Abstract: Disclosed is a coating die for coating a web with a solution, wherein the web is conveyed in a predetermined direction so as to run in the vicinity of the coating die; comprising;a body forming the coating die,a coating surface provided on the body at a position close to the running web;a solution chamber provided in the body;a feeding conduit provided in the body, wherein the solution is fed from the outside of the body to the solution chamber through the feeding conduit;a slit provided in the body so as to connect the solution chamber and the coating surface, wherein the solution is fed from the solution chamber to the coating surface through the slit, and then the solution is transferred from the coating surface to the running web;a dry surface provided on the body and positioned upstream of the coating surface in terms of the web-running direction; anda polymer layer formed on at least one of (1) the dry surface, (2) an internal surface of the slit, and (3) internal surfaces of the solution chamber and th

Abstract: The invention provides an apparatus for coating a web which has a first surface having been coated and a second surface opposite to the first surface. A support roll has a supporting surface around which the web is adapted to be conveyed and an air-jetting device for jetting air through the supporting surface onto the first surface of the web so that the web is supported by air without coming into contact with the supporting surface. A coater is disposed to face the supporting surface so as to coat the second surface of the web. The apparatus is provided with a heater for heating air to be jetted by the air-jetting device so that the temperature of the air becomes higher than that of the first surface of the web.

Abstract: A coating apparatus wherein the coating is made by a coater while a support is carried in a non-contacting manner by a gas jetted from a gas jetting device towards the support. The gas jetting device has a hollow housing into which the gas is introduced from a gas source, the wall of the housing adjacent to the support being provided with a plurality of gas jetting nozzle ports through which the gas is jetted towards the support, each gas jetting nozzle port having a throat portion presenting a minimum cross-sectional area inwardly spaced from the outer surface of the wall of the housing and an enlarged outlet portion presenting a comparatively large diameter and opening in surface of the wall. The ratio of port area is adjusted in such a manner that the rate of jetting of the gas from unit area of the outer surface of the gas jetting device becomes smaller as the width of the support is increased.

Abstract: A method and an apparatus in which gas is jetted out of the gas injector 3' to support the support 2 in a contactless manner, while coating solutions are applied onto both sides of the support 2 by means of the coaters 1 and 1'. Supporting static pressure produced in a gap between the support 2 and the injector 3' is made to become 1/10 through 1/1000 of supply pressure of gas fed into the injector 3', and a lift of the support 2 at the contact point with the coating solution from the coater is made to have a value of 20 through 500.mu..