Steel Drum Painting Defect and Solution

In recent years, the paint coating for steel drums many varieties have their own characteristics and requirements. How to correctly use the coating is a highly technical work , many of the important aspects and factors influencing operator is often overlooked , causing paint coating process produces a variety of morbid . Morbid generated in the coating is difficult to avoid, the key is to take timely and effective control measures.

1 . Why steel drum coating was dried coating surface area ranging from granular ?

Produce this morbid reason drums pre-treatment and painting environment is not clean, dust caused by floating drums surface impurities ; paint mixed with impurities, high viscosity of the paint ; gun nozzle diameter of the compressed air pressure mostly inappropriate Lo gun mouth too far away from the surface with steel drums to walk too much from the gun muzzle small , pressure , etc. are the main reason for generation of particles .

Control methods are: painting place to do clean and dust ; steel drum surface before painting to smooth and no defects , no dust and impurities ; paint viscosity should be suitable modulation Lo I Yin muzzle diameter , spray pressure size , distance and other gun parts to strictly enforce the provisions of the coating process parameters , the test parameters selected reasonably coating ; paint should be filtered before use .

2 . Why steel drum coating surface after painting hanging downwardly from the accumulation of small bead coating , such as severe sagging Manzhang like ?

Paint on a vertical surface by gravity fall , because the viscosity of paint too thin modulation , than the major pigment in paint too ; diluent is not complete ; uneven surface to be painted ; pre-treatment is not good , the surface of oil, water ; gun too close to the workpiece , such as spray pressure caused by size does not fit .

Control methods are: not too thin viscosity paints modulation ; pre-treatment to completely free of oil, water, smooth ; gun and the workpiece to process the selected range ; muzzle diameter is not too large ; Using air pressure should not be too large or too small and so on.

3 . Why is the dried coating drums showed varying degrees of orange peel like uneven and irregular ripple ?

Such a situation commonly known as " orange peel ." Causes are: the viscosity of paint when painting is too large or too small ; spraying heavy guns , spraying too thick ( wet- on-wet spraying passes and more ) ; muzzle diameter is too large ; air pressure magnitude unfit ; gun away drums nearly ; quit undercoat layer on the coated surface ; using volatile coating greatly ; adding excess paint driers , etc. , the other is dry and causes.

Control methods are: composite coating between the paint and thinners should be supporting the use ; volatile paint to master painting high temperature and humidity requirements ; strict implementation of the provisions coating process in the method of operation and process parameters ; paint viscosity should be slightly larger , should be smaller high summer temperatures . North-South and seasonal temperature is painting must be carefully considered.

4 . Why sometimes drums coating after drying of the coating is thin , the surface was spotted, local through green ( ie not cover the bottom or open at the end ) , thickness uniformity painted face shape ?

Causes are: small paint viscosity modulation , the added diluent too uneven mixing , resulting in too volatile ; viscosity is very low solids -containing coating , spray nozzle diameter in this case too , the working improper selection pressure , gun parts too far away ; drums outer surface of the untreated water clean, dust dirt and impurities ; painting places such as temperature and humidity cause .

Control methods are: Do not paint coating viscosity modulation is too small , the coating should be filtered before use, Coating asked to supporting the use of paints and thinners ; surface pre-treatment must be done completely free of oil, water , dust impurities, better flatness ; proper grip palm interlayer paint coating characteristics and coating methods ; strict disciplinary process , the implementation process prescribed methods of operation and the coating process parameters ; paint coating areas shall ensure that the requirements of coating temperature , humidity, etc.