Extrusion & Post
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HDPE film blowing cooling
Problem Phenomenon
HDPE film has poor transparency and poor opening property
Cause Analysis
Improper air volume and air temperature of the cooling air ring, and the crystallization state affects transparency and opening; 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
Uniform air ring air volume; air temperature control; optimization of the film bubble freeze line height; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, to facilitate locating effective measures
Key Takeaway
Film optics and opening property rely on cooling control; 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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