Study on the Effects of an Insulation Film on the Cooling Process and Filling Properties of Mold Cavities During Partial Compression Molding

We investigated the effects of an insulation layer on the replication quality of micro lenses using partial-filling compression molding processes. A polyimide film with high thermal stability was applied to a mold insert to delay cooling, and a strain gauge was used to measure the surface temperature of the mold insert. Under this method, the thermal history during molding and cooling was analyzed with and without the insulation layer. Finally, we analyzed and experimentally compared the surface profiles of the molded lenses with and without the insulation layer. Results showed that compared to the case without an insulation layer, the height of the partial-filling molded lens increased by 1.4 μm after the insulation layer was applied.