Extrusion & Post
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Melt Flow Rate Mismatch of Raw Material for Polypropylene Extrusion
Problem Phenomenon
After using a certain batch of raw material, the extrusion process parameters need to be greatly adjusted, and the product quality fluctuates.
MFR mismatch makes the original process parameters inapplicable, affecting production efficiency.
Cause Analysis
(1) The MFR of the raw material is low, the extrusion energy consumption is large, and the output is low
(2) The MFR of the raw material is high, and the mechanical properties of the product decline
(3) Raw materials of different grades are mixed, and the MFR is inconsistent
(4) The raw material is stored for too long, and the MFR changes
(5) The MFR fluctuates greatly between batches of raw materials
Solution
(1) Select an extrusion-grade grade with a suitable MFR; for polypropylene extrusion, MFR 0.3-5g/10min is usually selected
(2) Test the MFR of each batch of raw material and match it with the process requirements
(3) Avoid mixing different grades; conduct a test first when mixing is necessary
(4) Use the raw material within the shelf life
(5) When the MFR is low, appropriately increase the barrel temperature
(6) When the MFR is high, appropriately reduce the barrel temperature
Key Takeaway
MFR mismatch needs to be solved by selecting a suitable grade and adjusting the temperature parameters.
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