Extrusion & Post
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Random copolymer polypropylene pipe special material (Nordic standard） extruder die head pressure fluctuation
Problem Phenomenon
The die head pressure gauge reading fluctuates greatly and the pressure is unstable.
Die head pressure fluctuation directly causes extrudate dimensional fluctuation and surface defects, and is an important indicator of extrusion instability.
Cause Analysis
（1）The screw output is uneven, melt pressure fluctuates\
（2）The filter screen is clogged or damaged\
（3）The die head temperature fluctuates greatly, melt viscosity changes\
（4）The breaker plate is deformed or improperly installed\
（5）The raw material contains many impurities, frequently clogging the filter screen
Solution
（1）Stabilize the screw speed and barrel temperature, ensure uniform output\
（2）Regularly replace the filter screen, establish a replacement cycle\
（3）Stabilize the die head temperature, fluctuation controlled within ±3°C (200-220°C range)\
（4）Check the breaker plate, replace if deformed, ensure proper installation\
（5）Sieve the raw material before use, install a magnetic rack on the hopper to remove impurities
Key Takeaway
Die head pressure fluctuation is caused by unstable output or filtration system problems, requiring stabilization of extrusion parameters and maintenance of the filtration system.
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