Hot melt flow path
Maintenance
5-6
Part 1073401_07
E 2021 Nordson Corporation
Replacing the Filter
Some DuraBlue melters are equipped with a 100‐mesh (0.15‐mm)
disposable hot melt filter. The filter removes debris and char from the hot
melt as it flows from the tank. Hot melt flows from the inside to the outside of
the filter, trapping contaminants inside the filter. There is no need to
back‐flush or clean the filter.
When the filter reaches the end of its service life, it should be replaced. The
factors that determine the service life of the filter are:
S the type, grade, and purity of the solid‐form hot melt
S the set point temperature of the tank
S the period of time that the hot melt remains in the tank
The filter should also be replaced when making the change to a different type
or grade of hot melt.
To determine the optimal service life for the filter, monitor and compare the
total number of hours that the heaters are on with observations of:
S the purity of the dispensed hot melt
S increases in operating pressure
S the frequency of applicator nozzle replacement or cleaning
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