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白度是纸张重要光学性能之一 ,一般认为纸张泛黄白度下降表示老化即耐久性变坏。实验通过紫外光人工老化试验发现纸张吸收光能时间较长 ,白度下降到一定值后或平缓不变、或稍有回升 ,白度值与机械强度值并不同步下降。白度下降率不完全能作为纸张耐久性变差的物理性能指标。
Whiteness is one of the important optical properties of paper, paper generally refers to the decline in yellowing and whiteness that deterioration of aging or deterioration. Experiments by UV artificial aging test found that the paper absorbs light energy for a long time, whiteness decreased to a certain value or gentle, or a slight rebound, whiteness and mechanical strength values are not synchronized decline. Whiteness reduction rate is not entirely as a physical deterioration of paper durability index.