Effects of Base Paper Properties on Sub-Millimeter Non-Uniformity of Coating Layer, 1993 Coating Conference Proceedings

Hideki Fujiwara, Chizuru Wakai, Osamu Kozuka

Single and double coated paper samples with wood free and wood containing base papers were prepared on a pilot coater. The sub-millimeter uniformity of coat weight, sheet gloss, print gloss, and ink density were measured with the Chromatoscanners. Smoothness and gloss for wood free coated paper were better than those of wood containing coated paper. Smoothness and gloss were improved by double coating for both wood free and wood containing coated papers. On the other hand, coating mass distribution in a sub-millimeter scale was almost the same level regardless of the kind of base paper. At the same level of coat weight uniformity, ink density mottle for wood free coated paper was larger than wood containing coated paper. While, print gloss profile for wood containing coated paper was poorer than wood free coated paper. In the case of wood containing base paper, water loss in the coating color tool place more between the blade and the dryers. This water loss was reduced by pigment precoating of wood containing base paper.