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不透明度是新闻纸的一项重要指标。降低新闻纸的定量及提高纸张的白度,则会造成不透明度的下降。为了生产高不透明度、低定量并且白度达到65%ISO的新闻纸,可采用下述三种方法。一是在新闻纸配料中添加填料改善纸张的不透明度,填料必须具有较高的光散射能力和孔隙率,添加量较低,不同填料有不同的效果;其二是通过添加荧光增白剂来获得较高的白度而不损失不透明度;其三是当脱墨浆作为新闻纸的主要配料时,为获得较高的不透明度,建议采用较高的漂白温度,较低的pH,且在热分散或漂白后进行后浮选。
Opacity is an important indicator of newsprint. Reduce the quantitative newsprint and improve the whiteness of the paper, it will cause the opacity of the decline. To produce newsprint with high opacity, low basis weight, and a whiteness of 65% ISO, the following three methods are available. First, the addition of filler in the newsprint paper to improve the opacity of the paper, the filler must have high light scattering ability and porosity, the lower the amount of different fillers have different effects; the second is by adding fluorescent brightener to obtain Higher whiteness without loss of opacity; thirdly, to obtain higher opacity when deinking pulp is the main ingredient of newsprint, it is advisable to use a higher bleaching temperature, a lower pH, Or after bleaching after flotation.