The spray gun or spray gun (paint sprayer) is an important and accurate tool in the painting technology, the quality of the resulting paint and varnish coating [1] and the economical use of paint and varnish are primarily dependent on its operation. Convenient location of the gun in the hand, ease of inclusion, the presence of all the necessary regulators and easy access to them, the use of corrosion-resistant and wear-resistant materials in the design, the availability of spare parts make it possible to use the spray gun for a long time without repair and repair kit replacement.
The airbrush greatly facilitates the execution of painting, and serves as the best opportunity to carry out work, both with simple acrylic paints, metallic, and other paints and varnishes. The airbrush is noteworthy in that it helps the painter to apply paint or varnish in an even layer.
Content
Design
The design of the spray guns may be different. In general terms, it must satisfy the following requirements:
- the spray gun should be light, the center of gravity and the shape of the handle should be such that the fatigue of the painter during operation is minimal
- parts of the head of the spray gun - material nozzle and locking needle - must have high anticorrosion properties and wear resistance
- the spray head must have several sizes with different hole diameters of the material nozzle
Spray Methods
There are electric and manual types of spray guns that work on three main technologies:
- Airless spray
- Pneumatic spraying
- Combined spray
Advantages of airless and combined spraying methods:
- high labor productivity
- wide viscosity range of applied materials
- material saving
- reduced fogging
- painter mobility
- environmental friendliness
Limitations of the airless method:
- the difficulty of obtaining glossy coatings
- LKM should be pure, particles to 100 microns
- electronic stabilizer
- relatively high cost of the apparatus
- potentially increased risk of injury
- need special skill and qualification
The simplest tool that even a novice can easily understand is a manual spray gun. Its main advantages and differences from other devices are: high reliability, ease of use and low price. This spray gun can be described as a simple pneumatic pump with a hose and valves. And it does not differ in any special subtleties, it is simple and accessible even for an unprepared master. But, as a rule, it is applicable to water paints, labor productivity is low. Painting with a spray gun in this case will not be of the highest quality, but it will be at an acceptable level. Pneumatic spraying is based on the use of compressed air. Unlike manual spraying, pneumatics already require some handling experience. The paint is applied under the pressure of compressed air.
Type of material supply and location of the paint tank
Depending on the method of supplying the paintwork material (LKM) to the spray head, the spray guns (spray guns) are divided into four types:
- with the supply of paint and varnish from the upper spray cup (spray guns with the upper tank), it has better throughput with increased viscosity of the material.
- with paintwork from the lower paint can (spray guns with a lower tank), it is recommended for painting large parts, for example, the sides of a cargo van or the entire car body with uniform enamels of the same color.
- with the supply of paintwork materials under pressure from the paintwork system (paint spray tank, feed pump, centralized spray gun) (spray guns with forced feed). The method is acceptable where, for a long time, a large volume of parts has been painted with one color.
- With the lateral arrangement of the colorful container, its versatility of use can be called a significant advantage since the rotating connection allows you to work with both vertical and ceiling surfaces, while the paint does not pour out into the face.
Notes
- ↑ Guidelines for the training of inspectors on visual and measuring quality control of paint work ”/ Ch. ed. Pirogov V.D .. - Yekaterinburg: Publishing House "Origami", 2009. - 202 p. - ISBN 978-5-9901098-1-5 .
Links
- “Pocket Guide to the Anti-Corrosionist” - Yekaterinburg: OOO Origami Publishing House, 2008-264 s, 264 s, ISBN 978-5-904137-01-4