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| Study on Existing Forms and Drying Characteristics of Internal Water in Paper Web |
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| DOI：10.11981/j.issn.1000-6842.2019.01.55 |
| Key Words:paper drying; drying characteristics; LF-NMR |
| Fund Project:浙江省自然科学基金/青年基金项目（LQ18B060003）；广东省绿色化学产品技术重点实验室开放基金资助项目（GC201809）。 |
| Author Name | Affiliation | | CHEN Xiaobin1,* | 1.College of Chemical and Material Engineering, Quzhou University, Quzhou, Zhejiang Province, 324000 | | DONG Yunyuan1 | 1.College of Chemical and Material Engineering, Quzhou University, Quzhou, Zhejiang Province, 324000 | | ZHENG Qifu1 | 1.College of Chemical and Material Engineering, Quzhou University, Quzhou, Zhejiang Province, 324000 | | MAN Yi2 | 2.State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | | LI Jigeng2 | 2.State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 | | LIU Huanbin2 | 2.State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640 |
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| Abstract: |
| In the current study, the existing forms of internal water in paper web and its drying characteristics during drying process were preliminarily explored by using LF-NMR detection technology.The experimental results showed: ①According to the different binding forces, there are three forms of internal water in paper web, i.e. free water, capillary water and bound water.②The bound water is very little (about 2%), and it is basically unchanged during drying process.The main evaporated water during paper drying process is free water and capillary water.Free water has little restraint and it is evaporated largely at the beginning of drying.Capillary water is strongly bound and evaporates rapidly after free water is evaporated completely.③According to the different forms of evaporating water, the drying process of paper can be divided into two stages i.e.free water drying stage (the moisture content of paper is greater than critical moisture content) and capillary water drying stage (the moisture content of paper is less than critical moisture content). |
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