Optics: measuring and testing – By monitoring of webs or thread
Patent
1991-03-22
1993-09-07
Rosenberger, Richard A.
Optics: measuring and testing
By monitoring of webs or thread
250571, G01N 2186
Patent
active
052434079
ABSTRACT:
A device for characterizing the formation of a sheet material is described. The device comprises a formation sensor for measuring the basis weight of the sheet material as the material passes through the sensor, and signal processing circuitry which receives a basis weight signal from the formation sensor and which produces three types of outputs, which outputs characterize: (1) the magnitude of variation in the sheet basis weight; (2) the strength of the weakest portion or portions of the sheet; and (3) the size of the flocs comprising the sheet. The formation sensor includes a light pipe that is held against the sheet as the sheet moves through the sensor, and that directs a small spot of light transmitted through the sheet to a light detecting device. The magnitude of small-scale variation in the sheet basis weight is computed by determining the ratio between average value of the basis weight signal and the varying or AC component of the basis weight signal.
REFERENCES:
patent: 3114791 (1963-12-01), Zabell
patent: 3135819 (1964-06-01), Quinn
patent: 3228282 (1966-01-01), Barker
patent: 3325649 (1967-06-01), Bird
patent: 3458261 (1969-07-01), Bentley
patent: 3469104 (1969-09-01), Hector
patent: 3525871 (1970-08-01), Lehtinen
patent: 3824021 (1974-07-01), Axelrod et al.
patent: 3900265 (1975-08-01), Merlen
patent: 4019066 (1977-04-01), Lucas et al.
patent: 4288160 (1981-09-01), Lodzinski
patent: 4453404 (1984-06-01), Powell
patent: 4455090 (1984-06-01), Roberts
patent: 4644174 (1987-02-01), Ouellette et al.
patent: 4648712 (1987-03-01), Brenholdt
patent: 4767935 (1988-08-01), Anderson et al.
patent: 4770538 (1988-09-01), Orkosalo
Article entitled "Specific Perimeter-A Graininess Parameter For Formation And Print-Mottle Textures" by Jordan et al. Pulp and Paper Research Institute of Canada, Jul. 1984.
Norman and Wahren Article entitled "Using a beta radiographic method", Svensk paper stidning No. 11 (1974) no month. pp. 397-406.
Norman and Wahren article entitled "Mass Distribution and Sheet Properties of Paper" Transactions of the Symposium held at Cambridge: Sep. 1973, pp. 7-73.
Undated M/K Systems Inc. advertisement.
Sep. 19, 1986 Pulp and Paper Monthly article re the Lippke formation sensor.
Anderson Leonard M.
Chase Lee M.
King Harriss
Measurex Corporation
Rosenberger Richard A.
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