Abstract
This article studied the demolding of an array of injection molded micro‐structures based on a design of experiments (DOE) method. The demolding force (Fd) to eject an array of 4 × 5 micro‐ridges from the cavity of a mold was calculated indirectly. It was found that mold temperature had a significant effect on the demolding force: the demolding force decreased as mold temperature increased and as the part substrate thickness also increased. The demolding force is a combination of the adhesion force and friction force that exist between a molded feature and the microcavities of a mold. When the processing parameters were optimized to minimize the demolding force during the ejection process, it was found that the adhesion force had a bigger influence than the friction force. POLYM. ENG. SCI., 56:810–816, 2016. © 2016 Society of Plastics Engineers
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