JP2869576B2 - Artificial grass - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf in which synthetic resin filaments are planted so as to form a large number of cut piles.

2. Description of the Related Art Artificial turf, in which a large number of piles are planted on a base cloth, has recently been laid on sports courts and grounds for tennis, baseball, soccer, rugby, and the like. Among these grounds and the like, it is desirable that outdoor ones contain a suitable amount of moisture when used. This is required to prevent temperature rise due to solar heat and to prevent burns due to frictional heat when falling. For example, for hockey grounds, according to the rules of the League of Nations, for 45 minutes during the competition,
The artificial lawn must be kept moist and at a temperature of 50 ° C or less.

In conventional artificial turf, if the base fabric is permeable, the sprayed water is immediately absorbed by the ground, and sufficient water retention is not achieved. On the other hand, if the base fabric is impermeable, the sprayed water can be retained on the base fabric, but if the amount of water sprayed is large, the artificial grass surface becomes excessively wet, making it difficult to use. If the water content is small, the water on the base fabric evaporates in a short time and the wet state cannot be maintained. Therefore, it was difficult to perform proper watering, and high attention was required.

An object of the present invention is to provide an artificial turf that solves such disadvantages of the conventional artificial turf, has sufficient water retention, and can easily obtain an appropriate wet state.

Means for Solving the Problems The object of the present invention is to provide a base cloth having a synthetic resin fiber cloth, and a water-absorbing fine fiber provided so as to substantially cover the upper surface of the base cloth in a state of being entangled with each other. This is achieved by an artificial turf characterized by comprising a ground structure provided and a pile formed by implanting a filament in the ground tissue.

The artificial turf may be provided with a sand layer on the ground tissue, and the pile has a tip protruding from the sand layer.

The fineness of a single yarn of the water-supplying fine fiber is desirably 3 to 80 denier. If the fineness of the single yarn is less than 3 denier, the single yarns that are entangled with each other cannot be given an appropriate waist, and the fine fibers cannot maintain an appropriate bulkiness. If the fineness exceeds 80 denier, the needle resistance when implanting the monofilament in the ground tissue becomes too large to make it difficult to manufacture, and the entanglement with the base fabric cannot be good, resulting in a lack of unity. From such a viewpoint, the fineness of the single yarn is 10 to 60.
Denier is more preferred.

Each of the piles has a spiral shape in section.
It can be formed by one or a plurality of flat monofilaments.

The flat monofilament has a width of 3 to 50 mm and a thickness of 0.0
It is desirable that the thickness is 2 to 0.15 mm and the aspect ratio is 150 to 2500. If this width is less than 3 mm, the diameter of the pile becomes too small to obtain sufficient water retention by the pile itself described later, and if it exceeds 50 mm, the diameter of the pile becomes too large to give an appearance like natural grass. It becomes difficult to obtain. Further, if the thickness of the monofilament is less than 0.02 mm, it becomes liable to be worn due to contact during use and lacks abrasion resistance, and if it exceeds 0.15 mm, the rigidity of the monofilament becomes too high and the cross section is twisted in a spiral shape. Difficult to manufacture. From these perspectives,
More preferably, the flat monofilament has a width of 5 mm
3030 mm, thickness 0.04 mm〜0.10 mm.

In the present specification, as the synthetic resin filaments, those conventionally used for artificial turf such as flat monofilaments and split yarns can be used in a wide range, and the materials thereof include, for example, nylon resin, polypropylene resin, polyester Resin, vinyl chloride resin,
A polyethylene resin and the like can be exemplified. Examples of the material of the base cloth include a polypropylene resin and a high-density polyethylene resin.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1a and 1b show an artificial lawn according to one embodiment of the present invention. The artificial turf (1) includes an artificial turf main body (1 ') in which a plurality of monofilaments (2) are planted so as to form a large number of piles (3) on the surface of a ground tissue (4). . The ground structure (4) is composed of a base fabric (4a) formed by the production of synthetic resin yarn, and the like.
a) Consisting of fine fibers (4b) provided so as to substantially cover the top, and a resin layer (5) for preventing the pile (3) from falling off is formed on the back surface of the ground structure (4). Have been. Examples of the water-absorbing fine fiber (4b) include: a) a fiber having a large number of pores forming a capillary action inside the fiber (for example, 1.5 denier “Aquaron” manufactured by Kanebo Co.
A fiber length of 38 mm or 51 mm with a water absorption of about 27-30%, 3 denier, a fiber length of 76 mm or 102 mm with a water absorption of about 10%) b) With a water-absorbing outer layer and an inner filament supporting it ("Lanseal-F" manufactured by Nippon Xlan Industrial Co., Ltd., 3 denier, 3 mm fiber length, 5 denier, 51 mm fiber length, water absorption about 150 ml / g) Things. In order to provide the fine fibers (4b) on the base cloth (4a), the web in which the fine fibers are entangled is placed on the base cloth (4a), and needles are pierced through a large number of places on the web to form the web. A so-called needle locking in which a part protrudes to the opposite side of the base cloth (4a) can be adopted. In addition, an appropriate means such as a method of sewing the web on the base cloth (4a) with a thread can be adopted. The monofilament (2) on the ground structure (4) thus formed is implanted to form a large number of panels (3). Monofilament (2)
The base fabric (4a) and the fine fibers (4b) are more firmly fixed based on the planting.

The artificial turf main body (1 ') thus constructed is laid on a ground (G) on which a coat or a ground is to be formed and is appropriately fixed, and further, only the tip of the pile (3) appears on the surface. Sand is placed on the ground structure (4) to provide a sand layer (6), and the sand is completed as an artificial lawn (1).

When water is sprayed on the artificial grass, the water permeates the sand layer (6) and reaches the water-absorbing fine fibers (4b) and is retained by the fibers. Therefore, even if the water evaporates from the surface of the sand layer (6), the water retained in the water-absorbing fine fibers (4b) is supplied to the sand layer to prevent or alleviate the reduction of the water content of the sand layer. For a long time. Even if the amount of water spray is excessive, excess water is retained by the water-absorbing fine fibers because the water-absorbing fine fibers (4b) have a large water retention capacity. Therefore, it is possible to prevent the surface of the artificial grass from being wet with excessive water, and it is easy to obtain an appropriate wet state, and it is easy to spray water.

If the artificial turf is made water permeable, watering becomes easier to obtain an appropriate wet state. This is because, if too much water is sprayed beyond that which can be retained by the absorbent fibers, the excess water will be absorbed into the ground through the artificial grass. Therefore, watering can be performed with almost no fear of excess water. In order to make the artificial turf water-permeable, a water-permeable woven fabric or the like may be used as the base cloth, and the water-absorbing fine fibers may be fixed to the base cloth by needle locking. As a result, the fine fibers also project on the back surface of the base fabric, and the resin layer provided on the back surface of the ground structure does not become completely dense and continuous, and water permeability through the base fabric and the resin layer is obtained.
In addition, the warp and the weft each have an interval of 1 mm or more, or
Using a coarse base cloth joined by resin coating at the entanglement point, tufting at a tuft interval of 1.5 times or more the warp interval, and backing with a small amount of resin so that voids in the base cloth remain By performing the treatment, better water permeability can be obtained. To ensure that the voids in the base fabric remain, it is sufficient to apply the backing resin to the back surface of the base fabric by roller coating with the pile facing up after tufting, which is necessary before drying or agglomeration of the resin. In accordance with the above, a treatment is performed such as blowing the resin on the gap by blowing the airflow substantially perpendicular to the base cloth, or removing the resin on the gap by a doctor having flexible projections. Furthermore, water permeability can be obtained by making holes in the base cloth with a needle or the like before or after a backing treatment.

Next, another example of the artificial grass according to the present invention will be described.

FIG. 2 shows an artificial lawn (1) in which a number of piles (3) twisted in a spiral shape in section are planted on the surface of a ground tissue (4). The ground structure (4) of the artificial turf main body (1 ') is similar to the example of FIG.
b), and a resin layer (5) is formed on the back surface by backing processing. The pile (3) is twisted as shown in FIG. This twist is a Z twist in the illustrated example, but may be an S twist. Further, the pile (3) has been subjected to a crimping treatment, so that the pile (3) is provided with flexibility to improve walking feeling and the like. As in the example of FIG. 1, the sand layer (6) is formed on the ground tissue, and the pile (3) has only the tip protruding from the surface in the artificial grass body configured as described above. Is done. In this example,
Since the pile (3) is configured to be twisted in a spiral shape in cross section, a cavity is formed inside and the water that has entered the cavity is held based on its surface tension and the like. Therefore, according to this example, in addition to the water retention effect by the water-absorbing fine fibers (4b) and the water supply effect to the sand layer, the water retention effect by the pile itself is obtained, and the artificial grass is kept wet for a longer time. Can be kept.

FIG. 4 schematically shows a monofilament manufacturing apparatus (11) used for manufacturing the monofilament. The manufacturing apparatus (11) is an apparatus for manufacturing a large number of monofilaments, and includes a downward die (12) attached to an extruder (not shown) for extruding a molten resin; ) Provided with a monofilament spinneret (13). Flat molten monofilament (2) extruded from the nozzle hole of spinneret (13)
a) is cooled by passing through a cooling water tank (14) disposed immediately below the spinneret (13), and is cooled by a first snap roll (1).
After 5), it is sent to the heating tank (16). The filament (2b) heated in the heating tank (16) is taken up by a second snap roll (17).
The above-mentioned filament is stretched, for example, to a length of about 5 times by using the snap roll (15), the heating tank (16) and the second snap roll (17). The monofilament (2c) that has passed through this stretching step passes through the heat treatment tank (18) and is taken up by the third snap roll (19). By passing the filament (2c) through the heat treatment tank (18), residual strain generated in the filament (2c) in the stretching step can be removed. Each of the flat filaments (2c) taken up by the third snap roll (19) is taken up as a raw yarn by a winder (20), and is subjected to a single twisting step of an artificial turf manufacturing device (not shown). Sent.

In the monofilament manufacturing apparatus (11), snap rolls (15), (17),
Instead of (19), a clover roll, a codet roll, or the like can be used. As shown in FIGS. 5, 6, and 7, the monofilament spinneret (13) has a nozzle hole (21) formed in a C-shape and one end (21 ') thereof.
The monofilament extruded from the nozzle hole (21) of the spinneret (13), which has a substantially linear shape, has a C-shaped cross section similar to that of the nozzle hole (21). By subjecting the monofilament thus formed to a single twist (in this embodiment, Z twist), the cross section thereof is easily formed into a spiral shape, and has an advantage that the monofilament of the present invention can be easily manufactured. Instead of the above form,
The other end (21 ″) of the C-shaped ring in the nozzle hole (21)
If the monofilament is extended substantially linearly, the monofilament formed from the nozzle hole can be easily made into a spiral shape in cross section by applying S twist to the monofilament. Examples of the apparatus for performing the single twist on the monofilament include a ring-type twisting machine, a plying machine, and a double twister. As an apparatus for fixing the twisting conditions, for example, a vacuum-type steam setter or the like may be employed. In addition to the above-described C-shaped monofilament, a single-filament ordinary cross-section linear monofilament can be twisted to form a spiral cross section. Therefore, the spinneret is extremely effective in facilitating the formation of a pile having a spiral cross section and facilitating the production of the artificial turf. The monofilament that has passed through the single twisting step is then subjected to a crimping treatment such as knit denitration, and this state is set by heating or the like and wound up again. By implanting the monofilament in the ground tissue, a large number of piles having a spiral cross section can be formed on the surface of the ground tissue. Next, a backing process is performed to prevent the pile from dropping out of the ground structure.

In addition, a plurality of cross-sectional spiral monofilaments, for example, two monofilaments that have passed through the above single twisting step,
Further, the yarn may be twisted through a double twisting step and planted in the ground structure. This makes it possible to form a pile (31) having two spiral cross sections, as shown in FIG.
In the double-twisting step, besides the above-described twisting machine, a commonly used known double-twisting twisting machine can be appropriately adopted. Similarly to the artificial grass turf pile (3), the pile (31) having such a shape has a cavity capable of retaining water therein, and further retains water between two monofilaments. Therefore, it has better water retention.

Alternatively, a plurality of monofilaments having a spiral cross section may be bundled and planted, and each pile may be constituted by a plurality of monofilaments.

FIG. 9 shows still another example of the present invention. This artificial turf (1) is of a type in which a sand layer is not formed on a ground tissue. In this example, the ground organization (4)
Is composed of a base cloth (4a) made of synthetic resin fibers and a water-absorbing fine fiber (4b). The pile (3) implanted in the ground tissue is a filament of an appropriate form such as a monofilament or a split yarn, and the cross section of the monofilament is flat, circular, polygonal, or spiral in cross section as shown in FIG. 3 or FIG. The shape is free. In addition to the loop pile as shown in the figure, it is of course possible to use a cut pile. Also in this example, since the water-absorbing fine fibers (4b) are present on the base fabric, the sprayed water is retained by the water-absorbing fine fibers (4b), and the wet state of the artificial grass is maintained for a long time. You. In addition, since excess water is absorbed by the water-absorbing fine fibers, it is easy to spray water for obtaining an appropriate wet state.

Effect of the Invention As described above, the artificial turf of the present invention uses a ground tissue provided with a base fabric and water-absorbing fine fibers that substantially cover the top surface of the base fabric in a state of being entangled with each other, and is piled in the ground tissue. When water is sprayed on the artificial grass, a large amount of water is retained by the water-absorbing fine fibers. Since the water-absorbing fine fibers constitute the ground structure together with the base fabric, they exist at the base of the pile and hardly touch the user directly. Therefore, an appropriate wet state can be obtained on the pile surface while securing a large amount of water with the water-absorbing fine fibers. This moderate wet state is maintained for a long time by supplying water from the water-absorbing fine fibers. In addition, even if the amount of water sprayed is excessive, the water-absorbing fine fibers have a large water retention capacity, so that excess water is retained by the water-absorbing fine fibers, preventing the surface of the artificial turf from becoming wet with excessive water. it can. Therefore, watering for obtaining an excessively wet state becomes easy.

In addition, when a sand layer is provided on the ground structure, the water sprinkled penetrates the sand layer, reaches the fine water-absorbing fibers and is retained in a large amount by the fibers, and even if moisture evaporates from the sand layer surface, The water retained in the water-absorbing fine fibers is sequentially supplied to the sand layer to prevent or alleviate the decrease in the water content of the sand layer, and to maintain an appropriate moist state of the artificial turf for a long time.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1a is a vertical front view of one example of artificial grass, FIG. 1b is a vertical side view of the same, and FIG. 2 is a vertical side view of another example of the artificial grass. Fig. 3 is an enlarged perspective view showing the tip of the pile, Fig. 4 is a side view schematically showing an example of an apparatus for producing a monofilament for artificial turf, and Fig. 5 is spinning of the monofilament. FIG. 6 is a plan view showing an example of the base, FIG. 6 is a sectional view taken along the line II in FIG. 5, FIG. 7 is an enlarged view showing a portion A in FIG. 5, and FIG. FIG. 9 is an enlarged perspective view showing the tip of the pile of the example, and FIG. 9 is a longitudinal side view of still another example of the artificial grass. (1) ... artificial grass (1 ') ... artificial grass body (2) ... monofilament (3), (31) ... pile (4) ... ground structure (4a) ... base cloth (4b) ... ... fine fiber (5) ... resin layer (6) ... sand layer (G) ... ground

Claims (5)

(57) [Claims] 1. A ground fabric having a base fabric having a cloth of synthetic resin fibers, a ground structure provided with water-absorbing fine fibers provided so as to substantially cover an upper surface of the base fabric in a state of being entangled with each other, and An artificial lawn comprising a pile formed by implanting a filament. 2. The artificial turf according to claim 1, wherein a sand layer is provided on the ground structure, and the pile has a tip protruding from the sand layer. 3. The artificial turf according to claim 1, wherein the fineness of the single yarn of the water-absorbing fine fiber is 3 to 80 denier. 4. The pile according to claim 1, wherein each of the piles is formed of one or more flat monofilaments having a spiral shape in cross section. Artificial grass. 5. The flat monofilament according to claim 1, wherein said flat monofilament has a width of 3 to 50.
The artificial turf according to claim 4, wherein the artificial lawn has a thickness of 0.02 to 0.15 mm and an aspect ratio of 150 to 2500.