JP2587571B2 - Artificial turf ground 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 an artificial turf ground having improved cushioning properties by spraying sand on grass.

[0002]

2. Description of the Related Art Conventionally, so-called grounds of ball and stadiums have been made of natural soil or grass, but in recent years artificial turf has been laid to make maintenance easy and to allow competitions to be held even in rainy weather. There are also many grounds that have been seen. In the case of this artificial turf ground, compared to the natural ground, it has a great effect in terms of ease of maintenance and drainage, but on the other hand, it has a disadvantage that it is easy for athletes to slip and has little cushioning, so it is easy to damage the legs Has been pointed out. Therefore, there is an attempt to protect the competitor's legs by increasing the cushioning property by spraying sand on the grass of the artificial turf (for example, Japanese Patent Publication No. 60-46203).

[0003]

However, even if sand is simply sprayed on the grass of artificial turf and laid on a stable base, a sufficient buffer effect cannot be obtained. The density needs to be quite high. In practice, they often rely on construction techniques.For example, sports fields and golf courses have been proposed in which buffer materials such as rubber are interposed between the base and artificial turf, and artificial turf containing sand is laid one on top of the other. (Eg, Japanese Patent Application Laid-Open No. 60-98003). In the case of a ground in which some kind of cushioning material is interposed between the artificial turf and the base, in order to provide cushioning properties suitable for each competition, it is only necessary to select a cushioning material according to its physical properties, but naturally a cushioning material is used. The cost increase due to the increase in material cost and construction labor is inevitable.

[0004]

SUMMARY OF THE INVENTION The present invention aims at providing an inexpensive sand-containing artificial turf ground having cushioning properties so as not to burden the athlete's legs, and comprises a crimped pile yarn made of synthetic resin. Is planted on the entire surface with short grass leaves,
An artificial turf in which long turf leaves are arranged at appropriate intervals is laid, and sand is scattered in the grass.

[0005] Here, since the short turf leaves are for imparting cushioning properties by the elasticity and cushioning action of the scattered sand and turf leaves, it is preferable to form the short turf leaves with pile yarns. Needs to be crimped. This is because the crimped pile yarn has excellent compression recovery properties, is effective for imparting cushioning properties to the artificial turf, and the direction of the grass is hard to appear, so that the sand is not easily shifted. The pile density of the turf leaves does not need to be extremely high, but a relatively high density is effective within an acceptable range in consideration of the influence on the manufacturing process and an increase in material costs. Specifically, the driving is performed at 6 stitches / inch or more in the 5/16 gauge or less.

Long turf leaves provide a direct feel and serve as artificial turf in appearance, and are arranged at appropriate intervals in short turf leaves. If the interval is too wide, the appearance of the artificial turf ground becomes poor, so that an interval of about 10 to 20 mm is usually preferable.

[0007] Since turf leaves are used for the above-mentioned purposes, turf leaves whose length is short are 3 mm or more,
More preferably, the difference between the short turf leaf and the long turf leaf is about 5 mm to 15 mm. In other words, if the length of the turf leaf is less than about 3 mm, it is difficult to exhibit cushioning properties. If the difference in the length of the turf leaf is too small, the scattered sand tends to be unevenly distributed. If it is too much, the amount of sand to be sprayed becomes large, so that not only the construction labor is increased, but also the artificial turf ground surface is slippery and the feel is not good.

The pile yarn forming the turf leaves is, for example, a flat yarn using a thermoplastic synthetic resin such as polyamide, polyester, polyvinylidene chloride or polypropylene, a split yarn obtained by splitting the flat yarn, or a monofilament. Can be used, and is appropriately selected depending on physical properties such as abrasion resistance, weather resistance, and rigidity required as a pile yarn.

[0009]

According to the present invention, by arranging long turf leaves at appropriate intervals in short turf leaves, the short turf leaves have a cushioning property and the long turf leaves have an appearance as an artificial turf ground. . The use of crimped pile yarns provides excellent compression recovery and gives cushioning to artificial turf. In addition, since it is difficult to show the direction of the grass, it is difficult for the sand to shift.

When the short turf leaf is about 3 mm or more, cushioning properties are exhibited, and when the difference in length between the short turf leaf and the long turf leaf is about 5 mm to 15 mm, spraying is performed. The amount of sand produced was also appropriate, the uneven distribution of the scattered sand was prevented, the slipperiness of the artificial turf ground surface was eliminated, and the feel was good.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a partial cross section of an artificial turf ground with sand of the present invention.
Here, reference numeral 1 denotes the artificial turf of the present invention. The artificial turf 1 is composed of a short turf leaf 2, a long turf leaf 3, a base cloth 4, and a backing material 5 of the base cloth. Is sprayed to the vicinity of the upper part of the long lawn leaf 3.

Example 1 Nylon was selected as a synthetic resin, and the extrusion temperature was 250 ° C., the stretching temperature was 180 ° C., the annealing temperature was 185 ° C., and the stretching ratio was 4.5 times.
00 denier and 200 denier flat yarns were produced. The 600 denier flat yarn is bundled as it is and twisted twice / inch to be used as a pile yarn for a long lawn leaf 3. The 200 denier flat yarn is bundled and twisted 10 times.
After rounding / inch, it was crimped to 15 piles / inch by a compression shaping crimping machine and used as a pile of short grass leaf 2.

A nonwoven polyester fabric having a basis weight of 120 g / m ² was selected for the base fabric 4, and pile yarn was tufted at a 5/32 gauge at 10 stitches / inch. In this case, one long turf leaf is tufted at regular intervals (about 18 mm) for four short turf leaves, and long turf leaves are arranged vertically, and the pile length of the long turf leaf 3 is 18 mm and the short turf leaf 2 Was 10 mm in pile length.

The artificial turf, which is made by sticking the backing material 5 of the base cloth to the back surface, is laid on a concrete base, sprinkled with natural silica sand, and brushed to make a long turf leaf when the surface is smoothed. Has created an artificial turf with sand that can be checked about 3 mm on the surface.

Comparative Example 1-1 A 200 denier nylon flat yarn used for short grass leaves in Example 1 was used as a pile yarn without crimping, and all other conditions and methods were the same as those in Example 1. An artificial turf containing sand manufactured in the same manner as in No. 1 was produced.

Comparative Example 1-2 A 600-denier nylon flat yarn used for long turf leaves in Example 1 was used as a pile yarn and tufted to a length of 18 mm over the entire surface without discrimination between long and short turf leaves. An artificial turf containing sand was manufactured in the same manner as in Example 1 except for the other conditions and methods.

Example 2 Polypropylene was selected as the synthetic resin and the extrusion temperature was 260
C., a drawing temperature of 160.degree. C., an annealing temperature of 170.degree. C., and a draw ratio of 4.times. To produce a 300-denier flat monofilament. 14 flat monofilaments were bundled, twisted twice / inch, and further crimped at 18 ridges / inch by a compression shaping type crimping machine, and used as long and short grass leaf pile yarns.

A polyester nonwoven fabric having a basis weight of 120 g / m ² was selected for the base fabric, and a pile yarn was tufted at 5/32 gauge and 8 stitches / inch. At this time, one long turf leaf is tufted at regular intervals (approximately 11 mm) for three short turf leaves, and the long turf leaves are arranged vertically, the pile length of the long turf leaves is 12 mm, and the pile of the short turf leaves is piled. The length was 7 mm. Furthermore, the artificial turf made by pasting the base material on the back side is laid on the concrete base,
An artificial turf containing sand was created in which natural silica sand was sprayed and brushed to make the surface smooth, and long grass leaves could be confirmed about 3 mm on the surface.

Comparative Example 2-1 Polypropylene flat monofilament used for turf leaves in Example 2 was used for the pile yarn, and the length of the long turf leaves was 12 m.
m, the pile length of the short turf leaves was 2 mm, and an artificial turf containing sand was produced in the same manner as in Example 2 except for the other conditions and methods.

Comparative Example 2-2 The polypropylene flat monofilament used for the turf in Example 2 was used for the pile yarn, and the length of the long turf was 22 m.
m, the pile length of the short turf leaves was 5 mm, and the sand-containing artificial turf manufactured in the same manner as in Example 2 in all other conditions and methods was prepared.

Table 1 shows the cushioning properties of the artificial turf containing sand of Examples and Comparative Examples immediately after construction and three months later, and the results of the appearance of the sand due to uneven distribution of sand.

The artificial turf with sand of Example 1 was compared with Comparative Example 1-1.
This is a structural difference in whether or not a crimped pile yarn is used for a short turf leaf as compared with the sand-containing artificial turf. The sand-containing artificial turf of Comparative Example 1-2 is a normal sand-containing artificial turf. . Immediately after the construction, the cushioning property and appearance were usable for both the example and the comparative example, but three months after the construction, the state of the artificial turf of the comparative example changed significantly. That is, in Comparative Example 1-2, the scattered sand was concentrated near the bottom and had no cushioning property, and uneven distribution of the sand appeared in the appearance. Comparative Example 1-1 is Comparative Example 1-2.
Although not so small, sand enters the inside of the short turf leaves and impairs the elasticity of the pile yarn.

[0023]

[Table 1]

The artificial turf with sand of Example 1 is cushioned even after three months of construction because sand is hard to move inside due to the bent shape and compression recovery of the crimped pile yarn used for short turf leaves. The property was present, and there was no problem in appearance.

The same effect was observed in Example 2 in which a flat monofilament was used as the pile yarn. Example 2, Comparative Example 2-1 and Comparative Example 2-2 verify the effect of the pile length of long and short turf leaves on cushioning properties and appearance. Here, Comparative Example 2-
No. 1 does not exhibit sufficient cushioning properties because the pile length of the short turf leaves is short at 2 mm, and Comparative Example 2-2 requires a large amount of sand to be scattered because the difference in pile length between the long and short turf leaves is as large as 17 mm. The uneven distribution of the sand was remarkably exhibited, and a portion having a different cushioning property was partially generated, which was not preferable in appearance. That is, in the present invention, the length of the pile forming the turf leaf is 3 mm or more for the short turf leaf, and the difference between the short turf leaf and the long turf leaf is about 5 to 15 mm. .

[0026]

According to the present invention, an artificial turf ground in which long turf leaves are arranged vertically on a short turf leaf planted on the entire surface is laid and sand is scattered, so that the artificial turf ground containing sand is short. Due to the compressive recovery of the turf leaves and the elasticity and cushioning action of the sand sprayed on the upper part and inside of the grass, it has a cushioning property.

In order to impart this cushioning property to the artificial turf itself, it was necessary to make the pile density extremely high. However, according to the present invention, it is possible to easily manufacture the artificial turf at low cost without any special process or technique. it can. Further, since it is not necessary to use a cushioning material or the like as a part or a member, the construction labor does not increase. The use of crimped yarn for grass leaves prevents the sand from moving into the interior due to the complicatedly bent shape of the grass leaves, maintains compression recovery, and has the effect of suppressing uneven distribution of sand. It became something that could be done.

The artificial turf containing sand having the structure of the present invention can be used, for example, in a baseball field, a soccer field, a golf course, a tennis court, a walking route, etc. by selecting the material and shape of the turf leaf and the density of the flocking. Is also applicable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an artificial turf ground with sand of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Artificial turf 2 Short turf leaf 3 Long turf leaf 4 Base cloth 5 Backing material of base cloth 6 Base 7 Sand

Claims (1)

(57) [Claims] [Claim 1] While synthetic resin crimped pile yarn is planted on the entire surface with short turf leaves, long turf leaves are arranged at intervals of 10 to 20 mm , and short turf leaves are 3 mm or more and short turf leaves. And long grass leaves
An artificial turf ground with sand, characterized by laying artificial grass with a difference of 5mm to 15mm and spraying sand in the grass.