Extrusion & Post
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LDPE Film Transverse Thickness Non-uniformity
Problem Phenomenon
The transverse thickness deviation of the film exceeds the standard; after winding, one side is loose and the other tight, and bag making runs off track.
Cause Analysis
Uneven die gap causes transverse fluctuation of the output; inconsistent air supply around the air ring causes different cooling and blow-up degrees; uneven die temperature distribution also has an effect.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Adjust the die gap of the die head to be consistent everywhere; ②Adjust the cooling air ring for uniform air output; ③Adjust the die temperature distribution; ④Equip automatic thickness measurement with transverse feedback.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Transverse thickness is guaranteed by the uniformity of the die gap and air ring; closed-loop automatic thickness measurement is standard equipment for wide film.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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