Extrusion & Post
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Unstable output/surging in the linear low-density polyethylene extrusion process
Problem Phenomenon
Extruder output varies from more to less, the extrudate is uneven in thickness, and periodic surging occurs.
Unstable output directly affects product dimensional accuracy and quality consistency.
Cause Analysis
(1) Screw feeding section conveying is unstable, and the solid bed breaks
(2) Hopper feeding is not smooth, and raw material bridges
(3) Improper barrel temperature setting; feeding section temperature is too high or too low
(4) Screw speed fluctuates
(5) Raw material particle size is uneven or contains too much powder
Solution
(1) Optimize barrel temperature distribution; appropriately lower the feeding section temperature to prevent premature melting
(2) Install a vibrator on the hopper to prevent bridging and ensure continuous feeding
(3) Reasonably set the temperature of each barrel section to ensure it is within the 190-250°C range
(4) Check the extruder drive system and stabilize screw speed
(5) Control raw material particle uniformity, with powder proportion not exceeding 5%
Key Takeaway
Unstable output is caused by unstable solid conveying; barrel temperature and the feeding system need to be optimized.
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