Injection Molding
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Processing Difficulties Caused by Melt Flow Rate Mismatch of High-Density Polyethylene Raw Material
Fenómeno del problema
After using a certain batch of raw material, injection filling becomes 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.
Análisis de la causa
(1) The MFR of the raw material is low, the melt viscosity is high, and mold filling is difficult, requiring higher pressure
(2) The MFR of the raw material is high, the melt viscosity is low, and flash is easy to occur
(3) The raw material grade is selected improperly, 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
Solución
(1) Select a grade with a suitable MFR; for '2079851475616104452 high-density polyethylene, MFR 1-30g/10min is usually selected
(2) Test the MFR of each batch of raw material, and use it after matching the process requirements
(3) Avoid mixing raw materials of different grades; test and verify when mixing is necessary
(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
Conclusión clave
MFR mismatch needs to be solved by selecting a suitable grade and adjusting process parameters; the key is to establish an incoming MFR inspection system.
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