Förbättringar till anordningar med vilka luft injekteras i en för avsvärtning avsedd ström av pappersmassa

摘要

The injector consists of a duct with convergent and divergent sections (2a,2c) and an air inlet chamber (3a). The duct is made from a cylindrical tube (1) with convergent and divergent inner surfaces linked by a cylindrical section (2b), with the air inlet chamber (3a) situated in a step (3) of greater diameter than the convergent section to which it is connected. Just before the point at which it joins the convergent section the step has a tangential aperture (5), and it is closed by a stopper (6) with channels (8) through it for the pulp to be fed through. A number of injectors are enclosed in a sealed housing formed from two plates (10,11) connected by a shell and fed with air through a duct.