Extrusion & Post
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Die head pressure fluctuation of heat-resistant polyethylene extruder (Variant: strengthened measures)
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.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Screw output uneven, melt pressure fluctuates
(2) Screen pack clogged or broken
(3) Die head temperature fluctuates greatly, melt viscosity changes
(4) Breaker plate deformed or improperly installed
(5) Too many impurities in raw material, frequently clogging the screen pack
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(1) Stabilize screw rotation speed and barrel temperature to ensure uniform output
(2) Regularly replace the screen pack, establish a replacement cycle
(3) Stabilize die head temperature, fluctuation controlled within ±3°C (190-230°C range)
(4) Check the breaker plate, replace if deformed, ensure installation in place
(5) Sieve raw material before use, install a magnetic grate on the hopper to remove impurities
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Die head pressure fluctuation is caused by unstable output or filtration system problems, and extrusion parameters need to be stabilized and the filtration system maintained.
Targeted preventive measures need to be taken in different production scenarios.
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