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Analysis of Toner Size and Charge Distribution

IP.com Disclosure Number: IPCOM000048306D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Crossan, SC: AUTHOR [+2]

Abstract

Different samples of a xerographic developer mix of toner and carrier are subjected to different low-force toner blow-off cycles, using a Faraday cage and an air pressure jet. For each blow-off cycle, the amount of toner removed, its charge, and the particle-size distribution of the remaining toner are measured.

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Analysis of Toner Size and Charge Distribution

Different samples of a xerographic developer mix of toner and carrier are subjected to different low-force toner blow-off cycles, using a Faraday cage and an air pressure jet. For each blow-off cycle, the amount of toner removed, its charge, and the particle-size distribution of the remaining toner are measured.

A twelve-gram quantity of the toner/carrier mix is divided into four equal parts which are then identified as samples 1, 2, 3 and 4, respectively. Each sample is tested in sequence in a Faraday cage. Each sample is subjected to a different air jet pressure blow-off, for example: sample 1, five psi; sample 2, ten psi; sample 3, fifteen psi; and sample 4, thirty psi.

During blow-off, the quantity and charge of the toner which has been removed are determined.

Each sample is then subjected to particle-size analysis in order to determine the particle-size distribution of the toner which was not removed by the blow-off pressure to which that particular sample was subjected. This is accomplished by placing each sample in a surfactant/ electrolyte solution which is then subjected to ultrasonic agitation, thereby placing all of the toner in suspension.

The suspension is then subjected to particle-size analysis, as by the use of a Coulter counter.

After testing all four samples as above described, a fifth sample is subjected to a single high-pressure blow-off. This high pressure removes all toner from the carrier beads. This procedure produces a measure of the total charge of all toner particl...