Extrusion & Post
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POE extrusion dimensional instability
Problem Phenomenon
POE extruded product cross-section dimension fluctuates ±10%, with periodic changes in the length direction as well
Cause Analysis
Feeding amount unstable, feeding screw speed fluctuates; extrusion temperature periodically fluctuates ±5°C; haul-off speed does not match extrusion speed
Solution
1) Use loss-in-weight feeder to ensure stable feeding; 2) PID control of each extruder zone temperature with accuracy ±1°C; 3) Closed-loop control of haul-off speed linked with extrusion speed; 4) Control processing temperature at 160-200±5°C
Key Takeaway
Extrusion dimensional stability depends on feeding accuracy, temperature control and haul-off synchronization
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