Based on the requirements of the process, many laboratory technicians need to apply multiple coatings to the coating, such as simulating the primer, middle coat and top coat, to better test the performance of the paint film. The usual Applicator can only coat the film once, and cannot repeat the same area for multiple coatings, the reason is determined by the film coating principle of the Applicator. The control of film thickness is determined by the left and right supporting legs. After you apply it once, you will find that you can’t find the height of a flat surface if you want to apply it for the second time, so you can no longer control the film thickness. A tricky way is to apply cross scraping, once horizontally, once vertically, and take the middle piece, but this can only be applied twice, and the third application will not work.
In contrast, the advantage of wire bar coating is that the film thickness is not fixed by the left and right feet, but all the crests of the threads only control the film thickness of one middle groove. This advantage is that no matter what the width of your coating film is , You can freely coat the flat film layer multiple times.
It can be said that the wire bar coating film based on the Mayer principle does not have so many restrictions on the application range and substrate requirements, and it is easier to apply multi-layer coating films. Although the cleaning is not as convenient as the linear film maker, it is not so troublesome. If I have to say the defect, it is that the general wire rod can only coat a thick film of up to 250um. If it is thicker, it needs to be dried and painted a second time, but the ultra-thin coating Film, high-precision coating film, or leverage!
