JP2003052295A - Weeding sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a weeding sheet which has excellent mechanical strengths, excellent durability, and low light transmittance, thereby gives high weeding effects, and is not affected by the reflection of solar light. SOLUTION: This weeding sheet is characterized by comprising a cloth-like article which is prepared by laminating one or more thermoplastic resin sheets to one or both sides of a cloth-like article formed from monoaxially stretched synthetic resin yarns and has a light transmittance of <10% and a weight of 50 to 500 g/m<2> . The monoaxially stretched yarns preferably comprise flat yarns, split yarns having many small breakages formed in the longitudinal direction, flat yarns formed by laminating different kinds of compositions, or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weeding sheet, and more particularly to a weeding sheet having high strength, excellent durability and a high weeding effect.

[0002]

2. Description of the Related Art Conventionally, river banks, field ridges, railways,
The embankment slope of the road is often washed away by sediment and must be prevented. Further, since weeds may cause pests to grow, it is necessary to mow frequently and prevent weeds from growing. However, cutting grass is labor intensive, and spraying herbicides is not preferable in terms of environmental damage.

As a method for solving such a problem, it has been proposed to lay a nonwoven fabric made of synthetic long fibers (Japanese Patent Publication No. 4-52727).

In order to prevent the overgrowth of weeds by laying such a sheet, various performances are required as a weeding sheet, and for example, mechanical strength is required to walk on it. In addition, it is also necessary to have excellent corrosion resistance and good durability. Furthermore, in order to prevent weeds, low light transmittance is required, and sunlight reflection does not damage the environment. Will also be required.

To the inventor of the present invention, the conventional weeding sheets were not sufficient to satisfy all the above requirements.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a weeding sheet which is excellent in mechanical strength and durability, has a low light transmittance, and thus has a high weeding effect, and is free from adverse effects due to reflection of sunlight. Is.

[0007]

Means for Solving the Problems The present invention has been made as a result of extensive studies to achieve such an object. Specifically, it is formed from a uniaxially stretched yarn formed by uniaxially stretching a synthetic resin. A thermoplastic resin sheet is laminated on one side or both sides of a cloth-like body, and a weeding sheet characterized by comprising a cloth-like body having a light transmittance of less than 10% and a mass of 50 to 500 g / m ^2. It is provided.

In the present invention, the uniaxially drawn yarn is the above weeding sheet made of a flat yarn, the above weeding sheet is a uniaxially drawn yarn made of a split yarn in which many small cuts are formed in the longitudinal direction, and a uniaxially drawn yarn. The above-mentioned herbicidal sheet comprising a laminated flat yarn of a different composition, the above-mentioned herbicidal sheet obtained by matting the surface of the herbicidal sheet, and
It is intended to provide the above-mentioned herbicidal sheet in which a cloth-like body is colored.

Further, according to the present invention, the above-mentioned weeding sheet obtained by heat-sealing uniaxially stretched yarns of the cloth-like body, the above-mentioned weeding sheet obtained by laminating a nonwoven fabric on the weeding sheet, and the cloth-like body are predetermined. The above-mentioned weeding sheet in which uniaxially drawn yarns of different colors are woven at intervals, the above-mentioned weeding sheet in which line marks are printed at predetermined intervals on the surface of the weeding sheet, and a plurality of cloth-like bodies are predetermined. It is intended to provide the above weeding sheet laid with an overlapping margin, and the above weeding sheet in which a cloth-like body is locked with a synthetic resin pile material.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a herbicidal sheet 1 of the present invention uses a uniaxially stretched yarn 2 formed by uniaxially stretching a synthetic resin as a cloth body.

As the uniaxially drawn yarn 2, a synthetic resin having an excellent drawing effect is used. Generally, high density polyethylene,
Polypropylene, polyester, polyamide and the like can be used.

In the present invention, the uniaxially drawn yarn 2 constituting the herbicidal sheet 1 broadly means a long product capable of forming the herbicidal sheet 1, and is a wire such as a film-shaped body, a string-shaped body, a band-shaped body or a monofilament. It includes a body, which may be twisted or untwisted.

The cross-sectional shape of the uniaxially drawn yarn 2 is arbitrary, and may be round, oblong, square, polygonal, or any other irregular shape. Further, the flexibility can be increased by extruding a mixture of different kinds of resins into filaments, and dividing the resins to use fibrillated danlines. Further, as shown in FIG. 3 (A), a synthetic resin film can be slit into a predetermined width and uniaxially stretched to be used as a tape, and a tape-shaped body shown in FIG. 3 (B). As described above, it is possible to form a split yarn by making a large number of cuts 5 and 5. Further, as shown in FIG. 3 (C), the tape-shaped body may be provided with extremely fine vertical ribs 6 and 6. By providing the ribs 6, reflected light of the sun is scattered and the influence on the environment is reduced. be able to.

As the uniaxially drawn yarn 2, it is possible to use one uniaxially drawn synthetic resin filament alone as a weaving strand, and use a bundle of a plurality of filaments. You can

The uniaxially drawn yarn 2 may be a single layer as shown in FIG. 4 (A), or on one side or both sides of the base layer 7 as shown in FIGS. 4 (B) and (C). The surface layer 8 can be provided, and the surface layer 8 can function as a bonding layer or a matte layer. Alternatively, a sheath core structure may be used as shown in FIG. 4D and a side-by-side method may be used as shown in FIG.

The joining layer is for joining the uniaxially drawn yarns 2 after the uniaxially drawn yarns 2 are made into a cloth shape, or for joining with a sheet-like body of a thermoplastic resin described later, and serves as a joining layer. As the synthetic resin for forming the surface layer 8, the base layer 7 is used.
A synthetic resin having a lower melting point than that of the synthetic resin and having excellent heat fusion property is used.

Specifically, polyethylene, polypropylene, polyolefins such as ethylene / propylene copolymers, polyesters such as polyethylene terephthalate and polybutylene terephthalate, nylon 6, nylon 66.
Polyamide or the like can be used, and a synthetic resin having a lower melting point than that of the base layer is selected in relation to the synthetic resin of the base layer.

Further, in the present invention, the uniaxially drawn yarn 2
A pigment may be added to the base layer 7 and / or the surface layer 8 constituting the above or both of them to adjust the light transmittance. Although the coloring color is not a limitation of the present invention, it is preferable that it has a calm shade to reduce the influence on the environment, and it is preferable that it is black, green, brown or the like.

In addition, an inorganic filler can be added to the uniaxially drawn yarn 2, and by adding the inorganic filler, it can be matted and the reflection of sunlight can be weakened. As the inorganic filler, talc, carbon black, graphite, titanium dioxide, silica, mica, calcium carbonate, calcium sulfate, barium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, alumina, kaolin, silicon carbide, metal powder or the like is used. be able to.
The inorganic filler may be added to the entire uniaxially drawn yarn 2, or may be added to the surface layer 6 forming the surface.

Further, various additives can be added to the synthetic resin forming the base layer 7 or the surface layer 8 used as the uniaxially drawn yarn 2 depending on the purpose.

Specifically, antioxidants such as phenolic and organic phosphite-based organophosphorus and thioether-based antioxidants; hindered amine-based light stabilizers; benzophenone-based, benzotriazole-based, and benzoate-based ultraviolet absorbers Agents; nonionic, cationic, anionic, etc. antistatic agents; bisamide, wax, organometallic salt, etc. dispersants; amide, wax, organometallic salt, ester, etc. lubricants, bromine-containing A flame retardant such as an organic type, a phosphoric acid type, antimony trioxide, magnesium hydroxide, or red phosphorus can be used.

These additives are appropriately combined and blended in any step of manufacturing the material composition of the base layer 7 and the surface layer 8. The additives may be prepared by mixing the additives at a predetermined ratio using a kneading device such as a conventionally known twin screw extruder, Banbury mixer, kneader mixing roll, etc. A so-called masterbatch having a concentration may be prepared and used by diluting it.

When a laminated body is used as the uniaxially drawn yarn 2, a film to be the base layer 7 and a surface layer 8 are preliminarily used as a means for molding a laminated flat yarn or a laminated film which is a molding material for the laminated split yarn. To form a film having a different thickness by using a dry laminating method or a thermal laminating method, a method of coating the surface of the film to be a base layer 7 with a synthetic resin to be a surface layer 8, and a preformed base layer 7. The surface layer 8 may be extrusion-laminated on the film, or may be appropriately selected from known means such as extrusion-molding as a laminated film by a multi-layer coextrusion method. From the viewpoint of the adhesiveness between the layers, it is desirable to obtain the laminate of the base layer 7 and the surface layer 8 in one step by the multi-layer coextrusion method. For the sheath core structure or the side-by-side structure, the coextrusion method is generally used.

As means for drawing the uniaxially drawn yarn 2, the film to be the base layer 7 is uniaxially drawn, and then the synthetic resin to be the surface layer 8 is laminated and slit into a tape shape. Alternatively, it can also be obtained by slitting the laminated film in which the base layer 7 and the surface layer 8 are laminated, or before or after slitting, and stretching in a uniaxial direction. The stretching ratio is usually about 3 to 10 times.

The thickness of the uniaxially drawn yarn 2 is not limited in any way and can be arbitrarily set according to the purpose, but it is generally 500 to 10000 decitex, preferably 10 decitex.
00-5000 decitex, yarn width 0.3-200m
m, preferably 1.0 to 100 mm, thread thickness 5 to 500
The range is μm.

The uniaxially stretched yarn 2 can be used as a woven fabric by weaving the uniaxially stretched yarn 2 as shown in FIG. 1 (A), and as shown in FIG. It can also be used as a softener by arranging the uniaxially drawn yarns 2 in parallel with each other and tying the intersections to each other. It can also be used as a non-woven fabric.

A thermoplastic resin sheet 4 is laminated on one side or both sides of the obtained cloth-like body 3. A film or a non-woven fabric can be used as the thermoplastic resin sheet 4,
Examples of the thermoplastic resin forming the thermoplastic resin sheet 4 include high-pressure process low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene / propylene copolymers, ethylene / vinyl acetate copolymers, and other polyolefins and polyesters. , Polyamide, etc. can be used.

Further, other compound may be added to the thermoplastic resin constituting the sheet 4 depending on the purpose, and an antioxidant, a light stabilizer, an ultraviolet absorber, a plasticizer, an antistatic agent dispersion. Agents, chlorine scavengers, lubricants, flame retardants, pigments, etc. can also be added.

In the present invention, the herbicidal sheet 1 is colored to have a light transmittance of less than 10% and a mass of 50 to 500 g / m.
^{It is} a cloth-like body of ² . When the light transmittance is 10% or more, it is difficult to obtain the herbicidal effect, and when the mass is less than 50 g / m ^2, it is difficult to secure the light-shielding property, and when the mass exceeds 500 g / m ² , the economical efficiency is deteriorated.

Although the coloring can be performed on the uniaxially drawn yarn 2 as described above, it is preferable to perform the coloring on the thermoplastic resin sheet 4. The coloring color is not a limitation of the present invention, but the environment is not limited. It is preferable to have a calm shade so as not to damage it, and black, green, brown or the like is used.

The weeding sheet 1 can have different colors on both sides, and its lower surface is black for light shielding,
The upper surface can be made to have a color such as green or brown that is inconspicuous.
The sheet 4 need not be laminated on the entire surface of the cloth-like body 3,
It may be partially laminated depending on the purpose.

Furthermore, an inorganic filler can be added to the sheet 4. Matting can be achieved by adding an inorganic filler, and sunlight reflection can be weakened. As the inorganic filler, talc, carbon black, graphite, titanium dioxide, silica, mica, calcium carbonate, calcium sulfate, barium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, alumina, kaolin, silicon carbide, metal powder or the like is used. be able to.
The amount of the inorganic filler added is 3 to 50%, preferably 5 to 30.
% Is preferable. The matte finish is satin finish roll,
It can also be performed using an embossing roll or an engraving roll.

Further, as shown in FIG. 5 (A), it is preferable that the weeding sheet 1 be woven with threads 9 of different colors at predetermined intervals. By weaving the threads 9 of different colors, it becomes easy to position the sheet when laying it or locking it with pins, piles or the like. The positioning mark can also be printed by printing a line mark with ink.

Further, the weeding sheet 1 of the present invention has the structure shown in FIG.
As shown in (B), drainage material 1 such as non-woven fabric, if necessary.
0 can be attached, and it is also possible to attach a reinforcing rope 11 to the side portion of the sheet 1 as shown in FIG. 5 (C). At that time, a tough sheet that can withstand strong winds can be obtained.

The weeding sheet 1 of the present invention is, as shown in FIG. 6, a ridge of a field, a bank of a river, a backside of an embankment of a railway track,
The weeding function can be achieved by laying it on a place where weeding should be performed, such as a road embankment slope, a road median strip, or a lower part of a steel tower. It is desirable that the weeding sheets 1 of the present invention are laid so that adjacent weeding sheets 1 are overlapped with each other as shown in FIG.

The weeding sheet 1 of the present invention can be fixed by laying it at a place to be weeded and locking it with a pin, a pile or the like 13. As the pins, piles 13 and the like, a ship-nail-shaped body made of metal, synthetic resin or the like, or a U-shaped body can be used.

Further, the weeding sheet 1 of the present invention is generally laid on the surface of a place to be weeded, but it can also be laid as an underlaying material on a laying place such as a cobblestone.

[0038]

Examples (Example 1) Polyethylene (manufactured by Japan Polychem Co., Ltd.) was melt-extruded to form a film by an inflation molding method, and a film was slit using a leather. Temperature of the slit resin tape is 110-120 ℃
After being stretched 7 times on the hot plate of No. 3, the relaxation heat treatment of 6% was performed in a hot air circulation type oven at a temperature of 120 degrees, and the film was wound on a winder. The single yarn fineness of the obtained drawn tape is 190.
The yarn width was 0 dt and 8 mm.

The drawn tape thus obtained was woven using the number shown in Table 1 to form a woven cloth of 2 m × 2 m.
100 seeds of paddy were sown for 5 m × 1.5 m and laid. Thirty days after that, the number of seedlings that had been greened was counted and the germination growth rate was investigated. Table 1 shows the relationship between the light transmittance and the germination growth rate.

[0040]

[Table 1]

[0041]

EFFECTS OF THE INVENTION Since the present invention has such a constitution, it has high mechanical strength, excellent durability, and good light-shielding property.
A weeding sheet having a great weeding effect can be obtained.

[Brief description of drawings]

FIG. 1A is a plan view showing a weeding sheet of the present invention,
(B) is a vertical sectional view

FIG. 2 is a vertical sectional view showing another example of the weeding sheet of the present invention.

FIG. 3 is a perspective view showing an example of a uniaxially drawn yarn used for the weeding sheet of the present invention.

FIG. 4 is a longitudinal sectional view showing an example of a uniaxially drawn yarn used for the weeding sheet of the present invention.

FIG. 5 (A) is a perspective view showing an example of the weeding sheet of the present invention,
(B) and (C) are longitudinal sectional views.

FIG. 6 is a perspective view showing a state in which the weeding sheet of the present invention is laid.

[Explanation of symbols]

1: Weeding sheet 2: Uniaxially drawn yarn 3: Cloth 4: Thermoplastic resin sheet 5: Notch 6: Rib 7: Base layer 8: Surface layer 9: Different color yarn 10: Drainage material

Continued front page    F-term (reference) 2B024 DA02 DB04 DB07                 2B121 AA19 BB27 BB28 EA24 EA25                       EA26 FA12 FA16                 4H011 AB01 BC19 DA08 DH02

Claims (12)

[Claims] 1. A thermoplastic resin sheet is laminated on one side or both sides of a cloth-like body formed from a uniaxially stretched yarn formed by uniaxially stretching a synthetic resin, and has a light transmittance of less than 10%.
A weeding sheet comprising a cloth-like body having a mass of 50 to 500 g / m ² . 2. The weeding sheet according to claim 1, wherein the uniaxially drawn yarn comprises a flat yarn. 3. The uniaxially drawn yarn comprises a split yarn having a large number of small cuts formed in the longitudinal direction.
The weeding sheet described in. 4. The herbicidal sheet according to claim 1, wherein the uniaxially drawn yarn comprises a laminated flat yarn of different compositions. 5. The weeding sheet according to claim 1, wherein the surface of the weeding sheet is matt-treated. 6. The herbicidal sheet is colored.
The weeding sheet according to any one of 5 above. 7. The weeding sheet according to claim 1, wherein the longitudinal and transverse uniaxially drawn yarns of the cloth-like body are heat-sealed. 8. The weeding sheet according to claim 1, wherein a nonwoven fabric is laminated on the weeding sheet. 9. The weeding sheet according to claim 1, wherein uniaxially drawn yarns of different colors are woven into the cloth-like body at a predetermined interval. 10. The weeding sheet according to claim 1, wherein line marks are printed at predetermined intervals on the surface of the weeding sheet. 11. The weeding sheet according to claim 1, wherein a plurality of cloth-like bodies are laid with a predetermined overlap margin. 12. The weeding sheet according to claim 1, wherein the cloth-like body is locked with a synthetic resin pile material.