Powder spraying production line manufacturers bring you tips of coating production line:

Dusting production line is one of the main products of our company. Our company provides customers with some painting skills here.

1. Overview

The purpose of this method is to meet the requirements of coating quality and operation, and to reduce the chance of coating waste. Through the correct training of coating operation skills and turning this skill into a habit, not only the production efficiency can be improved, but also the coating quality can be improved. Below we will introduce the basic techniques used when using airless or general air atomization equipment.

2. Preparation before painting:

The spray gun and related equipment shall be cleaned and in normal working condition. Check whether the spray gun has an ideal spray shape. The ideal spray should be symmetrical, uniform atomization and clear edges. Only a small amount of paint mist particles exist outside the spray edge. The capacity of the air compressor should be in line with the requirements of the equipment manual. For example, gpq6c airless spraying machine should be equipped with 1.6-2.5 cubic meters or 2.5 cubic meters air compressor when the specified air consumption is 300-2500 L / min. In order to ensure enough air intake, the inner diameter of the air outlet pipe of the air compressor and the air inlet pipe connected to the spraying machine shall not be less than the diameter of the air inlet pipe specified in the manual

3. Spraying pressure

To achieve the right atomization pressure conditions: the minimum atomization pressure required for ideal atomization is achieved. Therefore, the principle that should be followed when adjusting the pressure is: "the spray shape is good, the pressure is set" (the pressure should be as low as possible) the excessive pressure will not improve the coating quality, only will shorten the life of the equipment and increase the wear of the nozzle, and will make the paint rebound, waste the paint and pollution space.

4. Painting skills

① Overview

a. Before pulling the gun, the gun should be in motion;

b. Keep the distance between the spray gun and the workpiece constant, not long or short;

c. The spray gun should move at a uniform speed during spraying;

d. When spraying the same work, the starting point of the first spraying stroke should be the same;

e. The surface of the workpiece should be covered with wet paint;

f. The overlapping amount of adjacent spraying stroke is consistent;

g. For the same workpiece, the spraying stroke times should be consistent;

② Spray gun distance

a. The distance between the spray gun and the workpiece is about 15cm-20cm for ordinary air atomization and 30-38cm for airless spray atomization

b. In order to get wet, deep color and thick coating, the spray gun can be closer;

c. In order to obtain a dry, light and thin coating, the spray gun can be far away;

③ Spray stroke

a. The moving track of the spray gun is parallel to the surface of the workpiece;

b. The spray gun body should be vertical to the workpiece surface, otherwise the coating will be wasted;

c. Do not let the spray gun arc movement, in order to move the operator's forearm and shoulder, not only the wrist movement;

d. There should be a overlap between adjacent spraying lines; for ordinary airless spraying, the overlap is 50%; for airless spraying, the overlap is 25%;

e. When the uniformity of coating thickness is required to be high, the cross spraying method should be adopted, and the spraying in the straight direction should be carried out first.

f. When spraying outside the air, pay attention to the wind direction, and the unpainted surface should be under the wind, so as to bring the flying paint and rebound to the unpainted surface.

These basic skills only play the role of casting a brick to attract jade. Due to the great differences between the workpiece and the coating, users can determine the suitable spraying skills according to their own actual situation and combined with these basic principles. The correct operation and maintenance rules of the equipment have been explained in detail in the operation manual of various types of spraying equipment. Here, only some problems that are easy to be ignored by users are discussed.

1、 Matters needing attention before putting equipment into operation

1. The capacity of the air compressor provided by the user shall meet the air consumption specified in the manual, and shall be greater than the consumption as far as possible. The outlet pipe and inlet pipe orifice shall meet the requirements in the manual, so as to maintain sufficient air intake.

2. The compressed air from the air compressor enters the spray equipment after being filtered, which is conducive to ensuring the service life of the pneumatic system.

3. The coating should be filtered first, and the filter screen should be selected according to the viscosity and particle size of the coating. If the filter screen is too fine, the coating is not easy to pass through, and if it is too coarse, the spray gun is easy to be blocked.

4. The air compressor should be far away from the painting site as far as possible to reduce the possibility of compressor pollution.

5. All airless spraying equipment should be well grounded to avoid electrostatic sparks.

2、 Precautions in spraying process

1. In the spraying process, when cleaning, changing the nozzle or not spraying, the self-locking baffle of the spray gun trigger should be locked in time. In any case, the spray gun mouth is not allowed to face other people to avoid injury.

2. If the spraying pressure is as low as possible, too high coating pressure will not improve the coating, but will shorten the service life of the equipment, increase the wear of the nozzle and increase the unsafe factors.

3、 Precautions after spraying

After spraying, the equipment should be cleaned in time. The cleaning of pneumatic airless spraying equipment is generally divided into three steps

1. Discharge of paint: lift the suction pipe from the paint barrel to make the pump run without load and discharge the remaining paint in the pump, filter, high-pressure hose and spray gun.

2. Insert the suction pipe into the digester with no-load cycle, and clean all parts of the equipment with no-load cycle.

3. For the discharge of the solution, lift the suction pipe out of the solution bucket, circulate without load and discharge the solution.

It is very important to keep the equipment in good condition and prolong its service life