KR20080033670A - Artificial turf using hollow fiber - Google Patents

Abstract

Artificial turf using hollow fiber using hollow fiber is provided to have improved moisture regain and moisture content, to have improved shape stability and recovery rate against continuous pressure, and to be manufactured by a direct spinning method. Artificial turf using hollow fiber using hollow fiber includes a base layer(100) designed to show permeability characteristics, a high molecular pad layer(200) having permeability characteristics formed on the upper part of the base layer, a bubble layer(300) formed to set out turf piles on the upper part of the high molecular pad layer, and first and second piles(410,420) having circular shaped filament and hollow fiber formed alternately or at random on the bubble layer. The high molecular pad layer is made of PVC(poly vinyl chloride) to have excellent fire resistance, elasticity and chemical resistance and to double shock absorbing effect on turf, the bubble layer is made of polyolefin based non-woven fabrics, and the first pile is made of circular shaped filament of polyolefin based copolymer and the second pile is made of hollow fiber, and the first and second piles are formed by tufting or knitting.

Description

Artificial turf using hollow fiber {ARTIFICIAL TURF USING HOLLOW FIBER}

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

Figure 2 is a schematic view of the discharge hole of the hollow spinneret according to an embodiment of the present invention.

Figure 3 is a cross-sectional SEM picture of the hollow fiber according to an embodiment of the present invention.

Figure 4 is a SEM cross-sectional SEM picture of the hollow fiber according to an embodiment of the present invention.

<Description of Major Symbols in Drawing>

100: base layer 200: pad layer

300: bubble layer 410: first file

420: second file

The present invention relates to artificial turf using hollow fiber, and more particularly to artificial turf using hollow fiber with improved physical properties such as moisture content and thickness reduction rate.

In general, many ball sports are played on the turf. Natural turf and artificial turf are generally used for turf courts, among which international hockey and domestic hockey are 100% artificial turf. This is due to the international rules of the game. Rolling of the ball is required to form a cloud, and the ball must not bounce. In the case of natural grass, it is difficult to secure the uniformity of the grass height compared to the artificial turf. The artificial turf is used a lot because there are a lot of matches.

Artificial turf, which has been used in the conventional hockey field, is manufactured from a PP (polypropylene, hereinafter PP) pile. In particular, the hockey field is exposed to frequent shocks and abrasions because the game is played in a relatively narrow space compared to other stadiums such as soccer fields. In addition, due to the nature of the game, which should not have irregular bounding, there is no filler, and the load of the athlete is transferred to the artificial turf file as it is, and the direct impact causes damage to the artificial turf file. In the hockey field sensitive to the maintenance of the upright and direction of the pile, PP is widely used because it is required to have excellent impact wear strength among ordinary artificial turf materials.

However, this PP, which is a conventional artificial turf material, has a specific gravity and is lighter than water, and has a hydrophobic characteristic. Therefore, since the moisture content is low and the initial modulus of SS-Curve is higher than other pile materials, it shows a rough characteristic, so that artificial grass for hockey field made of PP is used on the rough surface when the player falls down. There is a problem that injuries such as burns and abrasions are caused by friction.

In order to overcome this problem, the artificial turf arena made of PP piles are sprayed with a large amount of water three or four times before and during the game, thereby maintaining the moisture on the turf to ensure uniform cloudiness of the ball, It prevents static electricity due to hydrophobicity of PP and prevents injuries caused by friction of bows. However, the large amount of water sprayed out evaporates very quickly during the race, which causes athletes to fall on the field or cause serious injury from friction when sliding.

On the other hand, since artificial turf is continuously pressurized, an excellent thickness reduction rate and recovery rate are required. If the height uniformity of the turf is not secured, the turbulence irregularities will not secure the cloud characteristics of the ball, and the injuries of players playing on the turf will frequently occur.

Therefore, recently, in the reality that only natural grass cannot be used due to the damage or the winter season, it is required to develop an artificial turf having excellent thickness reduction rate and recovery rate corresponding to continuous pressure while ensuring the user's stability due to excellent moisture content. ought.

In order to solve the above problems, an object of the present invention is to provide an artificial turf with improved moisture content and moisture content.

It is also an object of the present invention to provide an artificial turf that has improved form stability and recovery rate against continuous pressure.

In addition, an object of the present invention is to provide an artificial turf using a hollow fiber that can be manufactured by a direct spinning method.

The present invention in order to achieve the above object in the artificial turf, a base layer designed to express the permeability characteristics in advance; A polymer pad layer having a permeability characteristic formed on the base layer; Bubble layer for simulating a grass pile on the polymer pad layer; And it provides an artificial turf using a hollow fiber comprising a circular cross-section yarn and hollow yarn 1: 1 or randomly formed pile in the bubble layer.

In another aspect, the present invention provides an artificial turf, characterized in that the pad layer is formed of a polyvinyl chloride-based material.

In another aspect, the present invention provides an artificial turf, characterized in that the bubble layer is formed of a non-woven fabric made of a polyolefin-based.

In another aspect, the present invention includes the first file and the second file is formed of a different material, the first file is a circular cross-section yarn of a polyolefin-based copolymer material, the second file is hollow fiber, the two files An artificial turf having the characteristics formed by the tufting or the raschel is provided.

In another aspect, the present invention provides artificial turf, characterized in that the pile is formed in the horizontal direction of 3.2 to 6.4 pieces / inch, longitudinally 6.8 to 9.8 pieces / inch.

In another aspect, the present invention provides an artificial turf manufactured from the spinnerets for hollow use, characterized in that the hollow portion of the hollow yarn to form a triangular cross-section, the following formula (1) to (4).

(1) 0.08 ≤ B ≤ 0.11

(2) Φ1: Φ2: Φ3 = 1: 1.40 ~ 1.42: 1.83 ~ 1.86

(3) 0.24 ≤ A ≤ 0.27

(4) 0.21 ≤ W ≤ 0.26

Here, B: predetermined width (mm) between the slit crosses

Φ1: inner diameter of the detention hole

Φ2: Outside diameter of the detention hole

Φ3: Outer diameter of protrusion of detention hole

A: area of each discharge hole for slit (S) (mm ² )

W: protrusion width (mm)

In the present invention, the hollow yarn using the spinneret, the discharge amount of the radiopolymer in the unit of the detention unit is 700 to 800 g / min, the cooling temperature is 15 to 30 ℃, the stretching temperature is 80 to 90 ℃, respectively Drying is performed in the other two chambers, and the first chamber is 95 to 105 ℃, the second chamber provides an artificial turf characterized in that it is produced including a drying process of 80 to 90 ℃.

In another aspect, the present invention provides an artificial turf having a crimp rate of the hollow fiber 30 to 40%.

The present invention also provides artificial turf wherein the spin polymer is nylon 66, nylon 6 or a mixture thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention. Although the hollow fiber according to the present invention has been described with an example of applying to artificial turf, the present invention is not limited thereto.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values when manufacturing and material tolerances inherent in the meanings indicated are intended to aid the understanding of the invention. Accurate or absolute figures are used to assist in the prevention of unfair use by unscrupulous infringers.

1 is a cross-sectional view of the artificial turf according to an embodiment of the present invention. Grass according to the present invention is a polymer pad layer 200 having a permeability characteristic is formed on the base layer 100 is designed to express the permeability characteristics in advance, for simulating the grass pile on the polymer pad layer 200 Bubble layer 300 is formed. First and second piles 410 and 420 are formed in the bubble layer 300.

The polymer pad layer 200 may be formed of various materials, and particularly, may be formed of a polyvinyl chloride-based material. It is excellent in fire resistance, elasticity, and chemical resistance can double the impact buffer action of the user who is active in the grass.

In addition, the bubble layer 300 may be formed in a variety of forms, it is particularly preferably formed of a non-woven fabric made of polyolefin-based (especially PP). This will be described in detail in the process of forming a file to be described later.

In an embodiment of the present invention, the first and second piles 410 and 420 may be formed of different materials and shapes. The first pile 410 is a polyolefin-based copolymer material, a circular cross-section yarn, and a second pile 420. ), The circular cross section yarns and the hollow yarns may be alternately formed one to one or randomly formed. The method of modeling the first and second piles 410 and 420 on the bubble layer 300 may be formed by tufting or lazing. The first and second piles 410 and 420 are preferably formed in a horizontal direction of about 3.2 to 6.4 pieces / inch and in a longitudinal direction of about 6.8 to 9.8 pieces / inch. If exceeded, too many files are formed. As a result, the repulsive force for continuous pressure is rather deteriorated, and there is no big difference in cost-performance.

Meanwhile, the hollow fiber used for the second pile 420 may be in various forms, and as one embodiment of the present invention, the following hollow fiber is proposed.

Figure 2 shows a schematic view of the discharge hole of the hollow fiber spinneret according to an embodiment of the present invention. In the spinneret according to one embodiment of the present invention, a triangular cross-section hollow yarn is formed.

The spinneret according to the present invention may be formed as follows.

(1) 0.08 ≤ B ≤ 0.11

(2) Φ1: Φ2: Φ3 = 1: 1.40 ~ 1.42: 1.83 ~ 1.86

(3) 0.24 ≤ A ≤ 0.27

(4) 0.21 ≤ W ≤ 0.26

Here, B: predetermined width (mm) between the slit crosses

Φ1: inner diameter of the detention hole

Φ2: Outside diameter of the detention hole

Φ3: Outer diameter of protrusion of detention hole

A: area of each discharge hole for slit (S) (mm ² )

W: protrusion width (mm)

If the predetermined width (B) between the slit cross is less than the above range, the hollow ratio is lowered, if the range exceeds the above range, there is a problem in spinning workability and when used as artificial turf deteriorates the overall physical properties such as tensile strength. In addition, when the ratio of the value of φ is less than the above, there is a problem in that the width of the yarn cross-section is lowered and the physical properties of the fiber are lowered. This is why the discharge hole area of the individual slits should be within the above range. In addition, when the width (W) of the protrusion (C) is less than the above range, when the polymer spun in each slit at the bottom of the spinneret is fused, unfused parts may occur. Therefore, excessive control of the radial viscosity and the speed is required, and if the range is exceeded, there is a problem that the protrusion excessively protrudes from the circular cross section.

On the other hand, when the hollow fiber according to the present invention is used in artificial turf, moisture is leaked to the outside by the pressure, thereby reducing the surface friction with the user exposed on the artificial turf. Therefore, in the hollow fiber according to the present invention, the thickness reduction rate and recovery rate due to the wear resistance strength and compression are also important properties evaluation factors.

Artificial turf, especially for hockey and soccer fields, because the pile upright and the direction of pile are very important factors, polyolefin-based (especially PP) material with excellent impact wear strength is mainly adopted. However, in the case of PP, the specific gravity is lower than that of water, and the hydrophobic property and the initial modulus of elasticity are high. Therefore, the artificial turf field must spray a large amount of water before or during the race.

However, even if a large amount of water is sprayed on artificial turf such as hockey before or during the game, it plays a role of ensuring uniform rolling of the ball and preventing scratches and burns when the player falls on the field. There is a limit.

The hollow fiber according to the present invention is to use the spinneret, to propose a hollow fiber formed of a polyamide-based polymer. Of the polyamides, in particular nylon 66, nylon 6 or mixtures thereof are also possible. More preferably nylon 6.

 The discharge amount of the polymer in the unit detention is preferably 700 to 800 g / min. If it is less than the above range, the radioactivity is poor and there is a concern that trimming occurs. If the above range is exceeded, the hollow ratio of the spinneret is lowered. The spun yarn is a post-processing at a cooling temperature of 15 to 30 ℃, the stretching temperature of 80 to 90 ℃. If the cooling temperature is less than 15 ℃ causes a decrease in the physical properties of the fiber due to rapid quenching and when the temperature exceeds 30 ℃ there is a problem that the hollow ratio is lowered to 16% or less. In addition, when the stretching temperature is less than 80 ℃, when the drawability is poor and exceeds 90 ℃ there is also a problem that the hollow ratio is lowered to 16% or less. Stretching process The yarns are dried in different temperature chambers. At this time, the first chamber is maintained at 95 to 105 ℃ and the second chamber is maintained at 80 to 90 ℃.

After the drying process, the yarn may be optionally subjected to a crimping process. In the method according to the present invention, it is preferable to form a mixture of a method of directly contacting heat with a yarn and an indirect contact with the yarn, and at this time, crimping The rate is preferably 30 to 40%.

The hollow fiber prepared as described above can maintain the hollow ratio of about 50 to 60%.

Example 1

Artificial grass was prepared as a hollow fiber manufactured according to the following conditions to evaluate the overall physical properties.

1. Hollow fiber condition

(1) spinneret

Hollow spinneret 48 holes designed with B: 0.08, Φ1: 0.84, Φ2: 1.19, Φ3: 1.57, A = 0.26, W = 0.24

(2) Radiopolymer: Nylon 6

(3) radiation conditions

Discharge amount: 712 g / min, Cooling temperature: 25 ℃, Stretch bath temperature: 83 ℃, 1st chamber temperature: 101 ℃, 2nd chamber temperature: 82 ℃, Crimp rate 35%

2. Artificial turf conditions

A permeable PVC pad layer is formed on the permeable ascon base layer, and a non-woven fabric bubble layer is formed as PP to form a 6: 4 ratio of the PP and PE copolymer material and the hollow fiber in a 1: 1 alternating bubble layer. A pile was formed (tufting method). The pile has a density of 32 per 5 inches long and 6.8 per 1 inch wide.

Comparative Example 1

In the same manner as in Example 1, artificial turf was prepared using only a 3: 1 ratio of PP and PE copolymer.

Comparative example  2

In the same manner as in Example 1, a copolymer was formed in the bubble layer in a 1: 1 alternating manner with the copolymer and general nylon 6 having a circular cross section (tufting method).

* Evaluation standard

1. General condition of physical property test

    1.1 Standard condition of the test

        The temperature is 20 ° C ± 2 ° C and the relative humidity is 65% ± 5%.

    1.2 Preparation of Specimen

        The sample is allowed to stand at 1.1 or more for 24 hours.

    1.3 Test Piece Collection Method

        Specimen refers to the finished product except the tester, and the same varieties are taken to be parallel in the vertical and horizontal directions.

2. Tensile Strength

    2.1 Measure the tensile strength (kgf) and elongation (%) with a tensile tester with at least three specimens of 50 mm long and 300 mm long in the direction of warp and weft, with a clamp interval of 200 mm and a tensile speed of 300 ± 20 mm / min. do. * If a slip occurs in the clamp, cut off the pile.

    2.2 Display the average value of three or more light and weft threads to the 3rd significant figure.

3. tear strength

    3.1 Butterfly 76 mm 203 mm long specimens cut 76 mm at the center of the short side at right angles to the edge, with the bite clamped at 76 mm, and the highest five peaks until tearing ends at 305 ± 13 mm / min. The average value (kgf) is obtained by reading the load (excluding the first peak).

    3.2 The average value of five or more warp and weft marks is displayed.

4. Pullout strength (before and after immersion)

   4.1 Sample Collection

       Take four specimens of butterfly 100 mm long and 100 mm long (two before and after immersion).

   4.2 Pullout strength before immersion

       The specimen is attached to the sample holder of the drawing tester, the file is picked up by a file chuck, and the files at each of five locations are loaded at maximum load. The drawing speed is measured at 100 mm / min, and the average value is displayed to the second decimal place. * To make file picking easier, do not cut the file you want to trim and extract around the file you want to measure.

   4.3 Pullout strength after immersion

       After the specimen is completely immersed in general industrial water for 3 hours, it is left for 10 minutes under the standard condition and measured in the same manner as before the immersion.

5. Thickness reduction rate due to dynamic load (%)

   5.1 Test Operation

       Take three round specimens of approximately 175 mm diameter and drill a hole of approximately 6 mm diameter in the center of each specimen. It is then mounted on a rotary dynamic load tester and subjected to the load measurement.

   5.2 Measurement and Calculation

       After the impact load is left for 5 minutes, the thickness (mm) is measured at three or more places within the area to which the impact load is applied.

        * (The number of shocks is 1000, 5000, 10000 times, the other number is specified.)

           Thickness Reduction (%) = ｛(t1-t2) / t1｝ x 100

              t1: Thickness before applying impact load (mm)

              t2: predetermined number of impacts, thickness after applying impact load (mm)

6. wear strength

   6.1 Test Operation

       Collect at least three round specimens of approximately 130 mm in diameter, drill a 6 mm diameter hole in the center and place the specimen surface upward on the abrasion strength tester. Using 38 wheels, rotate and rub against the direction of specimen rotation at approximately 70 rpm.

   6.2 Measurement and Calculation

       Weight reduction measures weight loss after friction and displays the average value up to three significant figures.

       * The prescribed number of times and the wear wheels used should be clearly stated.

       * Result (%) = ｛(Weight before test (g)-Weight after test (g)) / Weight before test (g)｝ x 100

7. Thickness reduction rate due to static load (%)

   7.1 Sample Collection

       A total of five samples (over 500 mm wide) are taken from different rolls. Take specimens of size 140 mm in diameter at the left, middle, and right sides of each sample.

   7.2 Test Equipment

       (1) Measuring rod: 60mm in diameter, 8300g weight pole

       (2) trivets supporting the pillar

       (3) GAUGE, CELL for thickness measurement

    7.3 TEST Method

       (1) Take three test specimens for each sample and test three average values as the measured values of the sample. At this time, each specimen shall be taken from the left, middle and right of the sample.

       (2) Place the cell on the sample and measure the initial height. (A)

       (3) Leave this specimen pressed for 24 hours with a metal column of 8300 g in weight and 60 mm in diameter. (Keep the standard standby)

       (4) Measure the height of the pile after 24 hours. (B)

       (5) Leave the measured specimen for 5 minutes again and measure the PILE height at that time. (C)

    7.4 TEST Results

       (1) Compression Ratio:-(A-B) / A｝ x 100

       (2) Reduction Rate:-(A-C) / A｝ x 100

       (3) Recovery rate: ｛(C-B) / (A-B)｝ x 100

8. Dimensional rate of change (shape stability)

    8.1 Test Method

       (1) Take the test piece 300mm horizontally and vertically, and insert the pins exactly 125mm up, down, left and right from the center of the test piece. Measure the length.

       (2) Soak for 3 hours in general industrial water and remove it from water and measure the changed length.

       (3) After that, the changed length is measured after leaving the oven at 60 ℃ for 24 hours, and the changed length is again measured after 1 hour at standard temperature and humidity.

    8.2 Test Results

       (1) Measure the rate of dimensional change using the aggregated data.

           *% Of dimensional change = (varied length / standard length) x 100

9. Moisture Content

    9.1 Test Methods and Results

        Take 200 mm wide and 200 mm long specimens and leave for 1 hour under standard conditions. After weighing the test specimen, it was dried for 1 hour in a hot air dryer set at 80 ℃. After drying, the sample is taken out, weighed, and calculated by the following equation.

        Moisture content (%) = (Weight before drying-Weight after drying) / Weight after drying x 100

Evaluation results of Examples and Comparative Examples according to the evaluation criteria are shown in Table 1.

Artificial turf produced by the hollow fiber according to the present invention shows a high moisture content of 1.69% compared to the water content of 0.51% of the conventional PP material, as shown in Table 1, the conventional recovery of hockey field grass (comparative example 1) is 4.85% On the other hand, it is high as 16.67%.

As described above, the artificial turf using the hollow fiber according to the present invention has an advantage of excellent moisture content, in particular, the effect of remarkably improved thickness reduction rate and recovery rate for continuous pressure.

In addition, since the hollow fiber according to the present invention has excellent elastic recovery rate, it is advantageous to secure the upright of the pile and improves the surface touch of the artificial turf.

The hollow fiber with such physical properties, when used as artificial turf, especially artificial turf for hockey field or soccer field, can prevent the frictional images of players as well as secure stable cloudiness of the ball due to low evaporation rate and high water retention rate. .

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

Claims (9)

In artificial turf, A base layer designed to express permeability characteristics in advance; A polymer pad layer having a permeability characteristic formed on the base layer; Bubble layer for simulating a grass pile on the pad layer; And Circular section yarns and hollow yarns in the bubble layer artificial turf using a hollow fiber, characterized in that it comprises a file alternately formed or randomly. The method of claim 1, The pad layer is artificial turf, characterized in that formed of a polyvinyl chloride-based material. The method of claim 1, The foam layer is artificial turf, characterized in that formed of a non-woven fabric made of a polyolefin. The method of claim 1, The pile includes a first pile and a second pile formed of different materials, the first pile is a circular cross-section yarn of a polyolefin-based copolymer material, the second pile is hollow fiber, the two piles are tufted or Artificial turf having characteristics formed by raschel. The method of claim 1, The pile is artificial turf, characterized in that formed in the transverse direction 3.2 to 6.4 pieces / inch, longitudinal direction 6.8 to 9.8 pieces / inch. The method of claim 1, Artificial turf produced from the spinneret for hollow use, characterized in that the hollow portion of the hollow yarn to form a triangular cross section, the following formula (1) to (4). (1) 0.08 ≤ B ≤ 0.11 (2) Φ1: Φ2: Φ3 = 1: 1.40 ~ 1.42: 1.83 ~ 1.86 (3) 0.24 ≤ A ≤ 0.27 (4) 0.21 ≤ W ≤ 0.26 Here, B: predetermined width (mm) between the slit crosses Φ1: inner diameter of the detention hole Φ2: Outside diameter of the detention hole Φ3: Outer diameter of protrusion of detention hole A: area of each discharge hole for slit (S) (mm ² ) W: protrusion width (mm) The method of claim 1, The hollow yarn using the spinneret according to claim 6, The discharge amount of the radiopolymer in unit detention is 700 to 800 g / min, Cooling temperature is 15 to 30 ℃, stretching temperature is 80 to 90 ℃, Drying in two different chambers The first chamber is 95 to 105 ℃, the second chamber is artificial turf, characterized in that it is produced including a drying process of 80 to 90 ℃. The method of claim 7, wherein Artificial turf having the crimp rate of the hollow fiber is 30 to 40%. The method of claim 7, wherein The radiopolymer is artificial grass, nylon 66, nylon 6 or a mixture thereof.

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