Sacrificial Layer to Relieve Pinch Flashing in Molding Operations
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United States of America Patent
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Issued Date -
Mar 22, 2012
app pub date -
Sep 17, 2010
filing date -
Sep 17, 2010
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Abstract
A method to reduce or eliminate pinch flashing in mold operations by applying a thin coating of a hydrocarbon wax to the outside surface of an uncured rubber article or on the sidewall or shoulder of a green tire at a location(s) where segments of the mold close on each other and on the rubber article or tire during cure. The hydrocarbon wax has a melting point from about 60 degrees to about 80 degrees Celsius, and is compatible with the composition of the rubber. The hydrocarbon wax acts as a sacrificial layer and is scraped up by the mold parts instead of the rubber when the mold segments close.
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