Abstract: An apparatus for dispensing active material. The apparatus oscillating burner, a tank for the active material which is connected to a discharge line, and a fuel reservoir which, via a suction line, feeds the oscillating burner, which operates with pulsating combustion and comprises an oscillating tube. If the pressure drops in the oscillating burner, it is possible to introduce additional fuel thereinto with the aid of a control device as a function of the pulsation pressure of the oscillating burner. The control device causes extra fuel to be supplied to ensure that the resonance range, which has originally been set to no-load, is restored, any pressure loss caused by the feeding of active material being compensated for so as not to affect the resonance behavior of the apparatus, and consequently the quality of the dispensed active material.

Abstract: A device for entering dyes having a consistency, which may vary from a liquid to a pulverous state, into synthetic material processing machines, especially extrusion and injection molding machines, by means of a hose pump adjustable as to the quantity being delivered thereby. The device includes a rotor provided with rollers respectively rotatable about their own axes and about the axis of the rotor in the manner of planetary gears while at least one compressible conveyor hose of elastic material extends in contact with the rollers and between the latter and the interior of a pump housing which interior has a substantially circular cross section. The rollers roll on the hose or hoses while compressing same sectionwise and while the pressure zones circulate about the axis of the rotor. For purposes of adjusting the delivery quantity of the pump per revolution of the rotor, and adjusting device is provided for varying the hose volume respectively remaining between the pressure zones.

Abstract: A filtering arrangement for vacuum loaders, particularly for conveying pulverous materials. The upper part of a filtering container is provided with a cylindrical conveying filter for conveying air withdrawn from the filtering container radially through the conveying filter. A scavenging air filter, for the scavenging air flowing out of the filtering container during the cleaning operation, is arranged above the conveying filter and forms a scavenging air chamber with the inner wall of the filtering container, air flowing axially through the scavenging air chamber.

Abstract: An apparatus for mixing granulated and/or pulverous materials, such as synthetic materials, dye stuffs, and the like. A housing defines a mixing chamber in which is arranged a mixing device. At least a portion of the peripheral area of the mixing device, while forming a gap, borders a surface which is inclined relative to a horizontal plane. The width of the gap is adjusted so that when the mixing device is turned, the material to be mixed is conveyed along the gap against the force of gravity.

Abstract: A mixing device for mixing flowable materials, especially dry materials, such as pulverant or powdered materials, in which a pair of inlet conduits have the downstream ends connected to a fitting which is also connected to the upstream end of a discharge conduit with a valve for selectively controlling the downstream ends of the supply conduits. Separate supply chambers are connected to the upstream ends of the supply conduits and charge a respective material into the associated supply conduit in conformity with the setting of the flap valve.A secondary mixing device is connected to receive mixed material in the discharge conduit for further mixing of the material while air may also be extracted from the material.