DME University

Heat Sinks In Plastic Injection Molding

Heat Sink

Sink marks are small depressions on the molded surface as shown here. They can be caused by poor part design, such as having a thick section adjacent to a thin one, causing different cooling and shrink rates. Solutions are to avoid thick / thin adjacent sections if possible. In addition, try decreasing the mold and melt temperature, increasing injection holding time, and rapid filling of the mold.



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