| 摘要 |
PROBLEM TO BE SOLVED: To easily continuously mold a polyolefin liner pipe to be inserted without resistance even in a bent pipeline. SOLUTION: The method for manufacturing a polyolefin liner pipe comprises the steps of extrusion molding a melted polyolefin resin in a tubular state, then once cooling the molded product 3 in a cooling tank 4, then reheating the molding 3 in a heating tank 5 at a softening point to a melting point, deforming it flatly at a tube section of the heated molded product 3, and cooling the flatly deformed molding 3 in a cooling tank 7. |
