Peroxide edge wick absorption was measured on laboratory sheets made of TCF- and ECF-bleached hardwood kraft pulps with different amounts of extractives. The results show that a high amount of extractives in the sheets is very detrimental for a good efficiency of the retained AKD in the sheets. Since the extracted sheets show a better sizing at a similar amount of extractives compared with non-extrtacted ECF sheets the results also indicate that some other factors than just the amount of extractives is important for the sizing development. At low AKD-dosage levels the dry sheet density has a large impact on the liquid penetration, and sheets made of different materials has to be compared at the same sheet density. In this case the density effect was observed up to 3 kg/ton AKD, and the sheets of ECF-bleached kraft showed a better resistance against liquid penetration than the TCF-bleached kraft sheets, when compared at the same sheet density.
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机译：在由TCF和ECF漂白的硬木牛皮纸浆和不同量提取物制成的实验室薄板上测量了过氧化物边缘芯吸收。结果表明，板中大量的萃取物对于板中保留的AKD的良好效率非常不利。由于与未拉伸的ECF纸相比，在相同量的萃取物中，萃取纸表现出更好的施胶性能，因此结果还表明，除萃取物的数量外，其他一些因素对于施胶开发也很重要。在低AKD剂量水平下，干纸密度对液体渗透性有很大影响，因此必须以相同的纸密度比较由不同材料制成的纸。在这种情况下，观察到高达3 kg / t AKD的密度效应，并且在相同的纸页密度下，与TCF漂白的牛皮纸相比，ECF漂白的牛皮纸的耐液体渗透性更好。
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