The yellow areas with cut-out sections for the labels are printed onto the black-painted wheels so that the black labelling appears in negative. The diameter of the printed image is a maximum of 360 mm, the size of the cliché is a maximum of 420 mm x 420 mm. The printing pad moves exclusively in a vertical direction, by means of a freely programmable hollow shaft servo motor with linear axis and a maximum compressive force of 15,000 N. The servo-motor-driven speed variations during absorption from the cliché and transfer onto the wheel allow for optimum ink transmission. Horizontal movement of the cliché and the ink tray is pneumatically-driven. After printing, the inscription is dried with hot air, then removed and transferred to the conveyor belt via a further handling system with special grippers. The labelling system has a cycle time of 6s in a 24h three-shift operation. Alternatively, for the same task, TAMPONCOLOR offers a system solution with a linear conveyor system for the same output quantity, according to customer-specific production conditions.
The costs of labelling can be considerably reduced using the pad printing station. Quality issues caused by incorrectly attached labels are no longer a problem. Pad printing ensures that product labels are resistant, reliable and last the duration of the product’s lifespan.