Extrusion & Post
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Longitudinal thickness fluctuation of PET film
Problem Phenomenon
The longitudinal thickness of PET biaxially stretched film fluctuates periodically, affecting winding flatness.
Cause Analysis
The extruder or metering pump output pulsates; casting drum speed fluctuates; stretching roller speed ratio is unstable; filter clogging causes pressure fluctuation.
Solution
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.
Key Takeaway
Longitudinal thickness fluctuation of PET film originates from equipment stability.
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