Press Leaders

Compression and Transfer Molding Equipment

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Glossary Terms U-V
Used in the Compression, Lamination and Transfer Molding Process


State of vulcanization less than optimum. It may be evidenced by tackiness or inferior physical properties.


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.


The resistance of a material to flow under stress.


An irreversible process in which the rubber's chemical structure is altered, and as a result, the properties of the rubber are improved.