Abstract: In this paper, the characteristics of the mold separation of injection molding machine with different clamping units are systemically analyzed. The paper points out there are several typical differences between the different clamping units. Meanwhile, it shows there is a linear relation between the mold separation value and the product weight. The injection pressure and injection time affect the mold separation linearly. The greater the injection pressure, the bigger the mold separation. The longer the injection time, the bigger the mold separation.

Key words: clamping unit, direct hydraulic pressure, toggle clamping, mold separation, injection pressure, injection time