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Precoat and Topcoat Effects on Final Printability – Part 3: Coating structure and Deltack results analysis
September 1, 2010 By Pulp & Paper Canada
Abstract: The development of a new coating formulation is demanding in time and analysis. It is therefore important to understand what effects could result from changes made to a coating formulation. …
Abstract: The development of a new coating formulation is demanding in time and analysis. It is therefore important to understand what effects could result from changes made to a coating formulation. The mercury intrusion results presented herein played an integral part in the overall understanding of how the coating structure behaved when changing the precoat pigment or topcoat latex of a double coated paper. This study clearly demonstrates the difference between styrene/butadiene and styrene/acrylic latex and how the topcoat structure and printability are impacted. The different lattices performed differently, and it was shown that they do not penetrate in the same way into the same precoat. The chemistry of the latex had a definite impact on the final printability. The results also show it is possible to modulate the precoat pigment formulation to achieve a desired coating structure.
Paper presented at the PAPTAC Annual Meeting 2010 in Mon-treal, Que., February 2-3, 2010.
Keywords: MERCURY INTRUSION, WASHBURN EQUATION, HEXADECANE, PORE, PORE STRUCTURE, CONTACT ANGLE, SURFACE ENERGY, INTERFACIAL TENSION, BLANK CORRECTION, DOUBLE COATED PAPER, FREE SHEET, STYRENE-BUTADIENE, STYRENE ACRYLIC, STYRENE ACRYLIC/ACRYLONITRILE, DELTACK, PRINTABILITY, MAXIMUM FORCE, TIME.
Full manuscript available at www.paptac.ca.
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