(2) the direction of air flow in the painting room must be from the ceiling to the ground along the direction of gravity, and the air is discharged from the ground and filtered into clean air.
(3) Ensure that the indoor air is ventilated twice per minute, so the indoor air speed should be 0.3-0.6/s. If the air speed is too high, the paint will be lost too much, the coating will be in poor condition and the air speed will be too low, which will affect the normal volatilization of the solvent.
④ Good lighting conditions.
⑤ Ensure that there is no negative pressure in the painting room. It can be achieved by controlling the air intake and exhaust, and the air intake into the spray booth is slightly more than the air exhaust.
⑥ The working noise in the painting room is not allowed to exceed 85dB.
All landowners meet the requirements of fire prevention.
When painting the car, you should pay attention to spraying as much as possible (the touch-up paint must have color difference at the intersection). Can you use as little sheet metal as possible without sheet metal (the place where sheet metal has been used will definitely be much softer)?
What should I pay attention to when painting cars? 1) Configuration purpose. Spray booth is one of the essential and important equipment for automobile maintenance and painting. The purpose of the spray booth of the device is to provide a clean, safe and well-lit spraying environment for automobile painting construction, so that the spraying construction is not disturbed by dust, the painting quality is guaranteed, the volatile paint mist is limited in a limited space, and the environmental pollution is reduced.
2) Technical requirements of spray booth. ① The air entering the spray booth must be strictly filtered to ensure that there is no dust in the air. (2) the direction of air flow in the painting room must be from the ceiling to the ground along the direction of gravity, and the air is discharged from the ground and filtered into clean air. (3) Ensure that the indoor air is ventilated twice per minute, so the indoor air speed should be 0.3-0.6/s. If the air speed is too high, the paint will be lost too much, the coating will be in poor condition and the air speed will be too low, which will affect the normal volatilization of the solvent. ④ Good lighting conditions. ⑤ Ensure that there is no negative pressure in the painting room. It can be achieved by controlling the air intake and exhaust, and the air intake into the spray booth is slightly more than the air exhaust. ⑥ The working noise in the painting room is not allowed to exceed 85dB. All landowners meet the requirements of fire prevention.
3) Classification of spray booth. According to the different ways of removing paint mist and preventing dust from mixing, the spray booth can be divided into dry and wet types. ① Dry spray booth. Dry spray booth is mainly composed of cavity, filter, exhaust pipe and ventilator. It is characterized by simple structure, low coating loss and high coating efficiency. Because it does not use water and has low cost, it is widely used by small and medium-sized repair enterprises in China. ② Wet spray booth. Wet spray booth can be divided into four types: spray booth, water curtain booth, text booth and rotary booth. For the painting of top-grade automobile topcoat, Wen-style or water-spraying spray booth is mostly used abroad, but it is rarely used in China.
4) Maintenance of spray booth. (1) All preparations before painting shall be carried out outside the painting room. ② The filter must be checked frequently and replaced at the specified time. (3) Check the barometer reading every day to master the range of air pressure in the painting room. Negative pressure is strictly prohibited. (4) Dry spray booth should wet the ground before spraying construction to prevent dust. ⑤ Check the lighting regularly and replace the weakened or burned lamps. ⑥ Regularly lubricate and maintain the exhaust fan and motor. ⑦ Pay attention to personal hygiene, and it is forbidden to enter the spray booth wearing dirty clothes. ⑧ After each painting operation, it should be thoroughly cleaned, and the related equipment in the painting room should be maintained and cleaned.
Precautions for car painting, car painting needs to pay attention to what the car is exposed to the sun for a long time, and the car paint will inevitably fade. Sometimes, it is inevitable that the car will scratch. At this time, the car paint can be restored by painting the car. What are the precautions for painting the car?
Automobile paint
Matters needing attention in automobile painting-choose a better garage
4S shop
To paint the car, you should choose a repair shop with good reputation and good technology, not necessarily a 4S shop, the price is too outrageous, and some experienced maintenance masters open their own repair shops.
Matters needing attention in automobile painting-discuss the price in advance
If you don't repair your car in a 4S shop, when you go to other places for plastic painting, you should talk about the price and how much money in advance to avoid various disputes after repairing your car.
Precautions for car painting-plastic work should be in place
Car plastic surgery is the key, plastic surgery is not good, and the car surface looks uneven, which affects the appearance. While the repairman is shaping, you should watch and carefully observe whether the other person's shaping is flat or not.
Matters needing attention in automobile painting-putty should be evenly applied
spray paint
The second step of plastic surgery is to apply putty. When I was repairing the car, I found that plastering putty was for teaching disciples. It doesn't matter, but after they are plastered and polished, you should touch them carefully with your hands to see if they are smooth and uneven. If so, let it be reworked.
Matters needing attention in automobile painting-pay attention to position and paint mixing.
When painting, there should be a suitable place, usually a closed painting room, so as to ensure the quality of painting. After painting, let the car dry fully. I suggest painting as much as possible when the temperature is high.
Car painting is also a big project of car maintenance, so you should choose it carefully, otherwise the mottled color will damage your image. Friends who want to paint cars should pay more attention to the precautions of car painting.
What should I pay attention to after painting cars? 1, check the color difference between car paint and original car paint.
2, check the paint smoothness
3. Don't wash the car or touch other things.
4. It is suggested that the newly sprayed car be placed in the sun, which can not only speed up the drying of paint surface, but also find some problems.
Excuse me, long-term painting. What to pay attention to. The most harmful substances of paint to human body are formaldehyde, benzene, TVOC and so on.
Formaldehyde is a colorless and soluble gas. Wood-based panels such as particleboard, density board, plywood, adhesive and wallpaper are the main sources of formaldehyde in the air, and the release period is as long as 3 ~ 15 years. It can be absorbed through respiratory tract, and the harm of formaldehyde to human body has the characteristics of long-term, latent and concealed. Long-term inhalation of formaldehyde can cause serious diseases such as nasopharyngeal carcinoma and laryngeal cancer.
Benzene is a colorless gas with a special aromatic smell. Glue, paint, coating and adhesive are the main sources of benzene in the air. Benzene and benzene series can be anesthetized by the central nervous system after being inhaled by human body; It can inhibit human hematopoietic function, reduce red blood cells, white blood cells and platelets, and increase the incidence of aplastic anemia; It can also lead to abnormal menstruation in women and congenital defects in the fetus.
Benzene operation: increase the supply of vitamin C, protein and carbohydrates; Increase vitamin B and iron; Reduce the supply of fat.
What should I pay attention to when painting cars? There are three points to pay attention to when painting:
First, adjust the gun
Before spraying construction, the spray gun and related devices should be clean and in normal working condition, and check whether the spray gun produces ideal spray shape. The ideal spray shape should be symmetrical, with uniform particle size distribution and clear edges, and only a small amount of paint mist can exist outside the edges of the spray shape. Low atomization pressure is helpful to produce correct and uniform spray shape and reduce rebound and overspray.
Second, holding a gun.
The correct spraying trajectory is perpendicular to the workpiece surface. When spraying, according to the angle of the coated surface, the distance between the spray gun and the sprayed surface is generally 15~30cm. In order to obtain a wetter, darker and thicker coating, the distance can be closer; In order to obtain a drier, lighter and thinner coating, the distance can be longer.
Third, take the gun.
The operation of spray gun includes the angle between spray gun and coating surface and the execution speed of spray gun. The spray gun should be at right angles to the surface of the coated object and run in parallel. The moving speed of the spray gun is generally adjusted between 30~60cm/s and required to be constant. If the spray gun is inclined into an arc or the moving speed is variable, the paint film with uniform thickness will not be obtained, and stripes and spots will easily appear; If the execution speed of the spray gun is too slow (below 30cm/s), it is easy to sag. There should be overlap between adjacent spraying strokes, that is, the overlap rate should reach 50%-60%. If it is too fast or there is not much overlap, it is not easy to get a smooth paint film. When uniform paint thickness is required, cross spraying method should be adopted, and then horizontal spraying should be carried out.
Matters needing attention after spraying:
Check the fullness and uniformity of paint film.
Looking directly at the fullness of the paint film, we can see that the paint film is too thick, feels turbid, the paint surface is not bright, the paint film is too thin, the paint surface is not bright enough, and the paint surface is dark. A plump paint film feels like a layer of oil floating on the paint surface. The top coat should have a mirror effect, and the front and squint paint lines should be consistent with the original paint lines. In addition, there can be no paint line, even after polishing, there are paint lines, and so is the original car paint. Without drawing lines, the effect is not good.
Check whether the color of the paint is consistent with the original paint.
First, drive the car in a well-lit environment, carefully observe the touch-up paint surface and the close-fitting car body, and stay for 7 ~ 10 second (eyes should not be too long, which will cause visual fatigue). Observe whether there is obvious color difference by crossing the direct view and side view (30 ~ 45 degrees). Pay attention to the dark car facing the light ratio and the light car facing the light ratio.
Check whether the granularity of metallic paint is uniform.
Check the paint at close range (10 ~ 20 cm), and you will find that there are small particles in it, just like the stars in the night sky, but much closer than the stars. Observe whether their size, color and arrangement are consistent and uniform, and whether they are in harmony with the original car paint.
Check whether the paint surface is gray and flowing.
When the air in the painting or curing barn is unfiltered or improperly filtered, and some technicians construct it improperly, dust will accumulate on the paint surface and form pits, commonly known as "dirty spots". Touch the screen with your hand to feel whether there are concave and convex foreign bodies.
Check whether there is flying paint on the rubber parts outside the car.
Check whether the rubber parts near the painted parts are painted. If flying paint is found, the owner can ask the manufacturer to wipe it with gasoline or cleaning solution. Because in the process of construction, workers will fly paint without covering it properly.
Sometimes, the quality of a painting can not be distinguished in a short time, and the only way to test it is time. Only by choosing a company with high credibility can consumers ensure the quality of touch-up paint. In fact, the most important thing for car repair is to be careful. Without a good mechanic, no matter how good the equipment is, no matter how good the paint is, it is useless.
What should I pay attention to when drawing? 1. Before spraying, it is necessary to check whether the spraying air pressure is normal and ensure that the filtration system is clean;
2. Check the air compressor and water-dust separator in the paint room to keep the paint hose clean.
3, spray gun, spray hose and paint mixing tank should be stored in a clean place;
4. Except for dust removal with spray gun and sticky dust cloth, all other pre-spraying procedures should be completed outside the painting room;
5. In the painting room, only spraying and baking processes can be carried out, and only vehicles can open the door of the painting room. When you open the door, you must start the air recirculation system during spraying to generate positive pressure to ensure that outdoor dust cannot enter the room;
6. You must wear designated spray-painting clothes and safety protection equipment to enter the spray-painting room for operation;
7. When baking, flammable items in the painting room must be taken out of the room;
8. Non-essential personnel are not allowed to enter the spray booth.
When painting cars, we should pay attention to the environment in which the painting room should paint, so that the painting room can work normally; If you paint outdoors, you need to pay attention to the size of the dust in the air, reduce the dust as much as possible, and pay attention to the wind direction, standing in the windward position to paint.