Abstract
This chapter presents a comparative analysis of conventional injection molding (IM) and injection compression molding (ICM) in regard of cavity pressure reduction and the quality of decorated moldings. The experiments are carried out on a 150 t Mannesmann Demag Ergotech IM machine, which is equipped with an ICM control. A special test mold that is equipped with shear edges and facilities to preform and fix the decoration material is used in the study. Four pressure transducers are mounted into the mold for cavity pressure measurements. These measurements are stored and visualized with a PC based data acquisition system. The results showed that the injection speed is the most important influence on the cavity pressure in IM and in ICM; the clamping force and the injected melt volume have strong effects. For in-mold surface-decoration, the volume shrinkage is usually not as important as it is for conventional IM. The reason is the decoration material that covered optical problems such as sinkmarks. Therefore, only small or no packing pressures are applied in IM process. Another process parameter for the ICM process that has strong influence on the cavity pressure is the compression speed.
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