Several solutions for double coating

Due to process requirements, we often encounter requirements for multi-layer coatings, such as coating an additional layer of lignin solution on the separation membrane. What if there is a requirement for precise control of the amount on the basis of the double-layer coating? If you can solve it, what if the double-layer coating must be realized in a wet film state for cross-linking? Do you have a headache?

The wire Bar Coater can prepare multi-layer coating film, provided that the base coat is dry. At this time, it is a better way to use a wire bar to scrape a layer of wet film on the dry base coat film. But sometimes the process is so harsh, how to scrape under the wet film state of the primer? Some technicians thought of using a Spray Gun, but the Spray Gun has no way to accurately control the amount. Because of the grooves of the wire rod, even if it can be scraped, the crest of the thread will scratch the primer material, causing mutual damage. mix. How to do it?

At this time, you can consider using the Wet Film Applicator with the principle of linear scraper. If the thickness is relatively thick, you can consider using an adjustable Film Applicator, because the method of linear scraper will not affect the bottom layer. Is it possible to apply a layer of 50 microns with a scraper (at this time, the scraper should be adjusted to a gap of 100 microns)?

Of course, the reaction of many materials is not something that my chemical cabbage can take into account, but the principle is like this. If you encounter the same problem, you might as well try the north-south tide method?