FLUORORESIN LAMINATED PIPE AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide a laminated pipe in which a modified PTFE layer substantially consisting of PTFE is fused and integrated with the inside and/or outside of a resin pipe with fiber reinforced modified PTFE having high mechanical strength and to provide a method for producing the laminated pipe. SOLUTION: A modified PTFE film 6 having high coefficient of thermal expansion is arranged in the inside of a fiber reinforced resin pipe 7 consisting of modified PTFE in which a unit such as perfluoro(alkyl vinyl ether) is copolymerized in a range within 0.01-1mol%. The modified PTFE film 6 is burned. As the film 6, a cylindrical body 1 is used and a segmental film 2 is cut off by cutting work and a film 3 is cut so that cross direction 5 becomes the circumferential direction of a resin pipe. The cylindrical body film 6 is formed by abutting the end faces 4, 4' in the longitudinal direction (winding direction) and arranged in the inside of the fiber reinforced resin pipe 7 and burned to perform integral treatment. The outside covering is formed by arranging a modified PTFE pipe having the high coefficient of thermal expansion in the outside of the fiber reinforced resin pipe and burning it to perform integral treatment.