Material Drying
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Internal bubbles in products caused by ABS water content
Fenómeno do problema
Fine bubbles appear inside the product or in thick-wall areas; holes can be seen when cut open, often accompanied by silver streaks.
Análise das causas
When the raw material is wet, water vapor turns into steam in the barrel and mixes into the melt; after filling, it is sealed inside the product to form bubbles; it is most likely to occur when the drying time is insufficient or the ambient humidity is high.
Solução
①Strengthen drying (80~100℃, 2~4 hours, moisture content <0.2%); ②appropriately lower the barrel temperature to reduce volatilization; ③increase back pressure to discharge gas; ④improve mold venting.
Conclusão principal
For bubbles, check water content first, then check temperature and venting; the order cannot be reversed.
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