Nozzle of a Device for Contact - Free Treatment of a Running Fiber Web

Nozzle of a device for contact-free treatment of a running web, comprising:

• a main frame part forming an outer part of the nozzle and having portions which face the web, and wherein the main frame has two longitudinal sides extending in a longitudinal direction across the running web, the main frame having portions forming two side chambers one on each of the two longitudinal sides of the main frame part, each side chamber having at least one a nozzle opening for air to blow towards the fiber web;
• wherein each of the two side chambers have portions forming a first opening facing a corresponding one of the two longitudinal sides of the main frame part;
• wherein the main frame part has an inner upper surface between the two longitudinal sides;
• wherein the main frame defines a U-shaped air channel through which air is lead to the side chambers, the U-shaped air channel located at least partially between the two side chambers and having two downwardly inner side walls joined by the inner upper surface, each side wall having portions forming at least one first opening for leading air into one of the two side chambers;
• a U-shaped inner part located at least partially inside the main frame part in the U-shaped air channel, U-shaped inner part and having two downwardly extending side walls joined by an outer upper surface, each side wall having portions forming at least one second opening for leading air into one of the two side chambers;
• at least one adjustment mechanism between the inner upper surface of the main frame part and the outer upper surface of the U-shaped inner part;
• wherein the at least one adjustment mechanism comprises, a first threaded bushing welding to the main frame part inner surface, a second bushing welded to the U-shaped inner part outer upper surface and a screw connecting the first bushing and the second bushing so that rotation of the screw opens and closes, at least partially, an air passage through at least one of two side chambers first openings and one of the side wall second openings for leading air into at least one of the two side chambers.