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12

2019

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11

Painting techniques and the use of spray guns

Author:

Chuangzhi Coating


In the manual painting process, many painters are not able to master the techniques of painting and the method of spray guns, so that in the spraying process, uneven coatings, bumps and other bad products and serious waste of paint are caused. Therefore, we have compiled the necessary operation skills and gun-cutting techniques for the paint. After practicing, we will practice it. I believe that you will be able to solve your problems now.

Painting techniques

1. Paint technique
(1.) When painting in cold weather, be sure to wait for the paint to dry and then cover the second paint. If the brightness is too bright, the second paint must pay attention to the distance and speed of the gun.
(2.) 1k paint can't be sprayed too brightly. If it is too bright, it will show the original paint. If it is used for the screening, it will be washed and then re-made.
(3.) Thinner must not be placed more, only less. 1:08~1.
(4.) When spraying a paint, it is necessary to estimate the dosage. It is not enough to use black or white paint mixed with the original paint to cover the original paint.
(5.) The red paint is better covered with a white background, and the color is brighter.
(6.) If the paint surface is too thick, the dilution is too much or the pressure is not stable.
(7.) When painting, from the inside to the outside, back to the front, high to low spray, pay attention to details and dead ends.
(8.) When painting, the air pressure should not be too big or too small. Just too much, too much paint will look rough, too little paint will not be able to spread.

the use of spray guns

2. the method of spray guns
(1.) Spray pressure.

The correct spray pressure is related to the type of paint, the type of diluent, and the viscosity after dilution. Generally, the gas pressure is adjusted to 0.35 to 0.5 MPa, or it may be determined by test spraying. If the pressure is too low, there is a possibility that the atomization is not good, the diluent will be volatilized too slowly, and the paint will be sprayed onto the surface of the workpiece like rain, which is prone to "tears", "pinholes" and "bubbling". When the pressure is too high, it is likely to evaporate, and when it is severe, it will form a dry spray phenomenon.

(2.) Control of the gun trigger.

The deeper the trigger is, the higher the liquid flow rate. At the beginning, the amount of paint supply is small. As the gun moves, the amount of paint is gradually increased until the end of the gun is released, and the trigger is released, so that the amount of paint is greatly reduced, thereby obtaining a special transition effect.
(3.) Mastering of spraying methods and routes.

The spraying method includes a vertical overlapping method, a horizontal overlapping method, and vertical and horizontal alternate spraying. The spraying route should be in the order of “high to low, left to right, top to bottom, first and second”. The gun is closed at the end of the stroke. The stroke of the second unidirectional movement of the lance is opposite to the first one. The nozzle is flush with the edge of the first stroke, and the upper half of the mist overlaps with the lower half of the first mist. The overlap of the second shot should be about 1/3 or 1/2.
(4.) The angle of the spray gun to the work surface.

The spray gun must be perpendicular to the work surface (90°) and must never be curved by the wrist or elbow.

the use of spray guns

(5.) The speed at which the gun moves.

The moving speed of the spray gun is related to the drying speed of the paint, the ambient temperature, and the viscosity of the paint. Generally, it should be moved at a constant speed of about 30 cm/s. If the gun moves too fast, the coating will be too thin, and the gun will move too slowly, which will cause sagging.
(6.) The distance between the nozzle and the work surface.

The normal spray distance should match the air pressure of the gun, the fan adjustment of the gun, and the type of paint. Generally, the spraying distance is about 20cm. The actual distance can be determined by spraying the paper on the wall. If the spraying distance is too short, the speed of the spraying airflow will be higher, which will cause the coating to ripple. If the distance is too long, it will be Excessive solvent is evaporated, causing the coating to appear orange peel or dry, and affecting the color effect.

The above is about the "Painting techniques and the use of spray guns", the information is provided by 25 years of coating production line manufacturers Chuangzhi finishing, more information about the coating production line equipment, welcome to pay attention to us to get updated information!

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