Strip coating machine with thickness control and method of controlling coating thickness on strip underside

摘要

The continuous strip coating machine has an upper 18 applicator roll, a lower 13 applicator roll, and a backup roll 12 adjacent the upper applicator roll 18. Alternating use of the lift roll 38 changes the pressure between the strip 10 and the roll 13 and thus the thickness of the coating applied to the bottom of the strip. The thickness can be measured indirectly by measuring the pressure of the strip 10 on the roll 13. Thickness can also be measured directly. In addition, the vibration of the strip 10 in the drying oven 14 may be detected and offset. Using feedback control in conjunction with the thickness measurement technique, the angle of the wrap, the relative speed between the roll 13 and strip 10, and / or the transfer roll that delivers the roll 13 and coating material to the roll 13 ( The coating thickness is controlled by varying the nip pressure between 28).