KR101102899B1 - Artificial grass and the method of preparing the same - Google Patents

Abstract

The present invention relates to artificial turf and a method for producing the artificial turf, the artificial turf comprises a substrate and a composite pile protruding therefrom, the composite pile contains a low density polyethylene-based compound or polyvinylidene chloride-based compound and 300 to 500 A soft first monofilament yarn having a thickness of μm, a second heavy monofilament yarn containing a low density and high density polyethylene compound, and having a thickness of 200 to 300 μm, (c) a high density polyethylene compound, a polypropylene compound And a compound selected from the group consisting of nylon, and combinations thereof, and includes a hard third monofilament yarn having a thickness of 130 to 200 mu m.

Artificial turf according to the present invention is excellent in resilience, durability, and ease of maintenance, soft and natural turf piles such as natural grass does not lie on the side to prevent slipping or injury, alone or natural Can be used in combination with grass.

Artificial Turf, Monofilament, Pile, Natural Grass

Description

Artificial grass and its manufacturing method {ARTIFICIAL GRASS AND THE METHOD OF PREPARING THE SAME}

The present invention relates to artificial turf and a method of manufacturing the same, and more particularly, excellent in resilience, durability, and ease of maintenance, and soft, such as natural grass, but the pile of artificial turf does not lie sideways to prevent injury There is an effect, and relates to artificial turf and its preparation method that can be used alone or in combination with natural grass.

As the quality of life improves, the desire for a pleasant environment and the desire for health promotion are increasing day by day. Accordingly, various sports facilities such as soccer field, baseball field, tennis court, gate ball field, and multi-purpose field using artificial turf are formed in various places, and the bottom surface of such sports facility is formed of artificial turf material so that the user is more comfortable with the above facilities. There is a trend to make them available.

In general, however, artificial turf is used for 3 to 5 years and the surface of the pile is deteriorated due to factors such as ultraviolet rays and external impacts due to repeated use, the pile is broken or cut, and the rubber fillers filled between piles are severely moved or artificial turf The pile of the pile is placed sideways and receives the external force directly without buffering, the life of the artificial turf pile is shortened, causing the injury of the athlete. In addition, in order to prevent this, or regularly brushing or replenishing the rubber filler, there is a problem that a lot of maintenance costs.

In addition, until now, the artificial turf produced by one of a single monofilament yarn, a mono tape, or a fibrill yarn, there is a problem that each of the disadvantages are intact. Specifically, a pile composed solely of monofilament yarn has good durability, but loss of rubber chips is severe, and a pile composed only of fibril yarn has a small loss of rubber chip but poor durability. On the other hand, as an artificial turf that improves this point, Korean Patent Laid-Open Publication No. 10-2005-0105253 proposes turf that is tufted to bubble paper by twisting monofilament yarn and fibrils or monotape piles. The mono tape yarn is weak and easily damaged or cut, so that the quality is lower than that of a single monofilament yarn, resulting in many defects and excessive maintenance costs.

On the other hand, in order to eliminate the difference between artificial turf and natural turf, even if the life of artificial turf does not reach the maximum life of natural turf (about 100 years), it should be more than 20 years. It should be similar to a natural grass field. In addition, the maintenance method of both natural grass and artificial turf should be simple or minimized. In case of using a mixture of natural grass and artificial turf, there should be no problem in the joint part. In addition, civil engineering foundations of natural grass should be installed to grow natural grass, and for civil engineering foundations of artificial turf, ground should be firmly mixed with stone powder or gravel so that the quality of artificial turf does not decrease.

However, the artificial turf developed so far has a lot of problems compared to natural grass, the situation is constantly required to study artificial grass having a natural grass or more functions.

The present invention is excellent in resilience, durability, and ease of maintenance, and soft, such as natural grass, the file does not lie on the side to prevent injuries, artificial grass that can be used alone or in combination with natural grass It is to provide.

The present invention also provides a method for producing the artificial turf.

However, technical problems to be achieved by the present invention are not limited to the above-mentioned problems, and other technical problems will be clearly understood by those skilled in the art from the following descriptions.

According to one embodiment of the present invention, a substrate and a composite pile protruding from the composite pile, the composite pile containing a low density polyethylene-based compound or polyvinylidene chloride-based compound and has a thickness of 300 to 500㎛ 1 group consisting of monofilament yarns, heavy second monofilament yarns containing low density and high density polyethylene compounds and having a thickness of 200 to 300 μm, and high density polyethylene compounds, polypropylene compounds, nylon, and combinations thereof It provides a synthetic turf containing a compound selected from, comprising a hard third monofilament yarn having a thickness of 130 to 200㎛.

According to another embodiment of the invention, the step of spinning the first monofilament yarn forming chip, the second monofilament yarn forming chip, and the third monofilament yarn forming chip into each spinning machine, spinning Cooling the first soft monofilament yarn having a thickness of 300 to 500 μm, the second heavy monofilament yarn having a thickness of 200 to 300 μm, and the hard third monofilament yarn having a thickness of 130 to 200 μm Manufacturing an artificial turf comprising the steps of: forming a composite pile by combining the cooled first, second, and third filament yarns; and forming the composite pile on a substrate and backing the composite pile. Provide a method.

The artificial turf of the present invention has excellent restoring force and durability by using three kinds of monofilament yarns having different physical properties. In addition, soft, like natural grass, the file does not lie on its side to prevent slipping or injury, reduces skin resistance, costs little maintenance, and can be used alone or in combination with natural grass. In addition, it is economical and environmentally friendly because it can be manufactured by recycling waste plastic chips or waste artificial grass.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, by which the present invention is not limited and the present invention is defined only by the scope of the claims to be described later.

Unless otherwise specified herein, low density polyethylene means polyethylene having a melt index of 0.2 to 50 g / min, a density of 0.910 to 0.925 g / cm ² and a crystallinity of 40 to 50%, and high density polyethylene The term "polyethylene" has a melt index of 0.2 to 50 g / min, a density of 0.941 to 0.965 g / cm ² , and a crystallinity of 60 to 80%.

1 is a cross-sectional view schematically showing a cross section of the artificial turf according to an embodiment of the present invention. Hereinafter, the artificial turf according to the embodiment of the present invention will be described in detail with reference to FIG. 1.

Referring to Figure 1, the artificial turf 100 of the present invention includes a substrate 110 and a composite pile 120 protruding therefrom, the composite pile is a soft first monofilament yarn 121, heavy A second monofilament yarn 122, and a hard third monofilament yarn 123.

The soft first monofilament yarn contains a low density polyethylene-based compound or a polyvinylidene chloride-based compound and has a thickness of 300 to 500 µm. When the thickness of the soft first monofilament yarn is within the above range, it is less affected by external forces, thereby reducing the breakdown of artificial turf due to cracks, and having excellent elasticity and flexibility for a long time.

The low density polyethylene (LDPE) -based compound is preferably included in 70% by weight or more, more preferably 75 to 80% by weight based on the total amount of the first monofilament yarn. When the content of the low-density polyethylene compound is in the above range, there is an advantage of excellent flexibility and reduction of destruction of artificial turf due to external force. In this case, the remaining amount may include a high density polyethylene (HDPE) -based compound, a sunscreen, a heat insulating material, a natural pigment or a natural flavor, in which case the high-density polyethylene-based compound is 2 to the total amount of the first monofilament yarn It is more preferably contained in 10% by weight.

In addition, when the first monofilament yarn is a polyvinylidene chloride-based compound, it may further include a small amount of plasticizer, and typically, a plasticizer such as dioctylphthalate may be used, but is not limited thereto. The plasticizer may be added in an amount of 1 to 2 wt% based on the total amount of the first monofilament yarn.

The first monofilament yarn may have a shape similar to a leaf of grass, in which case the width is preferably 1 mm or less, and more preferably 0.85 to 0.95 mm. When the width of the first monofilament yarn is in the above range, there is an advantage in that the restoring force is excellent even when repeated use for a long time.

In addition, the cross section of the first monofilament yarn may be a square, a lozenge, or a double-lens type, and the cross-sectional shape of the first monofilament yarn is not particularly limited.

The first monofilament yarn containing the low density polyethylene-based compound or polyvinylidene chloride-based compound is less affected by temperature, ultraviolet rays, and external forces, so that destruction of artificial turf due to cracking does not occur well, and elasticity and flexibility It can be maintained for a long time to maintain a good resilience for a long time. In addition, it can be manufactured using recycled waste plastic or waste artificial turf, which can be expected to reduce costs.

The heavy second monofilament yarn contains a low density polyethylene-based compound and a high density polyethylene-based compound and has a thickness of 200 to 300 µm. When the thickness of the heavy second monofilament yarn is in the above range, it may exhibit appropriate hardness and flexibility, and may be able to maintain wear resistance for a long time.

The second monofilament yarn may include a low density polyethylene-based compound and a high density polyethylene-based compound in a weight ratio of 6: 4 to 4: 6, and more preferably 55:45 to 50:50. When the composition of the low density and high density polyethylene compound is in the above range, it is preferable to exhibit appropriate hardness and flexibility, and to maintain wear resistance for a long time.

The second monofilament yarn may have a shape similar to a leaf of grass, in which case the width is preferably 1.1 mm or less, and more preferably 0.95 mm to 1.05 mm. When the width of the second monofilament yarn is in the above range, the restoring force is excellent and there is an advantage of preventing the movement of the rubber chip.

The second monofilament yarn is a yarn reflecting the current trend of artificial turf, has an appropriate hardness and flexibility, and has the advantage of maintaining wear resistance for a long time.

The hard third monofilament yarn has a thickness of 130 to 200 μm or less, and may include one selected from the group consisting of high density polyethylene compounds, polypropylene compounds, nylon, and combinations thereof.

When the thickness of the hard third monofilament yarn is in the above range, the durability is excellent and the movement of the rubber chip may be prevented. However, if it is less than 130㎛ there is a problem that the durability is lowered, if it exceeds 200㎛ there is a problem that the movement of the rubber chip is severe, which is not preferable.

The high density polyethylene-based compound is preferably contained in 70% by weight or more, more preferably in the 75 to 80% by weight relative to the total amount of the third monofilament yarn. In addition, the amount of the balance may include a low density polyethylene compound, a sunscreen agent, a heat insulating material, a natural pigment, a natural flavor, or a combination thereof, and in the case of the low density polyethylene compound, the total amount of the third monofilament yarn is 5 It is more preferably contained in 10% by weight.

The third monofilament yarn may have a shape similar to a leaf of grass, in which case the width is preferably 2 mm or less, and more preferably 1.45 to 1.55 mm. If the width of the third monofilament yarn is in the above range, there is an advantage that can prevent the movement of the rubber chip without dense tufting.

The third monofilament yarn is inserted between the first monofilament and the second monofilament to increase the thickness of the artificial turf and to reduce the fluidity and loss of the rubber chip. In addition, although the third monofilament yarn may be slightly laid down over time, wear resistance may decrease, but the third monofilament yarn is protected from abrasion from the first and second monofilament yarns. In addition, the third monofilament yarn is also excellent in wear resistance due to its high hardness.

It is preferable that the thickness difference of the said 1st monofilament yarn and the 2nd monofilament yarn is 100-300 micrometers, and the thickness difference of the 2nd monofilament yarn and the 3rd monofilament yarn is 50-170 micrometers. In addition, the second monofilament yarn is preferably 5 to 15% higher hardness than the first monofilament yarn, the third monofilament yarn is preferably 5 to 15% higher hardness than the second monofilament yarn. When the thickness and hardness difference of the first, second, and third monofilament yarns are within the above ranges, the elasticity, flexibility, and wear resistance are all excellent.

In addition, the length of the long axis of the first, second, third monofilament yarn is preferably 30 to 65mm, it can function as an artificial turf when the height is in the above range.

Artificial turf according to an embodiment of the present invention includes all of the first, second, and third monofilament yarns having different flexibility and hardness, thereby reducing the wear phenomenon of each yarn caused by the impact from the outside. Each yarn has excellent resilience. In addition, the grass lying on the side hardly occurs, so that the friction of the skin can be reduced to prevent burns and imaging. In addition, the artificial turf has an advantage of superior durability compared to the artificial turf including all three types of yarns are monofilament yarns including fibrils.

Preferably, the composite pile may include each monofilament yarn such that the total of the first, second, and third monofilament yarns is six strands. In addition, it is possible to include all forms such as two strands each, included in the number ratio of 4: 1: 1, contained in the number ratio of 1: 4: 1, and included in the number ratio of 1: 1: 1. If the number of monofilament yarns in the composite pile exceeds 6, the hook, knife, or needle of the weaving machine is subject to high damage and must be replaced frequently, and if it is less than the above range, the artificial grass has a low weaving speed and density. There is a problem that the quality of the falling is not preferable.

The substrate 110 may be used without limitation as long as it is commonly used in the manufacture of artificial grass, and preferably may be in the form of bubble paper.

2 is a cross-sectional view showing an artificial turf according to an embodiment of the present invention, as shown in FIG. 2, a silica sand layer 130 may be formed on the substrate, and a rubber chip or a nylon crimp yarn layer 140 is formed thereon. It may be formed further.

In addition, the artificial turf can be used in combination with natural grass.

When the artificial turf is used in combination with natural grass, it is preferable to attach an elastic rubber pad to the lower portion of the artificial turf so that the mutual turbulence does not occur. In addition, it is possible to prevent the discontinuity in the joint part by various known methods.

When using a mixture of artificial grass and natural grass, artificial turf and natural grass may be alternately formed at regular intervals, more preferably 4 to 28m spaced alternately. Specific examples of this method include artificial grass inside the penalty line or goal line, natural grass in the outside area, alternating natural grass and artificial turf alternately at intervals of 4 to 28 m in the length direction of the stadium. It may be mentioned, but this is only an example and is not limited thereto.

According to another embodiment of the present invention, a method for manufacturing the artificial turf may be provided. Figure 3 is a process chart showing a method for manufacturing artificial turf according to another embodiment of the present invention. Referring to FIG. 3, the method of manufacturing artificial turf comprises spinning a first monofilament yarn forming chip, a second monofilament yarn forming chip, and a third monofilament yarn forming chip into each of the radiators (S10). ), A soft first monofilament yarn having a thickness of 300 to 500 μm, a heavy second monofilament yarn having a thickness of 200 to 300 μm, and a hard third monofilament yarn having a thickness of 130 to 200 μm Cooling step (S20), the step of sintering the cooled first, second, and third filament yarn to form a composite pile (S30), and forming the composite pile on the substrate and backing to manufacture artificial grass Step S40 is included.

First, a step of spinning the first monofilament yarn forming chip, the second monofilament yarn forming chip, and the third monofilament yarn forming chip into each radiator is performed (S1).

As the chip for forming the first monofilament yarn, one containing a low density polyethylene compound or a polyvinylidene chloride compound may be used, which is the same as described above. However, when the first monofilament yarn forming chip contains a polyvinylidene chloride-based compound, it is more preferable to add a plasticizer to form a soft yarn.

As the chip for forming the second monofilament yarn, one containing a low density and high density polyethylene-based compound may be used, which is the same as described above.

The third monofilament yarn forming chip may include a compound containing a compound selected from the group consisting of a high density polyethylene compound, a polypropylene compound, nylon, and a combination thereof, which is the same as described above.

In addition, when the first, second, third monofilament yarn forming chips are put into the radiator, respectively, in the group consisting of a sunscreen, heat insulating material, restoring power increasing material, natural flavors, natural pigments, artificial pigments, and combinations thereof The selected additive may be further added, and the additive may be added in a small amount in a range that does not impair the desired physical properties, so it is not necessary to limit the content, preferably 100 parts by weight of each monofilament yarn In an amount of 1 to 1.5 parts by weight .

In addition, when using an artificial pigment as an additive, it is preferable to use an artificial artificial pigment.

The first, second and third monofilament yarn forming chips may be heat-treated.

Next, the step of cooling the first, second, and third filament yarn spun (S2). The process of cooling the spun first, second and third filament yarns can be carried out under conventionally known conditions.

Thereafter, the cooled first, second, and third filament yarns are fused to form a composite pile (S3).

The composite pile is formed by plying the first monofilament yarn, the second monofilament yarn, and the third monofilament yarn, and preferably, the sum of the first monofilament yarn, the second monofilament yarn, and the third monofilament yarn. It may be formed by plying to form six strands, but is not limited thereto. Specifically, the first, second, and third monofilament yarns each include two strands, are included in the number ratio of 4: 1: 1, or are included in the number ratio of 1: 4: 1, or 1: 1: 4. All included in the number ratio is possible. If the number of monofilament yarns in the composite pile exceeds the above range, the hook, knife, or needle of the weaving machine should be replaced frequently because of excessive force, and if it is less than the above range, the artificial grass will have low weaving speed and density. There is a problem that the quality of the falling is not preferable.

Thereafter, the composite pile is formed on the substrate and backing is performed to manufacture artificial turf (S4).

The description is the same as described above.

Examples of the method of forming the composite pile on the substrate include but are not limited to a method of tufting the composite pile, a weaving method, a moquette method, and a lamination method.

The backing process may be performed by coating the bottom surface of the substrate with a polyurethane resin, an acrylic resin, styrene-butadiene-rubber, or a mixture thereof, but is not limited thereto.

For the purpose of illustrating the present invention in more detail with reference to the following examples and comparative examples, the following examples are for the purpose of explanation and are not intended to limit the invention.

< Example  1>

The first monofilament yarn forming chip comprising a low density polyethylene compound and a high density polyethylene compound in a weight ratio of 7: 3 as the spinning polymer, the second monofilament yarn comprising a weight ratio of 5: 5, a low density polyethylene compound and a high density polyethylene compound in a weight ratio of 5: 5 200 g of chips for forming and 200 g of chips for forming a third monofilament yarn containing a low density polyethylene compound and a high density polyethylene compound in a weight ratio of 3: 7 were put into a spinning machine, respectively, and spun with a thickness of 450 µm, 250 µm and 150 µm, respectively. And cooled at 20 ° C. to produce first, second, and third monofilament yarns. Thereafter, the cooled first, second, and third monofilament yarns were spun together in a ratio of 2: 2: 2. After the composite pile is formed, the composite pile is tufted into a polypropylene bubble paper, and then backed with styrene-butadiene rubber (SBR) latex It was prepared in the grass.

< Example  2>

An artificial turf was produced in the same manner as in Example 1 except that 200 g of the first monofilament yarn forming chip containing the low density polyethylene compound and the high density polyethylene compound in a weight ratio of 7: 3 was changed to 200 g of polyvinylidene chloride. Prepared.

< Comparative example  1>

An artificial turf was prepared in the same manner as in Example 1 except that the thickness of the third monofilament yarn was changed to 120 μm.

< Comparative example  2>

An artificial turf was prepared in the same manner as in Example 1 except that the thickness of the third monofilament yarn was changed to 90 μm.

< Comparative example  3>

An artificial turf was produced in the same manner as in Example 1 except that the composite pile was formed by combining the second and third monofilament yarns in a number ratio of 3: 3 without using the first monofilament yarns. .

< Comparative example  4>

An artificial turf was prepared in the same manner as in Example 1 except that the composite pile was formed by combining the first and third monofilament yarns in a number ratio of 3: 3 without using the second monofilament yarns.

< Comparative example  5>

An artificial turf was produced in the same manner as in Example 1 except that the composite pile was formed by combining the first and second monofilament yarns in a number ratio of 3: 3 without using the third monofilament yarn.

< Comparative example  6>

An artificial turf was prepared in the same manner as in Example 1 except that the composite pile was formed using only six strands of the second monofilament yarn without using the first and third monofilament yarns.

< Comparative example  7>

Without using the first monofilament yarn forming chip, the first and second monofilament yarn thickness fibers were made of the second monofilament yarn forming chip, and the third monofilament yarn forming chip was manufactured. The artificial turf was prepared in the same manner as in Example 1 except that the composite pile was formed by plying three monofilament yarns with a ratio of 2: 2: 2.

< Comparative example  8>

Without using the second monofilament yarn forming chip, fibers of the second and third monofilament yarn thickness were manufactured with the third monofilament yarn forming chip, and the first monofilament yarn forming chip was manufactured. Synthetic grass was prepared in the same manner as in Example 1 except that the composite pile was manufactured by combining the monofilament yarn with a number ratio of 2: 2: 2.

< Experimental Example >

For each artificial turf prepared in Examples 1 to 3 and Comparative Examples 1 to 8, elasticity (resilience), flexibility (skin resistance) and abrasion resistance were measured, and among the examples 1 to 2 and Comparative Examples 1 to 8, The results are shown in Table 1 below. The measurement method was based on 1,000 cycle repeated use.

[Table 1]

Referring to Table 1, the artificial turf of Examples 1 and 2 manufactured using the first, second, and third monofilament yarns having a specific thickness and a specific hardness is elastic even when used repeatedly 1,000 times in comparison with the initial value. , Flexibility, and abrasion resistance were all excellent, and the same level of results were obtained for Example 3 as well.

On the other hand, in the artificial turf of Comparative Examples 1 and 2 manufactured by using the hard third monofilament yarn outside the thickness range of the present invention, a part of the third monofilament yarn was damaged on the surface, and the soft first monofilament Artificial grass of Comparative Example 3 prepared without using yarn, artificial turf of Comparative Example 4 manufactured without using heavy second monofilament yarn, and comparative example prepared without using hard third monofilament yarn Although the artificial turf of 5 was all excellent in wear resistance, elasticity and flexibility were remarkably low, and in particular, it was confirmed that the elasticity and flexibility of the artificial turf of Comparative Example 3 manufactured without using a soft first monofilament yarn were further reduced. Could.

In addition, the artificial turf of Comparative Example 6 prepared using only the first monofilament yarn and the third hard monofilament yarn and not the second heavy monofilament yarn also exhibited low elasticity and was particularly flexible. It was confirmed that this is seriously degraded.

On the other hand, without using a chip for forming the first monofilament yarn, a comparative example in which the fibers of the first and second monofilament yarns are manufactured with the chip for forming the second monofilament yarn, and then plyed together with the third monofilament yarn The artificial turf of 7 showed excellent elasticity and flexibility compared to the artificial turf of Comparative Examples 1 to 6, but it was confirmed that the elasticity and flexibility were lower than those of the artificial turf of Examples 1 and 2. In addition, the second monofilament yarn forming chips without using the second monofilament yarn forming chips, and the second and third monofilament yarns produced fibers of the thickness of the comparative example in which it was plyed together with the first monofilament yarns The artificial turf of 8 was superior in elasticity and flexibility to the artificial turf of Comparative Examples 1 to 6, but it was confirmed that the elasticity and flexibility were lower than those of the artificial turf of Examples 1 and 2.

From this, the first monofilament yarn functions excellent in maintaining elasticity, flexibility, and durability, the second monofilament yarn improves flexibility and wear resistance, and the third monofilament yarn is the performance of the first monofilament yarn and the second monofilament yarn. It is supported to be maintained, and serves to prevent the movement or loss of the rubber chip.

Therefore, the artificial turf of the present invention has excellent elasticity, flexibility, and wear resistance, and it can be confirmed that this is realized by an optimized combination of the first, second, and third monofilament yarns having a specific thickness and a specific hardness.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a cross-sectional view showing a cross section of the artificial turf according to an embodiment of the present invention.

2 is a cross-sectional view showing a cross section of the artificial turf according to an embodiment of the present invention.

3 is a process chart showing a method for manufacturing artificial turf according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: artificial turf

110: description

120: compound file

121: first monofilament yarn

122: second monofilament yarn

123: third monofilament yarn

130: silica sand layer

140: rubber chip layer or nylon crimp yarn layer

150: artificial turf substrate

Claims (14)

It includes a substrate and a composite pile protruding therefrom, The compound file, A soft first monofilament yarn containing a low density polyethylene compound or a polyvinylidene chloride compound and having a thickness of 300 to 500 µm; A heavy second monofilament yarn containing low density and high density polyethylene-based compounds and having a thickness of 200 to 300 µm; And A hard third monofilament yarn containing a compound selected from the group consisting of high density polyethylene compound, polypropylene compound, nylon, and combinations thereof, and having a thickness of 130 to 200 μm. Artificial turf comprising a. The method of claim 1, The soft first monofilament yarn contains 70% by weight or more of a low density polyethylene compound, and is selected from the group consisting of a high density polyethylene compound, a sunscreen agent, a heat insulating material, a natural pigment, a natural perfume, and a combination thereof in the remaining amount. Artificial turf containing the thing. The method of claim 1, The heavy second monofilament yarn artificial turf, characterized in that it comprises a low density polyethylene compound and a high density polyethylene compound (high density polyethylene, HDPE) in a weight ratio of 6: 4 to 4: 6. The method of claim 1, The hard third monofilament yarn contains 70% by weight or more of a high density polyethylene compound, and is selected from the group consisting of a low density polyethylene compound, a sunscreen agent, a heat insulating material, a natural pigment, a natural perfume, and a combination thereof in the balance. Artificial turf, characterized by containing. Artificial turf according to any one of claims 1 to 4 characterized in that the artificial turf used in combination with natural grass. The artificial turf according to any one of claims 1 to 4, wherein the artificial turf is formed alternately with natural grass and spaced at a predetermined interval. The method of claim 6, The artificial turf and natural turf is artificial turf, characterized in that formed alternately spaced 4 to 28m. Inserting the first monofilament yarn forming chip, the second monofilament yarn forming chip, and the third monofilament yarn forming chip into each of the radiators; Cooling the soft first monofilament yarn having a thickness of 300 to 500, the second heavy monofilament yarn having a thickness of 200 to 300, and the hard third monofilament yarn having a thickness of 130 to 200 step; Plying the cooled first, second, and third filament yarns to form a composite pile; And Forming the composite pile on the substrate and backing to produce artificial grass Method for producing artificial turf comprising a. The method of claim 8, The first monofilament yarn forming chip comprises a low density polyethylene-based compound or polyvinylidene chloride-based compound manufacturing method of the artificial turf. 10. The method of claim 9, The first monofilament yarn forming chip contains 70% by weight or more of a low density polyethylene-based compound, and in the group consisting of a high-density polyethylene-based compound, a sunscreen, a heat insulating material, a natural pigment, a natural perfume, and a combination thereof in the remaining amount. A method for producing artificial turf, comprising the one selected. The method of claim 8, The second monofilament yarn forming chip comprises a low density polyethylene compound and a high density polyethylene compound (HDPE) 40: 60 to 60: 40 of the artificial turf, characterized in that it comprises a weight ratio. The method of claim 8, The third monofilament yarn forming chip is a method for producing artificial turf, characterized in that it contains a compound selected from the group consisting of high density polyethylene compound, polypropylene compound, nylon, and combinations thereof. The method of claim 12, The third monofilament yarn forming chip contains 70% by weight or more of a high density polyethylene compound, and is selected from the group consisting of a low density polyethylene compound, a sunscreen agent, a heat insulating material, a natural pigment, a natural perfume, and a combination thereof in the remaining amount. Method for producing artificial turf, characterized in that it contains. The method of claim 8, In the step of inserting the first monofilament yarn forming chip, the second monofilament yarn forming chip, and the third monofilament yarn forming chip into each of the radiators, a sunscreen, a heat insulating material, a restoring force increasing material, a natural perfume, a natural pigment , Artificial pigment, and a method for producing artificial turf, characterized in that further adding an additive selected from the group consisting of a combination thereof.

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