Drying nozzle
AssigneeBobst Bielefeld GmbH
InventorThomas BOJE
Life of this patent
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Abstract
The invention is about a drying system to be applied on the central drum of a flexographic machine. The dryer is made of two concentric cylinders: the outer one having a slot—or several slots with different thicknesses—the inner one having a slot with a trapezoid shape. By adjusting the relative position of the trapeze and the outer slot sets the effective size of the vent, which determines the air flow coming out of the dryer. This results in a simple and reliable way of configuring the drying of the print.
Claims9
Drying nozzle for gassing a running printing substrate web (30) in a rotary printing machine, comprising a hollow nozzle body (10;
- 10′, 10″), which has a nozzle slot (12) extending transversely to the direction of travel of the printing substrate web (30), characterized in that the nozzle body (10;
- 10′, 10″) has an inner pipe (16) and an outer pipe (14) enclosing the inner pipe, which in their circumferential wall have at least one outlet opening (24, 26), and in that the nozzle slot (12) is formed by an overlapping zone of the outlet openings (24, 26) of the inner pipe and of the outer pipe and it can be adjusted by changing the angular position of the inner pipe relative to the outer pipe.
Drying nozzle according to one of the preceding claims, in which at least one of the two pipes, the inner pipe (16) and the outer pipe (14), has a plurality of separate outlet openings (26), differing in width, distributed over the circumference.
Dependencies are inferred from the claim text.