Extrusion & Post
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Die head pressure fluctuation of polyolefin plastomer extruders
Fenómeno do problema
The reading of the die head pressure gauge 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.
Análise das causas
（1）The screw discharge is uneven and the melt pressure fluctuates
（2）The 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 screen
Solução
（1）Stabilize the screw speed and barrel temperature to ensure uniform discharge
（2）Replace the screen regularly and establish a replacement cycle
（3）Stabilize the die head temperature, with the fluctuation controlled within ±3°C (180-230°C range)
（4）Check the breaker plate; replace it if deformed, and ensure it is installed in place
（5）Screen the raw material before use, and install a magnetic frame on the hopper to remove impurities
Conclusão principal
Die head pressure fluctuation is caused by unstable discharge or filtration system problems, and it is necessary to stabilize the extrusion parameters and maintain the filtration system.
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