| 摘要 |
PURPOSE:To obtain a molded form such as a hollow molded vessel, etc., having excellent transparency and dimensional stability by heating saturable crystalline polyester resin at a melting point or higher, supplying it in a molten state to a molding machine to mold it, and specifying the crystallizing temperature of the molded form. CONSTITUTION:A pellet of crystallized polyethylene terephthalate is introduced into a dehumidifying type drier to be dried, filled, for example, in a metal can in nitrogen, and cooled to an ambient temperature. This chip is heated by an electric heater drier to substantially molten state, press-fitted in a screw in-line type injection molding machine, injection molded in a parison mold to obtain an amorphous parison. The crystallizing temperature Tc2 of polyethylene terephthalate after molding and the crystallizing temperature Tc1 of the crystalline polyethylene terephthalate of a material satisfy Tc1-20<=Tc2<=Tc1. |
