Material Drying
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HDPE injection molded product strength decline
Problem Phenomenon
HDPE parts fail mechanical testing, with no appearance abnormality.
Cause Analysis
Too much regrind, thermal degradation, weld lines passing through stressed areas; or moisture-containing regrind causing internal micropores.
Solution
①Control the regrind ratio; ②stabilize heat history; ③keep weld lines away from stressed areas; ④dry the regrind.
Key Takeaway
Strength decline with normal appearance = a material history problem.
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