Method of controlling thickness of coated film on web-like member by roll coater

摘要

A paint in a paint pan is picked up through a gap hPA formed between a pickup roll and an applicator roll, part of the paint is attached to the applicator roll and delivered to a sheet as a supply flow rate qA. The film thickness coated on the sheet is controlled in accordance with a model equation: M={(qA-qL)x gamma xC}/LS which has evaluated a difference between the supply flow rate qA and a leak flow rate qL not transferred onto the sheet, remaining on the applicator roll and escaping through a gap hAS ( gamma is the specific gravity of the paint, C the concentration of a solid content of the paint and LS a moving speed of the sheet).