Injection Molding
4 조회수
Mismatch of the melt flow rate of general-purpose polyethylene raw material causing processing difficulties
문제 현상
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.
The MFR mismatch makes the original process parameters inapplicable, affecting production efficiency and product quality.
원인 분석
（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 easy to occur
（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 has been stored for too long, and the MFR has changed
해결 방법
（1）Select a grade with suitable MFR, general-purpose polyethylene for '2079851475616104452 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, and testing and verification are required when mixing is necessary
（4）When the MFR is low, appropriately raise the barrel temperature and injection pressure
（5）When the MFR is high, appropriately lower the barrel temperature and injection pressure
（6）Use the raw material within the shelf life to avoid prolonged storage
핵심 요약
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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