Extrusion & Post
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PET production speed stability
Fenómeno do problema
After frequent extrusion speed adjustments, sheet yellowing and thickness fluctuations appear alternately
Análise das causas
Speed changes alter melt residence time and shear heat; rebalancing the temperature field takes a process; frequent speed adjustment makes sheet quality fluctuate in the transition state; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
① Maintain stable production speed; ② give sufficient temperature field balancing time after speed adjustment; ③ downgrade and isolate transition section products; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PET extrusion fears fiddling; speed stability is a prerequisite for quality stability, and speed adjustment transition sections must be isolated and managed; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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