Equipment

How does the principle of airless spraying work?

Coating material is split up under high hydraulic pressure (up to 500 bar) and is superseded through an elliptic aperture of a special tip. Thus the potential energy of the coating material transforms to kinetic when the stream exits in atmosphere, there are turbulences, leading to a pulsation of a stream, fluctuations and deformation of the stream surface. The deformations amplify because of hydrodynamic influence of the air, and it leads to formation of the aerosol cloud, with the wide range of drop sizes within. With this kinetic energy the drops of coating material move to the surface, which is being coated, and, overcoming the resistance of air, are braked and softly lay on a surface. The smallest drops lose speed, and fall out of a painting flare, settling on the floor and surrounding objects. The size of the drops depends on pressure, the geometrical sizes and form of the tip, and physical characteristics of the coating material. Basing on motive power of the airless spraying the devices could be classified as follows:
- Electric units with diaphragm pump
- Diaphragm pumps with internal combustion engine
- Electric piston pumps with mechanical transfer

What are the advantages of airless spraying?

20% less fog formation losses than at pneumatic dispersion
Less pollution of the painting chambers, than with pneumatic dispersion
The average drop size is bigger, drops move and hit the surface faster. Compared to pneumatic dispersion more coating material arrives to the surface at the same time period, i.e. the productivity increases sufficiently (especially when large areas are covered)
Drawing of one thick layer is possible
High-viscosity materials can be sprayed
The painting flare has strictly outlined borders, defined by the characteristics of the tip, that provides more control over the painting process
The compressor is not necessary

What is the difference between electric, internal combustion and pneumatic drives?

Advantages of the electric drive are its efficiency, and ease of use (can be used everywhere, where there is a socket)/ it does not demand additional expenses for the compressor. It is powerful enough to work with materials of high viscosity.
The internal combustion (petrol) drive allows to work field conditions, without additional power supply; maximum power of the electric drive is 2.2 kWt, while internal combustion drive ranges from 3 to 16 kWt, which allows longer hoses and a few posts.
The pneumoengine provides up to 500 bar pressure, that allows to work with heavy materials, of high and very high viscosity. Ideally suites the enterprises with a compressed air pipelines.

What is the difference between the devices of the same product line?

Devices of the same product line differ from each other with productivity, drive power, maximum tip size and hose lenth (and weight as well).

Can the devices be used for applying plaster, putty or mastic?

There are special devised for these materials (Graco - T-Max Series; Wagner - PlastCoat series)

What is the fog formation factor for airless spraying?

Airless spraying has 40% fog formation, which is 20% less than for pneumatic dispersion.

Where do I pour the paint?

It is not necessary to pour the paint anywhere, just put the intaking hose into a bucket.

How the tip size depends on the pressure?

The bigger tip diameter requires the higher pressure.

How I can select the tip and the pressure for the particular material?

This information usually can be found in the material Datasheet, but you can refer to a table . (link below).

How the devices of various manufactureres differ?

Each manufacturer can equip the devices with additional functions, like smart-system, self-cleaning option, idle protection gauge, etc.

Why do similar devices from various manufacturers differ in prices?

Not all devices are equipped with smart-system, however this electronic block considerably simplifies the work (it automatically detects the viscosity of the material and tip size, and levels the pressure fluctuations). It allows to spray the meterials of high viscosity. The main function of smart system is electronic control over the engine revs when the material is sprayed, as it protects the engine from being burned (engine cost is approximately 50% of the whole device cost). Also smart-system performs auxiliary functions: account of material expense, device operating time, autodiagnostics, etc.
The self-cleaning function prolongs the service life of the filters, saves working time and simplifies operation.
Idle protection gauge turns off the device at incisive pressure decrese in system, does not allow the pump to work dry and prevents the deteriaration of the seals.

What factors influence speed of work on coating applications by a method of airless spraying?

1. The form of the object
Time necessary for colouring of constructions, consisting of spatial elements, will be more than for colouring of products with prevalence of flat surfaces. Before pressing the starting clamp of a gun painter should present a trajectory of movement of the tool relative to a surface, find out the zones of recolouring and correct the speed modes colouring, depending on the geometry of a painted surface. Time for making decisions on such problemsmay vary from part of the second to several seconds, depending on the qualification of the painter, but these insignificant time ranges multiplied by thousand of strat/stop operations can give considerable braking effect.
2. Weather conditions at the moment of colouring
When working in the closed locations weather influence is brought to naught. In case of working in the open air wind influence can essentially lower the speed of painting, because the operator should apply the coating in intervals between wind impulses, or according to the wind rose, focusing the painting axis not perpendicularly the painted surface, but under a certain degree, to minimize the influence of the wind (usually coloring is made downwind, the axis of a painting torch is dispalces from a perpendicular on a wind). In both cases the speed of painting works is reduced essentially.
3. Qualification of painter
How much well the painter owns professional receptions at use of a method of airless spraying, influence of the described factors on speed indicators of all process of colouring will be so effectively localised or minimised.

Whether it is possible to use airles spraying method to paint a product of the unusual shape?

If ailess spraying is used separate parts of the unusual-shaped objects remain inpainted.
The best choice would be electrostatic method, when the object is completely enveloped by a meterial (see picture). (electrostatic method can only be used for metal objects).

The universal method is HVLP, which is can be used to objects of any materials. With this method fog foramtion makes the coating material settle on internal surfaces of the difficult-shaped object.

When using the method of aireless spraying to varnish with polyurethane lacquer the boards (undercoated with polyurethane primer), strips of different width appear after drying, following the painter hand movements.Tip replacement does not help it. What is the reason?

The matter is that airless spraying method is not suitable for finishing appications. After all, the main davantage of airless spraying is it's main disadvantage - minimized overcoating makes the paitning torch borders more outlined, thus casing such strips. Combined spraying method should be chosen for finishing applications.

What is the technics of technics of uniform drawing of nacre on a wall?

Nacre imitation is one of the most beautiful and popular special effects. However, as it often happens in a life, the beauty demands victims. The effect of nacre demands the special technics of drawing. Your task is to apply the product to the surface as much regularly as possible. The less suitng instruments for that purpose are such habitual tools as a brush or a platen. As though you tried, you cannot achieve perfection with these instruments.
The most ideal device for drawing of nacre is pneumatic spraying gun. But this method has an essential lack - the overblowing - which sufficiently complicates the work of paiter when doing that indoors, settling the material on the floor, on the ceiling and everywhere around. Therefore, using a method of pneumatic spraying, it is necessary to "mask" with paper or with polyethilene film all surfaces that are not subject to painting. As a rule, this condition is impracticable because of the highest labour input. However there is a tool which allows to put nacre in regular intervals and not delivering so much difficulties as pneumodispersion. It is the special platen with automatic material delivery. By means of the pump, on a flexible hose, through the handle the paint and varnish material is pressed through platen "skin" directly, and allows to increase sharply the productivity of painting works and to achieve the maximum uniformity of drawing of a paint, including nacreous varnish.

What scope of use for HVLP professional painting equipment?

HVLP equipment is applied both in general conditions for small volumes of painting, and in the industry: in joiner's, furniture, autorepair workshops, for colouring of the hardware, the forged details, at internal and external furnish, for drawing of glues in upholstered furniture manufacture and so forth.

Are any additioan skills required to work with HVLP equipment?

To work with the HVLP-painting equipment no special additional skill needed. If you do not have experience of application of the mechanised way of colouring - you can pass courses in the Educational centre of our company. Thus, as well as any other equipment, HVLP painting devices are to be maintained and served according to manufacturer's recomendations and instructions. In the absence of trained employees among the staff of your company, we are always ready to help you with our service center.

How to clean the device?

The liquid for device cleaning is specified by the paint manufacturer in the manual (application instructions).

What is the maximum hose length?

The length of hoses depends on capacity and productivity of the device, tip diameter and the material viscosity.

What should I do if the device has broken?

If something happens with the equipment, do not try to make any repqirs by yourself, just call our round-the-cock tech support at +7 922 134 50 00 or bring the device to our service center in Ekaterinburg, Alpinistov St., 57

What is the difference between the tips of different manufacturers?

They do not fit the gun of the other manufacturers.