Extrusion & Post
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Melt flow rate mismatch of raw materials for polyolefin plastomer extrusion
Problembeschreibung
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.
Ursachenanalyse
（1）The raw material MFR is too low, the extrusion energy consumption is large, and the output is low
（2）The raw material MFR is too high and the mechanical properties of the product decline
（3）Different grades of raw materials 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
Lösung
（1）Select extrusion grades with suitable MFR; polyolefin plastomer extrusion usually selects MFR 0.3-5g/10min
（2）Test the MFR of each batch of raw material to match the process requirements
（3）Avoid mixing different grades; if they must be mixed, do a test first
（4）Use the raw material within the shelf life
（5）Appropriately raise the barrel temperature when the MFR is too low
（6）Appropriately lower the barrel temperature when the MFR is too high
Wichtigste Erkenntnis
MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.
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