Extrusion & Post
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Dimensional fluctuation of heat-resistant polyethylene extruded products
Problem Phenomenon
The outer diameter, wall thickness or width of the extruded product fluctuates periodically or randomly in the longitudinal direction.
Dimensional fluctuation affects the fitting accuracy and use performance of products, and is common in pipe and profile extrusion.
Cause Analysis
(1) Screw rotation speed unstable, output fluctuates
(2) Haul-off speed unstable, not matching extrusion speed
(3) Barrel temperature fluctuates greatly, melt viscosity changes
(4) Raw material feeding uneven, feeding fluctuation
(5) Cooling water temperature or flow fluctuation
Solution
(1) Check the extruder drive system, stabilize screw rotation speed
(2) Check the haul-off machine speed control system to ensure stable haul-off speed
(3) Stabilize barrel temperature, fluctuation controlled within ±3°C (190-230°C range)
(4) Check hopper feeding to ensure continuous and uniform feeding
(5) Stabilize cooling water temperature and flow, add a constant temperature device if necessary
Key Takeaway
Dimensional fluctuation is caused by unstable extrusion or haul-off, and each process parameter needs to be systematically stabilized.
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