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This is a method of combining multiple types of rollers together to obtain an ideal coating surface for coating a flat coating material (substrate). Adopting a roller coating system, through various process combinations and refinements, it is suitable for various viscosities of the coating liquid and the thickness of the coating film. In this way, the coating machine can be applied to industries such as electronic materials, optical/liquid crystal products, food, medicine, etc.
The coating machine is usually only used for relatively thin flat coating purposes such as thin films and plates. For wider and longer substrates (coated materials), continuous high-speed coating can also be carried out. Mainly used for "wet coating", a dust-free room is also used for protection after coating and before curing to prevent foreign objects from adhering to the coating surface. According to the state of the pre coating liquid, the measurement and determination of the pre or post coating amount, the working mode of the roller coating machine can be classified. There are also many methods that combine painting and installation. Only representative painting and mounting methods are listed here for explanation. This is a type of coating head typically equipped with a liquid tank or pool, which exposes the coating solution to the atmosphere of the coating method. Representative methods include "carving wheel coating" and "reverse coating". Immerse the carving roller into the liquid tank. Through carving processing, the surface of the carving roller forms a concave convex shape. The coating machine uses a scraper to scrape off the coating liquid attached to the carving roller, and applies the accumulated coating liquid in the concave area on the mesh roller of the coating material (substrate). When changing the thickness of the film, it is necessary to change the shape of the engraving roller. In addition, the offset printing wheel coating machine can obtain a smooth and uniform coating surface at high speed. Usually composed of coating roller, carrier roller (rear wheel rubber), and metering roller. Transfer the coating liquid to the substrate mesh roller by rotating the support roller and coating roller in the same direction. Because the thickness of the coating depends on the gap between the coating roller and the measuring roller, as well as the speed of the roller, attention should be paid to the accuracy of the rotational vibration and gap caused by poor assembly of the roller. This is a coating method that does not allow the coating liquid to be exposed to the atmosphere before formal coating. Therefore, based on the properties of the coating solution, it is more convenient to maintain the coating quality. Equipment such as "slit mold coating machine" and "lip coating machine" are all used in this way. Mold coating "is a coating technology that uses plastic film extrusion molding technology. By allowing the coating liquid to pass through the "mold" to produce a uniform liquid film, the liquid film is then brought into contact with the coating substrate. In this way, the coating liquid sealed in the container is supplied to the "mold" through pressure, so the coating liquid is not affected by air and can achieve stable coating.
The "slit mode coating machine" is a representative mode coating machine that uses a mold design to evenly distribute the coating liquid horizontally. By creating defects between the top of the mold called the "mold lip" and the support roller, the coating is made smooth.
In recent years, with the advanced development of multi-layer simultaneous coating devices such as "multi-layer seam molds", efficient coating has become possible. Lip coating machine "is a coating machine that facilitates quality control by digitally controlling the coating head. The coating liquid is supplied from the "bottom groove" section located below the lip shaped nozzle to the "top groove" located at the top of the lip shaped nozzle to contact the moving substrate. The top of the mold lip is R-shaped and coated by creating a fault between it and the base.