Extrusion & Post
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Unstable output/surging in low density polyethylene extrusion process
Problem Phenomenon
Extruder output is sometimes more sometimes less, extrudate thickness is uneven, and periodic surging occurs.
Unstable output directly affects product dimensional accuracy and quality consistency.
Cause Analysis
(1) Unstable conveying in the screw feed section, solid bed breakup
(2) Poor hopper feeding, raw material bridging
(3) Improper barrel temperature setting; feed zone temperature too high or too low
(4) Screw rotation speed fluctuation
(5) Uneven raw material particle size or excessive powder content
Solution
(1) Optimize barrel temperature distribution; appropriately reduce feed zone temperature to prevent premature melting
(2) Install a vibrator on the hopper to prevent bridging, ensure continuous feeding
(3) Reasonably set the temperature of each barrel zone, ensure within the 160-220°C range
(4) Check the extruder drive system, stabilize screw rotation speed
(5) Control raw material particle uniformity, powder ratio not exceeding 5%
Key Takeaway
Unstable output is caused by unstable solids conveying; barrel temperature and feeding system need to be optimized.
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