Extrusion & Post
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Unstable dimensions in EAA extrusion
Problem Phenomenon
The cross-sectional dimensions of EAA extruded products fluctuate ±10%, and there are also periodic changes in the length direction
Cause Analysis
Unstable feeding amount, fluctuation of feeding screw speed; periodic fluctuation of extrusion temperature ±5°C; haul-off speed does not match the extrusion speed
Solution
1) Use a 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 the processing temperature at 180-240±5°C
Key Takeaway
Extrusion dimensional stability depends on feeding accuracy, temperature control and haul-off synchronization
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