Processing Machinery
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Melt Pressure Fluctuation of PBT Extruder
Problem Phenomenon
The melt pressure of the extruder fluctuates periodically or randomly, and the product thickness changes.
Cause Analysis
The screw speed fluctuates; the feeding is uneven (inconsistent particle sizes, poor feeding); the filter gradually clogs.
Solution
Stabilize the screw speed; use a metering feeder; replace the filter regularly; control the feeding section temperature to prevent bridging.
Key Takeaway
PBT extrusion pressure stability is the prerequisite for dimension control.
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