Thermoforming
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Uneven thickness of PET extruded sheet
Problem Phenomenon
The transverse thickness of PET extruded sheet fluctuates greatly, thin in the middle and thick on both sides or vice versa, affecting subsequent '2079851475616104458.
Cause Analysis
Die lip gap adjustment is improper; melt temperature distribution is uneven, causing viscosity differences; the three-roll calender gaps are not parallel.
Solution
Precisely adjust die lip bolts, using automatic die lip control; optimize the temperature of each section; calibrate the three-roll gaps and check roll temperature uniformity.
Key Takeaway
PET sheet thickness uniformity requires coordinated control of multiple links.
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