it was good, it was generally evaluated as △-総 合.

Example 2 [Specifications] Grass thread height H = 30 mm, filler height h = 20
mm, difference (H−h) = 10 mm, filling amount W = 30 k
g / m ² [Evaluation parameters] Stance of stance: Stability was good due to the large amount of sand W, and the evaluation was △ to △. Softness of turf surface: Compared with Example 1, the filling height of the sand was about 10 mm larger, and the lawn yarn was harder to fall by that much.
△ was given. Grass slippage: The evaluation was rated as “△” because the resistance of sand was felt. Tee-up property: improved compared to Example 1,
The evaluation was △. [Comprehensive evaluation] Although stability and tee-up properties were improved, a feeling of resistance to turf sliding was felt.

Example 3 [Specifications] Grass thread height H = 30 mm, filler height h = 30
mm, the difference (H−h) = 0 mm, filling amount: W = 45 k
g / m ² [Evaluation parameters] Stability of the stance: The sand is filled up to the grass surface and the filling amount W is large, so that the feeling of stability is very good, and the evaluation is ◎ ~
○ Softness of turf surface: As in Example 2, evaluations of O to △ were obtained. Grass slippage: Since the resistance of sand was felt, the evaluation was △ as in Example 2. Tee-up property: Both the feeling of inserting the tee and the stability of the tee were good, and the evaluation was ○ to △. [Comprehensive evaluation] The stability was very good and the tee-up property was also good.

Example 4 [Specifications] Grass thread height H = 40 mm, filler height h = 10
mm, the difference (H−h) = 30 mm, and the filling amount W = 15 k
g / m ² [Evaluation parameter] Stance sense of stance: The filling amount W of the sand was slightly small and (H−h) was 30 mm, so that the grass yarn slightly fell, but the natural grass Since there was no inferiority to stability, there was no problem in actual use, and the evaluation was evaluated as “△”. Softness of turf surface: Since the turf yarn height H was as long as 40 mm and (Hh) was 30 mm, it was extremely good. Grass slippage: good resistance with almost no sand resistance felt. Tee-up property: As in Example 1, since anxiety was felt in the insertion of the tee, the evaluation was evaluated as Δ to ×. [Comprehensive Evaluation] Although stability and tee-up properties were subject to deduction, the softness of the turf surface and the good sliding of the turf surface were evaluated as △ to Δ overall.

Example 5 [Specifications] Grass thread height H = 40
mm, filler height h = 20 mm, and the difference (H−h) = 2
0 mm, filling amount W = 30 kg / m ² [Evaluation parameters] Stability of stance: The feeling of stability was good because the filling amount W of sand was large, and the evaluation was ○ to Δ. Softness of turf surface: Since the synergistic effect of softness of turf yarn and softness of sand was sufficiently exhibited, and the softness was comparable to that of natural grass, the evaluation was ◎ to 〜. Slip on the grass surface: The resistance of the sand was hardly felt and was good. Tee-up property: There is another feeling in the feeling of tea insertion and stability, and the evaluation was rated as “△”. [Comprehensive evaluation] Since only the tee-up property was another step, it was comprehensively evaluated as ○.

Example 6 [Specifications] Grass thread height H = 40 mm, filler height h = 30
mm, the difference (H−h) = 10 mm, and the filling amount W = 45 k
g / m ² [Evaluation parameter] Stability of stance: Very similar to natural lawn, and evaluation was ◎ to Δ. Softness of turf surface: The synergistic effect of softness of turf yarn and softness of sand was sufficiently exhibited, which was better than Example 5, and the evaluation was ◎. Slip on the grass surface: The resistance of the sand was hardly felt and was good. Tee-up property: Both the feeling of inserting the tee and the stability of the tee were good, and the evaluation was ○. [Comprehensive evaluation] The stability, the softness, the sliding of the turf surface and the tee-up property were all good.

Example 7 [Specifications] Grass thread height H = 40 mm, filler height h = 40
mm, the difference (H−h) = 0 mm, the filling amount W = 60 kg
/ M ² [Evaluation parameters] Stance of stance: Very good, evaluation was ◎. Softness of turf surface: Synergistic effect of softness of turf yarn and softness of sand is sufficiently exhibited, and evaluation is ◎ same as in Example 6.
And Grass slippage: Some resistance of sand was felt, and the evaluation was 〇 to △. Tee-up property: Both the feeling of inserting the tea and the stability of the tea were good, and the evaluation was ◎ to ○. [Comprehensive evaluation] Although the evaluation of the sliding on the turf surface was slightly low, the stability, softness and tee-up property were good.

Example 8 [Specifications] Lawn height H = 50 mm, filler height h = 10
mm, the difference (H−h) = 40 mm, and the filling amount W = 15 k
g / m ² [Evaluation parameter] Stance sense of stance: The filling amount W of the sand was slightly small, and (H−h) was 40 mm, so that the grass yarn slightly fell. Therefore, the evaluation was negative. Softness of turf surface: Since (H-h) is 40 mm, softness due to turf yarn is felt exclusively, and the evaluation is ◎
And Slip on the grass surface: The grass thread height H was as long as 50 mm, and (Hh) was 40 mm, and the grass thread resistance was felt somewhat strong. Tee-up property: The evaluation was rated as △ to × because the tee insertion and the sense of stability were somewhat uneasy. [Comprehensive evaluation] Since the evaluation of stability and tee-up property was rather low, the overall evaluation was ① to △.

Example 9 [Specifications] Grass thread height H = 50 mm, filler height h = 20
mm, the difference (H−h) = 30 mm, and the filling amount W = 30 k
g / m ² [Evaluation parameter] Stance of stance: (Hh) was 30 mm, and the grass yarn was slightly collapsed, so the evaluation was evaluated as Δ to Δ. Softness of turf surface: Synergistic effect of softness of turf yarn and softness of sand is sufficiently exhibited, and evaluation is ◎ as in Example 5.
~ 〇 Grass slippage: Since resistance of grass and sand was hardly felt, the evaluation was ◎ to ◎. Tee-up property: The evaluation was rated as “△” because the tee insertion and the sense of stability were somewhat uneasy. [Comprehensive evaluation] Since the evaluation of stability and tee-up property was not yet satisfactory, it was comprehensively evaluated as 〇.

Example 10 [Specifications] Grass thread height H = 50 mm, filler height h = 30
mm, the difference (H−h) = 20 mm, and the filling amount W = 45 k
g / m ² [Evaluation parameters] Stability of stance: Similar to Example 6, very similar to natural lawn, and evaluated as ◎ to Δ. Softness of turf surface: The synergistic effect of softness of turf yarn and softness of sand was sufficiently exhibited, and the evaluation was evaluated as ◎. Sliding on the grass surface: The resistance of grass yarn and sand was hardly felt and was extremely good. Tee-up property: Both the feeling of inserting the tea and the sense of stability were good, and the evaluation was rated as Δ. [Comprehensive evaluation] The stability, softness, slip on the grass surface and tee-up property were all good, and the overall rating was ◎.

Example 11 [Specifications] Grass thread height H = 50 mm, filler height h = 40
mm, the difference (H−h) = 10 mm, and the filling amount W = 60 k
g / m ² [Evaluation parameters] Stance of stance: Very good ◎. Softness of turf surface: The synergistic effect of softness of turf yarn and softness of sand was sufficiently exhibited, and the evaluation was evaluated as ◎. Sliding on the grass surface: The resistance of grass yarn and sand was hardly felt and was extremely good. Tee-up property: Both the feeling of inserting the tea and the feeling of stability were good, and the evaluation was ◎ to 〇. [Comprehensive evaluation] The stability, softness, slip on the grass surface and tee-up property were all good, and the overall rating was ◎.

Example 12 [Specifications] Grass thread height H = 50 mm, filler height h = 50
mm, the difference (H−h) = 0 mm, the filling amount W = 75 kg
/ M ² [Evaluation parameters] Stance of stance: Very good ◎. Softness of turf surface: The synergistic effect of softness of turf yarn and softness of sand was sufficiently exhibited, and the evaluation was evaluated as ◎. Grass slipping: The evaluation was rated as 〇 because the sand resistance was felt, albeit slightly. Tee-up property: Both the feeling of inserting the tea and the feeling of stability were good, and the evaluation was ◎ to 〇. [Comprehensive evaluation] Because the evaluation of turf sliding was slightly lower,
Comprehensively ◎ to 〇.

Example 13 [Specifications] Grass thread height H = 70 mm, filler height h = 10
mm, the difference (H−h) = 60 mm, the filling amount W = 15 k
g / m ² [Evaluation parameter] Stance of stance: The filling amount W of the sand was rather small and (H−h) was 60 mm, so that the grass yarn slightly fell. Therefore, the evaluation was negative. Softness of turf surface: Since (Hh) was 60 mm, softness was solely felt by turf yarn, and き わ め て was extremely excellent. Grass slipping: The evaluation was rated as “〇” because the resistance of the grass was felt. Tee-up property: Since both the feeling of inserting the tea and the feeling of stability were not so good, the evaluation was evaluated as Δ to ×. [Comprehensive evaluation] The points of stability and tee-up property were deducted, and the comprehensive evaluation was evaluated as 〇 to △.

Example 14 [Specifications] Grass thread height H = 70 mm, filler height h = 40
mm, the difference (H−h) = 30 mm, and the filling amount W = 60 k
g / m ² [Evaluation parameters] Stability of stance: Similar to Example 6, very similar to natural lawn, and evaluated as ◎ to Δ. Softness of turf surface: Softness of sand was exhibited more than turf yarn, and the evaluation was evaluated as ◎, which is extremely good. Grass slipping: The evaluation was rated as “〇” because the resistance of the grass was felt. Tee-up property: Both the feeling of inserting the tea and the sense of stability were good, and the evaluation was rated as Δ. [Comprehensive evaluation] Because the evaluation of turf sliding was slightly lower,
Comprehensively ◎ to 〇.

Comparative Example 1 [Specifications] Grass thread height H = 20 mm, filler height h = 10
mm, the difference (H−h) = 10 mm, and the filling amount W = 15 k
g / m ² [Evaluation parameters] Stance of stance: There is little sand and the stability is not very good (evaluation is Δ). Soft turf surface: Short turf height, turf yarn (pile)
Is not obtained (evaluation is ×). Slip on the grass: There is no softness, so the resistance is large (evaluation is △). Tee-up property: Neither the feeling of insertion nor the sense of stability of the tea are very good (evaluation: Δ to ×). [Comprehensive evaluation] All of the properties of stability, softness of the turf surface, slip of the turf surface, and tee-up property were not good, and all were Δ to ×.

Comparative Example 2 [Specifications] Grass thread height H = 20 mm, filler height h = 20
mm, the difference (H−h) = 0 mm, the filling amount W = 30 kg
/ M ² [Evaluation parameter] Stance of stance: Since the amount of sand is larger than that of Comparative Example 1,
Slightly inferior to natural lawn (evaluation is ○ ~ △). Soft turf surface: Short turf height, turf yarn (pile)
Is not obtained (evaluation is ×). Slip on the grass surface: The resistance of the grass yarn and the resistance of the sand are felt (the evaluation is ×). Tee-up property: The feeling of inserting tea and the feeling of stability were slightly improved as compared with Comparative Example 1 (evaluation is Δ). [Comprehensive evaluation] Comparative Example 1
Although slightly improved than the above, the overall evaluation was Δ △ ×.

<Comparative Example 3> [Specifications] Grass thread height H = 30 mm (artificial grass without sand) [Evaluation parameters] Stability of stance: No stability like natural grass (Evaluation is x). Softness of turf surface: There is no softness like a natural lawn (evaluation is ×). Slip on the grass surface: A so-called bottoming phenomenon appeared (evaluation: △ to ×). Tee-up property: Both the insertion property and the stability of the tea are not good (the evaluation is x). [Comprehensive evaluation] Since sand was not filled, a bottoming phenomenon appeared, and all the evaluations were poor.

Comparative Example 4 [Specifications] Grass thread height H = 30 mm, filler height h = 7.
5 mm, difference (H−h) = 22.5 mm, filling amount W =
11 kg / m ² [Evaluation Parameters] Stance of Stance: The stability is poor because the amount of sand is smaller than the height of the lawn yarn (evaluation is ×). Softness of turf surface: Since (H-h) is as large as 22.5 mm, softness due to turf yarn was felt (evaluation: Δ). Slip on the grass surface: Although not as much as Comparative Example 3 without sand, a bottoming phenomenon still appeared (evaluation is Δ). Tee-up property: Still not good in both the injectability and stability of the tee (Evaluation is ×). [Comprehensive evaluation] Even if the grass thread height H is 30 mm, the filler height h is 7.5 mm, and the filling amount W is 11 kg /.
for small and m ^2, still not eliminated the bottom with a phenomenon, the overall was △ ~ ×.

<Comparative Example 5> [Specifications] Grass thread height H = 40 mm (artificial grass without sand) [Evaluation parameters] Stability of stance: No stability like natural grass (Evaluation is x). Softness of the grass surface: Because the grass height is as long as 40 mm,
Only the softness of the grass was felt (evaluation: △). Slip on the grass surface: The resistance of the grass yarn was strongly felt (the evaluation was ×). Tee-up property: Both the insertion property and the stability of the tea are not good (the evaluation is x). [Comprehensive evaluation] A bottoming phenomenon appeared as in Comparative example 3, and all evaluations were poor. Therefore, the overall evaluation was also x.

<Comparative Example 6> [Specifications] Grass thread height H = 40 mm, filler height h = 7.
5 mm, difference (H−h) = 32.5 mm, filling amount W =
11 kg / m ² [Evaluation parameter] Stability of stance: As in Comparative Example 4, since the amount of sand was smaller than the height of grass thread, the sense of stability was not good (Evaluation: ×). Softness of turf surface: Since (Hh) was as large as 32.5 mm, the softness of the turf yarn was felt as in Comparative Example 4 (evaluation: Δ). Slip on grass surface: Although not as good as Comparative Example 3 without sand, similar to Comparative Example 4, a bottoming phenomenon still appeared (evaluation: Δ). Tee-up property: As in Comparative Example 4, the tee-in property and the stability of the tee are still poor (evaluation is x). [Comprehensive evaluation] Even if the grass thread height H is 40 mm, the filler height h is 7.5 mm, and the filling amount W is 11 kg /.
Since it was as small as m ² , as in Comparative Example 4, the phenomenon of bottoming out was still not eliminated, and the results were Δ to × overall.

In summary, the specifications and evaluations of Examples 1 to 14 and Comparative Examples 1 to 6 are shown in Table 1, and a total evaluation is added.

[0059]

[Table 1]

In Comparative Examples 1 and 2, since the lawn height H was less than 30 mm, the softness due to the pile did not appear on the artificial grass surface. In particular, each evaluation of softness and slippage was bad.
In Comparative Examples 3 and 5, since no sand was filled, a so-called bottoming phenomenon appeared, and the evaluation of softness, slippage, and stability was poor.

In Comparative Examples 4 and 6, even if sand was contained, the filling height h was 7.5 mm and the filling amount W was as small as 11 kg / m ² . The evaluation of stability was poor.

Examples 1, 4, 8, and 13 are examples in which the lawn height H is 30 mm or more and the filler height h is 10 mm. Softness and slippage were greatly improved, but stability was slightly smaller.

In Examples 1, 2, and 3, the lawn height H was 30 m.
m, and the height h of the filler was 10 mm or more. As compared with Comparative Examples 1, 3, and 4, stability and softness were greatly improved, but slippage was slightly reduced.

In Examples 3, 7, and 12, the grass height H was 30
mm, and the filler height h is the same as the grass thread height H. That is, since the sand is filled up to the artificial turf surface, the resistance of the sand is felt large, and the evaluation of the slip is slightly worse than in the other examples.

In Examples 1 to 7, 9 to 12, and 14, 0 ≦ H
-H ≦ 30 mm and W ≧ 15 kg / m ^2. According to this example, the fibrous contact feeling (softness) by the artificial turf pile and the softness by the sand layer are synergistic. It was demonstrated that good softness similar to natural grass was obtained. Regarding this point, Example 8,
Compare with 13.

In particular, Examples 6, 10 and 11 show a sense of stability,
The scores for both softness and slippage are close to full marks, and can be said to be the best examples of the present invention. Examples 2, 5, and 9
Since the amount of sand was larger than that of Examples 1, 4, and 8, the scores of stability, softness, and slip were slightly increased. Similarly, the third, sixth, and tenth embodiments correspond to the second, fifth, and ninth embodiments.
Because of the higher sand content, the stability and softness scores are increasing.

Next, the height h (m) of the filler in each of the above examples is shown.
Table 2 shows a map in which m) is plotted on the ordinate and the grass height H (mm) is plotted on the abscissa. As for the characters and symbols in this map, for example, "actual 1" means "Example 1", "ratio 1" means "Comparative Example 1", and "◎" stands for "Comprehensive Evaluation ◎". Things.

[0068]

[Table 2]

In Table 2, the portions indicated by cross hatches are h>
H, that is, a region where the filler becomes higher than the turf surface, resulting in poor appearance. It is understood that the properties close to those of natural lawn can be obtained by performing the condition where the filler height h is h ≧ 10 mm and the lawn height H is H ≧ 30 mm, that is, in the area surrounded by the thick line in the table. .

[0070]

As described above, according to the present invention,
An artificial turf in which a large number of artificial grass yarns are planted on the deformation-constraining layer using a base cloth as a deformation-constraining layer, and a filler such as sand is filled in layers in the grass. In the above, the lawn height from the upper surface of the deformation constraining layer to the tip of the artificial lawn is defined as H, and the height h of the filler layered on the deformation constraining layer is defined as H, so that the lawn height H satisfies H ≧ 30 mm. And
In addition, since the filler height h satisfies h ≧ 10 mm, the characteristics of so-called artificial turf with sand can be approximated to that of natural turf without using elasticity providing means such as an elastic mat or an elastic granule. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an artificial lawn according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Artificial turf 2 Base cloth (deformation restraint layer) 3 Backing material 4 Base layer 5 Filler (sand) G Base H Grass height h Filler height P Artificial grass

Claims (3)

[Claims] 1. A base material or the like is used as a deformation constraining layer, and a large number of artificial grass yarns are planted on the deformation constraining layer, and a filler such as sand is filled in a layer in the grass. In the artificial lawn, the height of the lawn from the upper surface of the deformation constraining layer to the tip of the artificial lawn is H, and the height of the filler layered on the deformation constraining layer is h. An artificial turf characterized in that the yarn height H satisfies H ≧ 30 mm and the filler height h satisfies h ≧ 10 mm. 2. The difference (Hh) between the grass thread height H and the filler height h is in the range of 0 mm ≦ Hh ≦ 30 mm, and the filler per square meter of the filler. The artificial grass according to claim 1, wherein the filling amount satisfies W ≧ 15 kg / m ² as Wkg. 3. The artificial turf according to claim 1, wherein at least a surface layer side of the turf surface formed by the artificial turf yarn is filled with a filler colored in green.