Extrusion & Post
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Melt flow rate mismatch of raw material for linear low density polyethylene extrusion (Variant: strengthened measures)
Problembeschreibung
After using a certain batch of raw material, extrusion process parameters need substantial adjustment, and product quality fluctuates.
MFR mismatch makes the original process parameters inapplicable, affecting production efficiency.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires key attention.
Ursachenanalyse
(1) Raw material MFR too low; high extrusion energy consumption and low output
(2) Raw material MFR too high; decreased product mechanical properties
(3) Mixing different grades of raw material, inconsistent MFR
(4) Raw material stored too long, MFR changed
(5) Large MFR fluctuation between raw material batches
(6) On the original basis, additional attention is needed as process parameter fluctuations or equipment status changes have aggravated this problem
Lösung
(1) Select an extrusion grade with appropriate MFR; linear low density polyethylene extrusion usually selects MFR 0.3-5g/10min
(2) Test MFR for each batch of raw material, match with process requirements
(3) Avoid mixing different grades; conduct tests first if mixing is necessary
(4) Use raw material within the shelf life
(5) Appropriately increase barrel temperature when MFR is too low
(6) Appropriately reduce barrel temperature when MFR is too high
(6) And strengthen process monitoring; on the original basis, additional attention is needed, with special attention to parameter stability
Wichtigste Erkenntnis
MFR mismatch needs to be solved by selecting appropriate grades and adjusting temperature parameters.
Targeted preventive measures need to be taken in different production scenarios.
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