Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Reexamination Certificate
2008-01-29
2008-01-29
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
C162S125000, C162SDIG004, C700S128000, C356S429000, C073S159000
Reexamination Certificate
active
11039334
ABSTRACT:
A method for determining the basis weight of a first ply of a fibrous web, which covers a second ply of the fibrous web including the steps of positioning an electromagnetic transmitter and an electromagnetic receiver, radiating the fibrous web, receiving a measuring signal and a reference signal, and determining the basis weight. The positioning an electromagnetic transmitter and an electromagnetic receiver step includes positioning them proximate to a side of the first ply. The radiating the fibrous web step is accomplished by the electromagnetic transmitter radiating the fibrous web with at least one measuring wavelength and at least one reference wavelength, the second ply having different optical characteristics at the measuring wavelength than at the reference wavelength. The receiver receives a measuring signal, which is returned at the measuring wavelength and the receiver receives a reference signal that is returned at the reference wavelength. The basis weight of the first ply being determined by utilizing a comparison of the measuring signal and the reference signal.
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Ischdonat Thomas
Muench Rudolf
Hug Eric
Taylor & Aust P.C.
Voith Paper Patent GmbH
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