Material Drying
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ABAK insufficient drying bubbles and silver streaks
Fenómeno do problema
Silver streaks, bubbles, and material streaks appear on the surface of ABAK products, with reduced impact strength; moisture absorption of the PA component is the main cause.
Análise das causas
The PA component is highly hygroscopic, and when the moisture content exceeds the standard, it vaporizes at processing temperature; although ABS has low water absorption, the alloy as a whole must be managed according to PA standards; insufficient drying is the most common root cause of alloy defects.
Solução
①Dry fully at 80~90℃×4~6 hours; ②verify that the moisture content meets the standard; ③store sealed after drying to prevent moisture regain; ④when silver streaks appear, check drying first before adjusting the process.
Conclusão principal
ABAK drying management must be carried out according to the strict standards of the PA component; 4~6 hours is the alloy drying benchmark; moisture verification cannot be omitted.; After confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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