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Journal articles
Open Access
Optimization of optical coverage of board surfaces with assessment of light scattering and absorption using mineral as a coating component, TAPPI Journal June 2026

ABSTRACT: One of the primary functions of mineral inclusion into paper or paperboard is to improve the optical performance of the substrate. A coating may be applied to a sheet in order to cover a dark base, to improve the sheet opacity, to give the correct smoothness and gloss, or to give a suitable surface on which to print. The brightness of a pigment has long been used as a guide for pigment choice in paper and board. However, the measured paper brightness is a function of color and light absorption (K) of the coating and base and the light scattering (S) within the sheet resulting from interfaces with different refractive index. The optical performance can be quantified by measuring the S&K coefficients as described by the Kubelka-Munk model/theory in a filled or coated paper sheet. In coating, this is often assessed as a function of coat weight, and the corresponding physical sheet properties are assessed at the same time; for example, the correct gloss, smoothness, point-to-point uniformity, and printability. The optical performance in the sheet is often not directly related to the pigment brightness, but is largely a function of the particle packing within the sheet and coating layer. In the first and second main sections of this work, respectively, we show how S&K calculations from the Kubelka- Munk equations can be used in coated sheets to determine the optical performance and how this can be used as a predictive tool for the final sheet performance. This is presented for base sheets with different starting brightness. The third section of this work focuses on how mineral combinations in coatings can be used to improve the light scattering and consequently the optical performance of the board. We include theoretical considerations and then finally share a case study for improvement on the optical properties of recycled board.

Journal articles
Open Access
Comparative annual cost efficiency between thermal and chemical oxidation of TRS in kraft mills, TAPPI JOURNAL, July 2005, Vol. 4(7) (200 KB)

Comparative annual cost efficiency between thermal and chemical oxidation of TRS in kraft mills, TAPPI JOURNAL, July 2005, Vol. 4(7) (200 KB)

Journal articles
Open Access
Reduction of pulp fiber accumulation in the header of uf modules, TAPPI JOURNAL, May 2000, Vol. 83(5)

Reduction of pulp fiber accumulation in the header of uf modules, TAPPI JOURNAL, May 2000, Vol. 83(5)

Journal articles
Open Access
The use of ozone as a biocide in paper machine recycled white water, TAPPI JOURNAL, May 2000, Vol. 83(5)

The use of ozone as a biocide in paper machine recycled white water, TAPPI JOURNAL, May 2000, Vol. 83(5)

Journal articles
Open Access
Wood and paper properties of short rotation poplar clones, TAPPI JOURNAL, May 2000, Vol. 83(5)

Wood and paper properties of short rotation poplar clones, TAPPI JOURNAL, May 2000, Vol. 83(5)

Journal articles
Open Access
Dispersion of pulp slurries using carboxymethylcellulose, TAPPI JOURNAL, October 2000, Vol. 83(10)

Dispersion of pulp slurries using carboxymethylcellulose, TAPPI JOURNAL, October 2000, Vol. 83(10)

Journal articles
Open Access
Qualification of welding procedures for duplex stainless steels, TAPPI JOURNAL, September 2000, Vol. 83(9)

Qualification of welding procedures for duplex stainless steels, TAPPI JOURNAL, September 2000, Vol. 83(9)

Journal articles
Open Access
Bleaching of recycled fibers by adding sodium borohydride to a peroxide reinforced oxygen stage, TAPPI JOURNAL, June 2001, Vol. 84(6)

Bleaching of recycled fibers by adding sodium borohydride to a peroxide reinforced oxygen stage, TAPPI JOURNAL, June 2001, Vol. 84(6)

Journal articles
Open Access
Are your thermowells safe?, TAPPI JOURNAL, April 2002 (270KB), (TAPPI JOURNAL APRIL 2002)

Are your thermowells safe?, SOLUTIONS! & TAPPI JOURNAL, April 2002 (270KB)

Journal articles
Open Access
Development and validation of an improved drainage testing, TAPPI JOURNAL, April 2000, Vol. 83(4)

Development and validation of an improved drainage testing, TAPPI JOURNAL, April 2000, Vol. 83(4)

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