Dismiss
InnovationQ and the IP.com Prior Art Database will be updated on Sunday, December 15, from 11am-2pm ET. You may experience brief service interruptions during that time.
Browse Prior Art Database

SINK MARK PREVENTION FEATURE FOR INJECTION MOLDED PLASTIC PARTS

IP.com Disclosure Number: IPCOM000008465D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-17

Publishing Venue

Motorola

Related People

Authors:
Michael H. Brannan Jerry R. Nichols

Abstract

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.