JPH076165B2 - 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 invention according to the above application provides an excellent effect as compared with the conventional artificial turf structure, the leaf portion of the upright strip member is trampled by using it for a long period of time, so that There were problems such as falling in the direction and stiffening of leaf bundles, and loss of the natural feeling of the artificial grass structure.

Therefore, it is an object of the present invention to provide an artificial grass structure that can retain a natural feel and flexibility even when used for a long period of time as compared with a conventional artificial grass structure.

(Means for Solving the Problems) The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, bundled or wound a sheet-like mesh member made of synthetic resin fibers fused at intersections. A plurality of turf members each comprising a holding means for holding the mesh member in a bundled or wound state are arranged, and at least the root of the turf member is covered with a bonding layer formed from a mixture of earth and sand and polymer latex. The present invention has been completed by finding that the above object can be easily achieved by constructing the turf members so as to be fixed to each other.

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

FIG. 1 shows a turf member assembly used in the artificial turf structure of the present invention. In FIG. 1, the grass member 1 is
Each of the sheet-like members 2 shown in FIG. 2 is composed of a bundle 4 which is formed by folding and stacking the mesh members 2 which are fused at their intersections. Each of the bundles 4 having a circular cross section forms the respective turf members 1 by weaving the threads 3 in the root portion A and the upper portion thereof, and the plurality of turf grasses fixed to each other in a blind shape. The member 1 constitutes a turf member assembly. This mesh member 2 is already known, and for example, a synthetic resin such as polypropylene, polyvinylidene chloride, or nylon is extruded and stretched (stretch ratio: 5 to 7).
Double), and in the process, the fiber portion 2a and the bead-shaped fused step 2b are formed.

FIG. 3 shows a partial cross-sectional perspective view of an artificial turf structure 8 according to the present invention formed by using the turf member 1. In the artificial grass structure 8, first, the grass member 1 shown in FIG. 1 is arranged at a predetermined interval using a frame member (not shown) and fixed, and then the whole grass is turned upside down. With the root of the above as the upper part, a sediment cinder comprising earth and sand and a polymer latex is poured from above, dried to form a bonding layer 5, and then it is turned over again, and then, on the bonding layer 5. It is formed by providing a layer 6 of sand for a more natural feeling.

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.

In FIG. 1, a bundle 4 composed of the folded net-like member 2 is bent at an intermediate portion in the lengthwise direction to form a U-shaped bundle, and a plurality of yarns are woven into each other to form a blind shape. A grass member assembly may be formed.

FIG. 4 shows another mode of the mesh member used for the grass member 1 of FIG. This mesh member 12 is manufactured by the same manufacturing process as that of the mesh member 2 shown in FIG. 3 except that it is not stretched. In this case, the intersections of the fibers are fused. However, it is not beaded.

FIG. 5 shows another aspect of the grass member 21 having a circular cross section. In this embodiment, a plurality of mesh members as shown in FIG. 2 are concentrically laminated and are tightly fixed with a thread 23 at the root portion A.

FIG. 6 shows a partial cross-sectional perspective view of an artificial grass structure 28 manufactured by using a plurality of grass members 21 shown in FIG. In this embodiment, the turf member 21 is fixed by a predetermined frame (not shown), and in this state, the whole is turned upside down, the root portion A is faced up, and the clay and sand binder is poured from above and dried. It is manufactured by forming the bonding layer 25, turning it over again, and spraying sand 26 on the bonding layer 25. In this mode, the grass member 21 can be easily arranged, which is very convenient.

FIG. 7 shows another aspect of the turf member 31. In this embodiment, the mesh members 32 are laminated concentrically, a plurality of columnar bundles 34 having a circular cross section are sequentially arranged, and the thread 37 is sewn at one end thereof with a sheet 38 such as cloth,
The bundle is fixed to each other to form a turf member that is easy to manufacture.

FIG. 8 shows a turf member 41 of still another aspect.
In this embodiment, a plurality of sheet-like net-like members 42 are laminated, folded back along the center line, and a thread 47 is sewn at the lower end portion in the figure to form the root portion A and the upper end portion It is formed by partially cutting.

(Effect of the invention) In the turf member used for the artificial turf structure of the present invention,
Since the mesh member made of synthetic resin fibers fused at the intersections is fixed in the state of being bundled or wound, the turf member is pressed from above, and even if it is crushed, if the pressure is released,
The original state is restored by the rigidity and restoring force based on the structure of the mesh member. Therefore, when a plurality of turf members are fixed to constitute the artificial turf structure of the present invention, even if the turf members are repeatedly subjected to the treading pressure, the turf members do not become stiff in a fallen state, and are stable upright for a long time. It is kept in the state where it did. Further, since the bonding layer bites into the mesh of the mesh member, the lawn member and the bonding layer are firmly bonded at the root portion. Therefore, the artificial turf structure of the present invention can maintain its strength for a long period of time, can easily pierce the tee on the turf member, and can maintain a natural feeling.

[Brief description of drawings]

1 is a plan view of a turf member used in the artificial turf structure of the present invention, FIG. 2 is a perspective view of a mesh member constituting the turf member of FIG. 1, and FIG. FIG. 4 is a partial cross-sectional perspective view of an artificial turf structure manufactured using the turf member of FIG. 1, and FIG. 4 is a perspective view of a reticulated member different from the reticulated member shown in FIG. 2. FIG. 5 is a perspective view of a turf member of a different mode from the turf member shown in FIG. 1, and FIG. 6 shows an artificial turf structure manufactured using the turf member shown in FIG. FIG. 7 is a partial cross-sectional perspective view, and FIGS. 7 and 8 are perspective views of a turf member of a different mode from the turf member shown in FIG. 1. 1, 21, 31, 41 ...... Turf member 2, 12, 22, 32, 42 ...... Mesh member 3, 23, 37, 47 ...... Thread 5, 25 ...... Bonding layer 6, 26 ...... Sand layer

Claims (4)

[Claims] 1. A turf member comprising a sheet-like net member made of synthetic resin fibers having fused intersections and holding means for holding the bundled or wound net member in a bundled or wound state. An artificial turf structure characterized in that a plurality of the turf members are fixed to each other so as to cover at least the root of the turf member with a bonding layer formed of a mixture of earth and sand and a polymer latex. 2. The artificial turf structure according to claim 1, wherein the reticulated member that has been bundled or wound is bent in a U-shape at an intermediate portion in the lengthwise direction. 3. The artificial turf structure according to claim 1, wherein the cross-section of the focused or wound mesh member is circular. 4. The artificial turf structure according to claim 1, wherein the plurality of focused or wound net-like members are connected to each other like a blind by a thread.