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Resin Transfer Molding (RTM) and
Vacuum-Assisted RTM (VARTM) Metering,
Mixing and Injection Systems
Dispense void-free, accurately metered and mixed
epoxies and
polyesters into RTM and VARTM molds for superior preform
penetration and void-free resin injected parts.
Injecting resin into RTM parts can be as simple as
mixing epoxy in one of our Batch
Degassing and Mixing Tanks,
applying vacuum to deair the mixed resin and then
applying
nitrogen overpressure to force the
air-free mixture into the RTM mold.
To achieve
repeatability and
consistency in your fully automated RTM
or VARTM production
process, APT has custom-designed its equipment to
instantaneously monitor and control
all of your critical process variables. These
variables, which you digitally enter at the operator-
interface touchscreen, include ratio, independent
material temperatures to 500F,
vacuum levels
in the heating and degassing tanks and inside the mold, plus inside-the-mold
mixed resin pressures
and mixed resin flowrates.
With this level of process control and automation, our customers fill
void-free vacuum-assisted preforms on a
production basis. They also easily select saved
part recipe
presets to dispense fill air-bubble-free resins into
RTM or VARTM molds of
many different sizes and shapes.
Where your budget allows, we can provide
you with state-of-the art resin injection systems with digital
PLC and PC control that operate in real-time with digital pressure sensors
and mass flowmeters -- to
track and verify mixed material penetration into preforms.
Our systems operate at very low PSIA injection
pressures for resin infusion and VARTM up to 400 to 600-PSI for true RTM.
If you
are at the experimental stage or on a
relatively tight budget, we can offer alternative
lower-cost RTM
and VARTM systems that will help you get your project under way.
Any of our ECS, SRD, CDM and HT-Series
metering, mixing and dispensing systems can be equipped to
operate under the umbrella of RTM
resin injection and VARTM resin infusion systems.
Our all-digital SRD and
ECS-Series systems provide state-of-the-art monitoring and control of these
processes.
 
Accessories:
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Light-Sensing Vacuum Traps
Eliminate costly vacuum pump rebuilding and cut downtime.
This liquid trap stops foamed resin from flooding the vacuum
pump while degassing. When the glass-tube receiver has just
30ccs of resin inside, the light-beam and reflector sense it, the
valve closes, an alarm sounds and the flood of resin stops.
The receiver (see inset) comes apart four pieces for easy
cleaning. |
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Vacuum Pumps
11-, 20-, 55-, 100-CFM and larger are available from APT.
Complete
assemblies include a motor-starter, a manual switch mounted on
the control panel, a bleed valve and an analog or digital readout,
plus plumbing to the tank. An optional electronic vacuum sensor,
mounted on the tank lid with an automatic vacuum valve, can hold
preset vacuum setpoints on material in the tank. Preset vacuum
levels can optionally be entered at the operator-interface control
panel on the meter/mix machine and held to microns of vacuum. |
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The Heateroll® - 55-Gallon Drum Heating/Melting Oven
Melts one drum, fast. The combined heating and
rotating action
of the The Heateroll® typically preheats drums 6 to 8 times faster
than conventional "stand-up" drum heating methods. Operates with
ceramic-enclosed infrared heaters. Saves energy and minimizes
thermal degradation of the material. Inset shows the Heated
Compartment, which slides over the drum, in the closed position.
Units are also available with 55-Gallon size drip pans to
collect all
of the drum's contents in the event that a drum received in damaged
condition leaks.
Temperature Range: 90oF to 200oF.
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Note:
Resins typically require precise (± 2°F) temperature-control, agitation and
vacuum degassing to significantly lower the resin's viscosity and surface-tension.
This removes all the air and dissolved gasses prior to metering, mixing and dispensing
into RTM molds, either inside vacuum chambers or under sealed vacuum bags. APT's Batch Tanks and Continuous
Thin Film Deaerators prepare the resin materials for void-free metering, mixing and
injection. Various levels of vacuum degassing (down to the micron level) are
required for different applications.
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