Injection Molding
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HDPE injection molded product sink marks - thick-walled type
Problem Phenomenon
Thick-walled HDPE parts have severe surface depressions.
Cause Analysis
Excessive wall thickness means large shrinkage, which conventional holding pressure cannot compensate; PP/PE thick-walled parts should be structurally material-reduced.
Solution
①Core out thick walls to reduce material; ②gate near the thick wall; ③increase holding pressure; ④strengthen cooling.
Key Takeaway
For thick-wall sink marks, structural material reduction is prioritized.
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