Laboratory method for determining the source of brightness loss at a southern United States bleached paperboard mill, TAPPI Journal October 2018

ABSTRACT: Bleached pulp is known to lose some brightness between the end of the bleach plant and the paper machine reel. An ISO brightness drop of 1–3 points is often experienced. There are many reasons for the brightness loss; however, the usual suspects tend to be water quality, metallurgy, and process chemicals.One bleached paperboard mill in the southern United States had been experiencing brightness losses in the 6–8 point range for several years. A systematic study was conducted to determine the potential sources for this bright-ness loss. A laboratory simulation technique was developed to demonstrate the potential causes for the brightness loss along the process.

Application: This study examines how to define the relevant aspects of a pulp/papermaking process, followed by systematically modeling the effect of process chemicals on paper brightness. The concepts of this study may be used by process engineers to model their process in a laboratory, and to investigate the root cause for changes in many paper properties. 

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