a thermoforming machine with accurate process and heater control for the forming process was used in this study. the forming system and test film are shown in fig2. for simensional measurement, a precision imaging measuring system equiooed with 2um encodes and the Q-16 metrology was used to measure the formed film. the thickness gauge. in order to understand the effect of forming conditions during thermoforming processing, a variety of forming parameters including mold temperature,film pre-heating temperature, plug depth and plug holding time were used in this study.