US 12,343,949 B2
Nozzle box as well as a stretching unit comprising a corresponding nozzle box
Tobias Häusl, Traunstein (DE)
Assigned to Brückner Maschinenbau GmbH, Siegsdorf (DE)
Filed by Brückner Maschinenbau GmbH, Siegsdorf (DE)
Filed on Jan. 12, 2023, as Appl. No. 18/096,170.
Claims priority of application No. 10 2022 100 704.9 (DE), filed on Jan. 13, 2022.
Prior Publication US 2023/0219309 A1, Jul. 13, 2023
Int. Cl. B29C 55/00 (2006.01); B29C 71/02 (2006.01); B29C 55/02 (2006.01)
CPC B29C 71/02 (2013.01) [B29C 55/02 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A nozzle box, comprising:
side walls spaced apart from each other, a base and a ventilation wall spaced apart from it, thereby forming an interior space,
a plurality of ventilation openings arranged offset to each other is provided in the ventilation wall,
the nozzle box is provided on its ventilation wall with a plurality of protrusions that are raised by at least a height (H) in relation to sections of ventilation wall or top side or surface of the ventilation wall, said sections being situated adjacent to the protrusions,
the ventilation openings are arranged and configured in a region of the protrusions in relation to the top side or surface of the ventilation wall positioned offset to each other in such a way that they are further away in relation to the interior space than the top side or surface of the ventilation openings adjacent to the protrusions,
and
the ventilation wall comprises in a transverse direction of the nozzle box opposing side flanges that overlap the side walls of the nozzle box outside the interior space of the nozzle box,
wherein the protrusions are formed by embossing into the ventilation wall made of a metal sheet,
wherein the ventilation openings or at least a part of the ventilation openings in top view are configured circular or oblong or n-polygonal in shape, and
wherein the protrusions comprising ventilation openings positioned centrally therein comprise a shape in top view that corresponds to the shape of the ventilation openings.