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During the working process of the coating machine, it will mainly follow two working processes:
1. Thickness setting process of counter-rotating rollers
2. Reverse roller coating handling process
Coating machine reverse roll coating and its coating window: In the pole piece cloth machine, the slurry coating on the coating roll is transported to the copper foil wrapped on the back roll in the opposite direction of the change direction in the blank area of the bright roll or on aluminum foil. Therefore, its coating process must also meet the rules of reverse roll coating. In the process of reverse roller coating, if the gap between the two rollers is relatively small and the capillary number is low enough, that is, when the viscosity or speed is relatively small, the flow within a relatively wide speed ratio plan is relatively stable. Can get better coating apparent quality. If the gap is relatively large, air entrapment is prone to occur when the coating speed is high, and there are many fine air bubbles on the coating surface. Sometimes in order to increase the output value, if the coating speed is increased, there may be air entrapment damage. In order to eliminate this damage, the operation method of reducing the gap is adopted. If the gap is too small, the coating roller and the backing roller will knead each other, which will additionally increase the load on the motor and reducer, resulting in abnormal wear and tear. This is also one of the reasons why the slurry is limited in the speed of conveying and coating on the reverse roller.
Forward roll coating and its coating window: first introduce the term in coating technology - coating window, any coating method (method) has an applicable plan, which can carry out harmless coating under certain operating conditions (plan) Coating, that is, uniformly coating a thin layer of fluid onto the support, the plan of this coating operation is called the coating window in coating technology. In the coating machine, it is controlled by adjusting the metering space between two coating rollers and the metering rollers in the same direction of rotation in the coating of the counter-rotating roller, and the required thickness of the coating formed on the coating roller is controlled. The coating method is a special method of counter-rotating rollers, that is, one of the metering rollers does not change, that is, the speed is zero, and the cross-section of the metering roller is made into a comma shape, also called a comma scraper. The coating thickness can be adjusted by changing the distance between the comma scraper and the coating roller. In this special counter-rotating roller coating method, if the operation is improper, the position of the knife edge deviates from the working position, and the coating parameters and slurry parameters are not within a certain plan, there may be vertical streaks, which are called vertical streaks.
