Processing Machinery
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Frequent Screen Change/Short Filter Screen Life of High-Density Polyethylene Extruder
Problem Phenomenon
The filter screen becomes clogged after a short use time and needs frequent replacement.
Frequent screen change affects production efficiency and also reflects high impurity content in the raw material or improper process parameters.
Cause Analysis
（1）The impurity content in the raw material is high
（2）The regrind contains carbides or other impurities
（3）The barrel temperature is too high, and the material is partially carbonized
（4）The filter screen mesh count is too high or there are too many layers
（5）The filler in the raw material is unevenly dispersed, forming agglomerates
Solution
（1）Strengthen raw material screening and impurity removal, and install a magnetic rack on the hopper
（2）Sieve the regrind before use to remove carbides
（3）Control the barrel temperature within the 180-260°C range to avoid overheating and carbonization
（4）Select a filter screen with a 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 filter screen clogging is caused by raw material impurities or improper processes, and needs to be solved from raw material management and temperature control.
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