Solid wood furniture is coated with paint paint when the substrate treatment basic work

White blank requirement: Wood moisture content does not exceed 20%.
polishing treatment: sandpaper to polish the wood until the surface is smooth and smooth. Sandpaper should be used from small to large in turn, the larger the number of sandpaper items, the more delicate the polishing effect. The more delicate and smooth the wood surface, the better the effect of wood wax oil, but also more water-saving wood wax oil.
we can choose 100-320-# according to the degree of wood wool, grinding back and forth along the wood texture until smooth and removing surface dust.
1. Old wood renovation:
For this type of wood we can choose 100- 180 s sandpaper down the wood texture, wood surface residual paint must be all polished clean before wood wax oil brushing.
2. New wood brushing:
For unused or painted wood, we can choose to use 180- 320 s sandpaper to polish along the wood texture, this kind of wood surface looks smooth, but the burrs produced during the cutting process still need to be polished clean to be painted with wood wax oil.
filling treatment: the nail eye, scar hole eye with transparent or the same color putty patch to flat.
cleaning treatment: clean, dry, grease-free and dusty surfaces before painting.
fact, the pre-painting substrate should be flat clean and free of defects, uniform color, no resin and so on. Common substrate treatment before coating includes: decontamination, degreasing, decoloring, greasing, sanding, dewood hair, filling tube holes, coloring and so on.
, de-fouling
wood products parts in the mechanical processing process, its surface will inevitably be left grease, glue, dust, powder and dirt. These greases and glues will seriously affect the uniformity (or inability to color) of the coating and the curing and adhesion of the coating, dust, etc. will affect the clear appearance and coating effect of the transparent coated wood grain.
surface grease and glue cleaning can be used warm water, hot soapy water or alkaline water cleaning, you can also use alcohol and other solvents to wipe off, pay attention to cleaning with clean water wash side, dry after sandpaper smooth grinding.
surface dust can be blown with compressed air, chicken hair dust or brushed with a brush, it is best not to use a damp cloth to wipe, so as not to get dust between the wood, the surface becomes gray and shiny.
2, degreasing
conifer wood containing resin must be removed before painting, resin containing oil-saving oil and other components will cause oily paint curing, dyeing is not equal and reduce the adhesion of the paint film, can be removed by the following methods.
1, solvent dissolution
more local pine resin, can be wiped with a cloth on the solvent, pine fat area, the solvent can be immersed in sawdust on top of repeated wipe, improve room temperature or heating parts degreasing effect is better. However, this method is expensive, the solvent is toxic and easy to catch fire, the safety risk is big.
2, lye washing
lye washing, with grass brush (do not use plate brush, etc.) to apply lye to the pine resin, 3 to 4 hours later with hot water will be 2% carbonate solution for cleaning, must be completely cleaned, otherwise there will be alkali pollution (the surface color darkened), therefore, not suitable for light color or color decoration.
3, lacquer film closed
the surface degreasing after the depth of the resin may also seep out, must be closed, early commonly used insect glue paint, modern multi-use polyurethane primer.
4, digging
for the constant oozing of pine resin insect eyes and other defects, take dig to make up for grease, digging to pay attention to the direction of fiber and glue tight.
three, decoloring
decoloring purpose is to make products or parts of the material color uniform, eliminate color spots, etc. , the application of more bleach is: hydrogen peroxide, oxalic acid, ammonia and so on. In addition, wood surfaces that have been contaminated with various types of pollution, such as iron pollution, acid pollution, alkali pollution, etc. can also be decolored. Decoloring treatment should pay attention to the following points:
1, bleach is only effective during wetting, should not be heated treatment;
2, bleaching plywood parts, to avoid excessive bleach flow to the end of the head leading to cracking;
3, bleaching after easy to pick up wood hair, drying, need to polish;
4, more wood, in advance with 5% to 10% sodium carbonate solution treatment, the effect is better.
4, greasy flat
natural materials due to their own and mechanical processing problems, there are many defects, if not treated, will absorb a lot of paint caused waste, but also make the coating foundation uneven. Therefore, before the coating commonly used thick Nizi to fill local defects, for transparent and opaque coating is an indispensable process. Of course, there is no need to do without defects.
, sand
any grade of wood furniture products the final surface coating requires smooth and smooth, this effect needs to start from the white blank coating accumulation. For a smooth coating effect, grinding sanding is the best and labor-saving method.
substrate sanding is generally smooth, according to the relevant data research, the pre-substrate sanding requirements substrate roughness of less than 30 microns, transparent coating should be less than 16 microns.
6, go wood hair
wood wool is the surface of fine wood fibers, usually may be dumped on the wood surface or tube holes, only polishing can not completely remove wood hair, once the surface is moist, wood wool will be erected to make the surface rough uneven, and wood hair around a large amount of fuel solution, so that uneven coloring.
way to get woody is to take first moist, then dry, and then sand. Modern coating often use low-solid content, low-viscosity polyurethane closed primer (under the base of the treasure) coated wood surface, paint-containing wood hair moisture absorption is relatively hard and brittle easy to polish, grinding is not available too much force, otherwise new wood hair will be produced.
flat or molded part surface can also be hot-rolled to treat wood hair, through the roller hot-rolled surface dense, smooth, wood wool will no longer be erected, coating can also save the amount of paint.
, fill the pipe hole
first note obvious hole coating (full open, semi-open) does not fill the hole treatment. Wood is a porous structure, especially on the surface of broad-leaved materials, which are filled with a special filler before coating to obtain a rich, shiny surface paint film.
After filling the hole drying is very important, not closely placed but should be well ventilated drying, fully dry after painting, otherwise there may be residual solvents in the tube hole, after a period of time, may become whitening caused by the painting defects.
, coloring,
is to make the appearance of furniture a certain color operation. The appearance color of wood furniture is the primary factor of its decorative quality and decorative effect, because the first impression of people buying furniture is the appearance color, therefore, the appearance color is very important to the commodity and use value of wood furniture.
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