Extrusion & Post
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Die head pressure fluctuation of low density polyethylene extruder
Problem Phenomenon
Die head pressure gauge reading fluctuates greatly, pressure unstable.
Die head pressure fluctuation directly causes extrudate dimensional fluctuation and surface defects, and is an important indicator of extrusion instability.
Cause Analysis
(1) Uneven screw output, melt pressure fluctuation
(2) Filter screen clogged or damaged
(3) Large die head temperature fluctuation, melt viscosity changes
(4) Breaker plate deformed or improperly installed
(5) Many impurities in raw material, frequently clogging filter screens
Solution
(1) Stabilize screw rotation speed and barrel temperature, ensure uniform output
(2) Regularly replace filter screens, establish a replacement cycle
(3) Stabilize die head temperature, control fluctuation within ±3°C (160-220°C range)
(4) Check the breaker plate; replace if deformed, ensure proper installation
(5) Sieve raw material before use, install magnetic grate on the hopper to remove impurities
Key Takeaway
Die head pressure fluctuation is caused by unstable output or filtration system problems; extrusion parameters need to be stabilized and the filtration system maintained.
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