Abstract
The flow behavior of core material in the fork portion of a plastic sandwich molding was studied by using a dynamic visualization technique. High viscosity resin GPPS685 and low viscosity resin GPPS679 were used in the experiments. It was found that in the fork portion, although the molding conditions have almost no effect on the flow pattern of the skin material, they influenced the flow pattern of the core material: (1) Mold temperature slightly influences the flow patterns of the core material. (2) The flow properties of resins also affect the flow patterns of core material. An imbalanced design causes more problems than in ordinary injection molding. Low viscosity material yielded a well balanced filling more easily than high viscosity material. (3) The injection rate strongly affects the flow behavior of the core material in a complicated manner.
Published Version
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