JP3418334B2 - Base cloth for artificial grass - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a base fabric for artificial grass having water permeability. 2. Description of the Related Art In order to form an artificial turf which is laid indoors and outdoors to prevent rainwater and discharged water from forming a pool, water is imparted to a base cloth thereof. Various methods have been tried. As one of them, the method of using the mesh fabric as the base fabric requires the use of twisted yarns to weave the mesh fabric, which increases the twisting process and reduces the weaving efficiency of the mesh fabric. In addition, there is a problem that the cost is increased, and a yarn pull-out occurs in a step of implanting the pile yarn. Although a method of perforating the base fabric with a hot needle has been adopted, there are also problems such as an increase in the number of perforating steps and damage to the base fabric due to the hot needle, resulting in a decrease in strength. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an arbitrary water permeability without lowering the strength of a base fabric, pulling out yarn during a production process, or lowering productivity. It is an object of the present invention to provide an artificial turf base fabric that can be set at a time. Means for Solving the Problems [0004] The present invention provides a method for technically solving the above-mentioned problems by tufting pile yarn.
Later, backing processing is applied to the base fabric to form artificial grass.
A low-melting polyolefin filament yarn is interwoven with a warp and / or a weft of a woven fabric made of a high-melting polyolefin filament yarn in a composition ratio of 1 to 20/2 inches, and is less than the melting point of the high-melting polyolefin, Po
If the backing process was applied above the melting point of the polyolefin
The low-melting polyolefin filament yarn
An object of the present invention is to provide an artificial turf base cloth characterized in that the base cloth drops off from the cloth structure and is opened to generate a water-permeable effect , thereby solving the above-mentioned problems. [0005] In the artificial turf base fabric of the present invention having the above-described structure, after the pile yarn is toughened on the base fabric, the low-melting-point polyolefin filament yarn is melted by heating in the backing process and falls off from the base fabric structure to form a hole. However, a water permeability effect occurs due to the gap generated there. In the above process, it is possible to provide water permeability without adding any additional process to the ordinary process, so that it is possible to provide an artificial grass base cloth excellent in productivity and economical water permeability. it can. If the composition ratio of the low-melting polyolefin filament yarn is too large, the pile gripping force after the low-melting polyolefin filament yarn falls off may be reduced. By setting, it is possible to maintain pile gripping force and to set an arbitrary water permeability. DETAILED DESCRIPTION OF THE INVENTION The high-melting polyolefin and the low-melting polyolefin referred to in the present invention are a combination of two or more polyolefins having different melting points. It melts at high temperatures. And, the melting point difference between the high melting point polyolefin and the low melting point polyolefin is at least 20.
C. or higher, more preferably 30.degree. C. or higher. More specifically, as the high melting point polyolefin,
Examples include polypropylene, propylene-ethylene copolymer, and high density polyethylene. These high melting point polyolefins may be used alone or in combination of two or more. [0008] Specifically, as the low melting point polyolefin,
Ultra-low density polyethylene, low density polyethylene, linear low density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-alkyl acrylate copolymer, ethylene / α produced using metallocene catalyst
-Olefin copolymers, syndiotactic polypropylene and the like. These low melting point polyolefins may be used alone or in combination of two or more. As the form of the filament yarn, a flat yarn or a split yarn has a pile yarn gripping force,
It is preferable because it has excellent toughness and the like. The fineness of the filament yarn is preferably 100 to 2000 denier (hereinafter abbreviated as d), and more preferably 300 to 1500 d. The method of forming the above-mentioned polyolefin flat yarn is to melt-extrude the raw material polyolefin with an extruder, form a film by a T-die method or an inflation method, slit, stretch, and then heat-treat to form a flat yarn. I do. The stretching is performed at a temperature lower than the melting point of the polyolefin and higher than the softening point. The stretching ratio is preferably 3 to 15 times, more preferably 5 to 10 times. [0011] The method of forming the above-mentioned polyolefin split yarn is to form a film in the same manner as the above-mentioned polyolefin flat yarn, and then rotate a roll in which a file, a needle and a blade are implanted at a high speed to damage or cut the film. , And can be formed by a known method of finely dividing at the same time as stretching. The artificial turf base fabric of the present invention comprises a woven fabric using such high-melting-point polyolefin filament yarn and low-melting-point polyolefin filament yarn as warp and / or weft. As a weaving method, weaving can be performed using a known loom such as a circular loom, a sluser loom, and a water jet loom. Various shapes such as plain weave, twill weave and leno weave are applied as the weave structure. The driving density is preferably from 10 to 24 warp yarns / inch and from 10 to 20 weft yarns / inch. In the above-mentioned base fabric, the high-melting-point polyolefin filament yarn (A) and the low-melting-point polyolefin filament yarn (B) are configured so that the warp and / or the weft of the woven fabric composed of the high-melting-point polyolefin filament yarn (A) have a low melting point. 1-20 polyolefin filament yarn (B)
It is obtained by weaving a book / 2 inches, preferably 1 to 4 books / 2 inches. Further, specific arrangements within the above composition ratio range include a method of arranging (B) one by one between (A) and a method of arranging (B) two by two (A). And the like. The method of arranging (B) two by two is preferable in a suitable method since (B) is melted and opened to form an appropriate gap. In the base fabric, the composition ratio of (B) / (A) in the total warp yarn is preferably 1 to 50%, more preferably 4 to 30%. The above composition ratio is 1
If it is less than 50%, the water permeability is not sufficient, and if it exceeds 50%, the gripping force of the pile yarn is undesirably reduced. A pile yarn made of conventionally used nylon, polyester, polypropylene or the like is planted on the base fabric thus obtained, and then backing is performed by a known method. The backing layer is also mainly made of the same polyvinyl chloride, polyolefin resin, etc. as in the past, and the backing processing temperature is preferably lower than the melting point of the high-melting polyolefin and is preferably performed in a temperature range equal to or higher than the melting point of the low-melting polyolefin. , 100 to 140 ° C, and more preferably 120 to 130 ° C. The backing process causes the low-melting-point polyolefin filament yarn interwoven in the base fabric to melt and fall off the base fabric structure to open the pores, thereby producing a water-permeable effect. The polyolefin used in the present invention includes:
Other thermoplastic resins or an antioxidant, an ultraviolet absorber, a light stabilizer, a dispersant, a lubricant, an antistatic agent, a pigment, an inorganic filler, a crosslinking agent within a range not departing from the spirit of the present invention,
Ordinary additives such as a foaming agent and a nucleating agent may be blended. EXAMPLES The artificial turf base fabric of the present invention is evaluated by the following examples. The water permeability test as an evaluation method is as follows. As shown in FIG. 1, an artificial turf fabric P in which pile yarns were planted on a base cloth was adhered to the bottom of the box-shaped container Q, and water W was put up to a height H = 5 cm, and the time until the end of permeation was measured. . Example 1 A film was formed from polypropylene (MFR = 1.2 g / 10 min., Density = 0.90 g / cm ³ , Tm = 161 ° C.) by an inflation method, cooled, slit, and heated. 400 d fineness with 6 times stretching by contact stretching method
And 1250d flat yarn. On the other hand, using high-density polyethylene (MFR = 0.7 g / 10 min., Density = 0.957 g / cm ³ , Tm = 129 ° C.)
A film is formed by an inflation method, cooled, slit, and stretched 5.2 times by a hot plate contact type stretching method to a fineness of 4
00d and 1250d flat yarns were obtained. A warp of 400d polypropylene flat yarn at a driving density of 22 yarns / inch and 1250d
18 flat weft yarns of polypropylene flat yarn
When forming a woven fabric by plain weaving with a driving density of 40 inches,
The high-density polyethylene flat yarn of 0d is replaced by a polypropylene flat yarn as a warp at a composition ratio of 1 / inch, and the 1250d high-density polyethylene flat yarn is replaced by a polypropylene flat yarn as a weft at a composition ratio of 1 / inch. Then, the base fabric was manufactured by weaving. After a pile yarn made of nylon was planted on the base fabric by a tufting method, a backing process was performed on the back surface of the raw material at a backing temperature of 130 ° C. using ethylene-vinyl acetate resin. The heating during this backing process melted the high-density polyethylene flat yarn to form a perforated artificial turf stock. The result of the water permeability test of this artificial turf raw material was 35 seconds. Example 2 When forming a woven fabric by plain weaving in the same manner as in Example 1, 400
d high-density polyethylene flat yarn at a ratio of 1/2 inch as a warp yarn, and 1250 d high-density polyethylene flat yarn as a weft at a ratio of 1/2 inch as a weft yarn. Example 1 was repeated except that the base fabric was manufactured. The water permeability test result of this artificial turf raw material was 90 seconds. Example 3 When forming a woven fabric by plain weaving in the same manner as in Example 1, 400
d, two continuous high-density polyethylene flat yarns are used as warps at a ratio of 2/2 inches, and two continuous high-density polyethylene flat yarns of 1250d are used, two yarns / 2.
The same procedure as in Example 1 was carried out, except that the weft yarns were replaced by polypropylene flat yarns in a composition ratio of inches, and a base fabric was produced by weaving. The water permeability test result of this artificial turf raw material was 17 seconds. Comparative Example When forming a woven fabric by plain weaving in the same manner as in Example 1, 400
d high-density polyethylene flat yarn at 1/5 inch warp ratio, 1250 d high-density polyethylene flat yarn at 1/5 inch configuration ratio as weft yarn, weaving instead of polypropylene flat yarn. Example 1 was repeated except that the base fabric was manufactured. As a result of the water permeability test of this artificial grass material, the water permeability was poor in 10 minutes. As described above, the artificial turf base fabric of the present invention comprises 1 to 20 low-melting polyolefin filament yarns per warp and / or weft of a woven fabric composed of high-melting polyolefin filament yarns. It is made by weaving with a composition ratio of 2 inches. After tufting pile yarn on the base fabric,
Heating in the backing process causes the low-melting polyolefin filament yarn to melt and fall off from the base fabric structure to open holes, and the gap created there creates a water-permeable effect, depending on the composition ratio of the low-melting polyolefin filament yarn. , Water permeability and pile yarn gripping force can be arbitrarily set.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing a water permeability test in the present invention. [Explanation of Signs] P Artificial turf raw fabric Q Square container W Water H Water height

Claims (1)

(57) [Claims] [Claim 1] After tufting pile yarn, backing
In a base fabric which is processed to form an artificial turf , a low melting point polyolefin filament yarn is interwoven with a warp and / or a weft of a high melting point polyolefin filament yarn in a composition ratio of 1 to 20 yarns / 2 inches. , High fusion
Lower than the melting point of polyolefin
When backing is applied above the melting point,
Olefin filament yarn melts and drops off from base fabric
An artificial turf base fabric, characterized in that water is permeated by opening the holes .