EFFECTS OF DIFFERENT FILLER COMBINATION WITH TALC AND CALCIUM CARBONATE ON PAPER PROPERTIES/PRINTABILITY

摘要

This paper investigated mainly the effects of talc and ground calcium carbonate (GCC) mixed filler in wet end applications on the handsheet paper properties and printability. Particle sizes of talc and GCC were of 2 grades each: 7.96 and 16.07; and 1.99 and 4.99 mu m, respectively. The mix ratios of talc/GCC were as follows: 100/0, 75/25, 50/50, 27/75, and 0/100. The examined paper properties included bulk, sizing degree, air permeability, coarseness, tensile strength, bursting strength, tearing strength, stiffness, printed gloss, print density, ink absorption, and print-through. The results indicated that mixed talc/GCC fillers performed better than either pure talc or GCC with respect to bulk, sizing degree, tensile index, stiffness, printed gloss, ink absorption, and print-through properties. However, smoothness and print density were reduced, while coarseness increased. Pure talc compared favorably to GCC with respect to sizing degree, tensile strength, smoothness, roughness, and printed gloss; but was poorer in bulk and ink absorption.