Curtain coater for applying a treatment substance on at least on applicator roll

Abstract

A device for applying a treatment substance to a running paper web or board web (11) by means of at least one curtain applicator (2.1, 2.2) comprising a curtain coating die for applying the treatment substance to an applicator roll (6, 7) which, together with a second roll (6, 7), creates a treatment nip (15) in which the treatment substance is transported from the applicator roll (6, 7) to the respective side of the paper web or board web (11), and the curtain coating die has a slot adjustment (3.1, 3.2) for adjusting an exit slot (14.1, 14.2). To provide a device for applying treatment substances which improves the paper/board quality differently prepared treatment substances can be supplied to the at least one curtain coating die, and the curtain applicator (2.1, 2.2) combines the two operating modes of a film operation mode and a sump operation mode by providing an electrically and/or mechanically actuable adjusting device for the slot adjustment (3.1, 3.2) applied to the exit slot (14.1, 14.2) of the curtain coating die, which controls a die lip and sets the exit slot (14.1, 14.2) alternatively to 100 μm to 500 μm for a film operation mode or to 500 μm to 2.0 mm for a sump operation mode, so that the at least one curtain applicator (2.1, 2.2) is designed to be performed with two different operating modes.

Dependencies are inferred from the claim text.