Nordson 2304 - Page 85

Troubleshooting 6-27
13. Hot melt material
application problems
(continue@
Problem
Gelling of
Adhesive
Possible Reason Corrective Action
Refer to
System not properly flushed before
Attempt to pump remaining adhesive
changing to an incompatible adhesive from system, then properly flush
system; refill with fresh adhesive
Type R solvent used to flush a
system which was operating with
Polyamide, Surlyn, Polyester or
certain other high performance hot
melt materials
Attempt to pump remaining adhesive
from system, then properly flush
system. See Section 9 of this manual
on Type R solvent for
recommendations on choosing a
compatible solvent
Adhesive heated for too long
Do not heat adhesive longer than
recommended pot life of adhesive.
Use system STANDBY mode during
prolonged hold situations
Adhesive
Charring in
System
Adhesive heated at too high a
temperature
Temperature setpoints too high
Zone overheats
Reduce temperature or consult with
adhesive manufacturer about
recommended adhesive temperature
ranqe
Lower setpoints as required Section 4
Complete troubleshooting procedure
for overheating channel as required
Adhesive level kept too low
Keep tank at least one-half full of
adhesive
Adhesive oxidizing in tank
Keep tank lid closed during operation.
If problem persists, change the
adhesive or switch to an applicator
with a nitrogen blanket
.
Adhesive
Fuming or
Smoking
System maintained at operating
temperature with no delivery
Temperature setpoints too high
Use of unstable adhesive
Reduce channel temperatures during
prolonqed hold situations
Lower setpoints as required
Section 4
Change adhesives ’
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