Maintenance
5-6
Part 237478_03
E 2012 Nordson Corporation
Cleaning Swirl Nozzles
Nozzle clogging occurs when a filter screen is damaged or when there is
charred material in the hose or gun. Char may occur if adhesive is heated
above the application temperature recommended by the adhesive
manufacturer. If this occurs it may be necessary to replace the gun.
1. Relieve hydraulic pressure (refer to the Relieving Hydraulic Pressure in
Installation).
2. Ensure that the gun trigger safety is in the LOCKED position.
3. Move the applicator circuit breaker to the OFF position, then disconnect
and lock out input electrical power to the applicator (see Figures 5‐1 and
5‐2).
NOTE: Take care not to drop the swirl nozzle when removing the
retaining nut. Damage from dropping can cause the nozzle to produce
an abnormal pattern.
4. Loosen the nozzle retaining nut with a wrench, then remove the nozzle
and retaining nut with a gloved hand (see Figure 5‐3).
5. Place the nozzle in a container of TypeR fluid or equivalent. Use a
controlled heating device (such as a small, deep‐fat fryer or
thermostatically‐controlled hot plate) to heat the TypeR fluid above the
hot melt adhesive material melting temperature (see Figure5‐4).
NOTE: Another method for cleaning nozzles is to place the parts in an
ultrasonic cleaner filled with TypeR fluid.
6. Remove the nozzle from the cleaning fluid, then separate the nozzle disk
from the retaining nut and inspect the nozzle for warping and blockage.
NOTE: Prior to nozzle replacement, it may be advisable to trigger air
through the gun body to remove adhesive that may have entered an air
port. If this step is taken, slowly increase air pressure at the regulator to
34 or 69kPa (5 or 10psi). Trigger the gun, then turn the air regulator off.