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Laboratory high consistency dispersion studies of mixed office waste paper and comparison with recycle mill samples

机译:混合办公室废纸的实验室高浓度分散研究以及与回收厂样品的比较

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A laboratory study is presented of high consistency dispersion using a bench scale hand fed 12 inch refiner. The study consists of several parts: (1) preliminary trials using refiner-type and knuckle-type plates; (2) dispersion of furnishes repulped at three consistencies, 6, 12 and 18 percent; and (3) dispersion of a furnish repulped at 12 percent consistency and subjected to three consecutive passes. Samples from two recycle mills were also examined. Results consist of toner particle size and area distribution curves obtained by image analysis, and fiber/toner detachment information obtained by visual microscopic examination. The particle size distributions of the furnishes repulped at 6, 12 and 18 percent consistency are very different, with the 6 percent sample having many more larger and fewer small particles compared to the 12 percent, and especially the 18 percent, samples. After dispersion, especially after the smallest plate gap separation used, the distributions are very similar or nearly identical. However, the ratios of clean-to-hairy particles for each repulped furnish remain virtually unchanged. It appears that the repulping consistency determines which fiber/toner "bonds" will be broken, and although dispersion is effective in further breaking down toner particles, it is not effective (at the temperature of these trials) in further detaching toner from fiber. The influence of consecutive passes of the same gap setting is to approach a unchanging distribution of toner particle sizes. This occurred after only two passes at hte smallest gap spacing used. However, as with the consistency trials there was no change in the clean/hairy ratios before and after dispersion. Two mill samples were examined, one displaying what appears to be good dispersion, and the second rather poor dispersion. One sample was examined microscopically and large increases in clean toner particles were observed after dispersion. This increase is attributed to the high dispersion temperatures employed, which tends to soften the thermoplastic toner and facilitate fiber/toner "unbonding" and detachment.
机译:使用台式规模的手动进料12英寸精磨机进行了高浓度分散的实验室研究。该研究包括以下几个部分:(1)使用磨浆机和转向节型板的初步试验; (2)以三种浓度(6%,12%和18%)重新调配配料的分散度; (3)以12%的稠度再次粉碎的配料分散液,并连续经过3次。还检查了来自两个回收厂的样品。结果包括通过图像分析获得的墨粉粒径和面积分布曲线,以及通过视觉显微镜检查获得的纤维/色粉分离信息。分别以6%,12%和18%的稠度重新调制的配料的粒度分布是非常不同的,与6%(尤其是18%)的样品相比,6%的样品具有更大或更小的小颗粒。分散后,尤其是在使用最小的板间隙分离之后,分布非常相似或几乎相同。但是,每种重新调浆过的配料的清洁毛状颗粒的比例实际上保持不变。似乎再浆稠度决定了哪些纤维/色粉的“结合”将被破坏,并且尽管分散有效地进一步分解了调色剂颗粒,但是(在这些试验的温度下)它在进一步使调色剂与纤维分离方面是无效的。相同间隙设置的连续遍历的影响是接近调色剂粒径的不变分布。这仅在使用最小间隙间隔的两次通过之后发生。但是,与稠度试验一样,分散前后的净/毛比没有变化。检查了两个研磨样品,其中一个显示出良好的分散性,第二个显示出较差的分散性。显微镜检查了一个样品,分散后观察到清洁的调色剂颗粒大量增加。这种增加归因于所采用的高分散温度,其倾向于软化热塑性调色剂并促进纤维/调色剂“松开”和分离。

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