JP2003219782A - Soundproofing herbicidal sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soundproofing herbicidal sheet excellent in mechanical strength and durability, having low transmittance of light and high herbicidal effect and free from occurrence of sound caused by scattering of raindrops. <P>SOLUTION: The soundproofing herbicidal sheet comprises a multilayered cloth body obtained by superposing a soundproofing cloth-like body composed of a cloth body or a nonwoven fabric body formed by laterally crossing a uniaxially drawn yarn in a coarse state or a cloth body for soundproof on a light-blocking cloth body formed by laterally crossing a drawn yarn obtained by uniaxially drawing a thermoplastic synthetic resin and partially bonding the light-blocking cloth body to the cloth body for soundproof and having <10% light transmittance and 50-700 g/m<SP>2</SP>weight. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound deadening herbicidal sheet, and more particularly to a sound deadening herbicidal sheet which is excellent in strength and durability, has a high weeding effect, and produces little noise due to popping raindrops and the like.

[0002]

2. Description of the Related Art Conventionally, the slope of embankments such as river banks, field ridges, railroads, and roads is often washed away by sediment and its prevention has been an important issue. In addition, when weeds grow on slopes and the like, plants may suffer from pests, so frequent cutting or measures to prevent weed growth are required. 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).

However, various performances are required as a weeding sheet for laying such a sheet to prevent overgrowth of weeds, for example, mechanical strength is required to walk on it, and corrosion resistance is also required. It is necessary to have excellent durability and durability. Furthermore, in order to prevent weeds, it is required that the transmittance of light rays is low and that the reflection of sunlight does not adversely affect the environment.

Further, in order to provide a light-shielding property, when a sheet in which drawn yarns are densely woven or a weeding sheet in which thermoplastic synthetic resin sheets are laminated is laid, the weeding sheet is exposed to water such as rain. There is also the problem of popping and making noise. Therefore, it is also important to prevent noise caused by splashing of water droplets.

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

[0007]

DISCLOSURE OF THE INVENTION The present invention is excellent in mechanical strength and durability, has a low light ray transmittance, and therefore has a high weeding effect, and has a noise-reducing property that does not generate noise caused by popping raindrops. The purpose is to provide a weeding sheet.

[0008]

Means for Solving the Problems The present invention has been made as a result of earnest studies for achieving such an object. Specifically, a uniaxially stretched thermoplastic synthetic resin is stretched in a dense and longitudinal direction. On the light-shielding cloth formed by intersecting
A muffling cloth made of a cloth or a non-woven fabric formed by crossing uniaxially drawn drawn yarns in a rough state in the vertical and horizontal directions is overlapped, and the light-shielding cloth and the muffling cloth are partially bonded. The light transmittance is less than 10% and the mass is 50 to 700 g /
The present invention provides a sound deadening herbicidal sheet characterized by comprising a multi-layered fabric of m ² .

The present invention also provides the above-described sound deadening herbicidal sheet in which a flat yarn is used in at least a part of the drawn yarn, and a split yarn in which a large number of small cuts are formed in the longitudinal direction in at least a part of the drawn yarn. The present invention provides the above-mentioned sound deadening herbicidal sheet.

Further, the above-mentioned sound deadening herbicidal sheet, in which the light blocking cloth and the sound deadening cloth are partially joined so as to form a gap therebetween, the light blocking cloth and the sound deadening cloth. The above-mentioned sound deadening herbicidal sheet, which is joined with a hot melt agent,
The sound deadening herbicidal sheet in which the light shielding cloth and the sound deadening cloth are constructed by double weaving, and the sound deadening in which one or both of the light blocking cloth and the sound deadening cloth are colored. The present invention provides a sound-damaging herbicidal sheet, and the above-mentioned sound-damaging herbicidal sheet in which a thermoplastic resin sheet is laminated on at least one surface of a sound-deadening cloth-like body.

Further, the above-mentioned sound deadening herbicidal sheet and the sound deadening cloth body, which are prevented from fraying by heat-sealing the longitudinal and transverse stretched yarns of the cloth body, have different colors at predetermined intervals. The present invention provides the above weeding sheet in which uniaxially drawn yarn is woven, and the above weeding sheet in which line marks are printed on the surface of the weeding sheet at predetermined intervals.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The sound deadening and weeding sheet 1 of the present invention is
As shown in FIG. 1, a muffling cloth-like body 4 formed from drawn yarn 2 is superposed on a light-shielding cloth-like body 3 formed from drawn yarn 2 formed by uniaxially stretching a thermoplastic synthetic resin. And partially combined.

As the stretched yarn 2 forming the light-shielding cloth 3, a thermoplastic synthetic resin having an excellent stretching effect is used. Generally, high density polyethylene, linear low density polyethylene, ethylene / propylene copolymer is used. ,polypropylene,
Polyester, polyamide, etc. may be used alone or in appropriate combination.

In the present invention, the stretched yarn 2 constituting the light-shielding cloth-like body 3 broadly means a long object which can form the light-shielding cloth-like body 3, and is a multifilament, a spun yarn, a tape-like object, a string. It includes filaments such as strips, strips, and monofilaments, which may be twisted or untwisted.

The drawn yarn 2 may have any structure. For example, as shown in FIG. 3 (A), a thermoplastic synthetic resin film is slit into a predetermined width and uniaxially drawn to obtain a tape shape. It is also possible to use a split yarn in which a large number of cuts 5 and 5 are formed in a uniaxially stretched tape-shaped body as shown in FIG. 3 (B). Further, as shown in FIG. 3C, the tape-shaped body may be provided with extremely fine vertical ribs 6, 6, and by providing the ribs, the reflected light of the sun is scattered and the influence on the environment is reduced. be able to.

In addition, other shapes such as a round shape, an oblong shape, a square shape, a polygonal shape, and other irregular shapes can be formed. Further, a mixture of different resins is extruded into filaments, and the resins are divided to form fibrils. Suppleness can also be imparted by using the above-mentioned Dunline.

The uniaxially drawn drawn yarn 2 can be used alone or in a bundle of several.

The drawn yarn 2 may be a single layer of the base layer 7 as shown in FIG. 4 (A), and also, as shown in FIG. 4 (B) and FIG.
As shown in (C), the surface layer 8 can be formed on one side or both sides of the base layer 7, and the surface layer 8 can function as a bonding layer or a matting layer. Further surface layer 8
Is a sheath core structure as shown in FIG.
It is also possible to have a side-by-side structure as shown in (E).

When the drawn yarn 2 is provided with the surface layer 8, it can be made to function as a layer for joining the drawn yarns 2 after the drawn yarns 2 are made into a cloth shape. Examples of the thermoplastic synthetic resin used as the surface layer 8 functioning as a bonding layer include low-density polyethylene, high-density polyethylene, linear low-density polypropylene, polyolefin such as ethylene-propylene copolymer, polyethylene terephthalate, polybutylene terephthalate, and the like. Polyester, nylon 6, polyamide such as nylon 66 and the like can be mentioned, and a thermoplastic synthetic resin having a lower melting point than that of the base layer is selected in relation to the thermoplastic synthetic resin of the base layer 7.

Further, it is possible to add an inorganic filler to the drawn yarn 2. By adding the inorganic filler, it is possible to deluster and weaken the reflection of sunlight. 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 drawn yarn 2 or, as described above, may be added to the surface layer 8 forming the surface.

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

Specifically, antioxidants such as phenol-based and organic phosphite-based organic phosphorus-based and thioether-based antioxidants; hindered amine-based light stabilizers; benzophenone-based, benzotriazole-based, benzoate-based ultraviolet absorption, etc. Agents; nonionic, cationic, anionic, etc. antistatic agents; bisamide, wax, organometallic salt, etc. dispersants; amide, wax, organometallic salt, ester, etc. lubricants, bromine-containing Examples of the flame retardant include organic compounds, phosphoric acid compounds, antimony trioxide, magnesium hydroxide and red phosphorus.

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 are mixed in a known ratio by using a kneading device such as a conventionally known twin screw extruder, Banbury mixer, kneader mixing roll, etc., which may be melt-kneaded to prepare. A so-called masterbatch having a concentration may be prepared, and this may be diluted before use.

When a laminated body is used as the drawn yarn 2,
As a means for molding a laminated film which is a molding material for a laminated flat yarn or a laminated split yarn, a method known per se can be adopted, and a film to be a base layer 7 and a film to be a surface layer 8 are previously formed. By means of a dry laminating method or a thermal laminating method, a method of coating the surface of the film which becomes the base layer 7 with a thermoplastic synthetic resin which becomes the surface layer 8, and a surface of the film which becomes the base layer 7 formed in advance. It may be appropriately selected from known means such as a method of extrusion laminating the layer 8 or an extrusion molding as a laminated film by a multi-layer coextrusion method. In terms of adhesion, the base layer 7 is produced by the multi-layer coextrusion method.
A method of obtaining a laminate of the surface layer 8 and the surface layer 8 in one step is desirable. For the sheath core structure or the side-by-side structure, the coextrusion method is generally used.

As a stretching means, the film to be the base layer 7 may be uniaxially stretched, and then a thermoplastic synthetic resin to be the surface layer 8 may be laminated and slit into a tape. Before slitting the laminated film in which the base layer 7 and the surface layer 8 are laminated, or after slitting,
It can also be obtained by stretching in a uniaxial direction.

As the stretching operation, for example, a hot air circulating oven, a heat roll, a hot plate or the like is used to stretch in a single stage or in multiple stages of two or more stages in the pulling direction by 2.5 to 12.0 times. Further, a relaxation heat treatment of 0 to 30% is performed at a temperature of 60 to 160 ° C. using a hot air circulation type oven, a heat roll, a hot plate and the like. The draw ratio is usually about 3 to 10 times.

The thickness of the drawn yarn 2 is not limited and can be set arbitrarily according to the purpose, but generally,
500 to 10,000 decitex, preferably 1000
~ 5000 decitex, thread width 0.3 ~ 200mm,
The range is preferably 1.0 to 100 mm and the yarn thickness is 5 to 500 μm.

The drawn yarn 2 can be used as a woven fabric by weaving it as shown in FIG. 1. Further, as shown in FIG. It is also possible to use it as a sof by arranging the drawn yarns 2b in parallel and binding the intersections. It is also possible to intersect the drawn yarn 2 with the warp, the weft, and the naname and join the intersections.

The light-shielding cloth-like body 3 has a light-shielding property in order to obtain a weeding effect. As a method of imparting a light-shielding property to the cloth-like body, a light-reflecting powder such as aluminum powder or carbon black may be used for the drawn yarn 2 constituting the light-shielding cloth-like body 3.
This can be performed by adding a light-absorbing powder such as a pigment and weaving the drawn yarn 2 so that the drawn yarn 2 becomes dense, or by crossing the drawn yarn 2 into a cloth-like body.

In the present invention, the dense state of the drawn yarns 2 means a state in which the drawn yarns 2 constituting the warp and the weft have no gaps therebetween, or a state in which the drawn yarns 2 are formed into a cloth-like body in an extremely small state. The rough state of the drawn yarn 2 means a state in which there is a gap between the drawn yarns 2.

In the sound deadening herbicidal sheet 1 of the present invention, the sound deadening cloth 4 is superposed on the light shading cloth 3, and the light shading cloth 3 and the sound deadening cloth 4 are partially bonded. To be done. The muffling cloth body 4 can be configured by using a woven cloth in which the drawn yarns 2 are woven in a coarse state, a cloth-like body that is softened by crossing, or a non-woven fabric.

When the cloth-like body for sound deadening 4 is a cloth-like material which is woven or intersected and softened, the density of the drawn yarn 2 is higher than the density of the drawn yarn 2 of the light-shielding cloth-like body 3. Except for roughening, the light-shielding cloth-like body 3 has the same structure as that of the light-shielding cloth-like body 3, and the material resin, the molding method thereof, the structure of the drawn yarn 2, the structure of the cloth-like body, and the like are all light-shielding cloth-like bodies. It can be formed according to 3.

The distance between the drawn yarns 2 constituting the sound deadening cloth 4 is preferably 0.5 mm or more, more preferably 3 mm.
Woven or crossed to have a size of at least mm. Particularly preferably, the porosity represented by the following formula (1) is 10 to 80%, preferably 30 to 60%.

[0034]

[Equation 1]

As shown in FIG. 1, the light-shielding cloth-like body 3 and the sound-deadening cloth-like body 4 are bonded to each other by ethylene / vinyl acetate copolymerization as shown in FIG. A thermoplastic resin such as coalesced or other hot melt agent 11 can be used for joining. The joining structure can be arbitrarily selected to be linear, dot-shaped, or the like depending on the purpose, but it is common to adhere linearly at predetermined intervals.

The light-shielding cloth-like body 3 is formed by double weaving.
The muffling cloth-like body 4 can be woven at the same time in a partially joined state.

The light-shielding cloth-like body 3 and the sound-deadening cloth-like body 4 are joined so that the height of the hot-melting agent 11 is 0.5 to 10 mm, preferably 2 to 6 mm. It is desirable to have a gap between 3 and the muffling cloth 4.

It is desirable that the sound absorbing cloth 4 is colored by adding a pigment to the base layer 7 and / or the surface layer 8 constituting the drawn yarn 2, or both. Although the coloring color is not a limitation of the present invention, it is preferably a calm shade so as not to damage the environment, and is preferably black, green, brown or the like.

Further, as shown in FIGS. 1 and 2, the thermoplastic resin sheet 10 can be laminated on one side or both sides, preferably the lower surface of the light shielding cloth 3, and the thermoplastic resin sheet 10 can be laminated. By stacking the above, it is possible to prevent the laying surface of the weeding sheet 1 from being inundated by rainwater or the like and to shield the laying surface from water, so that the weeding effect can be enhanced. Further, the light shielding property can be enhanced by coloring the thermoplastic resin sheet 10. As the thermoplastic resin sheet 10, the thermoplastic resin as described above for the drawn yarn 2,
Polyolefin can be preferably used, and when the light-shielding property is imparted, the above-mentioned light-reflecting powder or light-absorbing powder added can be used.

As the thermoplastic resin sheet 10, a film-shaped body or a non-woven fabric can be used.

Further, to the thermoplastic resin constituting the thermoplastic resin sheet 10, other compounds may be added depending on the purpose, and an antioxidant, a light stabilizer, an ultraviolet absorber,
It is also possible to add plasticizers, antistatic dispersants, chlorine scavengers, lubricants, flame retardants, pigments, and the like.

In the present invention, the sound deadening herbicidal sheet 1 is a sheet having a light transmittance of less than 10% and a mass of 50 to 700 g / m 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 becomes difficult to secure the light-shielding property, and when the mass exceeds 700 g / m ² , the economical efficiency is deteriorated.

When a woven fabric or a non-woven fabric is used for the sound deadening herbicidal sheet 1, in order to prevent the fraying of the edges,
It is desirable to heat weld the ends by heat cutting with a hot blade, and it is also desirable to prevent fraying by tacking in.

Further, it is possible to prevent fraying by applying a molten thermoplastic resin, a hot-melting agent, or an aqueous adhesive to the cloth-like body. Lamination and application for preventing fraying are usually carried out by a predetermined method. It is performed linearly at intervals. Further, when a laminated body is used as the drawn yarn 2, it is possible to prevent fraying by heat welding.

Further, as shown in FIG. 5, it is preferable that the sound deadening herbicidal sheet 1 be woven with threads 12 of different colors at predetermined intervals. By weaving the yarns 12 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 provided by printing a line mark on the surface using printing ink.

Further, the sound deadening and weeding sheet 1 of the present invention comprises:
As shown in FIG. 6, a drainage material 13 such as a non-woven fabric is used as necessary.
It is also possible to attach.

The sound deadening weeding sheet 1 of the present invention is laid on a bank of a field, a bank of a river, an embankment slope of a railroad track, an embankment slope of a road, a road median strip, a lower part of a steel tower, etc. to perform a weeding function. be able to.

As shown in FIG. 7, the sound deadening herbicidal sheet 1 of the present invention is laid at a place to be weeded with an overlap margin,
It can be fixed by locking with the pile 14 or the like. As the pile 14, a ship nail-shaped body made of metal, thermoplastic synthetic resin, or the like, or a U-shaped body can be used.

The sound deadening herbicidal sheet 1 of the present invention is generally laid on the surface of a place to be weeded.
It is also possible to lay it as an underlaying material on a laying site such as a cobblestone.

[0050]

Examples (Example 1) A high density polyethylene (manufactured by Nippon Polychem) containing 1.0% by weight of a green pigment (cyanine green type) was used to form a film by an inflation molding method using a melt extruder. Slitted with leather. The slit resin tape has a temperature of 110
After stretching 7 times on a hot plate of ~ 120 ° C, 6% relaxation heat treatment is performed in a hot air circulation type oven at a temperature of 120 degrees,
I wound it up on a winder. The obtained drawn tape has a single yarn fineness of 1900 decitex and a yarn width of 8 mm, and is folded so that a folding line is formed in the longitudinal direction for 2-3
It was rolled up to have a width of mm.

Using the obtained stretched tape, a woven fabric having 14 × 14 vertical and horizontal driving lines was formed to obtain a dense stretched tape woven fabric. Similarly, the stretched tape obtained above was used to weave 6 × 6 vertical and horizontal stitches to form a woven fabric having a coarse stretched tape.

On a woven fabric where the drawn tape is dense, a diameter of 5
mm of ethylene-vinyl acetate copolymer was extruded at intervals of 20 cm, a woven cloth having rough stretched tape was laid on it, and lightly pressed to join the three to obtain a sound deadening herbicidal sheet. .

The obtained double-layered silencing herbicidal sheet (fruit
Example 1), a high-density polyethylene with a thickness of 60 μm on the back surface
A sound deadening herbicidal sheet laminated with Ren (manufactured by Nippon Polychem)
(Example 2) A woven cloth having a rough laminated sheet stretched tape
Laminated sheet of dense woven fabric of the above-mentioned stretched tape not having
(Comparative Example 1) and 6 to the dense woven fabric of the above-mentioned stretched tape
High-density polyethylene with a thickness of 0 μm (Japan Polychem
Weeding sheet with only laminated sheets (comparative example)
2) is laid and a height of 2 m above it is 20 L / m ²m
The amount of noise generated by spraying in water in the form of rain is
Evaluated by rank. The results are shown in Table 1.

A: Almost no sound of water drops B: You can hear the sound of water drops, but there is no noise. C: Water drops hit the sheet, and the sound of the water drops popping is noisy

[0055]

[Table 1]

[0056]

EFFECTS OF THE INVENTION Since the present invention has such a constitution, it has a high mechanical strength, an excellent durability, a good light-shielding property and an excellent weeding property, and a noise-eliminating weeding sheet free from noise caused by raindrops splashing. can get.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a sound deadening weeding sheet of the present invention.

FIG. 2 is a vertical cross-sectional view showing another example of the light-shielding cloth-like body.

FIG. 3 is a perspective view showing an example of a drawn yarn used in the sound deadening and weeding sheet of the present invention.

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

FIG. 5 is a perspective view showing an example of the sound deadening and weeding sheet of the present invention.

FIG. 6 is a longitudinal sectional view showing another example of the sound deadening and weeding sheet of the present invention.

FIG. 7 is a perspective view showing an example of laying the sound deadening and weeding sheet of the present invention.

[Explanation of symbols]

1: Silent weeding sheet 2: Stretched yarn 3: Light-blocking cloth 4: Sound-absorbing cloth 5: Notch 6: Rib 7: Base layer 8: Surface layer 10: Thermoplastic resin sheet 11: Hot melt agent 12: Different color threads 13: Drainage material 14: Pile

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2B024 DA02 DA03 DB04 DB07                 2B121 AA19 BB28 EA21 FA12                 4F100 AK01A AK01C AK01D AK05                       BA02 BA03 BA04 BA07 BA10A                       BA10B BA10C BA32 DG11A                       DG11B DG15B EJ37A EJ37B                       GB01 JB16A JB16C JB16D                       JH01 JH01B JK01 JL00                       JL10A JL10B JN02 JN02A

Claims (11)

[Claims] 1. A uniaxially stretched drawn yarn is crossed in a coarse state in a vertical and horizontal direction on a light-shielding cloth formed by uniaxially stretched drawn thermoplastic synthetic resin in a dense state in a crosswise manner. Sound-absorbing cloths made of a cloth-like body or a non-woven fabric formed as described above are partially overlapped with each other, and the light-shielding cloth-like body and the sound-deadening cloth-like body are partially bonded, and the light transmittance is less than 10% and the mass is 50. ~ 700g
A sound deadening herbicidal sheet, which is made of a multi-layered cloth body having a thickness of / m ² . 2. The sound deadening herbicidal sheet according to claim 1, wherein a flat yarn is used for at least a part of the drawn yarn. 3. The sound deadening herbicidal sheet according to claim 1, wherein a split yarn having a large number of small cuts in the longitudinal direction is used for at least a part of the drawn yarn. 4. The light-shielding cloth-like body and the sound-deadening cloth-like body are partially joined so as to form a gap therebetween.
The sound deadening herbicidal sheet according to any one of 1. 5. The sound deadening herbicidal sheet according to claim 1, wherein the light shielding cloth and the sound deadening cloth are joined together with a hot melt agent. 6. The sound deadening herbicidal sheet according to any one of claims 1 to 4, wherein the light-shielding cloth and the sound deadening cloth are made of a double weave. 7. The sound deadening herbicidal sheet according to claim 1, wherein one or both of the light blocking cloth and the sound deadening cloth are colored. 8. The sound deadening herbicidal sheet according to any one of claims 1 to 7, wherein a thermoplastic resin sheet is laminated on at least one surface of the light shielding cloth. 9. The sound deadening herbicidal sheet according to any one of claims 1 to 7, wherein the longitudinal and transverse stretched yarns of the cloth-like body are heat-fused to prevent fraying. 10. A uniaxially drawn yarn of different colors is woven at a predetermined interval in a muffling cloth-like body.
The weeding sheet according to any one of 1. 11. The weeding sheet according to claim 1, wherein line marks are printed at predetermined intervals on the surface of the weeding sheet.