Process for consecutively coating both sides of web

Claim 1

A process for consecutively coating both sides of a continuously traveilling web, said process comprising: coating a first coating solution onto a first side of a continuously travelling web, to form a first coated layer thereon, supporting said first coated side of said web by a pressurized gas, and supplying a second coating solution to the second side of said web while said first coated side of said travelling web is supported with said pressurized gas, and while said web is still in a non-dry state, the improvement wherein: said step of supplying a second coating solution comprises: supporting a rotatable bar for rotation about its axis at right angles to the direction of web movement and being peripherally grooved in the direction of bar rotation, for rotating contact with said web on said second side, forming a liquid pool of said second coating solution upstream of said moving web and between said rotating bar and a portion of said web supported by said pressurized gas, and rotating said peripherally grooved rotatable bar at a peripheral speed in excess of the velocity of web movement in the same direction as the travelling direction of said web, to pick up a sufficient amount of said coating liquid to cause said second coating solution to flow onto said second side of said travelling web, over the grooved periphery of said rotating bar to insure evenness and the absence of longitudinal streaks of said second coating on said second side of said travelling web.