Processing Machinery
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HDPE film snaking swing
Problem Phenomenon
The film bubble swings left and right periodically, and the end face of the wound roll is uneven.
Cause Analysis
Melt pressure resonance (coupling of screw speed and melt elasticity) or turbulent airflow of the air ring causes it; frost line fluctuation often accompanies it.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Install a melt gear pump to stabilize the pressure; ②adopt a low-turbulence air ring structure; ③adjust the screw speed to avoid the resonance zone; ④stabilize the cooling air volume.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Snaking swing is a system stability problem; pressure stabilization and air stabilization are the two major engineering means.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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