Glossary Terms O-P
Used in the Compression, Lamination and Transfer Molding Process

PARALLELISM:

The degree to which the moving and stationary platens/bolsters are designed to remain parallel during machine operation.

PART EJECTOR:

In plastics, typically, a hydraulically actuated cylinder or pin that pushes the part out of the mold cavity. May also be used to refer to any mechanism used to eject a part.

PLATEN COOLING SYSTEM:

A system to, circulate compressed air and/or water to automatically cool the platens on the press.

POLYMER:

Chain-like molecule made up of many monomers linked together.

POST CURE:

A cure cycle after the initial molding to reach the correct shape and physical properties to allow transfer of the molded parts to this secondary operation, thus freeing-up the injection.

PROJECTED AREA:

The area created by the part(s) to be molded and the resulting flash on which the mold cavity pressure caused by injection acts to oppose the press clamping force; the greater the area, the greater the force opposing the clamp.

PRESSING SPEED CONTROL:

The ability to adjust the "slow close" speed at which the machine operates. On a standard WABASH machine, the "slow close" speed is fixed and only the position is adjustable. With this option, both position and speed are adjustable.

PROPORTIONAL CONTROL:

A type of hydraulic control where the magnitude of the control output is proportional to the difference between the process set point and the actual reading. The greater the error signal, the greater the control response.