SINK MARK PREVENTION FEATURE FOR INJECTION MOLDED PLASTIC PARTS
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-17
Sink marks are depressions on the surface of injection molded plastic parts caused during the plastic cooling process. Thicker sections of plastic will cool at a slower rate than others, and will yield a higher percentage of shrink in that local area. The extra shrinkage in that local area is what causes the depressions.