Extrusion & Post
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Shell-core delamination of products
Fenómeno del problema
The product sounds dull when knocked, and separation of the skin layer and core layer is clearly visible on the cross-section
Análisis de la causa
Mold temperature is too low; the skin layer cools rapidly while the core layer is still flowing; the shrinkage rate difference between the two components is >0.5%; holding pressure switchover position is too early
Solución
Increase mold temperature to an appropriate range (determined by the matrix material); select blended components with similar shrinkage rates; delay holding pressure switchover to over 95% filling
Conclusión clave
Shell-core delamination is the result of the combined action of cooling shrinkage differences and holding pressure conditions
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