Polyurethane foam spray equipment

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 quality.

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 vapors.

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 room.

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 to 6L/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 feed systems.

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.

The Spray Gun is used for homogeneous mixing and compressed-air spraying of polyurethane components to various surfaces.

Experience 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.

Polyurethane foam spray equipment. Sprayer Operation Procedure (see more details in the Specification)

Starting Up:

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 B.
4. Start the unit motor using the toggle switch located on the hose bundle connected to the Spray Gun.
5. Do the spraying.

Shutting Down:

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.