Processing Machinery
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Frequent screen changes/short screen life of polyolefin plastomer extruders (Variant: Enhanced Measures)
Problem Phenomenon
The screen becomes clogged after a short use time and needs to be replaced frequently.
Frequent screen changes affect production efficiency and also reflect high impurity content in the raw material or improper process parameters.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
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 screen mesh is too high or there are too many layers
（5）The filler in the raw material is unevenly dispersed, forming agglomerates
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Solution
（1）Strengthen raw material screening and impurity removal, and install a magnetic frame on the hopper
（2）Screen the regrind before use to remove carbides
（3）Control the barrel temperature within the range of 180-230°C to avoid overheating and carbonization
（4）Select a screen with a suitable mesh, 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
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
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.
Targeted preventive measures need to be taken in different production scenarios.
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