Injection Molding
1 visualizações
PVA '2079851475616104452 sink marks
Fenómeno do problema
PVA injection molded product thick-wall areas show surface depressions of 0.2-0.5mm sink marks
Análise das causas
Holding pressure insufficient or holding time short; gate freezes too early so holding pressure cannot be transmitted; large wall thickness difference, after the thin wall freezes the thick wall cannot be fed
Solução
1) Increase holding pressure 70-90MPa; 2) Extend holding to gate freezing +2s; 3) Product design to reduce wall thickness differences with gradual transition; 4) Add supplementary gates in thick-wall areas
Conclusão principal
Sink marks are caused by insufficient holding and wall thickness differences; high-pressure holding and multiple gates are the core countermeasures
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!