Processing Machinery
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Frequent screen change/short screen pack life of heat-resistant polyethylene extruder
Problem Phenomenon
The screen pack clogs after a short service time and needs frequent replacement.
Frequent screen changes affect production efficiency and also reflect high impurity content in the raw material or improper process parameters.
Cause Analysis
(1) High impurity content in raw material
(2) Regrind contains carbonized matter or other impurities
(3) Barrel temperature too high, material partially carbonized
(4) Screen pack mesh too high or too many layers
(5) Fillers in raw material unevenly dispersed forming agglomerates
Solution
(1) Strengthen raw material screening and impurity removal, install a magnetic grate on the hopper
(2) Sieve regrind before use to remove carbonized matter
(3) Control barrel temperature within 190-230°C to avoid overheating carbonization
(4) Select a screen pack with suitable mesh, generally 40-80 mesh
(5) Optimize raw material formulation to ensure uniform filler dispersion
(6) Consider using an automatic screen changer to reduce downtime
Key Takeaway
Frequent screen pack 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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