4 Mold Selection
gate must be opened to access the mold for servicing. The rear gate is usually either screwed locked, or does not have safety features such as drop bars. Opening the rear gate often stops the operation of the machine completely, even shutting down the hydraulic pumps. Over the years, with these safety features in molding operations, the number of personal injury-accidents has greatly decreased. Referring back the Fig. 4.54, plates (a) and (c) must be locked together solidly even though they are clamped together during injection by the clamping force of the machine. If plastic is injected...