METHOD AND MEANS OF QUANTIFYING PERFORMANCE CHEMICALS IN PULP AND PAPER

摘要

A method for quantifying of theamounts of reacted and or retained per-formance chemicals selected from thegroup consisting of wet strength agentsstarches and retention agents, hydropho-bic agents and debonding agents in pulpand or paper, which method comprises(I) developing a calibration model by(I.a) registering absorption, reflectance oremission spectra of reference samples ofpapers containing known amounts of thesaid reacted and or retained performancechemicals to develop learning sets; (I.b)processing the spectral raw data, to re-duce noise and adjust for drift and dif-fuse light scatter, (I.c) performing a dataanalysis by applying chemometric tech-niques to the processed learning sets; and(II) determining the unknown amounts ofreacted and or retained pulp and paperperformance chemicals selected from thegroup consisting of wet strength agents,starches and retention agents, hydropho-bic agents and debonding agents by regis-tering the absorption, reflectance or emis-sion spectrum, in correspondence to (I.a),from the pulp and or paper of the un-known amounts of the said reacted and orretained performance chemicals of pulp and paper; processing the thereby obtained spectral raw data as according to (I.b); and applying thedeveloped calibration model to the processed data. Optionally, a data analysis step as according to (I.c) can also be applied to the processedspectral raw data from the paper of the unknown amounts of the said reacted and or retained performance chemicals.