Analysis of common wood lacquer disease: paint film cracking.

Paint film cracking, refers to the paint film because of a variety of reasons cracked, and the cause, there may be the following situations:
1, one-time brush too thick
And the table dry too fast, it is easy to lead to paint film surface shrink too fast, surface dry contraction is easy to crack.
2, human-caused paint cracking
strictly speaking, is related to improper construction, resulting in the wood substrate itself cracking

. Problems are common in furniture assembly, such as lying solid wood skins on trides. On both sides, it is easy to say that the border part is prone to problems, the standard practice of sticking wooden bars in this location is to hit the white glue first, and then hit a shot with an air gun, after drying out there is no problem.
However, there are now individual workers lazy, for the border part of the treatment is not white glue, or just symbolic hit a few places, the border part of the wood bar and trid board between the equivalent of living, a long time will certainly crack, which is typical of artificial lazy caused by cracking.
3, the water content of the substrate is high
the water content of the substrate is too high caused by cracking, generally due to the wood substrate moisture content from high to low in the process of transformation caused by cracking. This kind of problem is common in the south of the wood (water content is generally 20%) pulled to the north to use, because of the dryness of the northern sky, not long after the water content of wood will be reduced to zero, all dry, dry on the crack, and not very good remediation. Select wood construction, the best moisture content range value in 8% to 12% is best, too wet or too dry is not good.
4, the temperature difference between day and night is too large
when the temperature is high, the paint film dry speed is fast, the temperature is low, the paint film dry speed is slow.
when the temperature difference is large, paint film a cold and hot by a thousand hammers, paint film on the pick and choose not dry, to crack the way to demonstrate.
5, paint
the quality of paint is not bad, lack of stretch. If you choose some big brands of water-like wood paint, the general problem will not be too big.
6, carpentry selected to repair putty improper
carpentry to steal materials, in order to save trouble, with scraping the wall of putty, water directly fill the seams of wood, although putty can fill, but no stretch, for cracking buried hidden dangers.
if you want to fill the seams, the formal construction process is to choose two parts of the seam king. The role of the seam king has two, one is filling, one is bonding, it has a certain elasticity. Therefore, if there are holes in the surface of the wood substrate, ordinary putty hook a little closed agent can also be, and the seam king not only easily cope with the seams, play a bonding role, but also can fill the hole.
7, the temperature is too low, the humidity is too big
if the temperature is too low, the humidity is too large, will directly lead to the paint can not be filmed, paint film film film once poor, cracking is inevitable.
8, density plate did not do a good job of
why not do a good job of closure agent, will lead to cracking? Because the density plate process is formed by pressing, very absorbent. Get some water on the density board and you'll suck it straight in, and it'll swell. If the white primer is sprayed directly on the density plate, the density plate absorbs the moisture directly from the white primer, which is used to help the paint form a paint film to ensure its extension and stretchability.
Under normal circumstances, after the formation of the paint film, this part of the water will be evaporated outwards, but now to undertake this part of the function of the water is absorbed, the substrate surface only left some filling ingredients in the white primer, and even the emulsion will be absorbed by the density plate part, the paint film formation will naturally be greatly affected, so the paint film will crack open. On the other way, if a layer of sealant can be sprayed before painting, it can effectively avoid the problem, because the principle of the closed agent is permeable film formation, can form a barrier between the wood substrate and the next paint.
, what about cracked paint films? It can be recommended to use 320 purpose sandpaper to remove the problem paint film and redo it, and then in accordance with the construction order of one bottom and two sides can be carried out.
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