Device for treating a fiber web

摘要

The invention relates to a device for applying treatment substance on at least one surface of the fiber web at a treatment zone (20), which treatment device (30) for applying treatment substance on the at least one surface of the fiber web (W) is provided to apply the treatment substance directly onto the at least one surface of the fiber web (W) or the treatment substance is provided to be applied by the treatment device (30) onto the at least one surface of the fiber web (W) via a rotating roll (51) onto surface of which the treatment device (51) is provided to apply the treatment substance. The treatment device (30) comprises means (31, 32) for providing gas flows (F1, F2) at least at one of the inlet or the outlet opening (15; 35) of the treatment zone (20).