The Evolution of Tinting Dyes and Optical Brighteners in White Papers, 2011 PaperCon Conference

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The world of white papers changed tremendously in 2005 and since in North America. In that year, International Paper increased the TAPPI directional brightness from 84, on average, to 92. The concept of CIE whiteness was also introduced to the North American market in 2005, and the change in that parameter was from roughly 100 to 146. These changes in optical properties meant a “night and day” difference in the appearance of paper products for printing & writing grades, reprographic, book papers, etc. To make these changes in the optical properties of paper, mills in the U.S. and Canada, in particular, had to change the types and/or quantities of tinting dyes and optical brightening agents used in their manufacture. Ripples of change and optimization efforts continue today.