Dual coating system

A dual coating system that feeds a long substrate including a base substrate having both surfaces on each of which a first coating layer is previously formed so as to be spaced inwardly from both lateral ends of the substrate, and simultaneously forms a second coating layer covering the first coating layer on each surface of the substrate so as to be spaced inwardly from both ends of the base substrate, the system comprising:

• a plurality of guide rollers configured to feed the substrate by a roll-to-roll process;
• a first coater and a second coater spaced apart from each other in a direction of feed of the substrate, and configured to apply a coating solution for forming the second coating layer onto both surfaces of the substrate both surfaces already coated by a first coating layer, the substrate fed by the guide rollers such that the coating solution covers the first coating layers, and both lateral end portions of the base substrate remain uncoated to form uncoated portions;
• a first moving mechanism to move a location of a portion of the substrate to be coated by the first coater along a width of the substrate;
• a second moving mechanism to move a location of a portion of the substrate to be coated by the second coater along the width of the substrate;
• a first edge determiner to determine locations of lateral edges of the first coating layer formed on one surface of the substrate to be coated by the first coater;
• a second edge determiner to determine locations of lateral edges of the first coating layer formed on the other surface of the substrate to be coated by the second coater;
• and
• a controller configured to, when the locations of the lateral edges of the first coating layer determined by the first edge determiner are displaced from reference locations, drive the first moving mechanism to move the substrate along the width of the substrate such that a location of a coated region of one surface of the substrate to be coated with the coating solution is within a predetermined range with respect to the first coating layer, and when the locations of the lateral edges of the first coating layer determined by the second edge determiner are displaced from reference locations, drive the second moving mechanism to move the substrate along the width of the substrate such that a location of a coated region of the other surface of the substrate to be coated with the coating solution is within a predetermined range with respect to the first coating layer.