Wood furniture is painted | Spraying procedures and precautions

Wood furniture coating, spraying is currently the most important coating method, divided into manual and automatic spraying, static and non-static spraying.
each is divided into traditional air spraying, HVLP, LVMP and other medium and low pressure air spraying, mixed gas, airless spraying, electrostectric spraying, centrifugal spraying (rotary cup, disc).
the selection of suitable spraying methods and technologies according to different processes can improve the surface quality, production capacity, reduce the consumption and cost of coating materials

.
air spray
a coating method that atomizes the lacquer liquid into atomization with the help of compressed air flow and sprays it on the surface of the object.
with spray construction, you can obtain a thin and uniform paint film, there are gaps, small holes in the surface and tilt, curve, uneven places can be sprayed evenly, construction efficiency than manual brush 5∽10 times faster∽
but spraying method construction needs to paint with solvent thinning, in the operation of a large number of paint fog, resulting in waste and harmful to the human body.
, there are more advanced electrostectrectrulative spraying, high-pressure airless spraying, thermal spraying, etc. , can overcome this shortcoming to a certain extent.
spray construction, the operator shall, according to the nature of the paint and the requirements of the coating object, reasonably select the spray and specify the construction steps.
air spraying equipment is the spray gun and the spray gun-related air compressor, oil and water separator, spray room and a set of equipment.
different spray materials and spray objects, their operating procedures are different, but summarized, its basic operating procedures mainly have the following points.
1 paint preparation
first, mix well before use. In the storage process, such as primers, magnetic paint and other lacquer, their internal pigments will produce precipitation phenomenon, and even the occurrence of floating color, gloom, hardening.
use, open the paint cover, check the status of the paint, and then mix well with a clean mixing stick.
spray construction on the viscosity requirements of lacquer liquid is more stringent, often to dilute the thick paint. Diluents should not be abused during dilution, depending on the composition and nature of the paint base, it is best to choose a matching thinner.
other thinner addition to moderate, too much will cause flow, too little paint film easy to produce orange peel. The paint material has been fully adjusted, to use 120∽140 mesh copper wire sieve or filter cloth filtration, so as not to affect the smoothness of the paint film, blocking the spray gun.
2 Spray operation
(1) vertical spray method: small holes on both sides of the nozzle are vertically aligned with the paint hole, moving down from the upper left side of the coating to a right angle, then spraying up, and pressing (covering) 1/3 of the width of the previous time, so spray past and press past in turn.
(2) horizontal spray method: small holes on both sides of the nozzle and the center paint hole into a horizontal straight line, from the upper left corner of the coating to the right, sprayed to the right end and then sprayed back, back spray flow pressed the first 1/3 width, in turn to and from the ground layer pressed a layer, each spray layer thin on both sides are pressed on a thin layer, which makes the entire coating thick and thin.
(3) cross-sectional alternating painting method: cross-sectional spray once, commonly known as "a cross." Spray it once, and then spray it across the line. Or spray horizontally and then vertically. This will make the paint smooth and dry, bright and beautiful. Construction does not need to change the angle of the nozzle frequently, but to change the position of the builder or work piece can be.
above only for reference
3 Precautions
to regularly discharge air compressor, oil and water separator fluid, can not let the air compressor and oil and water separator in the fluid sprayed on the surface of the coating, so as not to cause film bubbles, hemp points, whitening, oil flowers and other ills.
paint should be strictly in accordance with the requirements of the ratio, stirring with a filter filter, spraying before and after spraying, spray gun must be cleaned with clean solvents, so as not to paint residue, blocking the muzzle.
the ventilation conditions of the spraying environment must be good, so that the paint mist when spraying timely discharged from the outdoor, the environment and operators should reduce the dust into. At the same time, the exhaust device should be installed in front of the operating point, not to make the flying paint fog rise;