Extrusion & Post
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Unstable Dimensions in CMC Extrusion
Problem Phenomenon
Cross-sectional dimension of CMC extruded products fluctuates ±10%, and there are also periodic changes in the length direction
Cause Analysis
Feeding amount is unstable and 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 accuracy ±1°C for each extruder zone temperature; 3)Closed-loop control of haul-off speed linked with extrusion speed; 4)Processing temperature controlled at 20-25±5°C
Key Takeaway
Extrusion dimensional stability depends on feeding accuracy, temperature control and haul-off synchronization
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