Extrusion & Post
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HDPE film longitudinal thickness fluctuation
Problem Phenomenon
The film thickness changes periodically along the longitudinal direction, corresponding to the operating rhythm of the equipment.
Cause Analysis
Fluctuation of the main motor speed (such as a loose belt) causes the extrusion output to pulsate; uneven rotation of the haul-off rollers and unstable resin temperature also cause longitudinal thickness fluctuation.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Maintain the main motor and transmission belt; ②repair the haul-off device; ③check the temperature control stability of the heater; ④fix the freeze line position after adjustment.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Longitudinal thickness fluctuation is mostly related to mechanical transmission; for periodic fluctuation, troubleshooting the equipment components corresponding to the period is the most direct.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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