CONTROL OF COATING THICKNESS IN SHEET ARTICLE COATERS

摘要

A process of producing an elongated coated strip article (12) having a layer of coating material on each opposite surface (18, 18') of the strip article, in which the ratio of layer thicknesses on opposite sides of the strip article may be set or varied. The process comprises simultaneously applying layers of solidifiable liquid coating materials on the opposite sides of the strip article by advancing the strip article in a direction along a path between opposed coating heads (10, 10'), at least one of which is a floating coating head, having material delivery slots (22, 22') and metering lands (14, 14') for delivery and metering of the liquid coating materials to the opposite surface to form the layers. The ratio of the layer thicknesses may be adjusted when required by varying the path of strip article advance between the floating coating heads to cause changes in angles formed between the strip surfaces and adjacent metering lands on opposite sides of the strip article. The invention also provides apparatus for carrying out the process.