Abstract The invention consists of an apparatus and process for applying a coating to a woven or nonwoven web. The apparatus is comprised of a casting box for holding a coating material, an arrangement of slotted, rotating and nonrotating tubes for supplying a moving stream of coating composition into a pressure balancing zone above the web, a means for supplying the coating composition to the tubes, and a doctor blade suitably disposed above the web to achieve a coating of uniform thickness. In the process, the movement of the coating composition relative to the web is in the form of periodically recurring, parallel lines, intersecting the center axis of the web at a constant angle of 0*< Alpha <90*. By utilizing the apparatus and process disclosed herein, a uniform coating, free of color bands or strips, can be achieved.
Apparatus in accordance with claim 1 comprising in addition: a. cover plate means engaging the upper edges of said casting box means; b. a source of pressurized inert gas; and c. means for conveying said gas into said casting box means at a point above the surface of the coating composition contained in said casting box.
Claim 2
Dependent Claim
70 words
Apparatus in accordance with claim 1 wherein said means for conveying said coating composition from said container to said cylindrical inner space comprises in addition: a. pipe means communicating with said container; b. annular channel means disposed in said first tube means and communicating with said pipe means; and c. slotted openings disposed in said second tube means and communicating with said annular channel means and said cylindrical inner space.