JPH076164B2 - Artificial grass structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to an artificial turf structure that can be used, for example, on a tee ground of a golf course, a park, a sidewalk, or a playground.

(Prior art and problems to be solved) Conventionally, as artificial grass, a carpet-like thing in which a fiber loop is projected on the surface of a braided fabric by a tuft machine, and the back side is lined with rubber or the like, as it is, or the loop thereof. An artificial turf is known in which sand is sprinkled on the cut end of the turf.

However, in such a conventional artificial turf, it is difficult to increase the height of the fiber loop due to the nature of the machine, the limit is 4 cm at most, and since the thickness of the fabric portion and the lining portion is small, The artificial turf had a poor natural feel, and when it was used as an artificial turf for a golf course, it had a low strength such as being easily scraped off when hitting a club, and also had poor durability. In addition, the scattered sand is easily scattered by wind and rain, which causes a problem that artificial grass with a poor sense of nature is obtained.

On the other hand, recently, a plastic frame was set in a grid pattern, and a seedling-shaped artificial grass member was fitted and fixed in the grid,
A method of forming artificial grass by spraying sand on it is known.

However, since it is a plastic frame, it has a problem in that it has poor natural feeling and durability, and that the manufacturing cost is high.

In view of the above problems of conventional artificial turf, the present inventors have arranged a thermoplastic synthetic resin in order to provide an artificial turf that is excellent in natural feeling, strength and durability and is inexpensive and easy. A patent application was filed for an artificial turf structure in which the root of a turf-like member having a plurality of rows of resin-made strip members is fixed with a clay-sand bond (Japanese Patent Application No. 63-19853).
No. 1 (JP-A No. 2-47405).

However, although the above-mentioned invention can obtain an excellent effect as compared with the conventional artificial turf structure, the strip member standing upright due to long-term use may be trampled, so that the strip member collapses in the lateral direction or a bundle of strip members. However, there is a problem in that the turf tends to become hard and the artificial grass structure loses its natural feel. Further, since the bundle of strip members becomes hard, there is a problem that the tee does not easily stick when used as a tea ground.

Therefore, it is an object of the present invention to provide an artificial turf structure that can retain a natural feeling and flexibility when used for a longer period of time than conventional artificial turf structures.

(Means for Solving the Problems) As a result of intensive studies to achieve the above object, the present inventors have found that the above object can be achieved by configuring the artificial turf structure as follows. It has come to.

That is, the present invention is a bundle of leaf members made of a plurality of arranged thermoplastic resin,
A plurality of turf members composed of a net member surrounding the leaf member bundle so as to tightly fix the leaf members are arranged, and a tie layer formed of a mixture of earth and sand and a polymer latex is used to form the turf member. While fixing the turf members to each other so as to cover at least the root portion, the mesh member,
The present invention relates to an artificial turf structure characterized by being composed of synthetic resin fibers fused at intersections.

(Example) Hereinafter, the Example of this invention is described, referring drawings.

FIG. 1 shows one mode of a turf member used in the artificial turf structure of the present invention. In the turf member 1, as an example, a bundle 4 of nine leaf members 2 is grouped together so as to have a rectangular cross section as a whole. As shown in FIG. 2, each bundle 4 is composed of a plurality of leaf members 2 made of thermoplastic synthetic resin which are sequentially arranged in the vertical direction and cut into strips, and the outer periphery of the bundle 4 is A mesh member 3 as shown in FIG. 3 is provided to tightly fix and enclose the leaf members 2 constituting the bundle 4. The mesh member 3 as shown in FIG. 3 is already known, and for example, polypropylene, polyvinylidene chloride, synthetic resin such as nylon can be extruded and stretched (stretch ratio: 5 to 7).
Double), and in the process, a fiber portion 3a and its fused intersection 3b are formed.

FIG. 4 shows a partial cross-sectional perspective view of an artificial turf structure 9 formed using the turf member 1. In this artificial grass structure 9, first, the grass member 1 shown in FIG. 1 is arranged at a predetermined interval by using a frame member (not shown) and fixed, and then the whole is turned over to turn the grass member. It is formed by placing the root portion of No. 1 on the top and pouring a clay-sand-sand binder comprising the sand and the polymer latex from above and drying it to form the bonding layer 5. It should be noted that the artificial grass structure 9 thus formed is finally sprayed with sand from above to form an artificial grass structure having a natural feel.

As earth and sand, various earth and sand are used, for example, sea sand,
Examples include mountain sand, river sand, and crushed sand. Which sand is to be used is determined from the viewpoint of the purpose of use and landscape, but for example, in a tee ground of a golf course, river sand or mountain sand that can give a gray color is usually used.

The size of the particles of earth and sand is not particularly limited and is generally adopted within the range of 0.3 to 1.2 mm. Generally, the smaller the particle size, the narrower the particle gap, the smaller the amount of rubber entering, and the higher the hardness of the soil bonding layer. On the other hand, when the particle size is large, the amount of rubber entering between the particles is large, and a rubber having a large elasticity can be obtained.

As the polymer latex, a natural rubber, a synthetic rubber or a derivative thereof is generally used. For example, there are pre-vulcanized or post-vulcanized natural rubber (sulfur-based, organic peroxide-based etc.), natural rubber graft-polymerized with methyl methacrylate, depolymerized natural rubber, and synthetic rubber-based styrene-butadiene rubber ( SBR), carboxylated styrene-butadiene rubber (X-SBR), chloroprene (CR), acrylonitrile-butadiene rubber (NBR). Further, an elastic allyl polymer, polyurethane rubber or the like can also be used. From an economical point of view, natural rubber type rubber is preferable. Further, these polymers may be used in combination.

The concentration of the polymer latex is generally used in the range of 5 to 70% by weight. When the concentration is less than 5% by weight, the handling becomes easy, but the strength of the sediment-bonded body becomes small, which is not preferable. On the other hand, when the concentration is more than 70% by weight, when mixed with earth and sand, a film is immediately formed and it becomes difficult to handle.

The ratio of polymer solid content (polymer content) to the mixture of polymer latex and earth and sand can be variously changed, but in order to obtain a bonding layer having rubber-like elasticity, the polymer content is generally 45 to 60% by weight. It is preferably used in the range. The elasticity increases as the polymer content increases, but the water permeability decreases. On the other hand, the smaller the polymer content, the elasticity decreases, but the water permeability increases.

It should be noted that it is preferable to further mix rubber crushed particles with the sediment cinder. This keeps the tie layer flexible even during long term use.

FIG. 5 shows a leaf member 12 used in the turf-like member 1 of FIG.
Another embodiment of a bundle 14 of is shown. In this embodiment, a flat yarn is used as the leaf member, and a grass-like member having various strengths can be formed by selecting the type of the flat yarn.

FIG. 6 shows a bundle 24 of leaf members 22 according to yet another embodiment. In this embodiment, a composite fiber obtained by twisting two kinds of fibers is used as the leaf member.

FIG. 7 shows another mesh member 13 of the mesh member 3 used in FIG. In this embodiment, the reticulated member is manufactured in the same manner as the reticulated member 3 shown in FIG. 3 except that it is not stretched. In this case, the intersections of the fibers are fused. It does, but it is not beaded.

FIG. 8 shows another embodiment of the grass member 21 having a circular cross section. In this aspect, a bundle 21b of leaf members is further provided outside the bundle 21a of leaf members. Since the leaf members are doubly held by the mesh members 23a and 23b in this manner, the grass member 21 is stable and very convenient for manufacturing the artificial grass structure.

FIG. 9 shows another aspect of the turf member 31. In this embodiment, the outer periphery of the bundle of leaf members 32 is surrounded by the mesh member 33 so that the bundle of leaf members 32 becomes a triangular pyramid as a whole, and the thread 36 is firmly tightened at the root portion A of the bundle. The leaf member 32 is fixedly held.

FIG. 10 shows a partial cross-sectional perspective view of an artificial grass structure 39 of the present invention manufactured by using a plurality of grass members 31 shown in FIG. In this mode, the turf member 32 is fixed by a predetermined frame (not shown), and in this state, the whole is turned over, the root A is turned up, and the earth and sand binder 35 is poured from above and dried. It is manufactured by

FIG. 11 shows another aspect of the grass member 41. In this embodiment, a bundle of a plurality of leaf members 42 arranged in the vertical direction in the figure is surrounded by a sheet-like mesh member 43 so as to open at one end of the leaf member 42, and a root portion A is provided at the bottom of the figure. Are fastened with a thread 46 so as to form
The turf member 41 of this aspect can be manufactured by wrapping a bundle of leaf members 42 in a cylindrical mesh member 43 and cutting the mesh member 43 on one side thereof.

FIG. 12 shows a partial cross-sectional perspective view of an artificial grass structure 49 of the present invention manufactured using the grass member 43 shown in FIG. This artificial turf structure 49 has a plurality of turf members 41, which are arranged at predetermined intervals by spacers (not shown), in the same manner as in the method of manufacturing the artificial turf structures 9 and 39 in FIG. 4 or FIG. It is manufactured by fixing it so that it is inside out, turning it over in that state, injecting a clay-sand mixture from above, and drying.

FIG. 13 shows another aspect of the turf member 51. In this aspect, the cross-section is elliptical and the outer periphery is a mesh member.
A plurality of bundles 54 of leaf members 52 tightly surrounded by 53 are arranged in the lateral direction, and the lower end of the bundle 54 is covered with a sheet 58 of cloth or the like so that the root portion A is formed at one end of the bundle 54. It is formed by fixing through.

(Effect of the invention) In the turf member used for the artificial turf structure of the present invention,
Multiple leaf members are tightly fixed on the outside by a mesh member composed of synthetic resin fibers fused at the intersections, so even if the turf member is pressed from above and the leaf members are crushed, the pressure is released. Then, the original state is restored due to the rigidity and the restoring force derived from the structure of the mesh member. Therefore, in the artificial turf structure of the present invention using this turf member, even if the leaf member is repeatedly treaded, it does not become hard in a fallen state and is stably held in an upright state for a long period of time. . Therefore, the artificial turf structure of the present invention can easily pierce the tee on the turf member and maintain a natural feeling for a long period of time.

[Brief description of drawings]

1 is a perspective view of a turf member used in the artificial turf structure of the present invention, and FIG. 2 is a perspective view of a bundle of leaf members used in the turf member of FIG. FIG. 3 is a perspective view of a mesh member used for the turf member of FIG. 1, and FIG. 4 is a partial cross-sectional perspective view of an artificial turf structure manufactured using the turf member shown in FIG. FIG. 5 and FIG. 6 are perspective views showing a structure of a bundle of leaf members different from the bundle of leaf members shown in FIG. 2, and FIG. FIG. 8 is a plan view showing a structure of a net-like member different from the net-like member shown in FIG. 8, and FIGS. 8 and 9 are perspective views of the grass-like member different from the grass-like member shown in FIG. 1. Yes, FIG. 10 is a cross-sectional perspective view of an artificial turf structure manufactured using the turf member shown in FIG. 9, and FIG. 11 is a plan view of the turf member of a different mode from FIG. Figure 12 is the 12th Is a partial cross-sectional perspective view of the artificial turf structure manufactured using the turf member 11 Figure, Figure 13 shows a plan view of a turf member of another embodiment and the eleventh FIG. 1, 21, 31 ...... turf member 2, 12, 22, 32, 42, 52 ...... leaf member 3, 13, 2333, 43, 53 ...... mesh member 4, 14, 24, 54 ...... bundle of leaf members 5, 35, 45 ... Coupling layer

Claims (6)

[Claims] 1. A plurality of turf members comprising a bundle of leaf members made of a plurality of arranged thermoplastic resins and a net member surrounding the leaf members so as to tightly fix the leaf members outside the bundle of leaf members. By arranging and binding the turf members to each other so as to cover at least the root of the turf member by a bonding layer formed from a mixture of earth and sand and a polymer latex, the mesh member is a fusion-bonded synthetic material. An artificial turf structure characterized by being made of a resin fiber. 2. The artificial turf structure according to claim 1, wherein the leaf member is a flat yarn. 3. The artificial turf structure according to claim 1, wherein the leaf member is a twisted yarn composed of a plurality of yarns. 4. The artificial turf structure according to claim 1, comprising a plurality of the bundles of leaf members. 5. The artificial turf structure according to claim 1, wherein the leaf member has a rectangular or circular cross section. 6. The bundle of leaf members is linearly arranged in plural and fixed at the lower end of the bundle with a thread.
The artificial turf structure described.