Extrusion & Post
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PET sheet roll temperature control
Problem Phenomenon
The PET sheet surface is foggy with poor transparency, and adjusting the mold temperature is ineffective
Cause Analysis
When the calendering roll temperature is too low, the melt is quenched against the roll, and the surface crystallizes and fogs; uneven roll temperature also causes transverse transparency differences; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Set the three-roll temperature in a gradient of 70-80℃ for the upper roll, 60-70℃ for the middle roll, and 50-60℃ for the lower roll; regularly test the roll surface temperature uniformity; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Sheet transparency is mainly determined by the roll temperature gradient and uniformity; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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