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