| 摘要 |
<p>PURPOSE:To obtain a resin-lined metal pipe excellent in corrosion resistance, chemical resistance, heat resistance, strength, rigidity and the like by a method wherein a heat-expansible polyphenylene sulfide resin pipe is inserted onto the inner surface of a metal pipe so as to bond onto the inner surface of the metal pipe by expanding thermally in order to form a resin lining. CONSTITUTION:A heat-expansible polyphenylene sulfide (PPS) resin pipe is inserted onto the inner surface of a metal pipe, and resin lining is formed by bonding a PPS resin pipe onto the inner surface of the metal pipe through the thermal expansion of the PPS resin pipe. The heat-expansible PPS resin pipe concerned is a PPS resin pipe, which has normally an outer diameter equal to or larger than the inner diameter of the metal pipe and is diametrically reduced at the temperature, which is higher than or equal to the softening point of the resin and lower than or equal to the pour point of the resin, by being passed through, for example, a die so as to make the outer diameter of the resin pipe smaller than the inner diameter of the metal pipe and restores the original form by reheating and the order of the shrinkage after the cooling of which is low. The resultant resin-lined metal pipe has excellent corrosion resistance, acid resistance, alkali resistance, solvent resistance and heat resistance to various fluids and excellent characteristics in combination of said characters with the excellent strength, rigidity and creep characteristics of the metal pipe on the outer tube side.</p> |
