Improved cushioning artificial turf structure

Abstract

To provide an artificial turf structure that maintains its cushioning power for a long period of time and exhibits excellent shock absorbing performance without using any filler.SOLUTION: The present invention relates to an artificial turf structure comprising: a protective layer; a cushioning layer located on a lower surface of the protective layer and having a three-dimensional structure including a front surface layer, an intermediate layer, and a rear surface layer; an air bubble layer located on the lower surface of the cushioning layer; a pile part tufted to the cushioning layer and the air bubble layer; and a backing layer located on the lower surface of the air bubble layer and preventing the pile part from coming off.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This application is a joint venture of Korean Patent Application No. 10-2023-0027, filed on February 28, 2023. No. 172, Korean Patent Application No. 10-2023-00272 filed on February 28, 2023 No. 15, and Korean Patent Application No. 10-2023-00563 filed on April 28, 2023. No. 92, the contents of which are incorporated herein by reference. will be done.

[0002] The present invention relates to an artificial turf structure with improved shock-absorbing properties. [Background technology]

[0003] Artificial turf is a substitute for grass that is made artificially from synthetic fibers. There are no environmental restrictions and management is easy. However, depending on the environmental conditions, there is a risk of loss of filler and damage to the The pressure of the yarn on the floor requires regular brushing, and the filling material needs to be re-maintained. There is the hassle of having to refill it.

[0004] To solve this problem, we applied shock absorbing pads without using particulate fillers. Unfilled artificial turf with shock absorbing pads has been developed and is in use. and the low recovery rate due to repeated loading. Therefore, the shock absorbing pad has a drawback in that its dimensional stability in the width, length and thickness directions is weak.

[0005] Therefore, in order to solve such problems, we developed a non-filled artificial turf structure with excellent cushioning properties. This is a reality that requires development. Summary of the Invention [Problem to be solved by the invention]

[0006] The problem to be solved by the present invention is to provide a cushioning material that maintains its cushioning power for a long period of time and has excellent properties without using any filler. The objective is to provide an artificial turf structure that exhibits shock absorbing properties. [Means for solving the problem]

[0007] The present invention relates to a protective layer; a three-layered film that is located under the protective layer and includes a surface layer, an intermediate layer, and a back layer. a buffer layer having an original structure; a bubble layer located on the lower surface of the buffer layer; the protective layer, the buffer layer and and a pile portion tufted to the cellular layer; and a pile portion located on the lower surface of the cellular layer, a backing layer that prevents the turf portion from coming off.

[0008] In the present invention, the protective layer is in the form of a woven fabric, a nonwoven fabric or a film, and has a thickness of 0. It can be 2 to 3.5 mm.

[0009] In the present invention, the surface layer and the back layer each have a fineness of 120 to 420 denier. The roll can be made of a first yarn and a second yarn having a fineness of 200 to 800 denier. .

[0010] In the present invention, the surface layer is made of a plurality of lattice shapes, and the back surface layer is made of a plurality of honeycomb shapes. It may be in the form of a cam.

[0011] In the present invention, the plurality of lattice shapes are 2 120,000~200,000 per 0 pieces, and multiple honeycomb shapes are 1m 2 35,000 to 60,000 pieces per obtain.

[0012] In the present invention, the intermediate layer connects the surface layer and the back layer and has a fineness of 180 to 8 It can be made of a third yarn of 00 denier.

[0013] In the present invention, the buffer layer may have a thickness of 5 to 20 mm.

[0014] In the present invention, the pile portion includes a first pile yarn and a second pile yarn. The pile yarn and the second pile yarn may be tufted in an overlapping state.

[0015] In the present invention, the pile portion has a length exposed on the surface of the protective layer of 10 to 60 mm. could be. Effect of the Invention

[0016] The artificial turf structure according to the present invention includes a protective layer, which prevents foreign matter from entering the buffer layer. This prevents the artificial turf structure from becoming worn and maintains its high shock absorbing performance for a long period of time.

[0017] In addition, the front and back layers of the buffer layer each have a specific shape, which improves the performance. It is possible to demonstrate excellent shock absorption capabilities.

[0018] In addition, the raw yarns constituting the surface layer, intermediate layer and back layer have a specific fineness. It can exhibit improved shock absorbing capabilities. [Brief description of the drawings]

[0019] [Figure 1] 1 illustrates an artificial turf structure according to the present invention; [Diagram 2] FIG. 2 is a diagram showing the buffer layer of FIG. [Diagram 3] 1 is an actual photograph of the surface layer of a buffer layer according to the present invention. [Figure 4] 1 is an actual photograph of the backside layer of a buffer layer according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The following description will be given in order to enable a person skilled in the art to easily carry out the present invention. The present invention will be described in more detail with reference to embodiments and examples. The present invention can be implemented in various forms and is not limited to the embodiments, examples, etc. described in this specification. Not at all.

[0021] As used herein, the terms "about," "approximately," or similar expressions such as "at least" are used to denote numerical values. When used in relation to the above, the following limits are met: ±10%, ±7%, ±5%, ±3%, ±2% or ±1% theoretical, experimental, statistical, or empirical error is intended to be allowed. do.

[0022] FIG. 1 is a diagram showing an artificial turf structure according to the present invention. The artificial turf structure according to the embodiment includes a protective layer; a surface layer, a middle layer, and a back layer, which are located under the protective layer. a cushioning layer having a three-dimensional structure including a surface layer; a foam layer located on the lower surface of the cushioning layer; and the protective layer. a pile portion tufted on the cushioning layer and the cellular layer; and a cushioning layer disposed on the lower surface of the cellular layer. The pile portion includes a backing layer that prevents the pile portion from coming off.

[0023] In the present invention, the protective layer 110 is a layer for preventing foreign matter from entering the buffer layer 120. The adhesive layer may be in the form of a woven fabric, a nonwoven fabric or a film, preferably in the form of a woven fabric. The protective layer may also contain UV stabilizers, etc., depending on the application.

[0024] The thickness of the protective layer 110 may be 0.2 to 3.5 mm, and preferably 0.4 to 2.5 mm. The thickness of the protective layer 110 may be about 1.25 mm, and more preferably about 1.25 mm. If the thickness is less than the lower limit, it is not easy to prevent foreign matter from entering the buffer layer 120. If the above-mentioned upper limit is exceeded, tufting of the pile portion may not be easy.

[0025] FIG. 2 is a diagram showing the buffer layer of FIG. 1, and FIG. 3 is an actual photograph of the surface layer of the buffer layer according to the present invention. 4 is an actual photograph of the backside layer of the buffer layer according to the present invention.

[0026] The buffer layer 120 includes a surface layer 121, an intermediate layer 122, and a back layer 123, and has a space therein. The three-dimensional structure has improved elastic recovery and drainage of the artificial turf structure 100. It can be raised.

[0027] In addition, in the present invention, the buffer layer 120 improves the shock absorbing ability of the artificial turf structure 100. The layer is made of polyethylene terephthalate (PET). phthalate, polybutylene terephthalate rephthalate, polytrimethylene terephthalate ylene terephthalate), polyamide, poly Ethylene (polyethylene), polypropylene ) and acrylic. It can be done.

[0028] In the present invention, the first layer constituting the surface layer 121, the back layer 123 and the intermediate layer 122 The yarn, the second yarn and the third yarn may be fibers of the same or different materials.

[0029] In the present invention, the thickness of the buffer layer 120 may be 5 to 20 mm, and preferably 8 to 12 mm. The above range is preferable since excellent impact absorbing ability, durability, etc. are achieved within the above range.

[0030] Referring to FIG. 3, in the present invention, the surface layer 121 is located under the protective layer 110. The surface layer 121 is a layer that protects the intermediate layer 122 from damage caused by external forces. A first yarn having a denier of 120 to 420 and a second yarn having a denier of 200 to 800. The first raw yarn may be formed of yarn, and preferably has a fineness of 150 to 400 denier. The surface layer 121 may be formed of a second yarn having a denier of 250 to 750. If the fineness of the first and second yarns is less than the above-mentioned lower limit, The surface layer 121 and the back layer 123 may be damaged. If the upper limit value is exceeded, Tufting of the roll portion 140 is not easy, and workability may decrease.

[0031] The surface layer 121 is made of 30 to 70% by weight of the first yarn and 30 to 70% by weight of the second yarn. Preferably, the first yarn comprises 45 to 55% by weight and the second yarn comprises 45 to 55% by weight. If the weight percent of the first yarn is less than the lower limit, the tufted yarn may be tuffed. The front layer 121 and the back layer 123 may be damaged during heating, and if the upper limit value is exceeded, If the pile portion 140 is too long, tufting of the pile portion 140 may not be easy, and workability may decrease.

[0032] In the present invention, the surface layer 121 may be made of a plurality of lattice shapes, and the lattice shape may be 1m 2 There may be 120,000 to 200,000 particles per square meter, and preferably 1 m 2 There can be 137,000 to 165,000 per square meter. 2 If the thickness is less than the lower limit, the durability of the buffer layer 120 may decrease. m 2 If the upper limit value is exceeded, the tufting of the pile portion 140 becomes difficult. , the shock absorbing ability of the buffer layer 120 may decrease.

[0033] Referring to FIG. 4, in the present invention, the back layer 123 is formed by preventing the intermediate layer 122 from being damaged by an external force. The back layer 123 is a layer that protects the fabric from damage. It is preferable that the first yarn is made of a 1st yarn and the second yarn is made of a 200 to 800 denier. Generally, the first yarn has a fineness of 150 to 400 denier, and the second yarn has a fineness of 250 to 750 denier. The fibers of the first and second yarns forming the back layer 123 may be If the thickness is less than the lower limit, the surface layer 121 and the back layer 123 may be damaged during tufting. If the upper limit is exceeded, the tufting of the pile portion 140 may be difficult. Instead, workability may decrease.

[0034] The back layer 123 is made of 30 to 70% by weight of the first yarn and 30 to 70% by weight of the second yarn. Preferably, the first yarn comprises 45 to 55% by weight of the second yarn and 45 to 55% by weight of the third yarn. If the weight percent of the first yarn is less than the lower limit, the tufted yarn may be tuffed. The front layer 121 and the back layer 123 may be damaged during heating, and if the upper limit value is exceeded, If the pile portion 140 is too long, tufting of the pile portion 140 may not be easy, and workability may decrease.

[0035] In the present invention, the back layer 123 may be formed of a plurality of honeycomb shapes. The shape is 1m 2There can be 35,000 to 60,000 per unit area, and preferably 1 m 2 There can be 40,000 to 55,600 honeycomb structures per cell. 1m 2 If the temperature is less than the lower limit, the durability of the buffer layer 120 may decrease. , 1m 2 If the above-mentioned upper limit is exceeded, tufting of the pile portion 140 becomes difficult. Otherwise, the shock absorbing ability of the buffer layer 120 may decrease.

[0036] In the present invention, the surface layer 121 is manufactured in a lattice shape, and the back layer 123 is manufactured in a honeycomb shape. By doing so, the artificial turf structure 100 according to the present invention has an impact absorption rate of 50% according to the KS standard. Thus, the vertical deformation can be satisfied within the range of 3 to 10 mm.

[0037] In the present invention, the intermediate layer 122 is disposed between the front layer 121 and the back layer 123. This layer connects the front layer 121 and the back layer 123 and improves the shock absorbing ability of the buffer layer 120. The intermediate layer 122 may be formed of a third yarn having a fineness of 180 to 800 denier. Preferably, the third yarn has a fineness of 210 to 750 denier. The third yarn may be a mono yarn. If the third yarn forming the intermediate layer 122 is less than the lower limit value described above, If the above upper limit is exceeded, the pile portion 14 may become deformed. Tufting of 0 is not easy and workability may decrease.

[0038] In the present invention, the connection between the front layer 121 and the back layer 123 is such that both ends of the third yarn are connected to the front layer 121 and the back layer 123. The third yarn is connected to the surface layer 121 and the back layer 123 in a regular or irregular manner with straight or oblique lines. They can be stacked and connected.

[0039] In addition, in the present invention, the buffer layer 120 is made of a commercially available 3D spacer fabric. The product can be applied.

[0040] In the present invention, the air bubble layer 130 can be located on the underside of the back layer 123, and the artificial turf structure It provides the shape stability of the structure 100 and serves to firmly seat and fix the pile portion 140. Examples of materials that can be used include polyolefins, polyethylene terephthalate, and polyvinylidene chloride. and nylon. Preferably, the nonwoven fabric is a polyethylene terephthalate nonwoven fabric, and the nonwoven fabric is a spunbonded fabric. From the group consisting of a melt-blowing method, a needle punching method and a spun lace method It can be manufactured in any one of the selected ways.

[0041] In the present invention, the pile portion 140 may be composed of a plurality of pile yarns, and may be provided with a protective layer. The layer 110, the cushioning layer 120 and the foam layer 130 can be tufted. The pile portion 140 is secured by penetrating the air bubble layer 130, the cushioning layer 120 and the protective layer 110. The protective layer 110 may be exposed on the surface thereof.

[0042] The length of the exposed pile portion 140 may be 10 to 60 mm, and preferably 30 to 55 mm. If the length of the exposed pile portion is less than the above-mentioned lower limit, the artificial turf structure If the upper limit is exceeded, the shape stability may be deteriorated. Can be difficult to maintain.

[0043] In the present disclosure, the fineness of the pile yarns may be 500 to 3,000 denier, and is preferably The pile yarn may be 650 to 2,700 denier, or the pile yarn may be Monosal. The thread material is polyethylene, polypropylene, polyamide, polyethylene terephthalate , polybutylene terephthalate, and polytrimethylene terephthalate There may be one or more of these.

[0044] In the present invention, the backing layer 150 can be located on the underside of the foam layer 130; This layer is used to prevent the pile yarn from coming off. It is made of polyolefin, polyethylene terephthalate. Woven fabric or fabric made of one or more fibers selected from the group consisting of polyvinylidene chloride and nylon. may be a nonwoven fabric. Preferably, it may be a polyethylene terephthalate nonwoven fabric. Nonwoven fabrics are spunbond, meltblowing, needle punching and spunlace. The semiconductor device may be manufactured by any one of the methods selected from the group consisting of a semiconductor device, ...

[0045] In accordance with yet another embodiment of the present invention, an artificial turf structure 100 includes a protective layer 110; and has a three-dimensional structure including a surface layer 221, an intermediate layer 222, and a back layer 223. a buffer layer 220; an air bubble layer 130 located on the lower surface of the buffer layer 220; a protective layer 110; 20 and a pile portion 140 tufted to the cellular layer 130; and a lower surface of the cellular layer 130 The backing layer 150 is positioned to prevent the pile portion 140 from coming off.

[0046] Except for the contents described below, the protective layer 110, the surface layer 221, the intermediate layer 222 and the back surface The layer 223, the foam layer 130, the pile section 140 and the backing layer 150 are described above. The protective layer 110, the surface layer 121, the intermediate layer 122 and the back layer 123, the air bubble layer 130, The same is true for the core portion 140 and the backing layer 150 .

[0047] In the present invention, the buffer layer 220 is impregnated with an elastic material. The elastic material is a polyurethane resin. , polyvinyl acetate resin, styrene polymer resin, natural rubber, EPDM (Ethyl ene-Propylene Diene Monomer) rubber, acrylic rubber, butyric acid The rubber may be one or more selected from the group consisting of polyvinyl rubber and silicone rubber, and preferably polyvinyl rubber. It may be a urethane resin.

[0048] Specifically, the styrene-based polymer resin is a styrene-ethylene-butadiene-styrene copolymer. Polymer, styrene-butadiene-styrene copolymer, styrene-ethylene-propylene- Styrene copolymers, hydrogenated styrene-isoprene-butadiene copolymers and styrene-isoprene The polymer may be one or more selected from the group consisting of isoprene-styrene copolymers.

[0049] Acrylic rubber is made up of methyl acrylate, ethyl acrylate, and n-propyl acrylate. acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, hexyl methacrylate methacrylate, 2-ethylhexyl methacrylate, and mixtures thereof. The polymer may be a polymer of the monomer.

[0050] Butyl rubber is a copolymer of isobutylene and isoprene (IIR), bromobutyl rubber, etc. It could be.

[0051] In the present invention, the content of the elastic material impregnated in the buffer layer 220 is the total weight of the buffer layer 220. %. The content of the buffer layer 2 may be 10 to 50% by weight, and preferably 20 to 40% by weight. The content of the elastic material impregnated in 20 can be measured by the following method.

[0052] The buffer layer 220 is impregnated with an elastic material and dried at 80 to 100° C. for 2 hours. The elastic material content is calculated using the following mathematical formula 1.

[0053]

number

[0054] In the present invention, the content of the elastic material contained in the buffer layer 220 is less than the above-mentioned lower limit. If the improvement in shock absorption is not significant, and if the upper limit mentioned above is exceeded, tufting becomes difficult. However, the voids in the buffer layer 220 are excessively reduced, and the shock absorbing capacity is reduced compared to the elastic material content. The degree of improvement is not large. Therefore, the above range is preferable.

[0055] In the present invention, the density of the surface layer 221 is 0.05 to 0.4 g / cm 3 It can be the middle layer The density of 222 is 0.01 to 0.1 g / cm 3 The density of the back surface layer 223 may be 0.1 to 0 .4g / cm 3 Preferably, the density of the surface layer 221 is 0.1 to 0.3 g / cm 3 and the density of the intermediate layer 222 may be 0.02 to 0.05 g / cm 3 and the back layer 22 3. Density is 0.1~0.3g / cm 3 The surface layer 221, the intermediate layer 222 and the back surface If the density of the layer 223 is less than the above-mentioned lower limit, the shock absorbing ability may decrease. If the upper limit is exceeded, tufting of the pile yarn becomes difficult and impregnation of the elastic material becomes difficult. It can be difficult.

[0056] In accordance with another embodiment of the present invention, an artificial turf structure 100 includes a protective layer 110; The flexible substrate 320 has a three-dimensional structure including a surface layer 321, an intermediate layer 322, and a back layer 323. A cushioning layer 320; a foam layer 130 located on the lower surface of the cushioning layer 320; a protective layer 110; and a cushioning layer 320. and a pile portion 140 tufted to the cellular layer 130; and a pile portion 140 located on the lower surface of the cellular layer 130. The backing layer 150 prevents the pile portion 140 from coming off. By forming a buffer layer 320 having an original structure; and heating the buffer layer 320 It can be manufactured.

[0057] Except for the contents described below, the protective layer 110, the surface layer 321, the intermediate layer 322 and the back surface The layer 323, the foam layer 130, the pile section 140 and the backing layer 150 are described above. The protective layer 110, the surface layer 121, the intermediate layer 122 and the back layer 123, the air bubble layer 130, The same is true for the core portion 140 and the backing layer 150 .

[0058] In the present invention, the buffer layer 320 includes the steps of: preparing a buffer layer 320 having a three-dimensional structure; and heating the buffer layer 320. The process is carried out at a temperature of 130 to 170°C and a speed of 2 to 5 m / min for 5 to 60 seconds. Preferably, the temperature is 140 to 160° C. and the speed is 2.5 to 4 m / min. The heating step can proceed for 30 seconds. If the temperature is less than 130°C, the buffer The adhesion of the layer 320 may be insufficient, and the elastic recovery force may decrease. If the temperature exceeds 170°C, For example, the elastic recovery force is excellent, but the production cost and the like are high, and the production efficiency may decrease.

[0059] Also, if the speed is less than 2 m / min, the elastic recovery is excellent, but the production efficiency decreases. If the speed exceeds m / min, the adhesion of the buffer layer 320 is insufficient, and the elastic recovery force is reduced. If the heating time is less than 5 seconds, the adhesion of the buffer layer 320 is insufficient, and the elasticity is poor. If the time exceeds 60 seconds, the elastic recovery is excellent, but the manufacturing cost is increased. The cost etc. may be high, resulting in reduced production efficiency.

[0060] The heating time means the time during which the manufactured buffer layer 320 is heated in a heating device. Specifically, it means the time difference between when one end of the buffer layer 320 enters the heating device and when it leaves the heating device. .

[0061] In the present invention, the weight per unit area of ​​the surface layer 321 is 150 to 450 g / m 2 Yes The weight per unit area of ​​the intermediate layer 322 is 1,700 to 2,300 g / m 2 It could be The weight per unit area of ​​the back surface layer 323 may be 300 to 600 g. The weight per unit area of ​​the surface layer 321 is 200 to 400 g / m 2 and the intermediate layer 322 Weight per unit area is 1,900~2,100g / m 2 The unit of the back layer 323 may be Weight per area is 400-500g / m 2 The surface layer 321, the intermediate layer 322, and The weight per unit area of ​​the back layer 323 is 150 g / m 2 , 1,700g / m 2 Reach and 300g / m 2 If it is less than 450g / m 2 , 2300g / m2 and 600 g / m 2 If it exceeds this limit, the shock absorption rate will decrease. There is.

[0062] In accordance with another embodiment of the present invention, a method for manufacturing an artificial turf structure 100 includes: a) forming a three-dimensional structure; b) heating the buffer layer 320 at a temperature of 130 to 170° C. for 2 to 40 minutes; and c) heating the protective layer 110, the buffer layer 320 and the d) placing the foam layer 130 and then tufting the pile portion 140; A backing layer 150 is placed on the underside of 40, and the backing layer 150 is heated at a temperature of 140 to 180° C. at a rate of 2 to 5 mm / s. n speed for 5 to 60 seconds;

[0063] Except for the contents described below, the protective layer 110, the surface layer 321, the intermediate layer 322 and the back surface The layer 323, the foam layer 130, the pile section 140 and the backing layer 150 are described above. The protective layer 110, the surface layer 121, the intermediate layer 122 and the back layer 123, the air bubble layer 130, The same is true for the core portion 140 and the backing layer 150 .

[0064] Step a) is a step of manufacturing a buffer layer 320 having a three-dimensional structure, and step b) is a step of manufacturing the buffer layer 320 having a three-dimensional structure. and heating and bonding the buffer layer 320 having the three-dimensional structure to manufacture the buffer layer 320. The heating in step b) can be preferably carried out using a Stame Dryer. The heating conditions were the same as those described above.

[0065] The heating time means the time during which the manufactured buffer layer 320 is heated in the heating device. refers to the time difference between when one end of the buffer 320 enters and exits the heating device.

[0066] Also, step c) is to position the protective layer 110, the buffer layer 320 and the air bubble layer 130 to form a pipe. This step involves tufting the tuft portion 140, which is a method well known in the art. may be used without restriction.

[0067] Step d) is to place the backing layer 150 on the underside of the foam layer 130 and then heat it to form a foam. The cushioning layer 320 is secondarily fixed by heat-sealing the cushioning portion 140, and the elastic recovery of the cushioning layer 320 is improved. This is the stage where you improve your strength.

[0068] The heating in step d) is performed at a temperature of 140 to 180°C and at a speed of 2 to 5 m / min for 5 to 60 min. The melting rate can be increased for 2 seconds, preferably at a temperature of 150 to 170°C and at a rate of 2.5 to 4 m / min. n for 10 to 30 seconds. If the temperature is less than 140°C or the speed If the speed is less than 2 m / min or the heating time is less than 5 seconds, the pile portion 140 may not melt. The adhesion of the buffer layer 320 is insufficient, resulting in a decrease in the pull-out strength. The elastic recovery force of 0 may decrease. If the temperature exceeds 180℃ or the speed exceeds 5m / min, If the time is longer than 60 seconds, the elastic recovery is excellent, but the pile portion 140 is over-fused and the shape is not good. The stability of the fabric is reduced. Therefore, the first yarn, the second yarn, the third yarn and the pile part melt. Appearance quality may be reduced.

[0069] The heating time means the time during which the manufactured artificial turf structure is heated in the heating device, and specifically refers to the time difference between when one end of the artificial turf structure enters and exits the heating device.

[0070] The present invention will now be described with reference to specific examples.

[0071] Buffer layer manufacturing example 1 Using a double Raschel machine, a 10mm thick sheet consisting of a surface layer, a middle layer and a back layer is made. A three-dimensional structure was produced. The thicknesses of the surface layer, the middle layer, and the back layer were 2 mm, 6 mm, and The surface layer and the back layer were made of 150 denier polyethylene terephthalate. 50% by weight of 250 denier polyethylene terephthalate first yarn and 50% by weight of 250 denier polyethylene terephthalate second yarn. The middle layer is made of 210 denier polyethylene terephthalate 3rd yarn (mono The surface layer is 1m thick. 2 Each layer is formed in a grid of approximately 160,000 pieces. 1m 2 Each was formed into a honeycomb shape with approximately 54,500 pieces.

[0072] Buffer layer manufacturing example 2 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 2. The buffer layer was prepared in the same manner as in Example 1, except that the denier of the raw yarn was changed to 300. Manufactured.

[0073] Buffer layer manufacturing example 3 In the buffer layer manufacturing example 1, the first polyethylene terephthalate layer constituting the front layer and the back layer was 2. The buffer layer was prepared in the same manner as in Example 1 except that the denier of the raw yarn was changed to 750. Manufactured.

[0074] Buffer layer manufacturing example 4 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was The buffer layer was prepared in the same manner as in Example 1 except that the denier of the raw yarn was changed to 400. Manufactured.

[0075] Buffer layer manufacturing example 5 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 400, and the denier of the second raw yarn was changed to polyethylene terephthalate. A buffer layer was manufactured in the same manner as in buffer layer manufacturing example 1, except that the pH was changed to 300.

[0076] Buffer layer manufacturing example 6 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 400, and the denier of the second raw yarn was changed to polyethylene terephthalate. A buffer layer was manufactured in the same manner as in buffer layer manufacturing example 1, except that the viscosity was changed to 750.

[0077] Buffer layer manufacturing example 7 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 400, and the denier of the second raw yarn was changed to polyethylene terephthalate. 750, and the polyethylene terephthalate third yarn (mono yarn) that constitutes the middle layer is A buffer layer was produced in the same manner as in Example 1, except that the Nial was changed to 450.

[0078] Buffer layer manufacturing example 8 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 400, and the denier of the second raw yarn was changed to polyethylene terephthalate. 750, and the polyethylene terephthalate third yarn (mono yarn) that constitutes the middle layer is A buffer layer was produced in the same manner as in Example 1, except that the Nial was changed to 750.

[0079] Buffer layer manufacturing example 9 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. m and 1 mm.

[0080] The front and back layers are each made of 50% polyethylene terephthalate fiber of about 150 denier. 50% by weight and 50% by weight of polyethylene terephthalate fiber of about 250 denier. The intermediate layer was made of polyethylene terephthalate fiber (mono yarn) with a diameter of about 0.27 mm. Surface layer 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter. 2 About The structure was formed with 47,500 honeycomb shapes. In addition, the surface layer, the middle layer and the back layer The density of each is approximately 0.22 g / cm 3 , about 0.025g / cm 3 and about 0.22 g / c m 3 It was.

[0081] The three-dimensional structure is impregnated with polyurethane resin and then heated at 80 to 100°C for approximately 2 hours. The elastic material content calculated by the following mathematical formula 1 is about 30% by weight.

[0082]

number

[0083] Buffer layer manufacturing example 10 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. m and 1 mm.

[0084] The front and back layers are each made of 50% polyethylene terephthalate fiber of about 150 denier. 50% by weight and 50% by weight of polyethylene terephthalate fiber of about 250 denier. The intermediate layer was made of polyethylene terephthalate fiber (mono yarn) with a diameter of about 0.27 mm. Surface layer 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter, and the back layer is 1 m 2 About 4 per The structure was formed with 7,500 honeycomb shapes. In addition, the surface layer, middle layer and back layer The density is approximately 0.22 g / cm 3 , about 0.025g / cm 3 and about 0.22 g / cm 3 It was.

[0085] The three-dimensional structure is impregnated with polyurethane resin and then heated at 80 to 100°C for approximately 2 hours. The elastic material content calculated by the above mathematical formula 1 is about 10% by weight.

[0086] Buffer layer manufacturing example 11 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. m and 1 mm.

[0087] The front and back layers are each made of 50% polyethylene terephthalate fiber of about 150 denier. 50% by weight and 50% by weight of polyethylene terephthalate fiber of about 250 denier. The intermediate layer was made of polyethylene terephthalate fiber (mono yarn) with a diameter of about 0.27 mm. Surface layer 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter, and the back layer is 1 m 2 About 4 per The structure was formed with 7,500 honeycomb shapes. In addition, the surface layer, middle layer and back layer The density is approximately 0.22 g / cm 3, about 0.025g / cm 3 and about 0.22 g / cm 3 It was.

[0088] The three-dimensional structure is impregnated with polyurethane resin and then heated at 80 to 100°C for approximately 2 hours. The elastic material content calculated by the above mathematical formula 1 is about 50% by weight.

[0089] Buffer layer manufacturing example 12 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. m and 1 mm.

[0090] The front and back layers are each made of 50% polyethylene terephthalate fiber of about 150 denier. 50% by weight and 50% by weight of polyethylene terephthalate fiber of about 250 denier. The intermediate layer was made of polyethylene terephthalate fiber (mono yarn) with a diameter of about 0.27 mm. Surface layer 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter, and the back layer is 1 m 2 About 4 per The structure was formed with 7,500 honeycomb shapes. In addition, the surface layer, middle layer and back layer The density is approximately 0.05 g / cm 3 , about 0.01g / cm 3 and about 0.05 g / cm 3 It was.

[0091] The three-dimensional structure is impregnated with polyurethane resin and then heated at 80 to 100°C for approximately 2 hours. The elastic material content calculated by the above mathematical formula 1 is about 30% by weight.

[0092] Buffer layer manufacturing example 13 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. m and 1 mm.

[0093] The front and back layers are each made of 50% polyethylene terephthalate fiber of about 150 denier. 50% by weight and 50% by weight of polyethylene terephthalate fiber of about 250 denier. The intermediate layer was made of polyethylene terephthalate fiber (mono yarn) with a diameter of about 0.27 mm. Surface layer 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter, and the back layer is 1 m 2 About 4 per The structure was formed with 7,500 honeycomb shapes. In addition, the surface layer, middle layer and back layer The density is approximately 0.4g / cm 3 , about 0.1g / cm 3 and about 0.4 g / cm 3 Yes Ta.

[0094] The three-dimensional structure is impregnated with polyurethane resin and then heated at 80 to 100°C for approximately 2 hours. The elastic material content calculated by the above mathematical formula 1 is about 30% by weight.

[0095] Buffer layer manufacturing example 14 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. The three-dimensional structure was dried using a Stame Dryer for about 1 The buffer layer was produced by heating at 50° C. for 20 seconds at a speed of about 3 m / min.

[0096] The surface layer and the back layer are each made of 150 denier polyethylene terephthalate first yarn 5 0% by weight and 50% by weight of 250 denier polyethylene terephthalate second yarn. The middle layer is made of polyethylene terephthalate yarn (mono yarn) with a diameter of 0.27 mm. The surface layer is 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter, and the back layer is 1 m 2 About The honeycomb shape was formed with 47,500 pieces. The unit area of ​​the surface layer, intermediate layer and back layer was Each weighs approximately 300g / m 2 , about 2,000g / m 2 and about 450 g / m 2 It was.

[0097] Buffer layer manufacturing example 15 In buffer layer manufacturing example 14, except that the heating temperature of the three-dimensional structure was changed to about 130°C. In this case, a buffer layer was produced in the same manner as in Buffer Layer Production Example 14.

[0098] Buffer layer manufacturing example 16 In buffer layer manufacturing example 14, except that the heating temperature of the three-dimensional structure was changed to about 170°C. In this case, a buffer layer was produced in the same manner as in Buffer Layer Production Example 14.

[0099] Buffer layer comparison manufacturing example 1 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was The buffer layer was prepared in the same manner as in Example 1 except that the denier of the raw yarn was changed to 100. Manufactured.

[0100] Buffer layer comparison manufacturing example 2 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 100, and the denier of the second raw yarn was changed to polyethylene terephthalate. A buffer layer was manufactured in the same manner as in buffer layer manufacturing example 1, except that the pH was changed to 300.

[0101] Buffer layer comparison manufacturing example 3 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 100, and the denier of the second raw yarn was changed to polyethylene terephthalate. A buffer layer was manufactured in the same manner as in buffer layer manufacturing example 1, except that the viscosity was changed to 750.

[0102] Buffer layer comparison manufacturing example 4 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was The buffer layer was prepared in the same manner as in Example 1 except that the denier of the raw yarn was changed to 450. Manufactured.

[0103] Buffer layer comparison manufacturing example 5 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 450, and the denier of the second raw yarn was changed to polyethylene terephthalate. A buffer layer was manufactured in the same manner as in buffer layer manufacturing example 1, except that the pH was changed to 300.

[0104] Buffer layer comparison manufacturing example 6 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 450, and the denier of the second raw yarn was changed to polyethylene terephthalate. A buffer layer was manufactured in the same manner as in buffer layer manufacturing example 1, except that the viscosity was changed to 750.

[0105] Buffer layer comparison manufacturing example 7 In the buffer layer manufacturing example 1, the polyethylene terephthalate first layer constituting the front layer and the back layer was 1. The denier of the raw yarn was changed to 400, and the denier of the second raw yarn was changed to polyethylene terephthalate. 750, and the polyethylene terephthalate third yarn (mono yarn) that constitutes the middle layer is A buffer layer was produced in the same manner as in Example 1, except that the Neal was changed to 150.

[0106] Buffer layer comparison manufacturing example 8 In buffer layer manufacturing example 8, the shape of the front layer and the back layer was formed into a lattice. A buffer layer was produced in the same manner as in Buffer Layer Production Example 8.

[0107] Buffer layer comparison manufacturing example 9 In buffer layer manufacturing example 8, the shape of the front layer and the back layer were all formed with honeycomb. In this case, a buffer layer was produced in the same manner as in Buffer Layer Production Example 8.

[0108] Buffer layer comparison manufacturing example 10 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. m and 1 mm.

[0109] The front and back layers are each made of 50% polyethylene terephthalate fiber of about 150 denier. 50% by weight and 50% by weight of polyethylene terephthalate fiber of about 250 denier. The intermediate layer was made of polyethylene terephthalate fiber (mono yarn) with a diameter of about 0.27 mm. Surface layer 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter, and the back layer is 1 m 2 About 4 per The structure was formed with 7,500 honeycomb shapes. In addition, the surface layer, middle layer and back layer The density is approximately 0.22 g / cm 3 , about 0.025g / cm 3 and about 0.22 g / cm 3 It was.

[0110] Buffer layer comparison manufacturing example 11 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. m and 1 mm.

[0111] The front and back layers are each made of 50% polyethylene terephthalate fiber of about 150 denier. 50% by weight and 50% by weight of polyethylene terephthalate fiber of about 250 denier. The intermediate layer was made of polyethylene terephthalate fiber (mono yarn) with a diameter of about 0.27 mm. Surface layer 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter, and the back layer is 1 m 2 About 4 per The structure was formed with 7,500 honeycomb shapes. In addition, the surface layer, middle layer and back layer The density is approximately 0.22 g / cm 3 , about 0.025g / cm 3 and about 0.22 g / cm 3 It was.

[0112] The three-dimensional structure is impregnated with polyurethane resin and then heated at 80 to 100°C for approximately 2 hours. The elastic material content calculated by the above mathematical formula 1 is about 5% by weight.

[0113] Buffer layer comparison manufacturing example 12 Using a double Raschel machine, the thickness of the surface layer, middle layer and back layer is about 10m. A three-dimensional structure of 1 mm was fabricated. The thicknesses of the surface layer, middle layer, and back layer were 1 mm, 8 mm, and 10 mm, respectively. m and 1 mm.

[0114] The front and back layers are each made of 50% polyethylene terephthalate fiber of about 150 denier. 50% by weight and 50% by weight of polyethylene terephthalate fiber of about 250 denier. The intermediate layer was made of polyethylene terephthalate fiber (mono yarn) with a diameter of about 0.27 mm. Surface layer 1m 2 Approximately 160,000 pieces are formed in a grid pattern per square meter, and the back layer is 1 m 2 About 4 per The structure was formed with 7,500 honeycomb shapes. In addition, the surface layer, middle layer and back layer The density is approximately 0.22 g / cm 3 , about 0.025g / cm 3 and about 0.22 g / cm 3 It was.

[0115] The three-dimensional structure is impregnated with polyurethane resin and then heated at 80 to 100°C for approximately 2 hours. The elastic material content calculated by the above mathematical formula 1 is about 70% by weight.

[0116] Buffer layer comparison manufacturing example 13 In buffer layer manufacturing example 14, except that the heating temperature of the three-dimensional structure was changed to about 100°C. In this case, a buffer layer was produced in the same manner as in Buffer Layer Production Example 14.

[0117] Buffer layer comparison manufacturing example 14 In buffer layer manufacturing example 14, except that the heating temperature of the three-dimensional structure was changed to about 200°C. In this case, a buffer layer was produced in the same manner as in Buffer Layer Production Example 14.

[0118] Buffer layer comparison manufacturing example 15 In buffer layer manufacturing example 14, the heating rate of the three-dimensional structure was changed to about 0.5 m / min. A buffer layer was prepared in the same manner as in Buffer Layer Preparation Example 14, except for the above.

[0119] Buffer layer comparison manufacturing example 16 In buffer layer manufacturing example 14, the heating speed of the three-dimensional structure was changed to about 7 m / min. A buffer layer was produced in the same manner as in Buffer Layer Production Example 14, except for the above.

[0120] Buffer layer comparison manufacturing example 17 In buffer layer manufacturing example 14, the buffer layer manufacturing method was the same as that in Example 14, except that the three-dimensional structure was not heated. A buffer layer was produced in the same manner as in Example 14.

[0121] Pile yarn manufacturing example 0.942g / cm 3 The density of 220,000, the molecular weight of 20, and the molecular weight distribution (Mw / 100 parts by weight of polyethylene having Mn), no compatibilizer 1.25 parts by weight of maleic acid water, 6.25 parts by weight of pigment, and 0.5 parts by weight of flame retardant were added. A molecular mixture was prepared. The prepared mixture was heated to prepare a mixed melt. The molten mixture was extruded to produce the first pile yarn. The pile yarn had a fineness of about 1,200 denier. be.

[0122] The following Table 1 shows the first yarn, the second yarn, and the third yarn in the buffer layer manufacturing examples 1 to 8 and the comparative manufacturing examples 1 to 9. 1 is a table showing the denier of the second and third yarns and the shapes of the surface layer and back layer.

[0123] [Table 1]

[0124] Examples 1 to 8 and Comparative Examples 1 to 10 A protective layer was prepared using woven polypropylene fabric having a thickness of approximately 1.25 mm.

[0125] In addition, a polyethylene terephthalate nonwoven fabric with a thickness of about 0.75 mm was used to form a bubble layer and A backing layer was then prepared.

[0126] The protective layer, the buffer layer and the bubble layer are positioned, and the first pile yarn is tufted. Then, the bubble layer is The backing layer is placed on the bottom surface of the sheet, and the sheet is heat-sealed at about 160°C using a surface heat-sealing device. The artificial turf structure was manufactured by heating at a speed of 10 ... The results are shown in Table 2.

[0127] [Table 2]

[0128] Experimental Example 1 The denier of the raw yarn constituting the surface layer and the back layer during tufting In order to measure the presence or absence of damage and the needle penetration load during tufting, Examples 1 to 6 The artificial turf structures manufactured in Comparative Examples 1 to 6 were measured by the following measuring methods, and the results are shown below. This is described in 3.

[0129] [Measurement method] Damage to the surface and back layers: Visually check for broken yarn and changes in pattern shape. R ◎: No change in yarn of the surface layer or back layer after tufting, no change in pattern shape ○: No change in the yarn of the surface layer or back layer after tufting, partial change in pattern shape X: Some of the yarns in the front and back layers after tufting break, and the pattern shape changes Needle penetration load: Visually check for slack in the raw yarn ◎: Continuous tufting work is possible without difficulty ○: Continuous tufting is possible, but some of the yarn may bend and cause problems with yarn fixation. Additional work is required to X: Needle penetration is difficult during tufting, causing equipment load

[0130] [Table 3]

[0131] Referring to Table 3 above, the denier of the first yarn constituting the surface layer and the back layer is 100. In the cases (Comparative Examples 1 to 3), the surface layer and the back layer were damaged during tufting, and When the denier of the first yarn constituting the surface layer is 450 (Comparative Examples 4 to 6), tufting is performed. It can be seen that the penetration load during tufting is high and tufting is not easy.

[0132] On the other hand, when the denier of the first yarn constituting the surface layer and the back layer is 150 or 400 (actual In Examples 1 to 6, the surface layer and the back layer were not damaged during tufting, and the tufting was not penetrated. It can be seen that the load is low and tufting is easy.

[0133] Experimental Example 2 In order to measure the permanent compression rate by denier of the third yarn constituting the intermediate layer, The artificial turf structures manufactured in Examples 1 to 8 and Comparative Example 7 were measured by the following measurement method, and the results are shown in Table 4. was described in.

[0134] [Measurement method] Permanent compression rate: A constant load (1.8 kN) was applied to the sample for approximately 22 hours, and then the sample was allowed to recover for approximately 48 hours. After that, the permanent compression rate is measured based on the change in thickness.

[0135] [Table 4]

[0136] Referring to Table 4 above, the denier of the third yarn (mono yarn) constituting the middle layer is 150. In the case of Comparative Example 7, the permanent compression rate was 60% or more, which was not good, but the third yarn (mono yarn) When the roll is 210, 450 or 750 (Examples 6 to 8), the permanent compression rate is 45% or less. It can be confirmed that it is.

[0137] Experimental Example 3 In order to measure the impact absorption rate, vertical deformation and penetration load depending on the shape of the surface layer and the back layer, The artificial turf structures manufactured in Example 8, Comparative Example 8, and Comparative Example 9 were measured by the following measurement method. The results are shown in Table 5.

[0138] [Measurement method] Impact absorption rate and vertical deformation: The impact absorption rate of the sample was measured more than three times using a Field Tester device. The yield and vertical deformation values ​​were measured, and the average value was calculated from the remaining values ​​after excluding the primary measurement value. Needle penetration load: Visually check for slack in the raw yarn. ◎: Continuous tufting work is possible without difficulty ○: Continuous tufting is possible, but some of the yarn may bend and cause problems with yarn fixation. Additional work is required to X: Needle penetration is difficult during tufting, causing equipment load

[0139] [Table 5]

[0140] Referring to Table 5, when the surface layer and the back layer have the lattice and honeycomb shapes (Example 8), The impact absorption rate is over 50%, the vertical deformation is 9mm, and it meets the KS standard. It can be seen that the thickness is low and tufting is easy.

[0141] On the other hand, when the surface layer and the back layer are in the form of a lattice (Comparative Example 8), the impact absorption rate is 47%, which is KS It does not meet the standards, the penetration load is high, tufting is not easy, and the surface and back layers When the shape is honeycomb (Comparative Example 9), the vertical deformation is 13 mm, which does not satisfy the KS standard. can be confirmed.

[0142] Experimental Example 4 In order to measure the impact absorption rate, vertical deformation and penetration load with and without the protective layer, The artificial turf structures manufactured in Comparative Example 10 and Comparative Example 11 were measured by the following measuring method, and the results are shown in Table 6. It was posted.

[0143] [Measurement method] Impact absorption rate and vertical deformation: The impact absorption rate of the sample was measured more than three times using a Field Tester device. The yield and vertical deformation values ​​were measured, and the average value was calculated from the remaining values ​​after excluding the primary measurement value. Needle penetration load: Visually check for slack in the raw yarn. ◎: Continuous tufting work is possible without difficulty ○: Continuous tufting is possible, but some of the yarn may bend and cause problems with yarn fixation. Additional work is required to X: Needle penetration is difficult during tufting, causing equipment load

[0144] [Table 6]

[0145] In the case where there is no protective layer (Comparative Example 10), the impact absorption rate and vertical deformation value are higher than those in the case where the protective layer is included ( It can be seen that the amount of the ion exchange resin was reduced from Example 8).

[0146] Examples 9 to 13 and Comparative Examples 11 to 13 A protective layer was prepared using a woven polypropylene fabric with a thickness of about 0.45 mm. Prepare the air bubble layer and backing layer using 45 mm polyethylene terephthalate nonwoven fabric. Ta.

[0147] The protective layer, the buffer layer and the bubble layer are positioned, and the first pile yarn is tufted. Then, the bubble layer is The backing layer is placed on the bottom surface of the sheet, and the sheet is heat-sealed at about 160°C using a surface heat-sealing device. The artificial turf structure was manufactured by heating at a speed of 100000000000000 for 20 seconds. The composition of the buffer layer is shown in Table 7 below. vinegar.

[0148] [Table 7]

[0149] Experimental Example 5 The impact absorption rate and The permanent compression ratio was measured by the following measurement method, and the results are shown in Table 8.

[0150] [Measurement method] Impact absorption rate: KS F 3888-1: Measure the impact absorption of mat test pieces according to the 2022 standard. Determine Permanent compression rate: A constant load (1.8 kN) was applied to the sample for approximately 22 hours, and then the sample was allowed to recover for approximately 48 hours. After that, the permanent compression rate is measured based on the change in thickness.

[0151] [Table 8]

[0152] Referring to Table 8 above, when the elastic material was impregnated (Example 9), Both the impact absorption rate and the permanent compression rate are superior to those in the case where no treatment is applied (Comparative Example 11). can be confirmed.

[0153] On the other hand, when the elastic material content is 10 to 50% by weight (Examples 9 to 11), the five-fold The impact absorption rate and permanent wear rate were measured from the case of 70% by weight (Comparative Example 12) and the case of 70% by weight (Comparative Example 13). It can be seen that both compression ratios are excellent.

[0154] In addition, when the base material of the buffer layer is a double raschel knitted fabric, the density of the surface layer, the middle layer and the back layer is are approximately 0.22g / cm 3 , about 0.025g / cm 3 and about 0.22 g / cm 3 of The impact absorption rate and permanent compression rate of the case (Example 9) are lower than the above numerical ranges (Example 12) or higher (Example 13).

[0155] Examples 14 to 16 and Comparative Examples 14 to 19 A protective layer was prepared using a woven polypropylene fabric with a thickness of about 0.45 mm. Prepare the air bubble layer and backing layer using 45 mm polyethylene terephthalate nonwoven fabric. Ta.

[0156] The protective layer, the buffer layer and the bubble layer are positioned, and the first pile yarn is tufted. Then, the bubble layer is The backing layer is placed on the bottom surface of the sheet, and the sheet is heat-sealed at about 160°C using a surface heat-sealing device. The artificial turf structure was manufactured by heating at a speed of 10 ... The composition of the layers and buffer layers is shown in Table 9 below.

[0157] [Table 9]

[0158] Comparative Example 20 The same procedure as in Example 14 was repeated except that the heating temperature was changed to about 100°C. An artificial turf structure was similarly produced.

[0159] Comparative Example 21 The same procedure as in Example 14 was repeated except that the heating temperature was changed to about 200°C. An artificial turf structure was similarly produced.

[0160] Experimental Example 6 The impact absorption rate and The permanent compression ratio and compressibility were measured by the following method, and the results are shown in Table 10.

[0161] [Measurement method] Impact absorption rate: KS F 3888-1: Measure the impact absorption of mat test pieces according to the 2022 standard. Determine Permanent compression rate: A constant load (1.8 kN) was applied to the sample for approximately 22 hours, and then the sample was allowed to recover for approximately 48 hours. After that, the permanent compression rate is measured based on the change in thickness.

[0162] [Table 10]

[0163] Referring to Table 10 above, the heating temperature of the buffer layer is 130 to 170°C, and the heating rate is about 3 m / min and heating time is 20 seconds, the heating temperature of the backing layer is 160 °C, the heating rate is When the speed was about 3 m / min and the heating time was 20 seconds (Examples 14 to 16), the impact absorption rate was 5 It can be confirmed that the compression ratio is very good, ranging from 6 to 58%, and the permanent compression rate is 23 to 23%. .

[0164] On the other hand, when the heating temperature of the buffer layer was low (Comparative Example 14) compared with Examples 14 to 16, the The adhesion of the shock layer is insufficient, the shock absorption rate is low, and the permanent compression rate is very poor at 41%. However, when the heating temperature was high (Comparative Example 15), adhesion progressed excessively and the impact It can be seen that although the absorption rate is high, the permanent compression rate is low at 38%.

[0165] In addition, when the heating temperature of the buffer layer was low (Comparative Example 16) compared with Examples 14 to 16, the The adhesion of the shock layer is excessive, and the shock absorption rate is high, but the permanent compression rate is low at 37%. When the heat temperature was high (Comparative Example 17), the adhesion of the buffer layer was insufficient, and the impact absorption rate was low. It can be seen that the permanent compression rate is low at 38%.

[0166] In addition, compared to Examples 14 to 16, when the buffer layer was not heated (Comparative Example 18), It can be seen that both the impact absorption rate and the permanent compression rate are low.

[0167] In addition, compared to Examples 14 to 16, when there was no protective layer (Comparative Example 19), the silica sand and the filling It can be seen that the filler has penetrated into the cushioning layer, resulting in a very low impact absorption rate.

[0168] In addition, when the heating temperature of the backing layer was lower than that of Examples 14 to 16 (Comparative Example 20), ) has insufficient adhesion of the buffer layer, low impact absorption rate, and when the heating temperature is high (Comparative Example 21 ) has excessive adhesion, and although it has a high shock absorption rate, its permanent compression rate is low at 39%. It can be confirmed. [Explanation of symbols]

[0169] 100 Artificial Grass Structure 110 Protective layer 120, 220, 320 buffer layer 121, 221, 321 surface layer 122, 222, 322 Middle class 123, 223, 323 Back layer 130 Bubble Layer 140 Pile section 150 Backing Layer

Claims

1. protective layer; A buffer layer is disposed under the protective layer and has a three-dimensional structure including a surface layer, an intermediate layer, and a back layer. layer; a foam layer located on the lower surface of the cushioning layer; a pile portion tufted onto the protective layer, the cushioning layer, and the bubble layer; and a backing layer located on the lower surface of the bubble layer and preventing the pile portion from coming off; Artificial grass structure.

2. The protective layer is in the form of a woven fabric, a nonwoven fabric or a film, and has a thickness of 0.2 to 3.5 mm.

2. The artificial turf structure of claim 1 .

3. The surface layer and the back layer are made of a first yarn having a fineness of 120 to 420 denier and a second yarn having a fineness of 120 to 420 denier.

2. The artificial turf structure according to claim 1, which is formed from a second yarn having a denier of 200 to 800. body.

4. The surface layer is made up of a plurality of lattice shapes, and the back layer is made up of a plurality of honeycomb shapes.

2. The artificial turf structure of claim 1.

5. The plurality of lattice shapes are each 1 m ２ 120,000 to 200,000 pieces per The honeycomb shape is 1m ２ 5. The method according to claim 4, wherein the number of particles is 35,000 to 60,000 per one. Artificial turf structure.

6. The intermediate layer connects the front layer and the back layer and has a fineness of 180 to 800 denier.

10. The artificial turf structure of claim 1 formed from three yarns.

7. The artificial turf structure according to claim 1, wherein the cushioning layer has a thickness of 5 to 20 mm.

8. The pile portion has a length exposed on the surface of the protective layer of 10 to 60 mm.

2. The artificial turf structure as described above.

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