Method and apparatus for measuring color of a moving web

Details Method and apparatus for measuring color of a moving web Method and apparatus for measuring color of a moving web

2011-06-14

2011-06-14

Evans, F. L (Department: 2877)

Optics: measuring and testing

By shade or color

C356S073000, C356S429000

Reexamination Certificate

active

07961319

ABSTRACT:
A method and an apparatus for measuring color of a moving web. The web is measured by reflectance measurement and transmittance measurement, wherein the reflectance measurement is carried out by illuminating a surface of the web in a measuring area, where on the other side of the web at the measuring area resides a solidly attached backing element and measuring the radiation reflected from the web. The transmittance measurement is carried out by illuminating the web and measuring the radiation transmitted through the web. The radiation measured in the transmittance measurement is transmitted through the backing element.

REFERENCES:
patent: 4243319 (1981-01-01), Lodzinski
patent: 4944594 (1990-07-01), Burk
patent: 5793486 (1998-08-01), Gordon et al.
patent: 2004/0021869 (2004-02-01), Shakespeare et al.

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