Nordson 2302 - 13. Hot Melt Material Application Problems

Troubleshooting 6-23
13. Hot melt material
application problems
Problem
Adhesive
Spitting on
Extrusion
Possible Reason
Adhesive output exceeds maximum
continuous delivery rate of system
Hydraulic pressure set below
recommended minimum hydraulic
pressure
Corrective Action
Reduce output to maximum of 10
Ibs/hr (4.5 kg/hr)
Increase hydraulic pressure to at
least 300 psi (20 bar)
Refer to
Section 4
Waviness in
bead deposit
Adhesive in tank is cold or tank is low If adhesive is cold, either increase Section 4,
or empty and pump is drawing in air tank setpoint, or complete Tank, Hose Section 6
or Gun Fails to Heat or Underheats
troubleshooting procedure in this
Section; if tank is low, refill as
required.
Hot melt material in system is too cold
Increase setpoints to appropriate level Section 4
Ambient temperature below 32°F (0°C) Increase ambient temperature
Gun nozzles exposed to draft Prevent draft
Rated gun temperature too low
Set gun temperature to appropriate
Section 4
level
Nozzle distance from substrate too
Set distance to 0.50 in. (13 mm)
lame
Excessive hot Nozzle distance from substrate too
Set distance to 0.50 in. (13 mm) Section 4
melt material al:
large
beginning of
bead
Partially clogged nozzle
Clean nozzle Section 5
Insufficient air pressure to gun
Increase air pressure
Pump hydraulic pressure too high
Lower hydraulic pressure as required Section 4
Nozzle too large, resulting in
Use proper nozzle size
.
excessive instantaneous delivery rate
Excessive
Hydraulic pressure too low ’
Adhesive at
Increase hydraulic pressure as
Section 4
End of Bead
required
Adhesive too cold
Raise channel setpoints as required
Section 4
Insufficient air pressure to gun
Increase air pressure to gun as
Section 4
required
0 Nordson Corporation 1994
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P/N 106 701 A
41.23OOSP- 1194