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Compression and Transfer Molding EquipmentGlossary Terms U-V: Used in the Compression, Lamination and Transfer Molding ProcessA-B • C-D • E-F • G-H • I-J • K-L • M-N • O-P • Q-R • S-T • U-V • W-XUNDERCURE:State of vulcanization less than optimum. It may be evidenced by tackiness or inferior physical properties. VENTING:Removal of trapped air from the mold; accomplished either by the incoming injected rubber expelling the air via vent grooves cut into the mold, by the use of a mechanical vacuum pump to evacuate the closed mold chamber prior to the onset of injection, or by the use of receiver tanks to reach vacuum quickly. VISCOSITY:The resistance of a material to flow under stress. VULCANIZATION:An irreversible process in which the rubber's chemical structure is altered, and as a result, the properties of the rubber are improved. Compression Molding Presses | Vacuum Molding Presses | Transfer Molding Presses Wabash MPI |