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Batch Tanks - for Heating,
Agitating and Vacuum Degassing
These tanks are used for heating and degassing
"batches" of resin for
automatic machine processing or hand-mixing. Quantities prepared
this way can vary from a few pounds to hundreds of pounds. Larger
quantities are continuously heated and degassed on-the-fly.
Batch Tank - Benefits:
- Peace-of-mind, you know the entire batch is ready
before you pour.
- Provides high-quality, air-bubble and void-free
resin materials.
- Maintains materials at precise preset temperature
(+/- 1oF) to 285oF.
- Available in 2, 5, 10, 15, 30, 60, 75 and 100-gallon
tank sizes with
many standard options to match your specific process requirements.
- Independent temperature controls let you connect
various sizes and
types of portable APT tanks to your process equipment.
- Rugged construction offers dependable operation.
Description/Operation:
- You can manually pour a batch of resin into the
tank's fillport or draw it in via vacuum (i.e., the same vacuum you use for degassing)
with an optional Resin Vacuum Transfer System.
- Once the material is raised to the required elevated
temperature and viscosity is lowered, vacuum breaks the air-bubbles and dissolved
gasses. This can result
in a violent bubbling action, which settles-down as most of the air is removed.
- The agitator's pumping motion continues to bring
fresh material to the resin's surface for outgassing -- up on the sidewall and down along
the agitator shaft, which also helps to maintain homogenous temperature control throughout
the batch.
- Once fully heated and outgassed, the material can be
fed to your hand-casting station or to downstream automatic equipment. Gravity or dry nitrogen gas
over-pressure (used to eliminate moisture contamination) can be used to drive material out
of the tank. When constant vacuum is maintained on the material or when material
recirculation (from the tank,to the metering pump, to the mixer and back to the tank) is
required, internal or external feed pumps can be used to
provide necessary positive output pressure to the machine.
- These Tanks are available without heat and
special APT tanks, with high- temperature control to 500oF, are available.
Material Temperature and Vacuum Levels:
Resins typically require heating and agitation to
significantly lower the resin's viscosity and surface-tension -- to remove all the air and
dissolved gasses -- prior to metering, mixing and dispensing into molds. Some
materials are easily outgassed without heat, however, consistent degassing with materials
having a viscosity of 1,000 cps or higher often relies on precise (±1oF)
temperature control of the materials. The rule is that consistent outgassing demands
controlled temperatures and accurate vacuum levels.
To eliminate air-bubbles, no matter how air-free the materials might look coming out of
the supply drums, vacuum must be drawn on the materials. The entire range of vacuum
levels typically used to remove air from resin materials ranges from 5 millimeters vacuum
to 0.05 millimeters (50 microns) from perfect vacuum. Degassing at levels between 5.0 mmHg and 2.0 mmHg
makes low to medium viscosity urethane and epoxy resins visibly "air-free". If you pot or encapsulate high
voltage electrical or electronic components, 1.0 mmHg vacuum or less will be required.
You'll need to pour those parts inside a vacuum chamber. APT manufactures a
wide variety of Vacuum Potting Systems, including mixing machines and vacuum chambers.
If your materials include volatile components that will gas-off quickly or they
just need need some slight vacuum (for example, 25 to 29 inches of mercury) to remove
gross air, we offer timed vacuum sequences in place of constant vacuum.
Vacuum Levels Required for Degassing Resins:
30" Vacuum = 0.0 mmHg (Torr) = 0.0 microns = Perfect
Vacuum
0.05 mmHg (Torr) = 50 microns
0.1 mmHg (Torr) = 100 microns
0.5 mmHg (Torr) = 500 microns (Resin is degassed at 50 to 500 microns to
vacuum
pot and encapsulate high voltage components.)
1.0 mmHg (Torr) = 1,000 microns (In-chamber vacuum levels from 500 to 1,000
microns are required for most vacuum potting and encapsulating applications.)
2.0 mmHg (Torr) = 2,000 microns
5.0 mmHg (Torr) = 5,000 microns (2 to 5 mmHg is needed to make low to medium
viscosity resins, including cast urethanes and epoxies, visibly air-free. This range
of vacuum levels is five to ten times better than 29" of vacuum.)
10.0 mmHg (Torr) = 10,000 microns (Very little degassing is done at this level.)
29" Vacuum = 25.4 mmHg (Torr) = 25,400 microns (Not a sufficient
vacuum level for degassing most epoxy and urethane resins.)
28" Vacuum = 50.8 mmHg (Torr) = 50,800 microns
15" Vacuum = 381 mmHg (Torr) = 381,000 microns
0" Vacuum = 762 mmHg (Torr) = 762,000 microns = Ambient Air
Batch Degassing Tank - 10 Gallon.pdf
Batch Degassing Tank - Options.pdf
Batch Degassing Tank - Specifications.pdf
Top of This Page
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 gauge
on the tank lid, plus plumbing to the tank. An optional electronic
vacuum sensor, mounted on the tank lid with an automatic control
valve, can hold preset vacuum setpoints on material in the tank.
Presets can be entered at an operator-interface panel. |
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The
Heateroll® - 55-Gallon Drum Rolling/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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