Extrusion & Post
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Longitudinal thickness fluctuation of PET film
Fenómeno del problema
The longitudinal thickness of PET biaxially stretched film fluctuates periodically, affecting winding flatness.
Análisis de la causa
The extruder or metering pump output pulsates; casting drum speed fluctuates; stretching roller speed ratio is unstable; filter clogging causes pressure fluctuation.
Solución
Check the condition of the extruder and metering pump; stabilize the casting drum and stretching roller drives; replace clogged screens; use online thickness measurement feedback control.
Conclusión clave
Longitudinal thickness fluctuation of PET film originates from equipment stability.
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