JPH075667U - Tatami mats for judo - Google Patents

Abstract

(57) [Abstract] [Purpose] Achieve moderate elasticity and maintain it for a long time. [Structure] A polypropylene corrugated sheet 12a and polyethylene foams 13a and 13b are provided on an upper part of a polystyrene foam 11 for tatami floor, and a polypropylene corrugated sheet 12b and a polyethylene foam 13a are provided on a lower part thereof. The polyethylene foams 13a and 13b realize appropriate elasticity, and the corrugated cardboard sheets 12a and 12b disperse the impact load, and prevent the polystyrene foam 11 from causing permanent set.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tatami mat for a judo, which is composed mainly of a plastic material, has appropriate elasticity, and has excellent durability.

[0002]

[Prior art]

 Judo is a sport where you practice and play in a tatami mat dojo or a game field.

As a conventional tatami mat for judo, a tatami mat made of rice straw is used on the surface of a tatami mat, which is similar to a tatami mat for general households. However, the tatami mats attached to both side edges in the longitudinal direction of the tatami mat are usually omitted by omitting this and bending the entire circumference of the tatami mat to the back side of the tatami mat to complete the entire mat. This is because the tatami mat may get caught in the leg during the match.

Although a polystyrene foam for tatami floors is commercially available for use in tatami mats for general household use (JIS A 5911), this one is insufficient in compression hardness and is easily It is not suitable for judo tatami mats due to permanent set.

[0005]

[Problems to be solved by the device]

 According to such a conventional technique, the tatami floor is formed by compressing rice straw firmly and strongly compacting it through a twine, etc., but it is difficult to maintain an appropriate elasticity for a long period of time, and it is durable. The problem of being inferior to I was inevitable. In addition, since the tatami mat is made of organic matter, it often causes mold and rot during the rainy season when it is hot and humid.

In view of the above problems of the prior art, the object of the present invention is to provide a commercially available polystyrene foam material for tatami mat as a base material and to provide a reinforcing layer on both surfaces of the foam material so that appropriate elasticity can be maintained for a long time. It is to provide a tatami mat for Judo that can be maintained for a long time and has excellent durability.

[0007]

[Means for Solving the Problems]

 The structure of the present invention to achieve such an object is a tatami floor formed by providing a reinforcing layer composed of a polypropylene corrugated sheet and a polyethylene foam above and below a polystyrene foam for a tatami floor, and a heat-resistant polypropylene foam sheet. The main point is that it consists of a vinyl chloride tatami mat that covers the upper surface of the tatami floor through the.

[0008]

[Action]

 According to the structure of the present invention, the polyethylene foam can easily realize an appropriate compression hardness, and the polypropylene corrugated cardboard sheet has a large rigidity, so that the impact load is widely dispersed and the polystyrene foam is expanded. It can be transmitted to the body. Therefore, the polystyrene foam does not easily cause permanent set, and the whole can maintain proper elasticity for a long period of time. Since the polypropylene foam sheet has high heat resistance, even if the tatami mat surface slips on the tatami mat floor, the both will not be welded.

[0009]

【Example】

 Hereinafter, embodiments will be described with reference to the drawings.

A tatami mat for judo comprises a tatami mat 10 and a tatami mat 21 covered with a polypropylene foam sheet 22 (FIGS. 1 and 2).

In the tatami floor 10, a polypropylene corrugated sheet 12a and polyethylene foams 13a and 13b are arranged on an upper portion of a polystyrene foam 11 for the tatami floor, and a polypropylene corrugated sheet 12b and a polyethylene foam sheet are formed on a lower portion thereof. A body 13a is provided.

[0012] The polystyrene foam 11 is based on JIS A 5911, and for example, a polystyrene foam heat insulating material Mirafoam M3T for building material tatami floor made by JSP Corporation can be used. The physical properties of this product are a density of about 28 kg / m ³ , a bending strength of about 6.1 kg / cm ² , and a compressive strength of about 2.8 kg / cm ² at a specified strain of 0.05. The thickness is 22 mm.

The corrugated cardboard sheets 12a and 12b are, for example, hollow plastic structural plate damper plates A-5 and A-3 manufactured by Ube Nitto Kasei Co., Ltd., and their plane compressive strength is 5.6 kg / cm ^2. It is 4.1 kg / cm ² . The thickness of the corrugated board sheets 12a and 12b is 5 mm and 3 mm, respectively.

The polyethylene foam 13a is an industrial foam product PE-Lite L-5 manufactured by Inoac Corporation. The compression hardness of this product at 25% strain is 0.43 kg / cm ² , and the compression set at that time is 2.9%. The thickness of each of the polyethylene foams 13a and 13a is 10 mm.

The polyethylene foam 13b is PE-Lite L-10 manufactured by the same company, and has a compression hardness of 1.34 kg / cm ² and a compression set of 2.5%. The thickness is 5 mm.

A hessian cloth 14 is attached to the lowermost surface of the tatami floor 10. Further, the tatami floor 10 is stacked and compacted by piercing the binding yarns 15 vertically at a predetermined pitch (FIG. 2).

The tatami mat 21 covers the tatami floor 10 from the upper surface thereof with a polypropylene foam sheet 22 interposed therebetween. However, the foamed sheet 22 is, for example, a 30-fold product of a non-crosslinked polypropylene foamed sheet P mat manufactured by JSP Corp., and its heat resistant temperature is 140 ° C. and its thickness is about 1 to 5 mm. For the tatami mat 21, for example, vinyl chloride tatami mat gold manufactured by Okamoto Co., Ltd. is used. However, the tatami mat 21 may use the red made by the same company for outside use. The tatami mat 21 has a knitting pattern formed on its front surface and a suitable reinforcing lining on its back surface.

The tatami mat 21 extends to the back surface so as to wrap around the side edge of the tatami floor 10 and is fixed to the back surface of the tatami floor 10 via a binding thread 23.

The judo tatami having such a structure exhibits appropriate elasticity when a large impact load is applied to the upper surface of the tatami mat 21 because the polyethylene foams 13b, 13a, 13a have appropriate compression hardness. . Further, since the impact load at that time is widely dispersed due to the rigidity of the corrugated cardboard sheets 12a and 12b, the polystyrene foam 11 is less likely to cause permanent distortion and can maintain appropriate elasticity for a long time. That is, the corrugated cardboard sheet 12a, the polyethylene foams 13a and 13b, which are disposed on the upper part of the polystyrene foam 11, and the corrugated cardboard sheet 12b and the polyethylene foam 13a, which are disposed below the polystyrene foam 11, respectively function as reinforcing layers for the polystyrene foam 11. can do.

Further, the polypropylene foam sheet 22 interposed between the tatami floor 10 and the tatami mat 21 prevents the tatami mat 21 from slipping even when a large horizontal force is applied to the tatami mat 21, Even if it slips, the tatami mat 21 and the polyethylene foam 13b are effectively prevented from being welded to each other.

Further, the total weight thereof is about 30% of that of a conventional tatami mat made of rice straw, which is extremely lightweight. Furthermore, the compression set due to impact is about 1/2 that of a conventional tatami mat made of rice straw and about 1/5 to 1/6 that of a chemical tatami mat made of polystyrene foam 11. Therefore, the durability of a tatami mat for judo can be guaranteed for 10 years or more, compared to about 3 to 4 years for a conventional tatami mat made of rice straw.

[0022]

[Other Examples]

 In the tatami floor 10, the polyethylene foam 13a on the back side can be thinned and two layers of polyethylene foam 13a, 13a can be provided on the front side (FIG. 3). Since the surface side polyethylene foams 13a, 13a have a low compression hardness and are soft, they serve as a good cushioning material against an excessive impact load, and as a whole, can realize a better cushioning property. it can.

In the above description, the characteristic values and thickness of each member forming the tatami floor 10 are examples, and may be appropriately changed as long as appropriate elasticity and durability can be realized. Good

[0024]

[Effect of device]

 As described above, according to the present invention, by providing the reinforcing layer composed of the polypropylene corrugated sheet and the polyethylene foam above and below the polystyrene foam for tatami mat, the reinforcing layer realizes an appropriate elasticity. At the same time, permanent deformation of the polystyrene foam is effectively prevented, so that it is possible to maintain an appropriate elasticity for a long period of time, and it has an excellent effect that the durability is extremely good.

Further, since it is entirely made of a plastic material, it is lightweight and has extremely excellent sanitary properties including mold resistance.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view

[Fig. 2] Cross-sectional view of main parts

FIG. 3 is a view corresponding to FIG. 2 showing another embodiment.

[Explanation of symbols]

 10 ... tatami floor 11 ... polystyrene foam 12a, 12b ... polypropylene corrugated board sheet 13a, 13b ... polyethylene foam 21 ... tatami mat 22 ... polypropylene foam sheet

Claims (1)

[Scope of utility model registration request] 1. A tatami floor formed by providing a reinforcing layer made of a polypropylene corrugated sheet and a polyethylene foam above and below a polystyrene foam for tatami floor, and an upper surface of the tatami floor through a heat-resistant polypropylene foam sheet. A tatami mat for Judo consisting of a vinyl chloride tatami mat covering the.