Abstract: In a suction conveying installation in which different bulk materials are conveyed from respective supply containers to a separator which may serve as a weighing container, the separator is adapted to serve as a mixer and comprises at the bottom at least one ventilation valve to be opened after the end of the separating or weighing operation while the suction fan of the installation is still running, so that air is drawn into the container from the bottom to entrain and mix the materials. Constructional details of the separator including various valve arrangements are described, also certain control arrangements including a pressure monitoring device downstream of the separator.

Abstract: An apparatus for the treatment of synthetic resin powder, such as an epoxy resin or polyester resin powder that forms an excess of powder when used for coating surfaces. The apparatus has a substantially horizontal and cylindrical screen mounted in a housing with an outside discharge for material passing through the screen from its interior and a rotor for rotating inside the screen. The rotor comprises at least two bars spaced and generally parallel with the inside of the screen and is rotatable in the housing on the bearings which are open towards the screen and are connected to a supply of fluid under pressure.