Injection Molding
9 views
Ejector Whitening of PBT Injection-Molded Products
Problem Phenomenon
White patches or stress cracks appear at the ejector pin positions when PBT products are demolded.
Cause Analysis
The ejection force is too large or the ejector pin area is too small, and the local stress exceeds the limit; the draft angle is insufficient, increasing the demolding force; the cooling is insufficient and the strength is not enough.
Solution
Increase the ejector pin area or increase the number; increase the draft angle ≥2°; extend the cooling time.
Key Takeaway
PBT ejector whitening is the result of excessive local stress.
Was this helpful?
0 people found this helpful
Thank you for your feedback!