Extrusion & Post
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Melt flow rate mismatch of raw material for random copolymer polypropylene extrusion
Problem Phenomenon
After using a certain batch of raw material, extrusion process parameters need major adjustment and product quality fluctuates.
MFR mismatch makes the original process parameters inapplicable, affecting production efficiency.
Cause Analysis
(1) Raw material MFR is on the low side, resulting in high extrusion energy consumption and low output
(2) Raw material MFR is on the high side, resulting in decreased product mechanical properties
(3) Mixing raw materials of different grades results in inconsistent MFR
(4) Raw material is stored for too long and MFR changes
(5) MFR fluctuates greatly between raw material batches
Solution
(1) Select extrusion-grade grades with suitable MFR; random copolymer polypropylene extrusion usually selects MFR 0.3-5g/10min
(2) Test MFR for each batch of raw material and match it with process requirements
(3) Avoid mixing different grades; conduct tests first if mixing is necessary
(4) Use raw materials within the shelf life
(5) Appropriately increase barrel temperature when MFR is on the low side
(6) Appropriately decrease barrel temperature when MFR is on the high side
Key Takeaway
MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.
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