Extrusion & Post
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Unstable PVA extrusion feeding
Problem Phenomenon
PVA extrusion feeding amount fluctuates ±15%, causing unstable extrusion pressure and product dimensions
Cause Analysis
Irregular PVA pellet shape causes unstable filling rate of the feed screw; bridging or voids in the hopper; feed screw design unsuitable
Solution
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
Key Takeaway
Unstable feeding is caused by pellet characteristics; loss-in-weight feeding and anti-bridging are the core
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