During the clamping portion of the injection molding cycle, the clamp should close quickly at first and then slowly until closed (without slamming). Once closed, the press builds high clamp pressure or tonnage before injecting plastic. The function of the clamping portion of the injection molding cycle is to quickly and safely close the mold. Once closed it must build tonnage to resist the injection unit pushing material into the mold.
Page 6 of 10