Extrusion & Post
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EVOH extrusion feeding is unstable
Problem Phenomenon
EVOH extrusion feeding amount fluctuates ±15%, causing unstable extrusion pressure and product dimensions
Cause Analysis
Irregular EVOH pellet shape causing unstable filling rate of the feeding screw; bridging or voids in the hopper; feeding screw design unsuitable
Solution
1) Use a loss-in-weight feeder to precisely control feeding amount; 2) Install a vibrator on the hopper to prevent bridging; 3) Pelletize EVOH to uniform 2-3mm particle size; 4) Change the feeding screw to a dedicated design
Key Takeaway
Unstable feeding is caused by pellet characteristics; loss-in-weight feeding and anti-bridging are core
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