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 brightness loss. A laboratory simulation technique was developed to demonstrate the potential causes for the brightness loss along the process.
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