Molds & Tooling
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LDPE Ejection Whitening
Problem Phenomenon
Whitening and deformation at the ejector pin positions of LDPE products
Cause Analysis
LDPE is soft, and concentrated ejection force causes local deformation and whitening; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Enlarge and increase ejector pins; sufficient cooling; sufficient demolding draft; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate the effective measure
Key Takeaway
Ejection whitening relies on balanced ejection and sufficient cooling; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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