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A piece of wood, the surface of the wood should be treated before painting, including surface cleanliness, flattening of defects or surface filling, blanking of white blanks, and filling holes and coloration of transparent paint.
Clean surface
The surface of the wood to be painted must be clean, and all the dirt on the surface of the wood, such as grease, glue, dust, abrasions, etc., and the contents of the wood, such as resin, pigment, etc., should be removed. Grease and grease traces can be cleaned with warm water, hot soapy water, or alkaline water. They can also be wiped off with alcohol, gasoline or other solvents. Dust and abrasive chips can be applied by brushing, sweeping, blowing, etc.
The resin can be removed by solvent dissolution, lye washing or soldering iron.
For light-colored, natural medium- and high-grade transparent paint decoration, the bleaching method should be used to eliminate the stain and uneven color of the wood. Opaque paints or dark transparent paints that do not require high decorative quality can be bleached, bleaching can be carried out on the entire surface of the wood, and more on the surface of the wood with local color depth.
Second, the defect is flat or the surface is filled
White wood surface, often due to the wood itself or mechanical processing, there will be many defects such as annual rings, knots, insect eyes, cracks and partial depressions, nail holes, etc. If left untreated, it will absorb a lot of paint and waste, and To make the coating foundation uneven, the method of treatment is to fill the local defects with putty, or fill it with a thin filling paint.
Third, wood products white sanding
Grinding the surface of the wood with a sandpaper or a sanding belt on a sander, ie white sanding, also known as sanding, is designed to remove surface stains, smooth the surface, and follow the wood wool.
Regardless of the paint decoration used, the final surface paint film should be smooth and smooth. The finish of the surface paint film is accumulated by a number of smooth and smooth coatings and starts from the surface of the white blank wood. Therefore, wood products must be sanded. When sanding, the wood sandpaper number should be selected according to the hardness of the wood. Generally, the number 1 is used, the softwood is 0, and the hardwood is 1 or 2, and the larger the sandpaper is, the thicker the sand is.
Fourth, fill the hole
The surface of the white wood, after fine sanding and removal of the wood wool, is still uneven due to the existence of a large number of pipe holes. After the oil-repellent hole-filling material is applied, the surface of the wood is relatively flat. Only on this basis, the paint is applied. In order to obtain a smoother and smoother paint film. In addition, the hole filling can also prevent the lacquer lacquer, and at the same time, it can properly color and improve the transparency of the wood grain. In actual production, the pipe hole is combined with the wood color.
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