Processing Machinery
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PCABS regrind ratio control
Fenómeno do problema
【Problem Phenomenon】PC/ABS silver streaks and strength decline after adding regrind, ratio out of control
Análise das causas
Regrind with multiple heat histories has decreased molecular weight and carries volatiles, very prone to silver streaks; recommended regrind ≤15%, yellowed and black-specked multiply-recycled material is directly discontinued; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solução
Regrind ratio ≤15% and dried separately; limited use for appearance and performance parts; degraded regrind is resolutely not used; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PC/ABS regrind capped at 15%, degraded material is rejected with one vote; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems later
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