Pulp Fines-Characterization, Sheet Formation, and Comparison to Microfibrillated Cellulose
Pulp Fines-Characterization, Sheet Formation, and Comparison to Microfibrillated Cellulose
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DOI：
10.3390/polym9080366
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发表时间：
2017-08-01
期刊：
影响因子：
5
通讯作者：
Bauer, Wolfgang
中科院分区：
文献类型：
--
作者：
Fischer, Wolfgang Johann;Mayr, Melanie;Bauer, Wolfgang
在纸浆和造纸工业中，在制浆（初级细粉、机械细粉）和/或精炼过程（二次细粉）过程中会产生不同类型的纸浆或纤维细粉。除了纤维之外，这些纤维素微粒是纸张网络的另一个组成部分。细粉被定义为能够穿过网筛或孔径为 76 μm 的穿孔板的纸浆部分，已知会影响最终纸产品的性能。为了更好地了解这种材料的效果和特性，必须将细粉从纸浆中分离出来，并作为独立材料进行研究。在本研究中，通过实验室压力筛将细粉从纸浆部分中分离出来。为了便于进一步加工，使用溶气气浮增加了所产生的细粉悬浮液的固体含量。测定不同类型细粉和其他纤维素微粒（例如微原纤化纤维素 (MFC)）的形态特性并进行相互比较。此外，用这些材料制备手抄纸，并测量表观密度、接触角、弹性模量和应变等性能，与测试的 MFC 等级相比，分析的细粉类型得到类似的结果。对细纤维特性的分析一方面有助于更好地了解这些材料如何影响最终纸产品，另一方面有助于确定该材料的其他潜在应用。
In the pulp and paper industry different types of pulp or fiber fines are generated during the pulping (primary fines, mechanical fines), and/or the refining process (secondary fines). Besides fibers, these cellulosic microparticles are a further component of the paper network. Fines, which are defined as the fraction of pulp that is able to pass through a mesh screen or a perforated plate having a hole diameter of 76 mu m, are known to influence the properties of the final paper product. To better understand the effect and properties of this material, fines have to be separated from the pulp and investigated as an independent material. In the present study, fines are isolated from the pulp fraction by means of a laboratory pressure screen. To allow for further processing, the solids content of the produced fines suspension was increased using dissolved air flotation. Morphological properties of different types of fines and other cellulosic microparticles, such as microfibrillated celluloses (MFC) are determined and compared to each other. Furthermore, handsheets are prepared from these materials and properties, such as apparent density, contact angle, modulus of elasticity, and strain are measured giving similar results for the analyzed types of fines in comparison to the tested MFC grades. The analysis of the properties of fiber fines contributes on the one hand to a better understanding of how these materials influences the final paper products, and on the other hand, helps in identifying other potential applications of this material.