Processing Machinery
2 Aufrufe
PVC Residence Time Management
Problembeschreibung
Small products produced on large machines, first few shots normal, then products gradually discolor and degrade
Ursachenanalyse
PVC slowly degrades even within processing window: at 170-180℃ can stay 30-45 minutes, at 185-195℃ only 15-20 minutes, above 200℃ 5-10 minutes is high risk; low shot weight ratio inevitably exceeds time
Lösung
①Shot weight accounts for 40-75% of barrel capacity; ②Small parts change to small machine; ③Shutdown overtime replace barrel with PE/PP; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Residence time is PVC's second red line besides temperature; 40-75% shot ratio plus replacement procedure, neither can be omitted; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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