Molds & Tooling
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PMMA Ejector Whitening
Problem Phenomenon
Whitening at the ejector pins.
Cause Analysis
PMMA is brittle, and concentrated ejection force causes stress whitening; insufficient cooling and small draft angle aggravate it.
Solution
①Extend cooling; ②Large-area ejection; ③Draft angle ≥1° (larger for textured surfaces); ④Reduce holding pressure.
Key Takeaway
Ejector whitening = the force alarm of a brittle material.
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