Hot melt flow path
Service
5-13
Part 1126931_01
2018 Nordson Corporation
Replacing the Adhesive Filter
DuraBlue II melters are equipped with a 100-mesh (0.15-mm) disposable
hot melt adhesive filter. The adhesive 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:
the type, grade, and purity of the solid-form hot melt
the set point temperature of the tank
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:
the purity of the dispensed hot melt
increases in operating pressure
the frequency of applicator nozzle replacement or cleaning
As an aid to ensuring that the filter is replaced at the end of its service life, the
melter is equipped with a service LED that turns on at the end of a
customer-defined time period. Refer to Setting Up the Melter in Section 3,
Installation, for information about the service interval time.
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