The minimum wet film of 1.5um can be prepared by the coating stick, and the dry film of less than 1um can be obtained after drying. However, due to the influence of many factors on the ultra-thin coating film, actual customers encounter more problems. Today, Beichao will popularize one of the more prominent problems for everyone, and also prevent new users from choosing blindly.
The principle of Mayer-Rod is to use the V-shaped groove formed by the circular section between the steel wire and the steel wire (the principle of extrusion is similar, U-shaped groove), and the fluid is evenly scraped on the surface of the material to be coated through the groove with the same specification. The particle fineness of any material is different, for example, the ink is smaller and the paint is larger. Although laboratory personnel have requirements for film thickness, imagine, if your particle size reaches 50 μm, what kind of film do you think will be scraped out by using a 10 μm wire rod? In the end, the small particles flow out of the groove, and the large particles are scraped away by the wire rod and other materials, leaving obvious scratches, and sometimes even the scratches are uneven due to uneven distribution of particles. Blame the northern and southern tides?
Therefore, when scraping the film, especially the ultra-thin film, it is necessary to control the fineness and fully grind and disperse, so as to prepare a fine film.
The same principle, if the roughness of the material to be coated is relatively large, what do you think will happen? Everyone may wish to think about it.
