Injection Molding
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Processing Difficulty Caused by Melt Flow Rate Mismatch of Low-Density Polyethylene Raw Material
Problem Phenomenon
After using a certain batch of raw material, injection mold filling is difficult or flash increases, and the process parameters need to be greatly adjusted.
MFR mismatch makes the original process parameters inapplicable, affecting production efficiency and product quality.
Cause Analysis
（1）The raw material MFR is low, the melt viscosity is high, and mold filling is difficult and requires higher pressure
（2）The raw material MFR is high, the melt viscosity is low, and flash is easily produced
（3）The raw material grade is improperly selected, and the MFR range does not match the product requirements
（4）Different grades are mixed, and the MFR is inconsistent
（5）The raw material is stored for too long, and the MFR changes
Solution
（1）Select a grade with suitable MFR; '2079851475616104452 of low-density polyethylene usually selects MFR 1-30g/10min
（2）Test the MFR of each batch of raw material, and use it after matching with the process requirements
（3）Avoid mixing different grades of raw materials; if mixing is necessary, testing and verification are required
（4）When the MFR is low, appropriately increase the barrel temperature and injection pressure
（5）When the MFR is high, appropriately reduce the barrel temperature and injection pressure
（6）Use the raw material within the shelf life and avoid storing it for too long
Key Takeaway
MFR mismatch needs to be solved by selecting suitable grades and adjusting process parameters, and the key is to establish an incoming material MFR inspection system.
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