| 摘要 |
PROBLEM TO BE SOLVED: To provide a flexible tube connected with equipment such as a beer server through a detachable joint to supply gas and liquid, having excellent resistance to bending fatigue and shock and capable of remaining transparent without leaving a whitened folding trace even when it is necessary to bend the tube because the equipment is installed in a narrow place and allowing easy visual confirmation of a passing condition of the liquid. SOLUTION: As a material for forming the tube, thermoplastic elastomer made of tri-block copolymer in which polystyrene and vinyl-polyisoprene are bonded is blended with polypropylene for use. By changing a blend ratio, it is possible to provide the soft and semi-soft tube having desired hardness.
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