Injection Molding
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EVOH '2079851475616104452 demolding difficulty
Fenómeno do problema
EVOH injection molded products have large demolding force, product deformation or strain marks, demolding time accounts for 30% of the cycle
Análise das causas
Large adhesion between EVOH and mold cavity; insufficient draft angle <0.5°; insufficient cooling time, product demolded before fully solidified; unreasonable ejection mechanism design
Solução
1) Increase mold draft angle to 1-2°; 2) Extend cooling time so the product is demolded after full solidification; 3) Polish mold surface to Ra<0.2μm; 4) Increase ejection area using large-area ejector plate; 5) Spray release agent (temporary solution)
Conclusão principal
Demolding difficulty is caused by adhesion and insufficient mold design; increasing draft angle is the fundamental measure
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