JP6501471B2 - High weatherproofing grass sheet - Google Patents

Description

  The present invention relates to a highly weatherproofing grass sheet which is laid on soil and used to suppress the growth of weeds and the like in the agricultural field and the civil engineering field, and in particular, it is excellent in weatherability, penetration resistance and workability. Furthermore, the present invention relates to a highly weatherproofing sheet having a sufficient light shielding property.

  The grass-preventing sheet has a grass-preventing effect to block the light to the soil and suppress the growth of weeds, and to maintain the aesthetic appearance of buildings and street trees, or on the cultivation ground such as orchards and vegetable gardens It is used to lay directly and improve the growing environment of fruit trees and vegetables.

  In the past, vinyl sheets, rubberized woven sheets, etc. were laid on the soil, but when the sheets were not permeable and water did not penetrate the ground, they were laid between trees, There was a problem that trees would die because the soil became dry.

  In order to solve such problems, in recent years, a means of laying a fabric such as a non-woven fabric or a woven fabric has been taken from the viewpoint of water permeability as a means of preventing grass.

  For example, Patent Document 1 discloses a grass protection sheet having a multiple structure of woven fabric. However, although it is excellent in the light shielding property because it has a multiple structure, all the fibers that make up the sheet are subjected to direct sunlight and are used outdoors for a long time because the bonding part that bonds the layers is provided on the entire surface. There was a possibility that the whole sheet might deteriorate. In addition, although there is a light shielding property and water permeability, there is also a possibility that the penetration of the sheet can not be completely suppressed in the case of chigaya, sugina or the like having a large gap between fibers and having a high penetration force.

  For example, Patent Document 2 discloses a grass protection sheet having a multilayer structure having a modified asphalt layer and a non-woven fabric. However, although two layers of the modified asphalt layer are provided and the penetration resistance is excellent, there is a possibility that the sheet itself is hard and the workability is inferior.

JP 2004-73146 A JP, 2009-138486, A

  In order to solve the above-mentioned subject, the present invention aims at providing a grass protection sheet which is excellent in weather resistance, penetration resistance, and construction nature, and also has sufficient shade performance.

That is, the present invention is a highly weatherable grass protection sheet having a double structure, which is a double weave knit having a bonded portion in which the surface layer and the back layer are bonded and a non-bonded portion in which the surface layer and the back layer are not bonded. consists earth, the co-woven part Ri Na by interspersed, the surface layer is the transmittance in the wavelength region of 220~700nm is 5% or less, the total fineness of the yarn constituting the double woven knitted fabric It is a highly weather resistant grass sheet having a single yarn fineness of 1.0 to 5.0 dtex and 77 to 330 dtex .
Here, it is preferable that the total area ratio of the said connection part is 0.3 to 20% of the whole.
Moreover, it is preferable that the area per one of the said connection part is 0.25-100.0 cm < ² >.
Moreover, it is preferable that the space | interval of the said connection part is 1-100 cm .
Also, the surface layer and the back layer is preferably the tissue is twill.
Moreover, it is preferable that the said high weatherproof grass sheet has a holding strength of 400 N / 2.54 cm or more.
Moreover, it is preferable that the said high weatherproof grass sheet has 10 N or more of penetration resistance.

  The highly weather-resistant grass sheet of the present invention is excellent in weather resistance, penetration resistance, and workability, and exhibits an effect of having sufficient light shielding properties.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows typically the high weatherproof grass sheet which concerns on this invention. It is sectional drawing shown typically in AA 'of FIG.

Hereinafter, embodiments of the present invention will be described.
The present invention is a highly weatherproofing grass sheet having a double structure, which comprises a double woven fabric having a bonded portion for bonding the surface layer and the back layer and a non-bonded portion for not bonding the surface layer and the back layer. It is a highly weatherproofing grass sheet which is made to intersperse the said connection part.

  In the present invention, for example, as shown in FIG. 1, bonding bands 6 are provided at both ends, and junctions 4 are scattered in other parts, and as shown in the cross-sectional view of FIG. It is the high weatherproof grass sheet 1 which provides the bonded part 4 which made 3 connect by the bonded part 4, and the non-bonded part 5 which is not made to be bonded.

  The “junction” used in the present specification is a collection of junctions, and if the distance between adjacent junctions is less than 1 cm, it is regarded as one junction 4. The bonding point referred to here indicates a place where the front and back layers are woven or knitted to connect the surface layer 2 and the back layer 3.

  Moreover, it does not specifically limit as an arrangement | positioning position of the connection part 4, For example, lattice shape, zigzag shape, random shape etc. are mentioned. Among them, the lattice shape as shown in FIG. 1 is preferable in terms of productivity and workability.

  In addition, the shape of the bonding portion 4 is not particularly limited, and examples thereof include a square, a triangle, a circle, an oval, and a star. Among them, a square as shown in FIG. 1 is preferable in terms of productivity.

  Moreover, it is preferable to provide the bonding band 6 which made the surface layer 2 and the back layer 3 of the both ends of a transversal direction couple | bond the highly weatherproof grass sheet 1 with it. By providing the connecting band 6, stable work can be performed at the time of construction, and the sheet after construction may be shaken by wind or the like to reduce flutter. The bonding band 6 may be bonded by bonding, heat sealing, an adhesive, sewing or the like. When the bonding band 6 is provided by bonding, the bonding band 6 is not included in the bonding portion 4 of the present invention.

  The weather-resistant and grass-proof sheet 1 of the present invention has a structure having a double bond structure 4 and a non-bond structure 5 on the surface layer 2 and the back layer 3 of a double structure. In the non-bonding portion 5, the surface layer 2 and the back layer 3 are separated, and since it becomes a two-layered woven fabric overlapped, it is possible to easily obtain a light shielding property. In addition, it is more difficult for a plant to penetrate a two-layered woven fabric than one single layer, and the penetration resistance is also improved. Furthermore, the back layer 3 can be protected by the surface layer 2 from the influence of solar radiation, the strength of the entire sheet can be maintained, and the weather resistance can be maintained.

  Further, by making the bonding portions 4 dotted, it is possible to reduce the displacement between the surface layer 2 and the back layer 3 and the slack, obtain excellent workability, and suppress the strength deterioration of the fibers of the back layer 3 only by the knot portion 4 It becomes possible. Furthermore, the connection part 4 can be made into the standard of the dimension at the time of construction, and workability | operativity improves.

It is preferable that the area per one bonding part 4 is 0.25-100.0 cm < ² >. If it is 0.25 cm < ² > or more, it can prevent that the fiber of the bonded part 4 is broken by the shift | offset | difference of the surface layer 2 and the back layer 3, or the force from the outside. If the area is 100.0 cm ² or less, the weather resistance of the sheet can be maintained while maintaining the bond between the surface layer 2 and the back layer 3.

  Moreover, it is preferable that the total area ratio of the connection part 4 is 0.3 to 20% of the whole. If it is 0.3% or more, separation of the surface layer 2 and the back layer 3 can be suppressed, and furthermore, wrinkles and deflection during construction can be reduced. Moreover, the area which the fiber of the back layer 3 degrades as it is 20% or less can be made small, and a weather resistance can be maintained. The total area ratio in the present invention indicates the ratio of the total area of the bonded portion 4 in the vertical 100 cm × horizontal 100 cm of the high weather resistant grass sheet 1. The total area ratio is measured at 5 arbitrarily selected locations, and the average value is calculated from the total area ratio.

  Moreover, it is preferable that the space | interval of the connection part 4, ie, the shortest distance of adjacent connection part 4 comrades, is 1-100 cm. More preferably, it is 3-70 cm. If it is 1 cm or more, the weather resistance can be maintained without being affected by the deterioration of the adjacent bonding portions 4. Moreover, if it is 100 cm or less, generation | occurrence | production of the wrinkles at the time of construction, bending, etc. can be suppressed, and construction property will improve. Furthermore, breakage or tearing of the bonding portion 4 can also be reduced by an external force such as wind.

  The fiber type used in the surface layer 2 and the back layer 3 of the present invention can be preferably exemplified in that synthetic fibers such as polyester, polyamide, polypropylene and the like have good strength and weather resistance.

  Moreover, as a structure of the yarn to be used, a total fineness of 77 to 330 dtex and a fineness of single yarn of 1.0 to 5.0 dtex are preferable because they have good weaving properties. Within this range, the flexibility is excellent, and the workability and the workability are improved.

  Also, a primary yarn may be used, and examples include primary yarns such as black, gray, brown, blue and green. Among them, a black base yarn is preferable in that it is more excellent in light shielding property.

  In addition, it is preferable that the fibers contain a weathering agent to further improve the weather resistance of the sheet, if necessary. Examples of the weathering agent to be contained include benzotriazole-based and benzophenone-based ultraviolet absorbers. In the present invention, flame retardants, herbicides, fungicides, insect repellents and the like may be contained in addition to the weathering agents.

  The present invention, as shown in FIG. 2, comprises a double weave knitted fabric of a surface layer 2 and a back layer 3. The type of double-woven fabric is not particularly limited, and double-woven fabrics such as warp double-woven fabrics, weft double-woven fabrics and double-woven double-woven fabrics, double double-woven fabrics such as double denby and double russell, double jersey Etc. can be used. Among them, a double layer woven fabric is preferable from the viewpoint of penetration resistance and light shielding property.

  Further, the structure of the woven and knitted structure of the surface layer 2 and the back layer 3 is not particularly limited, and woven structures such as plain weave, twill weave and satin weave, weft knit structures such as plain knit, rubber knit and pearl knit, tricot and russell And so on, or their combined use or their modified tissues, etc., which may be appropriately selected according to the required characteristics. In addition, threading, density, etc. may be appropriately selected according to the sheet request characteristics. Among them, twill weave is preferable from the viewpoint of achieving both penetration resistance and light shielding properties.

  The surface layer 2 is a protective layer of the back layer 3, and the deterioration of the back layer 3 can be prevented by blocking the incidence of ultraviolet light. The surface layer 2 preferably has a transmittance of 5% or less, more preferably 2% or less, in a wavelength region of 220 to 700 nm. When the transmittance is 5% or less, the surface layer 2 suppresses the incidence of ultraviolet rays, so that the influence of the ultraviolet rays on the back layer 3 is small, and the strength deterioration of the entire sheet can be prevented.

  The high weather resistant grass sheet 1 of the present invention preferably has a light blocking ratio of 95% or more, more preferably 98% or more. If the light blocking rate is 95% or more, the growth of weeds on the ground on which the sheet is applied is inhibited, and the grass effect is improved. The light blocking ratio is measured at the non-connecting portion 5.

It is preferable that the highly weatherable grass sheet 1 of the present invention has a water permeability coefficient of 1.0 × 10 ⁻³ cm / sec or more. If the hydraulic conductivity is 1.0 × 10 ⁻³ cm / sec or more, drying of the soil under the sheet can be prevented, and water such as rain water can be rapidly permeated into the ground. The hydraulic conductivity is measured at the non-connecting portion 5.

  It is preferable that the high weather resistant grass sheet 1 of the present invention has a tensile strength of 1000 N / 2.54 cm in length and 800 N / 2.54 cm in width or more. If this strength is satisfied, the tear at the time of sheet construction can be prevented. The tensile strength is measured at the non-bonding portion 5.

It is preferable that the highly weatherable grass sheet 1 of the present invention has a holding strength of 400 N / 2.54 cm or more after the weathering treatment. If it is this range, even if it is used outdoors for a long period of time, it can tear into a sheet and can reduce a tear. The holding strength in the present invention is set using a super accelerated weathering tester so that the integrated ultraviolet energy amount is 1,300 MJ / m ² (equivalent to 5 years of actual exposure) at a temperature of 60 ± 3 ° C. The conditions of tensile strength after ultraviolet irradiation are shown. The holding strength is measured at the non-bonding portion 5.

  It is preferable that the highly weatherable grass sheet 1 of the present invention has a penetration resistance of 10 N or more. If it is 10 N or more, penetration of the sheet by shoots and the like of a highly penetrating weed can be suppressed. The penetration resistance in the present invention is based on the measuring method of ASTM D 4833 (penetration strength of geotextile (fiber material for civil engineering)), and the measuring jig is a one-piece weed having high penetration. An iron cylinder of 2 mm in diameter and 4 cm in length created on the assumption of new shoots is polished, and evaluated by the penetration resistance of a needle whose tip is 3 cm in a cone portion (hereinafter referred to as a needle needle). The penetration resistance is measured at the non-connecting portion 5.

The following examples illustrate the highly weather resistant grass sheet of the present invention, but the present invention is not limited to these examples.
1. Transmittance In the surface layer of each sheet, the transmittance in the wavelength region of 220 to 700 nm was measured using a spectrophotometer (ultraviolet-visible-near-infrared spectrophotometer UV-3600 manufactured by Shimadzu Corporation). And if it was 5% or less, it was judged that there was no transparency. Comparative Example 1 could not be measured because the surface layer and the back layer were not separated.
2. Penetration Resistance The non-bonded portion of each sheet was measured according to the measuring method of ASTM D 4833 (penetration strength of geotextile (fiber material for civil engineering)). For the penetration jig, a needle needle was used. In Comparative Example 1, since the bonding portion was provided on the entire surface, the measurement was performed at the bonding portion. The penetration resistance is an average value of three maximum values of the obtained resistance. And if it was 10 N or more, it was judged that there was penetration resistance.
3. Shading rate The non-bonded portion of each sheet was measured according to JIS L 1055 A method (light shielding test method for curtain: illuminance 100000 lx before mounting of the test piece). In Comparative Example 1, since the bonding portion was provided on the entire surface, the measurement was performed at the bonding portion. And if it is 95% or more, it was judged that there is light-shielding property.
4. Tensile strength The non-bonded part of each sheet was measured according to JIS L 1096 A method (test method of general fabric). In Comparative Example 1, since the bonding portion was provided on the entire surface, the measurement was performed at the bonding portion. And if it was vertical 1000 N / 2.54 cm or more and horizontal 800 N / 2.54 cm or more, it was judged that there was strength.
5. Holding strength Using “EYE SUPER UV TESTER” Iwasaki Denki Co., Ltd., set the integrated ultraviolet energy amount to 1,300 MJ / m ² (equivalent to 5 years of actual exposure) at a temperature of 60 ± 3 ° C. The tensile strength of each non-bonded part of each sheet after irradiation under the conditions was measured according to JIS L 1096 A method (test method of general fabric). In Comparative Example 1, since the bonding portion was provided on the entire surface, the measurement was performed at the bonding portion. And if it is 400 N / 2.54 cm or more, it was judged to have a weatherability.
6. Permeability coefficient Measured according to JIS A 1218 (Permeability test method for soil). In Comparative Example 1, since the bonding portion was provided on the entire surface, the measurement was performed at the bonding portion. And if it was 1.0 * 10 < ^-3 > cm / sec or more in the hydraulic conductivity, it did not become a problem in actual use, and it was judged that there is water permeability.
7. Weatherability Each sheet provided with at least one bonded part 4 of 70 cm × 30 cm wide is conformed to the method specified in JIS B 7751 (UV carbon arc lamp weather resistance tester) for 20 days (equivalent to 5 years) ) Continued processing. After the treated sheet was applied to a flat soil, 10 randomly selected persons were allowed to walk 50 times over the sheet in the vertical direction, and the sheet state was confirmed.
[Evaluation criteria]
○ I can not see tears or tears.
破 れ There are a few tears and tears, and the soil is slightly exposed.
× There are tears and tears, and the soil is greatly exposed.
8. Penetration resistance Each sheet of vertical 200 cm × horizontal 100 cm was subjected to actual exposure evaluation for 3 months on the soil in which weeds with high penetration power such as chigaya were observed for 3 months, and the sheet condition was visually confirmed.
[Evaluation criteria]
○ Weeds have not penetrated the sheet.
1〜3 1 to 3 weeds penetrate the sheet.
× Four or more weeds penetrate the sheet.
9. Workability A sheet condition such as wrinkles and slack was observed when each sheet was constructed on a soil of 300 cm × 300 cm with a height of 20 cm × 60 cm × 60 cm in the center.
[Evaluation criteria]
The soil followability of the sheet at the level difference and the workability were visually confirmed.
○ There are no wrinkles and deflection, and the workability is good.
△ Almost no wrinkles, no deflection, and the workability is somewhat good.
× Wrinkles and deflection occur, and the workability is poor.

In Examples and Comparative Examples described below, an air jet loom (manufactured by Toyoda Automatic Loom Co., Ltd.) was used for weaving, and each property was evaluated according to the above measurement method.
Example 1
Process of twill weave using polyester black original processing processed yarn 167 dtex / 36f (made by NAN YA PLASTICS CORPORATION (hereinafter referred to as NAN YA)) for warp and polyester black original processing processed yarn 167 dtex / 36 f (manufactured by NAN YA) for weft 2 A heavy woven fabric was formed, and it was continuously bonded to both ends 1.5 cm in the transverse direction as a binding band and woven in a bag shape. In addition, the shape of the junction to be scattered other than both ends is a square of 3 cm × 3 cm wide, the area per one is 9.0 cm ² , the total area ratio is 0.5%, and the interval is 50 cm, in a grid shape Provided. The transmittance of the surface layer was 1.0%.

Example 2
It is the same as Example 1 except that the shape of the bonding part is provided so that the shape of the square of 4 cm × 4 cm wide, the area per one is 16.0 cm ² , the total area ratio is 17.6%, and the interval is 10 cm. It was woven.

[Example 3]
A woven structure was prepared in the same manner as in Example 1 except that joints were provided so that the distance between joints was 100 cm and the total area ratio was 0.3%.

Example 4
The woven fabric was woven in the same manner as in Example 1 except that joints were provided so that the distance between joints was 10 cm, the area per unit was 0.25 cm ² , and the total area ratio was 0.3%.

[Example 5]
The woven fabric was woven in the same manner as in Example 1 except that joints were provided so that the distance between joints was 25 cm, the area per unit was 100.0 cm ² , and the total area ratio was 20.0%.

[Example 6]
A woven fabric was prepared in the same manner as in Example 1 except that the surface layer was woven to have a permeability of 5.0%.

[Example 7]
The sheet was woven in the same manner as in Example 1 except that the weave structure of the sheet was a double weave of plain weave, and the permeability of the surface layer was 3.0%.

Comparative Example 1
Process of double satin weave (density: 309 threads) using polyester black original processing yarn 84dtex / 36f (manufactured by NAN YA) for warp, polyester black original processing processed yarn 167dtex / 36f (manufactured by NAN YA) for weft / 2.54 cm, weft 100 / 2.54 cm), and woven so as to provide a joint on the entire surface.

1 High weatherproofing grass sheet 2 surface 3 back layer 4 bonded part 5 non-bonded part 6 bonded zone

Claims (7)

A highly weather resistant grass sheet comprising a double layer structure, comprising: a double woven fabric having a bonded portion in which the surface layer and the back layer are bonded and a non-bonded portion in which the surface layer and the back layer are not bonded. co-woven part Ri Na by interspersed, the surface layer is the transmittance in the wavelength region of 220~700nm is 5% or less, the total fineness of the yarn constituting the double woven knitted fabric and in 77~330dtex , A highly weather resistant grass sheet having a single yarn fineness of 1.0 to 5.0 dtex .   The highly weather-resistant grass sheet according to claim 1, wherein a total area ratio of the bonded portions is 0.3 to 20% of the whole. The high weather resistant grass protection sheet according to claim 1 or 2, wherein an area per one bonded portion is 0.25 to 100.0 cm ² .   The highly weather resistant grass sheet according to any one of claims 1 to 3, wherein the distance between the bonding portions is 1 to 100 cm. The highly weather resistant grass sheet according to any one of claims 1 to 4 , wherein the surface layer and the back layer have a twill weave structure. The high weather resistant grass protection sheet according to any one of claims 1 to 5 , wherein the high weather resistance grass protection sheet has a holding strength of 400 N / 2.54 cm or more. The high weather resistant grass protection sheet according to any one of claims 1 to 6 , wherein the high weather resistance grass protection sheet has a penetration resistance of 10 N or more.