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Study on the Response Relationship Between the Types and Characteristics of Pulp Fibers and Their Gel Point Concentrations
Received:February 17, 2023  
DOI：10.11980/j.issn.0254-508X.2023.11.006
Key Words:gel point concentration  Canadian Standard Freeness  water retention value  crowding number theory
Fund Project:国家自然科学基金项目（32171727、32001276）。
Author NameAffiliationPostcode
CHEN Junzhong* Wingfat （He’nan） Molded Fiber Technology Development Co.， Ltd.， Huaxian， He’nan Province， 314100 314100
WANG Chao Wingfat （He’nan） Molded Fiber Technology Development Co.， Ltd.， Huaxian， He’nan Province， 314100 314100
ZUO Huawei Wingfat （He’nan） Molded Fiber Technology Development Co.， Ltd.， Huaxian， He’nan Province， 314100 314100
HE Guangde Wingfat （He’nan） Molded Fiber Technology Development Co.， Ltd.， Huaxian， He’nan Province， 314100 314100
ZHANG Wenhui College of Light Industry Science and Engineering， Tianjin University of Science and Technology， Tianjin， 300457 300457
ZHAO Tao China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
ZHANG Xue 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 settlement of three pulp fibers （bleached softwood pulp， bleached bamboo pulp and bleached bagasse pulp） was compared to analyze the effects of fiber types and characteristics on the gel point concentration （Cg）， further to provide the key information of fiber network during the dewatering of pulp fiber suspension. The results showed that there was a negative relationship between the Canadian Standard Freeness （CSF） and the Cg. With the increase of fiber water retention value （WRV）， the Cg increased， and the effect of WRV on the Cg was affected by fiber type. With the increase of fiber length-weighted length （L）， the Cg decreased. When the L increased to 1.2 mm， the Cg basically remained unchanged. The change of Cg at a high aspect ratio （>20） could be well explained by the crowding number theory or the effective medium theory. However， both theories cannot directly explain the change of Cg at a lower aspect ratio， and non-physical parameters （such as surface charge） of fibers needed to be considered.
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