Extrusion & Post
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Unstable PVA extrusion feeding
Problembeschreibung
PVA extrusion feeding amount fluctuates ±15%, causing unstable extrusion pressure and product dimensions
Ursachenanalyse
Irregular PVA pellet shape causes unstable filling rate of the feed screw; bridging or voids in the hopper; feed screw design unsuitable
Lösung
1) Use loss-in-weight feeder to precisely control feeding amount; 2) Install vibrator on the hopper to prevent bridging; 3) Granulate PVA to uniform 2-3mm particle size; 4) Change feed screw to a dedicated design
Wichtigste Erkenntnis
Unstable feeding is caused by pellet characteristics; loss-in-weight feeding and anti-bridging are the core
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