JPH08128009A - Synthetic resin made artificial lawn - Google Patents

Abstract

PURPOSE: To provide an external appearance like natural lawn and excellent long time durability. CONSTITUTION: A plurality of synthetic resin made band-like base body parts 1, 1,... are arranged in parallel to each other with intervals and a plurality of synthetic resin made leaf-like parts 2, 2,... are arranged in the longitudinal direction of the base body parts 1, 1,... with intervals. Respective leaf-like parts 2, 2,... are equipped with a plurality of leaf pieces. Each leaf-like part 2 is integratedly formed with the adjoining base body part 1. The leaf piece of the leaf-like part 2 is branched into two or more pieces from a middle part to a tip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin artificial turf, and more specifically, a plurality of synthetic resin belt-like base portions are arranged in parallel at intervals, and a plurality of base portions are provided between the base portions. The synthetic resin leaf-shaped parts are arranged at intervals in the longitudinal direction of the base part, each leaf-shaped part is provided with a plurality of leaf pieces, and each leaf-shaped part is formed integrally with the adjacent base part. Related to synthetic resin artificial grass.

[0002]

2. Description of the Related Art Conventionally, as described in JP-B-48-44721, a plurality of synthetic resin belt-like base portions are arranged in parallel at intervals, and a plurality of base portions are provided between these base portions. The synthetic resin leaf-shaped parts are arranged at intervals in the longitudinal direction of the base part, each leaf-shaped part is provided with a plurality of leaf pieces, and each leaf-shaped part is formed integrally with the adjacent base part. Synthetic resin artificial grass is known. Such synthetic resin artificial grass is used for rugs such as balconies and roofs of general houses, hotels, department stores, etc., and recently, tennis, baseball,
It will also be laid in gateballs and other stadiums and practice areas.

In addition, when it is used in a walking path of a golf course or the like, synthetic resin artificial grass is used to improve the walking feeling more like natural grass and the breakage resistance of leaf-like parts by spike shoes. So-called sand-filled synthetic resin artificial turf filled with a filler is widely used.

In such synthetic resin artificial grass,
In order to improve the durability of leaf-shaped parts
As described in Japanese Patent Publication No. 29, a leaf-shaped leaf piece is made of at least two different thicknesses, and is made of a synthetic resin in which the length of the thick leaf piece is not longer than the length of the thin leaf piece. Artificial grass is known.

[0005]

However, as described in Japanese Utility Model Laid-Open No. 54-57829, the leaf-shaped leaf pieces are composed of at least two different thicknesses,
Synthetic resin artificial turf, in which the length of the thick leaf pieces is not longer than the length of the thin leaf pieces, the thin leaf pieces have poor durability against abrasion, and when they are thickened to improve durability, they become stiff and have a feeling of walking. In addition, since the leaf pieces have different lengths, when filled with a filler such as sand, the leaf pieces protruding from the filler have different thicknesses and lengths, resulting in a poor appearance. It was

The present invention has been made as a result of earnest research focusing on such problems in the conventional synthetic resin artificial turf. The object of the present invention is to solve the problems in the conventional synthetic resin artificial turf. Resolving the points, excellent long-term durability,
An object of the present invention is to provide an artificial grass made of synthetic resin that gives an appearance like natural grass.

[0007]

In order to achieve the above object, in the synthetic resin artificial turf of the present invention, a plurality of synthetic resin strip-shaped base portions are arranged in parallel at intervals. A plurality of synthetic resin leaf-shaped portions are arranged at intervals in the longitudinal direction of the base portion, a plurality of leaf pieces are provided in each leaf-shaped portion, and each leaf-shaped portion is integrated with an adjacent base portion. In the artificially formed synthetic grass made of synthetic resin, the leaf pieces of the leaf-like portion are branched into two or more pieces from the middle portion to the tip.

The synthetic resin artificial grass of the present invention will be described in detail below with reference to the drawings. 1 is a perspective view showing an example of the synthetic resin artificial turf of the present invention, FIG. 2 is an enlarged cross-sectional view of a part thereof, and FIG. 3 is a filling method of filling the synthetic resin artificial turf of the present invention shown in FIG. It is an expanded sectional view showing the state. 1 to 3, A is an artificial grass made of the synthetic resin of the present invention,
.. are strip-shaped base portions of the synthetic resin artificial turf A, and the strip-shaped base portions 1, 1, ... Are arranged in parallel at regular intervals. .. are leaf-shaped portions, a large number of which are arranged between the base portions 1 and 1 adjacent to each other at regular intervals, and the roots 21 of the leaf-shaped portions 2, 2, ... It is formed integrally with the part 1.

As shown in FIG. 2, each leaf-shaped portion 2, 2, ... Is composed of a plurality of leaf pieces 22, 22 ,.
A branch portion 23 is provided in the middle of each of 2, 22, ..., And two strips 24, 24 are formed above the branch portion 23. The shape of the leaf piece 22 is not particularly limited, and for example, in addition to a cylinder and an elliptic cylinder, a polygonal prism such as a triangular prism and a quadrangular prism, a pyramid such as a cone and a quadrangular pyramid, or a pseudo-shape as illustrated. The lawn leaf shape can be used.

The thickness of the portion of the leaf piece 22 below the branch portion 23 may be arbitrary, but for example, when the leaf piece 22 has a pseudo-turf shape as shown in the drawing, it is preferably about 0.5 to 3 mm. . If the thickness is less than 0.5 mm, the breakage due to abrasion becomes remarkable, which is not preferable. On the other hand, if it is larger than 3 mm, it does not have a pseudo-turf shape, which is not preferable.

The width of the portion of the leaf piece 22 below the branch portion 23 may be arbitrary, but for example, when the leaf piece 22 has a pseudo-turf shape as shown in the drawing, it is preferably about 2 to 7 mm.
If the width is smaller than 2 mm, the width of the strip 24 above the branch portion 23 of the leaf piece 22 is necessarily 1 mm or less, which is not preferable because the strength of the strip 24 is significantly reduced. or,
If it exceeds 7 mm, it does not have a pseudo-turf shape, which is not preferable.

The thin piece 24 may have any thickness, but for example, when the leaf piece 22 has a pseudo-turf shape as shown, it is preferably about 0.3 to 3 mm. When the thickness of the strip 24 is larger than the thickness of the portion of the leaf piece 22 below the branch portion 23, the leaf piece 22 has a so-called undercut shape when manufactured using a mold as described below. Mold release becomes difficult, which is not preferable. The thickness of the strip 24 is 0.3
If it is less than 1, it is not preferable because the strength is significantly reduced.
If it exceeds 3 mm, the rigidity of the strip 24 becomes excessive, and the feeling of walking is deteriorated, which is not preferable.

The width of the strip 24 may be arbitrary, but for example,
If the leaf piece 22 has a pseudo-turf shape as shown, then 1
It is preferably about 3.5 mm. The width of strip 24 is leaf 22
If the width of the portion below the branch portion 23 is larger than the width of the branch portion 23, the leaf piece 22 has a so-called undercut shape when it is manufactured using a mold as described later, and it is difficult to release the mold, which is not preferable. . If the width of the strip 24 is less than 1 mm, the strength of the strip 24 is significantly reduced, which is not preferable.
If it exceeds 3.5 mm, the pseudo-turf-shaped appearance will not be exhibited, which is not preferable.

The height of the branch portion 23 may be arbitrary, but FIG.
As shown in FIG. 5, when filling the filler 3 such as sand, it is preferable that the height of the filler 3 is approximately the same in consideration of the filling amount of the filler 3. When the height of the branching portion 23 is higher than the filling height of the filling material 3, the portion of the leaf piece 22 below the branching portion 23 and the branching portion are exposed, which is not preferable in appearance, and when walking or running, It is not preferable because a feeling of strangeness is felt by stepping on the lower portion of the leaf piece 22 having a large thickness and width. Further, when the height of the branching portion 23 is lower than the filling height of the filling material 3, a part of the strip 24 is buried in the layer of the filling material 3, so that the durability due to the wear of the portion is significantly reduced. It is not preferable because

Regarding the branch portion 23, it is preferable that the shape of the branch portion 23 is curved to avoid an acute angle in order to relax the stress applied to the branch portion 23 and reduce the breakage due to the notch effect.

In order to provide the leaf-shaped portion 2 with a natural grass-like appearance, the leaf-shaped portion 2 is bent at random by using a pressure roll or a pressure press on the leaf-shaped portion 2. Is preferably dispersed in

The synthetic resin as the material of the base portion 1 and the leaf portion 2 is not particularly limited, but for example,
Olefin resins such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-vinyl acetate copolymer, Vinyl chloride resin, vinylidene chloride resin, vinyl chloride resin such as vinyl chloride-vinyl acetate copolymer, styrene resin such as polystyrene, amide resin such as nylon 6, nylon 6.6 and nylon 6.10, polyethylene terephthalate Polyester such as polybutylene terephthalate, and other synthetic resins can be used. These synthetic resins may be used alone,
Two or more kinds may be used in combination, but an olefin resin is preferable in terms of moldability and economy.

It is preferable to use the same kind of synthetic resin for the base portion synthetic resin and the leaf-shaped synthetic resin, but different synthetic resins may be combined as long as they are compatible with each other. Further, if necessary, a pigment for coloring, an antioxidant for imparting climate resistance, a light stabilizer, a lubricant which is a processing aid, and the like may be added.

In addition, in the production of the synthetic resin artificial grass of the present invention, it is possible to mold one by one in a batch system such as injection molding, but it is economical to continuously mold long grass. It is advantageous. In addition, it is preferable to use sand or gravel as the filler when filling the filler such as sand in consideration of durability and cost. Although the filling amount of the filler such as sand may be arbitrary, it is preferable to fill the leaf-shaped portion 2 so that the tip of the leaf-shaped portion 2 projects by at least about 2 mm. When the protrusion of the leaf-shaped portion 2 is less than 2 mm, Most of the leaf-shaped portion 2 is buried in the layer of the filler, which does not give the appearance of grass and is not preferable.

[0020]

In the synthetic resin artificial turf according to the first aspect of the present invention, since the leaf pieces of the leaf-like portion are branched into two or more pieces from the middle portion to the tip, the portion below the branch portion has a thickness and By setting the width to a large value, the durability against abrasion becomes excellent, and since the number of leaf pieces increases due to the branching above the branching portion, an excellent natural grass-like appearance can be obtained.

[0021]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view showing an example of the synthetic resin artificial turf of the present invention. The structure of the synthetic resin artificial turf A of the present invention shown in FIG. 1 has already been described above, and therefore the description thereof will be omitted here. As the synthetic resin forming the base portion 1 and the leaf-shaped portion 2, a dry blend of the following compounded resins is used. Low density polyethylene (NUC-8335 manufactured by Nippon Unicar) ... 100 parts by weight Hindered phenolic antioxidant as a processing stabilizer (“IRGANOX1010” manufactured by Ciba-Geigy) ... 0.2 parts by weight Light stabilizer As a hindered amine UV stabilizer (“CHIMASSORB 944” manufactured by Ciba-Geigy) ... 0.5 parts by weight

The overall width of the synthetic resin artificial grass of the present invention is 10
The base portion 1 has a thickness of 3 mm, a width of 4 mm, and the leaf portions 2 have a pitch width of 10 mm. Branch part 23 of leaf-shaped part 2
Has a height of 18 mm, the thickness of the root of the leaf piece 22 is 2 mm, the width is 5 mm, the thickness near the branching portion 23 is 1.3 mm, and the width is 4
mm, the length of the strip 24 above the branch portion 23 is 6 mm,
The strip 24 has a base thickness of 1.3 mm and a width of 2 mm. The strip 24 has a tip end thickness of 0.6 mm and a width of 1 mm. The roots of the leaf pieces 22 of the leaf-shaped portion 2 are arranged in parallel on the circumference of a circle having a diameter of 7 mm by four pieces, and the leaf pieces 22 have a tufted shape.

Next, an apparatus for producing the synthetic resin artificial turf A of the present invention shown in FIG. 1 will be described with reference to FIGS. As shown in FIGS. 4 to 7, on the outer peripheral surface 41 of the molding drum 4, a large number of base portion molding grooves 42, 4 are formed along the circumferential direction.
.. (FIG. 5) are formed at equal intervals in the width direction (direction perpendicular to the paper surface in FIG. 4) and are adjacent to each other.
A large number of leaf-shaped portion forming cavities 43, 43, ... The root portions of which are communicated with the forming groove 42 are provided at predetermined intervals between the two and 42, and are arranged so as to have a matrix shape as a whole. .

The leaf-shaped portion forming cavity 43 has a through hole 43.
1 and the insert member 432 fitted therein, the leaf-shaped portion 2 including the root is molded. Further, a partitioning convex portion 44 is provided between the cavities 43. When the outer peripheral surface 41 of the forming drum 4 is closed by the extrusion head 5, a leaf-shaped portion forming space is formed. Further, on the front surface 51 side of the extrusion head 5, partition members 52, 52 which are respectively fitted into the respective base portion molding grooves 42 of the molding drum 4.
.., a base portion forming nozzle 53, and a leaf portion forming nozzle 54 are provided. The shape of the partition member 52 is also shown in FIG.

The tip of the base portion forming nozzle 53 into the base portion forming groove 42 is disposed at a position corresponding to the partition member 52, and the leaf-shaped portion forming nozzle 54 is inserted into the leaf-shaped portion forming cavity 43. The tip is arranged between the partition members 52, 52. Explaining such an operation, first, in each of the cavities 43 arranged in a row in the width direction of the molding drum 4, the leaf-shaped portion molding resin is discharged from the leaf-shaped portion molding nozzles 54 arranged in a row in the width direction of the extrusion head 5. Each of them is extruded, and when this extruding is finished, the extruded parts are similarly extruded into the cavities 43 of the next row in accordance with the rotation of the forming drum 4, and thereafter sequentially extruded.

In this way, the cavities 43 in each row into which the resin has been injected are sequentially fed at a constant pitch in the rotational direction as the molding drum 4 rotates. Next, the base portion forming resin is extruded from the base portion forming nozzles 53, 53 arranged in a row in the width direction into the base portion forming grooves 42, 42, ... Of the forming drum 4 to rotate the forming drum 4. According to
The base portion is sequentially and continuously molded. At this time, the resin of the leaf-shaped portion existing between the base portions is welded to and integrated with the resin of the base portion 1.

A sample obtained by cutting the synthetic resin artificial grass material thus obtained into 30 × 30 cm is 70 ° C.
After heating for 1 hour in the atmosphere, press temperature 25 ° C with a hand press, 6 m clearance between the upper mold and the lower mold.
Pressing for 10 seconds under m condition, the total thickness is 22mm
A synthetic resin artificial turf A of the present invention shown in FIG.

[Comparative Example] In the example, the leaf-shaped portion 2 has a structure in which the leaf piece 22 does not have the branch portion 23.
Height of leaf is 24mm, thickness of root of leaf piece is 1.3m
m, the width is 2 mm, the thickness of the tip of the leaf piece 22 is 0.6 mm,
The width is 1.3 mm, and the root of the leaf piece 22 is 8 mm in diameter.
An artificial turf made of synthetic resin was obtained in the same manner as in the example except that eight tufts were arranged side by side on the circumference of the above.

[Evaluation] The synthetic resin artificial turf samples obtained in the above-mentioned Examples and Comparative Examples were evaluated for the durability of the leaf portions. In the above sample, a so-called silica sand No. 3 (“F-3 No.” manufactured by Sankyu Kaiun Co., Ltd.) having a height of 18 was used.
Evenly filled to a size of mm, weigh 60 kg
The number of leaf pieces in which breakage was observed was measured after the person had stepped up to 10,000 times, and the breakage rate was calculated by dividing the value by the total number of grass pieces. Table 1 shows the results. The test conditions at this time are as follows. Environment: Temperature 23 ° C, Humidity 50% RH Footwear: Golf shoes (size 26 cm, "CLIENT" manufactured by Kryan Co., Ltd.) Trampling conditions: Stepping method (100 steps / minute)

[0030]

[Table 1]

In the synthetic resin artificial grass of the present invention shown in FIG. 3, as shown in Table 1, when the number of times of stepping is about 4000 times, there is no great difference from the comparative example, but at 6000 times, the breakage rate is remarkable. Reduce.

Although the embodiments of the present invention have been described above with reference to the drawings, the configuration of the present invention is not limited to the illustrated embodiments, and design changes within the scope of the present invention are included in the present invention. Be done. For example, in the embodiment shown in FIG.
The leaf piece 22 is branched into two at the upper side from the branch portion 23, but may be branched into three or more.

[0033]

INDUSTRIAL APPLICABILITY In the synthetic resin artificial grass of the present invention, since the leaf pieces of the leaf-like portion are branched into two or more from the midway portion to the tip, the thickness and width of the lower portion of the leaf piece are larger than the branch portion. By setting it, the durability against abrasion becomes excellent, and since the number of leaf pieces increases in the portion above the branch portion due to branching, an excellent appearance of natural grass is obtained.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of a part of the artificial grass of the present invention shown in FIG.

FIG. 3 is an enlarged cross-sectional view showing a state where the artificial grass of the present invention shown in FIG. 1 is filled with a filler.

FIG. 4 is a partially cutaway cross-sectional view showing an example of the artificial turf production apparatus of the present invention.

5 is a cross-sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a partially cutaway perspective view showing a partition member on an extrusion head of the manufacturing apparatus shown in FIG.

[Explanation of symbols]

 A Synthetic resin artificial turf 1 of the present invention 1 base part 2 leaf-like part 21 root 22 leaf piece 23 branching part 24 strip 3 filler

Claims (1)

[Claims] 1. A plurality of synthetic resin strip-shaped base portions are arranged in parallel at intervals, and a plurality of synthetic resin leaf-shaped portions are arranged between these base portions in the longitudinal direction of the base portion. In a synthetic resin artificial turf, which is arranged apart from each other, each leaf-shaped portion is provided with a plurality of leaf pieces, and each leaf-shaped portion is integrally formed with an adjacent base portion. Artificial grass made of synthetic resin, characterized in that it is branched into two or more toward the tip.