The roll coater is a full name roll coater. That is, a device that applies a certain amount of paint to a planar material using more than one set of rotary rolls.
The thickness of the coating can be adjusted by changing the pressure between the two rolls. Typical roll coaters include roll coaters, press roll coaters (grav roll coaters), forward and reverse roll coaters, and the like.
Further, a coater for replacing a coating blade with a small-diameter coating roller is also called a roll coater.