Electricity: measuring and testing – A material property using electrostatic phenomenon
Patent
1995-07-13
1996-12-17
Wieder, Kenneth A.
Electricity: measuring and testing
A material property using electrostatic phenomenon
324454, 324457, 355216, 361214, G01N 2760, G03G 1500
Patent
active
055857302
ABSTRACT:
The present invention is a device for measuring the electric surface charge density on each surface of a sheet. The sheet can either be moving or non-moving. If the sheet is non-moving a pliers-like device having a pair of electrodes aligned opposite with each other is used. The sheet is placed between the electrodes and the surface measurement is made by either one or two electrometers. For a moving web, the apparatus includes a first and second roller each having a charge measurement segment electrically isolated from the roller shell wherein the charge measurement segments periodically engage the web running through the two rollers. Two grounded shields which periodically shield the charge measurement segment are provided. Two electrometers are provided and from this surface charge density measurement and net charge density measurement on the moving sheet are obtained.
REFERENCES:
patent: 3364423 (1968-01-01), Moulton
patent: 3787706 (1974-01-01), De Geest
patent: 3944354 (1976-03-01), Benwood et al.
patent: 4233562 (1980-11-01), Blythe
K. L. Clum and R. J. Pazda, Journal of Electrostatics, 24, Segmented Roller: A Device for Measuring Charge Density on a Moving Conducting Web, 1989, pp. 21-32, month unavailable.
K. L. Clum and R. J. Pazda, Journal of Electrostatics, 28, The Split Segmented Roller: A Device for Measuring Lateral Charge Distribution on a Moving Web, 1992, pp. 39-45, month unavailable.
Clum Kenneth L.
Pazda Robert J.
Bocchetti Mark G.
Do Diep
Eastman Kodak Company
Ruoff Carl F.
Wieder Kenneth A.
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