Patch coating die

摘要

A coating die having a shut-off bar positioned to stop the flow of coating material within the flow channel of the die when the shut-off bar is in the closed position. In the closed position, the shut-off bar extends across the material flow channel, blocking flow of coating material therethrough. The shut-off bar moves essentially orthogonal to the direction of material flow. In some embodiments, the flow channel includes a shoulder against which the shut-off bar physically seals, the seal being essentially transverse or orthogonal to the direction of the material flow channel. Coating dies having a shut-off bar are particularly suited for patch coating applications.

主权项

1. A coating die comprising:
a die body having a die inlet for receiving a coating material, a die outlet for delivering the coating material, and a flow channel in fluid communication with said die inlet and said die outlet, said flow channel having a first wall with a passage therethrough and a second solid wall opposite said passage, said flow channel having an upstream necked region, an enlarged region, and a downstream necked region, a shut-off bar positioned to extend into said flow channel proximate a transition from said enlarged region to said downstream necked region; said shut-off bar positioned within said passage in said first wall and moveable from an open position to allow a flow of coating material from said die outlet to a closed position into said flow channel for blocking the flow of coating material from said die outlet, said shut-off bar having an end; and said shut-off bar end, in the closed position, extends into said flow channel without making contact with said second solid wall of said flow channel.