UES perfectMelt - Mechanical Malfunctions; Problems with Glue Application

UES AG · Breuershofstr. 48 · 47807 Krefeld · Germany
Tel.: 0049-2151-72950 · Fax: 0049-2151-729578 · info@ues-ag.net · www.ues-ag.net
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Mechanical malfunctions
Problem
Possible causes
The pump does not work
• Tank temperature is too low.
• The module is clogged.
• The filter is clogged.
• The reed contact on the pump switch is defective
The pump is very fast
• Too little glue in the tank.
• Connections are not sealed.
• Ball seats in the pump are clogged => Remove the pump and
clean the valve seats; they might be coking there (carbon
storage), which prevents proper sealing.
The application head is
not applying any glue,
although the valve is
activated
• Nozzles are clogged (clean).
• Application head is not at the right temperature.
• The pump does not work.
Problems with the glue application
Problem
Possible causes
Recommended solutions
Glue bead is
wavy or broken
Temperature is too low
Raise the temperature
The pump pressure is too high
Raise the pump pressure
The glue is too old
Let out and renew the glue
Draft at application head
and / or low ambient
temperature
Cover application head with
protective screen, slightly
increase the temperature of the
adhesive
Nozzle is clogged
Replace or clear the nozzle
Nozzle is too large
Screw on a smaller nozzle
Amount of glue is too high
or the adhesive is receding
from the substrate
Pump pressure too
high Adhesive too
hot
Reduce the pump
pressure, reduce the
temperatures
The glue is forming bubbles
Temperature is too high
Reduce the temperature
The tank is empty
Refill glue
Moisture in the glue or on
the cardboard
Glue is dripping from the
application head
Needle and / or seat worn
or dirty
Clean the dirty parts and /
or replace the worn parts
Insufficient spring pre-
load
Turn the Allen screw on the
module to increase the
spring tension
Nozzle clogs frequently
Glue crusting in the system
(due to overly-high
temperature, prolonged
downtime or soiled glue
reservoir)
Clean the system, change the
in-line filter and check the tank
filter, change or clean the
nozzle, check the cause! (e.g.
temperature too high in the
tank)