Browse Prior Art Database

Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


An apparatus for measuring, controlling and/or maintaining the capacitance and conductance properties of toner components, comprised of a toner extrusion device, containing therein a blending chamber, a screw mixing means a heating means, a toner supply means, and a sensing device containing two electrodes which generate AC signals for measuring the capacitance and conductance values of the components passing therebetween subsequent to mixing in the extrusion hlendine chamber. Also disclosed is a process for automatically determining the capaci-tance and conductance values of a mixture of toner resin particles and pigment particles which comprises (1) providing a toner extrusion apparatus, (2) adding toner resin particles and pigment particles thereto, (3) mixing the toner resin particles and pigment particles in a chamber situated in the extrusion apparatus, which chamber is maintained at a temperature of from about 5OoC to about 120°C, (4) directing the resulting mixed material between two electrodes situated in a sensing device, whereby the mixture is subjected to an AC signal, (5) followed by converting this signal into useful electronic information which when directed to a pre-programmed computer will control the parameters of the toner extrusion apparatus, and wherein the sensing device is an integral part of the extrusion apparatus.