Processing Machinery
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TPU Barrel Residual Pressure
Problem Phenomenon
After TPU shutdown and restart, the first shot has drooled material
Cause Analysis
Barrel residual pressure makes the melt seep out and oxidize; 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
Screw retraction to release pressure before shutdown; empty shots to purge clean upon restart; 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
Release pressure at shutdown and purge clean at start-up; 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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