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In order to clarify the slow•down factors of injection velocity during thin wall molding (thickness below 0.25 mm) processes in an injection molding machine, we have studied experimentally the dependence of the injection velocity on the following three factors : (1) slip of an electric induction motor for an oil hydraulic pump, (2) characterisitics of the oil hydraulic pump and (3) compression of an oil hydraulic fluid, which are related to the change of pressure load in a mold. The influence of each factor on the injection velocity was evaluated quantitatively by using a modified injection molding machine and a test flow mold. From experimental results, it was found that the slow¥down of injection velocity mainly depended on the compression of oil hydraulic fluid.

Studies on the Slowdown Factors of Injection Velocity during Thin Wall Molding Processes.