Processing Machinery
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PVC Processing Window 160-195℃
Fenómeno do problema
PVC products yellow and discolor, degradation signs appear when barrel temperature is slightly high, process adjustment space extremely small
Análise das causas
PVC is the general-purpose plastic with the worst thermal stability, processing window only 160-195℃, absolute upper limit 200℃; exceeding it starts the de-HCl degradation chain reaction, temperature tolerance only ±5-10℃
Solução
①Melt temperature rigid 175-195℃, soft 160-180℃; ②Absolutely not exceeding 200℃; ③Temperature control precision ±3℃ and regularly calibrate thermocouples
Conclusão principal
PVC temperature discipline is the strictest among general-purpose plastics; 200℃ is an untouchable red line, the narrow window determines dual high requirements for equipment and management; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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