Technical question and answer: The grinding method of water-type wood coating

Wood coating professionals know that the quality of coating is good or bad, grinding is a major factor, because polishing throughout the coating process. And polishing not only affects the quality of the problem, it also directly affects the cost of the product, because the proportion of material waste accounted for about 35% of the total material loss. If the method is well managed, it can save at least 5% of the cost
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. It can be seen that no matter as a furniture enterprises or coating workers, should strengthen the importance of polishing.
First of all, we need to know that water-based paint coating can be used hand-grinding and machine-grinding two ways, sandpaper can be divided into wood sandpaper, water sandpaper, iron sand and other materials, sandpaper according to the rough subdivision into a variety of models, and there are cotton sand, cloth and other auxiliary grinding tools. Depending on the characteristics of sanding, the correct sandpaper and sandpaper models need to be selected at different stages of the process to be polished in a skillful manner.
does that grinding do? Grinding in different processes has different meanings, understanding this can be more autonomous to meet the grinding standards.1, white blank grinding
the purpose is mainly to de-foul, find flat, remove the surface burrs, and enhance the adhesion between wood paint and sheet. Generally with the sand grain thick sandpaper (e.g. 180, 240, etc.)
straight wood pattern direction, can not be cross-grinding or irregular grinding, so as not to destroy the wood grain or leave sand marks. Need to pay special attention to the edges, corners, grooves and other bad polishing places, must be polished in place, these places are most prone to coating problems. And white blanks are best not to have a sharp corner design, preferably curved, these places are prone to bad paint, adhesion is not good, paint film easy to fall off the problem. However, it is also important to note that do not destroy the original design, be sure to maintain the original circular or square contours. For example, decorative lines must be kept straight, can not make it bend, break, deformation.2, primer polishing
Here we divide the primer into two categories, with special effects of water-based primer (water-based closed primer, water-based glue solid primer) and the first water-based primer to fill.
special primer, we need to understand the role of primers, such as water-based solid primers are to remove the plate encountered water-based paint after the problem of gluten, burrs. So at this time you can choose 320 to 400 s sandpaper, for bottom grinding, the plate polished smooth and smooth. Water-based closed primers are often used in water-based coatings, which are designed to close the ligand, tingate and grease of the sheet, prevent the paint film from changing color and falling off, and prevent water from seeping into the upper coating. Therefore, the water-resistant closed primer sanding to pay special attention to, should be used 400 to 600 fine sandpaper for light grinding, must not put the paint film sand through, especially in uneven, edge angle places, can be used 600 s cotton sand sanding, to avoid uneven sand through the paint film.
first water-like primer, generally play a filling role, can be used 240 to 320 s sandpaper normal grinding to flat, smooth, sand-free. It should be noted that in the water-open coating process, the paint film is relatively thin, you can choose a finer sandpaper along the wood grain for polishing.
3, the grinding of the intermediate coating
in the water-like coating process will generally have many times the primer or often used to repair, solid color, wipe color, etc. belong to the intermediate coating. Generally will choose 400 to 600 s fine sandpaper for light grinding, in order to remove particles on the paint surface and increase the adhesion between layers, sanding force should be uniform, requiring flat, smooth, no bright spots, no sand marks. In the coating process of antique effect, multiple intermediate layers are used to make rich, three-dimensional color effect. This will use some auxiliary grinding tools, such as cloth, cotton sand, steel velvet and other easy to control the force, through repeated polishing, convenient and better grasp out the light and dark effect.4, finish polishing
the last water-like finish before the polishing, in order to ensure the surface effect of the last finish, so slightly polished, remove particles, smooth surface can be. If it is to do high-gloss effect, the need for paint polishing, generally take water mill, water mill can reduce the abrasive marks, improve the smoothness of the coating, and save sandpaper, labor saving. First with 1000 to 1200 sandpaper grinding highlights, and then with 1500 sandpaper sand inspection.
above is the main process of grinding standards, and in the grinding capital, easy to wear, sand marks, sand leakage, surface is not smooth phenomenon, so in the grinding some precautions and operating techniques need to be noted.
1. In dry grinding will certainly produce a lot of dust, when we need to deal with dust, one can protect the construction environment and the health of employees, so that employees work in a better state; Be sure to clear the ash before spraying, paint spray more need a good dust-free spray room and drying room. Special attention is also needed in the open coating process to prevent dust from entering the wood ducts and brown eyes. And in order to ensure the open effect, will generally use a clean cloth to polish the wood grain, or with a wire brush to deepen the wood grain. So be sure to remove dust from the wood with a harder brush.
2. Sandpaper models should be selected appropriately and cannot be polished or jumped with coarse sandpaper in order to save time.
3. When grinding, the force should be uniform, not available too strong or local excessive grinding. Grinding is usually with four fingers and palms, thumb clamped sandpaper. When polishing furniture with a larger area, you can use blocks of wood or grinding tools.
4. Complex shape of the polishing, to use fine sandpaper light grinding, local can use the thumb or index finger to hold sandpaper can also be folded sandpaper for careful grinding. Fixed heterosexual parts such as the outer arc can be polished with molds (templates that are consistent with the shape of the plate, sandpaper polished on the template).
. If the use of water mill, we must wait completely dry before carrying out follow-up construction, otherwise it is easy to produce whitening phenomenon. In addition, it should be noted that the substrate, which is highly absorbent, is not suitable for water milling.
through the above, it can be seen that grinding in the coating construction is a very important and skillful work. As furniture enterprises should pay attention to staff training, do not think that "grinding the least technical content, polishing work who can do", resulting in the quality of grinding problems frequently occur, affecting the entire product coating quality and cost, because of small loss. To help furniture companies successfully use water-based paint for environmentally friendly coatings, the B.I.G Integrated Green Solutions for Water-based Paints in Burdink place special emphasis on "staff training and coating standards development", which includes training in water-based paint coating and polishing. Training on the construction details, each step of the polishing details, how to improve the efficiency of grinding, will speak very detailed. Help furniture enterprises improve work efficiency, reduce the cost of employment, working hours, energy consumption, accessories and so on.
Furniture enterprises should fundamentally attach importance to the grinding process, recognize its importance to product quality and cost control, and paint companies together to establish a training system, check the standard grinding operation procedures, according to the process to develop a standard and perfect grinding operation process, improve grinding efficiency and quality, to ensure the effect of coating.