Abstract: There is disclosed a selective wetting apparatus comprising a roller rotatable about a roller axis and comprising a wettable roller surface; an applicator unit having a lip which extends parallel to the roller axis and is radially spaced apart from the roller surface by a gap, wherein the applicator unit is to convey liquid agent towards the roller so that the liquid agent forms a liquid bridge over the gap to wet a wetted axial portion of the roller surface; and a flow guide to direct a gas flow into a regulated axial portion of the gap to locally prevent formation of a liquid bridge, and thereby prevent wetting of a corresponding axial portion of the roller surface.

Abstract: In an example, a liquid dispenser is for dispensing liquid into a liquid reservoir with reduced foam formation. The liquid dispenser has a baffle element, guiding element and a discharge element. The baffle element is to receive liquid, the guiding element is to guide liquid from the baffle element to the discharge element, and the discharge element is to discharge liquid into the liquid reservoir. The baffle element, the guiding element and the discharge element are arranged in cascade to flow liquid from the baffle element to the discharge element.

Abstract: There is disclosed a selective wetting apparatus (2) comprising a roller (20) rotatable about a roller axis (24) and comprising a wettable roller surface (22); an applicator unit (10) having a lip (12) which extends parallel to the roller axis (24) and is radially spaced apart from the roller surface (22) by a gap (30), wherein the applicator unit (10) is to convey liquid agent (14) towards the roller (20) so that the liquid agent (14) forms a liquid bridge (32) over the gap (30) to wet a wettable axial portion of the roller surface (22); and a flow guide (50) to direct a gas flow (56) into a regulated axial portion of the gap (30) to locally prevent formation of a liquid bridge (32), and thereby prevent wetting of a corresponding axial portion of the roller surface (22).

Abstract: In an example, a liquid dispenser is for dispensing liquid into a liquid reservoir with reduced foam formation. The liquid dispenser has a baffle element, guiding element and a discharge element. The baffle element is to receive liquid, the guiding element is to guide liquid from the baffle element to the discharge element, and the discharge element is to discharge liquid into the liquid reservoir. The baffle element, the guiding element and the discharge element are arranged in cascade to flow liquid from the baffle element to the discharge element.