Material Drying
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PBT Poor Metering
Problem Phenomenon
Product weight fluctuates, metering is unstable, and screw back time is sometimes long and sometimes short
Cause Analysis
PBT has good fluidity; unstable back pressure or check valve leakage causes metering fluctuations; changes in the drying state of the pellets affect plasticization; increased screw wear clearance is also a cause; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Set back pressure stably; ②Overhaul the check valve and screw wear; ③Standardize the drying state of the pellets; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT poor metering is investigated along three lines: back pressure, check valve, and drying; equipment wear is a chronic variable; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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