Скачать или смотреть This PLASTIC INJECTION MOLDING defect causes DEPRESSION on your part | SINK MARKS

In this video, our CEO Gordon Styles explains Sink Marks.
Sink marks are caused mainly by thermal contraction (shrinkage) during cooling. After the material on the outside has cooled and solidified, the core material starts to cool. Its shrinkage pulls the surface of the main wall inward, causing a sink mark.

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