What are the types and features of coating machines?
Release date:
2020-12-23
Coating operations are classified into in-machine and off-machine types, depending on the relationship between the coating machine and the papermaking machine. They are also divided into single-layer and double-layer coating processes based on the number of coating applications. In the in-machine method, a coating unit is integrated directly into the papermaking machine, allowing continuous paper production and coating without interruptions. In contrast, the off-machine approach involves separate coating and papermaking machines. The primary types of coating machines used for off-machine operations include roll coaters, air-knife coaters, and blade coaters. Among these, the roll coater applies coating material to the paper surface using a coated roller, making it the most commonly used type in in-machine coating systems. The amount of coating applied can be precisely adjusted by controlling the pressure between the metering rollers—increasing the pressure reduces the flow of coating material, thereby decreasing the coating thickness.
Coating operations are classified into in-machine and off-machine types based on their relationship with the paper machine, and into single-layer and double-layer coating processes depending on the number of coating passes. In-machine coating involves integrating a coating unit directly onto the paper machine, enabling continuous production from papermaking to coating. Off-machine coating, on the other hand, uses a separate coating machine that operates independently of the paper machine. The main types of coating machines used for off-machine operations include roll coaters, air-knife coaters, and blade coaters.
Roller coating machines apply coating onto the paper surface using a coating roller, and in-machine coating processes primarily rely on these types of machines. The amount of coating applied can be precisely adjusted by controlling the pressure between the metering rollers—increasing the pressure reduces the flow of coating, thereby decreasing the coating thickness.
The advantages of a roller-type, double-sided coating machine include its simple structure, the ability to simultaneously stop coating on both sides, and its relatively suitable coating speed when used as an in-line coater—plus, it’s less likely to produce coating streaks. However, a key limitation is that it’s difficult to achieve the precise coating thickness attainable with air-knife coaters, nor can it deliver the same level of smoothness and gloss as blade-coated surfaces.
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