Molds & Tooling
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LDPE Ejection Whitening and Demolding
Problem Phenomenon
Thin-walled products whiten and deform at the ejector pin positions after ejection, and deep-cavity parts are scratched
Cause Analysis
LDPE has low rigidity and easily deforms during ejection; small ejector pin area concentrates pressure and causes whitening; insufficient demolding draft and poor polishing aggravate scratching; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Arrange ejector pins with large area and balance; ② eject after sufficient cooling; ③ ensure demolding draft and polishing; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The low rigidity of LDPE requires gentle ejection; large-area balance plus sufficient cooling is the basic configuration; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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