Extrusion & Post
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Unstable dimensions in EVA extrusion
Problem Phenomenon
EVA extruded product cross-section dimensions fluctuate ±10% with periodic changes along the length
Cause Analysis
Unstable feeding amount with feeding screw speed fluctuation; extrusion temperature periodically fluctuating ±5°C; haul-off speed not matching extrusion speed
Solution
1) Use loss-in-weight feeder to ensure stable feeding; 2) PID control of each extruder zone temperature with ±1°C precision; 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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