Extrusion & Post
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Die head pressure fluctuation of random copolymer polypropylene pipe special material extruder (Variant: mass production scenario)
Fenómeno do problema
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.
In particular, in continuous mass production, this problem is more prominent and needs key attention.
Análise das causas
（1）The screw output is uneven, and the melt pressure fluctuates
（2）The filter screen is blocked or broken
（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 blocking the filter screen
（6）In continuous mass production, process parameter fluctuations or equipment status changes have aggravated this problem
Solução
（1）Stabilize the screw 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, and control the fluctuation within ±3°C (within the range of 200-220°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
（6）And establish standardized work instructions, with special attention to parameter stability in continuous mass production
Conclusão principal
Die head pressure fluctuation is caused by unstable output or filter system problems, and the extrusion parameters need to be stabilized and the filter system maintained.
In different production scenarios, targeted preventive measures need to be taken.
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