Extrusion & Post
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Unstable output/surging in linear low density polyethylene extrusion process (Variant: strengthened measures)
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.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires key attention.
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
(6) On the original basis, additional attention is needed as process parameter fluctuations or equipment status changes have aggravated this problem
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 190-250°C range
(4) Check the extruder drive system, stabilize screw rotation speed
(5) Control raw material particle uniformity, powder ratio not exceeding 5%
(6) And strengthen process monitoring; on the original basis, additional attention is needed, with special attention to parameter stability
Key Takeaway
Unstable output is caused by unstable solids conveying; barrel temperature and feeding system need to be optimized.
Targeted preventive measures need to be taken in different production scenarios.
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