VALCO MELTON D-90, Руководство пользователя

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8-3 Valco Cincinnati, Inc.
Section 8 - Troubleshooting and Repair MM125 - D-90 Hot Melt Unit
Problem Possible Cause Possible Solution
Cold adhesive on product
after dispensing
Adhesive temperature is too
low
Raise the Castings, manifold, hoses and
applicators temperatures in accordance with
adhesive manufacturer’s specifications.
Nozzles are too far from gluing
surface Move the applicator closer to the gluing
surface.
Too much adhesive output at
the start and end of the bead
Adhesive pressure is too low
Adjust the pressure by increasing the
pressure relief valve.
Applicator is partially clogged Clean the applicator nozzles.
Nozzles are too far from gluing
surface Move the applicator closer to the gluing
surface.
Nozzle outlet is too large Change to a smaller nozzle size
Bead breaks during
dispersion
Adhesive viscosity is too high
-Castings and manifold
temperature too low
Raise Castings and manifold temperatures in
accordance with adhesive manufacturer’s
specifications.
-Wrong adhesive
See adhesive manufacturer’s
recommendations.
Adhesive temperature is too
low
Raise the Castings, manifold, hoses and
applicators temperatures in accordance with
adhesive manufacturer’s specifications.
Adhesive is old Change adhesive
Bead with fine threads
Adhesive temperature is too
low
Raise the Castings, manifold, hoses and
applicators temperatures in accordance with
adhesive manufacturer’s specifications.
Adhesive is old Change adhesive
Nozzles are too far from gluing
surface Move the applicator closer to the gluing
surface.
Adhesive viscosity is too high
-Castings and manifold
temperature too low
Raise Castings and manifold temperatures in
accordance with adhesive manufacturer’s
specifications.
-Wrong adhesive
See adhesive manufacturer’s
recommendations.
Frequent nozzle obstruction
Adhesive is charring
Raise the Castings, manifold, hoses and
applicators temperatures in accordance with
adhesive manufacturer’s specifications or
change adhesive type.
Pre-existing obstructions Clean and flush system.
Applicator filters are dirty Clean/replace the filters.
Troubleshooting - Continued