What is the diameter of the nozzle on the spray gun needed for painting a car
Content
Beginners can pick up a universal device with a 1,4 mm monolithic nozzle. It is suitable for applying a soil mixture diluted slightly above the norm, as well as for painting car elements with various paints and varnishes. But it should be borne in mind that the result of spraying may turn out to be of poor quality: overspending of paint due to fog or the appearance of smudges is possible.
For high-quality painting of a car, it is important to choose the right diameter of the spray gun nozzle. It is necessary to take into account the viscosity of the mixture with which the surface is painted. If the nozzle is incorrectly selected, this will lead to poor performance and damage to the unit.
The structure and principle of operation of a pneumatic spray gun for painting cars
The final stage in the production of a car, as well as its repair, is the application of a paintwork. It is impossible to imagine an auto repairman carrying out this work using a brush - such a process will be lengthy, and paint consumption will be enormous. Today, cars are painted using an airbrush - a special device that sprays paintwork material.
Outwardly, the paint sprayer resembles a pistol grip. It consists of the following main elements:
- handle - with its help the tool is held in the hand;
- tank for material;
- trigger - is responsible for starting the spraying process;
- painting nozzle (nozzle) - creates the direction of the jet for painting the car with an airbrush;
- pressure regulator - controls the flow of compressed air and changes its pressure.
Oxygen entering the spray gun through a special hose is blocked by a damper. After pressing the trigger, compressed air begins to move through the internal channels of the device. Since the oxygen supply is blocked, the air flow pushes paint particles out of the tank through the nozzle.
The appearance of the spray gun
To increase or decrease the spray rate, craftsmen change the size of the nozzle while working with the spray gun. The principle of operation of the device can be compared with a household spray gun, however, instead of water, the device sprays paint.
Types of pneumatic spray guns
Manufacturers on the Russian market offer a large selection of paint sprayers. They differ in price, appearance, characteristics. But their main difference is the type. There are 3 main types of spray guns:
- HP is a budget but outdated device that uses a high pressure system. Due to the powerful air flow, a strong ejection of paint occurs. Only 40% of the solution reaches the surface, 60% turns into a colorful mist.
- HVLP is a type of spray gun with low pressure but high volume of compressed air. The nozzle used in this spray gun reduces jet for car painting, reducing fog formation by up to 30-35%.
- The LVLP is an innovative unit based on the “low air volume at low pressure” technology. The device provides high quality paint coverage. 80% of the solution reaches the surface.
When choosing a pneumatic paint sprayer, each buyer takes into account its purpose, parameters, as well as its financial capabilities.
With which nozzle to take an airbrush for painting a car
Masters use a paint sprayer not only for finishing painting a car, but also for its putty, primer. The nozzle is selected depending on the purpose of use, as well as the viscosity and composition of the material. For example, for painting a car with base enamel, the diameter of the nozzle on the spray gun needs a minimum size, for putty - the maximum.
On sale there are paint sprayers with a set of removable nozzles. Professional craftsmen recommend taking an airbrush with a nozzle that can be removed for painting a car. This allows you to change the nozzle for the desired purpose.
Nozzle for spray gun
Each element of the paint sprayer performs a specific function, ensuring the correct operation of the device. A paint nozzle (orifice) is a nozzle with a hole through which a jet of paint mixture is pushed out with the help of pressure.
Required nozzle diameter for painting a car with an airbrush
The nozzle is selected based on the paint material used, as well as the method of applying the paint. Properly choosing the diameter of the spray gun nozzle for painting a car, the spraying process will become as efficient as possible, and the solution consumption will be rational. If the nozzle size is not suitable, the composition of the mixture will be sprayed with the formation of excess fog or smudges. In addition, improper operation can lead to clogging of the hole and failure of the device itself.
Nozzles in pneumatic sprayers
When the trigger is pressed, the shutter needle in the spray gun opens a hole through which the paint is pushed out by compressed air. Depending on the consistency of the solution and the diameter of the nozzle of the spray gun used to paint the car, the performance of the device is set. The optimal nozzle size for applying paint and varnish material with a pneumatic sprayer:
- 1,3-1,4 mm - base enamel;
- 1,4-1,5 mm - acrylic paint, colorless varnish;
- 1,3-1,5 mm - primary soil mixture;
- 1,7-1,8 mm - primer-filler, Raptor paint;
- 0-3.0 mm - liquid putty.
For high-quality painting of a car, a certain diameter of the nozzle on the spray gun is needed. Some artists prefer to use a universal nozzle size. Experience allows them to reduce paint consumption and achieve good results regardless of the mortar used. But to work with a primer mixture and putty, a universal nozzle will not work - you will need to buy an additional set of nozzles.
Airless nozzles
The spray guns powered by an electric motor have a high performance. Most often they are used in large-scale production of automotive equipment, and not for domestic purposes. For painting a car, an airbrush is needed with a small nozzle, which is designed for an airless spray unit. Nozzle size depends on the viscosity of the mixture used (in inches):
- 0,007 ″ - 0,011 ″ - liquid primer, varnish, stain;
- 0,011″ - 0,013″ - a mixture of low viscosity;
- 0,015″ - 0,017″ - oil paints, primer;
- 0,019 ″ - 0,023 ″ - anti-corrosion coating, facade paintwork;
- 0,023″ - 0,031″ - fire retardant material;
- 0,033″ - 0,067″ - pasty mixture, putty, viscous and viscous composition.
When buying an airless spray gun for painting cars, not everyone can deal with the nozzle and determine what size is needed and what it means. Product marking contains 3 digits:
- 1st - spray angle, calculated by multiplying the number by 10;
- 2nd and 3rd - hole size.
As an example, consider the XHD511 nozzle. The number 5 means the opening angle of the torch - 50 °, which will leave an imprint about 2 times smaller in width - 25 cm.
Electric spray gun
The number 11 is responsible for the diameter of the spray gun nozzle required for painting a car. In the marking, it is indicated in thousandths of an inch (0,011). That is, with the XHD511 nozzle, it is possible to paint the surface with a mixture of low viscosity.
Which spray gun to choose
When choosing a paint sprayer, you need to understand for what purpose it will be used. Airless type spray guns are necessary for painting large equipment: trucks, freight cars, ships. For passenger cars and individual parts, it is advisable to choose a pneumatic device. Next, you should decide on the type of spray, paying attention to the pros and cons of the spray gun:
- HP - suitable for home use. Having selected the appropriate diameter of the spray gun nozzle, the master can use the unit for painting a car with metallic or varnish with his own hands. The paint is well and quickly applied to the surface. But glossy materials require additional polishing, because due to an excess of colorful fog, the coating may not be perfectly even.
- HVLP - in comparison with the previous paint sprayer, this device paints better, consumes less paintwork material. But this type of device requires a powerful and expensive compressor, as well as work under certain conditions. It is necessary to exclude hit of dust and dirt on a working surface.
- LVLP is the best unit with which there is no need to polish the car after painting. But such a spray gun is expensive. And the master who will work with him must be a professional. Errors in operation and uncertain operation of the spray gun will lead to the formation of smudges.
If you are a beginner, then give preference to inexpensive models that will help you gain experience and fill your hand. Also, if you plan to use the unit in rare cases, it is advisable to purchase HP or HVLP paint guns. And professionals who regularly paint cars should take a closer look at LVLP models.
