Extrusion & Post
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Unstable dimensions in PVA extrusion
Problem Phenomenon
Cross-sectional dimensions of PVA extruded products fluctuate ±10%, with periodic changes in the length direction
Cause Analysis
Feed amount unstable, feed screw speed fluctuates; extrusion temperature fluctuates periodically ±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 precision ±1°C; 3) Closed-loop control of haul-off speed linked with extrusion speed; 4) Control processing temperature at 140-200±5°C
Key Takeaway
Extrusion dimensional stability depends on feeding precision, temperature control and haul-off synchronization
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