Showing papers on "Jet mill published in 1979"

Xerograhic toner manufacture

Abstract: A method of manufacturing xerographic toner to achieve upper and lower particle size classification by first grinding large pellets of toner material in a jet mill. Upper particle size classification is achieved by then passing the ground material to a coarse classifier which operates to return relatively large particles to the jet mill for further grinding, and supplies the finer particles, which are generally no larger than 13 to 15 microns in diameter, to a cyclone separator. In the cyclone separator, the length of the cyclone's exit duct is controlled to achieve lower particle size classification by causing particles below a generally 5 micron diameter size to exit the separator as waste material by way of its upper exit duct. The finished product exits the cyclone by way of the cyclone's lower output port.

Material feed system for jet mills and flash dryers

Abstract: The expenditure of energy required to feed solid material into a jet mill or flash dryer is significantly reduced by the use of a novel feed system in which a blower, operating at a pressure slightly higher than the pressure within the jet mill or flash dryer, produces a stream of air which transports the solid material to be treated. Solid material is introduced into the stream of air through a rotary valve in which the rotary element is disposed for rotation about an axis parallel to the direction of air flow and its blades move through the path of air flow to prevent the accumulation of material on the blades.

Wet cake of polymerization intiator

Abstract: PURPOSE: Titled wet cake which is useful as a polymerization initiator for suspension polymerization and being excellent in storage stability, dispersibility, etc., prepared by mixing water with a finely divided organic azo type polymerization initiator. CONSTITUTION: An azo compound such as 2,2'-azobisisobutyronitrile, 1,1'-azobis (cyclohexane-1-carbonitrile) or 2,2'-azobis(2,4-dimethyl-valeronitrile) is divided into fine particles at least 95% of which has usually a diameter smaller than about 10μ, by the used of a jet mill, a ball mill, a vibration mill or the like. The resulting fine particles are mixed with water to form cake. The moisture-containing wet cake thus produced is a uniform slightly soft solid containing usually 10W20% of water; completely freed from formation of secondary particles; easy in handling such as storage or transportation; has stable uniformity and when thrown into water and stirred, disperses easily into water to form a dispersion of finely divided particles. COPYRIGHT: (C)1981,JPO&Japio

Preparation of resin dispersion

Abstract: PURPOSE:To obtain an aqueous resin dispersion, by pulverizing a solid resin into finely divided powder using a jet mill, and by collectign the resin in a scrubber through which water containing a surfactant is passed.