Browse Prior Art Database

SMALL SAMPLE DEVELOPER CONDUCTIVITY MEASUREMENT CELL

IP.com Disclosure Number: IPCOM000027220D
Original Publication Date: 1995-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 96K

Publishing Venue

Xerox Disclosure Journal

Abstract

Conductivity of a xerographic developer is an important variable in determining the performance of two-component xerographic developers. Conductivity measurements can be performed in a Gutman Cell, which consists of a magnetic roller, trim blade, motor drive and a guarded electrode. One disadvantage of the Gutman cell is that it requires about a 50 mL sample of developer, a quantity that is difficult to obtain in some small scale exploratory or experimental engineering investigations. Disclosed is a "Mini cell" that requires only about a 4 mL sample of developer, and which gives results similar to the Gutman cell.

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XEROX DISCLOSURE JOURNAL

SMALL SAMPLE DEVELOPER Proposed Classification CONDUCTIVITY MEASUREMENT U.S. C1.355/251 CELL Int. C1. G03g 15/09 Anthony J. Ruggieri
John T. Bickmore

Conductivity of a xerographic developer is an important variable in determining the performance of two-component xerographic developers. Conductivity measurements can be performed in a Gutman Cell, which consists of a magnetic roller, trim blade, motor drive and a guarded electrode. One disadvantage of the Gutman cell is that it requires about a 50 mL sample of developer, a quantity that is difficult to obtain in some small scale exploratory or experimental engineering investigations. Disclosed is a "Mini cell" that requires only about a 4 mL sample of developer, and which gives results similar to the Gutman cell.

The Mini cell employs two parallel aluminum plates with a guarded electrode located near the center of one plate. The electrode area and spacing are similar to that in the Gutman cell. The aluminum plates are surrounded by DELRINB, which supports the structure, and at the top forms a funnel-like opening for ease in loading developer samples. An optional lid may be added that allows the developer to be repacked by inverting and re-inverting the cell. A circular opening opposite the guarded electrode through the DELRIN@ plastic and partially through the aluminum plate allows a circular magnet to be inserted opposite the electrode. Either a permanent magnet or an electromagnet can be used.

The Mini cell is used in much the same fashion as the Gutman cell. The developer is pou...