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209. Some forms of Compression Molding 

The charge of molding compound material can initially be in any of several forms, including powder or pellets, liquid, or pre-form. To achieve consistency from part to part in the production molding, precise control of the amount of polymer is necessary. Typically the charge is heated before placement into the custom mold: The polymer is thereby softened, facilitating a shortening of the molding production cycle. This pre-heating can be accomplished using infrared heaters or convection heating in an oven. Alternatively, the use of a heated rotating screw in a barrel (an aspect of injection molding) can both pre-heat the polymer and meter the amount of the plastic charge to go into the mold.

Mold presses (pressing tools) contain two platens to which the mold halves are fastened, and are oriented vertically. The mold presses utilize either of two types of actuation: (1). An up-stroke of the bottom platen, or (2). A down-stroke of the top platen. The upstroke method is more common. Generally the mold presses are powered by a hydraulic cylinder with clamping capacities of as much as several hundred tons.