Device for applying a treatment liquid to a moving web of material, in particular a textile web

A device for applying a treatment liquid to a moving web of material, said device comprising:

• a drum having a rim and a groove, said groove extending around the rim of the drum, said drum rotatable around a horizontal axis;
• at least one guide roller for guiding a fabric web such that the web wraps at least partially around said drum beginning at a side of said drum at which the web is disposed tangentially thereto and continuing around a bottom portion of said drum;
• a trailing, continuous band closed in a liquid-tight manner and circulating in a plane that is perpendicular to the axis of said drum, said band having an outer circumferential surface that fits closely on the fabric web at a location in which the web contacts said drum, said circumferential surface of the band and drum defining a nip therebetween, said band sealing off the nip at its bottom;
• said band having web segments forming lateral sealing elements which extend from edges of the band to project outwardly, said segments having a side abutting a contact surface formed at the rim of the drum by one edge of the groove, said segments extending in a direction perpendicular to the axis of the drum, said segment axially sealing off said nip;
• and
• a feed device for supplying treatment liquid to maintain a predetermined filling level of treatment liquid in said nip,
• wherein in a region near the contact surface, the web segment and the groove are delimited at an angle formed in a plane extending perpendicular to the axis of the drum, the web segment and the groove being tapered to a wedge shape, said taper extending toward a base of the groove.