JPH093812A - Artificial turf ground - Google Patents

Abstract

PURPOSE: To make it possible to prevent the generation of a hardening phenomenon of an artificial turf ground attributable to frost generated in fall and winter by laminating a non-breathable foam resin sheet and a non-breathable resin sheet whose density is greater than that on a bed rock and laminating artificial turves thereon. CONSTITUTION: A non-breathable foam resin sheet 5 is expanded on a soil bed rock whose front surface is rolled with a roller where a non-breathable resin sheet 4 is expansively stretched on the layer, thereby coating the whole soil bed rock, 7. Artificial turves 1 having a backing layer, on which a pile 2 is tufted on a textile base 3, are further laminated thereon. This construction makes it possible to hold a geothermal energy for effective application and seal the moisture contained in the soil without pulling out the moisture to the ground surface and prevent the generation of frost and freezing as well.

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 excellent anti-freezing properties which eliminates the hardening phenomenon of ground caused by frost in autumn and winter and the hardening phenomenon of sand in sand-filled ground.

[0002]

2. Description of the Related Art Heretofore, artificial turf grounds have become useless because they harden due to frost in the fall and winter, and cannot be played until after the frost is thawed, for example, in the afternoon.

[0003]

SUMMARY OF THE INVENTION In view of the problems of the conventional artificial turf, the present invention does not frost the ground even in autumn and winter, the turf does not harden, and the sand in the sand-filled ground does not harden. It aims to provide an artificial turf ground with excellent anti-freezing properties that can be played all the time throughout the four seasons.

[0004]

The present invention adopts the following constitution in order to solve such a problem.

That is, the artificial turf gland of the present invention has a non-breathable foam resin sheet and a non-breathable resin sheet having a density higher than that of the foam resin sheet laminated on a substrate,
It is characterized in that artificial turf is laminated on it.

[0006]

According to the present invention, the artificial turf ground, which has been laid in a corner, often causes the ground to harden due to frost and cannot be played in cold regions or autumn and winter. It was stupid, and even the tournament operation would not be left, and we have earnestly studied to solve the problem of frosting as soon as possible.

[0007] The present inventors first of all do not draw moisture itself including moisture and steam generated from the soil base into the ground, and further do not lower the atmospheric temperature of the artificial grass on the soil below the dew point, That is, focusing on the point of breaking the root of frost formation, by stacking two types of non-breathable sheets on the soil surface, it is possible to retain and effectively utilize geothermal heat, and the water content in the soil. It has been clarified that frost can be contained without being pulled out to the ground surface, and frost and frost can be reliably prevented.

The artificial turf ground of the present invention is one in which two types of sheets, a non-breathable resin foam sheet and a non-breathable resin sheet, are spread and covered on a soil base, and then artificial turf is laid. . Prior to the laying construction, the soil base is subjected to smoothing and flattening treatment such as roller scouring so that the surface is leveled and hardened. The base in the present invention is mainly a soil base, but also a base made of concrete or asphalt concrete has a drawback that the surface temperature thereof is likely to be remarkably lowered, so that problems such as frosting and freezing still occur. The artificial turf ground of the present invention is extremely effectively used even in such a base.

The non-breathable resin foam sheet and the non-breathable resin sheet referred to in the present invention can be made of synthetic resin, for example, thermoplastic resin, thermosetting resin, synthetic rubber resin, etc. For the foam sheet, a synthetic rubber resin or an olefin resin is exclusively used, and for the latter resin sheet (non-foam), at least one selected from a thermoplastic resin or a synthetic rubber resin is exclusively used. It

Such a non-breathable resin foam sheet is one that satisfies the geothermal heat retention property, cushioning property and toughness, especially a foam having a closed cell structure, and of course a non-breathable one is used. That is, the density is preferably 0.
It is a non-breathable foam resin sheet in the range of 02 to 0.2, more preferably 0.06 to 0.1. The foaming ratio of such a foam is preferably 2 to 40 times, more preferably 10 to 15 times. It should be noted that a foam having an open cell structure or one having the entire sheet (front and back surfaces, and even both sides) covered with a synthetic resin film to form a closed structure can be used as the foam sheet of the present invention.

The other non-breathable resin sheet used in the present invention has a density higher than that of the foam resin sheet, and is particularly preferably one having excellent non-breathability and strength. Preferably has a density of 0.9 to 1.7.
The thermoplastic resin sheet in the range of is used. As the flexible thermoplastic resin, one selected from an olefin resin, a vinyl resin and a copolymer thereof is preferably used. The olefin resin referred to here is not particularly limited as long as it is a resin having an olefin as a basic skeleton, and examples thereof include a resin made of ethylene, propylene, butylene, and a vinyl monomer, and the like. A copolymer, a mixture or the like can be used. Among such olefin resins, an ethylene-vinyl acetate copolymer is particularly preferably used because it has performances such as flexibility, fit, toughness and gas barrier property.

When the non-breathable resin foam sheet and the non-breathable resin sheet of the present invention are laminated in combination, the moisture and moisture including steam from the soil base itself are blocked and cannot be drawn into the ground. Important above.
That is, these two types of sheets may be combined in any desired manner and laminated, for example, a plurality of these two types of sheets
It may be sandwiched or alternately laminated. In short, it is only necessary to block the moisture itself, including moisture and steam. With such a sheet, the softness, cushioning property, impact resilience and the like required for the ground can be adjusted conveniently. However, from the viewpoint of retaining geothermal heat, it is preferable to place a non-breathable resin foam sheet on the base side. What is necessary is just to form the artificial turf ground which matches a required characteristic.

By the way, the term "laminate" as used in the present invention means that it can be placed on a floor, adhesive, adhesive tape, fusion bonding, etc. as long as it is a form that can block or contain moisture itself including moisture and steam. Any means may be used. Of course, the non-breathable foam resin sheet or the non-breathable resin sheet, in order to achieve the above-mentioned function,
It is preferable that they are joined in the plane direction by at least one means selected from an adhesive, an adhesive tape and fusion.

The substrate of the present invention preferably has a drainage groove in at least a part of its periphery so as to achieve the above-mentioned function. Further, it is preferable to use such a drainage groove that is inclined in at least one direction to improve drainage. Further, in order to more clearly achieve the anti-freezing function of the artificial turf ground of the present invention, the non-breathing property is provided by covering the base not only on the ground surface but also on its slope. It is covered with at least one of the foam resin sheet and the non-breathable resin sheet. By doing so, it is possible to prevent intrusion of moisture including moisture and steam from the side surface of the base.

The artificial turf referred to in the present invention is mainly made of ordinary base fabric (woven fabric) tufted with piles.
Artificial grass made by knitting with double Russell or molded artificial grass is used. The napped portion mainly has a cut pile shape, but various napped shapes such as a loop shape or a mixture thereof can be used.

Such piles are mainly made of nylon (polyamide type resin) or polyolefin type resin, but among these piles, nylon yarns (film split yarns, monofilaments) are used for the ground and have a heat history. As far as the shrinkage rate of boiling water is low, it is preferably 8% or more, and more preferably 9%.
% Or more, particularly preferably 10% or more, which has a high shrinkage, and has a pile property that is soft, and, in the case of artificial sand containing sand, a function of controlling the hardening phenomenon of sand. It is good because it exerts the above effect and prevents the ground from hardening. Such an effect is also exhibited by using a pile having a crimp of about the degree or more,
Of course, it is preferable to adopt a configuration in which these can exert a synergistic effect.

The artificial grass may have a backing layer on the back surface of the base cloth, or may further have an underpad layer or a cushion layer. In particular, the underpad layer and cushion layer are indispensable for a soft and elastic player-friendly ground construction.
It is preferable to determine the extent of these layers to be attached in relation to the above-mentioned non-breathable foam resin sheet.

The artificial turf ground of the present invention can be used as various sports grounds for baseball, volleyball, badminton, dodgeball, gateball, soccer, tennis and the like. In such a sports ground, each sport requires a ground or court with a specific line drawn, and the artificial grass with such a line can be incorporated in the artificial grass unit structure of the present invention.

The present invention will be further described with reference to the drawings. FIG. 1 is a sectional view showing an example of the artificial turf gland of the present invention. In this example, on the soil base 4 whose surface has been roller-rolled,
The non-breathable foam resin sheet 5 is spread, and the non-breathable resin sheet 6 is spread and laminated on the non-breathable foam resin sheet 5 to cover the entire soil base, and the pile 2 is tufted on the base cloth 3 thereon. Further, the artificial grass 1 having the backing layer 7 is laminated.

Here, a vinyl chloride resin was coated as the backing layer 7 so as to prevent the pile from coming off and form stability.

[0021]

EXAMPLES The present invention will be further described below with reference to examples.

Example 1 Nylon 66 monofilament (450d), and
A crimped pile is used, and a polyester fiber plain fabric as a base fabric (weight per unit area 350 g / m ² : 27 vertical /
In, 25 horizontals / in) were used to tuft the pile to obtain an artificial lawn machine.

After the vinyl chloride resin (solvent solution) was pre-coated on the back surface of this greige machine and dried, a vinyl chloride resin solvent solution was further knife-coated thereon and dried to obtain 600 g / m ² and a thickness of 2 mm. A backing layer was formed to manufacture artificial grass.

On the other hand, around the soil foundation, a depth of 70 cm,
A drainage groove having a width of 40 cm was dug around, and the surface of the base was roller-rolled to be smooth and flat to form a gland. On this ground, a 3 mm thick polyethylene foam sheet (closed cells, expansion ratio = 10 times; density =
0. . 095) and smooth it again with a light roller.
Flattened. Next, on this foam sheet, a thickness of 2 m
m soft vinyl chloride sheet (density = 1.525) was spread. As shown in FIG. 1, this sheet was partially adhered via a urethane-based adhesive so as to cover not only the entire surface of the base but also the sloped surface. A commercially available adhesive tape was used for joining the vinyl chloride sheets in the planar direction.

Finally, the artificial grass was partially adhered via a urethane adhesive, and then sand was sprinkled and filled on the surface of the grass to manufacture a sand-containing artificial grass ground.

Example 2 In Example 1, after forming the gland, first, the thickness was 2 mm.
An artificial turf gland was manufactured by expanding and coating the soft vinyl chloride sheet of No. 1 and laminating and covering in the same manner except that sand was not filled. That is, the structure of the entire covering of the substrate is
It is a four-layer structure of PVC sheet / foamed sheet / PVC sheet / artificial grass.

Example 3 An artificial turf gland was manufactured in the same manner as in Example 1 except that the soil base was changed to asphalt concrete and that sand was not filled. With respect to the artificial turf grounds of these examples, the frost heaving state was observed at the time when frost was likely to occur in late autumn.
As a comparative example, the water-permeable artificial turf ground in Example 1 was laid.

As a result, the frost heave phenomenon was successfully eliminated in the grounds of Examples 1 and 2. In the ground of Example 3, a slight frost heave phenomenon was observed at the tip of the grass. In the comparative example, the frost heave phenomenon was observed on the entire turf, which was dangerous.

[0029]

According to the present invention, the grass of the ground does not harden even in the autumn and winter, and the sand of the ground containing sand does not harden, so that there is an advantage that the player can always play through the four seasons of spring, summer, autumn and winter.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of an artificial grass gland of the present invention.

[Explanation of symbols]

 1: Artificial grass 2: Pile 3: Base cloth 4: Non-breathable foam resin sheet 5: Non-breathable resin sheet 6: Drainage groove 7: Base

Claims (18)

[Claims] 1. A non-breathable foam resin sheet and a non-breathable resin sheet having a higher density than the foam resin sheet are laminated on a base, and artificial grass is laminated on the non-breathable resin sheet. Artificial grass ground. 2. The non-breathable foam resin sheet has a density of
The artificial turf ground according to claim 1, which is in the range of 0.02 to 0.2. 3. The non-breathable resin sheet comprises 0.9-1.
The artificial turf ground according to claim 1, which has a density in the range of 7. 4. The artificial grass ground according to claim 1, wherein the base is a soil base. 5. The artificial turf gland according to claim 1, wherein the resin constituting the non-breathable foam resin sheet and the non-breathable resin sheet is a synthetic resin. 6. The artificial turf gland according to claim 3, wherein the synthetic resin is a thermoplastic resin or a synthetic rubber resin. 7. The artificial grass ground according to claim 1, wherein the non-breathable foam resin sheet is a foam of a synthetic rubber resin or an olefin resin. 8. The artificial grass ground according to claim 1, wherein the non-breathable resin sheet is at least one selected from a thermoplastic resin and a synthetic rubber resin. 9. The thermoplastic resin is a vinyl chloride resin,
The artificial turf ground according to claim 5 or 7, which is at least one selected from a polyolefin resin and a copolymer thereof. 10. The artificial turf gland according to claim 1, wherein the lamination is performed by at least one means selected from a floor laying, an adhesive, an adhesive tape, and a fusion. 11. The non-breathable foam resin sheet or the non-breathable resin sheet is joined in the plane direction by at least one means selected from an adhesive, an adhesive tape and fusion. The artificial turf ground according to item 1. 12. The artificial turf gland according to claim 1, wherein the base has a drainage groove in at least a part of its periphery. 13. The artificial grass gland according to claim 12, wherein the drain groove is inclined in at least one direction. 14. The artificial turf gland according to claim 12, wherein the base is covered with at least one of the non-breathable foam resin sheet and the non-breathable resin sheet. 15. The artificial turf ground according to claim 1, wherein the base is smoothed. 16. The artificial turf gland according to claim 15, wherein the smoothing treatment is roller polishing. 17. The artificial grass ground according to claim 1, wherein the artificial grass is sand-containing artificial grass. 18. The artificial turf ground according to claim 1, which is for baseball, volleyball, badminton, gateball, soccer or tennis.