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AssigneeAlcan Research and Development Limited
InventorsRobert Arthur Innes, Gregory Preston Michael Enright, Garnet Lloyd Derrick
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A coating material such as a high viscosity, low solvent content paint is applied to metal strip by means of a coater which comprises a soft-covered take-up roll which draws coating material from a reservoir and coacts with a hard metering roll (from which excess coating material is continuously removed by a doctor blade), to form a metered film on the surface of the take-up roll. The metered film is transferred to a small diameter hard transfer roll from which it is in turn transferred to a soft covered applicator roll, by which it is applied to the strip. At each line of contact between two rolls or between the applicator roll and the strip the mutually contacting surfaces travel in opposite directions (i.e., the rolls all rotate in the same sense). Preferably the peripheral speed of the applicator roll is greater than that of the transfer roll, which is greater than that of the take-up roll, but the strip speed is preferably lower than that of the applicator roll.
An apparatus for applying a coating material to a metal strip comprising a deformable-covered coating take-up roll, means for supplying a coating material to said roll, a hard metering roll in contact therewith to perform a primary metering function on said coating material on said take-up roll, means for removing coating material from the surface of the metering roll at a position remote from its line of contact with the take-up roll, a hard transfer roll in contact with said take-up roll at a point downstream from the line of contact with said metering roll and a deformable-covered applicator roll in contact with said hard transfer roll, said hard transfer roll being of small diameter and means for rotating all said rolls in the same sense at controllable velocities so that at lines of mutual contact the surfaces of the rolls travel in opposite directions with said hard transfer roll rotating at a peripheral speed greater than that of said take-up roll and said applicator roll rotating at a peripheral speed greater than that of said transfer roll;
A method of applying a film of a coating material to a moving metal strip comprising taking up a continuous film of coating material on a rotating first deformable-covered roll, contacting said first deformable-covered roll with a hard roll having its surface travelling in the opposite direction thereto at the line of contact with said first deformable-covered roll to form a metered film on the surface of said first deformable-covered roll, continuously removing coating material from the surface of said hard roll, contacting the surface of said first deformable-covered roll, carrying said metered film, with a small diameter hard transfer roll having its surface travelling in the opposite direction thereto at the line of contact with said first deformable-covered roll to transfer coating material to said hard transfer roll, contacting said hard transfer roll with a second deformable-covered roll having its surface travelling in the opposite direction thereto at the line of contact with said hard transfer roll to transfer coating material to said second deformable-covered roll, and then transferring said coating material from said second deformable-covered roll to moving strip metal by contacting said second deformable-covered roll with a strip travelling in opposite direction thereto at the line of contact with said second deformable-covered roll, said method including rotating said hard transfer roll at a peripheral speed greater than said first deformable-covered roll, and rotating said second deformable-covered roll at a peripheral speed greater than said transfer roll;
Dependencies are inferred from the claim text.