| 摘要 |
PROBLEM TO BE SOLVED: To prevent the dimensional change of a tube in the diameter direction thereof in a method for winding the tube after extrusion molding around a winding member to heat-treat the same. SOLUTION: A tube comprising a thermoplastic elastomer with a glass transition temp. of 20-60 deg.C is produced by extrusion molding to be cooled in water. In this case, the tube 2 after extrusion molding is cooled while passed through a water tank 3 of which the temp. is controlled so as to satisfy formula: X-20<=Y<=X+20 (wherein X is the glass transition temp. of the material constituting the tube and Y is the temp. of water in the water tank). |
