JP3366958B2 - Weed protection mat with ground reinforcement - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weed proof mat, and more particularly to a weed proof mat having a ground reinforcing property.

[0002]

2. Description of the Related Art As a conventional weed-proof mat, a non-light-permeable non-woven fabric has been used (Japanese Utility Model Publication No. 7-7379, Japanese Utility Model Publication No. 7-2302).
(See Japanese Patent Publication No. 1). That is, there is a mat in which a non-translucent non-woven fabric is laid on the ground, and thereby a weed-proofing effect is expected. If a non-translucent non-woven fabric is laid, the sunlight to the ground will be blocked, the seeds of weeds contained in the soil will not germinate, and a weed-control effect can be expected.

However, the conventional weed control mats have no resistance to flying seeds. That is, there is a problem that the flying seeds germinate on the non-woven fabric, the root thereof extends inside the non-woven fabric, reaches the ground, and grows large.

If a rubber sheet or a non-translucent synthetic resin sheet is laid in place of the non-woven fabric, it is possible to avoid the growth of flying seeds on the non-woven fabric. However, in this case, there were the following problems. That is, on the slope, for example, on the slope of a river, if a grass-controlling sheet made of a rubber sheet is laid, the weed seed contained in the soil cannot germinate as described above, and the grass-controlling effect is sufficient. Can be expected. Moreover, there is no problem that the flying seeds germinate and grow on the grass sheet. However, when the plant is eradicated on the slope (inclined surface), in other words, because the plant is not rooted in the soil of the slope, the ground on the slope is loosened and the ground is collapsed. I was invited.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object thereof is to have an excellent weed-preventing effect.
In addition, it is to provide a weed-proof mat that also has ground reinforcement properties.

[0006]

The weed-proof mat according to claim 1 is a weed-proof mat that is laid on the ground to prevent plants such as weeds from being exposed, and has a predetermined thickness. The support mat has an original three-dimensional mesh structure and a cover sheet such as a mesh sheet or a non-woven fabric, which is superposed on the upper surface of the support mat. The support mat has a diameter of 0.5.
A plurality of filaments of ~ 2 mm cross each other and bend regularly or irregularly in the horizontal direction, the thickness direction and the diagonal direction and extend, and inside thereof, there is a gap to the extent that plants such as weeds can grow. The cover sheet is water-permeable and light-transmissive, and inhibits the penetration of plants grown inside the support mat.

In the weed-preventing mat according to claim 1,
Since a cover sheet having water permeability and light transparency is superposed on the upper surface of a support mat having a three-dimensional three-dimensional mesh structure having a predetermined thickness, water and sunlight pass through the cover sheet and also pass through the support mat. Reach the ground. This allows the seeds in the soil to germinate even if a weed control mat is laid and continues to grow in the voids inside the support mat. However, as described above, since the cover sheet is superposed on the upper surface of the support mat, there is no concern that plants grown inside the support mat will penetrate the cover sheet and appear on the weed control mat. The plants continue to grow in the inner voids of the support mat. Meanwhile, many roots of the plant are stretched deep inside the ground, which contributes to the reinforcement of the ground.

Even if flying seeds fall on the weed-preventing mat (on the cover sheet), the supporting mat has a three-dimensional three-dimensional mesh structure having a predetermined thickness, so that the cover sheet to the ground is covered. There is some separation between them (ie, the flying seeds that have fallen onto the cover sheet and the ground are relatively far away), so that the seeds cannot take root on the weed control mat.

Since the support mat is formed by bending a plurality of filaments in a horizontal direction, a thickness direction and an oblique direction in a regular or irregular manner,
The mechanical strength (for example, compressive strength) is relatively large, and it is possible to minimize the destruction of the three-dimensional three-dimensional network structure when a person or a vehicle is placed on the grass mat.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION There are no particular restrictions on the material forming the filaments of the support mat, and synthetic resins (such as polypropylene and polyethylene) and metals (such as stainless steel) can be used. A low melting point thermoplastic resin such as polypropylene is preferable in that the filaments can be bonded (heat-bonded) to each other at the intersection. If the filaments are adhered (heat-bonded) to each other at the intersection, the mechanical strength of the support mat is further increased, which is preferable. In addition, the thickness of the striatum is 0.5 mm in diameter in the sense that it can resist the stepping on of people and vehicles.
The above is necessary. The upper limit is 2 mm in diameter in the sense that the support mat has an effective porosity.
A preferred range is 0.5 to 1.5 mm.

The thickness of the support mat is preferably 5 to 50 mm. If it is less than 5 mm, the distance between the cover sheet and the ground becomes too small, and the possibility of germination of flying seeds becomes high. If it exceeds 50 mm, not only the handling becomes poor, but also it grows inside the support mat. There is a possibility that the plant becomes too large and lifts the weed control mat as the plant grows. In addition, it is more preferably 10 to 30 mm.

The porosity of the support mat is preferably 85 to 98%. If it is less than 85%, the growth of plants inside the support mat may be impaired, and
If it exceeds%, the mechanical strength may be adversely affected. More preferable range is 90-9
5%.

The cover sheet is made of a mesh sheet (fiber knitted fabric) having holes formed of meshes formed at predetermined intervals, and the vertical and horizontal sizes of the holes are 0.1 to 4 mm.
It is preferably × 0.1 to 4 mm. 0.1 mm
When it is less than 4 mm, the light and water permeability is reduced, and there is a possibility that the growth of plants inside the support mat may be poor. When it exceeds 4 mm, the plants grown inside the support mat pass through the holes and cover sheet. There is a possibility that it will penetrate through. The preferred range is 0.2 to 3 mm. Instead of using the mesh sheet, a non-woven fabric having a water permeability and a light transmissive property of the same level (weight per unit area: 70 to 220 g / m ² ) can also be used.

It is preferable that the support mat and the cover sheet are previously joined to each other and integrally formed, because the weed-preventing mat can be easily laid, but there is no particular limitation. An adhesive may be used for integration at the time of laying. When the support mat is made of a thermoplastic resin when it is integrated during installation, heat can be applied to the upper surface of the support mat to melt a part of the support mat, and the cover sheet can be covered and fused before being cured.

It is preferable that the support mat and the cover sheet are provided with heat resistance so that the weed-preventing mat does not deteriorate even if it is exposed to intense summer sunlight for a long time. There is no particular limitation on the compound capable of imparting heat resistance,
Tetrakis (2,4-di-t-butylphenyl) 4,
4'-biphenylene diphosphonate, distearyl pentaerythritol diphosphite, tris (2,4-
Di-t-butylphenyl) phosphite, 3,4,5,
Phosphorus stabilizers such as 6-dibenzo-1,2-oxaphosphan-2-oxide, tetrakis [methylene-3 (3,3
5-di-t-butyl-4-hydroxy-phenyl) propionate] methane, 2,6-di-t-butyl-4-
A phenolic stabilizer such as methyl-phenol and 2-t-butyl-4-methoxyphenol and a sulfur-containing stabilizer such as mercaptopropionic acid ester can be used.

In order to prevent deterioration due to rainwater,
It is preferable that the support mat and the cover sheet have weather resistance (water resistance, ultraviolet absorber, light stabilizer). The compound capable of imparting weather resistance is not particularly limited, and examples thereof include 2- (2′-hydroxy-3 ′,
5'-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'-di-t-amylphenyl) benzotriazole, 2,2'
-Methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2-N-benzotriazol-2-yl) phenol], 2- (2'-hydroxy-5'-methylphenyl) Benzotriazole, 2- (2'-hydroxy-3 ', 5'-dicumylphenyl) phenylbenzotriazole, 2- (2'-hydroxy-5'-t-
Triazole-based UV absorbers such as octylphenyl) benzotriazole, bis (2,2,6,6-tetramethyl-4-piperazinyl) sebacate, poly [[6-
(1,1,3,3-tetramethylbutylimino) -1,
3,5-triazine-2,4-diyl]-[4- (2,
2,6,6-Tetramethylpiperidinyl) -imino]-
[4- (2,2,6,6-tetramethylpiperidinyl)
-Imino]] and the like. Among them, the triazole type is effective. It is also possible to impart water resistance by coating or spraying with a fluororesin.

The heat stabilizer and the weather resistance agent are 0.01 to 2.0 p.
It is preferable to add it for hr.

[0018]

EXAMPLES An example of the present invention will be described below, but the present invention is not limited thereto.

The weed-preventing mat (10) of the present invention is, for example, as shown in FIG. 1, a supporting mat (12) having a three-dimensional three-dimensional mesh structure and an adhesive (heat-melting) on the upper surface of the supporting mat (12). Worn mesh sheet (14). Both the supporting mat (12) and the mesh sheet (14) have a heat stabilizer and a weather resistance compounded in their raw material components to impart heat resistance and weather resistance.

The support mat (12) has a large number of polypropylene filaments (16) having a diameter of 1 mm, which are bent in the horizontal direction, the thickness direction and the diagonal direction at regular intervals while intersecting each other, and are bonded to each other at their intersections. It has a bulky net-like shape with a thickness of 25 mm and a porosity of 95%, which is formed by (heat-sealing).

The mesh sheet (14) has a thickness of 0.5 mm.
Is a plain weave, twill weave or satin weave in the form of mesh using the polypropylene monofilament as warp and weft, and the mesh size is 0.2 to 2 mm in length and width.

As described above, it is desirable that the support mat (12) has regular peaks and troughs formed by bending (refraction) of a large number of polypropylene filaments (16). The (14) is spot-bonded (heat-sealed) to the polypropylene filaments (16) located at the tops of the ridges which are present at predetermined intervals on the upper surface side of the support mat (12).

The weed-preventing mat (10) having the two-layer structure of the above-mentioned embodiment can be efficiently manufactured by using the apparatus schematically shown in FIGS. That is, as shown in the figure, a polypropylene resin melt is stored in a resin tank (20) having a plurality of spinning nozzles (not shown) having a hole diameter of 1 mm arranged in a row on the lower surface. From the spinning nozzle, polypropylene resin melts
′) Is spun out and falls naturally, and this is accumulated on the belt-shaped conveyor (22) running in the direction of the arrow. The conveyor (22) runs at a speed lower than the falling speed of the continuous filaments (16 ') made of a polypropylene resin melt, and its upper surface has an uneven shape. Therefore, the continuous filaments (16 ') made of the polypropylene resin melt on the conveyor (22) are
According to the concavo-convex shape of, it is formed into a wavy shape. That is, the continuous filaments (16 ') are accumulated while intersecting each other on the conveyor (22) and bent while bending in the horizontal direction, the thickness direction (vertical direction), and the diagonal direction. In, while the filaments are heat-sealed at the intersection, the mesh sheet (14) is placed under pressure on the continuous filaments (16 ') before the accumulated filaments are cured. This makes it possible to manufacture a weed-preventing mat having a two-layer structure. Thus, in the case of the present embodiment, the thickness of the support mat (12) and the size of the void (24) (internal space) are determined by the size of the unevenness of the conveyor (22).

Using a plurality of the weed-preventing mats (10) having the above constitution, the weed-preventing effect was actually examined outdoors.

That is, sowing seeds (seeds: 3 Nozawana, 3 Crane plants, 5 Kentucky 31 Festas) in the soil for the ground
Grain, 30 bluegrass, 10 white clover)
Then, several weed control mats (10) were laid on it, and several piles were pierced from the top to fix them to the ground. After that, an appropriate amount of water was given every day to observe the growth condition of the plants. As a result, after several days, the seeds germinated and continued to grow in the voids (24) inside the support mat (12). However, since the mesh sheet (14) is superposed on the upper surface of the support mat (12), the plant grown inside the support mat (12) penetrates through the mesh sheet (14) and becomes It did not appear above and the plant continued to grow laterally within the support mat (12). After growing to some extent, the weed-preventing mat (10) was removed, and the plant was dug up, and many roots of the plant were laid deep in the ground. In addition, flying seeds did not fall on the weed-control mat (10) (on the mesh sheet (14)) and did not grow on the weed-control mat (10).

The size (void ratio) and thickness of the voids (24) in the support mat, the mesh size of the cover sheet, and the type of the cover sheet (mesh sheet, non-woven fabric) are shown in the following [Table 1] to [Table 4]. The same experiment was performed by changing each as shown in FIG. It should be noted that, in the table, those with "good" as the weed-preventing effect show good growth of the plant in the voids of the support mat (that is, the ground-reinforcing action of the root of the plant can be expected sufficiently), and the plant has good control. It does not penetrate through the grass mat (cover sheet) and also inhibits the growth of flying seeds.

[0027]

[Table 1]

[0028]

[Table 2]

[0029]

[Table 3]

[0030]

[Table 4]

[0031]

Industrial Applicability According to the present invention, it is possible to provide a weed-preventing mat which is excellent in the weed-preventing effect and also has a ground reinforcing property.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a weed control mat showing an embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing a manufacturing process of a support mat in the weed-preventing mat of FIG.

FIG. 3 is a schematic side view showing a step of superimposing a mesh sheet on the support mat of FIG.

FIG. 4 is a partial cross-sectional view showing a state in which a plant has grown in an internal space of a support mat.

[Explanation of symbols]

10 …… Weedproof mat 12 ... Support mat 14: Mesh sheet 16: Polypropylene filament 24 ... void

─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-9-140274 (JP, A) JP-A-6-7044 (JP, A) JP-A 64-16543 (JP, A) Actual development Sho-61- 110251 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01G 13/00 302 A01M 21/00 E02D 17/20 102

Claims (8)

(57) [Claims] 1. A weed-preventing mat laid on the ground to prevent plants such as weeds from being exposed, the support mat having a three-dimensional three-dimensional mesh structure having a predetermined thickness, and the support mat being superposed on the upper surface of the support mat. The support mat has a plurality of filaments having a diameter of 0.5 to 2 mm that intersect with each other and extend in a horizontal direction, a thickness direction, and an oblique direction by regular or irregular bending, and Inside thereof, it is provided with voids to the extent that plants such as weeds can grow, the cover sheet has water permeability and light transmission, and inhibits the penetration of plants grown inside the support mat. A mat for weed control, which is characterized by being 2. The weed control agent according to claim 1, wherein a plurality of filaments of the support mat are made of a thermoplastic resin and are heat-sealed to each other at intersections of the filaments. mat. 3. The weed proof mat according to claim 1, wherein the thickness of the support mat is 5 to 50 mm. 4. The weed proof mat according to claim 1, wherein the support mat has a porosity of 85 to 98%. 5. The cover sheet is a mesh sheet made of a fiber knitted fabric, and has holes made of a mesh formed at predetermined intervals, and the holes have a lengthwise and widthwise size of 0.1 to 4.0.
The mat for grass according to any one of claims 1 to 4, which has a size of mm x 0.1 to 4.0 mm. 6. The weed proof mat according to claim 1, wherein the support mat and the cover sheet are joined to each other and are integrally formed. 7. The weed-proof mat according to claim 1, wherein the support mat and the cover sheet are provided with heat resistance. 8. The weed-proof mat according to claim 1, wherein the support mat and the cover sheet are provided with weather resistance.