Mat for competition

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] The present invention relates to a competition mat, particularly a competition mat used for martial arts and combat sports competitions.

Background Art

[0002] Conventionally, in martial arts and combat sports, so-called tatami mats with straw or the like as the core material and rush grass on the surface have been used. In modern times, competition tatami mats incorporating a part of the core material such as a wood board, cardboard, foam, felt, rigid rubber, honeycomb-structured kraft paper, or a combination of two or more of these have been proposed (Patent Documents 1 and 2).

[0003] In recent years, from the viewpoints of ease of installation and storage, etc., reversible competition mats that are rectangular and have their outer sides composed of concave-convex fitting parts have been proposed (Patent Documents 3 and 4). On the other hand, in modern judo competitions, from the viewpoints of fairness and safety of the competition, etc., competition mats (especially international competition tatami mats) are required to meet specific standards (Non-Patent Document 1: Table of Article 3).

[0004] In martial arts and combat sports, a plurality of tatami mats or mats are laid on the floor of the competition hall to form a tatami floor and a mat floor, and the competition is held on this tatami (floor) surface. Therefore, there is an inseparable relationship between the competitor and the competition mat, and fairness and stability of the competition, safety for the competitor, etc. are considered.

[0005] For example, when the hardness of the competition mat is too soft, for the competitor, the foot may sink into the mat, causing nail peeling, sprains, ligament injuries, etc. On the other hand, when the hardness of the competition mat is too hard, for the competitor, it may cause damage (sprains, dislocations, fractures, contusions, etc.) to the body (especially the head and neck) due to a strong impact from the competition mat. Also, for the competition mat, durability such as no elongation (creep) of the mat due to long-term use, ease of handling, and economy are also required.

[0006] Therefore, there is still a need to develop a competition mat that ensures the fairness of the competition, guarantees the stability and safety of the competitors, and takes into account durability, ease of handling, and economy, etc.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention proposes a competition mat that combines the stability (hardness, strength, low resilience) and safety required for the person applying a technique in martial arts and combat sports; the safety (absorbency, shock resistance) required for the person receiving the technique; the ease of competition (such as folding feet) required for both; and the durability, storage stability, recoverability, handleability, and economy required for a competition mat.

Means for Solving the Problems

[0009] 〔One Aspect of the Present Invention〕 The present invention proposes the following invention as one of its aspects. 〔1〕 A competition mat, The outermost surface layer; The innermost surface layer; A center layer comprising one or more foams and one or more heat-melted layers; The heat-melted layer is formed by heating and / or pressing the foam. The heat-melted layer is formed between the outermost layer and the center layer, between the innermost layer and the center layer, or between the plurality of foams, and is a sports mat. 〔2〕 The apparent density of the center layer is more than 0 g / cm 3 and less than or equal to 0.20 g / cm 3 as follows. The tensile strength of the center layer is more than 0 MPa and less than or equal to 2.0 MPa. The tensile elongation of the center layer is less than 200%. The tear strength of the center layer is 2.5 N / mm or more and 5.5 N / mm or less. The compression stress (25%) of the center layer is 100 kPa or more and 200 kPa or less. The compression set of the center layer is more than 0% and less than or equal to 5.0%. The heat dimensional change of the center layer is -2.0% or more and 2.0% or less, or The water absorption rate of the center layer is more than 0 g / cm 3 and less than or equal to 0.0005 g / cm 3 as follows. The sports mat according to 〔1〕. 〔3〕 The thickness of the heat-melted layer is more than 0 mm and less than or equal to 1 mm, or The thickness of the foam is more than 0 mm and less than 20 mm. The sports mat according to 〔1〕 or 〔2〕. 〔4〕 The heat-melted layer is formed between the outermost layer and the center layer, between the innermost layer and the center layer, or between the plurality of foams. The sports mat according to any one of 〔1〕 to 〔3〕. 〔5〕 Further comprising a central member, The central member is formed between the heat-melted layer and the foam, on the outermost surface (outermost layer side) of the center layer, or on the innermost surface (innermost layer side) of the center layer. The sports mat according to any one of 〔1〕 to 〔4〕. 〔6〕 The central member is a metal foil, an alloy foil, a resin sheet, a resin plate, a non-woven fabric sheet, or a metal mesh sheet, and is the competition mat according to any one of [1] to [5]. [7] The thickness of the central member is more than 0 mm and less than 20 mm, and is the competition mat according to any one of [1] to [6]. [8] Comprising one or more intermediate layers, The intermediate layer is formed between the outermost surface layer and the innermost surface layer, on the outermost surface (the outermost surface layer side) of the central layer or the central member, or on the innermost surface (the innermost surface layer side) of the central layer or the central member, and is the competition mat according to any one of [1] to [7]. [9] Convex and concave fitting portions are formed on four side portions of the competition mat, and two corner portions in one diagonal direction are inclined corner portions with an inclination angle of 45° with respect to the mat side portion, and two corner portions in the other diagonal direction are right-angled corner portions of 90°, and are formed symmetrically with respect to the diagonal, and are the competition mat according to any one of [1] to [8].

[10] The outermost surface layer and the innermost surface layer of the competition mat are provided with different colors from each other, and are the competition mat according to [9]. [Advantages of the Invention]

[0010] According to the present invention, since the central layer includes a foam and a heat-melt layer formed by heating and / or pressurizing the foam, the following unique effects can be exerted.

[0011] That is, according to the present invention, in martial arts and combat sports competitions, a fair and safe competition can be provided for competitors.

[0012] According to the present invention, since the competition mat has appropriate resilience, recoverability, ease of movement, etc., for a competitor who applies a technique, it is possible to significantly prevent the feet from digging into the mat, peeling, spraining, ligament damage, etc.

[0013] According to the present invention, since the competition mat has appropriate shock resistance, shock absorption, resilience, etc., for a competitor who receives a technique, it is possible to significantly prevent physical damage (sprain, dislocation, fracture, etc.) without receiving a strong impact on the body.

[0014] According to the present invention, since the competition mat has durability, economy, etc., for example, it is possible to significantly prevent mat elongation (creep), etc. that may occur due to the frequency of competitions such as standing techniques and ground techniques (especially), and long-term use.

[0015] According to the competition mat of the present invention, by using a flexible foam (especially a recycled foam) as much as possible without using hard materials such as wood and cardboard, while significantly improving the fairness, stability, and safety of the competition, durability, weight reduction, ease of handling, improvement in the utilization of recycled foam, economy, etc. can be achieved at a high level.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0017] 〔Definition〕 (Physical properties and measurement methods: Read as JIS standard K6767:1999 / 2019) In the present invention, the physical properties of the material (layer) constituting the competition mat and the measurement method thereof can be carried out based on the provisions of JIS standard K6767:1999. Therefore, the physical properties used in the present invention, that is, the apparent density (g / cm 3 ); compression stress-strain (25%: kPa); compression permanent strain (%); tensile strength (MPa) and tensile elongation (%); thermal stability (%); water absorption (g / cm 3 ); flammability; compression hardness; dynamic cushioning performance; compression creep; and thermal conductivity, etc. are measured according to the methods described in JIS standard K6767, and the measured values are used as numerical values. Therefore, all matters described in JIS standard K6767 and other JIS standards applied mutatis mutandis in JIS standard K6767 are incorporated herein.

[0018] (Hardness and its measurement method: JIS standard K7312:1999) In the present invention, the hardness and its measurement method are measured by the C-type hardness test defined in "7. Hardness test" in JIS standard K7312:1999, and the measured value (hardness) is used as a numerical value. Therefore, all matters described in JIS standard K7321 and other JIS standards applied mutatis mutandis in JIS standard K7321 are incorporated herein.

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

[0020] The "layer" means a component in the laminated structure, and without being restricted to the name, it is a concept that includes, for example, forms such as film, sheet, plate, foil, membrane, etc.

[0021] In the present invention, the "competition" relates to martial arts and combat sports, such as judo, jujutsu, karate, aikido, Shaolin boxing, self-defense techniques, ancient martial arts, wrestling, taekwondo, martial arts, etc.

[0022] 〔One embodiment of the present invention〕 One aspect of the present invention proposes a competition mat (laminated structure) comprising an outermost surface layer; an innermost surface layer; a central layer comprising one or more foams and one or more thermally fused layers.

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

[0024] As shown in FIGS. 1 and 2, the competition mat 1 is formed by a laminated structure. Specifically, as shown in FIG. 1(I), the surface of the competition mat 1 is composed of the outermost surface layer 11A, and the back surface of the competition mat 1 is composed of the outermost surface layer 11B. Further, between the outermost surface layer 11A and the outermost surface layer 11B, a central layer 14 (and a central member 15 as required) is laminated.

[0025] According to a preferred embodiment of the present invention, as shown in FIG. 1(II), between the outermost surface layer 11A and the outermost surface layer 11, and between the outermost surface layer 11A and the outermost surface layer 11 and the central layer 14 and / or the central member 15, a competition mat is proposed in which an optional layer, for example, one or a plurality of intermediate layers (the Nth intermediate layer) is laminated.

[0026] Specifically, as shown in FIG. 1(II), the first intermediate layer 12A and the first intermediate layer 12B may be laminated inside the outermost surface layer 11A and the innermost surface layer 11B, respectively (that is, on the side of the central layer 14 or the central member 15). Further, the second intermediate layer 13A and the second intermediate layer 13B may be laminated inside the first intermediate layer 12A and the first intermediate layer 12B, respectively (that is, on the side of the central layer 14 / central member 15). Of course, the first intermediate layer 12 and the second intermediate layer 13 may have a reverse laminated structure. Thus, the competition mat 1 according to the present invention is a laminated structure composed of a plurality of constituent layers (materials).

[0027] 〔Central layer〕 According to the present invention, as shown in FIG. 1(I), a central layer 14 including one or a plurality of heat-melted layers 14A m and one or a plurality of foams 14B n is provided, and the heat-melted layer 14A m is formed by heating and / or pressurizing the foam 14B n . In the present invention, preferably, the heat-melted layer 14A m is formed between the outermost surface layer 11A and the foam 14B n , between the innermost surface layer 11B and the foam 14B n , or between the plurality of foams 14B n , and a competition mat 1 is proposed.

[0028] According to a preferred embodiment of the present invention, in one or a plurality of heat-melted layers 14A m , 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. Also, one or a plurality of foams 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 thermally melted layer 14A m and the foam 14B n In the central layer 14 including, the number m and the number n may be the same (preferred) or different.

[0029] <Thickness> The thickness of the central layer 14 can be appropriately determined in consideration of the thickness of the competition mat 1 (usually 5 cm or 6 cm), the thickness of the outermost layer 11A, the innermost layer 11B, the thickness of any layer (the Nth intermediate layer), etc. The lower limit is more 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 is less than 5 cm or less than 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 thermally melted layer 14A that constitutes the central layer 14 m and the thickness of the foam 14B n can also be determined in consideration of the thickness of the competition mat and the thickness of the intermediate layer described above. As a preferred embodiment, the thickness of one foam 14B n is 1 to 10 times, preferably 1.5 to 8 times the thickness of one thermally melted layer 14A m may be.

[0031] (Thermally melted layer 14A m ) In the present invention, the thermally melted layer 14A m may be formed by heating and / or pressing the foam 14B n . Heating and pressing are prepared by heating and / or pressing near the melting temperature of the foam B n . According to a preferred embodiment of the present invention, near the melting temperature of the foam 14B n , the surface of the foam 14B n is heated and melted and / or pressure melted, and then, another foam 14B nIt can be formed by laminating the outermost layer 11A, the innermost layer 11B, and any arbitrary layer, and then applying appropriate pressure for crimping. Foam 14B n By heating and / or applying pressure to the foam 14B n A heat-melt layer 14A can be easily formed on the surface m In the lamination with the outermost layer 11A or the innermost layer 11B, it is possible to propose a competition mat provided with an intermediate layer 14 having desired physical property values without using an adhesive or other adhesion methods.

[0032] <Thickness> Heat-melt layer 14A m The thickness of the heat-melt layer 14A can be appropriately determined in consideration of the thickness of the competition mat 1 (usually 5 cm or 6 cm), the thicknesses of the outermost layer 11A, the innermost layer 11B, and any arbitrary layer (the Nth intermediate layer), etc. The lower limit value is more than 0 mm, preferably 0.1 mm or more, more preferably 0.5 mm or more, the upper limit value is 10 mm or less, preferably 5 mm or less, and more preferably 1 mm or less.

[0033] (Foam 14B n ) Foam 14B n May be the same or different. Also, the foam 14B n Is the synthetic resin 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), polysilicon (SI), polyimide (PI), melamine resin (MF), fluororesin (PF), and preferably, it can be formed from those selected from polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), phenol resin (PF), and polyvinyl chloride (PVC).

[0034] According to another preferred embodiment, when forming a foam by a synthetic resin and a foaming agent (foaming method), an inorganic substance (filler, hollow beads, etc.) may be added and prepared to exhibit desired physical property values.

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

[0036] 〔Central member〕 According to a preferred embodiment of the present invention, as shown in FIGS. 1 and 2, the central layer 14 may include a central member 15. The central member 15 is the thermally melted layer 14A that constitutes the central layer 14 m and the foam 14B n It may be formed between them, on the outermost surface of the central layer 14 (on the side of the outermost surface layer 11A), or on the innermost surface of the central layer 14 (on the side of the innermost surface layer 11B), and is preferably formed at the center of the central layer 14.

[0037] <Member> The central member 15 is preferably a metal (alloy) foil (foil), for example, aluminum foil, stainless foil, etc. are preferably used. The metal (alloy) foil has less deformation in the horizontal direction of the competition mat and can more significantly prevent creep (lateral elongation) of the competition mat 1. In addition, since the central member (foil material) 15 is made of a thin metal foil, the effect as a lightweight creep (lateral elongation) prevention material can be exerted at a high level.

[0038] According to a preferred embodiment of the present invention, the central member 15 may be made of a high-hardness organic member, for example, a resin sheet or a resin plate (plate material). The organic member may be formed of the above-described synthetic resin, and may be used even if it is formed in a foamed form or a hollow form. Further, as the central member 15, organic fibers such as para-aramid fibers (for example, Kevlar fabric (registered trademark)), a resin nonwoven fabric sheet with little deformation and high hardness, or a metal mesh sheet can also be used. From the above, the central member 15 may be a resin sheet, a resin plate, a nonwoven fabric sheet, a metal mesh sheet, or the like, and can significantly prevent creep (lateral elongation) of the competition mat 1.

[0039] <Thickness> The thickness of the central member 15 can be appropriately determined in consideration of the thickness of the competition mat 1 (usually 5 cm or 6 cm), the thickness of the outermost surface layer 11A, the innermost surface layer 11B, an optional layer (the Nth intermediate layer), etc. The lower limit value exceeds 0 mm, preferably 0.1 mm or more, more preferably 0.5 mm or more, the upper limit value is less than 2 mm, preferably 1.5 mm or less, and more preferably 1 mm or less.

[0040] (Physical properties of the central layer 14: Conforming to JIS standard K6767:1999) In the present invention, the physical properties of the central layer 14 constituting the competition mat are measured based on the provisions of JIS standard K6767:1999 and used as the measured values.

[0041] By setting the specific physical properties of the central layer 14 within the following numerical ranges, it is possible to significantly improve the fairness, stability, and safety of the competition, and to propose a competition mat excellent in resilience, recovery, ease of operation, impact resistance, shock absorption, resilience, durability, weight reduction, ease of handling, economy, etc.

[0042] (Apparent density) The apparent density of the central layer 14 is 0 g / cm 3 Exceeding 0.20 g / cm 3 The following, preferably the upper limit value is 0.20 g / cm 3 The following. (Tensile strength) The tensile strength of the central layer 14 is more than 0 MPa and 2.0 MPa or less, preferably the upper limit is 1.5 MPa or less, and more preferably the upper limit is 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 the lower limit is 3.0 N / mm or more, the upper limit is 5.0 N / mm or less, and more preferably the lower limit is 3.5 N / mm or more, the upper limit is 4.5 N / mm or less. (Compressive stress) The compressive stress (25%) of the central layer 14 is 100 kPa or more and 200 kPa or less, preferably the lower limit is 130 kPa or more, the upper limit is 180 kPa or less, and more preferably the upper limit is 140 kPa or more, the upper limit is 170 kPa or less. (Compressive permanent strain) The compressive permanent strain of the central layer 14 is more than 0% and 5.0% or less, preferably the lower limit is 1.0% or more, the upper limit is 4.0% or less, and more preferably the upper limit is 2.0% or more, the upper limit is 3.0% or less. (Dimensional change upon heating) The dimensional change upon heating of the central layer 14 is -2.0% or more and 2.0% or less, preferably the lower limit is -1.5% or more, the upper limit is 1.5% or less, and more preferably the upper limit is -1.0% or more, the upper limit is 1.0% or less. (Water absorption) The water absorption of the central layer 14 is more than 0 g / cm 3 and 0.0005 g / cm 3 or less, preferably the lower limit is 0.0001 g / cm 3 or more, the upper limit is 0.0004 g / cm 3 or less, and more preferably the upper limit is 0.0002 g / cm 3 or more, the upper limit is 0.0003 g / cm 3 or less.

[0043] Outermost layer 11A and innermost layer 11B In the present invention, the surface on which an athlete competes on the competition mat is defined as the outermost layer 11A, while the other surface that is in contact with the installation location of the competition mat (e.g., the floor) instead of the athlete competing on the competition mat can be defined 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 configured in the same form. In this case, depending on the installation location, it may be the front or the back. Also, as will be described later, by differentiating according to the form (shape, pattern, color) of the outermost surface, either of them may be used as the outermost layer 11A or the innermost layer 11B. Therefore, according to a preferred embodiment of the present invention, when the competition mat can be used on both sides, i.e., reversibly, 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 made of the synthetic resin 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), polysilicon (SI), polyimide (PI), melamine resin (MF), fluororesin (PF). Preferably, those formed from the ones selected from polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), phenolic resin (PF), and polyvinyl chloride (PVC) can be used. 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. Also, the thicknesses of the outermost layer 11A and the innermost layer 11B can be appropriately determined in consideration of the thickness of the sports mat 1 (usually 5 cm or 6 cm), the thicknesses of the outermost layer 11A, the innermost layer 11B, any intermediate layer (the Nth intermediate layer), etc., and are more than 0 mm and 10 mm or less. The lower limit value is preferably 0.3 mm or more, more preferably 0.5 mm or more, and the upper limit value is preferably 5 mm or less, more preferably 1 mm or less.

[0047] (Lamination) 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 the central layer 14 (and the central member 15), they may be laminated by thermocompression bonding or adhesion with an adhesive.

[0048] (Convex and concave 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 fine convex and concave processing. The convex and concave processing is, for example, embossing in a tatami pattern imitating a judo mat, which has good motility (e.g., foot movement property) when performing a sliding foot movement and can exhibit an appropriate anti-slip effect.

[0049] The convex and concave processing can be performed by a method of inserting an organic resin into a convex and concave mold when forming the outermost layer 11A and the innermost layer 11B; a method of pressing a heated convex and concave plate against the outermost surfaces of the outermost layer 11A and the innermost layer 11B; or a method of performing convex and concave embossing on the outermost surfaces with a heated embossing roll; etc.

[0050] (Color) The outermost layer 11A and the innermost layer 11B can be colored with different colors from each other. For example, a portion where the outermost layer 11A colored with one color (e.g., blue) is laid as the front is regarded as a so-called in-field portion, and a portion where the innermost layer 11B colored with another color (e.g., red or pink) is laid as the front is regarded as a so-called out-of-field portion, etc. By distinguishing the outermost layer 11A and the innermost layer 11B based on the difference in color, even if both have the same configuration and function, the competition section, competition position, etc. can be clearly shown and distinguished. In this sense, in the above embodiment, it goes without saying that the innermost layer 11B functions as the outermost layer 11A, or the outermost layer 11A functions as the innermost layer 11B.

[0051] 〔Optional layer〕 According to a preferred embodiment of the present invention, an optional layer, for example, one or more intermediate layers (the Nth intermediate layer), etc. may be laminated. Specifically, the first intermediate layer 12 (12A and 12B) and / or the second intermediate layer 13 (13A and 13B) shown in FIG. 1(II) may be provided. 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 laminating an optional layer, 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 the 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 the central member 15.

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

[0054] According to a preferred embodiment of the present invention, the first intermediate layer 12 is preferably made of a material having a lower hardness and showing flexibility as compared with the second intermediate layer 13. As a result, the first intermediate layer 12 is superior in shock absorbency as compared with the second intermediate layer 13, and when a competitor applies a technique, or when a competitor is thrown down after being attacked with a technique, the first intermediate layer 12 can preferably absorb the shock to ensure the safety of the competitor.

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

[0056] According to a preferred embodiment of the present invention, the second intermediate layer 13 is preferably made of a material having a higher hardness and higher rigidity as compared with the first intermediate layer 12. As a result, the second intermediate layer 13 is superior in vertical resilience, ensures the footwork when a competitor moves in a standing position (shuffling), maintains the vertical strength of the competition mat 1, and can preferably prevent creep (lateral elongation).

[0057] (Foam: synthetic resin) The first intermediate layer 12 and the second intermediate layer 13 are the synthetic resins 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), polysilicon (SI), polyimide (PI), melamine resin (MF), fluororesin (PF), preferably selected from the group consisting of polyurethane (PUR), polystyrene (PS), polyethylene (PE), polypropylene (PP), phenol resin (PF), and polyvinyl chloride (PVC), and more preferably a structure (foam) composed of a resin selected from the group consisting of polystyrene (PS), polyethylene (PE), and polypropylene (PP).

[0058] The first intermediate layer 12 (the first intermediate layer 12A and the first intermediate layer 12B) and the second intermediate layer 13 (the second intermediate layer 13A and the second intermediate layer 13B) may each be a sheet, a plate, or a 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 than the first intermediate layer 12.

[0060] The hardness of the second intermediate layer 13 may be configured in a manner that varies depending on the type of the target sport and the level of the athlete (skills, level class, weight, etc.). For example, in the case of a lightweight class, the hardness may be low, and in the case of a heavyweight class, the hardness may be high.

[0061] For example, when the sports mat 1 is for judo and karate, in the case of general use or standard specifications, a hardness of 50 degrees is sufficient. For lightweight classes (from infants to lower grades of elementary school: for example, around 40 kg) and beginners, the hardness may be 40 degrees, or when it is a sports mat for super heavyweight classes (for example, over 100 kg) and advanced athletes, the hardness may be adjusted to 60 degrees.

[0062] Also, the hardness and thickness of the first intermediate layer 12 and the second intermediate layer 13 can be arbitrarily combined 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 with a hardness of 40 degrees and the first intermediate layer 12A and the first intermediate layer 12B with a hardness of 40 degrees, a sports mat 1 with excellent shock absorption can be provided. Also, for intermediate users, by preparing the second intermediate layers 13A and 13B with a hardness of 40 degrees and the first intermediate layers 12A and 12B with a hardness of 55 degrees, it is possible to provide the competition mat 1 that maintains the desired shock absorbency, ensures stability, and enhances the anti-creep function. Furthermore, for advanced users, by preparing the second intermediate layers 13A and 13B with a hardness of 60 degrees and the first intermediate layers 12A and 12B with a hardness of 55 degrees, it is possible to provide the competition mat 1 that enhances stability and the anti-creep function.

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

[0065] 〔Preferred Another Embodiment〕 FIG. 4 is a plan view of the competition mat 20 according to a preferred embodiment of the present invention. Also, as shown in FIG. 4, the competition mat 20 may be provided with an outermost surface layer 201 (outermost surface layers 201A and 201B) having random matte pattern unevenness on the surface. The outermost surface layers 201A and 201B may be the same as the above-described outermost surface layer 11 (outermost surface layers 11A and 11B) except that unevenness processing is performed.

[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, except for use in official competitions at home and abroad, it may be designed and prepared to be 1.5 cm or more and 5 cm or less or 6 cm or less according to the competition content, the class and level of the competitors.

[0067] As shown in Fig. 1(II), the thickness T of the second intermediate layers 13A and 13B can be approximately 5 mm each, and the thickness t of the first intermediate layers 12A and 12B can be approximately 4 mm or more and 5 mm or less each. Also, in accordance with the characteristics required for the competition mat, the thickness of the competition mat 1 may also be prepared to be 4 mm or more and 15 mm or less.

[0068] (Hardness) The hardness of the foams (e.g., polyethylene foam) constituting the first intermediate layers 12A and 12B or the second intermediate layers 13A and 13B may be identified as the particle density of polyethylene. The first intermediate layers 12A and 12B may be integrally adhered and fixed to the second intermediate layers 13A and 13B with an adhesive. An appropriate amount of an adhesive (e.g., a rubber-based adhesive, a synthetic resin-based adhesive, etc. on the plate surface) can be applied, and these can be pressure-bonded and dried to be integrated.

[0069] (Thickness: embossing) In another aspect shown in Fig. 4, the surfaces of the outermost layer 201A and the innermost layer 201B are formed with randomly and densely arranged small anti-slip convex portions. The diameter of the convex portions is approximately 0.2 mm or more and 0.5 mm or less, and the convex portions are formed on the film at intervals of 0.2 mm or more and 0.5 mm or less, forming randomly arranged (without direction regularity) anti-slip convex portions.

[0070] The anti-slip convex portions form fine anti-slip unevenness by embossing, which is also called so-called dimpling or satin finishing. Next, by integrally attaching and adhering the processed outermost layer 201A and the outermost layer 201B to the first intermediate layers 12A and 12B, it is possible to significantly prevent deterioration such as creep and elongation of the competition mat 20 due to long-term use.

[0071] [Another preferred embodiment] In an embodiment according to the present invention, particularly in the embodiment shown in FIG. 4, a competition mat 20 is shown in which a topmost surface layer 201A and a bottommost surface layer 201B with anti-slip protrusions on the outer plate surface are adhered. On the other hand, in another embodiment (not shown) of the present invention, on the upper and lower surfaces of a second intermediate layer 13A and a second intermediate layer 13B formed of (polyethylene) foam, a first intermediate layer 12A and a first intermediate layer 12B of (polyethylene) foam having a different hardness from the second intermediate layer 13A and the second intermediate layer 13B are adhered, and further, anti-slip protrusions are formed directly on the surfaces of the first intermediate layer 12A and the first intermediate layer 12B at random intervals. The anti-slip protrusions on the surfaces of the first intermediate layer 12A and the first intermediate layer 12B can also be formed by pressing a heat-formed uneven pattern against the surfaces of the first intermediate layer 12A and the first intermediate layer 12B and performing uneven embossing on the surfaces of the first intermediate layer 12A and the first intermediate layer 12B using a heated embossing roll.

[0072] 〔Second Embodiment of the Present Invention〕 The competition mat 30 according to the second embodiment of the present invention will be described with reference to FIGS. 5 to 7.

[0073] FIG. 5 is a view of the competition mat 30 according to the present invention as seen from above. The laminate structure of the mat of the competition mat 30 shown in FIG. 5 is the same as the laminate structure of the competition mat 1 (see FIG. 1) according to the first embodiment, and thus the description thereof will be omitted.

[0074] A plurality of fitting portions 301 (fitting portion 301A and fitting portion 301B) having an uneven shape are formed on the outer sides of the four sides of the competition mat 30. As will be described later, the concave (convex) fitting portion 301A of one competition mat 30 adjacent to the side portions and the convex (concave) fitting portion 301B of the other competition mat 30 having the same shape corresponding thereto are tightly fitted, whereby the competition mats 30 are connected to each other, and in this way, a competition section of a predetermined area is formed. Of course, the uneven-shaped fitting portions formed on the side portions are not limited to the illustrated form.

[0075] Two of the corners of the square-shaped competition mat 30 along one diagonal A are cut at right angles to this diagonal A, that is, they are the inclined corner parts 302A and 302B that are inclined at 45° with respect to the outer part of the competition mat 30. Also, the two corners of the competition mat 30 along the other diagonal direction are right-angled corners, that is, the right-angled corner parts 303A and 303B. The two inclined corner parts 302A and 302B along the one diagonal A have the same shape, and the other two right-angled corner parts 303A and 303B also have the same shape as each other. Therefore, this mat 30 is formed symmetrically with respect to the diagonal A.

[0076] FIG. 6 is a schematic view seen from above of a competition-connected floor mat in which competition mats according to the second embodiment of the present invention are connected to each other. The competition-connected floor mat 40 shown in FIG. 6 is formed by concavo-convex fitting and connecting competition mats 30, 31, 32, 33, 34, etc. that have the same shape as each other. In FIG. 6, on the left and right and upper and lower side parts of the competition mat 30, the right side part of the competition mat 31, the left side part of the competition mat 32, the lower side part of the competition mat 33, and the upper side part of the competition mat 34, which have the same shape as each other, are arranged.

[0077] In the competition-connected floor mat 40 connected in this way, the shapes of the corner parts of each competition mat 30, 31, 32, 33, 34, etc. are the same in the diagonal direction. Therefore, for example, only one competition mat 30 can be turned over and fitted and installed as it is. When turning it over, for example, in FIG. 2, taking one diagonal A as an imaginary axis and rotating the central competition mat 30 180° around this diagonal A, the back surface of the mat will appear on the front side. Thus, the competition mat 30 according to the second embodiment can be freely selected for the front and back surfaces and installed on the floor surface. And the surface properties (material, shape of fine unevenness) of the front and back surfaces of the mat can be made the same, and different colors can be applied to the front and back surfaces.

[0078] FIG. 7 is a diagram showing an example of use of a competitive connecting floor mat in which competitive mats according to the second embodiment of the present invention are connected to each other. FIG. 7 shows an example in which a competitive mat 30 having different colors on the front and back surfaces is connected to form a competitive connecting floor mat 40. FIG. 7(a) shows the configuration of a competitive mat for karate in a kata competition (with standing position display) in which two players fight against each other, and FIG. 7(b) shows the configuration of a competitive mat used in a kata competition in which one player demonstrates a form in judo or karate.

[0079] In the second embodiment (example), an example in which the layer formed of the synthetic resin foam consists of a pair of first intermediate layers 12 and second intermediate layers 13 is shown, but the number of layers formed of the synthetic resin foam may be increased. On the other hand, the number of constituent layers may be reduced, such as reducing the layer formed of the synthetic resin foam to only the first intermediate layer.

[0080] In a preferred embodiment of the present invention, an example in which a central member (foil) 15 is sandwiched between the central layers 14 and further sandwiched and adhered by the first intermediate layers 12 and the second intermediate layers 13 is shown. Of course, in the present invention, for example, the central member (foil) 15 may be sandwiched and adhered between the first intermediate layer 12 and the second intermediate layer 13 or the like. In this case, it is possible to significantly prevent the occurrence of creep (lateral expansion) of the competitive mat.

[0081] 〔Usage mode〕 The above-described embodiment of the present invention can be used, for example, as a competitive connecting floor mat laid on the floor surface of a competition room for performing martial arts competitions such as judo, karate, aikido, Shaolin boxing, and wrestling. Preferably, it is preferably used as a competitive mat for use in judo (in particular), wrestling, and the like.

[0082] The surface forms of the outermost surface layer 11A and the outermost back layer 11B of the competitive mat 1 in the present invention are substantially the same, and may be rectangular (for example, in the case of the judo competition rules of the Kodokan: length × width = 182 cm × 91 cm, and the international judo standard: length × width = 200 cm × 100 cm) or square (for example, the international judo standard: side = 100 cm (half tatami)).

[0083] In one embodiment of the present invention, the competition mat 1 having a substantially square planar shape with sides of about 1 m may be laid such that a plurality of them are adjacent to each other in the X and Y directions (left - right, up - down directions) of the competition hall floor to form a competition mat unit and constitute a competition floor with a desired area.

[0084] 〔Technical significance: Effects of the invention) The competition mats 1, 10, 20 according to the present invention are composed of a plurality of (polyethylene) foams with different strengths, including the outermost surface layers 11A and 11B, 101, 201A, 201B of the outer surface. From this, the impact absorbency is improved, and it is possible to significantly prevent serious impact accidents caused by falls during combination strikes, leg sweeps, or throwing techniques during the competition.

[0085] For example, during the competition, the running ability of the competitor varies depending on the vertical and horizontal directions like the conventional tatami surface pattern and grid pattern. It is possible to significantly prevent accidents such as the toenails getting caught in a certain direction, resulting in toenail peeling and damage. Also, for example, due to the random (direction - irregular) small - granular embossed surfaces of the outermost surface layer 201A and the innermost surface layer 201B, an appropriate frictional function is exhibited, there is no excessive slipperiness or excessive adhesiveness, and the running ability required for the competition is ensured.

[0086] According to another aspect of the present invention, by preparing competition mats 1, 10, 20 with variable strength in the range of 40 degrees or more and 60 degrees or less, it is possible to exhibit the convenience that an appropriate hardness according to the skill level of the competitor can be freely selected and easily replaced and used. Such ease of replacement can prevent head injuries due to falls even for beginners, and can prevent or avoid in advance and significantly the various problems such as physical damage such as excessive sinking even in the case of heavy - weight competitors.

Explanation of reference numerals

[0087] 1 Competition mat 11A Outermost surface layer 11B Innermost surface layer 12 First intermediate layer 13 Second intermediate layer 14 Central layer 14A Heat-melt layer 14B Foam 15 Central member 20 Competition mat 101 Outermost surface layer / Innermost surface layer 201A Outermost surface layer 201B Innermost surface layer 30 Competition mat 301 Fitting part 302 Inclined angle part 303 Right-angle part 40 Competition-connected floor mat

Claims

1. A competition mat, comprising: An outermost layer; An innermost layer; A center layer having one or more foams and one or more heat - melted layers; The heat - melted layer is formed by heating and / or pressurizing the foam, The heat - melted layer is formed between the outermost layer and the center layer, between the innermost layer and the center layer, or between the plurality of foams, a competition mat.

2. The apparent density of the center layer is more than 0 g / cm ３ and less than or equal to 0.20 g / cm ３ The tensile strength of the center layer is more than 0 MPa and less than or equal to 2.0 MPa, The tensile elongation of the center layer is less than 200%, The tear strength of the center layer is from 2.5 N / mm to 5.5 N / mm, The compressive stress (25%) of the center layer is from 100 kPa to 200 kPa, The compressive permanent set of the center layer is more than 0% and less than or equal to 5.0%, The dimensional change due to heating of the center layer is from - 2.0% to 2.0%, or The water absorption rate of the center layer is more than 0 g / cm and less than or equal to 0.0005 g / cm ３ The competition mat according to claim 1. ３

3. The thickness of the heat - melted layer is more than 0 mm and less than or equal to 1 mm, or The thickness of the foam is more than 0 mm and less than 20 mm, the competition mat according to claim 1 or 2.

4. The heat - melted layer is formed between the outermost layer and the center layer, between the innermost layer and the center layer, or between the plurality of foams, the competition mat according to any one of claims 1 to 3.

5. Further comprising a central member, The central member is configured between the heat-melt layer and the foam, on the outermost surface (the outermost surface layer side) of the central layer, or on the innermost surface (the innermost surface layer side) of the central layer, for the sports mat according to any one of claims 1 to 4.

6. The central member is a metal foil or alloy foil, a resin sheet, a resin plate, a non-woven fabric sheet, or a metal mesh sheet, for the sports mat according to any one of claims 1 to 5.

7. The thickness of the central member is more than 0 mm and less than 20 mm, for the sports mat according to any one of claims 1 to 6.

8. Comprising one or more intermediate layers, The intermediate layer is configured between the outermost surface layer and the innermost surface layer, on the outermost surface (the outermost surface layer side) of the central layer or the central member, or on the innermost surface (the innermost surface layer side) of the central layer or the central member, for the sports mat according to any one of claims 1 to 7.

9. Convex and concave fitting portions are formed on four side portions of the sports mat, and two corner portions in one diagonal direction are inclined corner portions with an inclination angle of 45° with respect to the mat side portion, and two corner portions in the other diagonal direction are right-angle corner portions of 90°, and are formed symmetrically with respect to the diagonal, for the sports mat according to any one of claims 1 to 8.

10. The outermost surface layer and the innermost surface layer of the sports mat are provided with different colors from each other, for the sports mat according to claim 9.

Images