Refinability of mercerized softwood kraft pulp

IF 4.8 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD Cellulose Pub Date : 2024-06-08 DOI:10.1007/s10570-024-05999-2

Antti Koistinen, Huaicheng Wang, Eero Hiltunen, Tapani Vuorinen, Thaddeus Maloney

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Abstract

In this study, the impact of mercerization and PFI refining on the properties of softwood kraft pulp was investigated. Never-dried softwood kraft pulp was treated with 15 wt% NaOH to generate highly hydrated fibers, followed by PFI refining to increase pulp fibrillation and porosity. The original and modified pulp properties were assessed for morphological and chemical composition. Differential scanning calorimetry (DSC) tests and water retention value (WRV) measurements were conducted to evaluate pulp swelling behavior and porosity. Fiber bonding potential and strength properties were evaluated from handsheets of mercerized and unmercerized pulp. Mercerization with 15 wt% NaOH successfully converted cellulose I to cellulose II, leading to slightly increased pulp swelling and micropore volume. However, the mercerization reduced handsheet strength properties. Furthermore, PFI refining resulted in a negligible enhancement of bonding in mercerized pulp, in stark contrast to its significant effect on unmercerized kraft pulp.

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丝光软木牛皮浆的精制能力

本研究调查了丝光处理和 PFI 磨浆对软木牛皮浆特性的影响。用 15 wt% 的 NaOH 处理未干燥的软木牛皮浆，生成高度水合的纤维，然后进行 PFI 磨浆，以增加纸浆的纤度和孔隙率。对原浆和改良浆的形态和化学成分特性进行了评估。通过差示扫描量热法（DSC）测试和保水值（WRV）测量来评估纸浆的膨胀行为和孔隙率。通过丝光和未丝光纸浆的手纸评估了纤维粘合潜力和强度特性。用 15 wt% 的 NaOH 进行丝光处理成功地将纤维素 I 转化为纤维素 II，导致纸浆膨胀和微孔体积略有增加。然而，丝光处理降低了手感强度特性。此外，PFI 磨浆对丝光纸浆粘合力的增强微乎其微，这与它对未丝光牛皮纸浆的显著效果形成了鲜明对比。

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来源期刊

Cellulose 工程技术-材料科学：纺织

CiteScore

10.10

自引率

10.50%

发文量

580

审稿时长

3-8 weeks

期刊介绍： Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.