Extrusion & Post
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Melt flow rate mismatch of raw material for cross-linked polyethylene extrusion (Variant: strengthened measures)
Fenómeno del problema
After using a certain batch of raw material, the extrusion process parameters need to be greatly adjusted and product quality fluctuates.
MFR mismatch makes the original process parameters inapplicable, affecting production efficiency.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Análisis de la causa
(1) Raw material MFR too low, high extrusion energy consumption and low output
(2) Raw material MFR too high, product mechanical properties decrease
(3) Different grades of raw materials mixed, MFR inconsistent
(4) Raw material stored too long, MFR changes
(5) Large batch-to-batch MFR fluctuation of raw material
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solución
(1) Select extrusion grades with suitable MFR, cross-linked polyethylene extrusion usually selects MFR 0.3-5g/10min
(2) Test MFR of each batch of raw material to match process requirements
(3) Avoid mixing different grades, test first if mixing is necessary
(4) Use raw materials within the shelf life
(5) Appropriately increase barrel temperature when MFR is low
(6) Appropriately reduce barrel temperature when MFR is high
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Conclusión clave
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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