B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 43/58 (2006.01)
Patent
CA 2187566
A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled 50 that the following expression (1) is satisfied: 0.5 ? B/A ? 2 (1) wherein A (mm/s2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region , which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s7) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is completed. By this method, a molded article having excellent surface appearance free from unevenness of gloss and surface irregularity can be obtained.
Kitayama Takeo
Matsumoto Masahito
Nakamura Yukito
Togawa Yoshiaki
Tsutsubuchi Masaaki
Marks & Clerk
Sumitomo Chemical Co. Ltd.
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