Extrusion & Post
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Unstable Dimensions in PU Extrusion
Problem Phenomenon
PU extruded product cross-section dimensions fluctuate ±10%, with periodic changes in the length direction
Cause Analysis
Feeding amount unstable, feeding screw speed fluctuating; extrusion temperature periodically fluctuating ±5°C; haul-off speed mismatched with extrusion speed
Solution
1) Use loss-in-weight feeder to ensure stable feeding; 2) PID control of each extruder zone temperature with precision ±1°C; 3) Closed-loop control of haul-off speed linked with extrusion speed; 4) Control processing temperature at 60-120±5°C
Key Takeaway
Extrusion dimensional stability depends on feeding precision, temperature control and haul-off synchronization
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