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| Study on the Effect of Fiber Morphological Structure on the Swelling-dissolution Behavior and Spinnability of Dissolving Pulp |
| Received:January 20, 2025 Revised:February 26, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.08.011 |
| Key Words:dissolving pulp fiber morphological structure swelling property dissolution property rheological properties |
| Fund Project:国家自然科学基金（32171727， 22208247）；天津市自然科学基金（24JCQNJC00330）。 |
| Author Name | Affiliation | Postcode | | QIAN Xinyu* | China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102
School of Light Industry Science and Engineering, State Key Lab of Bio-based Fiber Materials, China Textile Industry Key Lab of High-performance Fibers Wet-laid Nonwoven Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457
National Engineering Lab for Pulp and Paper, Beijing, 100102 | 100102 | | YANG Shuo* | School of Light Industry Science and Engineering, State Key Lab of Bio-based Fiber Materials, China Textile Industry Key Lab of High-performance Fibers Wet-laid Nonwoven Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | WANG Xin | China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102
National Engineering Lab for Pulp and Paper, Beijing, 100102 | 100102 | | GUO Yuqian | China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102
National Engineering Lab for Pulp and Paper, Beijing, 100102 | 100102 | | CHENG Yun | China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102
National Engineering Lab for Pulp and Paper, Beijing, 100102 | 100102 | | HOU Leilei | China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102
National Engineering Lab for Pulp and Paper, Beijing, 100102 | 100102 | | CHEN Linghua | China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102
National Engineering Lab for Pulp and Paper, Beijing, 100102 | 100102 | | ZHANG Hongjie* | China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102
National Engineering Lab for Pulp and Paper, Beijing, 100102 | 100102 |
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| Abstract:The fiber (S-PHK，S-PHK-R30，S-PHK-R50) morphological structure of the softwood pre-hydrolysis kraft pulp was regulated by using fiber fractionation. The influence of fiber size and pore structure of dissolving pulp fibers on the swelling-dissolution behavior and rheological properties in cellulose-NMMO-water solutions under the Lyocell process was investigated. The results showed that compared with S-PHK-R30， the average length of S-PHK-R50 decreased by 50.4%， and the specific surface area increased by 123.6%. This resulted in a about 100 percentage points increase in NMMO absorption value and a 25 min reduction in dissolution time when the dissolving pulp was swollen in a mass ratio of 70% NMMO solution for 20 min. The small fiber size and high specific surface area were beneficial for promoting the penetration of aqueous NMMO solution inside the pulp fibers， thereby achieving a better swelling effect and reducing the required dissolution time. In addition， the fiber morphological structure between fiber fractions of dissolving pulp significantly affected the steady-state rheological properties of cellulose-NMMO-water solutions but did not affect the dynamic rheological properties. |
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