Title: Apparatus for coating a multiple number of layers onto a substrate

Abstract: An improved extrusion-slide coating hopper for multi-layer coating of a substrate is described. The improved extrusion-slide coating hopper includes an upturned generally horizontally directed lip, which lip extends at an obtuse angle from an inclined slide surface and toward the substrate to be coated. A coating composition may be made to flow down the inclined slide and then upon the generally horizontally directed lip before being introduced on top of an extruded bridge of coating composition. The bridge of coating composition spans a generally horizontal gap between the hopper and the upwardly moving substrate. The apparatus of the invention improves upon coating apparatus of the prior art by providing, when coating, increased bridge stability and minimization of the deleterious effects of particles that lodge at an edge of the hopper.

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Inventors: Jackson, Brian W. (London, EN)
Winkler, Dean E. (Rochester, NY, US)
Woodworth, Charles B. (Rochester, NY, US)

Application Number: 588261
Filing Date: 1975-06-19
Publication_date: 1976-12-14
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Class(es): 118/50 118/411
Other Classes:
US Patent Ref:

2761417	Sep, 1956	Russell et al.	118/412.
2975754	Mar, 1961	Wright	118/407.
3627564	Dec, 1971	Mercier	118/412.
3916043	Oct, 1975	Fowble	96/87.

Other Refs:
Primary Examiner: McIntosh, John P.
Assistant Examiner:
Attorney: Lorenzo; A. P.