Patent ID: 6562407
Filing Date: 2003-05-13
Classification: B05C,B05D,C23C

Abstract:
Process for the continuous coating of at least one metal strip (1) with a fluid film (31) of crosslinkable polymer containing no unreactive solvent or diluent and the softening temperature of which is greater than 50Â° C., the said film (31) having a thickness of less than that of the metal strip (1), characterized in that:the metal strip (1) is made to run continuously over at least one back-up roll (3); a sheet (30) of the said crosslinkable polymer is formed, on a roll (20) and by forced flow at a temperature greater than the softening temperature of the crosslinkable polymer, the said polymer being crosslinkable in the melt state and having a viscosity greater than 10 PaÂ·s under the conditions of formation of the said sheet, the temperature of formation of this sheet (30) being lower than the crosslinking onset temperature of the crosslinkable polymer and the said roll (20) being driven in rotation in the opposite direction to the direction in which the metal strip (1) runs; the said film (31) of crosslinkable polymer is formed from the said sheet (30); the film (31) is completely transferred, thicknesswise, onto the metal strip (1); and between the region of formation of the sheet (30) on the roll (20) and the region of application of the film (31) to the metal strip (1), the crosslinkable polymer is thermally conditioned using suitable methods for lowering the viscosity of this crosslinkable polymer to a value less than the said viscosity measured under the conditions of the said forced flow.