Polyurethane foam spray equipment
|Polyurethane foam spray equipment -
PENA 98-type units
PENA 98-type units are designed as open
architecture machines, which provides an easy access to each assembly
and module of the unit. The design of PENA 98-type machines is a
successful combination of reliability, easy operation, and excellent
A major structural advantage is that the
feed tanks are not mounted on the unit. This design provides a good
portability, a low weight, and small dimensions of the machinery,
which is convenient in transportation and easily fits into doorways
and elevators. This equipment can be used both in field or construction
site conditions and in stationary facilities.
This pattern (without permanent tanks)
was first used in East German low pressure units in the mid-1980s.
The open architecture and the absence of permanent tanks facilitate
the unit maintenance, allowing our customer to easily examine and
troubleshoot all ducts and connections or, if necessary, to quickly
replace any ducts, pumps and gearbox gears or disassemble the motor.
Polyurethane foam spray equipment.
The open architecture concept use for PENA 98-type units
This implementation of the ‘no permanent
tanks’ concept provides a handy method of cleaning the tanks without
having to pour methylene chloride into them and run it through the
pumps, especially because such operation always requires final manual
cleaning, which can hardly be enjoyable among methylene chloride
In certain cases, however, Line B tanks
are just impossible to clean thoroughly or must be replaced for
process reasons. For instance, if the grade of a new feed is different
from the previous one or it has the same grade but is supplied by
a different manufacturer, it is advisable to USE NEW tanks and hoses.
Replacing permanent tanks, which are rigidly
fixed and have inlets and attachments for ducts and pumps, is obviously
a time consuming process, during which one sometimes has to cut
out the tanks. But when you have removed the tank and disassembled
the unit, it is not the end yet; the next equally challenging task
is to find and mount a replacement tank.
The tanks on a PENA 98-type unit can be
quickly replaced (just buying a new cheap 40 or 50 liter plastic
canister) or quite easily cleaned when necessary. An additional
design benefit is that the tanks can be arranged in any convenient
place near the unit, which may be critical in a confined narrow
For winter operation, dependable high-quality
heating of tanks is provided by a series of uncomplicated devices,
which are much more efficient than illusionary permanent tank heating
systems on other types of units.
The feedback we have received from many
consumers confirms that the adjustment, maintenance, checkout and
preservation of open-architecture machines may require higher operational
standards but are generally much simpler and handier than is the
case with equivalent machines that are made more complicated and
heavy-weight by permanently installed tanks. The keystones of PENA
98 units are mobility, reliability, simplicity and serviceability.
The unit’s duct system consists of two
2.5-meter long suction hoses with disposable end filters mounted
through ball plug valves. Such hose can be swung directly into a
tank from above; alternatively, you can make hole in a plastic container
and then fix the hose in such a manner that the filter is inside
and the valve is outside the tank. In this case, the tank will obtain
a “permanent” status, but it will still be easy to remove and replace.
10-meter long delivery hoses are supplied
within the standard kit and may be optionally lengthened to 30m.
The unit weighs 75 kg, and the weight of each full feed tank is
50 kg. Trundling a small-size 75 kg carriage and bringing two 50
kg canisters will take two people and three trips and will obviously
be much easier than trying to drag a huge platform that may be as
heavy as 230 or 250 kg.
The unit has a rated feeding rate of 2
liters using 21NSH-20 type pumps. This allows a low pump shaft speed
of 60 rotations per minute, which substantially extends the pump
service life and still provides a stable, minimum-error jet.
The output can be increased to 4L or lowered to 1L. Some of the
models are furnished with stepless output control from 0.5L/min
For a greater convenience and a higher
performance, the unit is designed for eleven component ratios and
so can be set to process any grades of both domestic and imported
The power of the unit’s motor is three
times its rating, so that even if the machine has to use a 220V
power supply (i.e. in case of power loss), the operator can be sure
that the gear motor shaft will rotate and the unit will work.
The on/off switch can be remotely controlled by the spray operator.
Every manufactured unit has to pass an in-plant acceptance inspection,
which includes several hours of production testing in a series of
simulated nonstandard conditions such as duct pressure increase,
temperature drop, change of line voltage, etc.
|Polyurethane foam spray equipment -
The Spray Gun is used for homogeneous mixing
and compressed-air spraying of polyurethane components to various
shows that using an RP-00.00 Sprayer model designed in 2001, you
can save up to 20% of raw materials. This is achieved due to a thoroughly
elaborated arrangement of component and air feeding nozzles in the
Spray Gun’s mixing chamber. In addition, the design of our equipment
ensures that the components are “air-supported”. In the process
of operation, pressurized air is delivered through the clearance
between the wall of the ball plug valve and the air duct opening
towards either of the components into the ball plug valve at the
Gun inlet and further accompanies both components separately until
they enter the mixing chamber.
In the mixing chamber,
the components are mixed evenly and the chemical reaction starts.
To ensure a high-quality reaction, the components mixing must be
homogeneous. This is achieved due to the high performance of our
equipment. When the RP-00.00 Gun is used, the entire volumes of
components A and B entering the mixing chamber are involved in the
reaction. The probability of any part of either component leaving
the Gun before it reacts is completely excluded.
A huge advantage of the mixer design is that
it uses standard angle-type ball plug valves and is therefore fully
repairable. The Sprayer is supplied with an SPTA kit comprising
replacement nozzles (size 3 and 4 mm), replacement O-rings, a spare
angle valve with a spare 4'6 fitting, and a replacement air supply
tube for the Sprayer.
||Angle-type, ball plug
|Components operating pressure
A new model of Spray Gun now is available.
Polyurethane foam spray equipment. Sprayer
Operation Procedure (see more details in the Specification)
1. Turn on the compressor and open the
Spray Gun air supply gate.
2. Remove plugs from the component hoses and fix the connections
to the Spray Gun.
3. Lower the Sprayer leverage to the horizontal position. This will
simultaneously open the two ball plug valves for components A and
4. Start the unit motor using the toggle switch located on the hose
bundle connected to the Spray Gun.
5. Do the spraying.
1. Stop the motor using the toggle switch
located on the hose bundle.
2. Lift the Sprayer leverage vertically thus closing both components’
ball plug valves simultaneously.
3. With the compressor air supply still on, slightly tighten the
mixing chamber air delivery valve. After this, the air will be evenly
redistributed through three ducts and will enter the mixing chamber
from four openings.
4. Continue the air-wash for at least 5 to 8 minutes.
5. Shut down the compressor.
To prevent choking of the Sprayer and
to facilitate the cleaning, it is advisable to apply a thin layer
of lubricate to all inner ducts of the Sprayer, the mixing chamber,
and all threaded joints before starting the work. The lubrication
will form a protective film on the surface of the ducts. After such
precaution, even if the Sprayer is choked and polyurethane starts
to foam inside it, it can be easily removed, since the lubricating
film will prevent its adhesion to the metal.