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| Study on the Enrichment Mechanism of Suspended Substances and Viscosity Reduction of Papermaking Reconstituted Tobacco Coating Liquid |
| Received:October 19, 2021 |
| DOI：10.11981/j.issn.1000-6842.2022.02.65 |
| Key Words:papermaking reconstituted tobacco;coating liquid;solids;viscosity reduction;dispersants |
| Fund Project:河南卷烟工业烟草薄片有限公司科技项目（2021410010340055）。 |
| Author Name | Affiliation | Postcode | | LUO Langman* | Tianjin Key Lab of Pulp ＆ Paper， Tianjin University of Science ＆ Technology， Tianjin， 300457 | 300457 | | LI Jin | He'nan Cigarette Industrial Tobacco Sheet Co.， Ltd.， Xuchang， He’nan Province， 461100 | 461100 | | YAN Ying | He'nan Cigarette Industrial Tobacco Sheet Co.， Ltd.， Xuchang， He’nan Province， 461100 | 461100 | | ZHANG Weifeng | Tianjin Key Lab of Pulp ＆ Paper， Tianjin University of Science ＆ Technology， Tianjin， 300457 | 300457 | | GENG Shao | Tianjin Key Lab of Pulp ＆ Paper， Tianjin University of Science ＆ Technology， Tianjin， 300457 | 300457 | | LUO Chong* | He'nan Cigarette Industrial Tobacco Sheet Co.， Ltd.， Xuchang， He’nan Province， 461100 | 461100 | | WEN Yangbing | Tianjin Key Lab of Pulp ＆ Paper， Tianjin University of Science ＆ Technology， Tianjin， 300457 | 300457 |
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| Abstract: |
| The viscosity of coating liquid from coating process of papermaking reconstituted tobacco was tested and the chemical composition of centrifuged solid substances in the coating liquid was analyzed. The viscosity increasing phenomenon of reflux coating liquid was studied to reveal the cause of enrichment in suspended substance， and the solution to viscosity reduction of reflux coating liquid was proposed. The results showed that reflux coating liquid with higher solid content than that of its fresh counterpart mainly composed of carbon-containing substance， with average particle size of 1~2 µm， Ca content of 37%. Fine components in the substrate with weak bonding strength which renders their peeling off into reflux coating liquid and excessive Ca content in the liquid are the main causes of its increased viscosity. While when 0.1% polyethylene glycol 400 was added to the reflux coating liquid， the viscosity decreased from 416.4 to 243.5 mPa·s， and the average particle size from 0.339 to 0.116 µm. |
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