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A new method has been developed to measure the kappa number of single wood fibers. The method uses the fluorescence properties of the stain Acridine Orange. It has been found that Acridine Orange fluorescence shifts to the red end of the spectrum with increasing kappa. Measurements of the Acridine Orange fluorescence spectra have revealed that there are two fluorochromes responsible for the red shift behavior. The peak heights of the spectra have been used to derive calibration curves. Using these curves we have estimated single fiber kappas. It is found that even in very carefully produced pulps there is a significant kappa variance. In commercial pulps, this variance is larger. As kappa increases the pulp becomes more non-uniform. The application of Acridine Orange fluorescent properties to develop an automated single fiber kappa analyzer is also discussed.
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Application of Single Fiber Fluorescence Staining to Assess Kappa Uniformity, 1998 Pulping Conferenc
