Molding Process
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Internal bubbles and shrinkage cavities of PMMA thick-walled parts
Fenómeno do problema
Shrinkage cavities or vacuum bubbles appear in the center of thick-walled PMMA products.
Análise das causas
The outside cools and solidifies first, hindering center feeding; insufficient holding pressure forms shrinkage cavities.
Solução
Extend holding pressure time; optimize gate size to delay freezing; staged holding pressure.
Conclusão principal
PMMA thick-walled shrinkage cavities are the result of insufficient holding pressure.
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