Extrusion & Post
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LDPE Cast Film Uneven Thickness
Problem Phenomenon
The cast film transverse thickness deviation is large.
Cause Analysis
Uneven die lip gap or uneven mold temperature distribution; air knife and chill roll conditions also affect the uniformity of attachment and setting.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Precisely adjust the die lip gap; ②Balance the mold temperature distribution; ③Optimize the air knife and chill roll; ④Online thickness measurement feedback.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Cast film thickness relies on die lip precision and attachment uniformity; closed-loop thickness measurement is standard for high-precision production.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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