Extrusion & Post
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PET production speed stability
Problem Phenomenon
After frequent extrusion speed adjustments, sheet yellowing and thickness fluctuations appear alternately
Cause Analysis
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
Solution
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
Key Takeaway
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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