Effect of processing conditions on warpage of film insert molded parts |
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| Authors: | Soo Jin Baek Seong Yun Kim Seung Hwan Lee Jae Ryoun Youn Sung Hee Lee |
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| Institution: | (1) Precision Molds and Dies Team, Korea Institute of Industrial Technology, Incheon, 406-840, Korea;(2) Research Institute of Advanced Materials (RIAM), Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea |
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| Abstract: | In order to investigate effects of injection molding conditions on viscoelastic behavior and thermal deformation of film insert
molded (FIM) parts, injection molding was performed with various conditions such as injection speed, melt temperature, and
packing time. It was shown that variation of the warpage was decreased monotonically with increasing injection speed and exhibited
a bell-shaped curve as a function of melt temperature. Warpage variation was not affected by the packing time significantly
and the proportional relationship between warpage of the film insert molded part and shrinkage of the injection molded part
without film was observed. The FIM specimens produced with unannealed films showed the warpage reversal phenomenon (WRP) during
annealing and the magnitude of reversed warpage was affected significantly by the injection parameters and the extent of thermal
shrinkage of the unannealed film. Warpage of the FIM specimen was predicted by three dimensional numerical flow and stress
analyses and the predicted values showed a good agreement with the experimental results. |
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| Keywords: | Annealing Injection molding Shrinkage Viscoelastic behavior Warpage |
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