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Method for producing continuous in-like kappa measurements for papermaking pulps
   
Document Number
US Patent 6069688
Issued Date
May 30, 2000
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Abstract
A method for the continual, real-time, in-situ generation of a Kappa number used by a process control system to control the delignification of papermaking pulps is disclosed. The method converts a plurality of analog output signals representing the intensities of spectral bands of light energy reflected by the pulp, and feedback analog output signals representing the intensities of spectral bands of light energy before they are injected into the pulp, into digital output values. The digital output values are then normalized in accordance to a normalization algorithm and stored with a time marker. The normalized values are used along with previously-stored coefficient values that represent a model of the delignification process for any particular point in time, and in accordance to the time marker and configuration data from a configuration computer, a Kappa number representation is calculated in accordance to a Kappa number-generating algorithm. The Kappa number representation is then converted into a signal form acceptable by the process control system and used to control the delignification process.
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Method for producing continuous in-like kappa measurements for papermaking pulps - US Patent 6069688 Drawing
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Number of Claims:
18
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Published
May 30, 2000
Application Number
08/988,971
Filed
December 11, 1997
US Classification
356/73   356/318 356/425
Int'l Classification
D21C   7/12   (20060101)   G01N   21/31   (20060101)   D21C   9/10   (20060101)   D21C   7/00   (20060101)  
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Parent Case
CROSS-REFERENCE TO RELATED APPLICATIONS The present application is related to co-pending application, Ser. No. 08/988,972, titled "An Apparatus Used In Determining the Degree of Completion of a Processed Medium"; and co-pending application, Ser. No. 08/989,720, titled "A Continuous In-Line Kappa Measurement System"; both applications filed on the same date herewith, and both applications having a common assignee as the present invention.
USPTO Field of Search
356/73   356/318   356/425  
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