Surface Treatment and Printing Properties of Dispersion-coated Paperboard
Paperboard was coated on a pilot scale using aqueous dispersions of styrene-butadiene (SB) copolymers in order to improve its surface characteristics (including printability) and barrier properties with regard to the transmission of water vapour. Coating the paperboard with the dispersion in two steps gave a smoother surface with a remarkable increase in gloss. The printing properties of the smoother double-coated surface were slightly better than those of the single-coated surface. Paraffin wax added to the latex dispersion reduced the water vapour transmission rate (WVTR) but had a negative effect on the printability of the board. The effect of two commonly used surface treatment techniques (corona and plasma at atmospheric pressure) on the printing and barrier properties of dispersion-coated (containing wax) paperboard was evaluated. A fairly intense corona treatment led to an undesirable increase in the WVTR-value. A less intense corona treatment preserved the WVTR-value to a great extent, but the printability remained at an unsatisfactory level. With plasma treatment, the water vapour barrier was not impaired, and the printability of the plasma-treated dispersion-coated (wax-containing) substrate was good. It is suggested that a better result using corona treatment may be obtained by optimising the power and controlling the time between the treatment and the printing, although this was not investigated here. © 2005 Elsevier B.V. All rights reserved.
T. P. Schuman et al., "Surface Treatment and Printing Properties of Dispersion-coated Paperboard," Progress in Organic Coatings, Elsevier, Jan 2005.
The definitive version is available at http://dx.doi.org/10.1016/j.porgcoat.2005.06.010
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© 2005 Elsevier, All rights reserved.