The contribution of pulp brightness and optical brightening agents to paper whiteness, 2013 PEERS Conference

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The desired optical properties of a paper can be achieved through a variety of tools: pulp brightness, optical brightening agents, dyes or filler qualities. In this work, we explore the interaction between pulp brightness levels and optical brightening agents (OBA) addition on paper whiteness. Conditions were chosen that approximate an uncoated freesheet grade. Papers were prepared using eucalyptus Kraft pulps bleached to three different brightness levels. A constant filler level and optimized retention chemistry were used in the preparation. The addition of OBA was evaluated as a wet-end only application and as a wet-end/size press application. Dye addition was not a part of this evaluation. Additionally, in this work, we surveyed the optical properties of a range of commercially available uncoated freesheet paper.