| 摘要 |
A method for the production of composite pipes that have an inner pipe made of synthetic resin and an outer pipe made of metal, the inner surface of which is lined with the inner pipe. Said method comprising applying a foaming adhesive to the inner surface of an outer pipe, introducing an inner pipe made of synthetic resin into the outer pipe, and heating the foaming adhesive to foam and harden the foaming adhesive, wherein said inner pipe has, on its outer surface, a number of lines projecting from the inner pipe that are parallel with the axis of the pipe, said lines being of fixed length and discontinuous so that said inner pipe can be concentric with the outer pipe when it is introduced into the outer pipe. |
