Extrusion & Post
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HDPE film blowing temperature
Problem Phenomenon
HDPE blown film bubble is unstable and uneven in thickness
Cause Analysis
Extrusion temperature fluctuation changes the melt viscosity, and the film bubble stability is poor; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Extrusion temperature is stably controlled at 180-230℃; the die head temperature is uniform; the air ring air volume is stable; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Stable film blowing temperature is the prerequisite for film bubble stability; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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