Warpage is a serious problem for box-shaped injection molded products. In this study, we experimentally manufactured a mold in which sheath thermo-couples are installed at each part, to measure in-mold temperature distribution for various patterns of cooling channels and core inserts made of several materials. Using the mold, we investigated the correlation between temperature distribution and warpage, and then obtained the following results;
(1) A clear correlation between warpage and temperature difference from the movable mold and stationary one was verified.
(2) The increase in temperature difference brought about higher warpage. Furthermore, the decrease in temperature difference caused the warpage reduction by 20-30% when the arrangement patterns of cooling channels were changed.
