Processing Machinery
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HDPE film frost line oscillation
Problem Phenomenon
The frost line height fluctuates periodically up and down, accompanied by changes in film thickness and width.
Cause Analysis
Uneven extrudate temperature distribution or accumulation of degraded material in the die head causes discharge fluctuation; cooling air volume fluctuation also causes the frost line position to drift.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Stabilize the extrusion temperature distribution; ②regularly clean the accumulated material in the die head; ③stabilize the cooling air volume; ④monitor the frost line height trend.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The frost line is a barometer of the stability of the film blowing process; after the temperature, die head and air volume are stabilized in three places, the frost line will naturally be stable.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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