Extrusion & Post
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MP extrusion dimensional instability
Problem Phenomenon
MP extruded product cross-section dimensions fluctuate ±10%, with periodic variation in the length direction as well
Cause Analysis
feeding amount unstable, feed screw speed fluctuates; extrusion temperature periodically fluctuates ±5°C; haul-off speed mismatched with 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 processing temperature at 150-170±5°C
Key Takeaway
extrusion dimensional stability depends on feeding accuracy, temperature control and haul-off synchronization
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