| 摘要 |
PROBLEM TO BE SOLVED: To provide the subject method capable of preventing the expansion inferiority of a synthetic resin pipe caused by the excessive expansion thereof. SOLUTION: A synthetic resin lining pipe is produced by a method wherein a metal pipe 4 into which a heat-expansible synthetic resin pipe 2 is inserted is successively heated from the central part thereof to the pipe end part thereof by an almost V-shaped heating apparatus 3 while fed in the direction right- angled to the axial direction of the metal pipe 1 and the synthetic resin pipe 2 is expanded in its diameter to be closely bonded to the inner surface of the metal pipe 1 and sucked by the hot air suction device 4 arranged between the rear mutually opposed inside edges of the heating apparatus 3. |
