The coating of base paper can be divided into single-sided coating and double-sided coating. Single-sided coating is to coat only one side of the base paper, such as single-sided coated paper; double-sided coating is to coat both sides of the base paper, such as double-sided coated paper. Both single-sided coated paper and double-sided coated paper can be divided into single-layer coating (primary coating) and double-layer coating (secondary coating). Double-layer coating is mostly used to produce high quality requirements 2. Coated printing paper with large coating amount. Double-layer coated paper has better printability than single-layer coated paper, and is an effective method to improve the quality of coated paper.
What are the classification of coating machine?
The coating operation is divided into in-machine type and out-machine type according to the relationship between the coating machine and the paper machine, and is divided into single-layer coating and double-layer coating according to the number of coating. In-machine coating is to install a coating machine on the paper machine, so that papermaking and coating are carried out continuously; out-of-machine coating is that the coating machine and the paper machine are independent of each other. Three types of coating machine, air knife coating machine and blade coating machine.
What are the characteristics of roll coating?
The roll coater applies paint to the paper surface with a coating roll, and such coaters are mainly used for in-machine coating. The amount of coating can be adjusted by the pressure between the metering rollers, the pressure is strengthened, the throughput of the coating is reduced, and the amount of coating is also reduced. The advantage of the roll-type double-sided coating machine is that it has a simple structure and can perform double-sided coating at the same time. As an in-machine coating machine, it has a more suitable coating speed and is not easy to generate coating streaks. The disadvantage is that it is difficult to obtain the coating thickness of the air knife coater, nor the smoothness and gloss like the blade coater.
What are the characteristics of air knife coating?
The air knife coater uses the air ejected by pressure to adjust the coating amount and smooth the coating layer, which is simply called air knife coating. The advantage of air knife coating is that it can obtain a thick coating amount, the coating layer is relatively uniform, and it is not easy to break the paper during coating. It is particularly suitable for the coating of pressure-sensitive coatings; but due to the blade of this coating machine It is an invisible air knife. To make the coating uniform and smooth, it requires the coating to have a corresponding concentration and degree. The disadvantage is that it cannot be coated with high solid content, and the air knife is susceptible to partial clogging of dry paint, causing the coating trace.
What are the characteristics of doctor blade coating?
The principle of the blade coating machine is basically the same as that of the air knife coating machine. After the paint is applied to the paper surface, the excess paint is scraped off, and the coating surface is smoothed at the same time. The difference is that the steel blade of the blade coater is used. Coating and scraping. The advantage of the blade coating machine is that the coating surface is very smooth and is not affected by the surface state of the base paper; the coating is not required to be soft and strong in fluidity, and can be coated with high solid content and coated at high speed. The disadvantage is that when debris is mixed into the paint, it is easy to get stuck in the knife edge, leaving long streaks on the paper surface, and the blade is easy to wear and must be replaced frequently; the coating is generally not too thick, which requires uniform thickness Also strict.
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