Processing Machinery
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TPU screw slipping
Problem Phenomenon
During plasticization the screw slips and does not feed material, and output drops sharply.
Cause Analysis
Fault or bridging at the hopper feeding position; too high temperature at the rear of the barrel softens and sticks the pellets; too fast screw retreat speed also causes slipping; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①remove obstacles at the feeding position; ②reduce the temperature at the rear of the barrel; ③reduce the screw retreat speed; ④check pellet shape and drying state; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Screw slipping is a physical feeding obstacle; feed zone temperature management is the key to preventing TPU slipping; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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