Artificial turf structure with improved cushioning performance

Abstract

To provide an artificial turf structure capable of maintaining a buffering force for a long period of time and exhibiting excellent shock-absorbing ability without using a filler.SOLUTION: The present invention relates to an artificial turf structure including a protective layer; a buffer layer positioned on a lower surface of the protective layer and having a three-dimensional structure including a surface layer, an intermediate layer, and a back layer; an air bubble layer positioned on a lower surface of the buffer layer; a pile part tufted into the protective layer, the buffer layer, and the air bubble layer; and a backing layer positioned on a lower surface of the air bubble layer to prevent the pile part from detaching.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0027172, filed on February 28, 2023, Korean Patent Application No. 10-2023-0027215, filed on February 28, 2023, and Korean Patent Application No. 10-2023-0056392, filed on April 28, 2023, the contents of which are incorporated herein by reference.

[0002] The present invention relates to an artificial turf structure with improved cushioning performance.

Background Art

[0003] Artificial turf is a substitute for grass artificially made in the shape of grass using synthetic fibers as raw materials. Artificial turf is not restricted by the environment and is easy to manage. However, depending on the usage environment conditions, brush management is required periodically due to the loss of the filling material and the trampling of the pile yarn, and there is the hassle of having to refill for the maintenance of the filling material.

[0004] To solve such problems, unfilled artificial turf applying shock absorption pads has been developed and used without using particulate filling materials. However, in the case of shock absorption pads, there are fatal drawbacks such as permanent compression and low recovery rate due to repeated loads. Also, due to long-term use, there is a drawback that the dimensional stability in the width, length, and thickness directions of the shock absorption pad is vulnerable.

[0005] Therefore, in order to solve such problems, it is necessary to develop an unfilled artificial turf structure with excellent cushioning properties.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The problem to be solved by the present invention is to provide an artificial turf structure that maintains a long-term buffering force and exhibits excellent shock absorption ability without using a filling material.

Means for Solving the Problems

[0007] The present invention relates to an artificial turf structure including a protective layer; a buffer layer located on the lower surface of the protective layer and having a three-dimensional structure including a surface layer, an intermediate layer, and a back surface layer; a bubble layer located on the lower surface of the buffer layer; a pile portion tufted on the protective layer, the buffer layer, and the bubble layer; and a backing layer located on the lower surface of the bubble layer and preventing the detachment of the pile portion.

[0008] In the present invention, the protective layer is in the form of a woven fabric, a non-woven fabric, or a film, and the thickness can be 0.2 to 3.5 mm.

[0009] In the present invention, the surface layer and the back surface layer can be formed of a first raw yarn having a fineness of 120 to 420 denier and a second raw yarn having a fineness of 200 to 800 denier, respectively.

[0010] In the present invention, the surface layer can be composed of a plurality of lattice shapes, and the back surface layer can be composed of a plurality of honeycomb shapes.

[0011] In the present invention, the plurality of lattice shapes are 120,000 to 200,000 per 1 m 2 and the plurality of honeycomb shapes can be 35,000 to 60,000 per 1 m 2

[0012] In the present invention, the intermediate layer connects the surface layer and the back surface layer and can be formed of a third raw yarn having a fineness of 180 to 800 denier.

[0013] In the present invention, the thickness of the buffer layer can be 5 to 20 mm.

[0014] In the present invention, the pile portion includes a first pile yarn and a second pile yarn, and the first pile yarn and the second pile yarn can be tufted in a state of overlapping each other.

[0015] ​In the present invention, the length of the pile portion exposed on the surface of the protective layer can be 10 to 60 mm.

Advantages of the Invention

[0016] The artificial turf structure according to the present invention includes a protective layer, thereby preventing foreign matter from flowing into the buffer layer and maintaining high shock absorption performance of the artificial turf structure for a long period of time.

[0017] In addition, the surface layer and the back layer of the buffer layer can exhibit improved shock absorption ability by having specific shapes respectively.

[0018] In addition, the filaments constituting the surface layer, the intermediate layer and the back layer can exhibit improved shock absorption ability by having specific fineness.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0020] Hereinafter, the embodiments, examples, etc. of the present invention will be described in more detail with reference to those which can be easily implemented by those having ordinary knowledge in the technical field of the present invention. However, the present invention can be implemented in various forms and is not limited to the embodiments, examples, etc. described in this specification.

[0021] In the present invention, when the terms "about", "approximately", or similar expressions such as "at least" are used with respect to a numerical value, a theoretical, experimental, statistical, or empirical error of ±10%, ±7%, ±5%, ±3%, ±2%, or ±1% is intended to be allowed based on that numerical value.

[0022] FIG. 1 is a view showing an artificial turf structure according to the present invention. Referring to FIG. 1, the artificial turf structure according to an embodiment of the present invention includes a protective layer; a buffer layer located on the lower surface of the protective layer and having a three-dimensional structure including a surface layer, an intermediate layer, and a back surface layer; a bubble layer located on the lower surface of the buffer layer; a pile portion tufted to the protective layer, the buffer layer, and the bubble layer; and a backing layer located on the lower surface of the bubble layer and preventing the detachment of the pile portion.

[0023] In the present invention, the protective layer 110 can be in the form of a woven fabric, a non-woven fabric, or a film as a layer for preventing foreign substances from flowing into the buffer layer 120, and preferably can be in the form of a woven fabric. Further, the protective layer can contain a UV stabilizer or the like according to the application.

[0024] Also, the thickness of the protective layer 110 can be 0.2 to 3.5 mm, preferably 0.4 to 2.5 mm, and more preferably about 1.25 mm. If the thickness of the protective layer 110 is less than the aforementioned lower limit value, it is not easy to prevent foreign substances from flowing into the buffer layer 120, and if it exceeds the aforementioned upper limit value, tufting of the pile portion may not be easy.

[0025] FIG. 2 is a view showing the buffer layer of FIG. 1, FIG. 3 is an actual photograph of the surface layer of the buffer layer according to the present invention, and FIG. 4 is an actual photograph of the back surface 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 surface layer 123, and by having a three-dimensional structure having a space inside, the elastic recovery force and drainage property of the artificial turf structure 100 can be improved.

[0027] In the present invention, the buffer layer 120 is a layer for improving the shock absorption ability of the artificial turf structure 100, and can be manufactured from one or more fibers selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyamide, polyethylene, polypropylene, and acrylic.

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

[0029] In the present invention, the thickness of the buffer layer 120 can be 5 to 20 mm, preferably 8 to 12 mm. Since it is excellent in shock absorption ability, durability, etc. within the above range, the above range is preferable.

[0030] Referring to FIG. 3, in the present invention, the surface layer 121 is located under the protective layer 110 and is a layer for protecting the intermediate layer 122 from being damaged by an external force. The surface layer 121 can be formed of a first filament having a fineness of 120 to 420 denier and a second filament having a fineness of 200 to 800 denier, and preferably, a first filament having a fineness of 150 to 400 denier and a second filament having a fineness of 250 to 750 denier. If the fineness of the first and second filaments forming the surface layer 121 is less than the above-mentioned lower limit value, the surface layer 121 and the back layer 123 may be damaged during tufting. If it exceeds the above-mentioned upper limit value, tufting of the pile portion 140 is not easy and the workability may decrease.

[0031] Further, the surface layer 121 can contain 30 to 70% by weight of the first raw yarn and 30 to 70% by weight of the second raw yarn, and preferably can contain 45 to 55% by weight of the first raw yarn and 45 to 55% by weight of the first raw yarn. If the weight percentage of the first raw yarn is less than the aforementioned lower limit value, the surface layer 121 and the back surface layer 123 may be damaged during tufting. If it exceeds the aforementioned upper limit value, tufting of the pile portion 140 is not easy and the workability may decrease.

[0032] In the present invention, the surface layer 121 can be composed of a plurality of lattice shapes, and the lattice shapes are 1 m 2 There can be 120,000 to 200,000 per square meter, and preferably 137,000 to 165,000 per square meter. If the number of lattice shapes is less than the aforementioned lower limit value per square meter, the durability of the buffer layer 120 may decrease. If it exceeds the aforementioned upper limit value per square meter, tufting of the pile portion 140 is not easy and the shock absorption ability of the buffer layer 120 may decrease. 2 There can be 137,000 to 165,000 per square meter. If the number of lattice shapes is less than the aforementioned lower limit value per square meter, the durability of the buffer layer 120 may decrease. If it exceeds the aforementioned upper limit value per square meter, tufting of the pile portion 140 is not easy and the shock absorption ability of the buffer layer 120 may decrease. 2 If it is less than the aforementioned lower limit value per square meter, the durability of the buffer layer 120 may decrease. If it exceeds the aforementioned upper limit value per square meter, tufting of the pile portion 140 is not easy and the shock absorption ability of the buffer layer 120 may decrease. 2 If it exceeds the aforementioned upper limit value per square meter, tufting of the pile portion 140 is not easy and the shock absorption ability of the buffer layer 120 may decrease.

[0033] Referring to FIG. 4, in the present invention, the back surface layer 123 is a layer that protects the intermediate layer 122 from being damaged by an external force. The back surface layer 123 can be formed of a first raw yarn having a fineness of 120 to 420 denier and a second raw yarn having a fineness of 200 to 800 denier, and preferably can be formed of a first raw yarn having a fineness of 150 to 400 denier and a second raw yarn having a fineness of 250 to 750 denier. If the fineness of the first raw yarn and the second raw yarn forming the back surface layer 123 is less than the aforementioned lower limit value, the surface layer 121 and the back surface layer 123 may be damaged during tufting. If it exceeds the aforementioned upper limit value, tufting of the pile portion 140 is not easy and the workability may decrease.

[0034] Further, the back layer 123 can contain 30 to 70% by weight of the first raw yarn and 30 to 70% by weight of the second raw yarn, and preferably can contain 45 to 55% by weight of the first raw yarn and 45 to 55% by weight of the first raw yarn. If the weight percentage of the first raw yarn is less than the above-mentioned lower limit, the surface layer 121 and the back layer 123 may be damaged during tufting. If it exceeds the above-mentioned upper limit, the tufting of the pile portion 140 is not easy, and the workability may decrease.

[0035] In the present invention, the back layer 123 can be composed of a plurality of honeycomb shapes, and the honeycomb shape is 1 m 2 There can be 35,000 to 60,000 per square meter, and preferably 40,000 to 55,600 per square meter. If the number of honeycomb shapes is less than the above-mentioned lower limit per square meter, the durability of the buffer layer 120 may decrease. If it exceeds the above-mentioned upper limit per square meter, the tufting of the pile portion 140 is not easy, and the impact absorption ability of the buffer layer 120 may decrease. 2 When the number of honeycomb shapes per square meter is less than the above-mentioned lower limit, the durability of the buffer layer 120 may decrease. When it exceeds the above-mentioned upper limit per square meter, the tufting of the pile portion 140 is not easy, and the impact absorption ability of the buffer layer 120 may decrease. 2 When the number of honeycomb shapes per square meter is less than the above-mentioned lower limit, the durability of the buffer layer 120 may decrease. If it exceeds the above-mentioned upper limit per square meter, the tufting of the pile portion 140 is not easy, and the impact absorption ability of the buffer layer 120 may decrease. 2 If it exceeds the above-mentioned upper limit per square meter, the tufting of the pile portion 140 is not easy, and the impact absorption ability of the buffer layer 120 may decrease.

[0036] In the present invention, by manufacturing the surface layer 121 in a lattice shape and the back layer 123 in a honeycomb shape, the artificial turf structure 100 according to the present invention can satisfy an impact absorption rate of 50% or more and a vertical deformation of 3 to 10 mm, which is the KS standard.

[0037] In the present invention, the intermediate layer 122 is disposed between the surface layer 121 and the back layer 123, connects the surface layer 121 and the back layer 123, and is a layer that improves the impact absorption ability of the buffer layer 120. The intermediate layer 122 can be formed of a third raw yarn having a fineness of 180 to 800 denier, and preferably can be formed of a third raw yarn having a fineness of 210 to 750 denier. The third raw yarn can be a monofilament. If the third raw yarn forming the intermediate layer 122 is less than the above-mentioned lower limit, the permanent compression rate may decrease. If it exceeds the above-mentioned upper limit, the tufting of the pile portion 140 is not easy, and the workability may decrease.

[0038] In the present invention, the connection between the surface layer 121 and the back surface layer 123 can be such that both ends of the third raw yarn are connected to the surface layer 121 and the back surface layer 123 in a regular or irregular manner by straight lines or diagonal lines, and the third raw yarns can be laminated and connected.

[0039] In the present invention, a commercially available 3D spacer fabric product can be applied to the buffer layer 120.

[0040] In the present invention, the bubble layer 130 can be located on the lower surface of the back surface layer 123, and serves to give the artificial turf structure 100 morphological stability and firmly seat and fix the pile portion 140. It can be a woven or non-woven fabric of one or more fibers selected from the group consisting of polyolefin, polyethylene terephthalate, polyvinylidene chloride, and nylon. Preferably, it may be a polyethylene terephthalate non-woven fabric, and the non-woven fabric can be manufactured by any one method selected from the group consisting of the spunbond method, the meltblown method, the needle punching method, and the spunlace method.

[0041] In the present invention, the pile portion 140 can be composed of a plurality of pile yarns, can be tufted to the protective layer 110, the buffer layer 120, and the bubble layer 130, and the tufted pile portion 140 can penetrate through the bubble layer 130, the buffer layer 120, and the protective layer 110 and be exposed on the surface of the protective layer 110.

[0042] The length of the exposed pile portion 140 can be 10 to 60 mm, preferably 30 to 55 mm. If the length of the exposed pile portion is less than the above-mentioned lower limit value, the impact absorption ability of the artificial turf structure 100 may decrease, and if it exceeds the above-mentioned upper limit value, it may be difficult to maintain morphological stability.

[0043] In the present disclosure, the fineness of the plurality of pile yarns can be 500 to 3,000 denier, preferably 650 to 2,700 denier, and the pile yarn can be monosal. The material of the pile yarn can be one or more selected from the group consisting of polyethylene, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate.

[0044] In the present invention, the backing layer 150 can be located on the lower surface of the bubble layer 130, and is a layer for preventing the pile yarn from detaching, and can be a woven fabric or a non-woven fabric of one or more fibers selected from the group consisting of polyolefin, polyethylene terephthalate, polyvinylidene chloride, and nylon. Preferably, it may be a polyethylene terephthalate non-woven fabric, and the non-woven fabric can be manufactured by any one method selected from the group consisting of the spunbond method, the meltblown method, the needle punching method, and the spunlace method.

[0045] The artificial turf structure 100 according to another embodiment of the present invention includes a protective layer 110; a buffer layer 220 having a three-dimensional structure located on the lower surface of the protective layer 110 and including a surface layer 221, an intermediate layer 222, and a back layer 223; a bubble layer 130 located on the lower surface of the buffer layer 220; a pile portion 140 tufted to the protective layer 110, the buffer layer 220, and the bubble layer 130; and a backing layer 150 located on the lower surface of the bubble layer 130 for preventing the detachment of the pile portion 140.

[0046] Except for the content described below, the content regarding the protective layer 110, the surface layer 221, the intermediate layer 222, and the back layer 223, the bubble layer 130, the pile portion 140, and the backing layer 150 is the same as that of the protective layer 110, the surface layer 121, the intermediate layer 122, and the back layer 123, the bubble layer 130, the pile portion 140, and the backing layer 150 described above.

[0047] In the present invention, the buffer layer 220 is impregnated with an elastic material and is superior in shock absorption and durability to a buffer layer not impregnated with the elastic material. The elastic material may be at least one selected from the group consisting of polyurethane resin, polyvinyl acetate resin, styrene-based polymer resin, natural rubber, EPDM (Ethylene-Propylene Diene Monomer) rubber, acrylic rubber, butyl rubber, and silicone rubber, and may preferably be polyurethane resin.

[0048] Specifically, the styrene-based polymer resin may be at least one selected from the group consisting of styrene-ethylene-butadiene-styrene copolymer, styrene-butadiene-styrene copolymer, styrene-ethylene-propylene-styrene copolymer, hydrogenated styrene-isoprene-butadiene copolymer, and styrene-isoprene-styrene copolymer.

[0049] The acrylic rubber may be a polymer of monomers selected from the group consisting of methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, hexyl methacrylate, 2-ethylhexyl methacrylate, and mixtures thereof.

[0050] The butyl rubber may be a copolymer of isobutylene and isoprene (IIR), bromobutyl rubber, or the like.

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

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

[0053]

Equation

[0054] In the present invention, if the content of the elastic material included in the buffer layer 220 is less than the above-described lower limit value, the degree of improvement in shock absorption is not large. If it exceeds the above-described upper limit value, tufting is not easy, the voids of the buffer layer 220 excessively decrease, and the degree of improvement in shock absorption is not large compared to the elastic material content. Therefore, the above range is preferable.

[0055] In the present invention, the density of the surface layer 221 can be 0.05 to 0.4 g / cm 3 and the density of the intermediate layer 222 can be 0.01 to 0.1 g / cm 3 and the density of the back surface layer 223 can be 0.1 to 0.4 g / cm 3 Preferably, the density of the surface layer 221 can be 0.1 to 0.3 g / cm 3 and the density of the intermediate layer 222 can be 0.02 to 0.05 g / cm 3 and the density of the back surface layer 223 can be 0.1 to 0.3 g / cm 3 If the densities of the surface layer 221, the intermediate layer 222, and the back surface layer 223 are less than the above-described lower limit values, the shock absorption may decrease. If they exceed the above-described upper limit values, tufting of the pile yarn is not easy and impregnation of the elastic material may be difficult.

[0056] An artificial turf structure 100 according to another embodiment of the present invention includes a protective layer 110; a buffer layer 320 having a three-dimensional structure including a surface layer 321, an intermediate layer 322, and a back surface layer 323, which is located on the lower surface of the protective layer 110; a bubble layer 130 located on the lower surface of the buffer layer 320; a pile portion 140 tufted to the protective layer 110, the buffer layer 320, and the bubble layer 130; and a backing layer 150 located on the lower surface of the bubble layer 130 to prevent detachment of the pile portion 140. The buffer layer 320 can be manufactured through a step of manufacturing the buffer layer 320 having a three-dimensional structure; and a step of heating the buffer layer 320.

[0057] Except for the content described below, the content regarding the protective layer 110, the surface layer 321, the intermediate layer 322, the back surface layer 323, the bubble layer 130, the pile portion 140, and the backing layer 150 is the same as that of the protective layer 110, the surface layer 121, the intermediate layer 122, the back surface layer 123, the bubble layer 130, the pile portion 140, and the backing layer 150 described above.

[0058] In the present invention, the buffer layer 320 can be manufactured through the steps of manufacturing the buffer layer 320 having a three-dimensional structure; and heating the buffer layer 320. The step of heating the buffer layer 320 can proceed at a temperature of 130 to 170°C at a speed of 2 to 5 m / min for 5 to 60 seconds, preferably at a temperature of 140 to 160°C at a speed of 2.5 to 4 m / min for 10 to 30 seconds. In the heating step, if the temperature is less than 130°C, the fixing of the buffer layer 320 may be insufficient and the elastic recovery force may decrease. If it exceeds 170°C, although the elastic recovery force is excellent, the manufacturing cost and the like may be high and the production efficiency may decrease.

[0059] Also, if the speed is less than 2 m / min, the elastic recovery force is excellent, but the production efficiency decreases. If it exceeds 5 m / min, the fixing of the buffer layer 320 may be insufficient and the elastic recovery force may decrease. Further, if the heating time is less than 5 seconds, the fixing of the buffer layer 320 may be insufficient and the elastic recovery force may decrease. If it exceeds 60 seconds, although the elastic recovery force is excellent, the manufacturing cost and the like may be high and the production efficiency may decrease.

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

[0061] In the present invention, the weight per unit area of the surface layer 321 can be 150 to 450 g / m 2 and the weight per unit area of the intermediate layer 322 can be 1,700 to 2,300 g / m 2It can be, and the weight per unit area of the back layer 323 can be 300 to 600 g. Preferably, the weight per unit area of the surface layer 321 is 200 to 400 g / m 2 It can be, and the weight per unit area of the intermediate layer 322 can be 1,900 to 2,100 g / m 2 It can be, and the weight per unit area of the back layer 323 can be 400 to 500 g / m 2 It can be. If the weights per unit area of the surface layer 321, the intermediate layer 322, and the back layer 323 are each less than 150 g / m 2 , 1,700 g / m 2 and 300 g / m 2 respectively, the elastic recovery force may decrease. If they exceed 450 g / m 2 , 2,300 g / m 2 and 600 g / m 2 respectively, the shock absorption rate may decrease.

[0062] A method for manufacturing the artificial turf structure 100 according to another embodiment of the present invention includes: a) manufacturing a buffer layer 320 having a three-dimensional structure; b) heating the buffer layer 320 at a temperature of 130 to 170°C at a speed of 2 to 5 m / min for 10 to 30 seconds; c) after positioning the protective layer 110, the buffer layer 320, and the bubble layer 130, tufting the pile portion 140; d) positioning a backing layer 150 on the lower surface of the bubble layer 140 and heating it at a temperature of 140 to 180°C at a speed of 2 to 5 m / min for 5 to 60 seconds.

[0063] Except for the content described below, the content regarding the protective layer 110, the surface layer 321, the intermediate layer 322, and the back layer 323, the bubble layer 130, the pile portion 140, and the backing layer 150 is the same as that of the protective layer 110, the surface layer 121, the intermediate layer 122, and the back layer 123, the bubble layer 130, the pile portion 140, and the backing layer 150 described above.

[0064] Step a) is the step of manufacturing the buffer layer 320 having a three-dimensional structure, and step b) is the step of heating and fixing the manufactured buffer layer 320 having a three-dimensional structure to manufacture the buffer layer 320. The heating in step b) can preferably be carried out using a Stame Dryer, and the heating conditions are 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. Specifically, it means the time difference between when one end of the buffer 320 enters and exits the heating device.

[0066] Also, step c) is the step of positioning the protective layer 110, the buffer layer 320, and the bubble layer 130 and tufting the pile portion 140, and the tufting can be used without limitation in a manner well-known in the art.

[0067] Step d) is the step of positioning the backing layer 150 on the lower surface of the bubble layer 130, then heating to thermally bond the pile portion 140, secondarily fix the buffer layer 320, and improve the elastic recovery force of the buffer layer 320.

[0068] The heating in step d) can be carried out at a temperature of 140 to 180°C at a speed of 2 to 5 m / min for 5 to 60 seconds. Preferably, it can be carried out at a temperature of 150 to 170°C at a speed of 2.5 to 4 m / min for 10 to 30 seconds. If the temperature is less than 140°C, the speed is less than 2 m / min, or the heating time is less than 5 seconds, the fusion of the pile portion 140 is insufficient, the pulling strength decreases, the fixing of the buffer layer 320 is insufficient, and the elastic recovery force of the industrial structure 100 may decrease. If the temperature exceeds 180°C, exceeds 5 m / min, or exceeds 60 seconds, the elastic recovery force is excellent, but the pile portion 140 is over-fused and the morphological stability decreases. Therefore, the first raw yarn, the second raw yarn, the third raw yarn, and the pile portion may melt and the appearance quality may decrease.

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

[0070] Hereinafter, specific examples according to the present invention will be given for explanation.

[0071] Buffer layer manufacturing example 1 Using a double raschel machine, a three-dimensional structure with a thickness of 10 mm composed of a surface layer, an intermediate layer, and a back layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back layer were 2 mm, 6 mm, and 2 mm, respectively. The surface layer and the back layer were each composed of 50% by weight of 150-denier polyethylene terephthalate first raw yarn and 50% by weight of 250-denier polyethylene terephthalate second raw yarn, and the intermediate layer was composed of 210-denier polyethylene terephthalate third raw yarn (monofilament). The surface layer was formed in a lattice shape of about 160,000 per 1 m 2 and the back layer was formed in a honeycomb shape of about 54,500 per 1 m. 2

[0072] Buffer layer manufacturing example 2 In Buffer Layer Manufacturing Example 1, a buffer layer was manufactured in the same manner as in Buffer Layer Manufacturing Example 1, except that the denier of the polyethylene terephthalate second raw yarn constituting the surface layer and the back layer was changed to 300.

[0073] Buffer layer manufacturing example 3 In Buffer Layer Manufacturing Example 1, a buffer layer was manufactured in the same manner as in Buffer Layer Manufacturing Example 1, except that the denier of the polyethylene terephthalate second raw yarn constituting the surface layer and the back layer was changed to 750.

[0074] Buffer layer manufacturing example 4 In Buffer Layer Manufacturing Example 1, a buffer layer was manufactured in the same manner as in Buffer Layer Manufacturing Example 1, except that the denier of the polyethylene terephthalate first raw yarn constituting the surface layer and the back layer was changed to 400.

[0075] Buffer layer manufacturing example 5 ​ In Production Example 1 of the buffer layer, a buffer layer was produced in the same manner as in Production Example 1 of the buffer layer, except that the denier of the first polyethylene terephthalate yarn constituting the surface layer and the back surface layer was changed to 400, and the denier of the second polyethylene terephthalate yarn was changed to 300.

[0076] Buffer layer manufacturing example 6 In Production Example 1 of the buffer layer, a buffer layer was produced in the same manner as in Production Example 1 of the buffer layer, except that the denier of the first polyethylene terephthalate yarn constituting the surface layer and the back surface layer was changed to 400, and the denier of the second polyethylene terephthalate yarn was changed to 750.

[0077] Buffer layer manufacturing example 7 In Production Example 1 of the buffer layer, a buffer layer was produced in the same manner as in Production Example 1 of the buffer layer, except that the denier of the first polyethylene terephthalate yarn constituting the surface layer and the back surface layer was changed to 400, the denier of the second polyethylene terephthalate yarn was changed to 750, and the denier of the third polyethylene terephthalate yarn (monofilament) constituting the intermediate layer was changed to 450.

[0078] Buffer layer manufacturing example 8 In Production Example 1 of the buffer layer, a buffer layer was produced in the same manner as in Production Example 1 of the buffer layer, except that the denier of the first polyethylene terephthalate yarn constituting the surface layer and the back surface layer was changed to 400, the denier of the second polyethylene terephthalate yarn was changed to 750, and the denier of the third polyethylene terephthalate yarn (monofilament) constituting the intermediate layer was changed to 750.

[0079] Buffer layer manufacturing example 9 Using a double raschel machine, a three-dimensional structure with a thickness of about 10 mm composed of a surface layer, an intermediate layer, and a back surface layer was produced. The thicknesses of the surface layer, the intermediate layer, and the back surface layer were 1 mm, 8 mm, and 1 mm, respectively.

[0080] The surface layer and the back layer are each composed of 50% by weight of polyethylene terephthalate fibers of about 150 denier and 50% by weight of polyethylene terephthalate fibers of about 250 denier, and the intermediate layer is composed of polyethylene terephthalate fibers (monofilaments) with a diameter of about 0.27 mm. The surface layer is formed in a lattice pattern of about 160,000 per 1 m 2 and the back layer is formed in a structure including a honeycomb shape of about 47,500 per 1 m 2 . Also, the densities of the surface layer, the intermediate layer, and the back layer are about 0.22 g / cm 3 , about 0.025 g / cm 3 , and about 0.22 g / cm 3 , respectively.

[0081] After impregnating the manufactured three-dimensional structure with a polyurethane resin, it was dried at 80 to 100 °C for about 2 hours. The content of the elastic material calculated by the following Mathematical Formula 1 is about 30% by weight.

[0082]

Equation

[0083] Buffer layer manufacturing example 10 Using a double raschel machine, a three-dimensional structure with a thickness of about 10 mm composed of a surface layer, an intermediate layer, and a back layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back layer were 1 mm, 8 mm, and 1 mm, respectively.

[0084] The surface layer and the back layer are each composed of 50% by weight of polyethylene terephthalate fibers of about 150 denier and 50% by weight of polyethylene terephthalate fibers of about 250 denier, and the intermediate layer is composed of polyethylene terephthalate fibers (monofilaments) with a diameter of about 0.27 mm. The surface layer is formed in a lattice pattern of about 160,000 per 1 m 2 and the back layer is formed in a structure including a honeycomb shape of about 47,500 per 1 m 2 . Also, the densities of the surface layer, the intermediate layer, and the back layer are about 0.22 g / cm 3 , about 0.025 g / cm 3 , and about 0.22 g / cm3 It was.

[0085] After impregnating the manufactured three-dimensional structure with a polyurethane resin, it was dried at 80 to 100 °C for about 2 hours. The content of the elastic material calculated by the above mathematical formula 1 is about 10% by weight.

[0086] Buffer layer manufacturing example 11 Using a double raschel machine, a three-dimensional structure with a thickness of about 10 mm composed of a surface layer, an intermediate layer, and a back layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back layer were 1 mm, 8 mm, and 1 mm, respectively.

[0087] The surface layer and the back layer were each composed of 50% by weight of polyethylene terephthalate fibers of about 150 denier and 50% by weight of polyethylene terephthalate fibers of about 250 denier, and the intermediate layer was composed of polyethylene terephthalate fibers (monofilaments) with a diameter of about 0.27 mm. The surface layer was formed in a lattice pattern of about 160,000 per 1 m 2 and the back layer was formed in a structure including a honeycomb shape of about 47,500 per 1 m 2 . Also, the densities of the surface layer, the intermediate layer, and the back layer were about 0.22 g / cm 3 , about 0.025 g / cm 3 and about 0.22 g / cm 3 respectively.

[0088] After impregnating the manufactured three-dimensional structure with a polyurethane resin, it was dried at 80 to 100 °C for about 2 hours. The content of the elastic material calculated by the above mathematical formula 1 is about 50% by weight.

[0089] Buffer layer manufacturing example 12 Using a double raschel machine, a three-dimensional structure with a thickness of about 10 mm composed of a surface layer, an intermediate layer, and a back layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back layer were 1 mm, 8 mm, and 1 mm, respectively.

[0090] The surface layer and the back layer were each composed of 50% by weight of polyethylene terephthalate fibers of about 150 denier and 50% by weight of polyethylene terephthalate fibers of about 250 denier, and the intermediate layer was composed of polyethylene terephthalate fibers (monofilaments) with a diameter of about 0.27 mm. The surface layer was formed in a lattice pattern of about 160,000 per 1 m 2 and the back layer was formed in a structure including a honeycomb shape of about 47,500 per 1 m 2 . Also, the densities of the surface layer, the intermediate layer, and the back layer were about 0.05 g / cm 3 , about 0.01 g / cm 3 and about 0.05 g / cm 3 , respectively.

[0091] After impregnating the manufactured three-dimensional structure with a polyurethane resin, it was dried at 80 to 100 °C for about 2 hours. The content of the elastic material calculated by the above mathematical formula 1 was about 30% by weight.

[0092] Buffer layer manufacturing example 13 Using a double raschel machine, a three-dimensional structure with a thickness of about 10 mm composed of a surface layer, an intermediate layer, and a back layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back layer were 1 mm, 8 mm, and 1 mm, respectively.

[0093] The surface layer and the back layer were each composed of 50% by weight of polyethylene terephthalate fibers of about 150 denier and 50% by weight of polyethylene terephthalate fibers of about 250 denier, and the intermediate layer was composed of polyethylene terephthalate fibers (monofilaments) with a diameter of about 0.27 mm. The surface layer was formed in a lattice pattern of about 160,000 per 1 m 2 and the back layer was formed in a structure including a honeycomb shape of about 47,500 per 1 m 2 . Also, the densities of the surface layer, the intermediate layer, and the back layer were about 0.4 g / cm 3 , about 0.1 g / cm 3 and about 0.4 g / cm 3 , respectively.

[0094] After impregnating the manufactured three-dimensional structure with a polyurethane resin, it was dried at 80 to 100 °C for about 2 hours. The content of the elastic material calculated by the above mathematical formula 1 is about 30% by weight.

[0095] Buffer layer manufacturing example 14 Using a double raschel machine, a three-dimensional structure with a thickness of about 10 mm composed of a surface layer, an intermediate layer, and a back layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back layer were 1 mm, 8 mm, and 1 mm, respectively. The manufactured three-dimensional structure was heated at about 150 °C at a speed of about 3 m / min for 20 seconds using a Stame Dryer to manufacture a buffer layer.

[0096] The surface layer and the back layer were each composed of 50% by weight of 150-denier polyethylene terephthalate first raw yarn and 50% by weight of 250-denier polyethylene terephthalate second raw yarn, and the intermediate layer was composed of polyethylene terephthalate raw yarn (monofilament) with a diameter of 0.27 mm. The surface layer was formed in a lattice shape of about 160,000 per 1 m 2 and the back layer was formed in a honeycomb shape of about 47,500 per 1 m 2 Also, the weights per unit area of the surface layer, the intermediate layer, and the back layer were about 300 g / m 2 about 2,000 g / m 2 and about 450 g / m 2 respectively.

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

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

[0099] Buffer layer comparative manufacturing example 1 In Buffer Layer Production Example 1, a buffer layer was produced in the same manner as in Buffer Layer Production Example 1, except that the denier of the first polyethylene terephthalate filament forming the surface layer and the back surface layer was changed to 100.

[0100] Buffer layer comparative manufacturing example 2 In Buffer Layer Production Example 1, a buffer layer was produced in the same manner as in Buffer Layer Production Example 1, except that the denier of the first polyethylene terephthalate filament forming the surface layer and the back surface layer was changed to 100, and the denier of the second polyethylene terephthalate filament was changed to 300.

[0101] Buffer layer comparative manufacturing example 3 In Buffer Layer Production Example 1, a buffer layer was produced in the same manner as in Buffer Layer Production Example 1, except that the denier of the first polyethylene terephthalate filament forming the surface layer and the back surface layer was changed to 100, and the denier of the second polyethylene terephthalate filament was changed to 750.

[0102] Buffer layer comparative manufacturing example 4 In Buffer Layer Production Example 1, a buffer layer was produced in the same manner as in Buffer Layer Production Example 1, except that the denier of the first polyethylene terephthalate filament forming the surface layer and the back surface layer was changed to 450.

[0103] Buffer layer comparative manufacturing example 5 In Buffer Layer Production Example 1, a buffer layer was produced in the same manner as in Buffer Layer Production Example 1, except that the denier of the first polyethylene terephthalate filament forming the surface layer and the back surface layer was changed to 450, and the denier of the second polyethylene terephthalate filament was changed to 300.

[0104] Buffer layer comparative manufacturing example 6 In Buffer Layer Production Example 1, a buffer layer was produced in the same manner as in Buffer Layer Production Example 1, except that the denier of the first polyethylene terephthalate filament forming the surface layer and the back surface layer was changed to 450, and the denier of the second polyethylene terephthalate filament was changed to 750.

[0105] Buffer layer comparative manufacturing example 7 In Buffer Layer Manufacturing Example 1, the buffer layer was manufactured in the same manner as in Buffer Layer Manufacturing Example 1, except that the denier of the first polyethylene terephthalate yarn constituting the surface layer and the back surface layer was changed to 400, the denier of the second polyethylene terephthalate yarn was changed to 750, and the denier of the third polyethylene terephthalate yarn (monofilament) constituting the intermediate layer was changed to 150.

[0106] Buffer layer comparative manufacturing example 8 In Buffer Layer Manufacturing Example 8, the buffer layer was manufactured in the same manner as in Buffer Layer Manufacturing Example 8, except that the shapes of the surface layer and the back surface layer were entirely formed in a lattice pattern.

[0107] Buffer layer comparative manufacturing example 9 In Buffer Layer Manufacturing Example 8, the buffer layer was manufactured in the same manner as in Buffer Layer Manufacturing Example 8, except that the shapes of the surface layer and the back surface layer were entirely formed in a honeycomb pattern.

[0108] Buffer layer comparative manufacturing example 10 Using a double raschel machine, a three-dimensional structure with a thickness of approximately 10 mm composed of a surface layer, an intermediate layer, and a back surface layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back surface layer were 1 mm, 8 mm, and 1 mm, respectively.

[0109] The surface layer and the back surface layer were each composed of 50% by weight of polyethylene terephthalate fibers with a denier of approximately 150 and 50% by weight of polyethylene terephthalate fibers with a denier of approximately 250, and the intermediate layer was composed of polyethylene terephthalate fibers (monofilaments) with a diameter of approximately 0.27 mm. The surface layer was formed in a lattice pattern with approximately 160,000 per square meter, and the back surface layer was formed in a structure including approximately 47,500 honeycomb shapes per square meter. Also, the densities of the surface layer, the intermediate layer, and the back surface layer were approximately 0.22 g / cm 2 , approximately 47,500 honeycomb shapes per square meter for the back surface layer. Also, the densities of the surface layer, intermediate layer, and back surface layer were approximately 0.22 g / cm 2 , approximately 0.025 g / cm 3 , and approximately 0.22 g / cm 3 , respectively. 3 respectively.

[0110] Buffer layer comparative manufacturing example 11 Using a double raschel machine, a three-dimensional structure with a thickness of about 10 mm composed of a surface layer, an intermediate layer, and a back layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back layer were 1 mm, 8 mm, and 1 mm, respectively.

[0111] The surface layer and the back layer were each composed of 50% by weight of polyethylene terephthalate fibers of about 150 denier and 50% by weight of polyethylene terephthalate fibers of about 250 denier, and the intermediate layer was composed of polyethylene terephthalate fibers (monofilaments) with a diameter of about 0.27 mm. The surface layer was formed in a lattice pattern of about 160,000 per 1 m 2 and the back layer was formed in a structure including a honeycomb shape of about 47,500 per 1 m 2 . Also, the densities of the surface layer, the intermediate layer, and the back layer were about 0.22 g / cm 3 , about 0.025 g / cm 3 and about 0.22 g / cm 3 , respectively.

[0112] After impregnating the manufactured three-dimensional structure with a polyurethane resin, it was dried at 80 to 100 °C for about 2 hours. The content of the elastic material calculated by the above mathematical formula 1 was about 5% by weight.

[0113] Buffer layer comparative manufacturing example 12 Using a double raschel machine, a three-dimensional structure with a thickness of about 10 mm composed of a surface layer, an intermediate layer, and a back layer was manufactured. The thicknesses of the surface layer, the intermediate layer, and the back layer were 1 mm, 8 mm, and 1 mm, respectively.

[0114] The surface layer and the back layer were each composed of 50% by weight of polyethylene terephthalate fibers of about 150 denier and 50% by weight of polyethylene terephthalate fibers of about 250 denier, and the intermediate layer was composed of polyethylene terephthalate fibers (monofilaments) with a diameter of about 0.27 mm. The surface layer was formed in a lattice pattern of about 160,000 per 1 m 2 and the back layer was formed in a structure including a honeycomb shape of about 47,500 per 1 m 2 . Also, the densities of the surface layer, the intermediate layer, and the back layer were about 0.22 g / cm 3, about 0.025 g / cm 3 and about 0.22 g / cm 3 was the case.

[0115] After impregnating the produced three-dimensional structure with a polyurethane resin, it was dried at 80 to 100 °C for about 2 hours. The content of the elastic material calculated by the above mathematical formula 1 is about 70% by weight.

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

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

[0118] Buffer layer comparative manufacturing example 15 In Buffer Layer Production Example 14, a buffer layer was produced in the same manner as Buffer Layer Production Example 14, except that the heating rate of the three-dimensional structure was changed to about 0.5 m / min.

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

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

[0121] Pile yarn manufacturing example 0.942 g / cm 3100 parts by weight of polyethylene having a density of 220,000, a molecular weight of 220,000, and a molecular weight distribution (Mw / Mn) of 20, 1.25 parts by weight of maleic anhydride as a compatibilizer, 6.25 parts by weight of a pigment, and 0.5 parts by weight of a flame retardant were added to produce a polymer mixture. The produced mixture was heated to produce a mixed melt, and the produced mixed melt was extruded to produce a first pile yarn. The fineness of the pile yarn is about 1,200 denier.

[0122] Table 1 below is a table showing the denier of the first raw yarn, the second raw yarn, and the third raw yarn, and the shapes of the surface layer and the back layer in Production Examples 1 to 8 and Comparative Production Examples 1 to 9 of the buffer layer.

[0123] [Table 1]

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

[0125] Furthermore, a bubble layer and a backing layer were prepared using a polyethylene terephthalate non-woven fabric with a thickness of about 0.75 mm.

[0126] The protective layer, the buffer layer, and the bubble layer were positioned, and the first pile yarn was tufted. Then, the backing layer was positioned on the lower surface of the bubble layer, and heated at about 160 °C for 20 seconds at a speed of about 3 m / min using surface heat fusion equipment to produce an artificial turf structure. The compositions of the protective layer and the buffer layer are shown in Table 2 below.

[0127] [Table 2]

[0128] Experimental example 1 In order to measure the presence or absence of damage to the surface layer and the back layer during tufting according to the denier of the raw yarns constituting the surface layer and the back layer, and the penetration load of the needles during tufting, the artificial turf structures produced in Examples 1 to 6 and Comparative Examples 1 to 6 were measured by the following measurement methods, and the results are shown in Table 3.

[0129] [Measurement method] Presence or absence of damage to the surface layer and the back layer: Visually check for breakage of the raw yarns and changes in the pattern shape. ◎: No change in the raw yarns of the surface layer or the back layer after tufting, no change in the pattern shape. ○: No change in the raw yarns of the surface layer or the back layer after tufting, partial change in the pattern shape. X: Breakage of some of the raw yarns in the surface layer and the back layer after tufting, change in the pattern shape. Penetration load of the needles: Visually check for the presence or absence of slack in the raw yarns. ◎: Continuous operation during tufting is possible without difficulty. ○: Continuous operation during tufting is possible, but additional work for fixing the raw yarns is required due to the deflection of some of the raw yarns. X: Difficult to penetrate the needles during tufting, equipment load occurs.

[0130]

Table 3

[0131] Referring to Table 3 above, when the denier of the first raw yarns constituting the surface layer and the back layer is 100 (Comparative Examples 1 to 3), the surface layer and the back layer are damaged during tufting. When the denier of the first raw yarns constituting the surface layer and the back layer is 450 (Comparative Examples 4 to 6), it can be confirmed that the penetration load during tufting is high and tufting is not easy.

[0132] On the contrary, when the denier of the first raw yarns constituting the surface layer and the back layer is 150 or 400 (Examples 1 to 6), it can be confirmed that there is no damage to the surface layer and the back layer during tufting, the penetration load during tufting is low, and tufting is easy.

[0133] Experimental example 2 To measure the permanent compression ratio based on the denier of the third raw yarn that constitutes the intermediate layer, the artificial turf structures produced in Examples 6 to 8 and Comparative Example 7 were measured by the following measurement method, and the results are shown in Table 4.

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

[0135]

Table 4

[0136] Referring to Table 4 above, when the denier of the third raw yarn (monofilament) that constitutes the intermediate layer is 150 (Comparative Example 7), the permanent compression ratio is 60% or more, which is not good. However, when the denier of the third raw yarn (monofilament) is 210, 450, or 750 (Examples 6 to 8), it can be confirmed that the permanent compression ratio is 45% or less.

[0137] Experimental example 3 To measure the shock absorption rate, vertical deformation, and penetration load according to the forms of the surface layer and the back layer, the artificial turf structures produced in Example 8, Comparative Example 8, and Comparative Example 9 were measured by the following measurement method, and the results are shown in Table 5.

[0138] [Measurement method] Shock absorption rate and vertical deformation: Using a Field Tester device, the shock absorption rate and vertical deformation values of the sample were measured three or more times, and the average value was calculated using the remaining values after excluding the first measurement value. Penetration load of the needle: Visually check whether there is slack in the raw yarn. ◎: Continuous operation during tufting is possible without difficulty. ○: Continuous operation during tufting is possible, but additional work for fixing the raw yarn is required due to the deflection of some raw yarns. X: Penetration of the needle during tufting is difficult, and equipment load occurs.

[0139]

Table 5

[0140] Referring to Table 5, when the forms of the surface layer and the back surface layer are lattice and honeycomb (Example 8), the impact absorption rate is 50% or more, the vertical deformation is 9 mm, meeting the KS standard, and it can be confirmed that the penetration load is low and tufting is easy.

[0141] On the contrary, when the forms of the surface layer and the back surface layer are lattice (Comparative Example 8), the impact absorption rate is 47% and does not meet the KS standard, the penetration load is high, tufting is not easy, and when the forms of the surface layer and the back surface layer are honeycomb (Comparative Example 9), it can be confirmed that the vertical deformation is 13 mm and does not meet the KS standard.

[0142] Experimental example 4 To measure the impact absorption rate, vertical deformation and penetration load depending on the presence or absence of the protective layer, the artificial turf structures manufactured in Example 8 and Comparative Example 10 were measured by the following measurement methods, and the results are shown in Table 6.

[0143] [Measurement Method] Impact absorption rate and vertical deformation: Using a Field Tester device, measure the impact absorption rate and vertical deformation values of the sample three or more times, and calculate the average value using the remaining values after excluding the primary measurement value. Penetration load of the needle: Visually check the presence or absence of the occurrence of yarn sag. ◎: Continuous operation during tufting is possible without difficulty. ○: Continuous operation during tufting is possible, but additional work for fixing the yarn is required due to the sag of some of the yarns. X: Penetration of the needle during tufting is difficult and equipment load occurs.

[0144]

Table 6

[0145] When there is no protective layer (Comparative Example 10), it can be confirmed that the shock absorption rate and the vertical deformation value are decreased compared to the case where the protective layer is included (Example 8).

[0146] Examples 9 to 13 and Comparative Examples 11 to 13 A protective layer was prepared using a polypropylene woven fabric with a thickness of about 0.45 mm. A bubble layer and a backing layer were prepared using a polyethylene terephthalate non-woven fabric with a thickness of about 0.45 mm.

[0147] After positioning the protective layer, the buffer layer, and the bubble layer and tufting the first pile yarn, the backing layer was positioned on the lower surface of the bubble layer, and heated at about 160 °C for 20 seconds at a speed of about 3 m / min using a surface heat fusion facility to manufacture an artificial turf structure. The configuration of the buffer layer is shown in Table 7 below.

[0148]

Table 7

[0149] Experimental example 5 The shock absorption rate and the permanent compression rate of the artificial turf structures manufactured in Examples 9 to 13 and Comparative Examples 11 to 13 were measured by the following measurement methods, and the results are shown in Table 8.

[0150] [Measurement method] Shock absorption rate: Measure the shock absorption property of the mat test piece according to the KS F 3888-1:2022 standard Permanent compression rate: Apply a constant load (1.8 kN) to the sample for about 22 hours, allow it to recover for about 48 hours, and then measure the permanent compression rate due to the change in thickness

[0151]

Table 8

[0152] Referring to Table 8 above, it can be confirmed that when the elastic material is impregnated (Example 9), both the shock absorption rate and the permanent compression rate are superior to the case where the elastic material is not impregnated (Comparative Example 11).

[0153] Regarding the back side and the elastic material content, when it is 10 to 50% by weight (Examples 9 to 11), it can be confirmed that both the impact absorption rate and the permanent compression rate are superior to those in the case of 5% by weight (Comparative Example 12) and 70% by weight (Comparative Example 13).

[0154] Also, when the base material of the buffer layer is a double raschel fabric, the densities of the surface layer, the intermediate layer, and the back surface layer are approximately 0.22 g / cm 3 , approximately 0.025 g / cm 3 and approximately 0.22 g / cm 3 respectively. It can be confirmed that the impact absorption rate and the permanent compression rate in the case of Example 9 are superior to those in the case where they are lower (Example 12) or higher (Example 13) than the above numerical ranges.

[0155] Examples 14 to 16 and Comparative Examples 14 to 19 A protective layer was prepared using a polypropylene woven fabric with a thickness of approximately 0.45 mm. A bubble layer and a backing layer were prepared using a polyethylene terephthalate non-woven fabric with a thickness of approximately 0.45 mm.

[0156] The protective layer, the buffer layer, and the bubble layer were positioned, and after tufting the first pile yarn, the backing layer was positioned on the lower surface of the bubble layer, and heated at approximately 160 °C for 20 seconds at a speed of approximately 3 m / min using surface heat fusion equipment to manufacture an artificial turf structure. The configurations of the protective layer and the buffer layer of the manufactured artificial turf structure are shown in Table 9 below.

[0157]

Table 9

[0158] Comparative example 20 In Example 14, an artificial turf structure was manufactured in the same manner as in Example 14, except that the heating temperature was changed to approximately 100 °C.

[0159] Comparative example 21 In Example 14, an artificial turf structure was manufactured in the same manner as in Example 14, except that the heating temperature was changed to about 200°C.

[0160] Experimental example 6 The shock absorption rate and permanent compression rate of the artificial turf structures manufactured in Examples 14 to 16 and Comparative Examples 14 to 21 were measured by the following measurement methods, and the results are shown in Table 10.

[0161] [Measurement Method] Shock absorption rate: Measure the shock absorption of the mat test piece according to KS F 3888-1:2022 standard Permanent compression rate: Apply a constant load (1.8 kN) to the sample for about 22 hours, let it recover for about 48 hours, and then measure the permanent compression rate based on the change in thickness.

[0162]

Table 10

[0163] Referring to Table 10 above, when the heating temperature of the buffer layer is 130 - 170°C, the heating rate is about 3 m / min, and the heating time is 20 seconds, and the heating temperature of the backing layer is 160°C, the heating rate is about 3 m / min, and the heating time is 20 seconds (Examples 14 to 16), it can be confirmed that the shock absorption rate is 56 - 58% and the permanent compression rate is 23 - 23%, which are very excellent.

[0164] On the contrary, compared with Examples 14 to 16, when the heating temperature of the buffer layer is low (Comparative Example 14), the adhesion of the buffer layer is insufficient, the shock absorption rate is low, and the permanent compression rate is 41%, which is very low. On the other hand, when the heating temperature is high (Comparative Example 15), the adhesion progresses excessively, the shock absorption rate is high, but the permanent compression rate is 38%, which is low. It can be confirmed.

[0165] Also, when the heating temperature of the buffer layer is lower compared to Examples 14 to 16 (Comparative Example 16), the adhesion of the buffer layer progresses excessively, the shock absorption rate is high, but the permanent compression rate is low at 37%, and when the heating temperature is high (Comparative Example 17), it can be confirmed that the adhesion of the buffer layer is insufficient, the shock absorption rate is low, and the permanent compression rate is low at 38%.

[0166] Also, when the buffer layer is not heated compared to Examples 14 to 16 (Comparative Example 18), it can be confirmed that both the shock absorption rate and the permanent compression rate are low.

[0167] Also, when there is no protective layer compared to Examples 14 to 16 (Comparative Example 19), it can be confirmed that silica sand and the filler penetrate into the buffer layer and the shock absorption rate is extremely low.

[0168] Also, when the heating temperature of the backing layer is lower compared to Examples 14 to 16 (Comparative Example 20), the adhesion of the buffer layer is insufficient, the shock absorption rate is low, and when the heating temperature is high (Comparative Example 21), it can be confirmed that the adhesion progresses excessively, the shock absorption rate is high, but the permanent compression rate is low at 39%.

Explanation of Signs

[0169] 100 Artificial turf structure 110 Protective layer 120, 220, 320 Buffer layer 121, 221, 321 Surface layer 122, 222, 322 Intermediate layer 123, 223, 323 Back layer 130 Bubble layer 140 Pile part 150 Backing layer

Claims

1. protective layer; a buffer layer located on the lower surface of the protective layer and having a three-dimensional structure including a surface layer, an intermediate layer, and a back layer; a foam layer located on the lower surface of the cushioning layer; a pile portion tufted on the protective layer, the cushioning layer, and the bubble layer; and a backing layer located on the lower surface of the bubble layer to prevent the pile portion from coming off; The buffer layer is impregnated with an elastic material in an amount of 10 to 50% by weight based on the total weight of the buffer layer, The front layer and the back layer are formed of a first yarn having a fineness of 120 to 420 denier and a second yarn having a fineness of 200 to 800 denier, respectively; The intermediate layer connects the surface layer and the back layer and is formed of a third yarn having a fineness of 180 to 800 denier. Artificial grass structure.

2. 2. The artificial turf structure of claim 1, wherein 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.

3. 2. The artificial turf structure according to claim 1, wherein the surface layer is made of a plurality of lattice shapes, and the back layer is made of a plurality of honeycomb shapes.

4. The plurality of lattice shapes are each 1 m 2 The number of honeycomb shapes is 120,000 to 200,000 per square meter. 2 The artificial turf structure of claim 3, wherein the number of particles per one sieve is 35,000 to 60,000.

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

6. 2. The artificial turf structure according to claim 1, wherein the length of the pile portion exposed above the surface of the protective layer is 10 to 60 mm.

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