The medium to be applied is premetered as a uniform film onto the applicator roll and transferred to the web at the roll nip. The optical web properties, such as smoothness, gloss or opacity, are systematically influenced by the special design of the applicator roll and roll cover. In addition, specific design and calculation techniques of the applicator roll help to ensure a consistent nip in order to guarantee a crease-free flow, to meet the quality demands of the product.
An effective heating and cooling system provides an even temperatur profile in cross machine direction and supports an uniform coating film in machine and cross machine direction.