Injection Molding
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Difficult Demolding in PU '2079851475616104452
Fenómeno del problema
PU injection molded products have large demolding force, products deformed or scratched, demolding time accounts for 30% of the cycle
Análisis de la causa
Adhesion between PU and mold cavity large; draft angle insufficient <0.5°; cooling time insufficient, product demolded before fully cured; ejection mechanism design unreasonable
Solución
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)
Conclusión clave
Demolding difficulty is caused by adhesion and insufficient mold design; increasing draft angle is the fundamental measure
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