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Problem
2.
Wavy beads
3.
Excessive adhesive at
beginning of bead
4.
Adhesive stringing
5.
Concentric circles in bead
6.
Adhesive bouncing or
splashing from product
E 2000 Nordson Corporation
All rights reserved
Possible Cause
Adhesive too cold
Ambient temperature below freezing
or guns subject to draft
Nozzles too far from product
Nozzles too far from product
Nozzles partially clogged
Nozzle too far from product
Adhesive too viscous
Adhesive too cold
Adhesive old
Adhesive too hot
Adhesive not viscous enough
Adhesive too hot
Adhesive not viscous enough
Nozzle orifice too large for
application
Too much hydraulic pressure
41-3000
Issued 11/00
Pump
Corrective Action
Check the tank, hose, or gun
temperature setpoints and adjust
them as necessary.
Protect the melter and guns from
freezing temperature conditions and
drafts.
Position the guns so the nozzles are
no more than 13 mm (0.5 in.) from
the product.
Position the guns so the nozzles are
no more than 13 mm (0.5 in.) from
the product.
Clean the nozzles. Refer to the
nozzle cleaning procedure in the gun
manual.
Position the guns so the nozzles are
no more than 13 mm (0.5 in.) from
the product.
Change to a compatible
lower-viscosity adhesive.
Check the tank, hose, or gun
operating temperature setpoints and
adjust them as necessary.
Do not exceed the recommended pot
life of the adhesive.
Check the tank, hose, or gun
operating temperature setpoints and
adjust them as necessary.
Change to a compatible
higher-viscosity adhesive.
Check the tank, hose, or gun
operating temperature setpoints and
adjust them as necessary.
Change to a compatible
higher-viscosity adhesive.
Change to a nozzle with a smaller
orifice.
Decrease hydraulic pressure.
Continued on next page
B2EN-02-[3-PUMP]-5
B 2-3
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