Extrusion & Post
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EVOH extrusion dimensions are unstable
Problem Phenomenon
EVOH extruded product cross-sectional dimensions fluctuate ±10%, with periodic changes also in the length direction
Cause Analysis
Unstable feeding amount with feeding screw rotation speed fluctuation; extrusion temperature periodic fluctuation ±5°C; traction speed not matching 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 traction speed linked with extrusion speed; 4) Control processing temperature at 190-230±5°C
Key Takeaway
Extrusion dimensional stability depends on feeding accuracy, temperature control, and traction synchronization
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