Extrusion & Post
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Melt flow rate mismatch of raw materials for random copolymer polypropylene pipe special material extrusion (Variant: strengthened measures)
Problem Phenomenon
After using a certain batch of raw material, the extrusion process parameters need to be greatly adjusted, and the product quality fluctuates.
The MFR mismatch makes the original process parameters inapplicable, affecting production efficiency.
In particular, extra attention is needed on the original basis, this problem is more prominent and needs key attention.
Cause Analysis
（1）The raw material MFR is low, the extrusion energy consumption is large, and the output is low
（2）The raw material MFR is high, and the mechanical properties of the product decrease
（3）Different grades of raw materials are mixed, and the MFR is inconsistent
（4）The raw material has been stored for too long, and the MFR has changed
（5）The MFR fluctuates greatly between batches of raw materials
（6）On the original basis, extra attention is needed: process parameter fluctuations or equipment status changes have aggravated this problem
Solution
（1）Select an extrusion grade with suitable MFR, random copolymer polypropylene pipe special material 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, and do a test first when mixing is necessary
（4）Use the raw material within the shelf life
（5）When the MFR is low, appropriately raise the barrel temperature
（6）When the MFR is high, appropriately lower the barrel temperature
（6）And strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
Key Takeaway
MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.
In different production scenarios, targeted preventive measures need to be taken.
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