Comparison of advantages and disadvantages of single-sided coating and double-sided coating
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The coating of the base paper can be divided into single-sided coating and double-sided coating. Single-sided coating is only applied to one side of the base paper, such as single-sided coated paper; double-sided coating is applied to both sides of the base paper, such as double-sided coated paper. Whether it is single-coated paper or double-coated paper, it can be divided into single-layer coating (primary coating) and double-layer coating (second coating). Double-layer coating is used for high quality production. A coated printing paper having a large coating amount. Double coated paper has better suitability than single coated paper and is an effective way to improve the quality of coated paper.
What is the classification of the coater?
The coating operation is divided into an in-machine type and an off-machine type according to the relationship between the coater and the paper machine, and is divided into a single layer coating and a double layer coating according to the number of coating times. The in-machine coating is equipped with a coating machine on the paper machine to continuously carry out papermaking and coating; the external coating is separate from the coating machine and the paper machine, and the coating machine for coating operation mainly has a roller. Three types of coaters, air knife coaters and knife coaters.
What are the characteristics of roll coating?
The roll coater applies a coating to the paper surface by means of a coating roll, and the inner coating is mainly such a coating machine. The amount of coating can be adjusted by the pressure between the metering rolls, the pressure is increased, the throughput of the coating is reduced, and the amount of coating is reduced. The roll double-coated coater has the advantages of simple structure, simultaneous double-sided coating, and an appropriate coating speed as an in-machine coater, and it is difficult to form coating streaks. The disadvantage is that it is difficult to obtain the coating thickness of the air knife coater, and the smoothness and gloss of the knife coater cannot be obtained.
What are the characteristics of air knife coating?
The air knife coater is an air sprayed by pressure to adjust the coating amount and smooth the coating layer, and is referred to as air knife coating. The advantage of air knife coating is that a thick coating amount can be obtained, the coating layer is relatively uniform, and paper breakage is not easy to occur during coating, and is particularly suitable for coating of pressure sensitive coating; however, due to the blade of the coating machine It is an invisible air knife. To make the coating uniform and smooth, the coating is required to have the corresponding concentration and twist. The disadvantage is that the high solid content coating cannot be performed, and the air knife is easily blocked by the local coating of the dry paint, so that the coating is caused. trace.
What are the characteristics of blade coating?
The principle of the knife coater is basically the same as that of the air knife coater. The paint is applied to the paper surface to scrape off the excess paint, and the surface of the coating is smoothed. The difference lies in the steel scraper for the knife coater. Coated and smoothed. The advantage of the knife coater is that the coated surface is very flat and is not affected by the surface condition of the base paper; the coating is not required to be soft and fluid, and high solids coating and high speed coating are possible. The disadvantage is that when the foreign matter is mixed into the coating, it is easy to get stuck in the edge of the knife, leaving long streaks on the paper surface, and the scraping blade is easy to wear, and must be replaced frequently; the coating is generally not too thick, and the thickness uniformity of the base paper is required. It is also stricter.