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The aim of this research was to investigate the influence of natural zeolite clinoptilolite used as a filler on the printabi1ity of paper and its print quality. Paper handsheets were prepared with the addition of 20% of fillers, where natural zeolite was added to calcium carbonate in different u.w.% (i.e. 20, 40, 60). Zeolite originates from the sedimentary deposit in Donje Jesenje, Croatia. Zeolite tuff is mainly composed of clinoptilolite. lts particle size distribution is broad and the structure is micro- and mezzo-porous. The addition of natural zeolite as a filler resulted in higher bulk of paper sheets and a more porous structure. Moreover, the absorption capacity and the absorption rate slightly increased. The surface roughness increased, leading to a more hydrophobic surface. Natural zeolite with its broad particle size distribution, higher amount of large particles and yellowgreen colour resulted in slightly lower opacity and ISO brightness of sheets. When used for ink jet printing, the increased amount of zeolite showed a positive influence on the print quality. Smaller wicking and bleeding effects were noticed. Paper hue did not influence the colour density of CMYK prints.

PRINTING.Natural zeolite as filler in base ink jet paper sheet