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1. (WO2018123780) COMPOSITE TUBE

Pub. No.:    WO/2018/123780    International Application No.:    PCT/JP2017/045834
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Dec 21 00:59:59 CET 2017
IPC: F16L 11/11
B32B 1/08
B32B 3/30
B32B 5/18
B32B 27/40
Inventors: MITSUHASHI, Kohei
三觜 浩平
A composite tube having: a tubular tube body that is formed from a resin material; a covering layer that is tubular, covers an outer circumference of the tube body, can contract in the axial direction while being guided by the outer circumference of the tube body, is formed from a resin material, and is a bellows shape in which annular peak sections and annular valley sections are alternately formed in an axial direction of the tube body, said peak sections protruding toward a radially outward side and said valley sections being recesses on the radially outward side; and a porous urethane layer that is positioned between the tube body and the covering layer, is clamped between the valley sections and the tube body, has a density of 12kg/m3 or greater and 22kg/m3 or less, and has a hysteresis loss of 42% or greater.