JPWO2016159116A1 - Natural lawn net - Google Patents

Abstract

The present invention provides a natural lawn-growing net having good workability (extensive and easy to reduce opening ratio), good lawn growth and suitable strength suitable for use. Specifically, the present invention is a network obtained by orienting monofilament yarns in three axial directions, (1) crossing portions of the monofilament yarns are laminated or woven or knitted, (2) Provided is a net for nurturing a natural lawn comprising a net-like body, wherein the opening ratio of the net-like body is 80% or more.

Description

  The present invention relates to a natural lawn growing net.

  The natural lawn growing net of the present invention is attached to the net after growth by, for example, spreading a natural lawn growing net in the field of a lawn producer and entwining the net with a rhizome of the natural lawn. In such a state, it can be cut into a big roll shape and used for the purpose of spreading a natural turf roll on a desired turf construction site to complete a greening state.

  Currently, when constructing natural turf on sports facilities, parks, riverbanks, etc., the natural turf that has been sufficiently grown in the field of lawn producers in advance is cut into big rolls and then deployed directly on the turf construction site. Is popular.

  According to this construction method, the greening state can be completed at the same time as the turf construction is completed.

  In stadiums such as soccer stadiums, alien species such as Tifton turf are mainly used so that the greening state can be maintained even in winter. The method of growing grass is taken. Thereby, since the rhizome of the turf is sufficiently entangled with the net material, it is suppressed that the lawn is separated and peeled off when cutting into a big roll shape.

  In relation to this, for example, Patent Document 1 states that “the net 4 is spread on the leveled farm field 1 and then the lawn 2 that has been unrolled is applied to the ground 3 and the turf root 21 is entangled with the net. A turf sheet for vegetation in which grass 2 is cultivated and then rooted to carry grass is disclosed. Patent Document 2 states that “the function of water permeability, breathability, decomposability, or water retention is provided for a field where turf root remains after turf is entangled in a net and then peeled off as sheet-like turf. A vegetation turf sheet in which one or a plurality of nets separately provided, or a net having one or several types of the functions described above is developed and turf is entangled with the net to support the turf. Has been.

Japanese Patent Laid-Open No. 7-246023 (Claim 1, FIG. 1, etc.) JP-A-10-215682 (Claim 1, FIG. 1, etc.)

  The net material is preferably a material having a large opening ratio so as not to hinder the growth of the lawn, and it is more preferable that the width (wire diameter) and thickness of the yarn constituting the net material are also small. When the aperture ratio is small or the net material has a large yarn width and thickness, the lawn lifts the net material as the turf grows, and the net material is difficult to get entangled with the rootstock. In this case, the field manager needs to correct the net material by pressing it with a bamboo skewer. In addition, the net material is manually stretched in a vast field, but if the net material is not adequately elastic, the net lattice is likely to be distorted during the expansion, which affects the decrease in the aperture ratio and the stretchability. Arise.

  In addition, the net material will be unnecessary when the turf construction on the stadium is completed, but the strength of the net material will remain even after several years after construction, so it will be a spike of the player during the competition. There is a risk of the net material getting caught and falling. In addition, when used for greening schoolyards, areas where children frequently run around, such as around playground equipment, consumes grass very quickly and the net material is exposed to the ground, and the net material is entangled with the child's feet. It may also cause a fall accident.

  At present, a net material in which a polyethylene yarn is knitted into a biaxial Russell weave is widely used. This is because the stretchable Russell weave is adopted in consideration of the large opening ratio and the stretchability at the time of net construction. Distortion occurs and the aperture ratio decreases. For this reason, it is necessary for the field worker to always maintain the tension state while pulling the net material. That is, there is a problem in stretchability.

  In addition, the raschel weave is an entangled weave made up of a plurality of yarns, so that a plurality of yarns in one longitudinal direction of the net material are twisted up, resulting in excessive strength and easy after turf construction. There is a disadvantage of not cutting. That is, there is a risk that the player or the child may fall after the turf construction. Furthermore, the Russell weave is a special fabric and is generally expensive.

  Therefore, the present invention is to provide a natural lawn growing net having good net workability (extensive and difficult to reduce the opening ratio), good lawn growth and suitable strength suitable for use. Objective. The moderate strength here means that the lawn can be sufficiently prevented from separating and peeling off when the natural turf after growing is cut into a big roll. It refers to the strength possessed.

  As a result of intensive studies to achieve the above object, the present inventors have found that the above object can be achieved by a specific network obtained by orienting monofilament yarns in three axial directions, and complete the present invention. It came to.

That is, the present invention relates to the following natural lawn growing net.
1. A net obtained by orienting monofilament yarns in three axial directions,
(1) The crossing portion of the monofilament yarn is laminated or woven or knitted,
(2) The opening ratio of the mesh body is 80% or more.
A natural lawn-growing net consisting of a net-like material.
2. The natural grass cultivation net according to Item 1, wherein the intersecting portion is a portion where three monofilament yarns having different orientation directions intersect at one point.
3. The natural lawn growing net according to Item 2, wherein the triangle formed by the three monofilament yarns having different orientation directions is a regular triangle.
4). The natural lawn growing net according to any one of Items 1 to 3, wherein the monofilament yarn contains at least one selected from the group consisting of a polyolefin resin, a polyvinyl alcohol resin, and a biodegradable resin.
5. The natural lawn growing net according to any one of Items 1 to 4, wherein the monofilament yarn is a flat yarn.
6). The natural lawn growing net according to Item 5, wherein the flat yarn is a uniaxially stretched flat yarn.
7). Item 7. The natural lawn growing net according to Item 5 or 6, wherein the flat yarn has a yarn width of 0.5 to 1.5 mm.
8). The natural lawn growing net according to any one of Items 5 to 7, wherein the flat yarn has a yarn fineness of 400 to 800 dt.
9. The natural grass growing net according to any one of Items 5 to 8, wherein the flat yarn has a yarn thickness of 15 to 85 µm.
10. The natural grass growing net according to any one of Items 5 to 9, wherein the flat yarn has a yarn basis weight of 5.0 to 10.0 g / m ² .
11. The said net-like body is a natural lawn growing net in any one of said claim | item 5-10 whose space | interval which adjoins the said flat yarns orientated in the same direction is 20-40 mm.

  The natural lawn growing net of the present invention is a net-like body obtained by orienting monofilament yarns in three axial directions, (1) crossing portions of the monofilament yarns are laminated or woven or knitted (2 ) When the mesh body has an opening ratio of 80% or more, it exhibits good net workability, good lawn growth, and suitable strength suitable for use. In other words, in addition to having good net workability that it has good stretchability and it is difficult to reduce the opening ratio due to the presence of moderate stiffness, the lawn separates when the natural turf after growth is cut into a big roll, It has a moderate strength that can sufficiently prevent peeling and the like, and can be cut without causing a fall accident after turf construction.

It is a schematic diagram which shows an example of the orientation aspect of the monofilament yarn (flat yarn) in the natural lawn growing net of this invention. It is a schematic diagram which shows an example of the orientation aspect of the monofilament yarn (flat yarn) in the natural lawn growing net of this invention.

  Hereinafter, the natural lawn growing net of the present invention will be described in detail.

The natural lawn growing net of the present invention (hereinafter also referred to as “the net of the present invention”) is a net obtained by orienting monofilament yarns in three axial directions,
(1) The crossing portion of the monofilament yarn is laminated or woven or knitted,
(2) The opening ratio of the mesh body is 80% or more.
It consists of a net-like material characterized by

  The natural lawn growing net of the present invention having the above characteristics exhibits good net workability, good lawn growth and suitable strength suitable for the application. In other words, in addition to having good net workability that it has good stretchability and it is difficult to reduce the opening ratio due to the presence of moderate stiffness, the lawn separates when the natural turf after growth is cut into a big roll, It has a moderate strength that can sufficiently prevent peeling and the like, and can be cut without causing a fall accident after turf construction.

  Examples of the shape of the monofilament yarn used in the present invention include a flat yarn, a teg-shaped round yarn, and the like, and are not particularly limited. However, it is preferable to use a flat yarn from the viewpoint of adhesiveness and entanglement strength at the intersection of the monofilament yarn. The flat yarn, which is a subordinate concept of the monofilament yarn, includes both a single layer film and a multilayer film. Hereinafter, the monofilament yarns having various shapes are collectively referred to as “yarns” or “threads”.

  The material of the yarn is not limited, but at least one of a thermoplastic resin, a polyvinyl alcohol resin, a biodegradable resin, and the like can be used. Examples of the biodegradable resin include polylactic acid resin.

  Examples of the thermoplastic resin include polyethylene resins such as low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), and ethylene-α-olefin copolymer, and isotactic polypropylene. Polyolefin resins such as polypropylene resins; polyester resins; polyamide resins; polyurethane resins and the like. These thermoplastic resins can be used alone or in combination of two or more.

  The said high density polyethylene shows the polyethylene whose specific gravity is 0.94 or more. As melting | fusing point of a high density polyethylene, the thing of 115-140 degreeC is preferable, for example, and the thing of 120-135 degreeC is more preferable. Low density polyethylene refers to polyethylene having a specific gravity of 0.93 or less. These high-density polyethylene and low-density polyethylene may be used alone, or may be used by laminating or blending.

  Examples of the α-olefin constituting the ethylene-α-olefin copolymer include propylene, 1-butene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like. Is mentioned.

  Among these thermoplastic resins, a polyolefin resin is preferable in view of deterioration rate after construction, cost, and the like, and at least one of a polyethylene resin and a polypropylene resin is particularly preferable. That is, the material of the yarn used in the present invention is preferably at least one of polyolefin resin, polyvinyl alcohol resin and biodegradable resin. In addition, in the range which does not inhibit the effect of this invention, in order to accelerate | stimulate the deterioration after construction, you may add the deep color pigment etc. which are easy to absorb an ultraviolet-ray as an additive.

  The yarn used in the present invention is preferably a uniaxially stretched yarn obtained by heating the resin (or resin composition) constituting the yarn at a temperature below the melting point, preferably below the melting point, and stretching it several times or more in the machine direction. Hereinafter, a flat yarn will be exemplified and described as a preferred example of the monofilament yarn.

  As a method for producing a flat yarn, for example, a resin (or resin composition) is supplied to an extruder, melt-kneaded, and then extruded from the extruder to form a single-layer or multilayer resin film. Is stretched 2 to 10 times in the longitudinal direction to produce a uniaxially stretched thermoplastic resin film, and this uniaxially stretched resin film is cut into a predetermined width so that the stretch direction is the length direction of the flat yarn. The method of manufacturing is mentioned. In the case of producing a flat yarn by forming a multi-layer resin film, by providing a heat-melting layer in the outer layer, it is possible to laminate and bond the intersecting portions of the flat yarns by thermal fusion.

The yarn width, yarn fineness, yarn thickness, basis weight, etc. of the flat yarn used in the present invention are not limited, and are preferably as small as possible considering the viability of the lawn. However, if the net of the present invention becomes too small, the net Therefore, it is preferable to satisfy the following conditions. That is,
The yarn width is preferably 0.5 to 1.5 mm, more preferably 0.8 to 1.2 mm.

  The yarn fineness is preferably 400 to 800 dt, more preferably 500 to 750 dt.

  The yarn thickness is preferably 15 to 85 μm, more preferably 25 to 75 μm.

The basis weight of the yarn is preferably 5.0~10.0g / ^{m 2,} more preferably ^{6.0~9.0 / m 2, 8.4~8.9 / m} 2 is most preferred. In the present invention, the basis weight of the yarn is such that the material of the yarn is at least one of a polyolefin-based resin and a biodegradable resin from the viewpoints of net workability, lawn growth and deterioration, and the net orientation axis. It is particularly preferable that the number is a predetermined three axis and is 6.0 to 9.0 / m ² .

  The net of the present invention is a network obtained by orienting yarns in three axial directions.

  The mesh body includes warp yarns, weft yarns or diagonal yarns made of yarn, and warp yarns, weft yarns or diagonal yarns that run obliquely or perpendicularly to these yarns, and it is only necessary to have a triaxial orientation. By forming the net-like body from the orientation in the triaxial direction, it is possible to suppress distortion of the lattice at the time of expansion and suppress a decrease in the aperture ratio.

  That is, the net-like body has a plurality of yarns arranged in parallel at predetermined intervals and a plurality of yarns arranged in parallel at predetermined intervals in a direction intersecting each yarn of the yarn rows. And formed by laminating or knitting the intersections of the yarns of these yarn rows. Among these, an embodiment in which three (three) yarns having different orientation directions intersect at one point is preferable.

  The net-like body may be composed of, for example, a weft thread 1b and diagonal threads 1a and 1d as shown in FIG. 1, and a warp thread 1a, weft thread 1b and oblique thread 1d as shown in FIG. Good. 1 and 2 both illustrate an embodiment in which the intersecting portions of the yarns are laminated and bonded, but the present invention is not limited to this embodiment, and an embodiment in which the intersecting portions of the yarns are woven or knitted is also included in the present invention. .

  Hereinafter, the mesh body will be described with reference to FIGS. 1 and 2 as representative examples.

  1 and 2, a large number of yarns 1a, 1a,... Are arranged in parallel at a predetermined interval, and a large number of yarns 1A are inclined or orthogonal to the yarn 1a of the yarn row 1A. Are arranged in parallel at predetermined intervals, and a plurality of yarns 1d, 1d,... Are arranged in a direction oblique to the two yarn arrays 1A, 1B. The yarn rows 1D arranged side by side at a small interval are overlapped, and the intersections of these yarn rows 1A, 1B, 1D yarns 1a, 1b, 1d are laminated and bonded (known in the art such as heat fusion and adhesive) A large number of through holes 1c are provided by integrating them by means.

  In the net of the present invention, the triangle formed by the three yarns having different orientation directions is preferably a regular triangle. That is, the net having the orientation shown in FIG. 1 is preferable. In FIG. 1, a regular triangular honeycomb is the smallest unit, and this aggregate is a regular hexagonal honeycomb, and a rhomboid honeycomb is also formed. Therefore, in order to achieve a high aperture ratio of 80% or more, the number of yarns used is small. Is also excellent in load dispersibility due to lawn mass when harvesting big rolls.

  When a flat yarn is used for the net-like body, the adjacent interval between yarns oriented in the same direction (the interval between the centers of adjacent yarns) is preferably 20 to 40 mm, and more preferably 25 to 30 mm. That is, the warp yarn, the weft yarn, and the diagonal yarn are each preferably 0.6 to 1.2 yarns / inch, and more preferably 0.8 to 1 yarn / inch. Further, the warp yarn, the weft yarn, and the diagonal yarn are each preferably arranged to be 400 to 800 dt, and more preferably 500 to 750 dt.

  In the present invention, the aperture ratio of the mesh is 80% or more. This aperture ratio shows the ratio of the through-hole 1c in FIG. 1, FIG. 2, and is a numerical value calculated | required by the following formula.

Opening ratio (%) = (a / a + c) ² × 100
[However, a: clearness (mm), b: number of yarns / inch, c: yarn width (mm), and a = 25.4 / bc. ]

  The net aperture should be 80% or higher, but if the aperture is too large, the mesh will be too coarse and the rhizomes will be entangled. Therefore, the upper limit is preferably about 95%. That is, the opening ratio of the mesh body is preferably 80 to 95%, and more preferably 85 to 90%.

  There is no limitation on a method for producing a mesh body using yarn, and any method may be used as long as the mesh body is formed by orienting the yarns in three axial directions, and the yarn intersections are laminated and bonded or woven or knitted. In the case of using a yarn, when manufacturing a laminated nonwoven fabric obtained by laminating and bonding crossing portions of flat yarns, the triaxial device and the manufacturing method described in Japanese Patent No. 1442884 and Japanese Patent No. 1725947 should be adopted. Can do.

  Specifically, while the vertical axis yarns are aligned at arbitrary intervals and wound in one axial direction, the horizontal axis yarns are also aligned at arbitrary intervals at the same time in the horizontal axis direction, and the horizontal axis yarns are obliquely moved by traverse movement. It is possible to obtain a triaxially laminated nonwoven fabric that is integrated into a sheet form by operating a laminating apparatus that aligns the arrangement, laminating the vertical axis yarn and the horizontal axis yarn vertically, and then crimping on a heating roll of about 120 ° C. it can. The present invention is not limited to this manufacturing method.

  In the present invention, in addition to the case where the yarn intersections are laminated and bonded, the woven / knitted portion can be thermally bonded by heat-treating the woven / knitting portion even when the yarn intersection is woven / knitted.

  The strength of the net of the present invention can be widely adjusted according to the requirements of the yarn material, width, fineness, thickness, basis weight, etc., but the net workability, lawn growth, turf workability and deterioration (turf construction) It is preferable to set in consideration of the balance of the subsequent net cutting ability. In terms of degradability, it is preferable that the cutting performance does not cause a fall accident after turf construction. The tensile strength in the flow direction of the net alone (JIS-L-1096: 2010 at the time of turf construction after the lawn growing period) (Measured by (Method A)) is preferably about 25.0 to 45.0 N / 50 mm. The tensile strength at the time of turf construction is preferably about 40.0 to 45.0 N / 50 mm in terms of both the turf construction performance and the degradability caused by developing the cut big roll.

  The present invention will be specifically described below with reference to examples and comparative examples. However, the present invention is not limited to the examples.

Example 1
A triaxial laminated nonwoven fabric (net) was produced using a US flat yarn manufactured by Diatex Co., Ltd. having a thread width of 1.2 mm and a fineness of 750 dt, having a three-layer structure in which an HDPE layer was arranged in the core and an LDPE layer was arranged in the surface layer. . In the production of the net, the yarn interval was 30 mm, the remaining two axes were arranged at an oblique angle of 60 ° with respect to the vertical axis, and the yarn intersections were laminated and bonded at 120 ° C. The opening ratio of the net was 89%.

  The triaxial device and the production method of the triaxial laminated nonwoven fabric employed the triaxial device and the production method described in Japanese Patent No. 1442884 (the same applies to Examples 2, 3 and Comparative Example 3).

Example 2
A triaxial laminated non-woven fabric (net) was manufactured using a US flat yarn manufactured by Diatex Co., Ltd. having a thread width of 1.2 mm and a fineness of 540 dt, having a three-layer structure in which an HDPE layer is disposed in the core and an LDPE layer is disposed in the surface layer. . In the production of the net, the yarn interval was 30 mm, the remaining two axes were arranged at an oblique angle of 60 ° with respect to the vertical axis, and the yarn intersections were laminated and bonded at 120 ° C. The opening ratio of the net was 89%.

Example 3
A USPP flat yarn made by Diatex Co., Ltd., having a three-layer structure in which a polypropylene layer having a melting point of about 170 ° C. in the core and a low melting point polypropylene layer having a melting point of about 150 ° C. in the surface layer and having a yarn width of 1.0 mm and a fineness of 750 dt is used. A triaxial laminated nonwoven fabric (net) was prepared. In the production of the net, the yarn interval was 30 mm, the remaining two axes were arranged at an oblique angle of 60 ° with respect to the vertical axis, and the yarn intersections were laminated and bonded at 150 ° C. The net aperture ratio was 90%.

Example 4
A triaxial laminated nonwoven fabric (net) was produced using a biodegradable flat yarn made of polylactic acid resin having a yarn width of 1.5 mm and a fineness of 800 dt. In the production of the net, the yarn interval was 30 mm, the remaining two axes were arranged at an oblique angle of 60 ° with respect to the vertical axis, and the yarn intersections were laminated and bonded at 120 ° C. The opening ratio of the net was 87%.

Comparative Example 1
A biaxially laminated non-woven fabric (net) was manufactured using a US flat yarn made by Diatex Co., Ltd. having a thread width of 1.5 mm and a fineness of 440 dt, with a three-layer structure in which an HDPE layer was arranged in the core and an LDPE layer was arranged in the surface layer. . In the production of the net, the yarn interval was 25.4 mm, and the yarn intersections were laminated and bonded at 120 ° C. The net aperture ratio was 90%.

  The biaxial device and the production method of the biaxially laminated nonwoven fabric employ the biaxial device and the production method described in Japanese Patent No. 1699011 (the same applies in Comparative Example 2).

  The details of the manufacturing method were as follows.

  While the vertical axis yarns are aligned at a predetermined interval and wound in one axial direction, the horizontal axis yarns are also aligned at a predetermined interval in the horizontal axis direction, and the horizontal axis yarn group is transferred in an aligned state on the conveyor. The horizontal axis yarn group cut with a large temporary pressure-bonding belt, cut with a heat cutter for each predetermined product width and coated with a slightly adhesive liquid, was temporarily pressure-bonded to the belt surface.

  Next, in a state where the horizontal axis yarn group is temporarily press-bonded to the surface, it is transferred to the stacking part with the vertical axis yarn, and after being vertically stacked, it is finally pressed on a heating roll at about 120 ° C. to be integrated into a sheet form. A biaxially laminated nonwoven fabric was obtained.

Comparative Example 2
A biaxially laminated non-woven fabric (net) was manufactured using a US flat yarn made by Diatex Co., Ltd. having a thread width of 1.5 mm and a fineness of 440 dt, with a three-layer structure in which an HDPE layer was arranged in the core and an LDPE layer was arranged in the surface layer. . In the production of the net, the yarn interval was 12.7 mm, and the yarn intersections were laminated and bonded at 120 ° C. The net aperture ratio was 78%.

Comparative Example 3
A triaxial laminated non-woven fabric (net) was manufactured using a US flat yarn manufactured by Diatex Co., Ltd. having a thread width of 1.2 mm and a fineness of 540 dt, having a three-layer structure in which an HDPE layer is disposed in the core and an LDPE layer is disposed in the surface layer. . In the production of the net, the yarn interval was 15 mm, the remaining two axes were arranged at an oblique angle of 60 ° with respect to the vertical axis, and the yarn intersections were laminated and bonded at 120 ° C. The net aperture ratio was 78%.

Test example 1
For nets produced in the examples and comparative examples, after conducting net construction and lawn cultivation in the field of lawn growers throughout the year, they were cut into big rolls, and turf construction was performed at the stadium for comprehensive evaluation. went.

  In addition, as a big roll used for evaluation, the lawn type was a standard product of Tifton 419, width 760 mm, roll length 13.2 m, and total mass 500 kg / piece.

(1) Net workability The evaluation criteria were as follows (A and B passed).
A: There is stiffness, excellent stretchability, and no distortion occurs in the net lattice.
B: Although there is stiffness, the stretchability is slightly inferior. However, the net lattice is not distorted.
C: Although there is stiffness, the stretchability is slightly inferior. Furthermore, the net lattice is distorted.
D: There is no stiffness and the spreadability is inferior. Furthermore, the net lattice is distorted.

(2) Lawn growth The evaluation criteria were as follows (A and B passed).
A: The turf that has begun to grow does not interfere with the net and passes through the net grid.

Correction by bamboo skewers is almost unnecessary in summer.
B: The turf that has begun to grow is interfering with the net, but passes through the net grid.

Correction by bamboo skewers is almost unnecessary in summer.
C: The grass that has begun to grow interferes with the net, and the net is lifted.

Correction with bamboo skewers is required every other week in summer.
D: The grass that has begun to grow interferes with the net, and the net is lifted.

    Correction by bamboo skewers is required almost every few days in summer.

(3) Degradability (3-1) Net cutting ability when turf construction was performed at the stadium The evaluation criteria were as follows (A and B passed).
A: The net in the lawn is easily cut when the lawn is constructed on the stadium.
B: Although the net in the lawn is easily cut at the stage of turf construction on the stadium, the residual strength is slightly low, and the big roll can be sluggish within an allowable range.
C: The net in the lawn can be cut at the stage of turf construction on the stadium, but there is strong resistance.
D: It is difficult to cut the net material in the lawn at the stage of turf construction on the stadium.
E: The big roll breaks along with the net at the stage of turf construction on the stadium.
(3-2) Net tensile strength (stress at cutting) when turf construction was performed at the stadium
The turf is removed from the big roll where the turf was constructed, and the tensile strength test is performed in accordance with JIS-L-1096: 2010 (Method A) in the flow direction of the net material taken out so that the shape does not collapse. Was measured.

  The results of each test are shown in Table 1.

1b ... Weft 1a, 1d ... Yarn 1c obliquely or orthogonally to weft 1b ... Opening (through hole)
DESCRIPTION OF SYMBOLS 1A ... Yarn row | line 1B which arranged many yarn 1a, 1a ...... Yarn row | line | column 1D which arranged many yarn 1b, 1b ...... Yarn row | line | column which arranged many yarn 1d, 1d ...

Claims (11)

A net obtained by orienting monofilament yarns in three axial directions,
(1) The crossing portion of the monofilament yarn is laminated or woven or knitted,
(2) The opening ratio of the mesh body is 80% or more.
A natural lawn-growing net consisting of a net-like material.   The natural grass cultivation net according to claim 1, wherein the intersecting portion is a portion where three monofilament yarns having different orientation directions intersect at one point.   The natural lawn growing net according to claim 2, wherein the triangle formed by the three monofilament yarns having different orientation directions is a regular triangle.   The natural lawn growing net according to any one of claims 1 to 3, wherein the monofilament yarn contains at least one selected from the group consisting of polyolefin resin, polyvinyl alcohol resin and biodegradable resin.   The natural lawn growing net according to any one of claims 1 to 4, wherein the monofilament yarn is a flat yarn.   The natural lawn growing net according to claim 5, wherein the flat yarn is a uniaxially stretched flat yarn.   The natural grass growing net according to claim 5 or 6, wherein the flat yarn has a yarn width of 0.5 to 1.5 mm.   The natural grass growing net according to any one of claims 5 to 7, wherein the flat yarn has a yarn fineness of 400 to 800 dt.   The natural grass growing net according to any one of claims 5 to 8, wherein the flat yarn has a yarn thickness of 15 to 85 µm. The flat yarn is the yarn basis weight of 5.0~10.0g / ^{m 2,} natural turf growing net according to any one of claims 5-9.   11. The natural lawn growing net according to claim 5, wherein an interval between adjacent flat yarns oriented in the same direction is 20 to 40 mm.

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