Extrusion & Post
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CEF extrusion dimensional instability
Fenómeno do problema
The cross-sectional dimensions of the CEF extruded product fluctuate ±10%, and there are also periodic changes in the length direction
Análise das causas
The feeding amount is unstable and the feeding screw speed fluctuates; the extrusion temperature fluctuates periodically ±5°C; the haul-off speed does not match the extrusion speed
Solução
1) Use a loss-in-weight feeder to ensure stable feeding; 2) PID control of the temperature of each section of the extruder with an accuracy of ±1°C; 3) Closed-loop control of the haul-off speed linked with the extrusion speed; 4) Control the processing temperature at 160-220±5°C
Conclusão principal
Extrusion dimensional stability depends on feeding accuracy, temperature control and haul-off synchronization
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