Metered Size Press Pigmentation for Fiber Reduction, 2008 PAPERCON Conference

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Recent formulation design experiments have begun to show how pigmented sizes may be designed for fiber replacement without sacrificing paper properties. Pigment shapes and sizes influence paper mechanical properties and pigment color affects sheet brightness, opacity, whiteness and shade. This report shares results obtained using combinations of these variables investigated at laboratory and pilot scales. Average pigment shape is varied through the ratio between ground calcium carbonate and kaolin. Variations in both calcium carbonate and kaolin size and kaolin brightness are also included. Variations in optical brightener content are used to offset differences in pigment brightness. Results demonstrate that stiffness and other mechanical and optical qualities can be maintained while reducing the amount of fiber used, with significant potential economic advantages.