| 摘要 |
PURPOSE:To obtain a method for extrusion molding a thermoplastic resin pipe with no possibility of leaving moisture in the outer foamed resin layer. CONSTITUTION:A two layer thermoplastic resin pipe 1c, comprising an inner unfoamed thermoplastic resin layer 1b and an outer foamed thermoplastic resin layer 1a, is extrusion molded using a two layer extrusion molding die 3. The resin pipe 1c is then passed through a water tank 4 and cooled and the moisture contained in the outer foamed thermoplastic resin layer 1a is evaporated by means of hot air. |
