Comparison and Analysis on Cavity Pressure of Conventional Injection Molding and Injection Compression Molding

Abstract

The cavity pressure sensors were mounted in the self-developed injection compression mold. Comparison and analysis on cavity pressure of conventional injection molding and injection compression molding were conducted by changing process parameters. The results show that injection compression molding can greatly decrease the injection pressure and cavity pressure, and make the cavity pressure field more uniform. During the conventional injection molding,the influence of mold temperature on the cavity pressure is the most significant factor, followed by melt temperature, pressure holding time and holding pressure. During the injection compression molding, the compression speed influences the most, followed by melt temperature, mold temperature and compression stroke. The technological advantages and pressure field characteristic of injection compression molding were further validated with the low residual stress and small warpage, indicating the cavity pressure plays a major role in guiding processing properties.

Keywords

• injection compression molding
• conventional injection molding
• cavity pressure
• processing parameters