Thermoforming
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Uneven thickness of PET extruded sheet
Fenómeno del problema
The transverse thickness of PET extruded sheet fluctuates greatly, thin in the middle and thick on both sides or vice versa, affecting subsequent '2079851475616104458.
Análisis de la causa
Die lip gap adjustment is improper; melt temperature distribution is uneven, causing viscosity differences; the three-roll calender gaps are not parallel.
Solución
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.
Conclusión clave
PET sheet thickness uniformity requires coordinated control of multiple links.
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