Extrusion & Post
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HDPE film uneven thickness
Problem Phenomenon
The transverse thickness deviation of the film is large, loose and tight edges appear after winding, and the film runs off track during bag making.
Cause Analysis
Uneven die gap causes fluctuations in the discharged thickness; uneven air ring cooling makes the blowing degree inconsistent in the transverse direction; film bubble swing also introduces thickness deviation.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Precisely adjust the die gap bolts; ②check the uniformity of air ring air output; ③stabilize the film bubble; ④equip automatic thickness measurement feedback adjustment.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Thickness uniformity is the core indicator of film; the uniformity coordination of the die gap and air ring plus the online thickness measurement closed loop is the guarantee of stability.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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