Injection Molding
3 views
Difficult Demolding in PU '2079851475616104452
Problem Phenomenon
PU injection molded products have large demolding force, products deformed or scratched, demolding time accounts for 30% of the cycle
Cause Analysis
Adhesion between PU and mold cavity large; draft angle insufficient <0.5°; cooling time insufficient, product demolded before fully cured; ejection mechanism design unreasonable
Solution
1) Increase mold draft angle to 1-2°; 2) Extend cooling time to fully cure the product before demolding; 3) Polish mold surface to Ra<0.2μm; 4) Increase ejection area using large-area ejector plate; 5) Spray release agent (temporary solution)
Key Takeaway
Demolding difficulty is caused by adhesion and insufficient mold design; increasing draft angle is the fundamental measure
Was this helpful?
0 people found this helpful
Thank you for your feedback!