Processing Machinery
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Frequent screen change/short screen life of linear low-density polyethylene extruder
Problem Phenomenon
The screen clogs after a short time of use and needs frequent replacement.
Frequent screen changes affect production efficiency and also reflect high impurity content in raw materials or improper process parameters.
Cause Analysis
(1) Raw material has high impurity content
(2) Regrind contains carbides or other impurities
(3) Barrel temperature is too high, and the material partially carbonizes
(4) The screen mesh count is too high or there are too many layers
(5) Fillers in the raw material are unevenly dispersed, forming agglomerates
Solution
(1) Strengthen raw material screening and impurity removal, and install a magnetic rack on the hopper
(2) Sieve regrind before use to remove carbides
(3) Control barrel temperature within the 190-250°C range to avoid overheating carbonization
(4) Select screens with suitable mesh count, generally 40-80 mesh
(5) Optimize the raw material formulation to ensure uniform filler dispersion
(6) Consider using an automatic screen changer to reduce downtime
Key Takeaway
Frequent screen clogging is caused by raw material impurities or improper process and needs to be solved from raw material management and temperature control.
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