Injection Molding
3 views
Ejector whitening on EAA injection molded products
Problem Phenomenon
White marks appear at the ejector pin positions of EAA injection molded products, ejector whitening affects appearance
Cause Analysis
Excessive ejector pin force causes local compression deformation and whitening; insufficient cooling time, the product is ejected before being fully solidified; ejector pin area too small, stress concentration
Solution
1) Extend the cooling time so that the product is fully solidified before ejection; 2) Increase the ejector pin area, use an ejector plate instead of small ejector pins; 3) Reduce the ejection speed to reduce the impact force; 4) Increase the demolding draft to reduce the ejection force
Key Takeaway
Ejector whitening is caused by excessive ejection force and insufficient cooling; increasing the ejector pin area and extending the cooling time are the key
Was this helpful?
0 people found this helpful
Thank you for your feedback!