BELLOWS STRUCTURE HOSE FOR AIR

摘要

PROBLEM TO BE SOLVED: To provide a hose capable of restricting the level of noise generated when air flows in it a high speed to be low while keeping flexibility of the hose high. SOLUTION: At least in ridge parts on the inside of a hose 2 corresponding to bellows, recessed parts 12 and/or protruded parts 14 are provided to be extended along the air flow direction, and/or powder is fixed to at least the ridge parts on the inner side of the hose 2 corresponding to the bellows.