JP6497950B2 - Soil covering sheet - Google Patents

Description

  The present invention relates to a soil covering sheet, and more particularly, a soil covering sheet that is installed in soil and is used in the field of agriculture and civil engineering, and has excellent tear resistance when subjected to physical stress and also has excellent workability. It is related to.

  The soil covering sheet is installed in the soil and is used to prevent sedimentation of gravel and asphalt disposed on the soil covering sheet and to prevent weeds growing from the soil.

  Conventionally, a vinyl sheet, a rubberized woven sheet, or the like has been used as the soil covering sheet, but there is a problem that the sheet is hard and breaks during construction and wrinkles and the like occur. Moreover, there was no followability to the undulation of the undulating soil, and it was necessary to level the ground before construction to eliminate the undulation. Further, there is a problem that the sheet has no water permeability and rain or the like accumulates on the sheet surface.

  In order to solve such problems, in recent years, soil covering sheets having flexibility and water permeability have been developed.

  For example, Patent Document 1 discloses a herbicidal sheet excellent in moisture permeability and light shielding properties, which is made of a woven fabric formed from drawn yarns formed by uniaxial drawing. However, since the sheet uses drawn yarn, there is a problem that the yarn itself is poor in flexibility and workability is poor.

  For example, Patent Document 2 discloses a weedproof sheet made of a woven fabric formed from multifilament yarns and having excellent water permeability and air permeability. However, the sheet is not necessarily sufficient in strength, and the sheet is torn due to external physical stress, and the support for gravel is lost, or gravel or weed on the soil surface protrudes from the torn part. There was a problem of being fooled.

JP 2003-52254 A JP 2002-125484 A

  The present invention solves the above-mentioned problems, and is used in the field of agriculture and civil engineering, and is excellent in tear resistance when subjected to physical stress, and also has excellent workability. It aims at providing a covering sheet.

The present invention achieves the above-mentioned object, and is a soil covering sheet made of a woven fabric composed of multifilament yarns, which has a distance a between adjacent warps per 25.4 mm in the weft direction of the woven fabric. Soil covering characterized in that sum A is 3.2 to 5.5 mm and sum B of adjacent interweft distances b per warp direction 25.4 mm of the woven fabric is 5.0 to 11.0 mm It is a sheet.
Further, the sum of the sum A of the inter-warp distance a and the sum B of the inter-weft distance b is preferably 10.0 to 15.0 mm.
Moreover, it is preferable that the diameter of the multifilament is 0.25 to 0.50 mm.
Moreover, it is preferable that the sliding resistance of the woven fabric is 50.0 N or more.
The thermal shrinkage rate of the woven fabric is preferably 2.5% or less.

  The soil covering sheet of the present invention is provided on the soil and used in the agricultural and civil engineering fields, and provides a soil covering sheet that is excellent in tear resistance when subjected to physical stress and excellent in workability. To do.

It is the model top view and enlarged view of the soil covering sheet which concern on this invention.

  Embodiments of the present invention will be described below.

  The present invention is a soil covering sheet composed of a woven fabric composed of multifilament yarns, and the sum A of adjacent inter-warp distances a (see FIG. 1) per 25.4 mm in the weft direction of the woven fabric is 5.0. A soil characterized in that a sum B of adjacent interweft distances b (see FIG. 1) per warp direction 25.4 mm of the woven fabric is 5.0 to 11.0 mm. It is a covering sheet.

  As the warp and weft yarn used for the soil covering sheet 1 of the present invention, multifilament yarn is employed. The multifilament yarn has more flexibility than a monofilament yarn or flat yarn, and can prevent sheet folding and the like. In addition, the sheet follows the undulating soil, there is no need to level the soil before construction, it not only demonstrates excellent workability, it can also reduce the time required for leveling and improve workability Can do. Moreover, the surface moisture can be efficiently infiltrated into the soil by the capillary action by the multifilament. Furthermore, since the raw yarn itself is flexible, flexibility is obtained at the intersection of the yarns, and the light shielding property is excellent.

  In the present invention, the sum A of the distances a between adjacent warps per 25.4 mm in the weft direction of the woven fabric is 5.0 to 11.0 mm, and / or the adjacent per 25.4 mm in the warp direction of the woven fabric. It is important that the sum B of the inter-weft distance b is 5.0 to 11.0 mm. If it is 5.0 mm or more, the sheet does not become paper-like and there is no possibility of tearing due to physical stress. Moreover, if it is 11.0 mm or less, the balance as a woven fabric can be maintained without generating eye twist, and excellent workability is exhibited.

  Moreover, it is preferable that the distance a between adjacent warps and the distance b between adjacent wefts are 0.5 mm or less. If it is 0.5 mm or less, generation | occurrence | production of eye twist can be reduced. Further, when covering the soil, gravel, weeds, etc. existing on the soil can be suppressed from passing through adjacent yarns and protruding to the sheet surface. Moreover, also when laying gravel on a sheet | seat, the support force with respect to gravel improves.

  Further, the sum of the sum A of the inter-warp distance a and the sum B of the inter-weft distance b is preferably 10.0 to 15.0 mm. If it is 10.0 mm or more, generation | occurrence | production of the tear by the physical stress from the outside can be suppressed. Moreover, if it is 15.0 mm or less, generation | occurrence | production of eye twist can be suppressed and workability | operativity will improve.

  The woven fabric of the woven fabric constituting the present invention is not particularly limited as long as the above-described conditions are satisfied. For example, any structure such as plain weave, twill weave, satin weave can be adopted. Of these, a plain weave is more preferably employed from the viewpoint of excellent flexibility and strength uniformity of the sheet.

  The diameter of the multifilament yarn used for the warp and weft of the woven fabric of the present invention is preferably 0.25 to 0.50 mm from the viewpoint of sheet flexibility. If it is 0.25 mm or more, generation | occurrence | production of the tear of the sheet | seat by a physical stress, etc. can be suppressed. Moreover, if it is 0.50 mm or less, sufficient softness | flexibility will be acquired and workability will improve.

  The fiber type used for the multifilament yarn is not particularly limited. For example, synthetic fibers such as polyester, polyamide, acrylic, polyvinyl chloride, and polyurethane, semi-synthetic fibers such as acetate, triacetate, and promix, Any fiber type of recycled fibers such as rayon and cupra can be used. Of these, synthetic fibers such as polyamide and polyester are preferred because of their good strength and weather resistance.

  The color tone of the soil covering sheet 1 of the present invention is not particularly limited, but is preferably a color tone having a large light absorption, and more preferably a dark color or black color. Specific examples include black, gray, brown, green, and blue. By using the above-described color tone, the light-shielding property is improved, and weeds can be prevented from growing. The method for imparting the color of the sheet is not particularly limited, and examples thereof include the use of dyed yarn, dyeing, and printing.

  The light shielding rate of the soil covering sheet 1 of the present invention is preferably 85% or more, more preferably 90% or more, and particularly preferably 95% or more. If the light shielding rate is 85% or more, sufficient light shielding properties can be obtained, and weed growth can be suppressed.

  The tear strength of the soil covering sheet 1 of the present invention is preferably 50.0 N or more. If it is 50.0 N or more, it is possible to prevent the sheet from being torn or the like due to a physical stress caused by a vehicle, a person, or the like received from the top of the seat after construction or after construction.

  The bending resistance of the soil covering sheet 1 of the present invention is preferably 30 to 100 mm. When the bending resistance is 30 mm or more, sufficient flexibility and followability are obtained, and workability is improved. Moreover, if it is 100 mm or less, a firmness will be obtained to a sheet | seat and workability will improve. Furthermore, even when gravel or the like is arranged on the sheet, a sufficient supporting force can be exhibited.

  The slip resistance of the soil covering sheet 1 of the present invention is preferably 50.0 N or more. If the slip-off resistance is 50.0 N or more, the twist and drop of the raw yarn due to physical stress can be reduced, and the workability and the performance uniformity after construction are also improved.

  It is preferable that the thermal contraction rate of the soil covering sheet 1 of the present invention is 2.5% or less. When the heat shrinkage is 2.5% or less, even when exposed to direct sunlight for a long time, the shrinkage of the sheet due to heat can be suppressed, and the bending of the sheet, breakage from the construction pins, and the like can be reduced. The term “heat shrinkage” as used herein refers to the shrinkage of a sheet when processed for 24 hours in an environment of 90 ° C.

The water permeability coefficient of the soil covering sheet 1 of the present invention is preferably 1.0 × 10 ⁻³ cm / sec or more. If the water permeability is 1.0 × 10 ⁻³ cm / sec or more, rainwater can be sufficiently infiltrated into the soil without water accumulating on the sheet even under heavy rain.

  Further, water absorption treatment, antistatic treatment, flame retardant treatment, weather resistance treatment, sealing treatment, and the like may be performed according to the use as long as the object of the present invention is not impaired. The water absorption treatment is suitable for increasing moisture penetration.

  EXAMPLES Hereinafter, although an Example is given and demonstrated about this invention, this invention is not necessarily limited to the Example.

1. Sum of thread distance
(1) Sum A (mm) of warp distance a per 25.4 mm in the weft direction
Using a microscope (KEYENCE VH-Z100), the surface of each sheet was observed at a magnification of 100 times, and the inter-warp distance a was measured. The product of the average value of the warp distance a of 10 points selected at random and the warp density (2 / 25.4 mm) was calculated, and the sum A of the inter-warp distance a per 25.4 mm in the weft direction was calculated.
(2) Sum B (mm) of inter-weft distance b per 25.4 mm in the warp direction
Using a microscope (KEYENCE VH-Z100), the surface of each sheet was observed at an enlargement magnification of 100 times, and the inter-weft distance b was measured. The product of the average value of the 10 selected interweft distances b and the density of the weft yarns (line / 25.4 mm) was calculated and used as the sum B of the interweft distances b per 25.4 mm in the warp direction.

2. Diameter of warp and weft raw yarn (mm)
Using a microscope (KEYENCE VH-Z100), the surface of each sheet was observed at an enlargement ratio of 100 times, and the average values of the diameters of 10 warp and weft yarns arbitrarily selected were obtained.

3. Tear strength (N)
It measured according to JIS L1096 A-1 method with respect to each of the warp direction and the weft direction. And if it was 50 N or more, it was judged that there was tear strength.

4). Flexibility (mm)
It measured according to JIS L1096A method (45 degree cantilever method) with respect to each of the warp direction and the weft direction. And if it was the range of 30-100 mm, it was judged that the softness | flexibility was favorable. Since the maximum measured value is 150 mm, those exceeding 150 mm are shown as “150 or more” in Table 1.

5). Sliding resistance (N) for each warp and weft direction (ease of thread pull-out)
It measured according to JIS L1096 method (pin hook method). And if it was 50 N or more, it was judged that there was slip-off resistance. Since the maximum measured value is 196N, those exceeding 196N are shown as “196 or more” in Table 1.

6). Thermal shrinkage (%) (Ease of sheet shrinkage)
Using a blowing constant temperature dryer (model number: DRS620DA (manufactured by Advantech Toyo Co., Ltd.)), the thermal contraction rate was measured for each of the warp direction and the weft direction of the sheet after being left in a dryer set at 90 ° C. for 24 hours. . And if it was 2.5% or less, it judged that it was hard to shrink.

7). Shading rate (%)
Measured according to JIS L 1055 A method (curtain shading test method). And if it was 85% or more, it judged that there was light-shielding property.
Illuminance before test piece installation 100,000 lx

8). Coefficient of permeability Measured according to JIS A 1218 (Soil permeability test method). And if it was 1.0 * 10 < ^-3 > cm / sec or more, it was judged that there exists moisture permeability.

9. Construction evaluation Each sheet was laid on a step-shaped soil provided with a step of 10 cm in height. The space created by the step between the laid sheet and the staircase was pressed by hand and applied to the soil, and the followability of the sheet at the step and the workability were confirmed.
(1) Workability ○ The warp and / or the weft are not dropped off or misaligned, and the work is easy to fold without wrinkles.
Δ: Some warps and / or wefts are missing or misaligned, but can be constructed without breaking.
× Warp and / or weft fall off, misalignment, creases, and difficult to work.
(2) Follow-up ability ○ No gap is seen between the sheet and the soil.
△ There is a little gap between the sheet and the soil, but there is no problem in construction.
× There is a wide gap between the sheet and the soil.

10. Evaluation of crack resistance (1) Tear resistance during construction Each sheet of 100cm square is constructed on soil, and two corners on one side are fixed with iron L-shaped pins (diameter 8mm, length 20cm). Grabbed one corner of each side and constructed each sheet while pulling strongly. Thereafter, the tear resistance of each sheet at the fixing portion of the L-shaped pin was confirmed.
○ There is almost no tearing of the sheet from the fixed part of the L-shaped pin.
ΔSlightly torn from the fixed part of the L-shaped pin, but there is resistance when torn.
X The sheet is easily torn from the fixed part of the L-shaped pin.
(2) Tear resistance after construction Excavation of 120cm square and 30cm depth of the ground, putting sand sand (particle size 5mm or less) for leveling, rolling and compacting using compaction machine rammer (HITACHI product number: ZV55R) Thus, a soil having a thickness of about 20 cm was formed. Each of the 100 cm square examples and comparative examples was laid on the soil, and large nails were driven and fixed at the four corners. From there, gravel (single grain crushed stone S-20 (JIS A 5001)) was laid and averaged about 10 cm thick.
Repeated forward and backward movements on the centerline of the laid gravel with a 1t car and repeated 100 times (counting one forward and backward reciprocation as one time) with a constant place of passage, confirming the tear resistance of the sheet after the test did.
○ Almost no tearing or tearing.
△ Slightly tear and tear.
× Many tears, tears are seen.

The examples and comparative examples described below were woven using an air jet loom (product number: JAT710 manufactured by Toyota Industries Corporation).
[Example 1]
Polyfilament yarn made of polyester with a diameter of 0.29 mm for warp (black original yarn, made by NAN YA PLASTICS (hereinafter, made by NAN YA)), polyester multifilament yarn with a diameter of 0.38 mm for weft yarn (made by black original yarn, made by NAN YA) ) Was used to weave a plain weave with a warp density of 78 / 25.4 mm and a weft density of 45 / 25.4 mm to obtain a soil-coated sheet with A of 3.2 mm and B of 7.4 mm. The evaluation results are shown in Table 1.

[Example 2]
Using the same warp and weft as in Example 1, weaving a plain weave with a warp density of 78 / 25.4 mm and a weft density of 42 / 25.4 mm, with A being 3.2 mm and B being 9.2 mm Got. The evaluation results are shown in Table 1.

Example 3
Using the same warp and weft as in Example 1, weaving a plain weave with a warp density of 70 / 25.4 mm and a weft density of 45 / 25.4 mm, with A being 5.5 mm and B being 7.4 mm. Got. The evaluation results are shown in Table 1.

Example 4
Using the same warp as in Example 1, using a polyester multifilament yarn (black original yarn, manufactured by NAN YA) having a diameter of 0.29 mm as the weft, warp density of 78 / 25.4 mm, weft density of 60 / A 25.4 mm plain weave was woven to obtain a soil covering sheet having A of 3.2 mm and B of 7.1 mm. The evaluation results are shown in Table 1.

Example 5
Using the same warp and weft as in Example 4, weaving a plain weave with a warp density of 78 / 25.4 mm and a weft density of 55 / 25.4 mm, with A being 3.2 mm and B being 8.6 mm Got. The evaluation results are shown in Table 1.

Example 6
Using the same warp and weft as in Example 4, weaving a plain weave with a warp density of 78 / 25.4 mm and a weft density of 50 / 25.4 mm, with A being 3.2 mm and B being 10.2 mm Got. The evaluation results are shown in Table 1.

[Comparative Example 1]
Using the same warp and weft as in Example 1, weaving a plain weave with a warp density of 45 / 25.4 mm and a weft density of 35 / 25.4 mm, with A being 11.7 mm and B being 11.4 mm Got. The evaluation results are shown in Table 1.

[Comparative Example 2]
Using the same warp and weft as in Example 4, weaving a plain weave with a warp density of 78 / 25.4 mm and a weft density of 75 / 25.4 mm, with A being 3.2 mm and B being 2.5 mm Got. The evaluation results are shown in Table 1.

[Comparative Example 3]
Using a flat yarn made of polypropylene having a width of 1.0 mm as warp and weft, weaving a plain weave with a warp density of 24 / 25.4 mm and a weft density of 15 / 25.4 mm, with A of 0.1 mm and B of 9.0 mm A soil covering sheet was obtained. The evaluation results are shown in Table 1. Since the flat yarn was flat, the widths of the warp and the weft were measured and used as the diameters of the warp and the weft.

1 Soil cover sheet a Distance between warps b Distance between wefts

Claims (5)

A soil covering sheet made of a woven fabric composed of multifilament yarns, wherein a sum A of warp distances a per weft direction 25.4 mm of the woven fabric is 3.2 to 5.5 mm, and the woven fabric The soil covering sheet, wherein the sum B of the inter-weft distance b per 25.4 mm in the warp direction is 5.0 to 11.0 mm.   2. The soil covering sheet according to claim 1, wherein the sum of the sum A of the inter-warp distance a and the sum B of the inter-weft distance b is 10.0 to 15.0 mm.   The soil covering sheet according to claim 1 or 2, wherein the multifilament yarn has a diameter of 0.25 to 0.50 mm.   The soil covering sheet according to any one of claims 1 to 3, wherein the sliding resistance of the woven fabric is 50.0 N or more.   The soil covering sheet according to any one of claims 1 to 4, wherein the thermal shrinkage of the woven fabric is 2.5% or less.