Extrusion & Post
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Unstable EEA extrusion dimensions
Problem Phenomenon
EEA extruded product cross-section dimensions fluctuate ±10%, with periodic changes along the length direction
Cause Analysis
Unstable feeding amount, feeding screw speed fluctuating; extrusion temperature periodically fluctuating ±5°C; haul-off speed not matching extrusion speed
Solution
1) Use gravimetric feeder to ensure stable feeding; 2) PID control of each extruder section temperature with accuracy ±1°C; 3) Closed-loop control of haul-off speed linked with extrusion speed; 4) Control processing temperature at 160-210±5°C
Key Takeaway
Extrusion dimensional stability depends on feeding accuracy, temperature control and haul-off synchronization
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