SHORT TIME WATER ABSORPTION INTO MULTILAYER CURTAIN COATED LINERBOARD , PaperCon 2013

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Interest for water absorption into paper during short contact times has a long history. Water transport into coated paper is even more complex phenomenon, because the coated paper structure can also be layered. This work was carried out to understand and explain the short time water penetration characteristics into single and double layer curtain coated linerboards. Linerboards products are often printed with water-based flexographic inks without external drying, and the immobilization of the printed ink is dependent on how much and/or how fast the liquid phase is absorbed by the substrate. The impact of base sheet properties (hydrophobicity, roughness etc.) and properties of coating layers (coat weight, pore size, porosity etc.) on short time water absorption into coated linerboard is described. The coating layer absorption rate is initially high, compared to an uncoated fiber layer. Once the coating layer becomes filled with water, the absorption slows down, and an uncoated hydrophilic web absorbs significantly more water than a coated web at longer penetration times. However, a hydrophobic base sheet absorbs only marginal amount of water, unless an external pressure is applied. A porous coating structure formed by narrow particle size pigments with low binder level absorbs water faster than a wide pigment particle size coating with low pore volume and higher binding level.