JP2005060973A - Artificial turf and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide artificial turf akin to natural turf in terms of a feeling of treading. <P>SOLUTION: This artificial turf 10 is equipped with a base fabric 12, a first pile 16 which is erected on the base fabric 12 and which is composed of a plurality of first filaments 14, and a second pile 20 which is erected on the base fabric 12 and which is composed of a plurality of second filaments 18 more tightly twisted than the first filaments 14. In the artificial turf, the first and second filaments 14 and 18 are twisted so that a person can feel softness like that of the natural turf when treading the artificial turf. Additionally, since the first and second filaments 14 and 18 are twisted, the filaments are prevented from being brought down in the same direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an artificial turf, and more particularly to an artificial turf in which a filament is planted on a surface of a base cloth made of a rough cloth and the like, which has an excellent feeling of stepping and has an appearance similar to natural turf.

  Artificial turf is easier to maintain than natural turf. For this reason, it is widely used for indoor and outdoor baseball fields, tennis courts, soccer fields, futsal courts, and the like. However, when artificial turf is stepped on with a shoe, multiple filaments (one by one material forming the turf leaf of the artificial turf) stepped on the shoe sole and applied with force from above fall in the same direction. Along with that, there is a problem that the shoes are also slid easily in the direction of lying down of the filament. Also, if the same part is stepped on many times, the filament may fall over and not return. Therefore, short filaments are generally used so that such a phenomenon is unlikely to occur, but such short filaments do not have a feeling of stepping on like natural turf.

  In addition, when a pile falls by stepping on the shoe sole, an artificial turf that attaches a pile of a combination of flat filaments and thread filaments to the base fabric to suppress slipping of the shoe sole after falling Is also considered (see, for example, Patent Document 1). However, the artificial turf described in Patent Document 1 does not prevent the fall of the filament itself, but forms irregularities on the surface after the fall of the filament to make it difficult to slip. Is not a solution.

  There is also an artificial turf in which a high-cut pile having a predetermined color and a low loop pile having a different length from the predetermined color and having a length shorter than that of the high-cut pile are alternately planted (see, for example, Patent Document 2). This is intended to change the surface color of the part to the color of the low loop pile when stepping on the artificial turf, but the uprightness of the high cut pile is also reinforced by the loop pile. . However, although the artificial grass described in Patent Document 2 maintains the uprightness of the high-cut pile to a certain extent by reinforcing the low-loop, the high-cut pile and the low-loop pile fall together in the same direction when exceeding a predetermined value. Still, slipping is not prevented, and the length of both piles is short, so it does not have a feeling of stepping on like natural turf.

For the conventional problems as described above, in order to prevent lodging and obtain a feeling of stepping closer to natural turf, a short auxiliary filament was planted between long turf filaments while using a relatively long filament. Artificial grass has been considered (see, for example, Patent Document 3).
Japanese Utility Model Publication No. 3-79310 Japanese Utility Model Publication No. 6-42988 JP-A-7-109661

  However, when manufacturing an artificial turf composed of a long turf filament and a short auxiliary filament as described in Patent Document 3, there are the following problems.

  In general, artificial turf supplements a plurality of needles that move up and down, which are arranged perpendicular to the traveling direction of the base fabric, and a thread that is driven to swing in synchronization with the sewing needles and extends from the needles inserted into the base fabric. And a tufting machine including a cutter unit that cuts a yarn assembled to the looper. The length of the filament to be cut is determined by the descending amount of the sewing needle, the position of the looper and the cutter part. Therefore, it is necessary to change the descending amount of the sewing needle and the positions of the looper and the cutter unit for each filament in accordance with the lengths of the lawn filament and the auxiliary filament. For this reason, existing tufting machines cannot be used as they are, and new equipment is required.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an artificial turf that prevents the artificial turf from falling in the same direction and has a feeling of depression similar to natural turf even with an existing tufting machine. Is to be able to do it.

  The artificial turf of the present invention is twisted more than the first filament that is erected on the base fabric, the first pile that is erected on the base fabric, and that is composed of a plurality of first filaments. A second pile of a plurality of strong second filaments, wherein the lengths of the first filament and the second filament in the extended state are substantially the same.

  According to such artificial grass, filaments with different twisting strength are used, so the filaments are oriented in various directions. When the filaments are stepped on with the shoes, all the filaments under the shoes are in the same direction. You will never fall asleep. There is also a variation close to natural grass. Furthermore, since the lengths in the stretched state of two types of filaments with different twists are substantially the same, when the filament is sewn into the base fabric by a tufting machine, the amount of lowering of the sewing needle, the position of the looper and the cutter part are determined by the filament It is not necessary to change depending on the type.

  The first filament is preferably formed as follows. A step of forming a first twisted yarn by twisting a plurality of first monofilament bodies to form a first twisted yarn by further twisting a plurality of the first twisted yarns; Forming a first original fabric by knitting with a predetermined number of braids per unit length, heating the first original fabric, and knitting the heated first original fabric The filament is formed through the above. In addition, the second filament is preferably formed as follows. That is, a plurality of second monofilament bodies are twisted together to form a second twisted yarn, and a plurality of second twisted yarns are further twisted to form a second twisted yarn, A process of forming a second original fabric, a step of heating the second original fabric, and a heated second original material; A filament that is formed or formed through a process of unraveling the warp.

  The monofilament body refers to a filament that is a bundle of one or a plurality of monofilaments that are cooled in a molten state from a yarn forming die.

  By manufacturing in this way, the first filament and the second filament can be twisted, and further, the crystallinity of the first filament and the second filament can be increased by heating, and the dimensions can be increased. Stability can be given. Further, in the step of forming the second raw fabric, the number of braids per unit length of the second filament is made larger than the number of braids per unit length of the first filament, whereby the second filament Can be made stronger than the first filament.

  The first filament is formed by performing a step of reheating the first original fabric after the step of heating the first original fabric and before the step of knitting the first original fabric. May be.

  As described above, predetermined dimensional stability can be given to the first and second original fabrics by heating. By reheating only the first original fabric, the crystallinity of the first filament can be adjusted in a smaller direction, and the dimensional stability can be made weaker than that of the second filament. As a result, the twist of the first filament can be made weaker than that of the second filament.

  It is preferred that the weight per unit length of the first pile and the second pile is substantially the same. According to this, the amount of filaments passed through one sewing needle of the tufting machine can be made the same, and uniform sewing can be performed.

  The first pile and the second pile may be arranged in parallel in the same direction, and the first pile row and the second pile row may be spaced apart from each other. Such an artificial turf can be manufactured by passing either the first filament or the second filament corresponding to the row through each of the plurality of sewing needles when manufactured by a tufting machine.

  The first pile row and the second pile row may be alternately arranged.

  The first filament and the second filament are preferably made of a synthetic resin. As the synthetic resin, a vinylidene chloride copolymer, a vinylidene fluoride copolymer, polypropylene, a propylene copolymer, polyamide, or polyester can be suitably used.

  It is preferable to provide a backing material film or layer on the base fabric surface opposite to the side where the first pile or the second pile is erected. The first pile or the second pile can be fixed to the base fabric by the backing material.

  It is also preferable to provide an underpad on the base fabric via a backing material. The underpad can absorb the impact on the foot when you step on the artificial turf. The backing material is an adhesive resin, an adhesive resin dissolved in a solvent, or latex. The backing material film or layer is manufactured by coating, extrusion laminating or thermocompression laminating. As the adhesive resin, acrylic resin, methacrylic resin, acrylate resin, methacrylate resin, urethane resin, and epoxy resin can be suitably used. In addition, the suitable form of an underpad is an underpad which foamed resin, an underpad which provides many protrusions and dents, or an underpad which combined these.

  In the method for producing artificial turf of the present invention, the first filament is preferably formed as follows. A plurality of first monofilament bodies are twisted together to form a first twisted yarn, and a plurality of the first twisted yarns are further twisted to form a first twisted yarn; and a first twisted yarn Forming a first original fabric by knitting with a predetermined number of braids per unit length, heating the first original fabric, and knitting the heated first original fabric And a first process for forming a first filament comprising: The second filament is preferably formed as follows. That is, a plurality of second monofilament bodies are twisted together to form a second twisted yarn, and a plurality of second twisted yarns are further twisted to form a second twisted yarn, A process of forming a second original fabric, a step of heating the second original fabric, and a heated second original material; A second process of forming a second filament including a step of knitting the anti-knitting, and a plurality of first filaments and a plurality of second filaments are sewn to the base fabric by a tufting machine. And a third process for standingly forming the first pile and the second pile.

  According to such a manufacturing method, the first filament and the second filament can be twisted, and further, the crystallinity of the first filament and the second filament can be increased by heating, and the predetermined filament can be obtained. Dimensional stability can be provided. Further, in the step of forming the second raw fabric, the number of braids per unit length of the second filament is made larger than the number of braids per unit length of the first filament, whereby the second filament Can be made stronger than the first filament.

  Further, the first process further includes a step of reheating the first original fabric after the step of heating the first original fabric and before the step of knitting the first original fabric. be able to.

  As described above, predetermined dimensional stability can be obtained for the first and second original fabrics by heating, but the recrystallization of only the first original fabric reduces the crystallinity of the first filament. The direction stability can be adjusted to make the dimensional stability weaker than the second filament. As a result, the twist of the first filament can be made weaker than that of the second filament.

  The weight per unit length of the first pile and the second pile is preferably substantially the same. According to this, the amount of filaments passed through one sewing needle of the tufting machine can be made the same, and uniform sewing can be performed.

  The knitting in the step of forming the first original fabric and the step of forming the second original fabric can be performed by circular knitting. Since the circular knitting does not have a folded portion, the first cocoon yarn and the second cocoon yarn can be knitted uniformly, and a uniform twist can be formed by heating.

  The first pile and the second pile can be arranged in parallel in the same direction, and the first pile row and the second pile row can be arranged apart from each other. By doing in this way, when manufacturing with a tufting machine, it can manufacture by passing either the 1st filament or the 2nd filament corresponding to a row to each of a plurality of sewing needles.

  Further, the first pile row and the second pile row can be alternately arranged in parallel.

  The first filament and the second filament are preferably formed of the synthetic resin.

  As described above, since the artificial turf of the present invention does not fall down in one direction when stepped on, the shoe sole can be prevented from slipping and has a feeling of stepping on close to natural turf. In addition, since the lengths of the first filament and the second filament in the stretched state are substantially the same, the needle lowering amount is the same for all the sewing needles. Therefore, the existing tufting machine is also used. And increase in equipment cost can be prevented.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic partial cross-sectional view of an artificial turf 10 according to an embodiment of the present invention. The artificial turf 10 has a twist stronger than that of the first filament 14 and the plurality of first piles 16 composed of the base fabric 12 that is the ground tissue, the first filaments 14 alternately arranged on the base fabric 12, and the first filament 14. A second pile 20 made of the second filament 18, a backing material 22 for fixing the first filament 14 and the second filament 18 attached to the back surface of the base fabric 12, and further below A shock-absorbing underpad 24 attached thereto.

  The first filament 14 and the second filament 18 are made of synthetic resin, but are not limited thereto. The first filament 14 and the second filament 18 are sewn into the base cloth 12 by a tufting machine, as will be described later. The first filament 14 and the second filament 18 have substantially the same length in a state where a predetermined tension is applied and the twist is extended, but in a normal state, as shown in FIG. Since the filament 18 is strongly twisted, the height of the second filament 18 is lower than that of the first filament 14.

  Next, the manufacturing process of the artificial turf 10 of this embodiment will be described.

  FIG. 2 is a process diagram showing a process of forming the first filament 14 and the second filament 18. First, the raw material compound is put into an extruder and melted (S1).

  The compound is spun and formed through one or more discharge holes of the molding machine to form two types of first monofilament body and second monofilament body of desired thickness that are integrated during winding molding (S2). .

  A plurality of first monofilament bodies and a plurality of second monofilament bodies are combined and twisted in the left direction (Z twist) to form a first twisted yarn and a second twisted yarn, and a plurality of first twisted yarns and second twisted yarns, respectively. Are twisted together to form a first mash yarn and a second mash yarn (S3). At this time, the numbers of the first twisted yarn and the second twisted yarn are adjusted so that the weights per unit length of the first and second twisted yarns are substantially equal.

  The first mash yarn and the second mash yarn are twisted in the S direction so that the residual torque becomes small in an unloaded state (S4).

  The first twisted yarn and the second twisted yarn are spun while applying a predetermined tension to the cone, thereby forming the first spindle yarn and the second spindle yarn (S5).

  A circular knitting machine performs circular knitting in which the first spindle yarn and the second spindle yarn are continuously knitted in a certain direction to form a first original fabric and a second original fabric (S6). In this case, the first spindle yarn is knitted at a predetermined number of knittings per unit length, and the second spindle yarn is knitted more than the number of knittings per unit length of the first spindle yarn. Knit with. In the circular knitting, since there is no folded portion, the first spindle yarn and the second spindle yarn can be knitted by a certain knitting method, and each of the first filament 14 and the second filament 18 is knitted. A uniform twist can be formed. However, the knitting method is not limited to circular knitting, and may be other knitting methods such as weft knitting.

  The first original fabric and the second original fabric are put in a heat-setting kettle, and wet heat steam is introduced to perform first heating (S7). By this first heating, the plasticizer is removed from the resin that is the material of the first original fabric and the second original fabric, the crystallinity of the resin is increased, and the dimensional stability is increased.

  Only the first original fabric is reheated (second heating) (S8). By this reheating, a part of the crystal of the resin material can be melted again, and the degree of crystallinity can be adjusted in a small direction, thereby reducing the dimensional stability.

  The first original fabric that has undergone the first heating and the second heating, and the second original fabric that has undergone the first heating are knitted to form the first filament 14 and the second filament 18 (S9). ). The first filament 14 and the second filament 18 are different in the number of knitting when the first spindle yarn and the second spindle yarn are knitted into the first original fabric and the second original fabric, and the first original yarn. By adjusting the opposite degree of crystallinity, the twist of the first filament 14 is weaker than the twist of the second filament 18. As a result, two types of filaments (first filament 14 and second filament 18) having different twisting degrees can be formed. These first filament 14 and second filament 18 are wound around a cone. As described above, when forming the first cocoon yarn and the second cocoon yarn, the weights per unit length thereof are made substantially equal, so the first filament 14 and the second filament The weight per unit length of 18 is also substantially equal.

  Next, a tufting process in which the first filament 14 and the second filament 18 are sewn into the base fabric 12 will be described. The tufting machine used in the present embodiment is general, and FIG. 3 is a diagram showing a state in which the artificial turf of the present embodiment is manufactured using such a tufting machine. A general tufting machine is driven to swing in synchronization with a plurality of vertically driven sewing needles 26 and a vertically moving sewing needle 26 which are arranged in parallel in a horizontal direction perpendicular to the feed direction of the base fabric 12. A plurality of loopers 28 for capturing filaments extending from the respective sewing needles 26 and a plurality of cutter portions 30 assembled to each of the loopers 28 for cutting the yarn captured by the loopers 28 are provided.

  When the artificial turf 10 of this embodiment is formed by such a tufting machine, first, the first filament 14 and the second filament 18 are alternately passed through the sewing needles 26 of the base fabric 12. In this case, since the weight per unit weight of the 1st filament 14 and the 2nd filament 18 is substantially equal, the needle hole of the sewing needle 26 may be the same diameter.

  Then, sewing is started on the base fabric 12. Sewing is performed as follows. First, the sewing needle 26 is simultaneously pierced from above with respect to the base fabric 12 by an upper drive mechanism (not shown). The looper 28 is introduced between the needle hole 32 of the sewing needle 26 and the first filament 14 or the second filament 18 in a state where the needle hole 28 of the sewing needle 26 is located on the lower side of the base cloth 12. The filament 14 or the second filament 18 is captured by the looper 28 and a loop 34 is formed. The loop 34 is pulled by the sewing needle 26 being driven upward. In this state, the cutter portion 30 and the looper 28 cooperate to cut the lower end of the loop 34. Thus, the cut first pile 16 and second pile 20 are formed.

  As described above, the first filament 14 and the second filament 18 have twists having different strengths in the final step of the filament manufacturing process in Step 10. However, a tension T is applied to the first filament 14 and the second filament 18 in order to prevent the first filament 14 and the second filament 18 from being entangled and for uniform sewing. For this reason, when the first filament 14 and the second filament 18 are passed through the sewing needle 26 and sewn, the twist is in an extended state. The first filament 14 and the second filament 18 are sewn into the base fabric 12 in the same manner, captured by the looper 28 at the same position below the base fabric 12, cut by the cutter unit 30, and the tension T Released from. When released from the tension T, the first filament 14 and the second filament 18 are in respective states having different twists as shown in FIG.

  Thereafter, a backing 22 is applied to the back surface of the base fabric 12 to prevent the first pile 16 and the second pile 20 from falling off, and an underpad 24 for absorbing the impact is attached.

  According to the present embodiment, two kinds of first filaments 14 and second filaments 18 having different strength twists are used as the sewing needle 26 having the same size needle hole, and the vertical movement width of the sewing needles 26 is determined. And the position of the looper 28 and the cutter part 30 can be formed with the same position. That is, the artificial turf 10 of the present embodiment can be manufactured using a conventional tufting machine without any particular modification.

  When the artificial grass 10 according to this embodiment is stepped on, the first filament 14 first touches the shoe sole (or the sole of the foot). At this time, since the first filament 14 is slightly twisted, there is no feeling that the tip of the first filament 14 sticks into the shoe sole when stepped on, and the softness like natural grass is felt. When further stepped on, the region 36 including only the first filament 14 shown in FIG. 1 reaches the region 38 where the first filament 14 and the second filament 18 are mixed. However, since the first filament 14 and the second filament 18 are twisted and the positions of the tips are not uniform, there is no feeling of moving from the region 36 to the region 38, and it naturally moves to the region 38. In addition, since the first filament 14 and the second filament 18 are twisted, they are oriented in various directions, and even if the first filament 14 and the second filament 18 are stepped on, the first filament 14 and B do not fall down in the same direction. Furthermore, the whole turf is elastic by twisting, and a restoring force like natural turf is felt. Moreover, when the twist of the 1st filament 14 and the 2nd filament 18 differs, the dispersion | variation like natural grass is felt. Accordingly, it is possible to obtain a feeling of depression almost like natural grass as a whole.

  As a synthetic resin, a first filament 14 composed of 8 monofilament bodies of 830 decitex and a second filament 18 composed of 12 monofilament bodies of 610 decitex specified by JIS standard L0101 using vinylidene chloride resin is used. Artificial grass was formed by the above method.

  When the artificial turf 10 of this example was stepped on with shoes, first, the sole contacted the pile 14 first. At this time, the pile 14 had an appropriate hardness of 830 dtex, but was twisted, so that no discomfort such as a piercing tip was felt. As we stepped further, we reached a pile of 610 dtex, but since the first pile 16 and the second pile 20 were twisted, the first pile 16 to the first pile 16 and the second pile There was no feeling as if the part where the pile 20 was mixed was reached. Moreover, since the 1st pile 16 and the 2nd pile 20 were each twisted, the elasticity close | similar to natural grass was felt. Since the first pile 16 was supported by the second pile 20, the first pile 16 and the second pile 20 did not fall down by stepping on. The vinylidene chloride resin pile felt more like natural turf than the polyamide pile.

  Furthermore, the artificial turf of this example also had excellent shock absorption performance. The result of comparing the ratio of rebound when the ball is dropped on the artificial turf of this embodiment with that of the conventional artificial turf is shown below.

従来の人工芝としては、フィラメントの長さが１３ｍｍで、フィラメントの種類が１種類のものを用いた。また、使用球は硬式野球ボール（ＭＩＺＵＮＯ ＯＦＩＣＩＡＬ ＶＩＣＴＯＲＹ）であった。所定の高さ（１００，１５０，２００，２５０，３００ｃｍ）から初速度を与えずに、従来人工芝と本実施形態の人工芝の上にボールを自然落下させ、ボールが跳ね返った高さを測定した結果を示したものである。ボールが跳ね返った高さから、落とした高さに対する跳ね返った高さの割合を求めた
この表によると、従来の人工芝と比較して、どの高さから落とした場合も跳ね返りの割合が低いことがわかった。以上より、本実施形態の人工芝は、従来の人工芝よりも衝撃吸収性に優れていることもわかった。

As the conventional artificial turf, a filament having a length of 13 mm and one kind of filament was used. The ball used was a hard baseball (MIZUNO OFICIAL PICTURE). Without giving an initial velocity from a predetermined height (100, 150, 200, 250, 300 cm), the ball is naturally dropped onto the conventional artificial turf and the artificial turf of this embodiment, and the height at which the ball bounces is measured. The results are shown. The ratio of the bounce height to the dropped height was calculated from the height of the ball bounce. According to this table, the percentage of bounce is low when dropped from any height compared to conventional artificial grass. I understood. From the above, it was also found that the artificial turf of this embodiment is superior in impact absorption than the conventional artificial turf.

  As mentioned above, although preferred embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to the said embodiment.

It is a general | schematic fragmentary sectional view of the artificial turf concerning this embodiment. It is process drawing which showed the process of forming the filament which forms the artificial turf of this embodiment. It is the figure which showed the state which manufactures the artificial grass of this embodiment using a tufting machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Artificial grass 12 ... Base cloth 14 ... 1st filament 16 ... 1st pile 18 ... 2nd filament 20 ... 2nd pile 26 ... Sewing needle 28 ... Looper 30 ... Cutter part

Claims (16)

With the base fabric,
A first pile of a plurality of first filaments erected on the base fabric;
A second pile of a plurality of second filaments that are erected on the base fabric and are stronger than the first filaments;
Artificial turf in which the length in the extension state of the 1st filament and the 2nd filament is substantially the same. The first filament is
A step of twisting a plurality of first monofilament bodies to form a first twisted yarn, and further twisting a plurality of the first twisted yarns to form a first twisted yarn; and
Knitting the first stranded yarn at a predetermined number of knittings per unit length to form a first original fabric;
Heating the first original fabric;
A step of unraveling the heated first original fabric, and
The second filament is
A step of twisting a plurality of second monofilament bodies to form a second twisted yarn, and further twisting a plurality of the second twisted yarns to form a second twisted yarn;
Knitting the second braided yarn per unit length at a knitting number greater than the predetermined knitting number to form a second raw fabric;
Heating the second original fabric;
The artificial turf according to claim 1, wherein the artificial turf is formed through a step of knitting the heated second original fabric.   The step of reheating the first original fabric after the step of heating the first original fabric and before the step of knitting the first original fabric by the first filament. The artificial turf according to claim 2, which is formed by performing.   The artificial turf according to any one of claims 1 to 3, wherein weights per unit length of the first pile and the second pile are substantially the same.   The first pile and the second pile are arranged in parallel in a row in the same direction, and the first pile row and the second pile row are spaced apart from each other. The artificial turf according to any one of claims 1 to 4.   The artificial turf according to claim 5, wherein the first pile row and the second pile row are alternately arranged.   The artificial turf according to any one of claims 1 to 6, wherein the first filament and the second filament are synthetic resins.   The artificial turf according to any one of claims 1 to 7, wherein a backing material is provided on a base fabric surface opposite to a side where the first pile or the second pile is erected.   The artificial turf according to any one of claims 1 to 8, wherein an underpad is provided on a base fabric through the backing material. A step of twisting a plurality of first monofilament bodies to form a first twisted yarn, and further twisting a plurality of the first twisted yarns to form a first twisted yarn; and
Knitting the first stranded yarn at a predetermined number of knittings per unit length to form a first original fabric;
Heating the first original fabric;
A first process of forming a first filament comprising: heating the first fabric that has been heated; and
A step of twisting a plurality of second monofilament bodies to form a second twisted yarn, and further twisting a plurality of the second twisted yarns to form a second twisted yarn; and
Knitting the second braided yarn with a knitting number greater than the predetermined knitting number per unit length to form a second raw fabric;
Heating the second original fabric;
A second process of forming a second filament comprising: heating the second fabric that has been heated; and
A third process in which a plurality of the first filaments and a plurality of the second filaments are sewn to a base fabric by a tufting machine, and the first pile and the second pile are formed upright; A method for producing artificial turf.   The first process is a step of reheating the first original fabric after the step of heating the first original fabric and before the step of knitting the first original fabric. Furthermore, the manufacturing method of the artificial turf of Claim 10 further included.   The method for producing artificial turf according to claim 10 or 11, wherein the weight per unit length of the first pile and the second pile is substantially the same.   The method for manufacturing an artificial turf according to any one of claims 10 to 12, wherein the knitting in the step of forming the first original fabric and the step of forming the second original fabric is circular knitting.   The first pile and the second pile are arranged in parallel in the same direction, and the first pile row and the second pile row are arranged apart from each other. The method for producing artificial turf according to any one of 10 to 13.   The method of manufacturing artificial turf according to claim 14, wherein the first pile rows and the second pile rows are alternately arranged. The method for producing artificial turf according to any one of claims 10 to 15, wherein the first filament and the second filament are formed of a synthetic resin.

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