Abstract A method and apparatus for coating thixotropic high viscosity liquid coating compositions on a moving web at a narrow coating in such a manner as to provide a flat coating surface. The apparatus is provided with at least two liquid discharge ports arranged side by side opposite to the moving web so that the liquids are discharged through the ports and the edge of the coating liquid streams meet on the web. The apparatus is further provided with an extrusion type hopper having two slide members of which the tip ends are in the form of a knife edge, the slide members being arranged so that the knife edges are directed inwardly toward each other, at least one partition plate interposed between the slide members so as to equally divide the distance between the internal surfaces of the slide members. The method of this invention is well suited for use in applying a magnetic recording stripe to a motion picture film.
A method for coating a thixotropic high viscosity liquid coating composition on a travelling web at a narrow width through an extrusion type hopper, comprising discharging the coating liquid from the hopper onto the travelling web through at least two coating liquid discharge ports arranged side by side in the direction of the width of the web so that the adjacent edges of the coating liquid discharge meet on the web, and drying the coated liquid within such time that a substantially flat cross sectional area results.
Claim 2
Independent Claim
87 words
A method for coating a thixotropic high viscosity liquid coating composition on a travelling web at a narrow width through an extrusion type hopper, comprising discharging the coating liquid from the hopper onto the travelling web through at least two coating liquid discharge ports arranged side by side in the direction of the width of the web so that the adjacent edges of the coating liquid discharge meet on the web, and drying the coated liquid within such time that a substantially flat cross sectional area results.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein said travelling web is photographic film and said coating composition comprises a magnetic recording layer coating composition.
Claim 4
Dependent Claim
19 words
The method of claim 1, wherein the viscosity of the coating layer ranges from about 100 to 8000 cp.