| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method capable of solving a shrinkage problem due to temperature of a longitudinal molded article. SOLUTION: In the manufacturing method of a longitudinal molded article having a prescribed length comprising processes of extruding resin, cooling the molded resin and cutting the cooled resin into a prescribed size, the longitudinal molded article is manufactured by applying a predetermined temperature to the longitudinal molded article after the cooling, that is, performing the annealing of the longitudinal molded article, wherein the resin is extruded tubularly, is molded as a tube, the annealing is performed after cutting the longitudinal molded article, the annealing is performed by heating the longitudinal molded article at about 60°C or more for about one hour or more and the annealing is performed by projecting the longitudinal molded article in a furnace and, thereby, heating the same. COPYRIGHT: (C)2010,JPO&INPIT |
