Modern wood furniture factory, a lot of woodworking, such as drilling, planing wood are replaced by the machine, but the grinding process is still done by hand, different parts and processes need to use a different grinding tools, workers with different tools on the furniture parts Polished. Furniture manufacturers on the furniture before painting the attention of grinding, we can see its importance.
The aesthetics of the furniture surface depends to a large extent on the quality of the grinding quality. We all know that now do paint, whether it is solid wood enterprises or plate furniture business, the largest workload and the number of the most concentrated is the grinding workshop, the problem is the most grinding workshop. That is not too much of the sea tactics. Due to the particularity of the material itself and the differences, as well as the shape of the parts after the shape and shape of the difference is also great, coupled with the sanding equipment, limited processing functions and cost considerations, there is no good to completely replace the manual Sanding approach.
Polishing directly affects the coating effect
1, sand off the substrate on the surface of the burr, floating rust, oil, dust, etc .;
2, to reduce the roughness of the workpiece painted surface, such as scraping the surface of the putty after drying, the general surface roughness is not smooth, need to rely on grinding to get a smooth surface;
3, to enhance the adhesion of the coating. Paint on the smooth surface of the poor adhesion, polished can enhance the mechanical adhesion of the coating.
It can be seen that grinding is one of the important operations to improve the coating effect. In the whole process of painting, not only the white blanks and the bottoming stages need to be polished, but also polished after brush primer and brush finish. It is the paint surface effect and strength is excellent key processes and important protection.
Polished skill
1, reasonable selection of different thickness of the sandpaper: a. Should not be too thick, should not be too much with a model; b. Should not jump sand (referring to the sandpaper model), from 200 # to 600 # or 800 #.
2, polished with wood grain polished, never vertical and horizontal grinding, otherwise it will make wood crack, paint out of furniture will leave a permanent flaw.
3, where the corner of the object grinding, edges and corners can not be sand collapse, the action should be light, be sure to maintain the original round or square contours. Decoration line must be kept straight, can not make it bend, fracture, deformation.
4, polished when the general use of four fingers and palm hold down, thumb sandwich sandpaper. Polished a larger area of furniture, can be pad on the side of the wood grain smooth grinding.
5, while grinding edge brush, sandpaper sand easily fall off, rubbed the surface there is the possibility of grinding wood. In addition, polished dust easily embedded in the eyebrows, therefore, must be polished at any time with a dry brush to brush the dust, while grinding brush until the surface smooth and smooth.
6, the local board bumps scratched, you should first use hot water plus iron, after heating, try to restore the original plane and then sand. Such as the thumb, index finger and the thumb to suppress the sandpaper, only limited to the sand local, not suitable for a large area of sand workpiece, otherwise the whole plane will be rough sand, such as painting can see the phenomenon of concave The.
7, the outer arc and the inner bow plate, in the grinding must use the template (and the plate shape of the same template, the sandpaper on the template polished), such as electric or pneumatic small sander, Should be the shape of the plate polished to prevent sand into a step-like.
Polished method
1, dry grinding:
Sandpaper for sanding. Suitable for hard and brittle paint of the grinding, the drawback is that the operation will produce a lot of dust, affecting environmental health.
2, wet grinding:
Dip with water or dipped in water or soapy water. Water mill can reduce wear marks, improve the smoothness of the coating, and the province of sandpaper, effort.
It should be noted that after the water mill should pay attention to spraying the lower layer, one is to wait until the water mill completely dry before coating the paint, otherwise the paint layer is easy to whitening. Another highly absorbent substrate is not suitable for water mill.
3, mechanical polished:
Large area construction, in order to improve work efficiency, can be used mechanical grinding methods, such as electric grinding machine (disc type, vibration type).
4, light mill:
In addition to the above three kinds of common grinding method, there is a polished that the coating requirements marked "light mill", such as the closure of paint, the old paint and then coated, after the local patch, etc., should use fine sandpaper And skilled, real "light mill". However, it is counterproductive.
The importance of sanding in sanding
Sandpaper selection (1) solid wood white: polished selection of 180 # - 240 # sandpaper
(2) plywood or a polished: use 220 # - 240 # sandpaper
(3) flat grinding of the primer: use 320 # - 400 # sandpaper
(4) the last primer or polished: use 600 # - 800 # sandpaper
(5) finish polished polished: choose 1500 # - 2000 # sandpaper
The use of sandpaper hand-polished use of sandpaper when the whole will be a piece of sandpaper for a total of four, each pair of folding with the thumb and little finger caught at both ends, in addition, the three fingers flat on the sandpaper, back and forth in the object surface sanding.
According to the sanding object, at any time change, the use of fingers in the holes and fingers of the telescopic, in the bumps and edges and corners, motorized grinding.
Large area sanding, the need to grasp the "prevail" principle, the application of palm rotation sandpaper, can also be attached to a slightly hard rubber such as sponge, cork, with the thumb and index finger tightly hold the left and right end, mill.
Sanding nail length to moderate, the operation should avoid injury to the fingers.
The production of sand marks
Reason and solution
(1) cause
The use of too slow dry solvent, resulting in the film can not be dry in a certain time; the upper film is too thin; after grinding is not completely clean, the paint can not penetrate; the use of too much dry sand, Sandpaper when used due to surface retention paint powder, a part of the sand has no sand function will form a moving trace.
(2) the solution
A. Select the most suitable sandpaper, the first sanding with the first sandpaper thicker, the second sanding with the fine sandpaper, and should be the upper sand marks wear off;
B. Grinding should be grained in the direction of wood grain grain direction;
C. Should be polished in the paint after drying, and remove the dust paint powder;
D. Sandpaper after a period of time to check whether to stay powder and be replaced;
E. Adjust the paint viscosity properly and grasp the thickness of the paint spray, enough to cover the sand marks.