Processing Machinery
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Frequent screen change/short filter screen life of low density polyethylene extruder
Problem Phenomenon
Filter screens clog after short use and need frequent replacement.
Frequent screen changes affect production efficiency and also reflect high impurity content in raw material or improper process parameters.
Cause Analysis
(1) High impurity content in raw material
(2) Regrind contains carbides or other impurities
(3) Barrel temperature too high, material partially carbonized
(4) Filter screen mesh count too high or too many layers
(5) Uneven filler dispersion in raw material forming agglomerates
Solution
(1) Strengthen raw material screening and impurity removal, install magnetic grate on the hopper
(2) Sieve regrind before use to remove carbides
(3) Control barrel temperature within the 160-220°C range, avoid overheating carbonization
(4) Select filter screens with appropriate mesh count, generally 40-80 mesh
(5) Optimize raw material formulation, ensure uniform filler dispersion
(6) Consider using automatic screen changers to reduce downtime
Key Takeaway
Frequent filter screen clogging is caused by raw material impurities or improper process; it needs to be solved from raw material management and temperature control.
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