Injection Molding
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Difficult demolding in PVA '2079851475616104452
Problem Phenomenon
PVA injection molded products have large demolding force, products deformed or scratched, demolding time accounts for 30% of the cycle
Cause Analysis
Large adhesion between PVA and mold cavity; draft angle insufficient <0.5°; cooling time insufficient, product demolded before fully solidified; ejection mechanism design unreasonable
Solution
1) Increase mold draft angle to 1-2°; 2) Extend cooling time so that the product is fully solidified before demolding; 3) Polish mold surface to Ra<0.2μm; 4) Increase ejection area, use large-area ejector plate; 5) Spray mold release agent (temporary solution)
Key Takeaway
Difficult demolding is caused by adhesion and insufficient mold design; increasing draft angle is the fundamental measure
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