METHOD OF QUANTIFYING PERFORMANCE CHEMICALS IN PULP AND PAPER

摘要

A method for quantifying of the amounts of reacted and/or retained performance chemicals selected from the group consisting of wet strength agents, starches and retention agents, hydrophobic agents and debonding agents in pulp and/or paper, which method comprises (I) developing a calibration model by (I.a) registering absorption, reflectance or emission spectra of reference samples of papers containing known amounts of the said reacted and/or retained performance chemicals to develop learning sets; (I.b) processing the spectral raw data, to reduce noise and adjust for drift and diffuse light scatter; (I.c) performing a data analysis by applying chemometric techniques to the processed learning sets; and (II) determining the unknown amounts of reacted and/or retained pulp and paper performance chemicals selected from the group consisting of wet strength agents, starches and retention agents, hydrophobic agents and debonding agents by registering the absorption, reflectance or emission spectrum, in correspondence to (I.a), from the pulp and/or paper of the unknown amounts of the said reacted and/or retained performance chemicals of pulp and paper; processing the thereby obtained spectral raw data as according to (I.b); and applying the developed calibration model to the processed data. Optionally, a data analysis step as according to (I.c) can also be applied to the processed spectral raw data from the paper of the unknown amounts of the said reacted and/or retained performance chemicals.