Molds & Tooling
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PA6 Demolding Ejector Whitening and Scratch
Problem Phenomenon
After ejection, the ejector pin positions turn white, deep-cavity parts are scratched and deformed, and the yield rate fluctuates
Cause Analysis
PA6 crystallization shrinkage makes the product tightly grip the core, resulting in large demolding force; small ejector pin area or uneven distribution causes local stress to exceed the limit and produce whitening; insufficient draft angle aggravates scratching
Solution
①Draft angle ≥1°, increased for deep cavities; ②Arrange ejector pins with large area and balanced layout; ③Polish the core to reduce friction, with nitriding treatment if necessary; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The large mold-gripping force of PA6 originates from crystallization shrinkage; the three elements of draft angle, ejection layout and surface condition determine demolding quality; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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