Effects of artificial thermal aging on variations in color of commercial papers

초록

Effects of artificial thermal aging on color variations of various commercial papers (fine paper, coated paper, newsprint and filter paper) were investigated. With thermal aging at 105°C, most of papers showed a special trend in a∗ -b∗ plane: the a∗ (red-green) values of the samples were initially reduced (heading to - a ∗side) and after a turning point they increased to +a∗ side while the b∗ (blue-yellow) values were kept increased to +b∗ side (yellowing of paper). Different papers had different turning points for a∗ value. The filter paper consisted of a pure chemical pulp and the copy paper with OB A (optical brightening agent) showed the latest hiring points. In addition, the papers without OBA showed less reduction in brightness compared with that with OBA, suggesting that OBA could adversely influence the brightness stability during thermal aging.

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