Effect of Sheet Moisture and Calender Pressure on PCC and GCC Coated Papers, 2006 Coating & Graphic Arts Conference
Previous work demonstrated that narrow distribution coating PCC allowed high moisture calendering with no loss of optical properties. Broader distribution pigments exhibited a significant loss of optical properties when moisture increased and pressure was adjusted to match initial gloss. This report rationalizes these results by considering macro- and micro-smoothness. It is demonstrated that narrow distribution coating PCC produces high micro-smoothness even in the absence of calendering; calendering is only necessary to supply macro-smoothness via base paper deformation. Therefore at higher moisture, pressure can be reduced so no additional base paper deformation occurs and optical and physical properties of the final coated paper are equivalent to those achieved with lower moisture and higher pressure.
Effect of Sheet Moisture and Calender Pressure on PCC and GCC Coated Papers, 2006 Coating & Graphic