JP7337398B2 - Artificial lawn base cloth and artificial lawn - Google Patents

Description

The present invention mainly relates to an artificial lawn formed by spreading a large number of synthetic resin pile yarns on a base fabric, and to a base fabric constituting the artificial lawn.

In addition to gardens, balconies, parks, shops, etc., artificial lawns are widely used in sports fields such as baseball and soccer.

Artificial turf used for applications with relatively high momentum is generally made by tufting pile yarns into a woven base fabric, and then fixing the pile yarns to the back side of the base fabric with an adhesive such as latex. Created by Nylon, vinylidene chloride, polypropylene, polyethylene, etc. are used as the pile thread material, and the shape of the pile thread is often monofilament, tape, or split tape. The base fabric is often plain woven from flat yarns of a thermoplastic resin such as polypropylene.

However, a base fabric made of polypropylene flat yarn and an adhesive such as latex cannot provide a sufficient fixing force, and the planted pile yarn may move or fall off.
For this reason, a base fabric is created by stacking a nonwoven fabric layer under the base fabric (back side), and the pile yarn and nonwoven fabric arranged on the back side by tufting are combined and fixed by bonding to create a pile yarn and nonwoven fabric. There is a proposal to increase the adhesiveness to the base fabric and to use it for intense exercise. (Patent document 1)

As an extension of this, a base fabric is created by layering a non-woven fabric (web), which is made by stacking thin layers of polyester-centered short fibers on a polypropylene base fabric and spreading it into a sheet. ) is mechanically pushed (needle punching) to form a base fabric in which a part of the nonwoven fabric is protruded under (back side) of the base fabric (referred to as "FLW base fabric"). . Pile yarns arranged on the back side of the base fabric by tufting, many staples (short fibers) which are part of the nonwoven fabric protruding on the back side of the base fabric by needle punching, and flat yarns (fabric part) are integrally bonded with latex. Therefore, it has the effect of strongly fixing the pile yarn. For this reason, it is now very commonly used.

While the FLW base fabric technology strengthens the fixing force of the pile yarn, needle punching with hooked needles breaks a large number of wefts and warps that make up the base fabric, resulting in a significant decrease in the strength of the base fabric. There was a problem. In addition, due to the difficulty of designing the number of needles per unit area of the base fabric and the depth of piercing to ensure that the staples are stacked and evenly distributed and the amount of staples protruding to the back side, etc., the web amount is reduced. There was a problem that the thickness tends to be excessive and it is difficult to meet the demand for weight reduction.

As another technique, in order to prevent the strength reduction of the base fabric due to needle punching, a proposal has been made for a durable artificial turf base fabric in which the filaments for the base fabric are woven from aggregate yarns in which a large number of small-diameter filaments are joined together. There is (Patent Document 2) When the tufting needle is inserted, the small-diameter filamentary body splits so that the pile thread can be easily passed therethrough, thereby preventing the filamentary body from breaking and strength reduction. On the other hand, it is necessary to thermally bond the small linear bodies in order to form the bundle yarn, so that the small linear bodies are coated with a resin having a low melting point. Therefore, there is a problem that the production of the base fabric material is complicated.

Japanese Utility Model Laid-Open Showa 54-32357 Japanese Patent Application Laid-Open No. 2005-15972

The present invention is proposed to address the above problems. That is, based on a relatively simple material and structure, it is a high-strength, lightweight artificial fiber that can be used for a long period of time while preventing the pile yarn from slipping out and sagging and firmly holding the pile yarn. An object of the present invention is to provide a base fabric for lawns and an artificial lawn using such a base fabric.

In order to solve the above problems, according to the present invention, there is provided a base fabric woven with flat yarns drawn from a thermoplastic resin as warps and wefts, wherein the wefts are wider and thinner than the warps, and the flat Provided is a base fabric woven from warp and weft, which is a composite yarn, for artificial lawn , which is a composite yarn in which yarn and staple are combined (hereinafter referred to as "composite yarn weft woven base fabric"). be done.

In general, yarn is defined as ``a fiber that has been stretched thin and long and twisted'' and is divided into spun yarn and filament yarn, but it is used as warp and weft that constitute the sheet of the present invention. The yarn is a "flat yarn" obtained by stretching a thermoplastic resin film after slitting, and has a rectangular tape shape when viewed in cross section. Materials for the warp and weft are not particularly limited, but polypropylene is preferable from the viewpoint of strength.

The width of the weft thread is wider than that of the warp thread, and its thickness is thinner than that of the warp thread. This is to clarify the role that the weft yarns mainly play the function of integrating the pile yarns and the composite yarn weft woven base fabric when the pile yarns are implanted in the woven base fabric according to the present invention. With such a configuration, the tufted pile yarn mainly penetrates the weft yarn, and can easily penetrate the weft yarn. As the pile yarns can be easily penetrated, there is little decrease in strength, and since the warp yarns have the function of holding the pile yarns (holding force), the strength of the composite yarn weft woven base fabric as a whole and the holding force of the pile yarns are ensured. It will happen. Specific widths and thicknesses of the warp and weft, and the ratio of each dimension of the warp and weft are appropriately selected and are not particularly limited.

The weft yarn in the present invention is not a flat yarn itself obtained by drawing a thermoplastic resin, but a composite yarn in which a flat yarn and a staple are combined. The term "staple" as used in the present invention refers to an aggregate of short fibers, and includes both spun fibers and non-spun fiber-like fibers. The material is selected from cotton, blended yarn, polyester, acrylic, etc. Since it is an aggregate of short fibers, the ends of each fiber that make up the aggregate extend circumferentially. In the present invention, a single short fiber that constitutes an aggregate is called a "single fiber", and a portion that extends around it is called a "fluff".

As for the weaving method, plain weave and twill weave are generally used and preferred, but they are not particularly limited, and other weaving methods such as satin weave can also be used.

The "binding" between the flat yarn and the staple includes a method in which the flat yarn and the staple are uniformly twisted as a whole, a method in which the aligned staple is tied to the flat yarn with a thin thread, and a staple itself. includes a mode in which is wrapped around the flat yarn.

Further, there is provided a composite yarn weft woven base fabric for artificial lawn, wherein the staple is a sliver, and the composite yarn is a composite yarn obtained by twisting the flat yarn and the sliver.

"Sliver" in the present invention means short fibers of a material selected from cotton, blended yarn, polyester, acrylic, etc., which are loosened, separated, stretched straight, aligned in parallel, and made into a thick string and arranged in a straight line. It refers to the one that has been made uniform, and the one that has been reduced in thickness after repeating doubling and drafting after the gill process, improving the parallelism of the fibers, and achieving a symmetrical state. This is a concept included in the above-mentioned "staple".
Basically, the sliver is not twisted, and the fluff of the monofilaments constituting the sliver is irregularly stretched around the sliver. A loosely twisted sliver after the roving process is also included in the sliver if the fluff is irregularly extended around the sliver. A sliver is an intermediate step in spinning and does not include the twisted "yarn" after the spinning process.

“Twisting” the flat yarn and the sliver means pulling them together and uniformly twisting them at the same time, and is also called “twisting”. The pliing and twisting process is preferably carried out by a conventional spinning method using a ring spinning machine or the like, but is not particularly limited.

Further, the composite yarn has the flat yarn as a core material, the staple as a sheath material, and a cover yarn wound around the core material and the sheath material to combine the core material and the sheath material. A backing is provided.

In this method, the flat yarn and the sliver are not twisted, but are arranged parallel to each other and wrapped with a thin cover yarn. Although it is preferable to use a covering spinning machine, it is not particularly limited.

Further, there is provided a composite yarn weft woven base fabric for artificial lawn, characterized in that the fineness of the single fibers constituting the staple is 6.6 dt or more. Note that "dt" is an abbreviation for decitex, which is a unit representing the thickness of fibers or threads.

Further, there is provided an artificial lawn characterized in that after tufting pile yarns to the composite yarn weft woven base fabric, the pile yarns and the composite yarn weft woven base fabric are bonded to the back surface of the woven base fabric . be.

When the pile yarn and the composite yarn weft woven base fabric are bonded together, the staple containing fluff and the flat yarn bonded to the staple are also integrally bonded with the pile yarn. Adhesion is accomplished by conventional methods such as latex.

Further, a flat yarn obtained by drawing a thermoplastic resin is used as a warp, and a flat yarn that is wider and thinner than the warp obtained by drawing the thermoplastic resin is combined with a sliver to form a weft that is a composite yarn, and the warp and the weft are combined. Provided is a method for producing a composite yarn weft woven base fabric for an artificial lawn, which is produced by weaving.

The FLW base fabric, which is the conventional main base fabric for artificial lawn, has a problem that the needle punching for integrating the pile yarn and the base fabric breaks the threads that make up the base fabric and greatly reduces the strength of the base fabric. was there. In the present invention, the base fabric and the pile yarn are integrated without using a method such as needle punching that destroys the base fabric. Since the base fabric is not destroyed, the strength of the base fabric can be maintained high and can be used for a long period of time. Since there is no need to calculate the strength reduction of the base fabric, there is no need to allow for an excessive safety margin.

By binding the staple to the weft, the flat yarn, the staple having fluff, and the pile yarn can be integrally bonded, and the pile yarn is firmly held on the composite yarn weft woven base fabric . Therefore, it is possible to prevent the pile yarn from coming off or becoming sag.

In the present invention, since the warp yarns are narrower and thicker than the weft yarns, it is highly likely that the pile will pass between the warp yarns without sticking into the warp yarns, and the possibility that the pile will affect the strength retention of the warp yarns is low. . In addition, being thick, the warp yarns can play a role in retaining the strength of the base fabric. On the other hand, since the weft yarn is wide and thin, the pile is highly likely to penetrate the weft yarn, and because of its thinness, it can penetrate with little resistance. Therefore, the integrity between the pile and the weft is enhanced. Due to the synergistic effect of the integration in the bonding and the integration of the pile yarns in the weft penetration, the binding between the wefts and the pile yarns is strengthened, and the pile yarns are firmly held by the composite yarn weft woven base fabric .

In the FLW base fabric, it is necessary to overlap non-woven fabrics, and it is necessary to add an extra layer in anticipation of the mass reduction due to needle punching, which protrudes to the back side of the base fabric. On the other hand, since the nonwoven fabric itself is unnecessary in the present invention, it is possible to greatly reduce the weight of the artificial lawn while considering the balance with strength.

When the flat yarn and the staple are arranged and twisted by a ring spinning machine or the like, the twist is uniformly generated as a whole like a torsion bar. In this case, since the weft yarn has an extremely thin rectangular shape when viewed in cross section, the twisting may cause the cross-sectional shape itself to be curved or to be rounded into an elliptical shape. In this case, a substantial portion of the staple is taken into the inside of the curved flat yarn, so that the fluff of the staple does not appear on the outside when creating an artificial lawn, and the staple and the pile yarn are integrally bonded. As a result, the pile yarn holding force of the composite yarn weft woven base fabric is reduced.

In order to deal with such problems, the flat yarn is limited to sliver. In the case of sliver, since the state of being twisted into a thread is removed, a large number of fluffs stand in a wide range. Therefore, even if a considerable portion of the sliver is taken into the curved flat yarn, the pile yarn and the large number of fluff protruding from the flat yarn can be integrally bonded, and the pile of the composite yarn weft woven base fabric can be processed. A decrease in thread holding force can be prevented.

The flat yarn and the staple can be integrated by using the flat yarn as the core material, arranging the staple as the sheath material, and winding the flat yarn and the staple around the covering yarn. The staple and the pile yarn can be integrally bonded, and the pile yarn is firmly held on the composite yarn weft woven base fabric .

Plying flat yarns and staples may cause the flat yarns to bend as described above. When the cover yarn is wound, the flat yarn is not twisted, so the flat yarn does not bend much. Therefore, the staple is not entangled in the flat yarn, and even if the yarn is in a twisted state, the fluff can be used for adhesion processing.
In addition, since it is possible to maintain a thin and flat shape without bending, the pile yarn can easily pass through the flat yarn (weft) at the time of planting, and the weft and pile yarn can be easily connected. Strengthening can be secured. In addition, since the flat yarn does not deform, the possibility of misalignment is low.

When the staple and pile yarn are integrally bonded, it is important that the fluff of the staple penetrates the adhesive as deeply as possible in order to increase the bonding strength. When the fluff sticks into the adhesive and is three-dimensionally adhered, a so-called wedge effect occurs, increasing the adhesive strength. On the other hand, when the fluff is adhered in a lying state, the contact portion between the fluff and the adhesive becomes planar, and is easily separated by an external force. In order for the fluff to stick into the adhesive, it is necessary to prevent the fluff from becoming too thin. By setting the fineness of the short fibers constituting the staple to 6.6 dt or more, the fluff sticks into the adhesive and exhibits a wedge effect. When the staple is a sliver, the wedge effect can be more effectively exhibited because a large number of fluffs stand in a wider range.

The artificial lawn in which the pile yarn is planted in the composite yarn weft woven base fabric has a high strength of the base fabric and can be used for a long period of time. In addition, since the pile yarn is firmly held by the composite yarn weft woven base fabric , it is possible to prevent the pile yarn from slipping off or settling.

With the production method according to the present invention, there is no shortage of web amount due to reduction in strength due to needle punching or reduction in web (laminated nonwoven fabric), and wasteful stacking that excessively incorporates the shortage. Composite yarn weft woven substrates can be produced. Furthermore, the manufacturing method according to the present invention can provide a lightweight composite yarn weft woven base fabric in which the pile yarns are firmly held by the composite yarn weft woven base fabric without a decrease in strength.

1 is a schematic diagram of a composite yarn weft woven base fabric according to the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of an artificial lawn using a woven base fabric made from composite yarn wefts according to the present invention; (warp omitted) FIG. 2 is a schematic diagram of manufacturing a composite yarn weft woven base fabric by a pliing and twisting method. FIG. 2 is a schematic diagram of weft yarns created by a pliing and twisting method; It is a photograph of the weft created by the ply-twisting method. 2 is a photograph of a composite yarn weft woven base fabric (back side) manufactured using weft yarns by a plied twist method. FIG. 2 is a schematic diagram of manufacturing a composite yarn weft woven base fabric by a covering method. FIG. 4 is a schematic diagram of wefts created by the covering method. It is a photograph of the weft created by the covering method. 1 is a photograph of a composite yarn weft woven base fabric (back side) manufactured using weft yarns by a covering method. FIG. 3 is a schematic diagram of the FLW base fabric before needle hunting; FIG. 4 is a schematic diagram of the FLW backing during needle hunting. 1 is a schematic diagram of an artificial lawn using FLW base fabric; FIG. It is a photograph of the surface of the FLW base fabric. It is a photograph of the back side of the FLW base fabric.

The composite yarn weft woven base fabric 100 according to the present invention will be described below in more detail while comparing it with the prior art (FLW base fabric).

For tennis courts, soccer practice grounds, baseball fields, etc., artificial grass is used, which is made by weaving polypropylene, polyester, etc. for the warp and weft, and tufting the pile yarn into the base fabric and bonding it with latex, etc. be done. In order to cope with severe usage conditions, it is important that the physical properties of the base fabric itself are high and that the base fabric and the pile yarn are integrally fixed. In addition, low elongation and low heat shrinkage are preferable in order to keep the dimensional change small after being laid as an artificial lawn.

A conventional technique will be described. 11 and 12 are schematic diagrams of a layered base fabric for artificial grass (FLW base fabric) 200 according to the prior art. Since sufficient adhesive strength cannot be obtained with a base fabric made of polypropylene tape or the like and latex, the adhesive strength is improved by integrally adhering a part of the web overlaid on the base fabric.

FIG. 11 shows the state of the base fabric before needle punching. A web 230 made of a plurality of non-woven fabrics in which polyester staples (short fibers) are evenly distributed is overlaid on the fabric made of the warp yarns 210 and the weft yarns 220 . FIG. 12 shows a state in which needle punching is being performed. The staples are entangled with the base fabric by needle punching from above the web, and some of the staples are protruded to the back side of the base fabric. Based on the punching adjustment, the amount of staples that pops out is controlled to about several percent of the total web amount. The adjustment is performed by the number of penetrations (n/cm ² : number of punctures per unit) and the needle depth (the depth of the needle that punctures the base fabric).

FIG. 13 is a schematic diagram of a FLW base fabric 200 with piles. In the tufting process, the pile is pierced from the back side of the above-mentioned FLW, and latex is applied to the back side of the staple and the pile that protrudes a little, so that the staple, the pile, and the base fabric body (warp and weft) are integrally bonded. . Although breakage of the base fabric by punching is unavoidable, in order to minimize the breakage, it is necessary to distribute the staples evenly while reducing the amount of staples protruding to the back side as much as possible.

FIG. 1 is a schematic diagram of a composite yarn weft woven base fabric 100 according to the present invention. The weft yarn 120 is a composite yarn in which a flat yarn 121 and a sliver 122 are combined. As described above, the sliver 122 is not twisted, and fluff 123, which is part of the single fibers forming the sliver, is irregularly extended around the sliver. The fineness of the sliver is preferably 300 dt to 2000 dt, and the fineness of the single fiber of the fluff 123 is preferably 6.6 d or more in order to exhibit the above-described wedge effect, but neither is limited. The weft yarn 123, which is a composite yarn having fluff, is woven, and together with the warp yarn 110, constitutes the composite yarn weft woven base fabric 100 according to the present invention.

As a method for joining the flat yarn 121 and the sliver 122, there is a twisting method in which the flat yarn 121 and the sliver 122 are wound together. Since the sliver 122 is wound around the flat yarn 121, fluff 123 appears in a uniform distribution on the woven base fabric. The material of the sliver 122 can be arbitrarily selected in relation to the adhesive material, latex.

FIG. 3 shows a method (twisting method) in which the flat yarn 121 and the sliver 122 are fed simultaneously and twisted together using a ring spinning machine 131 to produce the composite yarn weft woven base fabric 1 . Moreover, FIG. 4 is a schematic diagram of the weft 130 by a pliing and twisting method. The flat yarn 121 and the sliver 122 are wound alternately, and the fluff 123 extending from the sliver 122 appears on the surface of the weft 130 in a uniform distribution. The wide and thin tape-shaped flat yarn 121 may be deformed into a bent shape by twisting. At that time, the sliver 122 may be caught inside the bend. However, since the sliver according to the present invention is not twisted, the fluff 123 is wound around the sliver in a stretched state. Therefore, the fluff can be integrated with the pile yarn without remaining inside the bend, and can enter the latex to exhibit a wedge effect.

As another binding method, there is also a method (covering method) in which the flat yarn 121 and the staple (including the sliver 122) are arranged side by side and tied together with a thin thread. 7 and 8 show a form in which the flat yarn and the sliver 122 are combined. FIG. 7 shows a method in which the flat yarn 121 and the sliver 122 are fed at the same time, and the cover yarn 142 is used to tie them together by the covering spinning machine 141 without twisting them together. Also, FIG. 8 is a schematic diagram of the weft 140 by the covering method. In the covering method, the flat yarn 121 and the sliver 122 are not wound alternately, and the sliver is placed side by side with the flat yarn and integrated with the cover yarn. However, the sliver side is not always on the back side of the composite yarn weft woven base fabric due to binding of the cover yarn and twisting during feeding to the loom.

Although the above-described two methods are preferable for the method of bonding the flat yarn 121 and the staple (including the sliver 122) according to the present invention, the method is not limited to them.

FIG. 2 is a schematic diagram of an artificial lawn using the composite yarn weft woven base fabric according to the present invention. The warp threads are omitted. When the pile yarns 310 are spread on the composite yarn weft woven base fabric and then bonded, the fluff 123 extending on the back side of the base fabric and the pile yarns 310 are integrally bonded. The fluff 310 having a certain fineness penetrates into the adhesive by a wedge effect and is strongly adhered. Since the fluff is a part of the sliver 122 forming the weft 120 and can be said to be an inseparable portion constituting the weft 120, the pile yarn 310 and the weft 120 including the fluff 123 are integrally bonded. In the FLW backing, it is the protruding portion of the nonwoven that is integrally bonded with the pile yarns 310, not the weft (or warp). The pile yarn and the main body of the base fabric are indirectly connected. In this respect, the main body of the composite yarn weft woven base fabric according to the present invention is directly connected to the pile yarns and is held more firmly.

Examples and comparative examples are shown below, but the present invention is not limited to these examples. Incidentally, the measured values of physical properties shown in Examples and Comparative Examples were obtained by the following methods.
1) Fixed length machine Asano Kikai Co., Ltd. Measurer (10m)
2) Fineness measurement (electronic balance: weight of 10 m)
Shimadzu Corporation ELECTRONIC BALANCE TYPE UX2200H
3) Strength and elongation For thread: 300N manufactured by Asano Kikai
For cloth: AUTOGRAPH AGS-X 5KN manufactured by Shimadzu Corporation
4) Heat shrink Constant temperature dryer DKN402
5) Number of twisted yarns 25cm twist detector

A flat yarn made of polypropylene with a fineness of 1280 dt (width: 4.4 mm, thickness: 30 μm) and a sliver made of polyester with a fineness of 1562 dt (single fiber fineness: 8.8 dt) (fiber length: 84 mm) were inserted into the ring spinning machine. , and plied and twisted at a twisting number of 160 turns/m to prepare the weft according to the present invention. Also, 550 dt (width: 1.1 mm, thickness: 50 μm) black flat yarn made of polypropylene was used as the warp. The densities of the weft and warp were 24 warp/2.54 cm and 13 weft/2.54 cm, and plain weaving was performed to prepare the composite yarn weft woven base fabric according to the present invention.

The form of Example 1 is shown. FIG. 5 shows a photograph of the weft yarn 130 twisted using the ring spinning machine 131 . A black flat yarn 121 is present in the core (center), and the flat yarn 121 is wrapped with a sliver 122 .

FIG. 6 shows a photograph of a composite yarn weft woven base fabric 100 woven using weft yarns by the plied-twisting method. The warp threads 110 extend in the vertical direction, and the weft threads 130 extend in the horizontal direction. A large number of fluffs 123 extend from the weft. Compared with the appearance of staples in the FLW base fabric (Photo 15), which will be described later, the composite yarn weft woven base fabric by the pliing and twisting method according to the present invention rather has a large number of fluffs.

The measurement conditions according to Example 1 are a fabric width of 5 cm for strength and elongation, a chuck distance of 20 cm, and a heat shrinkage of 130° C. for 15 minutes. The physical properties of the woven laminated base fabric will be described later.

The structure of the polypropylene base fabric was the same as in Example 1, and the weft yarn obtained by the pliing was also the same, and only the weft density of the base fabric was 9 wefts/2.54 cm.

The measurement conditions were strength and elongation with a fabric width of 5 cm, a gap between chucks of 20 cm, and heat shrinkage at 130° C. for 15 minutes. The physical properties of the woven composite yarn weft fabric will be described later.

Polypropylene black 1280 dt flat yarn (width: 4.4 mm, thickness 30 μm) and polyester 1562 dt fineness (single fiber fineness 8.8 dt) sliver (fiber length 84 mm) are aligned and put into the covering machine. The wefts were prepared by inserting and binding the two with cover yarns 142 made of nylon. Also, 550 dt (width: 1.1 mm, thickness: 50 μm) black flat yarn made of polypropylene was used as the warp. The densities of the wefts and warps were 24 warps/2.54 cm and 13 wefts/2.54 cm, and plain weaving was performed to prepare the composite yarn weft woven base fabric according to the present invention. The number of turns of the cover thread 142 was 167 times/m.

The form of Example 3 is shown. FIG. 9 shows a photograph of weft yarns 140 bonded using a covering machine 141 . The flat yarn 121 is a black portion extending vertically from the right end of the weft yarn 140 . A thin thread crossing from the upper right to the lower left of the central portion is the cover thread 142 . In this method, since the flat yarn 121 and the sliver 122 are pulled out in parallel, the mode in which they are juxtaposed and bound continues.

FIG. 10 shows a photograph of a composite yarn weft woven base fabric 100 woven using weft yarns by the covering method. The warp threads 110 extend in the vertical direction, and the weft threads 130 extend in the horizontal direction. A large number of fluffs 123 extend from the weft. A large number of fluffs 123 also appear in the composite yarn weft woven base fabric by the covering method, as in the case of the plied twist method.

The measurement conditions according to Example 1 are a fabric width of 5 cm for strength and elongation, a chuck distance of 20 cm, and a heat shrinkage of 130° C. for 15 minutes. The physical properties of the woven composite yarn weft fabric will be described later.

The structure of the polypropylene base fabric was the same as in Example 3, the weft yarns obtained by the covering method were also the same, and only the weft density of the base fabric was 9 wefts/2.54 cm.

The measurement conditions were strength and elongation with a fabric width of 5 cm, a gap between chucks of 20 cm, and heat shrinkage at 130° C. for 15 minutes. The physical properties of the woven composite yarn weft fabric will be described later.

The condition and physical properties of the FLW base fabric with staples on the rear surface were confirmed by the conventional needle punch method. The base fabric used was the same as in Example 1, including fineness and density. Polyester staple with a web amount of 70 g/m ² (minimum amount for uniform distribution) was used as a needle punching condition. As for needling, the number of penetrations (the number of piercings per unit): 49.7/cm ² , in order to minimize the breakage of the base fabric and to control the amount of staples to be put out on the back side as much as possible from the relationship of adhesion suitability. The depth (the depth of the piercing needle) was set to 7.5 mm. This control is the key, but if the amount of staple is too small, the adhesive strength will be insufficient, and if the amount of staple is too large, the amount of latex used will increase.

FIG. 14 shows the surface (upper surface) of the FLW base fabric after weaving. Shows a dense web of staples. FIG. 15 shows the back surface (lower surface). A staple ejected by needle punching is shown.

The measurement conditions were strength and elongation with a fabric width of 5 cm, a gap between chucks of 20 cm, and heat shrinkage at 130° C. for 15 minutes.

Based on the above-described examples and comparative examples, the physical properties of the composite yarn weft woven base fabric according to the present invention and the physical properties of the FLW base fabric (conventional base fabric) will be compared.

Examples 1 and 3 with the same weave density as the comparative example are described. The strength of the FLW base fabric is 1076N warp and 1155N weft in the base polypropylene base fabric (before needle punching), but after needle punching, the strength is reduced to 988N warp and 674N weft. In particular, wide and thin weft flat yarns are severely damaged by needle punching, and their strength is extremely reduced.

On the other hand, the composite yarn weft woven base fabric according to the present invention (weft density of 13 wefts/2.54 cm under the same conditions) has no decrease in strength compared to the base polypropylene base fabric. The warp strength is 1062N for the twisting method, 1081N for the covering method, and FLW before needle punching.
Almost the same as the base fabric. In addition, the weft strength exceeds the strength of the FLW base fabric before needle punching in the 1435N plied twist method and the 1231N covering method. Compared with the FLW base fabric after needle punching, the composite yarn weft woven base fabric according to the present invention has a warp slightly higher than 10% and a weft much higher by about 2 times in any method. It is presumed that this is due to the bonding of the slivers. The increase in strength is greater in the plied-twisting method in which slivers are laid side by side than in the covering method in which slivers are arranged side by side.

Compare weights. The basis weight of the FLW base fabric is 124.2 g/m ² for the base polypropylene base fabric, and 205.5 g/m ² for the FLW base fabric overlaid with the web. On the other hand, it is 205.3 g/m ² in the twisting method and 201.6 g/m ² in the covering method, which are almost equivalent to the FLW base fabric. It shows that it achieves much higher strength than the FLW substrate without increasing the weight.

Examples 2 and 4 with a weft arrangement of 9 wefts/2.54 cm will be described. The warp strength is 1053 N in Example 2 (twisting method) and 1079 N in Example 4 (covering method), which are almost the same as the FLW base fabric before needle punching, and the FLW base fabric after needle punching. is higher than The weft strength was 1006 N in Example 2 and 791 N in Example 4, both of which exceeded the strength of the FLW base fabric after needle punching. In particular, the strength of Example 2 (twisting method) greatly exceeds the strength of the FLW base fabric. The basis weight of Example 2 is 155.5 g/m ² and the basis weight of Example 4 is 153.9 g/m ² , which are about 25% lighter than the FLW base fabric.
In other words, in any method, it is shown that the strength is increased while the weight is reduced.

As for the elongation, the FLW base fabric (after needle punching) has 13.7% warp and 6.9% weft, whereas at the same weaving density, the composite yarn weft woven base fabric of the plied twist method has 19 warp. 9%, weft 16.0%, and the covering type composite yarn weft woven base fabric is 18.0% warp and 12.5% weft. In the case of Examples 2 and 4 in which the weft arrangement was 9 wefts/2.54 cm, the composite yarn weft-made woven base fabric of the plied-twisting method was 16.0% warp, 15.8% weft, and the covering method composite yarn. The weft woven base fabric has 15.7% warp and 12.3% weft. Both of them have a greater elongation than the FLW base fabric.

In addition, the thermal shrinkage of the FLW base fabric (after needle punching) is 1.9% warp and 1.2% weft, while the composite yarn weft woven base fabric with the same weaving density is 2 warps. 0.8%, weft 1.6%, covering type composite yarn weft woven base fabric is warp 2.1%, weft 0.9%. In the case of Examples 2 and 4 in which the weft arrangement was 9 wefts/2.54 cm, the composite yarn weft woven base fabric of the plied twist method was 2.5% warp, 2.0% weft, and the covering method composite The yarn-weft woven base fabric has 2.3% warp and 1.5% weft. In general, the thermal shrinkage value is larger than that of the FLW base fabric.

From the viewpoint of changes in dimensions over time after construction, it is preferable that the elongation and thermal shrinkage are small, but the physical properties of the composite yarn weft woven base fabric by the plied twist method and the covering method are not at a level that is particularly problematic. .

INDUSTRIAL APPLICABILITY The present invention improves the durability of artificial turf, particularly artificial turf used in harsh sports and the like, and has great industrial applicability.

100 composite yarn weft woven base fabric
110 warp 120 weft 121 weft flat yarn 122 sliver 123 fluff 130 weft (twisting method)
131 ring spinning machine 140 weft (covering method)
141 Covering spinning machine 142 Cover yarn 200 FLW base cloth 210 Warp yarn (FLW)
220 weft (FLW)
230 Web 240 Needle 250 Staple 300 Artificial grass 310 Pile yarn

Claims (4)

A base fabric woven with flat yarns drawn from a thermoplastic resin as warps and wefts, wherein the wefts are composite yarns in which the flat yarns wider and thinner than the warps are combined with sliver, and The warp and the composite for artificial lawn are bonded by twisting the flat yarn and the sliver or by winding a cover yarn with the flat yarn as a core material and the sliver as a sheath material. Base fabric woven from weft yarn A base fabric obtained by weaving the warp yarn and the weft yarn, which is the composite yarn, for an artificial lawn according to claim 1, wherein the fineness of the single fibers constituting the sliver is 6.6 dt or more. After tufting the pile yarn to the base fabric obtained by weaving the warp and the weft that is the composite yarn for the artificial lawn according to claim 1, the pile yarn and the weft that is the composite yarn are tufted on the back surface of the base fabric. Artificial lawn characterized by being subjected to adhesion processing A flat yarn obtained by stretching a thermoplastic resin is used as a warp, and the flat yarn and the sliver , which are wider and thinner than the warp, are twisted together or the flat yarn is used as a core material to form the sliver . The warp and the weft for artificial lawn are manufactured by weaving the warp and the weft with the composite yarn, which is bound by winding the cover yarn as a sheath material, as the weft. Fabric manufacturing method

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