Abstract
Liquid transfer in a heatset printing process to coated papers has been
evaluated online. The porous coatings, applied in various combinations
of single coating onto a fine paper substrate, together with selective
particle size distributions containing calcium carbonate pigments were
calendered under different conditions to establish a range of porosities
and pore structures while keeping the formulation and hence the surface
chemistry constant. The transfer of fountain solution to the papers was
analyzed from unprinted areas (nonimage) at six different positions
along the printing line, namely, between each printing unit and after
the dryer section, using near-infrared absorption reflectometry. In this
way, real-time analysis of the amount of fountain solution (defined as
water content) transferred to the paper per printing unit as a function
of physical paper surface characteristics has been achieved. The role of
printing speed and fountain solution dosage level on water uptake by
the various coated paper substrates has been investigated. It was
concluded that the higher the speed, firstly, there is less compression
of the surface roughness and, secondly, less time for the liquid to
respond with respect to capillary forces, resulting in less liquid
transfer.
Original language | English |
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Pages (from-to) | 4446-4457 |
Journal | Industrial & Engineering Chemistry Research |
Volume | 50 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2011 |
MoE publication type | A1 Journal article-refereed |