Extrusion & Post
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TPU Film Extrusion
Problem Phenomenon
TPU film extrusion has uneven thickness and many gel particles
Cause Analysis
Poor melt uniformity and possible unmelted particles; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Melt temperature guaranteed; denser filter screens; precise adjustment of die gap; 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
TPU film relies on melt quality and die precision; 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 problems in the future
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