| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin Tatami mat substrate which exerts sufficient bending rigidity and insusceptible to environmental fluctuation such as temperature and moisture, and to provide a thin Tatami mat having the thin Tatami mat substrate. SOLUTION: According to the structure of the Tatami mat, a core (1) is formed of a polyolefin resin rigid foam which has bubbles orientated in a thickness direction ("Zetron" manufactured by Sekisui Chemical Co., Ltd., having a thickness of 7 mm), and a cushion layer (8) formed of a polyethylene foam having a thickness of 2 mm ("Pef" manufactured by Toray Co., Ltd., having an expansion ratio of 30 times) is arranged on the core (1). Further a paper board having a thickness of 2 mm ("MF Sheet" manufactured by Marusan Paper MFG. Co., Ltd.) is laid on a lower surface of the core (1) as the paper board (4), and a craft paper polypropylene cloth 10×10 (manufactured by Sumoto Paper Co., Ltd.) is arranged under the paper board (4) as a rear sheet (5). Then all the Tatami mat components are stitched together in one body with threads (6) at a stitch interval of 40 mm and a feeding pitch of 50 mm, by using a Tatami mat manufacturing machine ("Chemi Pet" manufactured by Kyokuto Sanki Co., Ltd.). In this manner the thin Tatami mat substrate of a 3×6 board (910×1,820 mm) is manufactured. COPYRIGHT: (C)2008,JPO&INPIT
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