Extrusion & Post
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Melt flow rate mismatch of raw material for heat-resistant polyethylene extrusion
Problem Phenomenon
After using a certain batch of raw material, the extrusion process parameters need to be greatly adjusted and product quality fluctuates.
MFR mismatch makes the original process parameters inapplicable, affecting production efficiency.
Cause Analysis
(1) Raw material MFR too low, high extrusion energy consumption and low output
(2) Raw material MFR too high, product mechanical properties decrease
(3) Different grades of raw materials mixed, MFR inconsistent
(4) Raw material stored too long, MFR changes
(5) Large batch-to-batch MFR fluctuation of raw material
Solution
(1) Select extrusion grades with suitable MFR, heat-resistant polyethylene extrusion usually selects MFR 0.3-5g/10min
(2) Test MFR of each batch of raw material to match process requirements
(3) Avoid mixing different grades, test first if mixing is necessary
(4) Use raw materials within the shelf life
(5) Appropriately increase barrel temperature when MFR is low
(6) Appropriately reduce barrel temperature when MFR is high
Key Takeaway
MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.
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