| 摘要 |
Disclosed is a method for manufacturing a pipe having double layers, which enables the adhesion between a metal pipe layer and a synthetic resin pipe layer of the pipe to be stably maintained even when external environment changes. In the method, a synthetic resin pipe having a double layer-structure is formed, and the synthetic resin pipe is inserted into a metal pipe. Then, the metal pipe is heated to make an adhesive resin of the synthetic resin pipe be heated up to a softening temperature of the synthetic resin pipe, and air between an inner surface of the metal pipe and an outer surface of the synthetic resin pipe is exhausted, so as to make a space between the inner surface of the metal pipe and the outer surface of the synthetic resin pipe be vacuum. In result, the metal pipe and the synthetic resin pipe are bonded together.
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