Artificial turf system that can be used all-season

Abstract

The present invention relates to an artificial turf system that can be used in four seasons by forming a pile layer using pile yarn that has excellent tensile strength, elongation, wear resistance, resilience, shock absorption, temperature reduction, coefficient of friction, vertical deformation, and rotational resistance even under extreme climatic conditions such as severe cold and severe heat. The present invention is characterized by comprising: a pile layer made of pile yarns manufactured by melting a pile yarn mixture, comprising LLDPE (Linear Low-Density Polyethylene), HDPE (High-Density Polyethylene), SEBS (Styrene-Ethylene-Butylene-Styrene), POE (Polyolefin), and titanium dioxide (TiO2) mixed in a predetermined ratio, at a predetermined temperature and then extruding it through a nozzle having a polygonal cross-section; a filler layer made of filler materials laid on the pile layer; a shock-absorbing pad installed below the pile layer to absorb shock; and a drainage plate coupled below the shock-absorbing pad.

Description

Technology Field

[0001] The present invention relates to an artificial turf system that can be used in four seasons by forming a pile layer using pile yarn that has excellent tensile strength, elongation, wear resistance, resilience, shock absorption, temperature reduction, coefficient of friction, vertical deformation, and rotational resistance even under extreme climatic conditions such as severe cold and severe heat. Background Technology

[0003] Generally, to satisfy the FIFA Quality Pro standards corresponding to international standards, tensile strength, elongation, abrasion resistance, resilience, shock absorption, temperature reduction, coefficient of friction, vertical deformation, and rotational resistance must all be excellent. However, existing artificial turf is sensitive to external temperature changes, leading to performance degradation. Consequently, it is difficult to meet the FIFA Quality Pro standards due to seasonal performance declines.

[0004] In particular, during the cold season, the pile fibers stiffened, causing not only a decrease in tensile strength and resilience but also easy cracking, which mainly resulted in durability issues. During the hot season, excessive heat accumulation led to a rise in the surface temperature and increased friction coefficient of the artificial turf, causing a significant decrease in user safety and comfort. Furthermore, if excessive infill material was laid to resolve these issues, the construction and maintenance costs of the artificial turf system became excessively high, and problems with reduced drainage and shock absorption resulted in failure to meet FIFA Quality Pro standards.

[0005] Various inventions have been disclosed as prior art to solve these problems, but they have limitations. Specifically, to explain,

[0006] Korean Patent No. 10-2233661 is a patent invention previously filed and registered by the applicant of the present invention, which proposed an integrated shock-absorbing pad structure, but the cross-section of the pile yarn was limited to a circular or elliptical shape, resulting in a negligible effect in mitigating heat accumulation and a drainage rate of less than 300 ml per minute, which did not satisfy international standards. Korean Patent No. 10-1966411 is a patent invention previously filed and registered by the applicant of the present invention, which proposed a new filler composition, but had a problem in that the particle shape was uniform, resulting in a friction coefficient of 0.9 or higher and limited shock dispersion ability.

[0007] In addition, Korean registered patent No. 10-0881167 has a tensile strength retention rate of only 70% or less due to the lack of a multi-stage stretching process, and Japanese published patent No. 2018-178499 has limitations as it cannot be used in cold weather because low-temperature performance is not properly secured and the drainage rate per minute is low because it is not equipped with a drainage plate with a perforated structure.

[0008] Therefore, in order to solve the aforementioned problems and satisfy the international standard FIFA Quality Pro, the need has arisen for an artificial turf system that can be used in all four seasons by forming a pile layer using pile yarns that have excellent tensile strength, elongation, wear resistance, resilience, shock absorption, temperature reduction, coefficient of friction, vertical deformation, and rotational resistance even under extreme weather conditions such as cold and hot weather. Prior art literature

[0010] Korean Registered Patent No. 10-2233661 (March 31, 2021) Korean Registered Patent No. 10-1966411 (April 5, 2019) Korean Registered Patent No. 10-0881167 (February 2, 2009) Japanese Published Patent No. 2018-178499 (November 15, 2018) The problem to be solved

[0011] The present invention aims to solve the above-mentioned problems, and its purpose is to provide an artificial turf system that can be used in all four seasons by forming a pile layer using pile yarn that has excellent tensile strength, elongation, wear resistance, resilience, shock absorption, temperature reduction, coefficient of friction, vertical deformation, and rotational resistance even under extreme climatic conditions such as severe cold and severe heat. means of solving the problem

[0013] To achieve the above objective, the four-season artificial turf system of the present invention comprises a pile yarn mixture formed by polymerizing 60~64 wt% of LLDPE (Linear Low-Density Polyethylene)-C8 (formed by polymerizing ethylene with 8 carbon atoms α-olefin), 10~14 wt% of HDPE (High-Density Polyethylene), 8~12 wt% of SEBS (Styrene-Ethylene-Butylene-Styrene), 8~12 wt% of POE (Polyolefin), 1.5~2.5 wt% of titanium dioxide (TiO2), 0.5~1.0 wt% of a light stabilizer, 1.0~3.0 wt% of a color pigment, 0.3~0.5 wt% of PPA (Polymer Processing Additive), 0.5~1.0 wt% of PE wax, and 0.3~0.5 wt% of an infrared reflective pigment, which is then melted at a predetermined temperature and formed a polygonal It is characterized by comprising: a pile layer made of pile yarn manufactured by extrusion with a nozzle having a cross-section; a filler layer made of filler material laid on the pile layer; a shock-absorbing pad installed below the pile layer to absorb shock; and a drainage plate coupled below the shock-absorbing pad.

[0014] delete

[0015] delete

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[0017] In addition, the above-mentioned pile is characterized by having a diamond-shaped cross-section.

[0018] In addition, the above pile is characterized by having a width of 0.8 to 1.5 mm.

[0019] In addition, the pile yarn is characterized by being multi-stage stretched by extruding a pile yarn mixture using a nozzle having a polygonal cross-section, then stretching it 3 to 3.5 times, stretching it 1.2 to 2.2 times, and shrinking it 0.85 to 0.9 times.

[0020] In addition, the above filler is characterized by being formed into a predetermined shape after melting a filler mixture in which SEBS (Styrene-Ethylene-Butylene-Styrene), POE (Polyolefin), calcium carbonate, paraffin oil, and titanium dioxide (TiO2) are mixed in a predetermined ratio.

[0021] In addition, the above filler is characterized by being prepared as a filler mixture comprising 10-20% by weight of SEBS, 10-20% by weight of POE, 40-60% by weight of calcium carbonate, 10-20% by weight of paraffin oil, and 1.5-2.5% by weight of titanium dioxide (TiO2).

[0022] In addition, the above filler mixture is characterized by further mixing 0.5 to 1 weight% of a light stabilizer, 1 to 2 weight% of a color pigment, 0.3 to 0.5 weight% of PPA, and 0.3 to 0.5 weight% of an infrared reflective pigment.

[0023] In addition, the filler is characterized by being molded into one or more selected shapes among spherical, cylindrical, or polyhedral particles.

[0024] In addition, the above-mentioned filler layer is characterized by being formed by evenly mixing 30-50% by weight of spherical filler, 20-40% by weight of cylindrical filler, and 20-40% by weight of polyhedral filler and then laying it down.

[0025] In addition, the shock-absorbing pad is manufactured by foaming a PE (Polyethylene)-based material by a factor of 25 to 35, and is characterized by having a Shore C of 30 to 40.

[0026] In addition, the drain plate is characterized by having multiple drain holes with a diameter of 6 to 10 mm perforated at predetermined intervals.

[0027] In addition, the artificial turf system is characterized by having a rolling resistance of 28 to 42 N·m and a vertical deformation of 5 to 7 mm, which meets the FIFA Quality Pro standards. Effects of the invention

[0029] According to the present invention, by forming a pile layer using pile yarn that has excellent tensile strength, elongation, wear resistance, resilience, shock absorption, temperature reduction, coefficient of friction, vertical deformation, and rotational resistance even under extreme climatic conditions such as severe cold and heat, the artificial turf system can be used not only during severe cold and heat but also throughout all four seasons. Brief explanation of the drawing

[0031] FIG. 1 is a conceptual diagram of an artificial turf system according to one embodiment of the present invention. FIG. 2 is a flowchart of the pile yarn manufacturing process of an embodiment of the present invention. FIG. 3 is an exemplary cross-sectional view of a pile yarn according to an embodiment of the present invention. FIG. 4 is an exemplary diagram of a drainage plate according to an embodiment of the present invention. FIG. 5 is an exemplary diagram of the shape of a filler according to an embodiment of the present invention. Specific details for implementing the invention

[0032] A four-season artificial turf system according to a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0033] The terms used herein are not intended to limit the technology described in this document to specific embodiments, and it is preferable to understand that they include various modifications, equivalents, and substitutions of said embodiments.

[0034] Terms such as "first" or "second" used in describing the present invention are intended to distinguish one component from another component of a similar form, and the use of such terms does not limit the scope of the rights.

[0035] When describing the present invention, unless otherwise indicated, it is preferable to understand that the expression 'A or B' may be used selectively as either A or B, or as A and B together.

[0036] The drawings used to describe the invention may contain exaggerated or omitted parts to facilitate the easy identification of the features of the invention, and this does not limit specific embodiments of the invention.

[0037] In addition, when a specific direction (up, down, left, right, vertical, horizontal, inward, outward, etc.) is specified in the description of the present invention, it should be understood that such description is merely for the purpose of explaining specific examples to facilitate explanation and aid understanding, and does not limit or restrict a specific configuration or specific embodiment.

[0039] As illustrated in FIG. 1, the artificial turf system of the present invention, which is usable in all four seasons, comprises a pile layer made of pile yarns manufactured by melting a pile yarn mixture of LLDPE (Linear Low-Density Polyethylene), HDPE (High-Density Polyethylene), SEBS (Styrene-Ethylene-Butylene-Styrene), POE (Polyolefin), and titanium dioxide (TiO2) in a predetermined ratio at a predetermined temperature and then extruding it through a nozzle having a polygonal cross-section, a filler layer made of filler materials laid on the pile layer, a shock-absorbing pad installed below the pile layer to absorb shock, and a drainage plate coupled below the shock-absorbing pad.

[0040] Here, the pile layer comprises a base paper on which pile yarns are woven, and it is preferable to understand it as a concept of an artificial turf mat.

[0041] In other words, the above artificial turf system should be understood as being constructed by sequentially installing a drainage plate, a shock-absorbing pad, a pile layer, and a filler layer.

[0042] In addition, this artificial turf system can also be configured by first laying silica sand on top of the pile layer and then laying the filler on top of the silica sand, as needed.

[0043] To explain in detail the construction order of each component of the above artificial turf system, first, the drainage plate is used with multiple drainage holes with a diameter of 6 to 10 mm perforated at a predetermined interval, and it is preferable to set the interval to 50 to 70 mm so that rainwater and the like can be drained smoothly. If necessary, the upper part of the drainage holes may be processed with a counter-sink at a predetermined angle so that moisture flowing into the drainage plate can be guided to the ground through the drainage holes.

[0044] At this time, it is preferable to use a PE (Polyethylene)-based material for the drainage plate to ensure shock absorption, and if necessary, a foamed pad made by foaming the material, such as the shock-absorbing pad described later, may also be used.

[0045] In addition, the shock-absorbing pad is a pad installed below the pile layer to absorb and disperse shocks generated during the use of the artificial turf system, and it is preferably manufactured by foaming a PE (Polyethylene)-based material by a factor of 25 to 35, with a Shore C of 30 to 40.

[0046] The above pile layer is composed of a base paper on which the pile yarn is woven, which fixes the woven pile yarn and embodies the characteristics of natural grass.

[0047] The pile yarn woven into this pile layer is manufactured by melting a pile yarn mixture, comprising LLDPE (Linear Low-Density Polyethylene), HDPE (High-Density Polyethylene), SEBS (Styrene-Ethylene-Butylene-Styrene), POE (Polyolefin), and titanium dioxide (TiO2) in predetermined proportions, at a predetermined temperature and then extruding it through a nozzle having a polygonal cross-section, as described in detail below.

[0048] The above pile yarn is manufactured from a pile yarn mixture comprising 60-64% by weight of LLDPE, 10-14% by weight of HDPE, 8-12% by weight of SEBS, 8-12% by weight of POE, and 1.5-2.5% by weight of titanium dioxide (TiO2), but it should be understood that it is not necessarily limited to this, and that additional additives to improve performance may be mixed as needed.

[0049] Although the above LLDPE can prevent skin damage caused by friction and add soft properties to artificial turf, using it alone results in low rigidity, causing it to collapse easily under external pressure and become susceptible to wear; therefore, it is used in combination with HDPE, which will be described later.

[0050] Here, when mixing the pile yarn mixture, if LLDPE is mixed at less than 60% by weight, the soft texture and low friction coefficient provided by LLDPE may not be properly achieved, and when LLDPE is added at more than 64% by weight when mixing the pile yarn mixture, there is a problem of reduced stiffness and wear resistance as the relative amount of HDPE mixed decreases. Therefore, it is preferable that the amount of LLDPE added when mixing the pile yarn mixture be 60~64% by weight.

[0051] At this time, the LLDPE may be LLDPE-C8 formed by polymerizing ethylene with an α-olefin having 8 carbon atoms, and by using such LLDPE-C8 in the preparation of the pile yarn mixture, it is possible to increase the tensile strength, elasticity, chemical resistance, and flexibility at low temperatures of the pile yarn when stretching the pile yarn, as well as increase stability at high temperatures, thereby forming a pile yarn that can be used stably even in four-season climate changes.

[0052] In addition, the above HDPE is a component added to prevent problems of stiffness and wear resistance that may occur when LLDPE is used alone. When HDPE is added in an amount of less than 10% by weight when mixing the pile yarn mixture, the effect of increasing stiffness and wear resistance is not properly manifested, so there is a problem that it may easily collapse or break due to external pressure. When it is added in an amount exceeding 14% by weight, the wear coefficient of the pile yarn may increase more than necessary as the relative mixing amount of LLDPE decreases. Therefore, it is preferable that the amount of HDPE added when mixing the pile yarn mixture be 10~14% by weight.

[0053] Furthermore, using LLDPE and HDPE in the manufacture of pile yarn allows for the recycling of residues after production, thereby having the effect of reducing the amount of waste generated.

[0054] In addition, the above SEBS is a component added to impart elasticity and resilience to the pile yarn. When the SEBS content is added at less than 8% by weight during the mixing of the pile yarn mixture, there is a problem in that elasticity and resilience are not properly imparted to the pile yarn, so the effect is not manifested. When the SEBS content is added at more than 12% by weight during the mixing of the pile yarn mixture, the LLDPE and HDPE content decreases relatively, which may result in a problem in that the rigidity and uprightness of the pile yarn are not secured. Therefore, it is preferable that the amount of SEBS added during the mixing of the pile yarn mixture be 8 to 12% by weight.

[0055] In addition, the above POE is a component added to provide shock absorption and flexibility to the pile yarn in a low-temperature environment. When the POE content is added at less than 8% by weight during the mixing of the pile yarn mixture, there is a problem that shock absorption is not properly exhibited in a low-temperature environment, and when the POE content is added at more than 12% by weight during the mixing of the pile yarn mixture, there is a problem that heat resistance is lowered. Therefore, it is preferable that the amount of POE added during the mixing of the pile yarn mixture be 8 to 12% by weight.

[0056] In addition, the titanium dioxide (TiO2) is added to provide a surface temperature reduction function to the pile yarn. When the titanium dioxide (TiO2) content is less than 1.5 weight% when mixing the pile yarn mixture, there may be a problem in that the temperature reduction function due to infrared reflection is not properly implemented due to the insufficient content, even if the titanium dioxide (TiO2) is evenly dispersed. When the titanium dioxide (TiO2) content is added in excess of 2.5 weight% when mixing the pile yarn mixture, there may be a problem in that the titanium dioxide (TiO2) is powdered and detached, or the physical properties of the pile yarn itself are degraded.

[0057] In addition, the pile yarn mixture may further include 0.5 to 1.0 wt% of a light stabilizer, 1.0 to 3.0 wt% of a color pigment, 0.3 to 0.5 wt% of PPA (Polymer Processing Additive), 0.5 to 1.0 wt% of PE wax, and 0.3 to 0.5 wt% of an infrared reflective pigment, as needed, thereby improving the performance of the pile yarn manufactured by extruding and molding the pile yarn mixture.

[0058] Specifically, the light stabilizer is added to prevent the pile yarn from discoloring or deteriorating in performance due to ultraviolet rays, thereby increasing the durability of the pile yarn and preventing damage to the pile yarn caused by direct sunlight in environments such as hot weather.

[0059] In addition, the above-mentioned color pigment is configured to determine the color of the pile yarn to be extruded through the pile yarn mixture, and preferably, a light green or green pigment is used to prevent the phenomenon of heat easily accumulating in the pile yarn manufactured using the pile yarn mixture.

[0060] In addition, the above PPA is a processing additive added to enhance the processability of LLDPE and HDPE, etc., mixed in the above pile yarn mixture. It can increase production efficiency by improving material processability and is added to improve quality by preventing damage during the extrusion process through lubrication.

[0061] In addition, the above PE wax may be added to control the flow when the pile yarn mixture is melted and extruded, so that the pile yarn mixture does not adhere to the extruder or its fluidity decreases, thereby blocking the outlet and preventing extrusion, in order to prevent problems such as equipment damage.

[0062] In addition, the infrared reflective pigment is a pigment added to suppress the temperature rise of a field where the artificial turf system of the present invention is installed. By imparting the function of causing the pile fibers to reflect infrared rays from sunlight, it suppresses the rise in the surface temperature of the artificial turf and can reduce the risk of burns to users.

[0063] The above pile can be made to have a diamond (◇) shaped cross-section, and by forming one of the diamond-shaped interior angles based on the cross-section of the pile at 80 to 100°, it is possible to reflect light according to the angle of incidence of light and easily dissipate accumulated heat, thereby mitigating the phenomenon of heat accumulation in the pile during hot weather.

[0064] In addition, the above pile may have a width of 0.8 to 1.5 mm.

[0065] The file layer using the file company as described above is formed in the following order.

[0066] First, a pile yarn mixture is prepared by mixing 60~64 wt% LLDPE, 10~14 wt% HDPE, 8~12 wt% SEBS, 8~12 wt% POE, and 1.5~2.5 wt% titanium dioxide (TiO2).

[0067] At this time, if necessary, the function of the pile yarn may be improved by further mixing 0.5~1.0 wt% of a light stabilizer, 1.0~3.0 wt% of a color pigment, 0.3~0.5 wt% of PPA (Polymer Processing Additive), 0.5~1.0 wt% of PE wax, and 0.3~0.5 wt% of an infrared reflective pigment.

[0068] The pile yarn mixture produced through the above process is extruded using a nozzle having a polygonal cross-section, specifically, the nozzle may have a diamond-shaped cross-section.

[0069] Subsequently, the extruded pile yarn mixture is first stretched 3 to 3.5 times, secondarily stretched 1.2 to 2.2 times, and then shrunk 0.85 to 0.9 times to form a pile yarn through a multi-stage stretching process, so that sufficient tensile strength can be achieved even in low-temperature environments such as severe cold.

[0070] The pile yarn formed through a multi-stage stretching process is tufted onto a foam sheet, and a back coating is applied to the back of the foam sheet where the pile yarn is tufted using latex or heat fusion to firmly secure the pile yarn to the foam sheet.

[0072] In addition, the above-mentioned filler layer is composed of a filler laid on top of the pile layer, wherein the filler forming the said filler layer is formed by melting a filler mixture comprising SEBS (Styrene-Ethylene-Butylene-Styrene), POE (Polyolefin), calcium carbonate, paraffin oil, and titanium dioxide (TiO2) mixed in a predetermined ratio, and then molding it into a predetermined shape.

[0073] Specifically, the above filler is prepared as a filler mixture comprising 10-20% by weight of SEBS, 10-20% by weight of POE, 40-60% by weight of calcium carbonate, 10-20% by weight of paraffin oil, and 1.5-2.5% by weight of titanium dioxide (TiO2).

[0074] The above SEBS is a component that imparts elasticity, resilience, and durability to the filler. When the SEBS content is added at less than 10% by weight during the mixing of the filler mixture, the elasticity and resilience are not properly imparted to the filler, resulting in a problem where the effect is not manifested. When the SEBS content is added at more than 20% by weight during the mixing of the filler mixture, the production cost of the filler may become excessively high. Therefore, it is preferable that the amount of SEBS added during the mixing of the filler mixture be 10 to 20% by weight.

[0075] In addition, the above POE is a component added to provide shock absorption and flexibility to the filler in a low-temperature environment. When the content of POE is less than 10% by weight when mixing the filler mixture, there is a problem that shock absorption is not properly exhibited in a low-temperature environment, and when the content of POE is more than 20% by weight when mixing the filler mixture, there is a problem that heat resistance is lowered. Therefore, it is preferable that the amount of POE added when mixing the filler mixture be 10~20% by weight.

[0076] In addition, the calcium carbonate is added for the purpose of adding weight to the filler to prevent loss of the filler and increasing durability. When the calcium carbonate content is less than 40% by weight when mixing the filler mixture, there is a problem of increased loss or reduced durability due to insufficient weight of the filler. When the calcium carbonate content is added exceeding 60% by weight when mixing the filler mixture, there is a problem of reduced elasticity and resilience of the filler as the content of SEBS and POE decreases relatively. Therefore, it is preferable that the amount of calcium carbonate added when mixing the filler mixture be 40% to 60% by weight.

[0077] In addition, the paraffin oil is added to increase the processability and mixability of the filler mixture. When the paraffin oil content is less than 10% by weight when mixing the filler mixture, the filler mixture is not properly mixed with the filler, resulting in a problem where the composition within the mixture is not dispersed. When the paraffin oil content exceeds 20% by weight when mixing the filler mixture, the fluidity of the filler mixture increases excessively, and there may be limitations on molding the filler due to the problem of foaming during the underwater cutting process for molding. Therefore, it is preferable that the amount of paraffin oil added when mixing the filler mixture be 10 to 20% by weight.

[0078] In addition, the titanium dioxide (TiO2) is added to provide a surface temperature reduction function to the filler. When the titanium dioxide (TiO2) content is less than 1.5 weight% when mixing the filler mixture, there may be a problem in that the temperature reduction function due to infrared reflection is not properly implemented due to the insufficient content, even if the titanium dioxide (TiO2) is evenly dispersed. When the titanium dioxide (TiO2) content is added in excess of 2.5 weight% when mixing the filler mixture, there may be a problem in that the titanium dioxide (TiO2) is powdered and detached, or the physical properties of the filler itself are degraded.

[0079] In addition, the performance of the infill material used in the artificial turf system of the present invention may be enhanced by further mixing 0.5 to 1 weight% of a light stabilizer, 1 to 2 weight% of a color pigment, 0.3 to 0.5 weight% of PPA, and 0.3 to 0.5 weight% of an infrared reflective pigment into the above-mentioned infill mixture as needed.

[0080] Specifically, the light stabilizer is added to prevent the filler from discoloring or deteriorating in performance due to ultraviolet rays, thereby increasing the lifespan of the filler and preventing damage to the filler caused by direct sunlight in environments such as hot weather.

[0081] In addition, the color pigment is configured to determine the color of the filler to be manufactured using the filler mixture, and preferably, a light green or green pigment may be used to prevent the phenomenon of heat easily accumulating in the filler manufactured using the filler mixture.

[0082] In addition, the above PPA is a processing additive added to enhance the processability of SEBS and POE mixed in the above filler mixture. It can increase production efficiency by improving material processability and is added to improve quality by preventing damage during processes such as underwater cutting for molding through its lubricating action.

[0083] In addition, the infrared reflective pigment is a pigment added to suppress the temperature rise of a field where the artificial turf system of the present invention is installed. By imparting the function of causing the infill material to reflect infrared rays from sunlight, it suppresses the rise in the surface temperature of the artificial turf and can reduce the risk of burns to users.

[0085] As illustrated in FIG. 5, the filler may be formed into one or more selected shapes among spherical, cylindrical, or polyhedral particles.

[0086] In this case, the spherical filler is not necessarily a perfect sphere symmetrical about three mutually perpendicular axes of equal length, but may be in the form of an ellipsoid symmetrical about at least one axis about three mutually perpendicular axes of different lengths, and the cylindrical filler is not in a form that is completely filled internally, but may be in the form of a pipe with a hole perforated about the central axis.

[0087] In addition, the above-mentioned filler layer may be formed by evenly mixing 30 to 50 weight percent of spherical filler, 20 to 40 weight percent of cylindrical filler, and 20 to 40 weight percent of polyhedral filler and then laying it down.

[0088] To explain this in detail, when spherical, cylindrical, and polyhedral fillers are mixed and laid as described above, shock absorption and shock dispersion performance can be improved, and the coefficient of friction caused by the fillers can be reduced in extreme environments such as extreme cold or extreme heat, thereby satisfying international standards such as FIFA Quality Pro.

[0090] In order to verify the performance of an artificial turf system with the above-described configuration, the present invention conducted a test according to Experimental Example 1 on an artificial turf system of Example 1 using pile yarn and filler manufactured according to the manufacturing example below, under the same conditions as the artificial turf system of Comparative Example 1, and a detailed explanation thereof is provided below in Experimental Example 1.

[0091] At this time, for four-season use, the artificial turf system of the present invention was tested according to the standards of FIFA Quality Pro on specimens of Example 1 and Comparative Example 1 in environments of -40±2℃ for extreme cold, 55±2℃ for extreme heat, and 20±2℃ for ambient temperature.

[0093] <Preparation Example 1>

[0094] A bubble sheet was prepared by tufting pile yarns manufactured according to the order of (1) to (3) below.

[0095] (1) A pile yarn mixture was prepared by mixing 62 wt% LLDPE, 12 wt% HDPE, 10 wt% SEBS, 10 wt% POE, 2 wt% titanium dioxide (TiO2), 0.5 wt% light stabilizer, 2 wt% color pigment, 0.4 wt% PPA, 0.6 wt% PE wax, and 0.5 wt% infrared reflective pigment.

[0096] ⑵ The pile yarn mixture produced through the process of ⑴ above was melted under a temperature condition of 200℃ and then extruded with an extruder to produce pile yarn.

[0097] (3) A pile yarn was manufactured by performing a multi-stage stretching process in which the pile yarn extruded in the process of (2) above was stretched 3.2 times in the first stage, stretched 1.7 times in the second stage, and then shrunk by 0.85 times.

[0099] <Preparation Example 2>

[0100] Filler materials were prepared according to the order of (1) to (3) below.

[0101] (1) A filler mixture was prepared by mixing 15 wt% SEBS, 15 wt% POE, 50 wt% calcium carbonate, 15 wt% paraffin oil, 1.5 wt% titanium dioxide, 1 wt% light stabilizer, 1.5 wt% color pigment, 0.5 wt% PPA, and 0.5 wt% infrared reflective pigment.

[0102] ⑵ The filler mixture prepared in ⑴ above was melted under a temperature condition of 200℃ and then extruded with an extruder to produce a filler.

[0103] (3) The above filler material was underwater cut to form spherical, cylindrical, and polyhedral shapes, and the filler material was prepared by mixing the spherical filler material in a ratio of 40% by weight, the cylindrical filler material in a ratio of 30% by weight, and the polyhedral filler material in a ratio of 30% by weight.

[0105] <Example 1>

[0106] An artificial turf system was prepared by installing a shock-absorbing pad made of PE expanded 25 times on top of a drainage plate with drain holes of 6 mm diameter perforated at 50 mm intervals, placing a sheet of fabric woven with pile yarn of Example 1 on top of the shock-absorbing pad to form a pile layer, and evenly laying the filler of Example 2 on the pile layer.

[0108] <Comparative Example 1>

[0109] We prepared an artificial turf system consisting of commercially available shock-absorbing pads, drainage boards, woven fiber sheets, and fillers.

[0111] <Experimental Example 1>

[0112] 1-1. Weathering Resistance Comparative Test

[0113] After taking specimens from the artificial turf systems of Example 1 and Comparative Example 1, each specimen was exposed to an environment of -40±2℃ during the cold season, 55±2℃ during the hot season, and 20±2℃ during the room temperature. The tensile strength retention rate, shock absorption, friction coefficient, rolling resistance, and drainage amount were measured according to the FIFA Quality Pro standards, and the measured values ​​were recorded in Table 1 below.

[0114] division Tensile strength retention rate[%] Shock absorption [%] coefficient of friction Rotational resistance [N·m] Discharge volume [㎖ / min] Comparative Example 1 -40℃ 67 50 0.81 48 490 20℃ 94 68 0.62 32 600 55℃ 72 49 0.83 49 450 Example 1 -40℃ 86 63 0.69 38 550 20℃ 95 68 0.65 36 600 55℃ 90 62 0.78 41 520

[0115] As a result, as shown in Table 1, in the case of Comparative Example 1, the tensile strength, shock absorption, coefficient of friction, rolling resistance, and drainage amount were all found to be similar to those of Example 1 at room temperature; however, in extreme cold and extreme hot environments, the tensile strength retention rate and shock absorption decreased rapidly, while the coefficient of friction and rolling resistance increased.

[0116] On the other hand, in the case of Example 1, which has the configuration of an artificial turf system capable of four-season use according to the present invention, it was confirmed that the tensile strength retention rate and shock absorption rate maintained performance with a small decrease from the values ​​measured at room temperature even in extreme cold and hot environments, and similarly, the friction coefficient and rolling resistance also maintained performance as originally intended even in extreme environments with a small increase from the values ​​measured at room temperature.

[0117] In addition, Example 1, which has the configuration of an artificial turf system capable of four-season use according to the present invention, is an excellent artificial turf system that satisfies international standards, as it was confirmed that the values ​​measured in extreme environments (extreme cold and extreme heat) and ambient temperature environments all satisfy the FIFA Quality Pro standards.

[0119] The above description is based on the drawings of the present invention, but is not limited to the parts described based on the drawings. Various modifications can be made within the scope of the gist of the present invention in the technical field to which the present invention belongs, without departing from the parts described based on the drawings.

Claims

Claim 1 A pile layer comprising pile yarns manufactured by melting a pile yarn mixture, formed by polymerizing 60~64 wt% of LLDPE (Linear Low-Density Polyethylene)-C8 (formed by polymerizing α-olefin having 8 carbon atoms and ethylene), 10~14 wt% of HDPE (High-Density Polyethylene), 8~12 wt% of SEBS (Styrene-Ethylene-Butylene-Styrene), 8~12 wt% of POE (Polyolefin), 1.5~2.5 wt% of titanium dioxide (TiO2), 0.5~1.0 wt% of a light stabilizer, 1.0~3.0 wt% of a color pigment, 0.3~0.5 wt% of PPA (Polymer Processing Additive), 0.5~1.0 wt% of PE wax, and 0.3~0.5 wt% of an infrared reflective pigment, at a predetermined temperature and then extruding it through a nozzle having a polygonal cross-section; the pile layer An artificial turf system capable of four-season use, characterized by comprising: a filler layer made of a laid filler; a shock-absorbing pad installed below the pile layer to absorb shock; and a drainage plate coupled below the shock-absorbing pad. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 An artificial turf system capable of four seasons, characterized in that, in claim 1, the pile has a diamond-shaped cross-section. Claim 6 In claim 5, the above pile yarn is characterized by having a width of 0.8 to 1.5 mm, making it an artificial turf system usable in all four seasons. Claim 7 An artificial turf system capable of four seasons, characterized in that, in claim 1, the pile yarn is multi-stage stretched by extruding a pile yarn mixture using a nozzle having a polygonal cross-section, then stretching it 3 to 3.5 times, stretching it 1.2 to 2.2 times, and then shrinking it 0.85 to 0.9 times. Claim 8 The artificial turf system capable of four seasons, wherein the filler is formed by melting a filler mixture comprising SEBS (Styrene-Ethylene-Butylene-Styrene), POE (Polyolefin), calcium carbonate, paraffin oil, and titanium dioxide (TiO2) mixed in a predetermined ratio, and then molding it into a predetermined shape. Claim 9 An artificial turf system capable of four-season use according to claim 8, wherein the filler is manufactured from a filler mixture comprising 10-20% by weight of SEBS, 10-20% by weight of POE, 40-60% by weight of calcium carbonate, 10-20% by weight of paraffin oil, and 1.5-2.5% by weight of titanium dioxide (TiO2). Claim 10 An artificial turf system usable in all four seasons, characterized in that, in claim 9, the filler mixture further comprises 0.5 to 1 weight% of a light stabilizer, 1 to 2 weight% of a color pigment, 0.3 to 0.5 weight% of PPA, and 0.3 to 0.5 weight% of an infrared reflective pigment. Claim 11 An artificial turf system usable in all four seasons, characterized in that, in claim 8, the filler is molded into one or more shapes selected from spherical, cylindrical, or polyhedral particles. Claim 12 An artificial turf system usable in all four seasons, characterized in that, in claim 11, the filler layer is formed by evenly mixing and laying 30 to 50 weight percent of spherical filler, 20 to 40 weight percent of cylindrical filler, and 20 to 40 weight percent of polyhedral filler. Claim 13 An artificial turf system capable of four seasons, wherein the shock-absorbing pad is manufactured by foaming a PE (Polyethylene)-based material by a factor of 25 to 35 and has a Shore C of 30 to 40. Claim 14 The artificial turf system capable of four seasons, wherein the drainage plate is characterized by having a plurality of drainage holes with a diameter of 6 to 10 mm perforated at predetermined intervals. Claim 15 In claim 1, the artificial turf system is a four-season artificial turf system characterized by satisfying FIFA Quality Pro standards with a rotational resistance of 28 to 42 N·m and a vertical deformation of 5 to 7 mm.

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