Extrusion & Post
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Unstable feeding in PU extrusion
Problem Phenomenon
PU extrusion feed amount fluctuates ±15%, causing unstable extrusion pressure and product dimensions
Cause Analysis
Irregular PU 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 feed amount; 2) Install vibrator on hopper to prevent bridging; 3) Granulate PU to uniform particle size of 2-3mm; 4) Change feed screw to special design
Key Takeaway
Unstable feeding is caused by particle characteristics; loss-in-weight feeding and anti-bridging are the core
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