Small-scale production of fiber, or powder, containing aerosols

摘要

A screw conveyor and antistatic devices are used to control the rate of addition of the material to the air stream. The material is stored in a vessel with a conical base to lead the material towards a dosing screw (19) which passes the material through a bush (24) to a nozzle (2) into which atmospheric air is led at an air inlet (4). A pipe carries the mixture to an injector (27) activated by compressed air with which it forms the aerosol. The conical base of the storage vessel is ribbed, and the air entering nozzle (2) can be electrically charged, to counter static charges produced within the material. Dosing can be varied by altering the speed of the dosing screw motor or mounting screws with different pitches and thread depths. A swing arm (26), running close to the walls of the storage vessel, is attached to the screw shaft. The equipment is intended for small-scale operation with a material usage between 2 g/h and 10 mg/h.