Extrusion & Post
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DSTDP extrusion unstable dimensions
Problembeschreibung
DSTDP extruded product cross-sectional dimension fluctuates ±10%, with periodic variation along the length direction as well
Ursachenanalyse
Feeding amount unstable, feeding screw speed fluctuates; extrusion temperature periodically fluctuates ±5°C; haul-off speed not matched with extrusion speed
Lösung
1) Use 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 haul-off speed linked with extrusion speed; 4) control processing temperature at 160-200±5°C
Wichtigste Erkenntnis
Extrusion dimensional stability depends on feeding accuracy, temperature control and haul-off synchronization
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