Patent ID: 8535763

Claim:
A coating method for applying a coating liquid to both surfaces of a running resin film with a first coating rod and a second coating rod during a manufacturing process of the resin film, and then drying and/or curing the coating liquid in a tenter, wherein the first coating rod placed on an upper-surface side of the resin film is pressed onto and contacts the resin film in a state where the first coating rod is circumscribed and supported by support members each comprising a pair of rollers and spaced with intervals therebetween in a length direction of the first coating rod so that the first coating rod is rotated in a forward direction at a speed substantially equal to a speed of the resin film, the second coating rod being placed on a downstream side of the first coating rod, an upstream side of the tenter, and a lower-surface side of the resin film, the second coating rod supports the lower surface-side of the resin film and controls deflection between the first coating rod and the resin film and is pressed onto and contacts the resin film in a state where the second coating rod is circumscribed and supported by support members each comprising a pair of rollers and spaced with intervals therebetween in a length direction of the second coating rod so that the second coating rod is rotated in the forward direction at the speed substantially equal to the speed of the resin film, and a first coating liquid continuously measured and supplied to an upper surface of the resin film is smoothened by the first coating rod and a second coating liquid excessively supplied to a lower surface of the resin film is measured by the second coating rod, wherein grooves of the first coating rod cooperate to smoothen the first coating liquid and grooves of the second coating rod cooperate to measure the second coating liquid.