Injection Molding
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HDPE '2079851475616104452 large dimensional shrinkage
Problem Phenomenon
HDPE part dimensions are overall smaller than expected.
Cause Analysis
HDPE shrinkage rate is high and varies greatly with wall thickness and holding pressure; the design value is too low.
Solution
①Modify the mold according to measured shrinkage; ②optimize holding pressure; ③unify measurement aging (crystallization continues); ④leave mold modification allowance for key dimensions.
Key Takeaway
HDPE dimensional management = measured shrinkage + unified aging.
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