Extrusion & Post
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Melt flow rate mismatch of raw material for homopolymer polypropylene extrusion
Problem Phenomenon
After using a certain batch of raw material, extrusion process parameters need substantial adjustment, 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; decreased product mechanical properties
(3) Mixing different grades of raw material, inconsistent MFR
(4) Raw material stored too long, MFR changed
(5) Large MFR fluctuation between raw material batches
Solution
(1) Select an extrusion grade with appropriate MFR; homopolymer polypropylene extrusion usually selects MFR 0.3-5g/10min
(2) Test MFR for each batch of raw material, match with process requirements
(3) Avoid mixing different grades; conduct tests first if mixing is necessary
(4) Use raw material within the shelf life
(5) Appropriately increase barrel temperature when MFR is too low
(6) Appropriately reduce barrel temperature when MFR is too high
Key Takeaway
MFR mismatch needs to be solved by selecting appropriate grades and adjusting temperature parameters.
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