The evaporator includes a guiding means for guiding the material towards at least one opening nozzle.

According to the invention, the nozzle has a nozzle orifice or a nozzle constriction, the open cross section or flow cross section of which is flexible.

A drive (20) generates the opening movement (P) of the injection needle (11).

A drive (20) generates the opening movement (P) of the injection needle (11).

In a suction device (1), a fluid nozzle (12) for jetting a liquid toward a nozzle opening end is provided in a nozzle (11).

An opening movement (P) of the injection needle (11) opens an outlet (12).

An opening movement (P) of the injection needle (11) opens an outlet (12).

The outlet aperture (40) of the nozzle (35) is of a relatively small area, causing the water to shower from the nozzle (35) with a high pressure.

The invention relates to a nozzle element, filter element and/or positioning element with at least one opening (3) serving as a nozzle opening, filter opening or positioning opening, and to a method for producing such an element.

The evaporator includes a guiding means for guiding the material towards at least one opening nozzle.

A needle valve member (40) is positioned in the injector body (30) and is moveable between an open position in which the nozzle outlet (35) is open, and a closed position in which the nozzle outlet (35) is blocked.

In addition, the nozzle opening and closing section, which can open and close the injection portion of the injection nozzle, is disposed so as to prevent the pollutants from being introduced to the inside of the injection nozzle.

Use of a disc of foam material within a nozzle can expand the size of aperture of a nozzle while maintaining delivery of a stable cold plasma.

The second nozzle (44, 46) is arranged at a distance from said opening nip, in the wire travel direction.

A bent slot-shaped nozzle (12) is also provided for producing a corresponding opening jet (11).