Extrusion & Post
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Random copolymer polypropylene pipe special material (Nordic standard） extrusion raw material melt flow rate mismatch（Variant: Strengthened Measures）
Problem Phenomenon
After using a certain batch of raw material, the extrusion process parameters need major adjustment, and product quality fluctuates.
MFR mismatch makes the original process parameters inapplicable, affecting production efficiency.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Cause Analysis
（1）The raw material MFR is too low, extrusion energy consumption large and output low\
（2）The raw material MFR is too high, product mechanical properties decline\
（3）Different grades of raw material mixed, MFR inconsistent\
（4）Raw material stored too long, MFR has changed\
（5）MFR fluctuates greatly between raw material batches\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1）Select an extrusion grade with suitable MFR; extrusion of the random copolymer polypropylene pipe special material (Nordic standard） usually selects MFR 0.3-5g/10min\
（2）Test the MFR of each batch of raw material, matching the process requirements\
（3）Avoid mixing different grades; if mixing is necessary, conduct a test first\
（4）Use the raw material within its shelf life\
（5）When the MFR is too low, appropriately increase the barrel temperature\
（6）When the MFR is too high, appropriately lower the barrel temperature\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Key Takeaway
MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.Targeted preventive measures need to be taken in different production scenarios.
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