Molds & Tooling
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ASA ejection whitening and ejection cracking
Problem Phenomenon
Ejection whitening marks appear at the ejection position of ASA products, ejection cracking occurs at deep cavity reinforcing ribs, and it still occurs intermittently after ejection system adjustment.
Cause Analysis
Local product temperature is too high and stiffness insufficient during ejection; ejector pin pressure concentration exceeds the material bearing limit; insufficient demolding draft and poor cavity polishing increase the clamping force; excessive holding pressure aggravates mold sticking.
Solution
①Reduce holding pressure and fully cool before ejection; ②increase ejector pin number and area to disperse pressure; ③check demolding draft and cavity polishing; ④rounded corner transition at rib roots reduces stress concentration.
Key Takeaway
ASA ejection whitening and cracking is a balance problem of pressure, temperature and friction; excessive holding pressure is an often overlooked cause; ejection system design should be synchronized with product review.
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