Generally speaking, sanding has the following functions in coating operations:
①Remove burrs, oil stains and other surface contaminants on the surface of the blank.
②Reduce the roughness of the workpiece surface, remove all kinds of processing marks left on the surface during mechanical or manual processing, and obtain a smooth and even coating surface.
③Enhance the mechanical adhesion of paint.
④For the smooth progress of polishing work.
⑤Eliminate the rough and uneven raised parts of the sealing coating and reduce the paint consumption during the sealing coating.
B. Sanding methods and advantages China Airless Electric Paint Sprayer manufacturers and disadvantages ② Wet sand: generally only used for hand sand. Polish with water, sandpaper, or soapy water. Water milling can reduce sand marks, improve the smoothness of the coating, save sandpaper, save effort, and no dust will be scattered, and will not cause environmental pollution. However, the water-sand work piece must wait for the water-milling layer to be completely dry or dry before applying it, otherwise it will cause the paint film to whiten or delamination. In addition, wood with strong moisture absorption is not suitable for water milling. Water milling is generally suitable for colored paint layers or returning workpieces or workpieces that need to be polished.
Mechanized sanding
① Rely on belt sander or primer sander to sand large area or curved surface through pressing rod or manual pad. We generally call it hand-pressed sand. The sanding surface is flat and smooth. The sand used for hand-pressed sand The model of the belt is determined according to the process flow, please refer to the following table for selection.
②The sanding belt is driven by the rotating roller of the sanding machine, and the flat workpiece is passed above or below the sanding belt by the belt of the sanding machine to realize the sanding of the upper and lower surfaces of a large area.
③Edge sanding machine: Relying on the mold to achieve sanding on the edge of the part or at the line type, it is only suitable for linear flat sanding.
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