JP7073660B2 - Artificial turf - Google Patents

Description

The present invention relates to artificial turf and a method for producing the same.

In recent years, artificial turf has become widespread in various athletic facilities such as soccer fields, rugby fields, and baseball fields. In many cases, such artificial turf is produced by planting a large number of piles imitating turf leaves on a substrate. And, as artificial turf has become widespread, various functions such as texture, durability, workability, etc. similar to natural turf have been required for artificial turf, and as a device to realize further functions, An artificial turf in which a linear pile (hereinafter, straight pile) is combined with a crimped pile (hereinafter, crimped pile) has been proposed (see Patent Documents 1 and 2). In Patent Document 1, the straight pile is made of polyethylene, and the crimp pile is made of nylon 66. Further, in Patent Document 2, the straight pile is made of polypropylene, and the crimp pile is made of nylon 6.

Japanese Unexamined Patent Publication No. 2014-47596 Japanese Unexamined Patent Publication No. 2010-248802

As described above, in Patent Documents 1 and 2, the straight pile and the crimp pile are different materials. Therefore, there is a difference in the progress rate of these piles such as light resistance deterioration and water immersion deterioration, and only one pile is deteriorated due to aging, and the appearance of the artificial turf is different from that at the initial stage of use. In addition, when the crimp pile is composed of nylon-based material and the straight pile is composed of polyethylene, the nylon-based material is inferior to polyethylene in terms of water resistance, so the turf leaves of the crimp pile. It can also lead to a situation where the turf is worn out or torn.

The present invention is to provide an artificial turf capable of maintaining its appearance for a long period of time and a method for producing the same.

The artificial turf according to the first aspect of the present invention includes a base material having a front surface and a back surface, and a large number of piles imitating turf leaves standing on the surface of the base material. The large number of piles includes straight piles and crimp piles. The straight pile and the crimp pile are made of polyethylene. When the total fineness of the straight pile is S1 and the total fineness of the crimp pile is S2, 1.0 ≦ S1 / S2 ≦ 1.5.

The artificial turf according to the second aspect of the present invention is the artificial turf according to the first aspect, and the straight pile and the crimp pile are made of the same polyethylene material.

The artificial turf according to the third aspect of the present invention is the artificial turf according to the first aspect or the second aspect, and the straight pile and the crimp pile are planted at the same planting place on the substrate. ing.

The artificial turf according to the fourth aspect of the present invention is the artificial turf according to any one of the first aspect to the third aspect, and 1.2 ≦ S1 / S2.

The method for producing artificial turf according to the fifth aspect of the present invention includes the following steps.
(1) A step of manufacturing a straight yarn composed of polyethylene.
(2) A step of manufacturing a crimped yarn composed of polyethylene.
(3) The group including a straight pile and a crimp pile that imitate turf leaves formed from the straight yarn and the crimp yarn by planting the straight yarn and the crimp yarn on a base material, respectively. In the step of manufacturing the intermediate of the artificial turf having a large number of piles standing on the surface of the material, when the total fineness of the straight pile is S1 and the total fineness of the crimped pile is S2, 1 .. Step of manufacturing the intermediate so that 0 ≦ S1 / S2 ≦ 1.5.
(4) A backing agent is applied to the back surface of the base material contained in the intermediate to prevent the pile from falling off from the base material, and the backing agent is applied to a high temperature environment lower than the melting point of the crimped yarn. Step to dry underneath.

The method for producing artificial turf according to the sixth aspect of the present invention is the method for producing artificial turf according to the fifth aspect, and the crimped pile has a narrower cross-sectional area than the straight pile.

The method for producing artificial turf according to the seventh aspect of the present invention is the method for producing artificial turf according to the fifth or sixth aspect, and the crimped pile has a lower turf length than the straight pile.

The method for producing artificial turf according to the eighth aspect of the present invention is the method for producing artificial turf according to any one of the fifth to seventh aspects, and the step of drying the backing agent in (4) is described above. This is a step of drying the backing agent in a high temperature environment of 100 ° C. or higher.

According to the present invention, the turf leaves of artificial turf are formed by at least two types of piles, a straight pile and a crimped pile. Therefore, it is possible to realize a natural texture similar to that of natural turf. Further, both the straight pile and the crimp pile are made of polyethylene. Therefore, not only the straight pile and the crimp pile each have a relatively long life, but also the rate of deterioration of both is relatively the same. Further, when 1.0 ≦ S1 / S2 ≦ 1.5, the durability is further improved. As a result, the appearance of the artificial turf is maintained for a long period of time.

The side view of the artificial turf which concerns on one Embodiment of this invention.

Hereinafter, the artificial turf and the method for producing the artificial turf according to the embodiment of the present invention will be described with reference to the drawings.

<1. Artificial turf>
The artificial turf 1 according to the present embodiment is installed on an installation surface such as an asphalt surface or the ground in various athletic facilities such as a soccer field, a rugby field, and a baseball field. As shown in FIG. 1, the artificial turf 1 has a base material 2 and a large number of piles 3 imitating turf leaves standing on the surface 2a of the base material 2. The base material 2 is formed in a sheet shape, and the pile 3 is planted on the base material 2 at predetermined intervals. Further, a backing layer 4 for preventing the pile 3 from falling off from the base material 2 is formed on the back surface 2b of the base material 2.

The pile 3 on the substrate 2 contains different types of piles. In the present embodiment, two types of piles are planted on the base material 2, one of which is a linear pile (straight pile) 31 and the other of which is a crimped pile (crimped pile). 32. The straight pile 31 does not have to extend completely in a straight line and may be curved to some extent (including bending), but the degree of bending referred to here is the degree of bending slightly due to its own weight or the like. means. On the other hand, the crimp pile 32 has a shape curved (including bending) in various directions even when no external force is applied.

In the artificial turf 1, the combination of the straight pile 31 and the crimped pile 32 realizes a natural texture similar to that of natural turf. Further, the crimp pile 32 acts like a spring to support the straight pile 31 and prevent the straight pile 31 from falling down. Therefore, also in this sense, the appearance of the artificial turf 1 is improved by the combination of the crimp pile 32 and the straight pile 31.

The material and form of the base material 2 are not particularly limited, but for example, the base material 2 can be formed as a plain weave cloth made of a resin material. Of course, it can also be formed as a twill cloth. As the resin material, a thermoplastic resin such as polypropylene or polyethylene can be typically selected.

The material of the backing layer 4 is also not particularly limited, but for example, the backing layer 4 can be made of SBR latex, acrylic resin, urethane resin, a composite product thereof, or the like. The backing layer 4 may be omitted.

The straight pile 31 is made of polyethylene. Further, in the present embodiment, the straight pile 31 is formed by using a monofilament yarn (yarn), but of course, it can also be formed by using a multifilament yarn (yarn). The straight pile 31 of the present embodiment is fixed to the base material 2 by sewing a yarn to be the straight pile 31 into the base material 2 using a tufting machine. The length L1 (average value) from the surface 2a of the base material 2 to the tip of the straight pile 31 is not particularly limited, but can be relatively short as 20 mm ≦ L1 <50 mm (generally called a short pile). It can also be relatively long, 50 mm ≤ L1 ≤ 70 mm (generally called a long pile). However, it is preferable that 15 mm ≦ L1 ≦ 40 mm. The straight pile 31 tilts more or less on the base material 2 due to its own weight or the like, but L1 here is the length when the straight pile 31 is stretched in a straight line. Further, the straight pile 31 of the present embodiment is flat, but the cross-sectional shape of the straight pile 31 is various such as an elliptical shape, a hollow shape, a continuous thread shape, and an irregular shape (for example, a triangle, a quadrangle, and a star shape). It can be shaped. The cross section of the pile 3 means a cross section on a plane orthogonal to the extending direction of the turf leaves.

On the other hand, the crimp pile 32 is also made of polyethylene like the straight pile 31. In particular, in the present embodiment, the straight pile 31 and the crimp pile 32 are made of the same polyethylene material. The term "same polyethylene material" as used herein means that the density, melting point, composition, and composition of the corrosion-resistant stabilizer, pigment, and the like are the same or substantially the same. In the present embodiment, the crimp pile 32 is also formed by using a monofilament yarn (yarn), but of course, it can also be formed by using a multifilament yarn (yarn). Further, the crimp pile 32 of the present embodiment is also fixed to the base material 2 by sewing the yarn to be the crimp pile 32 into the base material 2 using a tufting machine. The length L2 (average value) from the surface 2a of the base material 2 to the tip of the crimp pile 32 is not particularly limited, but is preferably 15 mm ≦ L2 ≦ 40 mm, and in the present embodiment, the length of the straight pile 31. It is the same as L1. Although the crimp pile 32 is crimped, L2 here is the length when the crimp pile 32 is stretched in a straight line. Further, "identical" here does not mean only that L1 and L2 are completely the same, but allows an error within ± 5%. Further, although the crimp pile 32 of the present embodiment is flat, the cross-sectional shape of the crimp pile 32 is also an elliptical shape, a hollow shape, a continuous thread shape, an irregular shape (for example, a triangle, a quadrangle, a star shape) or the like. It can have various shapes.

The straight pile 31 and the crimp pile 32 do not necessarily have to be composed only of polyethylene, and may contain a material other than polyethylene. In the present embodiment, when it is said that a specific part such as a straight pile 31, a crimp pile 32, a base material 2, a backing layer 4 and the like is "composed of (specific material)", most of the parts are made of the material. It means that it is composed, and quantitatively, it means that the weight percent W of the material at the site is 50% or more. From the viewpoint of increasing the strength of the pile 3, the weight percent W of the polyethylene of the pile 3 is preferably 60% or more, more preferably 70% or more, further preferably 80% or more, and 90%. It is more preferably% or more, and even more preferably 95% or more.

Here, the turf length (average value) of the straight pile 31 is H1, and the turf length (average value) of the crimp pile 32 is H2. At this time, in this embodiment, H1> H2. Note that H1 is the height (average value) from the surface 2a of the base material 2 to the highest point of the straight pile 31 when no external force (excluding its own weight) is applied to the artificial turf 1, and is H2. Is the height (average value) from the surface 2a of the base material 2 to the uppermost point of the crimp pile 32 in the same state. Further, in the present embodiment in which L1 and L2 are the same, H2 / H1 ≦ 3/4 is preferable, and H2 / H1 ≦ 2/3 is more preferable. As the value of H2 / H1 becomes smaller, the crimping pile 32 becomes more crimped, the turf length of the crimping pile 32 becomes lower than that of the straight pile 31, and the crimping pile 32 firmly presses the lower part of the straight pile 31. Because you will be able to support it. On the other hand, if the value of H2 / H1 becomes too small, the crimped pile 32 may be in a state of supporting only the root of the straight pile 31, so that H2 / H1 ≧ 1/4 is preferable, and H2 / H1 ≧. It is more preferably 1/3, and even more preferably H2 / H1 ≧ 1/2. When the above numerical range is satisfied, the lodging of the straight pile 31 is more effectively suppressed.

Further, when the area (average value) of the cross section of the straight pile 31 is A1 and the area (average value) of the cross section of the crimp pile 32 is A2, A1> A2 in this embodiment. Further, A1 / A2> 1.5 is more preferable, A1 / A2> 2 is more preferable, A1 / A2> 2.5 is further preferable, and A1 / A2> 3.0. It is more preferable to have. That is, as the value of A1 / A2 becomes larger, the crimp pile 32 becomes thinner than the straight pile 31, and the crimping process can be facilitated.

In the present embodiment, both the straight pile 31 and the crimp pile 32 are planted at each planting point P1 on the base material 2. In the example of FIG. 1, six straight piles 31 and 16 crimp piles 32 are planted at the same planting point P1. That is, the pile 3 at one planting point P1 is composed of 6 straight piles 31 and 16 crimp piles 32. However, the total number of piles 3 at the same planting point P1 and the respective numbers of straight piles 31 and crimped piles 32 at the same planting point P1 can be appropriately changed.

Further, when the total fineness of the straight pile 31 is S1 and the total fineness of the crimp pile is S2, 1.0 ≦ S1 / S2 ≦ 1.5. The total fineness of the pile 3 is a value obtained by multiplying the fineness of each pile 3 by the number of piles 3 per plant (half the amount of pile 3 standing up from the planting point P1 of 1). Further, the fineness per pile 3 means the weight per unit length of the pile 3. That is, when 1.0 ≦ S1 / S2, the amount of the straight pile 31 with respect to the crimp pile 32 is secured. As a result, the straight pile 31 is relatively thick or has a large number, and the appearance of the artificial turf 1 is improved. In addition, the straight pile 31 is less likely to fall down due to repeated treading by a player or the like, and the durability of the artificial turf 1 is also improved. On the other hand, since S1 / S2 ≦ 1.5, the amount of the crimped pile 32 with respect to the straight pile 31 is secured, and the straight pile 31 is less likely to fall down even by repeated treading by a player or the like, and the artificial turf 1 is used. Both appearance and durability are improved.

Further, it is preferable that S1 <6000 decitex (dtex) per plant (half the amount of each of the piles 31 and 32 rising from the planting point P1 of 1), and more preferably 500 dtex ≦ S1 ≦ 5900 dtex ≦ 4000 dtex ≦. It is more preferable that S1 ≦ 5900 dtex. Further, per share, 300 dtex ≦ S2 ≦ 8000 dtex is preferable, 300 ≦ S2 ≦ 6000 dtex is more preferable, and 2000 dtex ≦ S2 ≦ 5500 dtex is more preferable.

The width of the cross section of the straight pile 31 is W1, the thickness of the cross section of the straight pile 31 is D1, the width of the cross section of the crimp pile 32 is W2, and the thickness of the cross section of the crimp pile 32 is D2. .. The width W1 is the maximum width of the cross section, and the thickness D1 is the maximum value of the thickness measured along the direction orthogonal to the direction of the width W1. The same applies to W2 and D2. At this time, 0.3 mm ≦ W1 ≦ 20 mm is preferable, and 0.8 mm ≦ W1 ≦ 20 mm is more preferable. Further, it is preferable that 0.1 mm ≦ D1 ≦ 0.5 mm. Further, it is preferable that 0.1 mm ≦ W2 ≦ 10 mm. Further, it is preferable that 0.05 mm ≦ D2 ≦ 0.5 mm.

As described above, in the present embodiment, both the straight pile 31 and the crimp pile 32 are made of polyethylene. Therefore, not only the straight pile 31 and the crimp pile 32 each have a relatively long life, but also the rate of deterioration of both is relatively similar. Further, when 1.0 ≦ S1 / S2 ≦ 1.5, the durability is further improved. As a result, the appearance of the artificial turf 1 is maintained for a long period of time. Further, since both the straight pile 31 and the crimp pile 32 are made of polyethylene, they can be melted together and remolded, which is suitable for recycling after the useful life has expired. In addition, it can be reused for a wide range of purposes during recycling.

<2. Manufacturing method>
Next, an example of a method for manufacturing the artificial turf 1 will be described. First, as a material for forming the straight pile 31 and the crimp pile 32 (hereinafter referred to as pile material), a polyethylene material mixed with a green colorant is prepared. This polyethylene material can be, for example, a linear low density polyethylene having a density of 0.926 g / cm ³ .

Next, the above pile material is put into an extruder, and melt extrusion molding is performed under predetermined temperature conditions. As a result, the thread-like resin material is extruded from the opening of the extruder. The temperature condition at this time can be a temperature higher than the melting point of the pile material, for example, 180 ° C. Subsequently, the thread-like pile material extruded from the extruder is cooled and solidified in a water tank, and the thread is uniaxially stretched. After that, the yarn is manufactured by performing relaxation heat treatment in a hot water tank. At this time, for example, the temperature of the water tank for cooling and solidifying can be set to 30 ° C. Further, as an aspect of uniaxial stretching, uniaxial stretching can be performed in a hot water tank at 90 ° C to 100 ° C by roll stretching. The temperature of the hot water tank in which the relaxation heat treatment is performed can be 90 ° C to 100 ° C. After the relaxation heat treatment, the yarn is wound into a yarn roll.

In this embodiment, different types of yarns are formed according to the above manufacturing methods. More specifically, two types of yarn are produced to form two types of pile 3 (straight pile 31 and crimp pile 32). Hereinafter, the yarn for the straight pile 31 is referred to as a straight yarn, and the yarn for the crimp pile 32 is referred to as a crimp yarn. In the present embodiment, the straight yarn and the crimp yarn are made of the same material, but have different cross-sectional shapes (area, width and thickness) and fineness per one. Further, the crimped yarn is subjected to a crimping process after the relaxation heat treatment and before being wound as a yarn roll to be processed into a crimped yarn. Since various methods such as heat treatment are known as methods for crimping yarn for piles of artificial turf, detailed description thereof will be omitted here.

Subsequently, after the production of the yarn rolls of straight yarn and crimped yarn, the yarns unwound from these yarn rolls are continuously planted on the base material 2 using a tufting machine. In the present embodiment, three straight yarn yarn rolls and eight crimped yarn yarn rolls are prepared, and a total of 11 yarns unwound from each are twisted into a bundle, and then the twisted yarns are twisted together. Is sewn to the base material 2 by a tufting machine. The number of each yarn roll of the straight yarn and the crimped yarn used in this tufting process is the total fineness S1 of the straight pile 31 and the crimped pile 32 contained in the artificial turf 1 finally manufactured. The total fineness S2 is appropriately determined so as to satisfy the above-mentioned numerical range. Further, in this tufting step, a bundle of loop-shaped yarns standing up from the base material 2 is formed, and the apex of the bundle is cut. As a result, from each planting point P1 on the base material 2, 6 turf leaves made of straight pile formed from straight yarn and 16 turf leaves made of crimp pile formed from crimp yarn. A total of 22 turf leaves will stand up. Further, the length L1 of the turf of the straight pile and the length L2 of the turf of the crimped pile are the same. Hereinafter, the member composed of the base material 2 and the piles 31 and 32 formed up to this point is referred to as an intermediate.

Subsequently, in order to fix the pile 3, a backing agent is applied to the back surface 2b of the base material 2 contained in the intermediate to form the backing layer 4. Then, the intermediate coated with the backing agent is dried in a high temperature environment to obtain the final artificial turf 1. The temperature condition T1 in this drying step is a temperature lower than the melting point T2 of the crimped pile 32 (the same as the melting point of the straight pile 31 in this embodiment), for example, T2 = 110 ° C. to 130 ° C. (atmospheric temperature). Is preferable. From the viewpoint of shortening the drying step, it is preferable that T2 ≧ 100 ° C. or higher.

<3. Modification example>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the following changes are possible. In addition, the gist of the following modifications can be combined as appropriate.

<3-1>
The planting point P1 where the straight pile 31 is planted and the planting point P1 where the crimped pile 32 is planted may be different. In this case, for example, the planting point P1 in which the straight pile 31 is planted and the planting point P1 in which the crimped pile 32 is planted are alternately arranged, so that the straight pile 31 is formed on the entire artificial turf 1. And the crimp pile 32 are preferably mixed as evenly and in a well-balanced manner as possible. Further, when the planting points P1 in which the straight pile 31 and the crimp pile 32 are planted are different, a step is formed between the straight pile 31 portion and the crimp pile 32 portion in some cases. Therefore, in this sense, it is preferable to configure the straight pile 31 and the crimp pile 32 to stand up from the same planting point P1 in order to maintain a more natural texture as in the above embodiment.

<3-2>
A filler may be filled between the piles 3 on the surface 2a of the base material 2. This filling serves as a cushioning material to prevent the player from being injured during play, and can also protect the turf leaves. In addition, the filler can adjust the momentum of the ball used in the competition, control the ease of running of the athlete, and can improve the playing performance of the competition on the artificial turf 1. .. As the filler, at least one of an elastic filler and a hard filler can be used. As the elastic filler, for example, a rubber chip made of a crushed product of a waste tire can be used. As the hard filler, for example, sand can be used.

Hereinafter, examples of the present invention will be described, but the present invention is not limited to the following examples.
(Example 1)
By the above manufacturing method, an artificial turf having the configuration according to the above embodiment and satisfying the following conditions (Example 1) was produced. That is, the straight yarn was a polyethylene monofilament yarn having a width W1 = 0.85 mm and D1 = 0.24 mm. The crimped yarn was a polyethylene monofilament yarn having a width W2 = 0.65 mm and a thickness D2 = 0.12 mm, and was crimped by heat treatment. Then, these two types of yarns are bundled to form a yarn bundle, and the horizontal planting interval (number of gauges) is 5/16 inches and the vertical planting interval (number of stitches) is 6 lines / inch. The yarn bundle was tufted on a polypropylene substrate. At this time, the total fineness S1 = 5550 dtex (1850 dtex / line x 3) and the total fineness S2 = 4000 dtex (500 dtex / line x 8) per thread bundle (per share), and L1 = L2. = 30 mm. Further, a mixed product of SBR latex and urethane resin was applied to the back surface of the base material to form a backing layer.

(Example 2)
The artificial turf according to Example 2 was produced in the same manner as in Example 1 except that the total fineness of the crimped yarn S2 (per share) = 5000 dtex (500 dtex / piece x 10 pieces).

(Comparative Example 1)
The artificial turf according to Comparative Example 1 was produced in the same manner as in Example 1 except that the total fineness S2 (per strain) of the crimped yarn was 6000 dtex (500 dtex / piece x 12 pieces).

(Comparative Example 2)
The artificial turf according to Comparative Example 2 was produced in the same manner as in Example 1 except that the total fineness of the crimped yarn S2 (per strain) = 3500 dtex (500 dtex / piece x 7 pieces).

(Comparative Example 3)
The artificial turf according to Comparative Example 3 had a total fineness S2 (per share) of crimp yarn S2 (700 dtex / piece x 8 pieces), a width W2 = 0.7 mm, and a thickness D2 = 0.13 mm. Was produced in the same manner as in Example 1.

(Comparative Example 4)
The artificial turf according to Comparative Example 4 had a total fineness S2 (per share) of crimped yarn S2 (700 dtex / piece x 5 pieces), a width W2 = 0.7 mm, and a thickness D2 = 0.13 mm. Was produced in the same manner as in Example 1.

(test)
The artificial turf according to Examples 1 and 2 and Comparative Examples 1 to 4 was prepared, and then the artificial turf was repeatedly compressed, and the appearance of the artificial turf after the repeated compression treatment (hereinafter referred to as “compressed artificial turf”). Was visually evaluated. The repeated compression treatment was carried out using the testing machine described in Japanese Patent Application Laid-Open No. 2013-148413. More specifically, a flat indenter of φ100 mm is installed on the artificial turf, compressed until a load of 70 kg is applied, and then released after reaching the cycle, which is repeated 1000 times at 20 seconds / time. Processing was carried out. In addition, the vertical repulsion height of the ball and the slipperiness of the sole of the shoe were evaluated with respect to the artificial turf after compression. The vertical repulsion height of the ball is the repulsion height when an artificial turf is placed on the asphalt installation surface and the soccer ball is vertically dropped from a height of 2 m, and is an average value of five times. The slipperiness of the sole was evaluated according to the method specified by the Japan Football Association.

The above test results are shown in the table below.

In Comparative Examples 2 and 4, after the repeated compression treatment, the straight yarn was bent in a V shape, and it was difficult to restore the appearance (evaluation “B”). Further, in Comparative Examples 1 and 3, after the repeated compression treatment, the low-rise portion of the crimped yarn was settled and the turf length was reduced (evaluation “B”). On the other hand, in Examples 1 and 2, the crimped yarn did not bend even after the repeated compression treatment, and the turf height was restored to about 80% one day later, and when brushing was performed, the appearance was in the initial state. It did not change (evaluation "A").

1 Artificial turf 2 Base material 2a Front side 2b Back side 3 Pile 31 Straight pile 32 Shrink pile 4 Backing layer

Claims (7)

An artificial turf comprising a substrate having a front surface and a back surface and a large number of piles imitating turf leaves standing on the surface of the substrate.
The numerous piles include straight piles and crimp piles.
The straight pile and the crimp pile are made of the same polyethylene having the same density and melting point .
When the total fineness of the straight pile is S1 and the total fineness of the crimp pile is S2,
1.0 ≦ S1 / S2 ≦ 1.5,
The fineness per filament constituting the straight pile is 1000 dtex or more.
The fineness per filament constituting the crimp pile is 400 dtex or more.
Artificial turf. The straight pile and the crimp pile are planted at the same planting site on the substrate.
The artificial turf according to claim 1 . 1.2 ≦ S1 / S2,
The artificial turf according to claim 1 or 2 . It ’s a method of manufacturing artificial turf.
Steps to make straight yarn made of polyethylene,
Steps to make crimp yarns made of polyethylene,
The surface of the substrate, which comprises a straight pile and a crimp pile that imitate turf leaves formed from the straight yarn and the crimp yarn, respectively, by planting the straight yarn and the crimp yarn on the substrate. In the step of manufacturing the intermediate of the artificial turf having a large number of piles standing on the top, when the total fineness of the straight pile is S1 and the total fineness of the crimped pile is S2, 1.0 ≦ The step of manufacturing the intermediate so that S1 / S2 ≦ 1.5, and
A backing agent is applied to the back surface of the base material contained in the intermediate to prevent the pile from falling off from the base material, and the backing agent is dried in a high temperature environment lower than the melting point of the crimp yarn. Steps to make and
Including
The polyethylene constituting the straight yarn and the crimped yarn is the same polyethylene having the same density and melting point.
The fineness per filament constituting the straight yarn is 1000 dtex or more.
The fineness per filament constituting the crimp yarn is 400 dtex or more.
How to make artificial turf. The crimp pile has a smaller cross-sectional area than the straight pile.
The manufacturing method according to claim 4 . The crimp pile has a shorter turf length than the straight pile.
The manufacturing method according to claim 4 or 5 . The step of drying the backing agent is a step of drying the backing agent in a high temperature environment of 100 ° C. or higher and 130 ° C. or lower.
The manufacturing method according to any one of claims 4 to 6 .

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