Extrusion & Post
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Unstable feeding in EVA extrusion
Problem Phenomenon
EVA extrusion feeding amount fluctuates ±15%, causing unstable extrusion pressure and product dimensions
Cause Analysis
EVA pellets irregular in shape causing unstable filling rate of feeding screw; bridging or voids in hopper; feeding screw design unsuitable
Solution
1) Use loss-in-weight feeder to precisely control feeding amount; 2) Install vibrator on hopper to prevent bridging; 3) Pelletize EVA to uniform 2-3mm particle size; 4) Change feeding screw to 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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