Is It Possible To Produce Double Coated Woodfree High Gloss Art Paper With An MSP+MSP Production Line?, 2007 Coating & Graphic Arts Conference

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The paper industry has experienced continuous paper price erosion during the last 10–15 years. During this period the industry has streamlined its production and organizations, machine speed and efficiency have been increased, and high performing value adding raw materials have been selected to reduce total raw material costs. In some areas, such as machine width, the limit has been reached and development is now focused on more efficient production concepts. One such concept is to significantly increase the profitability of the papermaking line. The coating concept discussed in this article is based on a robust and high efficiency film coating technology and performance minerals.

An all-on-line double coated (2C2S) metered size press(MSP)line brings production efficiency improvements, lower investment cost and the possibility of running with lower Kraft content in the base paper when compared to more traditional double coating concepts, like a blade top coat on top of a metered size press precoat. Additionally, this concept would allow an uncoated line to be rebuilt for double coated paper production through installation of only two coaters.

The target in this study was to produce a high gloss coated wood free paper, with a number of production concepts starting from a Blade+Blade configuration, through MSP+Blade coating onto MSP+MSP coating. The gloss target of 80% was seen as a challenging enough target to broaden the scope to cover a broad range of glossy coated paper applications. Efforts to link the visual impression of the printed surface to paper properties were part of the project, with special emphasis on surface structure related measurements that might shed some light onto the effect that the film split pattern has been stated to have on printed quality.