Size distribution analysis of microstickies treated by enzyme mixtures in papermaking whitewater, TAPPI Journal March 2019



Application: This work provides a new method for controlling microstickies and could serve as a valuable refer-ence for the future application of enzymes in papermaking.

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Author: Yanan Tang; Bo Li; Shengfang Geng; Carl Houtman; and Shubin Wu
Size distribution analysis of microstickies treated by enzym
ABSTRACT: Microstickies present a formidable challenge for papermakers. Many strategies have been explored o control them. Enzyme treatment is a promising technology, but the mechanism of its action has not been determined, thus inhibiting further application of this new technology. This study investigated characteristics and size distributions of microstickies treated by esterase-cellulase mixtures. Determination of particle size and number was accomplished using a modified flow cytometer, which combined streaming capillary flow, laser-based particle size analysis and fluorescent dye tracing. The results showed that treatment of samples with enzyme mixtures induced size reduction of the larger microstickies. This effect was most dramatic for 1:1 ratios of esterase to cellulase. The treated particles were more stable than untreated ones. The smaller microstickies treated with some ratios of esterase and cellulase tended to aggregate over time.
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