Paint knowledge | what is the importance of sanding process in furniture painting? How to choose sandpaper in grinding process?

Core tip: A: as the saying goes: "10 painters, three in the sand", can be seen in the importance of grinding in the coating operation The grinding process has three main functions: ① for the base material, the burr and oil dirt on the surface of the base material shall be removed; ② for the surface with putty, the surface is generally rough and needs to be sanded to obtain a flat surface, so grinding can reduce the roughness of the workpiece surface; ③ enhance the adhesion of the coating Before spraying the new paint film, it is generally necessary to polish the dry old paint film layer Because the adhesion of the paint on the excessively smooth surface is poor, the mechanical adhesion of the coating can be enhanced after polishing Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: A: as the saying goes: "10 painters, three in the sand", can be seen in the importance of grinding in the coating operation The grinding process has three main functions: ① for the base material, the burr and oil dirt on the surface of the base material shall be removed; ② for the surface with putty, the surface is generally rough and needs to be sanded to obtain a flat surface, so grinding can reduce the roughness of the workpiece surface; ③ enhance the adhesion of the coating Before spraying the new paint film, it is generally necessary to polish the dry old paint film layer Because the adhesion of the paint on the excessively smooth surface is poor, the mechanical adhesion of the coating can be enhanced after polishing There are three grinding methods: dry grinding, wet grinding and mechanical grinding ① Dry grinding: use sandpaper for grinding It is suitable for grinding hard and brittle paint Its disadvantage is that there will be a lot of dust in the process of operation, which will affect the environmental health ② Wet sanding: sanding with water or soapy water Water grinding can reduce grinding marks, improve the smoothness of coating, and save sandpaper and labor But after water grinding, pay attention to spraying the lower layer of paint First, wait until the water grinding layer is completely dry before painting the lower layer of paint, otherwise the paint layer will be white easily In addition, the base material with strong water absorption is not suitable for water grinding ③ Mechanical grinding: in large-scale construction, in order to improve work efficiency, mechanical grinding methods can be used, such as electric grinder (disc type, vibration type) There is also a kind of grinding: the coating requirements indicate that it is "light grinding", for example, after the sealing paint, the old paint film is repainted, local repair, etc., at this time, it should be carried out with fine sandpaper and skilled hands, and the "light grinding" is practical Otherwise, it is the opposite The sanding materials shall be selected in strict accordance with the process requirements Generally, the sandpaper can be selected according to the following rules: 180 × 240 × sandpaper plywood or 220 × 240 × sandpaper leveling primer shall be selected for sanding, 320 × 400 × sandpaper finishing primer or 600 × 800 × sandpaper shall be selected for sanding, 1500 ා - 2000 ා - sandpaper is selected for finishing polishing When sandpaper is used for manual grinding, the whole sandpaper is generally cut into four pieces After each piece is folded in half, the two ends are clamped with thumbs and pinkies In addition, the three fingers are spread on the sandpaper and sanded back and forth on the surface of the object According to the sanding object, change at any time, and use the hole in the finger and the expansion and contraction of the finger to polish in the concave convex area and the corner In large area sanding, it is necessary to master the principle of "taking height as the criterion", turn the sandpaper with the palm of your hand, or attach the rubber such as sponge and cork block with a slightly hard lining, hold the left and right end faces tightly with your thumb and index finger, and level the sanding The length of the sander's nails should be appropriate to avoid injury to the fingers during operation In order to ensure the grinding quality, it is necessary to ensure the training, assessment and management of the grinding workers It is very important to maintain the maximum stability of the grinding team It is believed that "the grinding work is the easiest, no need to teach, no need to care" Or "anyone can polish it" is absolutely wrong A good puttying worker and a good sprayer must be a good sander first, so as to ensure the mutual inspection between processes and the final quality of coatings The home of coatings focuses on coatings, diatom mud, paint coating, coating process, news information and coatings of fireproof coatings, diatom mud, paint coating, coating process, decoration knowledge and decoration effect map of fireproof coatings,