Extrusion & Post
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Dimensional fluctuation of polyolefin plastomer extruded products
Problem Phenomenon
The outer diameter, wall thickness, or width of the extruded product shows periodic or random fluctuations in the longitudinal direction.
Dimensional fluctuation affects the fitting accuracy and service performance of the product and is common in pipe and profile extrusion.
Cause Analysis
（1）The screw speed is unstable and the discharge output fluctuates
（2）The hauling speed is unstable and does not match the extrusion speed
（3）The barrel temperature fluctuates greatly and the melt viscosity changes
（4）The raw material feeding is uneven and the feeding fluctuates
（5）The cooling water temperature or flow rate fluctuates
Solution
（1）Check the extruder drive system and stabilize the screw speed
（2）Check the speed regulation system of the haul-off machine to ensure stable hauling speed
（3）Stabilize the barrel temperature, with the fluctuation controlled within ±3°C (180-230°C range)
（4）Check the hopper feeding to ensure continuous and uniform feeding
（5）Stabilize the cooling water temperature and flow rate, and add a constant temperature device when necessary
Key Takeaway
Dimensional fluctuation is caused by unstable extrusion or hauling, and all process parameters need to be systematically stabilized.
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