| 摘要 |
Coating apparatus for carrying out a process of coating in which one or more layers of coating composition are applied to the surface of an object, such as a continuous web or discrete sections of sheet material, by advancing the object through a coating zone in which a flow of coating composition is applied thereto, for example, bead coating or curtain coating apparatus, is provided with a shield to protect the flow of coating composition against disturbance by ambient air currents. The shield is formed of a foraminous material, such as screening or perforated plate material, which functions to diffuse air currents impinging thereon so that their velocity is decreased, with a resulting decrease in their ability to disturb the flow of coating composition. Particular advantage is achieved in using the shield in processes for coating photographic materials, especially in high speed curtain coating operations involving a substantial height of free fall, and in bead coating operations employing a slide hopper where ambient air currents give rise to a problem of differential evaporation of coating composition on the slide surface.
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