Extrusion & Post
4 조회수
Head pressure fluctuation of linear low-density polyethylene extruder
문제 현상
The head pressure gauge reading fluctuates greatly and the pressure is unstable.
Head pressure fluctuation directly causes extrudate dimensional fluctuation and surface defects and is an important indicator of extrusion instability.
원인 분석
(1) Screw output is uneven and melt pressure fluctuates
(2) The screen is clogged or damaged
(3) Head temperature fluctuates greatly and melt viscosity changes
(4) The breaker plate is deformed or improperly installed
(5) The raw material contains many impurities, frequently clogging the screen
해결 방법
(1) Stabilize screw speed and barrel temperature to ensure uniform output
(2) Regularly replace the screen and establish a replacement cycle
(3) Stabilize head temperature, controlling fluctuation within ±3°C (190-250°C range)
(4) Check the breaker plate; replace if deformed and ensure proper installation
(5) Sieve the raw material before use, and install a magnetic rack on the hopper to remove impurities
핵심 요약
Head pressure fluctuation is caused by unstable output or filtration system problems; extrusion parameters need to be stabilized and the filtration system maintained.
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