Different coating methods for automotive coating production lines

First, self-drying paint
in the car paint, self-drying paint mainly refers to alcoholic acid paint and polyurethane paint. For these two types of car paint paint, one is based on the color of the car paint, choose the same performance, the same color of the paint type for repair;
1. Tonic acid paint
for large quantities of car coating production, alicylate paint is often carried out under self-drying conditions, therefore, on the local or edge prism, due to collision damage to the paint film, should also be repaired under self-drying conditions, so that the color of the re-repaired paint film and the color of the car paint film consistent, after repair can not leave obvious repair marks
China
. In general, the edge of the edge of the damaged paint film, can be directly used brush or small brush, the original barrel of the same color alkyd magnetic paint, carefully will damage the site point flat, the color is consistent. However, it should be noted that there should be less paint, fine dot coating, point coating after the paint film must not have the phenomenon of hanging. And for the large surface center and other parts of the damaged paint film, often need to be sprayed paint, in order to easily achieve the desired effect, the method is, first will be damaged paint film with 120-150 s gauze hair, wipe the float, with alcoholic acid or vinyl chloride two-way primer (color should be Close to the paint color) to fill the spray leveling, dry water grinding smooth, wipe dry, with the color change (the same color as the whole car paint) alcoholic acid magnetic paint stirred and appropriate thinning, filtration clean, the damaged part wet wet spray to the paint film flat, color and large surface color consistent. Spray marks around the spray site after spraying, can be used clean soft cloth alcoholic acid thin material (and add a small amount of color paint) gently rub to no obvious fog marks can be if it is in the same area (such as doors, etc.) hit a number of paint film, you can first use fine gauze in turn will damage the site sand, wipe clean, with atomic ash or fast Dry fine putty to fill, polish and wipe clean, spray two primers, dry, the part of the full water grinding smooth, clean drying, with tape and paper to cover the area around the sticker, in the use of the same color acid paint will be the site sprayed evenly, remove the sticker can be. In this way, the finished paint film will not leave fog marks, paint film quality is easy to be consistent with the quality of the whole car paint film.
2. Repaint polyurethane paint
The method of repainting polyurethane paint film should be different according to the type of car, and different methods should be used to repaint. If it is a large and medium-sized passenger car, because the appearance of the bus paint film paint and ribbon paint, so the repaint operation is more troublesome, such as finish paint, you must first use tape and paper to paint the area around the tight cover, in order to prevent the paint when the paint, and paint the ribbon, should also be painted with paper to cover, to prevent contamination of the paint. Usually, the bus board surface or front and rear panel of the paint, such as damaged area within 1-2cm2, it is best to use a brush with the same polyurethane paint to make up uniform flat; Spray flat with a spray gun, that is, first the damaged part with sandpaper or fine sandpaper hair, atomic ash scraping flat, polishing and wiping, re-spraying a polyurethane paint or similar to the color of the paint nitro paint, Dry permeable grinding smooth, clean and thoroughly dried, after wet and wet spray with the same tinted polyurethane paint, to fill the spray around the fog marks, can be thin spray 1-2 times polyurethane dilute (and add a small amount of the same color paint), So that the spray after the fog marks and the surrounding color is not obviously different, in order to make the quality of the paint film after the spray and color and the whole car paint film consistent, no spray marks, it is best to use a large area (including ribbon paint) spray, that is, the same side area of all spray. For the car polyurethane paint film repaint, in order to achieve a better paint effect, often need to be the whole paint, that is, according to the car model, the entire part of the surrounding sticker cover, re-spraying site first with putty and primer finishing flat, and then sprayed with the same tinted polyurethane paint uniform, so that the paint film quality and color easy with the whole car, will not leave a patch marks.
2, drying paint
to dry paint, in the drying equipment and operating position sufficient conditions, try to use the same color of amino paint for paint after drying, but because the whole car coating in the coating process often need to be many times Drying, and paint film after the paint film and the paint film at the same time dryer, paint part because has been once dried, its paint part of the paint film color is often different from the paint film color of the car, that is, the paint part of the paint film color is relatively fresh. In order to overcome this defect, the consciousness uses the whole area to paint, and then dry, so that after drying the whole area of the paint film color is consistent. In this way, compared with the color of the whole car paint film, the color difference is not obvious, but the use of self-drying paint paint, such as amino alcohol acid drying paint, can be the same color of achlic magnetic paint for painting, and ammonia acrylic drying paint, can be used with the same color of polyurethane magnetic paint. The color of the finished paint film can be consistent or approximate with the color of the paint film of the whole vehicle. Therefore, for large quantities of the use of ammonia drying paint coating car production plant, should order the tryptophan drying paint at the same time, should also order the matching paint varieties, in order to facilitate the use of paint. In general, dark colors such as dark blue, blue, green and other amino paint is easier to paint, while light color such as white, milky white and other amino paint is more difficult to paint, after painting often appear paint fog marks, so special attention should be paid.
wednesday. Tonic dry paint
mainly refers to nitro paint and perchloroethylene paint two kinds of fast dry paint paint. For the paint of perchloroethylene, in addition to the use of the same performance as the vinyl chloride paint, the same color of the paint species, in the repaint operation, and the process of filling aolic acid paint is about the same. However, for the repaint of nitro paint, should be patient and meticulous operation to ensure the quality of paint.
the repaint of nitro paint can be divided into four methods: half-gloss paint film repaint, full-gloss paint film repaint, matte paint film repaint and polished paint film repaint.
(1) half-light paint film repaint
semi-gloss paint film paint mainly refers to the use of nitro external semi-optical magnetic paint sprayed after military vehicles and other paint film repaint. It is easier to repaint this kind of paint film, that is, first with gauze will touch the damaged part of the sand, with nitro semi-light magnetic paint and talcum powder and other modulation fine putty will be the damaged part of the scraping, scraping, drying, water grinding smooth, wipe clean dry, and then , with the same color nitro semi-light magnetic paint thinning filter, continuous spray several times, so that the finished paint film and large paint film flatness consistent, consistent color, after the spray fog marks, can be gently wiped off with a clean soft cloth banana water.
(2) full-gloss paint film paint
refers to the use of nitro external magnetic paint after the paint, this paint film paint is more difficult than half-gloss paint film paint, after the paint film not only with the large paint film flatness, but also the color and gloss should be consistent, so in the paint operation, the recent situation as far as possible to use the finish paint, so that the quality of the finished film and the quality of the car film. Before repainting, the damaged part of the sand and with nitro putty scrape flat, dry after the water grinding smooth, clean drying, and then will be repainted the entire area of the four-week sticker cover, and then with the same color nitro-magnetic paint will spray the entire area to paint film flat light, remove the sticker can be.
(3) cover varnish film repaint
if the nitro-flash paint through the hood light, due to the appearance of the paint film damage needs to be repainted, you must first use nitro putty to scrape the damaged part flat, dry after polishing, and then spray nitro-flash paint, and then with thin polyurethane varnish fine spray light, so that the area after the hood and the appearance of the large mask paint quality, not to make a difference or color.
(4) polishing film paint
this kind of paint than the previous several paint is more difficult, need to be patient and meticulous operation. If the damaged part of the paint film belongs to the star point, you can first use a brush or small brush to color thick nitro-magnetic paint (the original barrel paint without thin material), the damaged part of the point is flattened (generally need several dots). Then nitro external use seven or seven times, so that the paint film reached a very flat, to be dried through, and then with sand wax will be the point of the painting site to the mirror-like smooth, not a bit of paint marks, and then with the car wax, the point coating site and the entire area of the surface, repeatedly rub to the light consistent.
And for the damage area is large, it is necessary to use the whole area paint method to repaint, so that the quality of the finished car and the same quality of the vehicle polishing, that is, before repainting, first with atomic ash scraping damaged area, dry after polishing, scraping 1-2 fine nitro putty, After drying smooth water grinding, wipe dry water, will need to repaint the entire area around the sticker cover, re-spray nitro magnetic paint number to, so that the color of the whole paint film and the color of the whole car paint film consistent, to be thoroughly dried paint film, and then polished with sand wax and wax.