| 摘要 |
<p>PURPOSE:To obtain a pipe excellent in high temperature resistance and elasticity by winding a spacer braid by a designated pitch on the outer periphery of an inner plastic pipe, and using a corrugated pipe as an outer plastic pipe positioned outside the inner pipe. CONSTITUTION:A plastic spacer braid 2 is wound by a designated pitch between inner and outer plastic pipes 1, 3 and a corrugated plastic pipe 3 is further provided thereon. The multiple plastic pipe is manufactured by winding a plastic spacer braid 2 by a designated pitch round the outer periphery of the inner plastic pipe 1, surface-lubricating the above to be supplied as a core 10 to a plastic extrider 11, and extruding the outer plastic pipe 3 on the core. Accordingly, as slippage is generated between the inner and outer plastic pipes, the rigidity for bending is small, and furthermore, as the outer pipe is a corrugated pipe, the flexibility is excellent.</p> |
