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Paint booths with water curtain and dry filtration

Paint waste collections

Spray booths with water curtain

Design spray booths with water curtain Made from high quality galvanized sheets, bent under pressure. The chamber is equipped with a folding curtain, which facilitates its maintenance, and cassettes with filters "Paint-Stop" type, immersed in water circulation pump made of stainless steel, intrinsically safe fan And explosion-proof lamps IP 66 . The speed of air movement in the painting area is 0.4–0.5 m/sec.

Equipment: CVA - with a short wheelbase and CVA/G - with an extended base, water floor and grille.

At your request, our specialists will prepare a project overpressure chambers (“clean” room) based on those offered, and will also prepare you an offer for the supply painting complexes based on low pressure systemsHVLP applying paintwork ( compressors , paint sprayers , incl. HVLP , distillers etc.).

We recommend that you familiarize yourself with some theses on organizing the work of paint shops at the base spray booths with water curtain in winter and autumn-spring periods.

We also offer to your attention device for purifying water from paint waste V spray booths with water curtain(Collection of waste paints and varnishes).

In addition to supplying Italian spray booths, we also produce our own, respectively domestic production. The main advantages are low price and fast turnaround time (only 15 days)! Attention! New! Restored to new condition paint lines used from Veneta Revisioni (Italy)!

Paint booths with dry filtration

The structure is made from sandwich panels . The walls of sandwich panels are made of powder-painted galvanized sheets 30 mm thick, the space between which is filled with foam polyurethane foam.

Filtration polluted air is carried out using a set of fiberglass (floor) and labyrinth (in chambers without carbon elements) filters "Paint-Stop" type, 50 mm thick, installed frontally. In order to reduce dust concentrations in painting area And storage and drying areas we recommend using

Organizations that paint cars often use cameras with a water curtain. They represent one of the most advanced options, allowing you to create a coating for large-sized products, such as car bodies, their parts, furniture, etc. Their design as a whole is a stainless steel room with supply and exhaust ventilation, which operates on electric motors. The main working part is the heating element, which heats the box to the required temperature and maintains the heat level during work. Lighting also plays an important role, because it should create an even, intense light space without shadows.

Painting booths

What is the difference between painting chambers with a water curtain, and what is their advantage over traditional devices? Under specially created conditions, a mist of paint is formed, which then settles on the surface. But if in conventional options there is a danger that toxic substances or the vapors still leave the room, then in such devices they are retained with the help of water. In addition, the liquid binds volatile essential substances that are present in such a chamber. Of course, this type of filtration is not yet a guarantee of final disposal of harmful emissions, but still a significant decrease in their number.

Outdoor spray booths

There are also painting booths that operate in a closed air flow cycle; in this case, the air moves in a circle and is returned for reuse. And if it is not very well cleaned before starting a new process, then small droplets of dye will enter the room, which will polymerize. This can deteriorate the properties of the enamel, however, the curtain of water traps these residues.

Painting booths with a water curtain: stages of operation

As already stated, this type cameras is similar to traditional devices. Air comes from the atmosphere into limited space, while the suction is based on the operation of the fan. The air flow passes through many filters, and each of them performs a specific purification process. The quality of processing depends on the size of the holes in the filter material.

When the dyeing process begins, the air is heated using special heat elements. The temperature in the chamber increases. There are exit holes at the bottom of the device. They may be in different places. Through them the air flow leaves workspace which is done using fans. A water curtain is placed directly in front of the line, which removes the exhaust atmosphere from the chamber. Thus, before leaving the box, the air crosses a thin wall of water that traps dense particles - they settle as a suspension.

Actually, this design is a water filter. There are other possibilities when the air for cleaning is passed not through a wall of jets, but through a special container in which water is poured. In this case, dense particles accumulate at the bottom, which then form condensation. To ensure that all harmful substances precipitate faster, a reagent is added to such a container, which speeds up the processing processes.

The most advanced painting booths of this type have several levels of cleaning. The first of them is the passage of air through a continuous curtain of water. In this case, a wall of water is created, and its speed of movement is always uniform. The second level provides better cleaning air masses from dye particles (internal cleaning). This is where complete liberation from impurities occurs. The third level is the completion of purification processes, which can be achieved through carbon-based filters or another type of dry-based filtration. At this stage, all paint particles disappear. Consequently, the fan will be protected from dye residues.

These are the main stages of operation of such cameras. This system Air purification in painting booths with a water curtain helps reduce toxicity to a minimum, and therefore the use of this type of equipment is considered mandatory in those areas of industry where the use of liquid paints and varnishes is required.

Let's figure out what types of chambers there are for painting furniture parts. Depending on how many and what sizes the parts will be painted, what paint and varnish materials you will use, the required one is selected spray booth.

2.

water spray booth without side walls and floor (front curtain only)
water spray booth with active water floor
water spray booth without floor with side walls
water spray booth with active water floor and side walls
water spray booth with active water floor and active water walls
small painting booths, otherwise small-sized or laboratory ones for painting small products in piece production, instrument making, 1 and 2 meters long.

Spray booth with dry filters

Due to its design, when painting in a dry spray booth, excess paint mist and contaminated air are removed from the paint application area, while cleaning it. All this works with the correct selection of the fan.

What happens when using a spray booth with dry filters?

When operating a dry spray booth, the following processes occur:

removing paint particles and dust from the spray area
removal of paint aerosol, while preventing its spread into adjacent rooms
conditions are provided for obtaining paint and varnish coating high quality
the air that is removed from the painting area is cleared of mechanical paint particles that remain in the filters and released into the atmosphere.

How is air filtered in a dry spray booth?

The air flow, which is contaminated with paint and varnish products, with the help of a fan moves by inertia into the opening of the chamber where it is installed one or two filters.

What types of filters are there for a dry spray booth?

Filters for dry spray booths are:

Cardboard filter

The principle of operation of a cardboard filter is as follows: particles of paint and varnish hit the inner wall of the filter several times and settle there, and the air continues to move by inertia, with no loss of air speed during suction.

An example of calculating the filtering capacity of a dry filter

For example, you have a dry spray booth 2 meters long with a suction area of 3.6 sq.m. This area corresponds to two pieces of cardboard filter 0.9 meters high and 2 meters wide.

The filter holds about 15 kg of paint per 1 sq.m. It turns out that the filter of our spray booth will hold 54 kg of waste paint. To calculate, we simply multiply the holding capacity of the filter by its area: 15 kg/sq.m.*3.6 sq.m. = 54 kg.

Glass fiber filter

The fiberglass filter is made of fluffy interwoven glass fiber that is impregnated with a special compound. The filter retains paint mist particles.

The fiberglass filter can be used as the only or second level of air purification from paint mist.

In the version of the second level of filtration, this filter is installed behind the cardboard filter. Often, a fiberglass filter in a roll is installed on the floor of car cells, hence its second name – “floor”.

The service life of such filters is short, only 60 hours of coloring.

How long does a dry spray booth filter last?

This question, undoubtedly, in addition to the technological part, also has an economic component.

The basis for calculating the “lifetime” of a dry filter is the following components:

how many kilograms paint and varnish materials You spray per day
what kind of paint guns do you use, that is, what losses of paint materials occur due to fogging?
what products are painted
how they monitor the cleaning of spray booths and replacement of filters.

Example of calculating the lifetime of a dry filter

For example, you again have a 2-meter dry painting booth, paint consumption per shift is 20 liters per day (excluding solvent), you use a paint sprayer with a traditional spray system, the material transfer coefficient is 40-45%, that is, 8 liters out of 20 liters of paint flies into the fog.

Ours showed that it can hold up to 54 kg of paint. It turns out that one filter replacement will last 54/8 = 6.8 days, that is, about a week of work. And if you bought a roll of filter, then it will last for a month, you can figure out how much money it will be for yourself.

Spray booth with water curtain

A spray booth with a water curtain ensures maximum cleanliness and dust removal in the painting area. All this allows you to create ideal conditions for obtaining a high-quality glossy paint finish.

Frontal water curtain captures paint mist, and the air flow created by the fan additionally draws in contaminated air.


Video. 2. Spray booth with water curtain

What happens when a spray booth operates with a water curtain?

When operating a water spray booth, the following processes occur:

removing paint particles and dust from the spray area
removal of paint aerosol and eliminating the possibility of its spread to surrounding areas
providing ideal conditions for creating high quality coatings
the removed air is cleaned of mechanical particles of paint and part of aerosol vapors and released into the atmosphere.

How to care for a spray booth with a water curtain?

The first thing to do when operating a chamber with a water curtain is replacing the water. They change it depending on the degree of contamination in the cabin.

How quickly the chamber gets dirty depends both on the intensity of painting, that is, how many paints and varnishes are applied per shift, and on the paint guns used. In spray guns with a low material transfer coefficient, a lot of paint is spent on fogging, which means more paint settles in the cabin. If the water is dirty, it will be less able to capture paint mist and dust.

How do you clean water from paint in a spray booth with a water curtain?

In small factories, water is simply poured into the sewer, which is basically impossible, and the accumulated paint at the bottom is scooped out with shovels and other available means.

“Advanced” companies use coagulants and a collection of paint waste to remove paint. The addition of a coagulant allows the paint to turn into flocs, which precipitate or float to the surface as flakes. Flakes are removed manually or using a waste collector.

How is air purified in a spray booth with a water curtain?

Water spray booths have three levels of air purification from paint:

On the first level air purification performed using a frontal water curtain. A stream of water flows down this part of the chamber in a continuous and continuous stream.
At the second level, internal air purification occurs; here the main filtration and purification of the air from paint waste takes place. Depending on the design of the spray booth and the manufacturer, there are various internal air purification systems.
At the third level, dry filtration is carried out - the air is cleaned of remaining paint particles and protects the fan blades from paint sticking.

Water chamber design diagrams

Different manufacturers of spray booths have different filtration systems; for example, here are several diagrams of water spray booths.

What length and width should I choose for a spray booth?

If maximum length the parts to be painted are 2.7 meters, then the required length of the cabin is 3 meters, and if it is 1.8 meters, then 2 meters are needed.

If you want two painters to work in the booth, then multiply the numbers by two, at least.

The depth of the cabin depends on the size of the room in which the painting will be carried out. If the painter will be inside the cabin, then focus on maximum dimensions painted parts.

If the room is, for example, 4 meters, and the cabin is 3 meters, then the cabin can be installed without side walls. Again, if two cabins are installed side by side, then side walls are required so that there is no dust from the adjacent chamber.

Example of a paint booth from furniture production

Here are photos of a paint booth that were taken during a tour at a real operating enterprise.

Basic equipment:

Prefabricated body and settling tank made of galvanized steel with a large number of longitudinal, transverse and vertical stiffeners.

Double cascade of water curtains

The front curtains of both cascades (those through which water flows) have a quick-release design. This not only provides full access to the inside of the chamber for maintenance, but also makes it technically possible to narrow the gap between the bottom edge

curtains and water in the bathroom below. For the upper cascade, this is the bath of the lower cascade, and for the lower cascade, this is the settling bath.

This design has a number of advantages, the main ones being:

due to the absence of long sections of free fall of water, the formation of splashes in both the upper and lower parts is eliminated working area;
water rushing off the lower edge of the water curtain creates a dense flow that additionally cleanses the air of suspended particles, which eliminates the need to install water sprinklers;
air flow rate after entry painting booth is reduced by 4-5 times, which allows suspensions to settle into the settling bath, increasing the degree of purification of the emitted air.
The location of the bath for placing the pump is universal (to the left or to the right of the chamber). In this way, the service side can be selected during installation.
The location of the service area outside the chamber allows for visual control of operation and avoids external contamination of the pump, which leads to its overheating and premature failure.
Valves located outside make it easy to regulate the water flow in the water curtains, as well as to quickly drain water from the chamber using a standard pump during its scheduled maintenance.
Stainless steel pump,pumps clots of coating sludge with a diameter of up to 35 mm, as well as a built-in overheating protection system.
A system of circulation water lines, including a water circulation valve, an automatic water drain valve, all the necessary hoses, passage units, flanges, clamps and others installation materials
Mounting kit including bolts, nuts, washers, sealant, etc. according to camera configuration
Packaging for transportation by road
Passport and instruction manual
CD with diagram and photo illustrations of the assembly

Additional options:

Exhaust fan
Labyrinth of barrier panels
Control panel for placement outside the hazardous area
Control panel in a plastic case
Explosion-proof luminaires with lamps (2x36 W)
Increasing the depth of the working area by 0.5 meters (roof panel and 2 side panels)

Water floor
Supply fan and set of filters for an “economy project”
Placing the pump inside the chamber (to reduce the overall width of the chamber)
The front curtains of both cascades are made of stainless steel instead of galvanized steel