User's Manual

Theory of Operation
3A0232R 15
Theory of Operation
External Mix
The resin or gelcoat stream and the catalyst stream
impinge when they exit the spray tip. The catalyst is
atomized with air pressure by the AAC air to achieve
high mix quality. External mixing reduces internal clogs
from cured material.
Internal Mix
The material and catalyst pass through an internal static
mixer where they mix. The mixed solution is dispensed.
Chop Guns
Fiberglass is pulled through cutter and cut into small
strands. The cut strands are then dispensed into the
mixed material stream.
Impingement versus Airless
Spray Tips
Impingement spray tips are typically for chop guns. This
utilizes multiple impinging streams to create the fan pat-
tern.
Airless spray tips are typically for gel guns. This utilizes
a single cat-eye shaped orifice to create the fan pattern.
Air Assist Containment
™
(AAC
™
)
When material exits the spray tip, air is sprayed against
the material stream to shape it into a more consistent
pattern.
Grounding
Introduction
To have the optimal RS gun experience, the most impor-
tant procedures to understand and perform as specified
are:
• Startup on page 18
• Adjust Trigger Clamp on page 29
• Adjust Anvil to Blade Cartridge Tension. Refer to
RS Gun Cutter Assemblies Operation-Repair man-
ual for details.
• Daily Shutdown on page 21
This equipment must be grounded.
Grounding reduces the risk of static shock by providing
an escape wire for electrical current due to static build
up or in the event of short circuit.
NOTE: Grounding wire and clamp assembly 17440-00
is included with Graco FRP proportioner. If using a dif-
ferent proportioner that does not come with a ground-
ing wire and clamp assembly, order 17440-00 or
provide your own.
Ground the dispense gun through connection to a
Graco approved grounded fluid supply hose.
Check your local electrical code and related manuals
for detailed grounding instructions of all equipment in
the work area.
NOTICE
Failure to perform these procedures correctly and
according to the prescribed schedule can result in
poor mixing, fluid leaking, cured material in the gun,
and premature component wear.