Coating apparatus with tangential slide allowing a vertical and fast flow of photographic emulsion
First Claim
1. An apparatus for the application of at least one layer of liquid coating material on a web support comprising a web supporting coating roll over which the web is driven, a coater within a housing having at least one exit slit for liquid coating material and a slide connected to at least one exit slit over which the liquid coating material flows down by gravity to a coating gap terminating at a point adjacent to the roll, and a pressure chamber placed in close proximity to the coating gap between the tip of the slide surface and the coating roll, the improvement wherein the coating gap is located at a point with respect to the coating roll such that the supported web is moving in a downwardly direction at that point and the material to be coated is also moving in a direction that includes a downwardly directed component, the pressure chamber being located above the coating gap, and a plane of the slide surface adjacent to the tip of the slide extends approximately parallel to a tangent to the coating roll at the gap.
1 Assignment
0 Petitions
Accused Products
Abstract
Apparatus for the application of at least one coating layer on a web support comprising a coating roll over which the web is driven, a coater within a housing, e.g., adjustable for rotation around the axis of the coating roll, having at least one exit slit and a slide connected thereto over which the liquid coating material flows down by gravity to a coating gap terminating at a point adjacent to the coating roll and a pressure chamber placed in close proximity to the coating gap between the tip of the slide surface and coating roll, the improvement wherein the coating gap is located at a point with respect to the coating roll such that the web is moving in a downwardly direction at that point and the coating material is also moving in a downwardly direction, the pressure chamber located above the coating gap and a tangent to the slide surface adjacent to the slide tip extends about parallel to a tangent to the coating roll at the coating gap.
17 Citations
18 Claims
- 1. An apparatus for the application of at least one layer of liquid coating material on a web support comprising a web supporting coating roll over which the web is driven, a coater within a housing having at least one exit slit for liquid coating material and a slide connected to at least one exit slit over which the liquid coating material flows down by gravity to a coating gap terminating at a point adjacent to the roll, and a pressure chamber placed in close proximity to the coating gap between the tip of the slide surface and the coating roll, the improvement wherein the coating gap is located at a point with respect to the coating roll such that the supported web is moving in a downwardly direction at that point and the material to be coated is also moving in a direction that includes a downwardly directed component, the pressure chamber being located above the coating gap, and a plane of the slide surface adjacent to the tip of the slide extends approximately parallel to a tangent to the coating roll at the gap.
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18. An apparatus for the application of at least one layer of liquid coating material on a support in the form of a moving web, with a rotating coating roll conducting the support, with a coater having at least one exit slit for liquid coating material and a slide connected to it over which the liquid coating material runs down to a coating slit by gravity, and with a low-pressure chamber connected to the coating slit between the coater and the support to be coated, the improvement wherein the coating slit is situated at a peripheral point of the coating roll having a downwards movement component, that the coater and the low-pressure chamber are placed above the coating slit, that the exit slit and slide are situated on the external side of the coater away from the coating roll, and that the extension of the final section of the slide runs approximately at a tangent to the coating roll at the gap.
Specification