Injection Molding
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HDPE '2079851475616104452 sink marks
Problem Phenomenon
Depressions at thick-walled areas and behind ribs.
Cause Analysis
High shrinkage + insufficient holding pressure compensation; the gate freezes too early.
Solution
①Increase holding pressure and time; ②enlarge the gate; ③rib thickness ≤60% of wall thickness; ④reduce material in thick walls.
Key Takeaway
Sink marks are tackled with both holding pressure and structural material reduction.
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