Technical defects and treatment methods of paintin

2022-07-22
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When producing wooden doors and painting them by spraying, it is inevitable to sometimes encounter some inevitable problems and technical defects. So, how to deal with this problem? Next, SENRUN wood door professional spray paint master summarizes a few points, hoping to help you

when producing wooden doors and painting them by spraying, it is inevitable to sometimes encounter some inevitable problems and technical defects. So, how to deal with this problem? Next, SENRUN wood door professional spray paint master summarizes a few points, hoping to help you

[orange peel]

1. Causes

(1) insufficient spraying pressure and poor coating atomization; (2) Spraying distance is too far; (3) The viscosity of paint is too high, and the atomization of paint liquid is not good; (4) The coating temperature is too low and the leveling property is poor; (5) The moving speed of the spray gun is too fast or too slow; (6) The nozzle is worn and the paint liquid is not atomized well; (7) Improper selection of spray gun model

2. Treatment method

(1) increase the spraying pressure; (2) Control the spraying distance; (3) Adjust the viscosity of paint; (4) Increase the spraying temperature and improve the leveling property; (5) Correctly grasp the spraying speed; (6) Replace the nozzle; (7) Select the appropriate spray gun according to the coating performance

[particles]

1. Causes

(1) the spray gun moves too fast and the spraying is uneven; (2) The spraying pressure is too low, and the coating atomization is not good; (3) The nozzle aperture is small, the pressure is too large, the spraying distance is too far, and the paint liquid has not reached the surface and has gelled; (4) The spraying amount is too small to form a continuous film; (5) The filtering system of the spraying machine fails; (6) There are dirt such as dust, debris and wood wool on the surface of the substrate; (7) The used spray gun is not cleaned, and the paint particles are sprayed out

2. Treatment method

(1) control the moving speed of the spray gun, preferably at 30-1250px/S; (2) Adjust the spraying pressure; (3) Spray correctly according to the operating procedures; (4) Increase the spraying amount; (5) Check and repair the filtration system; (6) Thoroughly clean and remove dust on the substrate surface before spraying; (7) Thoroughly clean the spraying equipment after spraying

[sagging]

1. Causes

(1) uneven spraying pressure; (2) Spraying distance is too close; (3) The spraying speed and paint output are unbalanced; (4) Excessive spraying amount; (5) Incorrect spraying angle; (6) The spraying ambient temperature is too low; (7) Large nozzle, high pressure, large paint output

2, treatment method

(1) control the spraying pressure; (2) The distance shall be controlled within 15-625px; (3) Adjust the spraying speed to maintain a balance with the paint output; (4) Control the spraying amount; (5) Maintain vertical spraying; (6) Increase the ambient temperature; (7) Select the appropriate nozzle and pressure, control the paint output

[bubbles]

1, cause

(1) the filtering system of the spraying machine is wrong; (2) One time spraying is too thick; (3) The spray gun pressure is too large and the spraying distance is too far; (4) Solvent volatilizes too fast

2. Treatment method

(1) check and repair the filtration system; (2) Control the spraying amount; (3) Control the spraying pressure and distance; (4) Add an appropriate amount of slow volatile flux

[whitening]

1. Cause

(1) water is mixed in the paint; (2) Water is mixed in the paint; (3) The wind speed in the spraying room is too high; (4) Excessive addition of low boiling point solvent

2. Treatment method

(1) check the oil extraction separator; (2) Control the relative humidity in the spraying room; (3) The wind speed is controlled at 50-2000px/s; (4) Control the amount of low boiling point solvent added

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