Extrusion & Post
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Die Head Pressure Fluctuation of High-Density Polyethylene Extruder
Problembeschreibung
The die head pressure gauge reading fluctuates greatly, and the pressure is unstable.
Die head pressure fluctuation directly causes dimensional fluctuation and surface defects of the extrudate, and is an important indicator of extrusion instability.
Ursachenanalyse
（1）The screw output is uneven, and the melt pressure fluctuates
（2）The filter screen is clogged or damaged
（3）The die head temperature fluctuates greatly, and the melt viscosity changes
（4）The breaker plate is deformed or improperly installed
（5）The raw material contains many impurities, frequently clogging the filter screen
Lösung
（1）Stabilize the screw rotation speed and barrel temperature to ensure uniform output
（2）Regularly replace the filter screen and establish a replacement cycle
（3）Stabilize the die head temperature, with the fluctuation controlled within ±3°C (180-260°C range)
（4）Check the breaker plate, replace it if deformed, and ensure proper installation
（5）Sieve the raw material before use, and install a magnetic rack on the hopper to remove impurities
Wichtigste Erkenntnis
Die head pressure fluctuation is caused by unstable output or filtration system problems, and the extrusion parameters need to be stabilized and the filtration system maintained.
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