| 摘要 |
PROBLEM TO BE SOLVED: To provide a tube, which can be crushed to leave no gap, which has excellent restoration performance, which is not permanently set after repeated ironing action, and which has excellent chemical resistance to fluid. SOLUTION: This tube comprises an inner layer 11 comprising high polymer material having high chemical resistance, and an outer layer 12 provided on the outer circumference of the inner layer, comprising high polymer material having elasticity. The form of the whole tube is symmetric, and ridge-shaped curvatures 14a and 14b having inflection points 13 are connected through edge parts 15. Hardness of the inner layer 11 is HDD45-85 as measured based on JIS K 7215. Hardness of the outer layer 12 is HDA40-90 as measured based on JIS K 7215. COPYRIGHT: (C)2006,JPO&NCIPI
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