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A METHOD FOR CROSS PRODUCT CARRY OVER TESTING USING A VIBRATING SAMPLE MAGNETOMETER

IP.com Disclosure Number: IPCOM000027161D
Original Publication Date: 1995-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 110K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is a Cross Product Carry Over (CPCO) testing method using a vibrating sample magnetometer (VSM) to qualitatively determine the presence of contamination in a magnetic toner product. Since the VSM measures the magnitude of a magnetic field present in the toner, the proposed method offers time and cost saving improvements over conventional CPCO methods. It applies to the start-up of a toner manufacturing process and is particularly useful after a product change over.

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XEROX DISCLOSURE JOURNAL

A METHOD FOR CROSS PRODUCT CARRY OVER TESTING USING A VIBRATING SAMPLE MAGNETOMETER
Janet L. Mills
Mark J. Smith

Proposed Classification
U.S. C1.430/106.6 Int. C1. G03g 09/083

Proposed is a Cross Product Carry Over (CPCO) testing method using a vibrating sample magnetometer (VSM) to qualitatively determine the presence of contamination in a magnetic toner product. Since the VSM measures the magnitude of a magnetic field present in the toner, the proposed method offers time and cost saving improvements over conventional CPCO methods. It applies to the start-up of a toner manufacturing process and is particularly useful after a product change over.

The proposed method requires two materials: a base toner, and a contaminate. At least one of the two materials must be magnetic. Magnetic saturation (condition in which, after a magnetic field strength measured in electromagnetic units per gram, emdg, becomes sufficiently large, that a further increase in the magnetic field strength produces no additional magnetization in the magnetic material) and the magnetic coercive force (the magnetizing force measured in oersteds, Oe, applied to a magnetic material in a symmetrical, cyclically magnetized fashion to make the flux density vanish) must differ for each material.

The proposed method also requires a knowledge of the magnetic properties and the lot number of the magnetite being used in the process. Given the base toner formulation, a determination can be made on the percentage amount of magnetite present in the magnetic toner. A relationship exists between the saturation point of the magnetite and the amount of magnetite used in the magnetic toner. Furthermore, it is known that the magnetic p...