Injection Molding
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PA6 '2079851475616104452 Ejection Whitening
Problem Phenomenon
Whitening at ejector pins, obvious on dark parts.
Cause Analysis
Large gripping force, concentrated stress, insufficient cooling; PA6 crystallization shrinkage causes large gripping force on the core; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Extend cooling time so that the product is fully set before demolding;②large ejection area;③appropriately reduce holding pressure to reduce gripping force and frozen internal stress;④polish the core;⑤optimize the ejector pin layout.
Key Takeaway
PA6 ejection whitening = 'concentrated stress': disperse ejection force and give sufficient cooling; crystalline nylon has large gripping force, and the ejection system must leave sufficient margin; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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