KR20110123600A - The method of preparing artificial lawn - Google Patents

Abstract

PURPOSE: An artificial turf manufacturing method is provided to prevent artificial turf from being easily fallen down by forming a support and an auxiliary support in the artificial turf. CONSTITUTION: An artificial turf manufacturing method is as follows. Thermoplastic resin is extruded through an extruder having 150-250°C. Supports(1) corresponding to the thick sections of artificial turf are formed on the front and rear surfaces of the artificial turf. Auxiliary supports(2) are formed on both surfaces of the artificial turf to be contiguous to the supports. Thin sections(3) are formed in the edge of the artificial turf. The artificial turf is extruded through a mold. Waves are formed in the edge of the artificial turf by dipping the artificial turf in hot water and completely solidifying the artificial turf.

Description

The method of preparing artificial lawn

The present invention relates to a method of manufacturing artificial turf, and more specifically, using a thermoplastic resin having a flexible texture and extruding artificial turf, but having a central portion along the longitudinal direction of the artificial turf having a predetermined width and a thin edge. The difference between the heat conduction of the thick part (hereinafter called thick part) and the thin part (hereinafter called thin part) in the center by drawing through the hot water tank maintained at 50 ~ 70 ℃ while simultaneously extruding into the mold to make it possible. Because of the circular restorability of synthetic resin and synthetic resin, the purpose of manufacturing artificial turf with a wave shape at the edge of artificial turf by using the difference of elongation and contraction of the thick part and the thin part and the circular restorability is provided.

Natural grass has long been used for garden landscaping and golf fairways and is still widely used for this purpose. In recent years, in order to protect players of various sports, baseball field, soccer stadium, various stadiums, and even school grounds have been using natural grass.

However, the natural grass growing in the athletic stadium is severely damaged by the digging, cutting, and tearing of the grass due to the intense competition, and the floor surface is partially raised, which causes the game to be uneven.

In addition, it takes a long time for the grass to grow back to its original shape in the area where the dig occurs, and if it is severely damaged, it is necessary to work the grass again on the damaged part.

 Because of these shortcomings of natural grass, in recent years, banded pratyan, round monofilament, and azure based on synthetic resins such as polyamide, polyester, PP, PVC, and PE that have strong physical properties including tensile strength `The artificial grass produced by extruded or spun with fine fiber yarn and planted on the fabric is piled and raised to synthetic fabric or rubber foam sheet, sponge sheet, rubber sheet, and the mated sheet is laid on the floor. It is being replaced by a turf arena.

The artificial turf of the synthetic resin is made of polyamide, polyester, polypropylene, polystyrene, and is extruded or spun before and after each synthetic resin melting point by adding common additives including a sunscreen, an anti-aging agent, a flame retardant, and a pigment. The artificial turf is manufactured from fiber yarns in the form of band-shaped flat yan, round monofilament, and very fine filament-focused yarns. At present, artificial turf made of round monofilament or fiber yarn Except for special cases, it is rarely used, and band-type pratyan is most frequently used.

Such a conventional band-shaped flat yarn has been used as artificial turf with a flat yarn of 1.5 to 2 mm in width and 0.1 to 0.3 mm in thickness by the extrusion method using the above-mentioned thermoplastic resin.

To date, artificial turf has not found artificial turf outside the above-described artificial turf category.

For example, artificial grass as a conventional technology, Korean Patent Laid-Open Publication No. 10-2007-35003 discloses a method for producing a synthetic fiber for use in artificial turf stadiums and a technology related to the synthetic fiber, namely, artificial turf. In the method of manufacturing synthetic synthetic fibers, artificial turf obtained by co-extrusion with at least one synthetic material (synthetic resin) having different physical properties may be extruded into a band-shaped flat yarn. Such band-shaped artificial turf can be divided into lengthwise or multiple layers, and the physical properties of each synthetic material (synthetic resin) can be exerted on the artificial turf. It can be called artificial turf that can be separated. In any case, the artificial turf of the invention is also artificial turf of a band-like prat yarn.

As an example of another prior art, Korean Patent Laid-Open Publication No. 10-2002-43461 relates to an artificial turf structure exclusively for football, wherein artificial turf strands of monofilament yarns formed on a bottom plate of a mat constituting a structure (artificial turf mat) are artificial. It can be called artificial turf layer which is planted between grass liquor (band-like pratyan artificial turf). The artificial turf used in this artificial turf layer is also artificial turf of monofilament and band-shaped pratyan, and cannot escape the conventional artificial turf.

As another conventional technology, Korean Utility Model Publication No. 20-230073 describes artificial turf structure of artificial turf playground for soccer, and artificial turf that is planted on artificial turf structure also has fine filament of fiber An artificial turf mat formed by planting between piles of banded piles (band-shaped platelets) is also used as monofilament or band-shaped plate yarns of Sisa.

Examples of the prior art are that the structure of the mat composed of artificial turf is various and complex, but the artificial turf of the artificial turf layer formed on the structure is artificial fiber of fiber fiber, monofilament yarn, band-like prat yarn It does not escape Such artificial turf is slightly different depending on the type of synthetic resin, but generally lacks the bearing capacity. In particular, fiber microfiber monofilament clusters and prattyan artificial turf have weaker bearing capacity and will fall into the mat layer during long-term use due to rain or player load or impact shear force. In addition, the artificial turf of the band-shaped Prattyan is flat and straight, so it has high reflectivity and lack of denseness and fullness.

Artificial turf according to the present invention is an artificial turf that improves the shortcomings of the band-type flat yarn artificial turf, which is most frequently used among artificial turf, and reinforces the bearing capacity of artificial turf to prevent it from lying down and also reflects by sunlight or light Method of manufacturing artificial turf that can prevent artificial turf from being easily detached from the mat and at the same time, even if the same amount of artificial turf is planted on the artificial turf by reducing the level In providing grass.

A thick support is formed at the central portion of the band-shaped pratyan artificial turf in the longitudinal direction, and parallel to the support, an auxiliary support is formed on both sides, and the edge is extruded into an artificial turf mold having a thin portion, and at the same time, The method of manufacturing a band-shaped artificial turf which gives a texture of natural turf formed on both edges of the artificial turf due to heat deformation and circular return by drawing out immediately after passing the heat bath at 50 ~ 70 ℃ and providing the artificial turf The problem of the invention was solved.

Turf according to the present invention, unlike the conventional band-type pratyan grass can greatly reduce the reflectance caused by sunlight or light, so as not to interfere with the competition of athletes can reduce the fatigue and support and auxiliary support is formed It is a method of manufacturing artificial grass and its artificial turf, which can reduce grass fall easily, and show bulkiness by twisting and corrugating to give denseness and fullness and texture of natural grass.

1 is a perspective view of a conventional band-type prattyan artificial grass.
Figure 2 is a perspective view of the shape of artificial turf during extrusion in the invention of the present invention.
Figure 3 is a perspective view of the artificial turf of the finished product of the present invention.

The artificial turf according to the present invention is a modified artificial turf of the band-type pratyan artificial turf (A) of FIG. 1, which is used most conventionally, and the artificial turf modified during extrusion by a mold is a band as shown in FIG. 2. It has the shape of artificial turf of shape pratyan, but along the longitudinal direction of artificial turf, the support (1) is made of thick part in the center and the auxiliary support (2) is formed on both sides in parallel with the support and the edge is thin ( 3) is artificial turf formed.

In addition, Figure 3 is a wave (4) formed on both edges of the artificial turf by immersing the artificial turf of Figure 2 in the form of extrusion of artificial turf in the hot water tank maintained at a temperature of 50 ~ 70 ℃ while drawing Artificial turf perspective view of the finished product.

Looking at the manufacturing method of artificial turf as described above,

As a raw material of the present invention, a method of manufacturing artificial grass may be used as a raw material of polyamide, polyester, PVC, polyfuropyrene, and polystyrene, but polyamide and polyester are expensive, and thus polypuropyrene or polystyrene is used. In particular, it is preferable to use a mixed resin of 40 to 70 wt% of polypurpyrene and 30 to 60 wt% of polystyrene in order to compensate for the weak physical properties of each of polypropylene and polystyrene.

Supported by a thick portion in the center of the modified shape of the band-shaped prattyan artificial turf as shown in Figure 2, that is, the length of the artificial turf as shown in Figure 2 in the extruder maintained in the range of 150 ~ 250 ℃ with the thermoplastic resin as described above The auxiliary support (2) is formed in parallel with the support and the artificial turf formed by the thin portion (3) at the edge of the artificial turf is deposited by immersing it in hot water maintained at a temperature of 50 to 70 ° C at the same time as extrusion. It is a method for producing artificial turf, characterized in that to form a wave (wave) on the grass edge.

Although the above-mentioned thermoplastic resin may be used as a raw material of artificial grass in the above manufacturing method, it is advantageous to use polypuropyrene and polystyrene, which are lightweight and inexpensive, but polypuroprene is excellent in tensile strength and lightweight, but has extremely cold resistance. It is fragile and under 0 ~ -5 ℃, the impact resistance including tensile strength drops sharply and is easily broken. Polystyrene is excellent in flexibility, elasticity and impact resistance, but it is weak in heat resistance and softens at 50 ~ 60 ℃ for low density polystyrene. As the tensile strength falls in summer, it is possible to compensate for the weakness of each resin property by using a mixture of PP and PE.

In addition, since the styrene / butene copolymer is used as a physical property improving agent which can improve the compatibility of each resin and improve the tensile strength, the physical properties can be further improved.

Here, the mixing ratio of PP and PE is 40 to 70wt% of PP and 30 to 60wt% of PE, and 2 to 5wt% of a physical modifier is added to the mixed resin to improve flexibility and tensile strength.

In addition, looking at the process of forming the artificial turf of the present invention, the extruder maintained at least 150 ℃ or more is maintained at 40 ~ 70 ℃ extruded through each mold as a resin in the extruder and the thermoplastic resin softened and melted As it is put into the hot water tank, the first part of the solidification proceeds to increase the viscosity and at the same time, the shrinkage occurs, but due to the difference in thickness of the thick part and the thin part of the edge of the artificial turf, the shrinkage rate is increased and When the primary wave is generated and stretched, it is completely cooled and solidified in the stretched state. As a result of shrinkage due to cooling, the synthetic resin has elasticity and thus has a circular restorability, which is also reduced in the thick part and decreases in the thin part. The rate is less than the thickness.

As a result of this phenomenon, a waveform is generated in the thin portion that is the edge.

In addition, when the temperature of the hot water is further increased, the viscosity of the artificial turf is lowered, so that the artificial turf is easily stretched at the time of stretching, so that the width is narrower than the standard, and it is easy to break. As cracks or digs occur in the width direction and thickness is not uniform, it is easy to break after construction with artificial turf of finished product, so the temperature range is 40 ~ 70 ℃, and 50 ~ 60 ℃ is most suitable. It can be said.

The artificial turf produced by the above method has a thick support in the center along the longitudinal direction of the artificial turf as shown in FIG. 3, and an auxiliary support 2 is formed to be adjacent to the support and parallel to the support. The flesh portion 3 may be referred to as an artificial turf having a waveform 4 formed thereon.

Since the artificial turf is not flat like a conventional band-like pratyan artificial turf, the amount of reflection caused by sunlight or light in the stadium can be greatly reduced, which does not interfere with the players' game, and reduces fatigue. And auxiliary support is formed to reduce the artificial turf by reinforcing the support force, even when using the same amount of conventional band-type flat yarn artificial turf when planting on artificial turf mat, it looks dense and bulky due to the volume It can be called artificial turf which gives a feeling of fullness and gives texture of natural grass.

In order to find out the physical properties of the artificial turf according to the present invention was prepared artificial turf as an example.

Example (1)

To the mixed resin in which 60 wt% of isotactic PP and 40 wt% of polystyrene were added, 3 wt% of styrene / butene copolymer was added as a physical modifier to prepare 1600 denier artificial turf by the method for preparing artificial turf of the present invention.

Example (2)

An artificial turf having the same thickness as that of Example (1) was manufactured by the method of manufacturing artificial turf of the present invention using a mixed resin obtained by mixing isotactic PP 60wt% and polystyrene 40wt%.

Comparative Example (3)

As a result of comparing the tensile strength of the artificial turf of Example (1) and the artificial turf of Example (2), the experimental results as shown in Table (1) were obtained.

Property Table Item ＼ Classification Example (1) Artificial Turf Example (2) Artificial Turf The tensile strength 16.4kgF / 1800D 13.6kgF / 1800D importance 9.21 9.2 Heat distortion temperature 100 ~ 110 ℃ 100 ~ 110 ℃ Cold resistance Vulnerable at -20 ~ 25 ℃. Vulnerable at -20 ~ 25 ℃.

As shown in Table (1), the artificial turf added with the physical modifier increased the tensile strength compared to the artificial turf without adding the specific modifier, and the specific gravity is the intermediate value of the PP and PE used, and the thermal deformation of the artificial turf made of the mixed resin. The temperature is higher than the range of 50 ~ 60 ° in the case of PE, so it is more heat resistant than the artificial turf of PE and is lower than the heat deformation temperature of 140 ~ 150 ° C. It is vulnerable and breaks well, but weakens at -20 ~ 25 ° of artificial turf of mixed resin, so the cold resistance is greatly improved compared to artificial turf of PP. Therefore, artificial turf added with mixed resin or physical property additive is almost all-weather artificial turf that can maintain the physical properties of artificial turf because there is almost no change in physical properties during the heat wave during summer or during the cold weather in winter.

1 ........ Support 2 ........ Auxiliary Support
3 ........ Thin section 4 ........ waveform

Claims (3)

The thermoplastic resin is extruded through an extruder maintained at 150 to 250 ° C., and a support 1 having a thick portion is formed at the center in front and rear along the longitudinal direction of the artificial turf, and is parallel to the support 1 in front and rear. Auxiliary support (2) is formed on both sides and the artificial turf edge is extruded the artificial turf with thin parts (3) into the mold and deposited on the hot water maintained at 50 ~ 70 ℃ and solidified by cooling. Method of producing artificial turf, characterized in that to form a wave at the edge of the artificial turf while drawing to solidify completely cooling.
The method of claim 1, wherein the thermoplastic resin is 40 to 70wt% polypropylene resin, polystyrene 30 to 60wt% mixed resin further comprises a method for producing artificial turf.
The method of claim 2, wherein the modified mixed resin is added to the mixed resin 2 to 5wt% of the ethylene / butene copolymer as a physical modifier.

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