KR102000917B1 - Structure of artificial turf composite - Google Patents

Abstract

The present invention relates to an artificial turf structure, including: a bubble layer; a moisture layer provided on the bubble layer and capable of absorbing moisture; pile yarn penetrating the moisture layer and fixed to the bubble layer; and a backing layer provided below the bubble layer and preventing separation of the pile yarn. Accordingly, the present invention is possible to identify suppression of a surface temperature rise of the artificial turf structure by direct sunlight by the moisture layer containing the moisture. Therefore, the present invention is possible to provide a pleasant exercise environment to users and is possible to prevent a contact burn caused by high surface temperature of the artificial turf structure.

Description

{Artificial turf composite}

The present invention relates to a synthetic turf structure.

Artificial turf is widely used for playground, landscape, etc. in place of natural grass which is difficult to cultivate and manage. Artificial turf is made of polyamide fiber pile, polypropylene fiber pile, silica sand filler system or polyethylene pile sand mat, silica sand and synthetic rubber filler.

The artificial turf structure of the related art is raised to a high temperature by direct sunlight. Especially in the summer when the amount of light is strong, it is affected more by the outside air temperature and maintains the high temperature condition continuously. This is also linked to the durability degradation of artificial turf files, leading to a curl of the file, resulting in economic losses due to additional work such as filler replenishment and brushing to restore the appearance. Therefore, there is a demand for a technique capable of suppressing the temperature rise of the artificial turf structure.

Patent Registration No. 10-1592143 (Jan. 29, 2016) Patent Registration No. 10-1770404 (2017.08.16.)

The present invention provides a technique capable of suppressing an increase in surface temperature of a synthetic turf structure.

The artificial turf structure according to an embodiment of the present invention includes a bubble layer, a water layer disposed on the bubble layer and capable of absorbing moisture, a pile fixed to the bubble layer through the water layer, And a backing layer disposed to prevent the deviation of the pile yarn.

The artificial turf structure may further include a filler layer positioned on the water layer and selected from the group consisting of silica sand, rubber chips, and combinations thereof.

The artificial turf structure may further include a fiber structure layer disposed on the upper portion or the lower portion of the water layer, and the fiber structure layer may be any one selected from a spacer woven fabric, a nonwoven fabric, and an extruded three-dimensional fiber.

The fiber structure layer may be formed of a material selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polytrimethyleneterephthalate, polyamide, polyethylene, polypropylene, Acrylic, and a combination thereof.

The water layer may be formed to have a thickness of 0.1 to 30 mm by woven or non-woven vegetable natural fibers.

The vegetable natural fiber may be cotton, hemp, coconut or biomass synthetic fiber.

The file server may include a first file and a second file that is shorter than the first file and is crimped.

The filament yarn may be any one selected from the group consisting of polyethylene, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, biomass synthetic fibers, natural fibers, and combinations thereof.

The fineness of the filament yarn may be 10 to 20,000 denier and the filament yarn length may be 10 to 75 mm.

The artificial turf structure may further include an impact absorbing pad disposed under the backing layer.

According to the embodiment of the present invention, the surface temperature rise of the artificial turf structure due to the direct sunlight is suppressed by the moisture layer containing water. Accordingly, it is possible to provide a comfortable driving environment for the users and to prevent the contact image due to the high surface temperature of the artificial turf structure.

According to the embodiment of the present invention, since the water layer also has impact absorbability, safety can be provided to the user without reducing the amount of filler layer or filling layer, and the pile yarn is tufted to the water layer so that the uprightness of the pile yarn is maintained and the buffering power is improved. In addition, since the water layer is made of natural fibers, it can show the feeling of natural grass even in the appearance part.

According to the embodiment of the present invention, the filling layer made of silica sand having a small pore size in a state where the water layer absorbs moisture blocks direct sunlight. This prevents the moisture of the water layer from vaporizing quickly, which can lower the surface temperature of the synthetic turf structure.

According to the embodiment of the present invention, the stabilization and elastic force of the artificial turf structure are increased by the filling layer made of silica sand and rubber chips.

According to the embodiment of the present invention, since the fiber structure layer exhibits buffering power, the use of the filler in the form of particles can be excluded and the cost incurred by the use of the filler material can be reduced. In addition, since the filling material is not installed at the time of constructing the artificial turf structure, the economic cost due to the installation and disposal of the artificial turf structure can be reduced.

According to the embodiment of the present invention, since the elasticity of the filling layer is prevented from being lost to the ground due to the backing layer and the material property supplement layer of the impact absorbing pad, it is possible to prevent the silica sand of the filling layer from being lost to the ground due to rainwater or the like.

According to an embodiment of the present invention, the file server includes a first file and a second file server that is shorter and crimped than the first file server. The second file is located in the first file and supports the first file. Thereby improving the uprightness of the first file.

According to the embodiment of the present invention, it can be seen that the average temperature is 20 ° C to 60 minutes after the temperature rise by 10 ° C. Therefore, it can be seen that the surface temperature rise of the artificial turf structure due to the direct sunlight is suppressed by the water layer containing moisture. Accordingly, it is possible to provide a comfortable driving environment for the users and to prevent the contact image due to the high surface temperature of the artificial turf structure.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a synthetic turf structure in accordance with an embodiment of the present invention.
2 is a schematic view of a synthetic turf structure according to another embodiment of the present invention.
3 is a schematic view of a synthetic turf structure according to another embodiment of the present invention.
FIG. 4 is a schematic view of a synthetic turf structure according to another embodiment of the present invention; FIG.
5 is a schematic view illustrating a synthetic turf structure according to another embodiment of the present invention.
6 is a schematic view of a synthetic turf structure according to another embodiment of the present invention.
FIG. 7 is a schematic view illustrating a synthetic turf structure according to another embodiment of the present invention; FIG.
8 is a graph showing changes in temperature after elevated temperatures in Examples and Comparative Examples of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like parts are designated with like reference numerals throughout the specification.

The artificial turf structure according to one embodiment of the present invention will now be described with reference to FIG.

FIG. 1 is a schematic view of an artificial turf structure according to an embodiment of the present invention.

Referring to FIG. 1, the artificial turf structure 1 according to the present embodiment includes a bubble layer 11, a water layer 12, a pile yarn 13, and a backing layer 14, do.

The bubble layer 11 forms the foundation of the artificial turf structure 1 and confer form stability. The bubble layer 11 may be formed in the form of woven fabric or nonwoven fabric. The nonwoven fabric of the bubble layer 11 may be formed by any one of a spun bond method, a meltblown method, a needle punching method, and a water diffusing method. The bubble layer 11 may be made of any one selected from the group consisting of polyethylene, polypropylene, polyester, polyamide, and combinations thereof.

The water layer 12 is disposed on the bubble layer 11 and passes through the pile yarn 13 fixed to the bubble layer 11 and is exposed to the upper side. The water layer 12 may be made in the form of a woven or nonwoven fabric. The water layer 12 may be formed to a thickness of 0.1 to 30 mm. If the thickness of the water layer 12 is less than 0.1 mm, the effect of the water layer 12 is not exhibited. If the thickness of the water layer 12 exceeds 30 mm, the manufacturing cost may increase.

The water layer 12 can be made into a sheet form using natural fibers such as cotton, hemp, and coconut. The water layer 12 may be formed by mixing natural fibers such as cotton, hemp, coconut or biomass synthetic fibers.

Here, biomass synthetic fibers are synthetic fibers made of polymers polymerized by using non-petroleum-based raw materials, and may be classified into terrestrial plant and marine plant biomass synthetic fibers. Biomass synthetic fibers and natural fibers, so that artificial turf can be manufactured more environmentally friendly.

Cotton fiber is made up of single cells consisting of short fibers of short length, which take up a large share in original products and artifacts. The constituents of the cotton fiber are layered in the form of a spiral of fiber-like fibrils in a thread-like shape to the cellulose. The structure of the spiral forms an unusual shape on the side of the cotton fiber. The side of the cotton fiber shows a twisted structure like a ribbon. The twist is formed by the evaporation of moisture when cotton yarn is blown and the cotton fiber is exposed to the air, and the spiral fibrils forming the cell layer form a twist. The fibrils of finely intertwined cellulose form a hollow (hollow) structure of the face, which makes the face a warm-feeling fiber.

Hemp fibers are often found in strings or joints that fix them rather than in doubles. The texture of the hemp fiber is composed of the epidermis, the cortex, the camphor layer, the woody part, and the grapevine, and the fiber is bonded with pectin and lignin. It has a cylindrical or flat band shape, has nodes and no natural kinks.

Coconut fiber (coir) is a fiber obtained from the fruit of coconut palm. The fruit of the coconut palm is the smoothest outermost layer of the outer layer, and the inner part of the crocus has a fibrous layer with a thickness of 2 to 5 cm. Coconut fiber is short, crude, and not very strong, but it is relatively elastic, lightweight and does not decay in water, especially in seawater. Therefore, it is widely used for rope, fish net, filler for ship, cushion, filler of mattress, and broom.

The water layer 12 is not limited to a cotton fiber, a hemp fiber, and a coconut fiber. The aqueous layer can be made of various plant natural fibers (bamboo, flax, ramie, jute, sisal).

The water layer 12 constitutes a natural fiber layer having a large hydrodynamic power, so that the increase of the surface temperature can be suppressed by the heat conduction effect of moisture of the natural fiber layer having a high water content in the high temperature environment of the summer season.

The filament yarn 13 is tufted into the bubble layer 11 and is exposed through the water layer 12 and is made of polyethylene, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, Synthetic fibers, synthetic fibers, natural fibers, and combinations thereof.

The filament yarn 13 may be formed of a monofilament, a textured filament, or the like having a fineness of 10 to 20,000 denier. The length of the pile yarn 13 may be 10 to 75 mm on the basis of the upper surface of the bubble layer 11. If the fineness of the filament yarn 13 is less than 10 denier, it may be easily damaged by an external force. If the filament yarn 13 is more than 20,000 denier, the weight of the artificial turf structure may increase together with the cost increase. If the length of the pile yarn 13 is less than 10 mm, the degree of exposure to the outside of the water layer 12 is not so high, and the artificial turf effect can not be exhibited. If the length exceeds 75 mm, the uprightness may be lowered.

A bubble layer 11 in the form of a sheet and a water layer 12 are prepared and transferred to a tufting device (not shown) in a state where the water layer 12 and the bubble layer 11 are overlapped with each other, The connected filament yarn is passed through the bubble layer 11 and the water layer 12 to form a loop and cut to form the filament yarn 13. The artificial turf structure 1 is formed by a plurality of needles by repeating such a process that the needle with the filament yarn 13 is returned to the original position again.

The backing layer 16 is formed in the form of a coating or film and prevents the filaments 13 from escaping from the bubble layer 11, thereby enhancing the stabilization of the artificial turf structure. The backing layer 16 may be formed of a polyethylene film or an ethylene-vinyl acetate copolymer (EVA) or a styrene butadiene latex (SBR latex) or polyurethane.

Accordingly, the water layer 12 can absorb moisture in the process of draining from the surface of the artificial turf structure 1 to the ground by natural rainfall or artificial watering. The moisture in the water layer 12 lowers the surface temperature of the synthetic turf structure 1. Accordingly, it is possible to provide a comfortable driving environment for the users and to prevent the contact image due to the high surface temperature of the artificial turf structure.

Next, an artificial turf structure according to another embodiment of the present invention will be described with reference to FIG.

2 is a schematic view of an artificial turf structure according to an embodiment of the present invention.

2, the artificial turf structure 2 according to the present embodiment includes a bubble layer 21, a water layer 22, a filling layer 24, a pile yarn 23 and a backing layer 26 Thereby suppressing an increase in surface temperature and enhancing the stabilization of the synthetic turf structure 2.

The constitution and action of the bubble layer 21, the water layer 22, the pile yarn 23 and the backing layer 26 according to the present embodiment are the same as those of the bubble layer, the water layer, Layers, and thus duplicate descriptions will be omitted.

The filling layer 24 is formed of silica sand to maintain the stabilization of the water layer 22 and can be installed at 30 kg / m 2 per unit area in a state where the artificial turf structure 2 is installed. When the silica sand is 30 kg / m < 2 > or more, water transfer to the surface of the water layer becomes difficult, and the surface temperature reduction effect may be lowered. The filling layer 24 made of silica sand may serve as a stable base by covering the lower pores of the grass as a whole.

The filler layer 24 is laid on the water layer 22 and the pile yarn 23 is exposed outside the filler layer 24. Silica sand is quartz grained sand containing silicon dioxide (SiO2) component which is anhydrous silicic acid. Natural quartz sand, silica sand, and synthetic quartz are used as raw materials for glass products and bricks. Silica sand is used as raw material for foundry sand, grinding sand, oxidation furnace bed, brick, etc., and SiO2 96 ~ 98% is used. Natural silica sand is formed by decomposing the granite weathered and aggregating only the quartz grains.

According to the present embodiment, the filling layer 24 made of silica sand having a small pore size in the state where the water layer absorbs moisture blocks direct sunlight. This prevents the moisture of the water layer 22 from vaporizing quickly, and thus the surface temperature of the artificial turf structure 2 can be lowered. In addition, since the backing layer 26 prevents the silica sand of the filling layer from being lost to the ground, the silica sand of the filling layer is lost due to rainwater or the like.

Many of the features shown in the embodiment shown in Fig. 1 can be applied to this embodiment.

Next, an artificial turf structure according to another embodiment of the present invention will be described with reference to FIG.

3 is a schematic view illustrating a synthetic turf structure according to another embodiment of the present invention.

Referring to FIG. 3, the artificial turf structure 3 according to the present embodiment has most of the components of the embodiment described with reference to FIG. 2. However, in this embodiment, the filling layer 34 is formed of a rubber chip instead of silica sand. Rubber chips are formed in the form of granules based on natural or synthetic rubber. The rubber chip may have a diameter of 1.4 to 3.35 mm. The specification of the rubber chip is not particularly limited.

The filling layer 34 may be installed at a rate of 1 kg / m 2 to 30 kg / m 2 per unit area in a state where the artificial turf structure 3 is installed. The filling layer 34 made of a rubber chip can increase the elastic force of the artificial turf structure. Many features of the embodiment shown in FIG. 1 and FIG. 2 can be applied to this embodiment.

Other embodiments of the present invention have most of the components of the embodiment described with reference to [Figure 1] to [Figure 3]. Accordingly, the filling layer 44 of the artificial turf structure 4 according to the present embodiment includes silica sand and a rubber chip. As shown in FIG. 4, the silica sand and the rubber chip are sequentially placed on the water layer 42. Stabilization and elasticity of the artificial turf structure 4 are increased by the filling layer 44 made of silica sand and rubber chips. Many features of the embodiment shown in FIGS. 1 to 3 can be applied to the present embodiment.

Next, an artificial turf structure according to another embodiment of the present invention will be described with reference to FIG.

5 is a schematic view illustrating a synthetic turf structure according to another embodiment of the present invention.

Referring to FIG. 5, the artificial turf structure 5 according to the present embodiment has most of the components of the embodiment described with reference to FIG. In addition, the artificial turf structure 5 according to the present embodiment further includes a fibrous structure layer 55 located above the water layer 52.

The fibrous structure layer 55 may be formed in the form of a spacer woven, nonwoven fabric or extruded three-dimensional fibrous structure having elasticity and made by a weaving or knitting method. The fibrous structure layer 55 may be formed to a thickness of 1 mm to 50 mm. The fibrous structure layer 55 may be made of any one selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyamide, polyethylene, polypropylene, acrylic, or a combination thereof. The fibrous structure layer 55 includes a surface layer, a back layer (not shown) connected to the moisture layer 52, and a surface layer (not shown) that is positioned on the top surface and an intermediate layer (not shown) .

Since the fiber structure layer 55 exerts a buffering effect, it is possible to eliminate the use of the filler in the form of particles, and the cost incurred by using the filler material can be reduced. In addition, since the filling material is not installed at the time of constructing the artificial turf structure, the economic cost due to the installation and disposal of the artificial turf structure can be reduced. Many features of the embodiment shown in FIG. 1 can be applied to the present embodiment.

Although the fibrous structure layer 55 is disposed on the bubble layer 52 in the above description and drawings, the fibrous structure layer 55 may be disposed under the bubble layer 52. The fibrous structure layer 55 may be disposed between the bubble layer 52 and the backing layer 56 or below the backing layer 56. [

Next, an artificial turf structure according to another embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a schematic view of an artificial turf structure according to another embodiment of the present invention. FIG.

6, the artificial turf structure 6 according to the present embodiment has most of the components of the embodiment described with reference to Figs. 1 to 5 (b) and is disposed below the bubble layer 61 And an impact absorbing pad (67). The impact absorbing pads 67 improve the safety performance, workability and post-installation stability of the artificial turf structure 6.

Although the shock absorbing pads 67 are shown as one layer in the drawing, they are formed of a plurality of layers. For example, a shock-absorbing pad 67 shape-stable layer (not shown), a property-regulating layer (not shown), and a property-enhancing layer (not shown). The morphology stabilizing layer, the characteristic adjusting layer and the property improving layer are sequentially laminated, and the property improving layer is connected to the bubble layer 61. On the other hand, the property-improving layer includes a backing layer 66 and a physical property-supplementing layer for preventing the silica sand of the filling layers 24 and 44 from being lost to the ground.

The detailed structure of the impact absorbing pad 67 of the artificial turf structure 6 is the same as that of the conventional impact absorbing pad and the artificial turf structure including the impact absorbing pad 67 of Patent Application No. 10-1764697 Configuration, and a detailed description will be omitted.

Many of the features of the embodiments shown in FIGS. 1 to 5 can be applied to the present embodiment.

Next, an artificial turf structure according to another embodiment of the present invention will be described with reference to FIG.

7 is a schematic view illustrating a synthetic turf structure according to another embodiment of the present invention.

Referring to FIG. 7, the artificial turf structure 7 according to the present embodiment has most of the components of the embodiment described with reference to FIGS. 1 to 6. However, the file manager 73 includes the first file 731 and the second file 732. The first file 731 and the second file 732 are exposed to the outside of the water layer 72 through the bubble layer 71 and the water layer 72 in a state of overlapping each other. Although not shown in the figure, a backing layer 76 (not shown) is provided on the lower surface of the bubble layer 71 to prevent the first bubble 731 and the second bubble 732 from being separated from the bubble layer 71 and the water layer 72 Is formed.

The second file 732 is crimped and formed shorter than the first file 731 and is located in the first file 731. The second file 732 supports the first file 731 to enhance the uprightness of the first file 731. With the improvement of the uprightness, the artificial turf structure 7 can improve the buffering force. Many of the features of the embodiment shown in FIGS. 1 to 6 can be applied to the present embodiment.

Therefore, in the process of draining rainwater, water spray, etc. from the surface of the artificial turf structure 1, 2, 3, 4, 5, 6, 7 to the ground in the water layer 12, 22, 32, 42, 52, 62, 72 Moisture is absorbed and then the sandpaper of the filling layers 24 and 44 blocks direct sunlight so as to block the vaporization of moisture in the water layer 12, 22, 32, 42, 52, 62 and 72, Lawn structures (1, 2, 3, 4, 5, 6, 7) lower the surface temperature.

Accordingly, an increase in surface temperature of artificial turf due to direct sunlight is suppressed, thereby providing a comfortable driving environment for users and preventing a contact image due to a high surface temperature. Further, since the water layer 12, 22, 32, 42, 52, 62, 72 exerts shock-absorbing property, it is possible to provide safety to the user without reducing the filling layer or filling the layer.

Since the pile yarn is tufted to the water layer 12, 22, 32, 42, 52, 62 and 72, the uprightness of the pile yarn is improved and the water layer 12, 22, 32, 42, 52, 62, And the feeling of natural grass can be continuously produced even in the appearance part.

[Test Example]

The moisture content of the artificial turf structure and the temperature change due to water retention were evaluated.

[Example]

A bubble layer 11 and a water layer 12 composed of a coarse are laminated in order to manufacture an artificial turf structure and the pile yarn 13 is formed by tufting pile yarn to the bubble layer 11 and the water layer 12 A backing layer 16 in the form of a film is formed by thermally fusing under the bubble layer 11 so that the pile yarn 13 can not be separated from the bubble layer 11. [ The artificial turf structure 1 was cut into a 250 mm x 250 mm standard to prepare sample samples.

[Comparative Example]

In order to fabricate the artificial turf structure, the water layer was omitted and the filament yarn was tufted on the bubble layer to form filament yarn, and the film backing layer was thermally fused to the bubble layer so that the filament yarn could not escape from the bubble layer. An artificial turf structure with a water layer omitted was cut to a size of 250 mm x 250 mm to prepare a comparative sample.

The samples of the artificial turf structure of Example and the artificial turf structure of Comparative Example were respectively measured and immersed in water for 3 hours.

The sample was taken out of the water, air dried in a cool place for 24 hours, and the weight of the sample after drying was measured. Then, the sample was placed in an infrared ray irradiator, heat was applied with an infrared lamp (infrared lamp: 250 W, irradiation distance: 300 mm), thermal image was photographed every 2 minutes and 30 seconds with a thermal camera, The temperature was calculated and recorded.

[Weight change]

As shown in [Table 1], it can be seen that about 20% of the water is retained in the examples after the evaluation.

[Temperature change]

It can be seen that the average temperature for 20 to 60 minutes after the temperature rise is 10 ° C lower than that of the comparative example as shown in [Fig. 8].

Therefore, it can be seen that the surface temperature rise of the artificial turf structure due to the direct sunlight is suppressed by the water layer containing moisture. Accordingly, it is possible to provide a comfortable driving environment for the users and to prevent the contact image due to the high surface temperature of the artificial turf structure.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

1, 2, 3, 4, 5, 6, 7: artificial turf structure 11, 21, 61, 71:
12, 22, 32, 42, 52, 62, 72: water layer 13, 23, 73:
731: first file 732: second file
24, 34, 44: filling layer 55: fibrous structure layer
16, 26, 56, 66, 76: backing layer 67: shock absorbing pad

Claims (10)

Bubble layer,
A water layer disposed on the bubble layer and capable of absorbing moisture,
A pile thread fixed to the bubble layer through the water layer,
A backing layer disposed below the bubble layer and preventing separation of the pile yarn,
A fiber structure layer disposed above or below the water layer and exhibiting a buffering force;
A shock absorbing pad disposed under the backing layer and formed of a plurality of layers,
/ RTI >
Wherein the water layer is a biomass synthetic fiber comprising a vegetable natural fiber woven or nonwoven fabric and the vegetable natural fiber is a polymer polymerized by using cotton, Wherein a loop yarn is passed through the bubble layer and the water layer through a pile yarn connected to a needle of a tufting device in a state where the water layer and the bubble layer are overlapped with each other, Forming the pile yarn
Artificial turf structure. The method of claim 1,
And a filling layer positioned on the water layer and being selected from the group consisting of silica sand, rubber chips, and combinations thereof. The method of claim 1,
Wherein the fibrous structure layer comprises:
A backside layer connected to the water layer,
A surface layer positioned on the back surface layer and forming an upper surface layer;
An intermediate layer connecting the surface layer and the backside layer
/ RTI >
The thickness of the fibrous structure layer is 1 mm to 50 mm
Artificial turf structure. The method of claim 1,
The fiber structure layer may be formed of a material selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polytrimethyleneterephthalate, polyamide, polyethylene, polypropylene, Acrylic, and combinations thereof. ≪ RTI ID = 0.0 > 11. < / RTI > The method of claim 1,
Wherein the water layer is formed to a thickness of 0.1 to 30 mm. delete The method of claim 1,
The file-
The first file and
A second file having a length shorter than the first file and being crimped,
/ RTI >
The first file and the second file are exposed to the outside of the water layer through the bubble layer and the water layer in a state of overlapping each other
Artificial turf structure. The method of claim 1,
The pile yarn is any one selected from the group consisting of polyethylene, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, biomass synthetic fiber, natural fiber, . 9. The method of claim 8,
Wherein the filament yarns have a fineness of 10 to 20,000 denier and a length of 10 to 75 mm. delete

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