The phenomenon that the sharpness of the coating (smoothness, gloss) is poor, that is, the decoration of the coating is poor. For example, the vivid image of the body coating of today's high-end cars should be 0.8-1.0 (PGD); a little lower should be in the range of 0.6-0.7; ordinary cars, light vehicles and medium-sized trucks with higher decorative requirements should be coated The distinct image of the layer should be around 0.5. If it is lower than the above specified value, it is called poor distinct image.

Reason:

(1) The flatness of the surface to be coated is poor.

(2) The flatness of the selected paint is poor, the gloss is poor and the fineness is not up to standard.

(3) The coating environment is poor, and particles are generated on the surface of the coating.

(4) Poor spraying tools, improper selection of construction viscosity and solvent, poor atomization of paint during spraying, and serious orange peel on the coated surface.

(5) The coating thickness is sufficient and the fullness is poor.

Prevention:

(1) Improve the machining accuracy, prevent bumps during storage and transportation, and ensure that the surface quality of the coated parts meets the technical requirements.

(2) Choose paints with good flatness, fineness and gloss.

(3) To improve the coating environment, the coating of highly decorative coatings should be carried out in a spray booth with air conditioning and dust removal, and the air in the coating drying place (or drying room) should be dust-free.

(4) Use spraying tools and methods with good atomization performance and appropriate construction viscosity to achieve the best atomization of the paint.

(5) Multi-layer coating systems are generally used for highly decorative coatings to increase the thickness of the coating to improve the fullness and smoothness of the coating.