There are several methods of adhesive coating and application of precision coating process.

Brush coating
The use of brushes to apply adhesive in one direction to the bonding surface, the advantage is that it is easy to use, no special equipment is required, can be applied to a variety of complex parts bonding. The disadvantage is that the coating is not uniform and the production efficiency is low.
knife scraping
pours the glue on the bonding surface and passes the plate under the blade, which can be adjusted to control the thickness of the film layer

. The distance between the blade and the surface of the bonded part, i.e. the thickness of the glue layer. Blades can sometimes be machined into jagged, square, etc. The advantage is that the method is simple and the effect is good. The disadvantage is that the coating thickness is uneven and the quality is not stable enough.
roll coating method
use the glue roller to apply the glue evenly to the bonding surface. Its advantages are high, uniform glue layer, easy to operate automation.
spraying method
the use of a variety of paint equipment to spray glue on the bonding surface, the advantage is that the application speed is fast, easy to achieve automation. The disadvantage is that the sprayed glue is harmful to the operator's health.
heat melting method
use hot melt glue to add the gun body to heat the melt, and then squeeze out from the gun head to the bonded table, and then quickly hook up.
coating process is an important processing process to change and improve the surface characteristics of materials, and with the continuous development of science and technology, coating process has become an indispensable and important technical means for the research and development of many important functional materials. In particular, precision coating process technology can meet the special requirements of certain coatings, thereby increasing the added value of the material and expanding its application range. A multi-layer slope flow extrusion coating and curtain coating were typical representatives of precision coating technology. It is the development and application of multi-layer slope flow extrusion coating technology, so that the multi-functional layer structure of color photosynthel materials can be greatly improved in performance and achieve industrial production. It can be said that, without a multi-layer high-speed extrusion coating technology, to achieve up to 10 layers and the total thickness of only about 20 m of color film industrial production is unthinkable. At present, although the photographic photosynthelective materials industry has been declining, but the extrusion coating and curtain coating technology is still in light industrial paper, membrane material processing, packaging materials and other industries have been popularized and applied.
years, the flat panel display industry and some new optical and electronic products, has been rapid development. The coating of these products often requires thinner and more uniform coatings, thus introducing new requirements for precision coating technology. For example, the coating thickness of anti-reflective and anti-glare films used in liquid crystal displays is only a few tens to 100nm, while coatings for new rechargeable lithium battery electrodes require ribbon coating or intermittent block coating. Multi-layer extrusion coating and curtain coating clearly can not fully meet the requirements in this regard. There are a large number of literature reports, strip coating and micro-concave roll coating process in these areas have been widely used. This type of optical film coating has traditionally used vacuum plating, chemical deposition, plasma polymerization and other methods, these methods are under vacuum conditions, solid component gasification evaporation deposited on a specific substrate.
it is difficult to achieve low-cost, high-efficiency volume-to-roll mass production due to the need for vacuum-closed operating environments. Although the use of rotary coating method can also get a uniform thin coating effect, but by the coating area and coating efficiency restrictions, especially the utilization rate of its coating liquid is only about 5%, resulting in huge waste, it is difficult to achieve low-cost industrial production. Therefore, the search for new precision coating technology, to adapt to low-cost, high-quality, large-scale production, to meet the needs of market competition is an inevitable choice. For example, transparent electrode conductive layers in many optical ———,oxides (ITOs) have been used for sputtering. At the end of 2008, Foundel McSer announced the use of wet coating processes to make transparent I TO conductive membranes. The company used its experience in hydrothermal legal preparation of ferrelectrification powder, prepared nano-grade ITO particles, through dispersion to make I TO coating liquid, and then by micro-concave roller coating process ITO coating liquid coating on the PET substrate, after drying to get transparent ITO conductive film. On the other hand, the use of organic conductive polymers, through solution coating means, the formation of transparent conductive film instead of ITO membrane process, has begun to get more and more applications.
basis, this paper will focus on the micro-concave roller coating process and strip coating process in flat panel display, optical electronic products, lithium batteries and other fields of application.
micro-concave version roller coating process
micro-concave version roller coating process technology is Japan's Kangjing Sechemectan Company in the ordinary reverse concave plate roller coating process based on the development of proprietary technology. The basic principles are the same, are a self-measuring method of coating process: by helping the graved roller mesh pattern, the number of lines and depth to determine the amount of liquid, and through some process operating conditions to determine the transfer of coating volume of a coating method.
the biggest difference between micro-concave rollers and ordinary concave roller coating process is "micro". The diameter of the ordinary graved roller is about 125 to 250mm, while the diameter of the micro-concave coat roller is 20mm (300mm coating width) and 50mm (coating width is 1600mm), depending on the coating width. Such a small diameter graved roller is much smaller in contact with the coated substrate when coated. Part of the coating fluid in the groove of the gravate roller during coating is transferred to the coated substrate, while the part remains in the groove of the gravved roller. This creates 2 liquid bridges before and after entering and leaving the coating point. In the case of usually large diameter gravate rollers, it is easy to produce large interference liquid bridges, resulting in coating disadvantages. Especially when the concave roller and press back roller work, the situation is particularly serious, and the micro-concave plate roller coating process because of the small diameter of the concave plate, and there is no pressurized back roller, so the amount of liquid bridge into and out of the coating area is very small, relatively stable, which is conducive to improving the quality of the transfer coating.
.