Extrusion & Post
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Die Head Pressure Fluctuation of Polypropylene Extruder
Problem Phenomenon
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.
Cause Analysis
(1) The screw discharge 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 installed improperly
(5) There are many impurities in the raw material, frequently clogging the filter screen
Solution
(1) Stabilize the screw speed and barrel temperature to ensure uniform discharge
(2) Regularly replace the filter screen and establish a replacement cycle
(3) Stabilize the die head temperature, with fluctuation controlled within ±3°C (range 200-280°C)
(4) Check the breaker plate; replace it if deformed, and ensure it is installed in place
(5) Sieve the raw material before use, and install a magnetic frame on the hopper to remove impurities
Key Takeaway
Die head pressure fluctuation is caused by unstable discharge or filtration system problems; the extrusion parameters need to be stabilized and the filtration system maintained.
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