Patent ID: 6797321
Filing Date: 2004-09-28
Classification: B05D

Abstract:
A method of forming a coating of a polymer-based paint composition on a moving strip substrate which includes the steps of:(a) pre-heating the substrate to a temperature that is above the glass transition temperature of the polymer of the paint composition; (b) supplying pellets of the paint composition to the surface of the substrate whereby the pellets progressively melt into a liquid state; (c) forming a coating of the liquid paint composition on the substrate surface; and (d) converting the liquid coating into a solid coating of the paint composition, and wherein step (c) of forming the coating of the liquid paint composition includes:(i) positioning a roller transverse to the moving substrate and downstream of where the pellets are supplied to the substrate so that the roller applies pressure to the surface to be coated and thereby controls the thickness of the liquid coating on the substrate; and (ii) controlling the supplying rate of the paint composition on the substrate so that a pool of liquid paint composition is established and maintained immediately upstream of the roller and is contained by the roller and the substrate.