JP2002272348A - Weed proofing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weed proofing sheet having shading property used for inhibiting growth of weeds on a ground, surface, especially a slope of a road, a railroad, a river, a park or an afforestation garden and their circumference. SOLUTION: This weed proofing sheet is obtained by laminating (a) a surface layer selected from inorganic particles and a synthetic resin including the inorganic particles, (b) a modified asphalt layer and (c) a base material layer, and the base material layer (c) comprises a base material selected from a woven fabric, a knit fabric and a nonwoven fabric, and the base material comprises a fiber selected from (1) a fiber having melting point of >=200 deg.C and (2) a fiber having sheath-core structure comprising a sheath part composed of a resin having melting point of >=200 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grass sheet having a light-shielding property for preventing the growth of grass on the ground, the surface, particularly the slope, such as roads, railroads, rivers, parks, or plantations and their surroundings. .

[0002]

2. Description of the Related Art Japanese Utility Model Application Laid-Open No. 56-83027 discloses a sheet in which a synthetic resin nonwoven fabric having an appropriate thickness as a reinforcing waterproof material is impregnated with asphalt on one side of a synthetic resin material film 1 such as polyethylene, polypropylene, vinyl chloride or the like. 2, a waterproof / weedproof sheet made of three layers of dissimilar materials by adhering a water-permeable synthetic resin sheet 3 of appropriate thickness to the other surface.

[0003] JP-A-6-56606 discloses 10d
Consisting of a woven fabric using synthetic fiber yarns of ~ 250d,
The average area of the fine holes formed in the warp and weft gaps is 70
0 μm²More than 2000 μm²The micropores
Is 500 pieces / cm²Above and above and water permeable
Coefficient is 10 ^-3-10^-4cm / sec.
A herbicidal sheet is disclosed.

Japanese Patent Application Laid-Open No. Hei 8-291523 discloses a grounded backside protective layer formed of a soft polyvinyl chloride resin containing a solid plasticizer and not containing a liquid plasticizer, and a ground backside protective layer formed on the grounded backside protective layer. A formed intermediate layer, and an outermost surface layer formed on the intermediate layer and made of a weather-resistant material,
Wherein the intermediate layer has at least one weed growth preventing layer containing a fiber cloth, and at least one intermediate shielding layer laminated and united with the weed growth preventing layer and formed of a soft polyvinyl chloride resin. The fibrous fabric in the weed growth prevention layer including an aqueous layer, in the warp direction and the weft direction,
Disclosed is a ground surface protection sheet having a penetration resistance of 10 kgf or more and a porosity of 60% or less.

[0005] Japanese Patent Application Laid-Open No. 9-99980 discloses a laminated sheet in which a light-shielding film made of a synthetic resin, which hardly transmits light, is laminated on at least one surface of a reinforcing sheet made of a nonwoven fabric, a woven fabric, or the like. A weed control sheet is disclosed.

Japanese Patent Application Laid-Open No. 10-42720 discloses a woven fabric densely woven from a flat yarn having a single-fiber fineness of 500 to 2,000 denier formed from a polyolefin resin containing carbon black and having a light-shielding rate of 90%
As described above, the water permeability is 50 to 300 g / m ² · hr, the tensile strength is 100 kgf / 5 cm or more, and the tear strength is 20 kg.
Disclosed is a herbicidal sheet of f or more.

[0007] Japanese Patent Application Laid-Open No. 10-168730 discloses a nonwoven fabric containing asphalt and JIS.
A water-permeable nonwoven fabric sheet having a penetration resistance of 80 kgf or more when measured based on the constant-speed stretching method of L-1096 is disclosed.

[0008] JP-A-10-266155 discloses that
(A) a surface layer made of inorganic particles, (b) a modified asphalt layer, (c) a base material layer that is not penetrated even by grass growth, (d) a modified asphalt layer, (e) a synthetic resin or A ground-slope-weed-protecting sheet comprising a back layer selected from the group consisting of a rubber film layer and an inorganic particle layer, wherein the base material layer (c) is formed of a woven or nonwoven fabric with rubber and synthetic resin. A woven or nonwoven fabric laminated on both sides of a self-supporting film having a melting point of 200 ° C. or higher selected from the group consisting of synthetic resin and rubber; And a ground-slope weed protection sheet characterized by being selected from the group consisting of:

[0009] Japanese Patent Application Laid-Open No. 11-81219 discloses that the water permeability of a laminate having a thickness of 5 cm is 1 × 10 ⁻³ cm / s.
water-repellent granules having an ec or more and penetration resistance of 1 kg
A water-permeable weed-proof structure characterized by being a laminated structure with the above fiber structure is disclosed.

[0010] JP-A-2000-279036 discloses that
A weed prevention sheet for laying on the surface of soil to prevent the growth of weeds, which is a sheet made of an elastomer material. The sheet has a thickness of 0.8 to 3.0 mm and the sheet thickness [mm]. A herbicidal sheet is disclosed, wherein a value obtained by multiplying by 300% modulus [MPa] is 9.0 or more.

Japanese Utility Model Registration No. 3074880 discloses that a mat made of entangled fibers prepared by needle punching is superimposed on one or both sides with a fabric which is resistant to breaking up of weeds having strong elongation. A grass-proof mat characterized by the above is disclosed.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a light-shielding weed control which prevents the growth of grass on the ground, on the surface, especially on the slope, such as roads, railway tracks, rivers, parks or afforestation gardens, and around them. The purpose is to provide seats.

[0013]

According to the present invention, at least three of (a) a surface layer selected from inorganic particles and a synthetic resin containing inorganic particles, (b) a modified asphalt layer, and (c) a base material layer. A grass sheet laminated with layers,
(C) The base material layer is a base material selected from a woven fabric, a knitted fabric and a nonwoven fabric, and the woven fabric, the knitted fabric and the nonwoven fabric have a melting point of 2
The present invention relates to a herbicidal sheet characterized by comprising a fiber having a core temperature of 200 ° C. or higher and a fiber having a core and a sheath having a melting point of 200 ° C. or higher.

Preferably, the present invention provides (a) a surface layer selected from inorganic particles and a synthetic resin containing inorganic particles, (b) a modified asphalt layer, (c) a base material layer, and (d)
(C) a base material layer comprising: a modified asphalt layer; and (e) a base layer, wherein at least five layers are laminated with a back layer selected from a synthetic resin, rubber, inorganic particles, and a synthetic resin containing inorganic particles. Is a substrate selected from woven, knitted and nonwoven fabrics, and woven, knitted and nonwoven fabrics are
Fibers and sheaths with a melting point of 200 ° C or higher
The present invention relates to a herbicidal sheet comprising fibers selected from fibers having a core-sheath structure made of a resin.

Preferably, in the present invention, the base material layer (c) is a base material selected from a woven fabric, a knitted fabric and a nonwoven fabric. The sheath portion is made of fibers selected from fibers having a core-sheath structure made of a resin having a melting point of 200 ° C. or more, and a part of the fibers is bonded by a resin selected from a resin having a melting point of 200 ° C. or more and an adhesive that does not thermally decompose at 200 ° C. Or the above-mentioned weedproof sheet, wherein a part of the fiber is heat-sealed.

Preferably, the present invention relates to the above herbicidal sheet, wherein (c) the base material layer further has a scrim made of fibers having a melting point of 200 ° C. or more.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The weed control sheet of the present invention comprises (a) a surface layer selected from inorganic particles and a synthetic resin containing inorganic particles, (b) a modified asphalt layer, and (c)
A grass sheet having at least three layers laminated with a substrate layer, wherein (c) the substrate layer is a substrate selected from a woven fabric, a knitted fabric and a nonwoven fabric, and the woven fabric, the knitted fabric and / or the nonwoven fabric Has a melting point of not less than 20 ° C.
A grass sheet comprising a fiber selected from fibers having a core-sheath structure of a resin at 0 ° C. or higher.

Preferably, the weed control sheet of the present invention comprises (a)
A surface layer selected from inorganic particles and a synthetic resin containing the inorganic particles, (b) a modified asphalt layer, (c) a base layer, (d) a modified asphalt layer, and (e) a synthetic resin, rubber, and inorganic particles. And a back layer selected from a synthetic resin containing inorganic particles and at least five layers, wherein (c) the base material layer is a base material selected from a woven fabric, a knitted fabric and a nonwoven fabric. A woven fabric, a knitted fabric, and / or a nonwoven fabric, wherein the herbaceous sheet comprises fibers selected from fibers having a melting point of 200 ° C. or more and fibers having a sheath having a core-sheath structure composed of a resin having a melting point of 200 ° C. or more. preferable.

In the grass sheet of the present invention, the base layer (c) is a base material selected from a woven fabric, a knitted fabric and a nonwoven fabric.
A fiber having a melting point of 200 ° C. or more and a core-sheath structure made of a resin having a melting point of 200 ° C. or more, and a part of the fiber is formed of a resin having a melting point of 200 ° C. or more and an adhesive that does not thermally decompose at 200 ° C. It is preferred that the fibers are bonded by a selected resin and / or that a part of the fibers is heat-sealed.

In the grass sheet of the present invention, the base layer (c) preferably further has a scrim made of fibers having a melting point of 200 ° C. or higher. The scrim is
It means a plain woven or twill woven fabric, and the fiber and / or yarn spacing is preferably 3 mm or more, more preferably 4 mm or more, and more preferably 5 mm or more.
Particularly preferably, a woven fabric of 7 mm or more is preferable.

(C) The substrate layer may be a substrate selected from woven, knitted and nonwoven fabrics, and may be a combination of two or more woven, knitted or nonwoven fabrics. (C) The base material layer is partially bonded with an adhesive and / or resin that does not thermally decompose at 200 ° C., such as a woven fabric, a knitted fabric, or a nonwoven fabric, which is partially bonded with a resin having a melting point of 200 ° C. or higher. It is preferable to use a woven fabric, a knitted fabric, a nonwoven fabric, etc., which are partially heat-sealed, such as a woven fabric, a knitted fabric, and a nonwoven fabric. As the woven fabric, the knitted fabric and the nonwoven fabric, those composed of natural, semi-synthetic and synthetic resin fibers having a melting point of 200 ° C. or more, organic fibers and inorganic fibers such as organic or inorganic glass having a melting point of 200 ° C. or more are used. be able to.

As a resin having a melting point of 200 ° C. or higher, a melting point of 2
Any resin, natural or synthetic, having a melting point of 200 ° C. or higher can be used, particularly, polyamide, polycarbonate, polyphenylene oxide, polyether sulfone, polyamide imide, polyester imide, polyimide, polysulfone, or polyether having a melting point of 200 ° C. or higher. For example, a fiber made of a resin such as a resin can be used. Particularly, nylon 11 or nylon 12 having low water absorption is preferable. As the resin having a melting point of 200 ° C. or more, partially crosslinked or crosslinked rubber can be used. As the fiber having a melting point of 200 ° C. or more, a fiber made of a resin having a melting point of 200 ° C. or more, or a fiber containing a resin having a melting point of 200 ° C. or more;
Organic fibers or inorganic fibers having a temperature of 00 ° C. or higher can be used.

The term "fiber" means a single fiber, two or more fibers, a bundle of two or more fibers, and a fiber (yarn) crossed by two or more fibers.

A fiber having a core-sheath structure is one component (sheath portion)
Is at least 50% of the other component (core), and 70%
As mentioned above, it means a fiber having a fiber structure in a state of covering at least 90% of the surface. In particular, the fiber having a core-sheath structure preferably means a fiber having a fiber structure in which one component (sheath portion) completely covers another component (core portion). The core is preferably made of a low-water-absorbing synthetic resin or inorganic material because of its excellent long-term stability. For the core, a synthetic resin or inorganic substance having a water absorption (24 hours, 23 ° C.) of preferably 1% or less, more preferably 0.9% or less, and particularly preferably less than 0.8% can be preferably used. The core is nylon 1 with low water absorption
It is preferable to use a synthetic resin or an inorganic material such as No. 1, nylon 12, polyester or glass.

(A) The inorganic particles in the surface layer and the inorganic particles contained in the synthetic resin include natural slate sand, silica, silica sand, zeolite, mica, talc, clay, alumina, calcium carbonate, diatomaceous earth, and the like. Such as pulverized products can be used. The particle size of the inorganic particles may be any as long as there is no problem in use, preferably 0.05 to 1 mm, more preferably 0.07 mm.
To 0.9 mm, particularly preferably 0.1 to 0.7 mm. As the inorganic particles, those obtained by adding, spraying, applying or impregnating a water repellent, a paint, a pigment, a thickener, a light-proofing agent, a weathering agent, and the like as necessary can be used.

(A) In the surface layer, a synthetic resin containing inorganic particles is used as a coating film, sheet, or film by, for example, laminating, coating, spraying, or impregnating the modified asphalt layer. Can be. As the synthetic resin containing inorganic particles, a resin containing inorganic particles and a synthetic resin paint can be used. The synthetic resin containing the inorganic particles is used in an amount of 3 to 250 parts by weight, more preferably 5 to 200 parts by weight, based on 100 parts by weight of the synthetic resin paint.
It is preferable to use one containing 10 parts by weight, particularly 10 to 180 parts by weight. Synthetic resin containing inorganic particles,
It is preferable to add a water repellent, a pigment, a thickener, a light-proof agent, a weather-resistant agent, and the like as needed. Any amount of the synthetic resin containing the inorganic particles can be used, but preferably 20 to 100 g / m ² , more preferably 40 to 95 g / m ² , and particularly preferably 50 to 90 g / m ² .
A range of m ² is preferred.

(A) Polyolefins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid derivatives, polyurethanes, polyesters, polycarbonates, etc.
Polyphenylene oxide, polysulfone, polyether sulfone, polyamide imide, polyester imide, polyamide, acrylic resin, polybutadiene, styrene
Copolymers of olefin polymers having two or more double bonds in the main chain, such as butadiene copolymers, vinyl polymers, and olefins having two or more double bonds in the main chain and olefins having one double bond in the main chain. A polymer or the like can be used. It is preferable to use a synthetic resin having excellent weather resistance. It is preferable to use a synthetic resin having excellent light resistance. It is preferable to use a synthetic resin having excellent flexibility.

(A) In the surface layer, as the synthetic resin paint, polyurethane, acrylic resin, ethylene-vinyl acetate copolymer, polyester, polyamide, polyimide, polybutadiene, styrene-butadiene copolymer and the like can be used. It is preferable to use a synthetic resin paint having excellent weather resistance. It is preferable to use a synthetic resin paint having excellent flexibility. In particular, as a synthetic resin paint, methyl acrylate,
A polymer of at least one monomer selected from acrylates and methacrylates such as ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate and butyl methacrylate, or at least one monomer selected from ethylene and Copolymers with other vinyl monomers such as α-olefins and styrene are preferred.

The modified asphalt for the layers (b) and (d) includes those containing asphalt and a polymer,
A material containing three components of asphalt, a polymer and an inorganic filler can be used. Asphalt 1 as the modified asphalt for the layers (b) and (d)
It is preferable to use one containing 10 to 40 parts by weight of a polymer and 0 to 20 parts by weight of an inorganic filler with respect to 00 parts by weight. Modified asphalts include those containing asphalt and polymer, those containing three components of asphalt, polymer and inorganic filler, and the like.
It is preferable to use those prepared by heating and mixing for 30 hours because they are excellent in waterproofness, moistureproofness, elasticity and the like. In addition to the above-mentioned components, modified asphalt includes water repellents, pigments, thickeners, light stabilizers, weathering agents, etc., which are generally used in compounding synthetic resins and rubbers, such as process oil, vaseline, ceresin, and petroleum resins. You may add inorganic or organic compounding agents, such as.

In the modified asphalt of the layer (b) and the layer (d), asphalt may be a naturally occurring one such as natural asphalt or asphaltite, a petroleum asphalt such as straight asphalt, blown asphalt, cutback asphalt, or the like. And the like of asphalt.

In the modified asphalt of the layers (b) and (d), the polymer may be natural rubber, synthetic rubber,
Mixture of natural rubber and synthetic rubber, polyethylene, ethylene-vinyl acetate copolymer, copolymer of ethylene and acrylic acid derivative, polypropylene, polybutene-1, poly-4
-Methylpentene-1, polystyrene, acrylonitrile / styrene copolymer, ABS resin, polyvinyl chloride,
Polyacrylonitrile, a polymer of styrene and butadiene (eg, SBS, SBR, etc.) and the like can be used. In particular, rubbers such as SBS are suitable.

In the modified asphalt of the layers (b) and (d), inorganic fillers such as calcium carbonate, magnesium silicate, calcium silicate, aluminum silicate, silicic anhydride, clay, carbon black, talc, A particulate inorganic filler such as mica, barium sulfate, diatomaceous earth, or silica, or a fibrous inorganic filler such as asbestos or glass fiber can be used.

The modified asphalt of the layers (b) and (d) has a penetration of preferably 10 to 200 dmm.
Range, more preferably in the range of 15 dmm to 100 dmm, more preferably in the range of 20 dmm to 50 dmm,
Particularly preferably, the range of 25 dmm to 35 dmm is preferable because of excellent flexibility.

(E) The back surface layer is a layer selected from a synthetic resin, rubber, inorganic particles and a synthetic resin containing inorganic particles. (E) As the back surface layer, one or more, more preferably two or more, of synthetic resins, rubbers, inorganic particles and synthetic resins containing inorganic particles can be used in combination. (E) In the back layer, a synthetic resin, rubber, a synthetic resin containing inorganic particles and / or inorganic particles,
It can be used as a coating film by application, spraying, impregnation or the like, or as a sheet or a film, and extruded and laminated in a solution state. (E) The inorganic particles of the back layer and the synthetic resin containing the inorganic particles include (a)
Inorganic particles used for the surface layer and synthetic resins containing the inorganic particles can be used.

(E) The synthetic resin for the back layer is made of an α-olefin (co) polymer having 2 to 10 carbon atoms, such as polyethylene or polypropylene, an ethylene-vinyl acetate copolymer, or a copolymer of ethylene and an acrylic acid derivative. Use polyolefins such as polymers, polyurethanes, acrylic resins, polyesters, polycarbonates, polyphenylene oxides, polysulfones, polyethersulfones, polyamideimides, polyesterimides, polyamides, polyimides, polyvinylhalides such as polyvinyl chloride and polyvinylidene chloride, and the like. I can do it. It is preferable to use a synthetic resin having excellent light resistance. It is preferable to use a synthetic resin having excellent weather resistance. It is preferable to use a synthetic resin having excellent flexibility.

As the rubber, a thermoplastic low-crystalline elastomer having no definite yield point or a thermoplastic amorphous elastomer having no definite melting point and yield point, and an elastomer having rubber elasticity at room temperature can be used. Can be used. Thermoplastic elastomers such as styrene-based elastomers, olefin-based elastomers, polyester-based elastomers, and polyamide-based elastomers can be used.

Examples of the styrene elastomer include a styrene-butadiene-styrene copolymer (such as SBS) and a hydrogenated styrene-butadiene-styrene copolymer (SEBS).
Styrene-butadiene copolymer (HSBR)
Butadiene such as hydrogenated styrene-butadiene-olefin crystal block copolymer (such as SEBC).
Styrene copolymers (including all random copolymers, block copolymers, graft copolymers, etc.) and their hydrogenated products, hydrogenated styrene-isoprene copolymers (such as SEP), hydrogenated styrene-vinyl isoprene The copolymer (V-
Isoprene-styrene copolymers such as styrene-isoprene-styrene copolymer (such as SIS) and hydrogenated styrene-isoprene-styrene copolymer (such as SEPS) (random copolymer, block copolymer,
Graft copolymers and the like) and its hydrogenated products.

As the polyolefin-based elastomer,
An amorphous or low-crystalline α-olefin (co) polymer such as amorphous polypropylene, a mixture of a polyolefin and an olefin rubber, or the like can be used. As the polyolefin-based elastomer, an ethylene-propylene-based elastomer (such as EPR) and an ethylene / butene-based elastomer (such as EBM) can be used. As the polyester-based elastomer, a polyester-polyether copolymer and a polyester-polyester copolymer can be used. An elastomer made of a polymer or the like can be used. As the polyamide-based elastomer, an elastomer composed of a polyamide-polyester copolymer, a polyamide-polyether copolymer, or the like can be used. Two or more of the above elastomers may be used as a mixture.

(E) As the rubber for the back surface layer, polybutadiene, styrene-butadiene copolymer, polyisobutylene, chloroprene rubber, nitrile rubber and the like can be used.

(C) In the base material layer, a part of fibers of woven fabric, knitted fabric and non-woven fabric is bonded by a resin selected from a resin having a melting point of 200 ° C. or more and an adhesive which does not thermally decompose at 200 ° C. Preferably, it is worn.
As the adhesive that does not thermally decompose at 200 ° C., an inorganic adhesive or an organic adhesive that does not thermally decompose at 200 ° C. can be used. As an adhesive that does not thermally decompose at 200 ° C,
For example, urethane adhesive, acrylic adhesive, polyamide adhesive, epoxy adhesive, polyester adhesive, nylon / epoxy adhesive, elastomer / epoxy adhesive, nitrile / phenolic adhesive, urethane / Epoxy adhesive, polyester / epoxy adhesive, polyisocyanate adhesive, polyethyleneimine adhesive, melamine adhesive, urea adhesive, phenol adhesive, polychloroprene adhesive, nitrile rubber adhesive An adhesive that does not thermally decompose at 200 ° C., such as a recycled rubber adhesive, an SBR adhesive, or a natural rubber adhesive, can be used.

(C) In the base material layer, an adhesive that does not thermally decompose at 200 ° C. is defined as a thermogravimetric analysis in air at 5 ° C.
Per minute at 200 ° C.
% Or less, more preferably 0.5% or less, particularly 0%, of a natural or synthetic resin. As an adhesive that does not thermally decompose at 200 ° C., it is preferable to use a crosslinkable natural or synthetic resin such as an epoxy resin or (a) a synthetic resin paint for the surface layer.

The light transmittance of the herbicidal sheet of the present invention is preferably 10% or less, more preferably 5% or less, and particularly preferably 0%. When the light transmittance is within the above range, it is preferable because the growth of weeds can be effectively prevented.

The penetration resistance of the grass sheet of the present invention is preferably 100 N or more, more preferably 150 N or more, more preferably 200 N or more, and particularly preferably 250 N or more. When the penetration resistance is in the above range, it is preferable because the growth of weeds can be effectively prevented.

The tensile strength of the herbicidal sheet of the present invention is preferably 20 N / cm or more, more preferably 50 N / cm.
Or more, more preferably 80 N / cm or more, more preferably 100 N / cm or more, particularly preferably 110 N / cm.
The above is preferred. Within the above range, the handleability during construction is excellent and the durability is excellent. Further, it is preferable because of excellent continuous productivity.

The tensile elongation of the herbicidal sheet of the present invention is preferably 15% or more, more preferably 30% or more, and particularly preferably 40% or more. In the above-mentioned range, the base material is adapted to the unevenness of the ground with appropriate flexibility, so that the handleability during construction is excellent and the durability is excellent. Further, it is preferable because of excellent continuous productivity.

The tear strength of the herbicidal sheet of the present invention is preferably at least 20 N, more preferably at least 40 N, more preferably at least 60 N / cm, particularly preferably at least 70 N / cm.
cm or more is preferred. Within the above range, the handleability and fixability during construction are excellent, and the durability is excellent. Further, it is preferable because of excellent continuous productivity.

The grass sheet of the present invention preferably has a thickness in the range of 1 mm to 10 mm, more preferably 1.5 mm.
A range of from 8 mm to 8 mm, particularly preferably a range of from 2 mm to 6 mm, is preferable because of easy handling.

The weed control sheet of the present invention has a tensile strength and / or
Or, the ratio of the length to width of the tear strength, or the ratio of the length direction to the width direction at the time of manufacture is preferably in the range of 0.8 to 1.25, and more preferably in the range of 0.84 to 1.20. It is more preferably in the range of 0.86 to 1.16, particularly preferably in the range of 0.88 to 1.14, in order to have uniform herbicidal properties.

In the present invention, the term "slope" refers to a slope formed by roads, railroad tracks and their surroundings, a slope formed by cutting, embankment, etc., a slope between two ground surfaces having a step, and a slope between two ground surfaces. Slope, between two ground surfaces, etc.

[0050]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited thereby.

(Evaluation of Laminated Sheet) Tensile strength, tensile elongation, tear strength: JIS A60
According to No. 13, a universal material testing machine [UTM-10T manufactured by Orientec Co., Ltd.] was used, and a pulling speed of 100 mm was used.
/ Min, the sample width was 50 mm, the distance between the chucks was 100 mm, and the test temperature was 22 ° C. The uniaxial tensile strength was measured.

2. Penetration resistance: Performed in accordance with ASTM D4833. As shown in FIGS. 2 (A) and 2 (B), the penetration resistance of the grass sheet is expanded and fixed as shown in FIG. 2 (C) using a measuring terminal 6 having a tip 7 at the lower end. The resistance force when the measuring terminal 6 penetrated the herbicidal sheet 8 was measured at a penetration speed of 300 mm / min and a test temperature of 22 ° C.

(Example) Width 1000 mm to 1050 mm
Composite nonwoven fabric (AKZO NOBEL, product name: c
olback; cultivar: SNS125, sheath core structure, sheath part:
Nylon, core: polyester, scrim: glass fiber) were passed through modified asphalt obtained by heating and melting at 170 ° C. to 200 ° C. to form a three-layer sheet having a non-woven fabric provided with modified asphalt layers on both surfaces. . Here, product name: colback-type: SNS125 (AKZO
NOBEL Co., Ltd.) is obtained by integrally forming a nonwoven fabric made of a fiber having a sheath-core structure (sheath portion: nylon, core portion: polyester; PET) and a scrim of glass fiber by heat-sealing nylon of the sheath portion. . Modified asphalt is AP
A P modification type penetration of 29 dmm was used.

On one side (front side) of the modified asphalt layer of the three-layer sheet, 500 g / m ^{2 to} 2000 g of No. 3 to 5 silica sand was used.
g / m ² , and a polyethylene film was adhered to the other surface (back side) to form a 3.2 mm-thick 5-layer sheet, which was wound around a cardboard core to obtain a laminated sheet. . Laminated sheets could be produced continuously. The obtained laminated sheet was evaluated for tensile strength and the like, and the results are shown in Table 1. The light transmittance of the laminated sheet was 0%, and no light was transmitted.

[0055]

[Table 1]

[0056]

According to the present invention, grounds, surfaces, such as roads, railway tracks, rivers, parks, or plantations and their surroundings,
In particular, it is possible to provide a herbicidal sheet having a light-shielding property for preventing the growth of grass on a slope. In the grass sheet of the present invention, by using the base layer having the scrim, the tear strength and the tensile strength are excellent, and the dimensional stability is excellent.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a grass sheet of the present invention.

FIG. 2 is an explanatory view of a penetration test of a grass-proof sheet, FIG. 2 (A): penetration resistance measuring device diagram, FIG. 2 (B): cross-sectional view of a measuring terminal, FIG. 2 (C): using a measuring terminal 2 shows a penetration state diagram in which a penetration test was performed on the weed prevention sheet.

[Explanation of symbols]

 1: Surface layer (inorganic particles), 2: Modified asphalt layer, 3: Base layer, 4: Modified asphalt layer, 5: Backside layer, 6: Terminal for measurement, 7: Tip of terminal for measurement, 8 , 10: Weed-proof sheet.

Continued on the front page F term (reference) 2B024 AA10 DB01 DB03 DB04 2B121 AA19 BB28 EA24 FA12 4F100 AA00A AA00E AA00H AG00 AK01A AK01E AK41 AK46 AL06B AL06D AM00B AM00D AN00E BA03 BA05 BA10A BA10C BA10E BA10C BA10E BAC JA04C JJ03G JL00 JN02 YY00C

Claims (4)

[Claims] 1. A herbicidal sheet comprising (a) a surface layer selected from inorganic particles and a synthetic resin containing inorganic particles, (b) a modified asphalt layer, and (c) a base material layer laminated with at least three layers. (C) The base material layer is a base material selected from a woven fabric, a knitted fabric and a nonwoven fabric, and the woven fabric, the knitted fabric and the nonwoven fabric have a fiber and a sheath having a melting point of 200 ° C or more and a melting point of 200 ° C or more. A grass sheet comprising a fiber selected from fibers having a core-sheath structure made of a resin. 2. A surface layer selected from (a) an inorganic particle and a synthetic resin containing the inorganic particle, (b) a modified asphalt layer, (c) a base layer, (d) a modified asphalt layer, and (e). A) a herbicidal sheet in which at least five layers are laminated with a back layer selected from a synthetic resin, rubber, inorganic particles and a synthetic resin containing inorganic particles, wherein (c) the base material layer is a woven fabric, a knitted fabric, A base material selected from nonwoven fabrics, wherein a woven fabric, a knitted fabric, and a nonwoven fabric are made of fibers selected from fibers having a melting point of 200 ° C. or higher and fibers having a sheath having a core and sheath structure having a melting point of 200 ° C. or higher. And weed prevention sheet. (C) the base material layer is a base material selected from a woven fabric, a knitted fabric and a non-woven fabric;
It is made of a fiber selected from fibers having a core-sheath structure made of a resin of 0 ° C. or more, and a part of the fibers is bonded by a resin selected from a resin having a melting point of 200 ° C. or more and an adhesive that does not thermally decompose at 200 ° C. or The grass sheet according to claim 1 or 2, wherein a part of the fiber is heat-sealed. 4. The herbicidal sheet according to claim 1, wherein (c) the base material layer further has a scrim made of fibers having a melting point of 200 ° C. or higher.