How to solve the problem of painting wooden furniture with "oil-to-water" (II)

In the furniture coating process, we choose not only suitable for water-based wood paint spraying, but also in line with the actual production efficiency of the "good" spraying system is necessary to obtain high-quality products. A good spray gun is an indispensable tool in furniture coating, how to correctly operate this air spray gun to paint furniture? Below I'll share with you how to do the efficient atomization of the gun.
Efficient atomization allows the coating to be evenly distributed, reducing bubbles and solvent cladding residues in the paint film, providing conditions for a better paint film, and providing sufficient atomization effect to make the paint particles smaller, paint better perforation, and the wet film after spraying a smoother . At the same time, the facade spraying for water-like paint can greatly improve the anti-flow hanging, reduce the adverse rate of the product. Therefore, the atomization effect of the spray gun is very important, before explaining how to use the correct method to adjust the air gun to get the efficient atomization effect, we must first understand the working principle of the common air gun.
1 Gravity spray gun: relying on the paint's own gravity and nozzle, wind cap between the formation of the Venturi effect to produce a vacuum pressure difference to drive the paint out, and then through the gun cap under the role of compressed air to form atomization.
2 on the suction gun: mainly rely on the Venturi effect through the straw from the gun cup paint spray, and then through the gun cap under the role of compressed air to form atomization.
3 pressure delivery spray gun: mainly rely on conveying equipment to press paint for the gun body feed, and then through the gun cap under the role of compressed air to form atomization. (Generally using pressure tanks or diaphragm pumps for the supply of coatings)
We can learn from the above-mentioned air spray gun how to work, the gun mouth part is the gun spray effect is good or bad key components, it consists of the gun cap, nozzle, gun needle three parts.
gun cap has 3 different holes, the middle is the center of the main atomization hole, the center of the main atomization hole on both sides of the auxiliary atomization hole, the two ends out of the side hole for the fan control hole, the gun cap manufacturers will generally mark the caliber of the supporting nozzle. If there are paint residue, improper cleaning, pore blockage or deformation, will destroy the flow balance of compressed air, air spray gun atomization effect is poor or spray-shaped so as not to get a good coating effect.
atomization of the air spray gun is done by adjusting the three knobs of the gun body:
(1) air pressure adjustment device;
the shape ejected by the atomization of the air gun is oval shape, we can roughly divide the graphic into 3 areas (as shown):
01 center humid area
atomized particles are the most concentrated and evenly dispersed area, the first wet. This area is large and the higher the spray efficiency.
02 atomization area
atomized particles concentrated in a uniform dispersion area, the larger the area of the area, the finer the atomized particles, the better the atomization effect.
03 excessive atomization area
atomized particles are not concentrated in the over-dispersed area, the smaller the area, the better. The overall atomized particle size can be directly observed in this area.
when we spray gun atomization adjustment operation is not at that time, although the spray gun is spraying, but the wet film effect and paint mist rebound phenomenon is very different. How to maintain the best balance between paint mist fineness, bounce, and equizzle flow. We can refer to the following method steps for gun atomization adjustment: (the spray gun needs to be equipped with an air pressure meter)
01 Before use to identify the use of gun-type desiccation air pressure values. (Environmental air spray gun is about 2kgf/cm2)
02 on the good paint after adjusting the flow, spray amplitude, air flow knob to the maximum, pull the gun trigger to the second gear, twisting the air pressure meter adjustment knob to adjust the jet gun air pressure to the standard value, do not only buckle the first air channel regulation air pressure meter.
03 After observing the spray paint mist or test plate point-to-point vertical spray, look at the spray angle as a rule oval (if a shape is found, the problem needs to be eliminated before continuing).
04 adjust the spray amplitude according to the painted furniture work piece.
05 The spray rate requirement when adjusting the flow rate to normal operation (the coating amount of the work piece is up to standard).
06 work parts spraying work, observe the effect of wet film after spraying, in the case of satisfactory results, as far as possible to reduce the air pressure. (e.g., when spraying the inside of the cabinet, when spraying angled work parts, or when wet membrane meters are found to be dry too fast, etc.)
When the atomized air is too large, it can cause problems with the table drying faster or the paint rebounding, which should be appropriate to reduce the atomized air pressure to reduce the impact. It is basically recommended to minimize the atomized air pressure when the size of the coating atomized particles meets the coating requirements. If the paint effect is not satisfactory, you can adjust the gun flow knob, reduce the flow rate, slow down the spray speed or need to replace the large one-caliber nozzle kit. (It is not recommended to continue to increase the air pressure to increase the atomization fineness, which can exacerbate the overspray phenomenon)
In addition, when we use conveying equipment to press the paint, we also need to pay attention to the pressure that the paint delivers to the gun body. Since coatings are delivered by pressure, different sizes of paint pressure have an effect on regulating paint flow. When the coating pressure at the nozzle is too high, the precision of adjusting the spray flow is greatly reduced. When the operator adjusts the flow, it is too large to lower, or it is too small to reduce, which brings a lot of inconvenience to the spraying operation. Second, it will speed up the wear of nozzle components and shorten the service life of the equipment. If in this case, we can not prevent to try the following small methods to solve the above problems:
we first set the gun flow knob to the maximum, close the intake knob, pull the trigger in the end, adjust the pumping oil output knob, let the spray gun spray paint horizontal head is about 15-25CM between the appropriate (as shown in the distance), and then the above spray gun spray atomization adjustment action, you will find the spray gun flow adjustment, paint fog effect better control!
than the gravity spray gun and the upper suction gun when spraying the same paint, the nozzle calibre is smaller. The larger the caliber, the greater the air pressure. When we take a large-calibre spray gun when used as a small-calibre spray gun, it will aggravate the atomized paint spray splash, affecting the atomization effect. Therefore, the air gun system hardware support is the basis of efficient atomization operation.
, do we have a new understanding of the atomization regulation of air spray guns? Try it after reading it! Do you still have problems with gun atomization when painting furniture? The overall solution of Dabao paint coating service provides the correct choice and operation method of eco-friendly spray gun, which can achieve the perfect output of furniture paint spray effect. Dabao paint professional services team always at your service!