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Measuring Toner Flow Property

IP.com Disclosure Number: IPCOM000044701D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Crossan, SC: AUTHOR

Abstract

A plot of a toner's time-rate-of-change in bulk density, as the toner sample is vibrated, provides a way in which the flowability of various toner samples can be compared. If the toner is of the type having fumed silica topically applied, this test will also determine if the individual sample contains the proper amount of silica.

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Measuring Toner Flow Property

A plot of a toner's time-rate-of-change in bulk density, as the toner sample is vibrated, provides a way in which the flowability of various toner samples can be compared. If the toner is of the type having fumed silica topically applied, this test will also determine if the individual sample contains the proper amount of silica.

This test is based upon the fact that if the powder is a well-flowing powder, the individual particles will flow past each other, and the powder mass will compact, when the mass is vibrated.

A standard weight (l5 grams) of toner is placed in a glass vial whose sides are calibrated in units of bulk density. The initial bulk density is then read. Since the degree of compaction during vibration is a function of the original degree of compaction, the sample is then aerated by vigorous shaking, as by use of a paint shaker for one minute.

The sample is then placed on a vibrator table, such as the base of a paper jogger. The vibrator is activated for a second or two to provide an initial bulk density reading.

The vibrator is then run continuously, causing the sample to compact, thus causing its bulk density to increase with time. Time and bulk density readings are taken as the level of the toner passes each calibration line on the glass vial.

If desired, the vibration intensity can be increased in steps, each increase occurring when the bulk density no longer changes at the lower level of vibration.

A graph of bulk...