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Resin Transfer Molding (RTM) and
Vacuum-Assisted RTM (VARTM) Metering,
Mixing and Injection Systems
Dispense void-free, accurately metered, mixed and dispensed
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
Mixing Tanks and applying nitrogen overpressure to force the mix into the RTM mold.
But building repeatability and
consistency into your automated RTM production process
demands attention to critical process variables like ratio, temperatures to 500F,
pressures
and flowrates. Filling void-free preforms on a production basis requires you to
experiment,
to save the machine presets that provide high-quality parts and to easily set up
RTM molds
of different sizes and shapes and repeat the process.
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. If you
are
at the experimental stage or on a relatively tight budget, we'll offer alternative
lower-cost
RTM and VARTM systems that will help you get your project under control.
Any of our ECS, SRD, CDM and HT-Series
systems can be equipped to operate under the
umbrella of RTM/VARTM resin injection systems. We have also provided our customers
with
some unique solutions, including 500F process temperature and lower-cost continuous
metering systems made with more-affordable rotary gear pumps.
  
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.
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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