Competition mat

Abstract

To propose a mat for competition that ensures stability and safety for competitors, and has durability, ease of handling, and economic efficiency.SOLUTION: A mat for competition comprises: a topmost surface layer; a backmost layer; and a central layer provided with one or more foams and one or more heat-melting layers. The heat-melting layers are composed by heating or pressurizing the foams, and the heat-melting layers are located between the topmost surface layer and the central layer, between the backmost surface layer and the central layer, or between the plurality of foams.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to competition mats, particularly competition mats used in martial arts and combat sports. [Background technology]

[0002] In ancient times, martial arts and combat sports have used tatami mats with a core made of straw or similar material and a surface made of rush grass. In modern times, competition tatami mats have been proposed that incorporate wooden boards, hard cardboard, foam, felt, rigid rubber, honeycomb-structured kraft paper, or combinations of two or more of these as part of the core material (Patent Documents 1 and 2).

[0003] In recent years, reversible competition mats, which are rectangular in shape and have interlocking grooves on their outer surface, have been proposed from the standpoint of ease of installation and storage (Patent Documents 3 and 4). On the other hand, in modern judo competitions, competition mats (especially international competition mats) are required to meet specific standards from the standpoint of fairness and safety in the competition (Non-Patent Document 1: Table 3).

[0004] In martial arts and combat sports, multiple tatami mats or mats are laid out in the competition room to form a tatami or mat floor, and the competition takes place on this tatami (floor) surface. Therefore, the competitors and the competition mats are inextricably linked, and fairness and stability of the competition, as well as the safety of the competitors, are taken into consideration.

[0005] For example, if a competition mat is too soft, athletes' feet may sink into the mat, leading to injuries such as toenail detachment, sprains, and ligament damage. On the other hand, if a competition mat is too hard, the strong rebound impact from the mat can cause injuries to the body (especially the head and neck) such as sprains, dislocations, fractures, and contusions. Furthermore, competition mats must also be durable, easy to handle, and economical, such as preventing stretching (creep) over time.

[0006] Accordingly, there is still a demand for developing a competition mat that ensures the fairness of competitions, secures the stability and safety of competitors, and also accounts for durability, ease of handling, economic efficiency and the like. [Prior Art Documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Utility Model Publication No. 56-005630 [Patent Document 2] Japanese Utility Model Publication No. 58-000826 [Patent Document 3] Japanese Utility Model Registration No. 3227100 [Patent Document 4] Japanese Utility Model Registration No. 3229987 [Non-Patent Document 1] Regulations for Approved Equipment (Judo Tatami) of the All Japan Judo Federation (public interest incorporated foundation) (https: / / www.judo.or.jp / cms / wp-content / uploads / 2020 / 11 / %E2%97%8F38-1) [Summary of the Invention] [Problem to be Solved by the Invention]

[0008] The present invention proposes a competition mat for martial arts and combat sports that combines all of the following: stability (hardness, strength, low resilience) and safety required for the person executing a technique; safety (absorbency, impact resistance) required for the person receiving a technique; competition ease (sliding steps, etc.) required for both persons; and durability, storage stability, restorability, handleability, economic efficiency and the like required as a competition mat. [Means for Solving the Problem]

[0009] [One Aspect of the Present Invention] The present invention proposes the following invention as one aspect thereof. (1) A competition mat, comprising: an outermost surface layer; an innermost back layer; A core layer comprising one or more foams and one or more heat-melting layers; The aforementioned heat-melted layer is formed by heating and / or pressurizing the foam, A competition mat comprising the heat-melting layer between the outermost layer and the central layer, between the innermost layer and the central layer, or between the plurality of foams. [2] The apparent density of the central layer is 0 g / cm³. 3 Excess 0.20g / cm 3 The following: The tensile strength of the aforementioned central layer is greater than 0 MPa and less than or equal to 2.0 MPa. The tensile elongation of the aforementioned central layer is less than 200%, The tear strength of the aforementioned central layer is 2.5 N / mm or more and 5.5 N / mm or less. The compressive stress (25%) of the aforementioned central layer is between 100 kPa and 200 kPa. The compression set of the central layer is greater than 0% and less than or equal to 5.0%. The heating dimensional change of the central layer is -2.0% or more and 2.0% or less, or The water absorption rate of the central layer is 0 g / cm³. 3 Excess 0.0005g / cm 3 The following is the competition mat described in [1]. [3] The thickness of the aforementioned fused layer is greater than 0 mm and less than or equal to 1 mm, or The competition mat according to [1] or [2], wherein the thickness of the foam is greater than 0 mm and less than 20 mm. [4] The heat-melted layer is formed between the outermost layer and the core layer, between the innermost layer and the core layer, or between a plurality of foams, as described in any one of [1] to [3]. [5] Further equipped with a central member, The central member is located between the heat-melted layer and the foam, on the outermost surface (outermost layer side) of the central layer, or on the innermost surface (outermost layer side) of the central layer, as described in any one of items [1] to [4]. [6] The central member is a metal foil or alloy foil, a resin sheet, a resin plate, a nonwoven fabric sheet, or a metal mesh sheet, as described in any one of items [1] to [5]. [7] The thickness of the central member is greater than 0 mm and less than 20 mm, as described in any one of items [1] to [6] for competition mats. [8] It comprises one or more intermediate layers, The competition mat described in any one of items [1] to [7], wherein the intermediate layer is formed between the outermost layer and the innermost layer, on the outermost surface (outermost layer side) of the central layer or the central member, or on the innermost surface (outermost layer side) of the central layer or the central member. [9] A competition mat as described in any one of the items [1] to [8], wherein interlocking parts are formed on four sides of the competition mat, and two corners in one diagonal direction are inclined at a 45° angle with respect to the side of the mat, and two corners in the other diagonal direction are right angles at a 90° angle, and the mat is formed symmetrically with respect to the diagonals.

[10] The competition mat according to [9], characterized in that the outermost layer and the innermost layer of the competition mat are painted in different colors. [Effects of the Invention]

[0010] According to the present invention, the following unique effects can be achieved by having a central layer comprising a foam and a heat-melted layer formed by heating and / or pressurizing the foam.

[0011] In other words, according to the present invention, it is possible to provide fair and safe competition for competitors in martial arts and combat sports.

[0012] According to the present invention, since the competition mat possesses appropriate resilience, recovery properties, and ease of movement, it is possible to significantly prevent competitors performing techniques from their feet sinking into the mat, thus preventing toenail detachment, sprains, ligament injuries, and the like.

[0013] According to the present invention, since the competition mat is equipped with appropriate impact resistance, shock absorption, and rebound properties, it is possible for the competitor receiving the technique to avoid strong impacts to their body and to significantly prevent injuries (sprains, dislocations, fractures, etc.).

[0014] According to the present invention, since the competition mat is made durable and economical, it is possible to significantly prevent stretching (creep) of the mat that may occur due to the frequency of competition, such as standing techniques and ground techniques (especially), and long-term use.

[0015] The competition mat according to the present invention uses flexible foam (especially recycled foam) with minimal use of hard materials such as wood and hard paper, thereby significantly improving the fairness, stability, and safety of the competition, while also achieving high levels of durability, weight reduction, ease of handling, improved utilization of recycled foam, and economic efficiency. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1(I) is a cross-sectional view of a competition mat according to an embodiment of the present invention. Figure 1(II) is a cross-sectional view of a competition mat according to an embodiment of the present invention. [Figure 2] This is a cross-sectional perspective view of a competition mat according to an embodiment of the present invention. [Figure 3] This is a cross-sectional perspective view of a competition mat according to an embodiment of the present invention. [Figure 4] This is a plan view of a competition mat according to an embodiment of the present invention. [Figure 5] This is a view from above of a competition mat according to an embodiment of the present invention. [Figure 6] This is a schematic diagram of a connected competition floor mat, which is formed by linking together competition mats according to an embodiment of the present invention, as viewed from above. [Figure 7] This figure shows an example of the use of a connected competition floor mat, which is formed by linking together competition mats according to an embodiment of the present invention. [Modes for carrying out the invention]

[0017] [Definition] (Physical properties and measurement methods: adapted from JIS standard K6767:1999 / 2019) In this invention, the physical properties of the materials (layers) constituting the competition mat and the method for measuring them can be carried out in accordance with the provisions of JIS standard K6767:1999. Therefore, the physical properties used in the present invention, namely, apparent density (g / cm³), 3 ); Compressive stress-strain (25%:kPa); Compression set (%); Tensile strength (MPa) and tensile elongation (%); Thermal stability (%); Water absorption (g / cm³) 3 Flammability; compressive hardness; dynamic buffering performance; compressive creep; and thermal conductivity, etc., shall be measured according to the method described in JIS standard K6767, and the measured values ​​shall be used as numerical values. Accordingly, all matters described in JIS standard K6767 and other JIS standards applied mutatis mutandis in JIS standard K6767 shall be fully incorporated into this specification.

[0018] (Hardness and its measurement method: JIS standard K7312:1999) In this invention, hardness and its measurement method are measured by the Type C hardness test specified in "7. Hardness Test" of JIS standard K7312:1999, and the measured value (hardness) is used as a numerical value. Accordingly, all matters described in JIS standard K7321 and other JIS standards applied mutatis mutandis in JIS standard K7321 are fully incorporated into this specification.

[0019] (Foam: Synthetic resin) The "foam" may be composed of an inorganic substance or an organic substance (preferably), or it may be composed of an organic substance containing an inorganic substance (preferably a hollow body), and more preferably it may be composed of a synthetic resin (organic substance). Furthermore, the "foam" can be recycled foam discarded during product manufacturing, or foam recovered and recycled from products (bedding, fixtures, vehicle interiors, home appliances, etc.), as well as recycled products thereof. Examples of "synthetic resins" include polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), polyacrylic resin (PA), epoxy resin, polycarbonate (PC), polyphenol (PF), polyvinyl chloride (PVC), urea resin (UF), polysilicone (SI), polyimide (PI), melamine resin (MF), and fluororesin (PF).

[0020] The term "layer" refers to a component in a laminated structure, and is a concept that encompasses various forms such as films, sheets, plates, foils, and membranes, without being limited by their specific names.

[0021] In this invention, "competition" refers to martial arts and combat sports, such as judo, jujutsu, karate, aikido, shorinji kempo, self-defense techniques, ancient martial arts, wrestling, taekwondo, and other martial arts.

[0022] [One Embodiment of the Invention] One aspect of the present invention proposes a competition mat (laminated structure) comprising: an outermost layer; an innermost layer; and a core layer having one or more foams and one or more heat-melting layers.

[0023] [Competition mat (laminated structure)] Figure 1 is a cross-sectional view of a competition mat 1 according to one embodiment of the present invention. Figure 2 is a cross-sectional perspective view of a competition mat 1 according to one embodiment of the present invention.

[0024] As shown in Figures 1 and 2, the competition mat 1 is made up of a laminated structure. Specifically, as shown in Figure 1(I), the surface of the competition mat 1 is made up of the outermost layer 11A, and the back surface of the competition mat 1 is made up of the outermost layer 11B. In addition, a core layer 14 (or core member 15 if necessary) is laminated between the outermost layer 11A and the outermost layer 11B.

[0025] According to a preferred embodiment of the present invention, as shown in Figure 1(II), a sports mat is proposed, in which an arbitrary layer, for example, one or more intermediate layers (N-th intermediate layers) are laminated between the outermost surface layer 11A and the outermost surface layer 11, and between the outermost surface layer 11A, the outermost surface layer 11, the central layer 14 and / or the central member 15.

[0026] Specifically, as shown in Figure 1(II), a first intermediate layer 12A and a first intermediate layer 12B may be respectively laminated on the inner side (i.e., the central layer 14 side or the central member 15 side) of the outermost surface layer 11A and the outermost back layer 11B respectively. Further, a second intermediate layer 13A and a second intermediate layer 13B may be respectively laminated on the inner side (i.e., the central layer 14 side / the central member 15 side) of the first intermediate layer 12A and the first intermediate layer 12B respectively. Of course, the laminated structure may be reversed between the first intermediate layer 12 and the second intermediate layer 13. As described above, the sports mat 1 according to the present invention is a laminated structure constituted by a plurality of constituent layers (materials).

[0027] [Central Layer] According to the present invention, as shown in Figure 1(I), one or more heat-melted layers 14A m and one or more foam bodies 14B n comprising a central layer 14 provided with; the heat-melted layer 14A m is the foam body 14B n which is constituted by heating and / or pressurizing. In the present invention, preferably, the heat-melted layer 14A m is disposed between the outermost surface layer 11A and the foam body 14B n between the outermost back layer 11B and the foam body 14B n or between the plurality of foam bodies 14B n a sports mat 1 constituted (formed, positioned, arranged; the same applies hereinafter) therein is proposed.

[0028] According to a preferred embodiment of the present invention, one or more heat-melted layers 14A m wherein the number m ≧ 1, preferably m is 1 or more and 10 or less, more preferably m is 2 or more and 6 or less, and most preferably 3 or more and 5 or less. Further, one or more foam bodies 14B nIn this case, the number n ≥ 1, preferably n is 1 or more and 10 or less, more preferably n is 2 or more and 6 or less, and most preferably 3 or more and 5 or less. According to a more preferred embodiment of the present invention, the molten layer 14A m and foam 14B n In the central layer 14, the number m and the number n may be the same (preferably) or different.

[0029] <thickness> The thickness of the central layer 14 can be appropriately determined considering the thickness of the competition mat 1 (usually 5 cm or 6 cm), the outermost layer 11A, the outermost layer 11B, and any other layer (the Nth intermediate layer), with the lower limit being greater than 0 cm, preferably 0.5 cm or more or 1 cm or more, more preferably 1 cm or more or 2 cm or more, and the upper limit being less than 5 cm or less or 6 cm, preferably 4 cm or less or 5 cm or less, more preferably 3 cm or less or 4 cm or less.

[0030] The molten layer 14A that constitutes the central layer 14 m Thickness and foam 14B n The thickness of the foam 14B can also be determined considering the thickness of the competition mat and the thickness of the intermediate layer as described above, and in a preferred embodiment, n The thickness is one heat-melted layer 14A m The thickness may be 1 to 10 times, preferably 1.5 to 8 times, the thickness of the material.

[0031] (Thermal melt layer 14A m ) In the present invention, the thermal melting layer 14A m is foam 14B n It may be constructed by heating and / or pressurizing foam B. n It is prepared by heating and / or pressurizing it near its melting point. According to a preferred embodiment of the present invention, foam 14B n Foam 14B near its melting temperature n The surface of is heated and / or pressurized to melt it, and then the other foam 14B nIt can be constructed by laminating the outermost layer 11A, the innermost layer 11B, and any other layer, and then applying appropriate pressure to bond them together. Foam 14B n By heating and / or pressurizing, foam 14B n A thermal fusion layer 14A on the surface m This makes it possible to easily form the intermediate layer 14 having desired physical properties without using adhesives or other bonding methods in lamination with the outermost layer 11A or the innermost layer 11B.

[0032] <thickness> Heat melting layer 14A m The thickness can be appropriately determined considering the thickness of the competition mat 1 (usually 5 cm or 6 cm), the outermost layer 11A, the outermost layer 11B, and any other layer (the Nth intermediate layer), with the lower limit being greater than 0 mm, preferably 0.1 mm or more, more preferably 0.5 mm or more, and the upper limit being 10 mm or less, preferably 5 mm or less, and more preferably 1 mm or less.

[0033] (Foam 14B) n ) Foam 14B n These may be the same or different types. Also, foam 14B n The synthetic resins defined above include, for example, polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), polyacrylic resin (PA), epoxy resin, polycarbonate (PC), polyphenol (PF), polyvinyl chloride (PVC), urea resin (UF), polysilicone (SI), polyimide (PI), melamine resin (MF), and fluororesin (PF). Preferably, the resins are formed from a selection of polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), phenol resin (PF), and polyvinyl chloride (PVC).

[0034] In another preferred embodiment, inorganic substances (fillers, hollow beads, etc.) may be added during foam formation using a synthetic resin and a foaming agent (foaming method) to prepare the foam to exhibit desired physical properties.

[0035] <thickness> Foam 14B n The thickness has a lower limit of over 0 mm, preferably 1 mm or more, more preferably 5 mm or more, and an upper limit of 40 mm or less, preferably 30 mm or less, and more preferably 20 mm or less.

[0036] [Central component] According to a preferred embodiment of the present invention, as shown in Figures 1 and 2, the central layer 14 may include a central member 15. The central member 15 is the heat-melted layer 14A that constitutes the central layer 14. m and foam 14B n During this time, it may be formed on the outermost surface (outermost layer 11A side) or the innermost surface (outermost surface layer 11B side) of the central layer 14, and preferably it is formed in the center of the central layer 14.

[0037] <Components> The central member 15 is preferably made of metal (alloy) foil, such as aluminum foil or stainless steel foil. Metal (alloy) foil reduces the horizontal deformation of the competition mat, making it possible to more significantly prevent creep (lateral stretching) of the competition mat 1. Furthermore, since the central member (foil material) 15 is made of thin metal foil, it can exhibit a high level of effectiveness as a lightweight creep (lateral stretching) prevention material.

[0038] In a preferred embodiment of the present invention, the central member 15 may be an organic material with high hardness, such as a resin sheet or a resin plate (plate material). The organic material may be formed from the synthetic resin described above, and can be used even if it is formed in a foamed or hollow form. In addition, the central member 15 can also be an organic fiber, such as a para-aramid fiber (e.g., Kevlar fabric®), a resin nonwoven fabric sheet with little deformation and high hardness, or a metal mesh sheet. From the above, the central member 15 may be a resin sheet, a resin plate, a nonwoven fabric sheet, or a metal mesh sheet, and creep (lateral stretching) of the competition mat 1 can be significantly prevented.

[0039] <thickness> The thickness of the central member 15 can be appropriately determined considering the thickness of the competition mat 1 (usually 5 cm or 6 cm), the outermost layer 11A, the innermost layer 11B, and any other layer (the Nth intermediate layer), with the lower limit being greater than 0 mm, preferably 0.1 mm or more, more preferably 0.5 mm or more, and the upper limit being less than 2 mm, preferably 1.5 mm or less, and more preferably 1 mm or less.

[0040] (Physical properties of central layer 14: In accordance with JIS standard K6767:1999) In this invention, the physical properties of the central layer 14 constituting the competition mat are measured and defined as measured values ​​in accordance with the provisions of JIS standard K6767:1999.

[0041] By setting the specific physical properties of the central layer 14 within the following numerical ranges, it becomes possible to significantly improve the fairness, stability, and safety of the competition, as well as to propose a competition mat that excels in rebound, recovery, ease of movement, impact resistance, shock absorption, durability, lightweight design, ease of handling, and cost-effectiveness.

[0042] (Apparent density) The apparent density of the central layer 14 is 0 g / cm³. 3 Excess 0.20g / cm 3 The following is true, and preferably the upper limit is 0.20 g / cm³. 3 The following applies: (Tensile strength) The tensile strength of the central layer 14 is greater than 0 MPa and 2.0 MPa or less, preferably with an upper limit of 1.5 MPa or less, and more preferably with an upper limit of 1.0 MPa or less. (Tensile elongation) The tensile elongation of the central layer 14 is less than 200%, preferably 150% or less, and more preferably 120% or less. (Tear strength) The tear strength of the central layer 14 is 2.5 N / mm or more and 5.5 N / mm or less, preferably with a lower limit of 3.0 N / mm or more and an upper limit of 5.0 N / mm or less, more preferably with a lower limit of 3.5 N / mm or more and an upper limit of 4.5 N / mm or less. (Compressive stress) The compressive stress (25%) of the central layer 14 is between 100 kPa and 200 kPa, preferably with a lower limit of 130 kPa or more and an upper limit of 180 kPa or less, more preferably with an upper limit of 140 kPa or more and an upper limit of 170 kPa or less. (Compression permanent deformation) The compression set of the central layer 14 is greater than 0% and less than or equal to 5.0%, preferably with a lower limit of 1.0% or more and an upper limit of 4.0% or less, more preferably with an upper limit of 2.0% or more and an upper limit of 3.0% or less. (Dimensional change due to heating) The heating dimensional change of the central layer 14 is -2.0% or more and 2.0% or less, preferably with a lower limit of -1.5% or more and an upper limit of 1.5% or less, more preferably with an upper limit of -1.0% or more and an upper limit of 1.0% or less. (Water absorption rate) The water absorption rate of the central layer 14 is 0 g / cm³. 3 Excess 0.0005g / cm 3 The following is true, preferably with a lower limit of 0.0001 g / cm³. 3 The above is the result, and the upper limit is 0.0004 g / cm³. 3 The following, and more preferably, the upper limit is 0.0002 g / cm³. 3 The above is the result, and the upper limit is 0.0003 g / cm³. 3 The following applies:

[0043] [Outermost layer 11A and innermost layer 11B] In the present invention, the surface on which the athlete competes on the competition mat can be designated as the outermost layer 11A, while the surface on which the athlete does not compete and which is in contact with the installation location of the competition mat (for example, the floor) can be designated as the innermost layer 11B.

[0044] According to a preferred embodiment of the present invention, the outermost layer 11A and the innermost layer 11B may be constructed in the same form, in which case they may be the front or back depending on the installation location, and as described later, they may be distinguished by the form (shape, pattern, color) of the outermost surface and used as either the outermost layer 11A or the innermost layer 11B. Therefore, according to a preferred embodiment of the present invention, if the competition mat can be used on both sides, i.e., is reversible, the outermost layer 11A and the innermost layer 11A may be the same.

[0045] (Synthetic resin) The outermost layer 11A and the innermost layer 11B are synthetic resins as defined above, for example, polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), polyacrylic resin (PA), epoxy resin, polycarbonate (PC), polyphenol (PF), polyvinyl chloride (PVC), urea resin (UF), polysilicone (SI), polyimide (PI), melamine resin (MF), and fluororesin (PF). Preferably, they are formed from a selection of polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), phenol resin (PF), and polyvinyl chloride (PVC). The outermost layer 11A and the innermost layer 11B may be formed from the same or different synthetic resins.

[0046] (Form: Thickness) The outermost layer 11A and the innermost layer 11B may be in the form of thin sheets. The thickness of the outermost layer 11A and the innermost layer 11B can be appropriately determined considering the thickness of the competition mat 1 (usually 5 cm or 6 cm), the thickness of the outermost layer 11A, the innermost layer 11B, and any other layer (the Nth intermediate layer), and is greater than 0 mm and less than or equal to 10 mm, with a lower limit of preferably 0.3 mm or more, more preferably 0.5 mm or more, and an upper limit of preferably 5 mm or less, more preferably 1 mm or less.

[0047] (Laminated) When the outermost layer 11A and the innermost layer 11B are laminated with the first intermediate layer 12 and the second intermediate layer 13, and optionally with the central layer 14 (and central member 15), they may be laminated by heat compression bonding or adhesive bonding.

[0048] (Uneven processing) According to a preferred embodiment of the present invention, the outermost surfaces of the outermost layer 11A and the innermost layer 11B may be subjected to a fine textured finish. The textured finish is, for example, an embossed finish resembling a tatami mat used for judo, which provides good mobility (e.g., footwork) when performing sliding foot movements and exhibits a moderate anti-slip effect.

[0049] The uneven surface processing may be performed by methods such as: inserting an organic resin into an uneven surface mold when forming the outermost surface layer 11A and the innermost surface layer 11B; pressing a heated uneven surface sheet onto the outermost surface of the outermost surface layer 11A and the innermost surface layer 11B; or applying an uneven emboss to the outermost surface using a heated embossing roll; and so on.

[0050] (color) The outermost layer 11A and the innermost layer 11B can be colored in different colors. For example, within a stadium, areas where the outermost layer 11A, colored in one color (e.g., blue), is laid face up can be designated as the "inside of the stadium," while areas where the innermost layer 11B, colored in another color (e.g., red or pink), is laid face up can be designated as the "outside of the stadium." By distinguishing the outermost layer 11A and the innermost layer 11B by their different colors, even if they have the same structure and function, the competition area and competition location can be clearly indicated and distinguished. In this sense, in the above embodiment, it goes without saying that the innermost layer 11B functions as the outermost layer 11A, and the outermost layer 11A functions as the innermost layer 11B.

[0051] [Optional layer] In a preferred embodiment of the present invention, any layer, for example, one or more intermediate layers (the Nth intermediate layer), may be laminated. Specifically, the first intermediate layer 12 (12A and 12B) and / or the second intermediate layer 13 (13A and 13B) shown in Figure 1(II) may be included. In one or more intermediate layers (the Nth intermediate layer), the number N ≥ 1, preferably the number N is 1 or more and 10 or less, more preferably the number N is 2 or more and 6 or less, and most preferably 3 or more and 5 or less.

[0052] When stacking arbitrary layers, for example, one or more intermediate layers (the Nth intermediate layer) may be configured between the first intermediate layer 12A (on the outermost layer 11A side) or the first intermediate layer 12B (on the innermost layer 11B side) and the central layer 14 or central member 15, or between the second intermediate layer 13A (on the outermost layer 11A side) or the second intermediate layer 13B (on the innermost layer 11B side) and the central layer 14 or central member 15.

[0053] (First Middle Class) The first intermediate layer 12 (first intermediate layer 12A and first intermediate layer 12B) may be laminated on the inside (center layer 14 side) of the outermost layer 11A and the innermost layer 11B, for example, as shown in Figure 1(II).

[0054] In a preferred embodiment of the present invention, the first intermediate layer 12 is preferably made of a material that has lower hardness and flexibility compared to the second intermediate layer 13. As a result, the first intermediate layer 12 has superior shock absorption compared to the second intermediate layer 13, and can advantageously absorb impact to ensure the safety of competitors when performing techniques or when competitors are thrown and brought down after being subjected to a technique.

[0055] (Second Middle Class) The second intermediate layer (second intermediate layer 13A and second intermediate layer 13B) may be laminated between the first intermediate layer 12 and the central layer 14, for example, as shown in Figure 1(II).

[0056] In a preferred embodiment of the present invention, the second intermediate layer 13 is preferably made of a material that has higher hardness and rigidity compared to the first intermediate layer 12. As a result, the second intermediate layer 13 has excellent vertical resilience, ensures footwork when athletes move while standing (sliding steps), maintains the vertical strength of the competition mat 1, and can also effectively prevent creep (lateral stretching).

[0057] (Foam: Synthetic resin) The first intermediate layer 12 and the second intermediate layer 13 are synthetic resins as defined above, for example, polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), polyacrylic resin (PA), epoxy resin, polycarbonate (PC), polyphenol (PF), polyvinyl chloride (PVC), urea resin (UF), polysilicone (SI), polyimide (PI), melamine resin (MF), and fluororesin (PF). Preferably, they are selected from the group consisting of polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), phenol resin (PF), and polyvinyl chloride (PVC), and more preferably they are structures (foams) composed of resins selected from the group consisting of polystyrene (PS), polyethylene (PE), and polypropylene (PP).

[0058] The first intermediate layer 12 (first intermediate layer 12A and first intermediate layer 12B) and the second intermediate layer 13 (second intermediate layer 13A and second intermediate layer 13B) may each be a sheet, plate, or foam (preferably) formed from the same or different synthetic resins.

[0059] (hardness) The second intermediate layer 13 may be configured to have a higher hardness compared to the first intermediate layer 12.

[0060] The hardness of the second intermediate layer 13 may be configured in different ways depending on the type of sport and the level of the athlete (skill and level class, weight, etc.). For example, the hardness may be low for lighter weight classes and high for heavier weight classes.

[0061] For example, if competition mat 1 is for judo and karate competitions, a hardness of 50 degrees is sufficient for general use or standard specifications. For lightweight (preschoolers to lower elementary school students: for example, around 40 kg) and beginners, the hardness can be set to 40 degrees. Alternatively, if it is a competition mat for extra-heavyweight (for example, over 100 kg) and advanced users, the hardness may be adjusted to 60 degrees.

[0062] Furthermore, the hardness and thickness of the first intermediate layer 12 and the second intermediate layer 13 can be combined in any way and may be the same or different. For example, the second intermediate layer 13A and the second intermediate layer 13B may be prepared with a hardness of 40 degrees or more and 60 degrees or less, and the first intermediate layer 12A and the first intermediate layer 12B may be prepared with a hardness of 40 degrees or more and 55 degrees or less.

[0063] Specifically, for beginners, by preparing the second intermediate layer 13A and the second intermediate layer 13B to a hardness of 40 degrees, and the first intermediate layer 12A and the first intermediate layer 12B to a hardness of 40 degrees, a competition mat 1 with excellent shock absorption can be provided. Furthermore, for intermediate users, by preparing the second intermediate layer 13A and the second intermediate layer 13B to a hardness of 40 degrees, and the first intermediate layer 12A and the first intermediate layer 12B to a hardness of 55 degrees, it is possible to provide a competition mat 1 that maintains the desired shock absorption while ensuring stability and enhancing creep prevention. Furthermore, for advanced users, a competition mat 1 with enhanced stability and creep prevention can be provided by preparing the second intermediate layer 13A and the second intermediate layer 13B to a hardness of 60 degrees, and the first intermediate layer 12A and the first intermediate layer 12B to a hardness of 55 degrees.

[0064] [A Preferred Embodiment] Figure 3 is a cross-sectional perspective view of a competition mat 10 according to a preferred embodiment of the present invention. As shown in Figure 3, the entire competition mat 10 may be formed so as to be covered with a top surface layer 101. The top surface layer 101 may be the same as the top surface layer 11 (top surface layer 11A and top surface layer 11B) described above.

[0065] [Other Preferred Embodiments] Figure 4 is a plan view of a competition mat 20 according to a preferred embodiment of the present invention. As shown in Figure 4, the competition mat 20 may also include an outermost layer 201 (outermost layer 201A and outermost layer 201B) on which a random pear-textured uneven surface is applied. The outermost layers 201A and 201B may be the same as the outermost layer 11 (outermost layer 11A and outermost layer 11B) described above, except that they are given an uneven surface.

[0066] (thickness) The overall thickness of the competition mats 1, 10, and 20 according to the present invention is generally 5 cm or 6 cm. However, for purposes other than use in official domestic and international competitions, the thickness may be designed and adjusted to 1.5 cm to 5 cm or 6 cm or less, depending on the type of competition, the rank and level of the competitors.

[0067] As shown in Figure 1(II), the thickness T of the second intermediate layer 13A and the second intermediate layer 13B can be approximately 5 mm, and the thickness t of the first intermediate layer 12A and the first intermediate layer 12B can be approximately 4 mm to 5 mm. In addition, the thickness of the competition mat 1 may be adjusted to a thickness of 4 mm to 15 mm to match the characteristics required for a competition mat.

[0068] (hardness) The hardness of the foam (e.g., polyethylene foam) constituting the first intermediate layer 12A and the first intermediate layer 12B, or the second intermediate layer 13A and the second intermediate layer 13B, may be identified as the particle density of polyethylene. The first intermediate layer 12A and the first intermediate layer 12B may be integrally bonded and fixed to the second intermediate layer 13A and the second intermediate layer 13B, respectively, by adhesive. An appropriate amount of adhesive (e.g., rubber-based adhesive, synthetic resin-based adhesive, etc.) can be applied to the surface of the board, and these can be bonded together by pressing and drying.

[0069] (Thickness: Textured surface) In the other embodiment shown in Figure 4, the surfaces of the outermost layer 201A and the innermost layer 201B are formed with randomly and densely arranged small anti-slip protrusions. The diameter of the protrusions is generally 0.2 mm to 0.5 mm, and these protrusions are formed on the film at intervals of 0.2 mm to 0.5 mm, forming random (undistinguished) anti-slip protrusions.

[0070] The anti-slip protrusions are formed by an embossing process, also known as a textured or matte finish, creating fine, non-slip bumps. Next, by integrally attaching the processed outermost layer 201A and outermost layer 201B to the first intermediate layer 12A and first intermediate layer 12B, deterioration such as creep and stretching of the competition mat 20 due to aging can be significantly prevented.

[0071] [Another Preferred Embodiment] In an embodiment of the present invention, particularly the embodiment shown in Figure 4, a competition mat 20 is shown in which an outermost layer 201A and an outermost layer 201B with anti-slip protrusions are attached to the outer surface. On the other hand, in another embodiment of the present invention (not shown), a first intermediate layer 12A and a first intermediate layer 12B made of (polyethylene) foam with a different hardness than the second intermediate layer 13A and the second intermediate layer 13B are attached to the upper and lower surfaces of the second intermediate layer 13A and the second intermediate layer 13B made of (polyethylene) foam, and anti-slip protrusions are further formed directly on the surface of the first intermediate layer 12A and the first intermediate layer 12B at random intervals. An embodiment in which the anti-slip protrusions on the surface of the first intermediate layer 12A and the first intermediate layer 12B are formed by pressing a heated embossed sheet onto the surface of the first intermediate layer 12A and the first intermediate layer 12B and applying an embossed pattern to the surface of the first intermediate layer 12A and the first intermediate layer 12B using a heated embossing roll can also be proposed.

[0072] [Second Embodiment of the Invention] A second embodiment of the present invention, a competition mat 30, will be described with reference to Figures 5 to 7.

[0073] Figure 5 is a view of the competition mat 30 according to the present invention from above. The laminated structure of the competition mat 30 shown in Figure 5 is the same as the laminated structure of the competition mat 1 (see Figure 1) according to the first embodiment, so a description is omitted.

[0074] Multiple interlocking parts 301 (interlocking parts 301A and 301B) with a concave or concave shape are formed on the outer sides of all four sides of the competition mat 30. As will be described later, the concave (convex) interlocking parts 301A of one competition mat 30 adjacent to the other competition mat 30 and the corresponding convex (concave) interlocking parts 301B of the other competition mat 30 of the same shape fit together tightly, connecting the competition mats 30 together and thus forming a competition area of ​​a predetermined size. Of course, the interlocking parts with a concave or concave shape formed on the sides are not limited to the form shown.

[0075] Two corners on one diagonal A of the rectangular competition mat 30 are cut perpendicular to diagonal A, meaning they are inclined corners 302A and 302B at a 45° angle to the outer edge of the competition mat 30. The two corners on the other diagonal of the competition mat 30 are right-angled corners, namely right-angled corner 303A and inclined corner 303B. The two inclined corners 302A and 302B on one diagonal A are identical in shape, and the two right-angled corners 303A and 303B on the other diagonal are also identical in shape. Therefore, the mat 30 is formed symmetrically with respect to diagonal A.

[0076] Figure 6 is a schematic view from above of a connected competition floor mat according to a second embodiment of the present invention, which is formed by linking together competition mats. The connected competition floor mat 40 shown in Figure 6 is formed by connecting competition mats 30, 31, 32, 33, 34, etc., which have the same shape as each other, using a mat-to-mat interlocking mechanism. In Figure 6, the right side of competition mat 31, the left side of competition mat 32, the lower side of competition mat 33, and the upper side of competition mat 34, which have the same shape as each other, are arranged on the left and right and upper and lower sides of competition mat 30, respectively.

[0077] In the connected competition floor mats 40, the corner shapes of each competition mat 30, 31, 32, 33, 34, etc., are identical in the diagonal direction. Therefore, for example, one competition mat 30 can be flipped over and fitted into place. When flipping it over, for example, in Figure 2, if one diagonal A is used as a virtual axis and the central competition mat 30 is rotated 180° around that diagonal A, the back side of the mat will appear on the front side. Thus, the competition mat 30 according to the second embodiment can be installed on the floor surface with the front and back sides freely selected. Furthermore, the surface properties (material, shape of fine irregularities) of the front and back sides of the mat can be made the same, and different colors can be applied to the front and back sides.

[0078] Figure 7 shows an example of the use of a connected competition floor mat, which is formed by linking together competition mats according to a second embodiment of the present invention. Figure 7 shows an example in which a connected competition floor mat 40 is constructed by linking together competition mats 30 that have different colors on their front and back surfaces. Figure 7(a) shows the configuration of a competition mat for karate in kumite competition (with standing position indicators) in which two athletes compete, and Figure 7(b) shows the configuration of a competition mat used in kata competition in judo or karate, in which one athlete performs a kata.

[0079] In the second embodiment (example), an example was shown in which the layers formed from synthetic resin foam consist of a pair of first intermediate layers 12 and second intermediate layers 13. However, the number of layers made of synthetic resin foam may be increased, or conversely, the number of constituent layers may be reduced, for example, by reducing the number of layers formed from synthetic resin foam to only the first intermediate layer.

[0080] In a preferred embodiment of the present invention, a central member (foil) 15 is sandwiched between the central layer 14, and further sandwiched and attached by the first intermediate layer 12 and the second intermediate layer 13. Of course, in the present invention, the central member (foil) 15 may also be sandwiched and attached, for example, between the first intermediate layer 12 and the second intermediate layer 13. In this case, creep (lateral stretching) of the competition mat can be significantly prevented.

[0081] [Usage] The above embodiment of the present invention can be used, for example, as a competition mat laid on the floor of a competition room where martial arts competitions such as judo, karate, aikido, Shorinji Kempo, and wrestling are held, and is preferably used as a competition mat for judo (especially), wrestling, etc.

[0082] In the present invention, the surface shape of the outermost layer 11A and the innermost layer 11B are substantially the same, and the mat may be rectangular (for example, Kodokan Judo competition and judging regulations: length × width = 182 cm × 91 cm, and International Judo standards: length × width = 200 cm × 100 cm) or square (for example, International Judo standards: all four sides = 100 cm (half a tatami mat)).

[0083] In one embodiment of the present invention, a competition mat unit may be formed by laying multiple competition mats 1, each having a planar shape of approximately 1 m square, adjacent to each other in the X and Y directions (left and right, up and down) of the competition room floor, thereby creating a competition floor of a desired area.

[0084] (Technical significance: Effects of the invention) The competition mats 1, 10, and 20 according to the present invention are composed of multiple (polyethylene) foams with different strengths, including the outermost surface layer 11A and outermost surface layers 11B, 101, 201A, and 201B. As a result, they have good shock absorption and can significantly prevent serious injuries caused by falls during grappling, leg sweeps, or throws during competition.

[0085] For example, during competition, the way a competitor moves differs depending on the vertical and horizontal directions of the tatami mat surface, as is the case with conventional tatami mat patterns and grid patterns. This significantly prevents accidents such as toenails getting caught in a certain direction, leading to nail detachment and damage. Furthermore, the random (non-directional) granular embossed surface of the outermost layer 201A and the innermost layer 201B provides appropriate friction, preventing excessive slipperiness and stickiness, and ensuring the footwork necessary for competition.

[0086] According to another aspect of the present invention, by preparing competition mats 1, 10, and 20 with varying hardness levels within a range of 40 to 60 degrees, it is possible to provide the convenience of being able to freely select and easily replace mats with appropriate hardness levels according to the skill level of the competitors. This ease of replacement prevents head injuries from falls, even for beginners, and significantly prevents or avoids physical injuries such as excessive sinking, even for heavyweight competitors. [Explanation of Symbols]

[0087] 1 Competition mat 11A Top layer 11B Backmost layer 12. First Meso-Place 13. Second Meso-Marginal Layer 14 Central layer 14A thermal melting layer 14B foam 15. Central Member 20 Competition mats 101 Outermost layer / Innermost layer 201A Top surface layer 201B Backmost layer 30 Competition Mats 301 Engagement part 302 Inclined corner part 303 Right-angle corner 40 Interlocking floor mats for competition

Claims

1. It is a competition mat, outermost layer; The innermost layer; A core layer comprising one or more foams and one or more fused layers; It is equipped with, The aforementioned heat-melt layer is a layer formed by heating and / or pressurizing the surface layer of one foam to integrate it with another foam, and is formed by pressing the outermost layer with the other foam and the innermost layer with the other foam together without the use of an adhesive. The apparent density of the central layer is greater than 0 g / cm³ and less than or equal to 0.20 g / cm³. The tensile strength of the aforementioned central layer is greater than 0 MPa and less than or equal to 2.0 MPa. The tensile elongation of the aforementioned central layer is less than 200%, The tear strength of the central layer is 2.5 N / mm or more and 5.5 N / mm or less. The compressive stress (25%) of the aforementioned central layer is between 100 kPa and 200 kPa. The compression set of the central layer is greater than 0% and less than or equal to 5.0%. The heating dimensional change of the central layer is -2.0% or more and 2.0% or less, or The water absorption rate of the central layer is greater than 0 g / cm³ and less than or equal to 0.0005 g / cm³, and the combination of these physical properties is characterized by achieving both shock absorption and recovery when an athlete falls.

2. The thickness of the aforementioned fused layer is greater than 0 mm and less than or equal to 1 mm, or The competition mat according to claim 1, wherein the thickness of the foam is greater than 0 mm and less than 20 mm.

3. The competition mat according to claim 1, wherein the heat-melting layer is formed between the outermost layer and the core layer, between the innermost layer and the core layer, or between a plurality of foams.

4. Further equipped with a central member, The competition mat according to claim 1, wherein the central member is located between the heat-melted layer and the foam, on the outermost surface of the central layer (on the outermost layer side), or on the innermost surface of the central layer (on the innermost layer side).

5. The competition mat according to claim 4, wherein the central member is a metal foil or alloy foil, a resin sheet, a resin plate, a nonwoven fabric sheet, or a metal mesh sheet.

6. It comprises one or more intermediate layers, The competition mat according to claim 4, wherein the intermediate layer is formed between the outermost layer and the innermost layer, on the outermost surface (outermost layer side) of the central layer or the central member, or on the innermost surface (outermost layer side) of the central layer or the central member.

7. The competition mat according to claim 1, wherein interlocking parts are formed on four sides of the competition mat, and two corners in one diagonal direction are inclined at 45° with respect to the side of the mat, and two corners in the other diagonal direction are right angles of 90°, and the mat is formed symmetrically with respect to the diagonals.

8. The competition mat according to claim 7, characterized in that the outermost layer and the innermost layer of the competition mat are painted in different colors.

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