Extrusion & Post
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Melt Flow Rate Mismatch of Raw Material for High-Density Polyethylene 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 raw material MFR is low, resulting in high extrusion energy consumption and low output
（2）The raw material MFR is 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
Solution
（1）Select an extrusion-grade grade with suitable MFR; high-density polyethylene extrusion usually selects MFR 0.3-5g/10min
（2）Test the MFR of each batch of raw material and match it with the process requirements
（3）Avoid mixing different grades; if mixing is necessary, conduct tests first
（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 suitable grades and adjusting temperature parameters.
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