B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/680
B29C 45/00 (2006.01)
Patent
CA 1291608
ABSTRACT OF THE DISCLOSURE A predetermined amount of melted thermoplastic resin of raw material is injected into a molding space which is previously set to a temperature higher than that at which the resin begins to harden under the normal pressure and which has a capacity larger than a volume of a product. The injected resin is cooled in the molding space and pressurized before the resin is cooled to the temperature at which the resin begins to harden under the normal pressure. When pressurized, the glass transition temperature of the thermoplastic resin is shifted to a higher temperature side so that the thermoplastic resin hardens in slight reduction of the temperature. The resin is cooled in the pressurized state until the resin possesses the dynamic rigidity under the normal temperature and pressure. While the thermoplastic resin is further cooled to the extraction temperature, the pressure applied to the resin is controlled so that increase of the dynamic rigidity due to the cooling is canceled and the dynamic rigidity of the thermoplastic resin in the cooling is maintained to that under the normal temperature and pressure.
568333
Nakagawa Tatsuji
Oyamada Yasuhiko
Uehara Tadayoshi
Aida Engineering Ltd.
Marks & Clerk
Nakagawa Tatsuji
Oyamada Yasuhiko
Uehara Tadayoshi
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