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| Influence of the Pulp Consistency and Addition of Retention and Drainage Aids on the Yield Stress of Eucalyptus Pulp Fiber Suspension |
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| DOI：10.11981/j.issn.1000-6842.2019.03.38 |
| Key Words:eucalyptus pulp; fiber suspension; yield stress; CPAM; cationic starch |
| Fund Project:“十三五”水体污染控制与治理国家科技重大专项（2017ZX07402004）；江苏高校优势学科建设工程资助项目(PAPD)。 |
| Author Name | Affiliation | | ZHANG Xiaoxue | Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037
Jiangsu CoInnovation Center for Efficient Processing and Utilization of Forest Resources， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037
Jiangsu Lee & Man Paper Manufacture Limited， Changshu， Jiangsu Province， 215536 | | WANG Chen | Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037
Jiangsu CoInnovation Center for Efficient Processing and Utilization of Forest Resources， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 | | SHEN Jun | Jiangsu Lee & Man Paper Manufacture Limited， Changshu， Jiangsu Province， 215536 | | ZHANG Hui | Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037
Jiangsu CoInnovation Center for Efficient Processing and Utilization of Forest Resources， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 |
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| Abstract: |
| The yield stress （τy） of pulp fiber suspension is a key rheological parameter. The influence of consistency （Cm） of eucalyptus bleached kraft pulp， the amounts of addition of CPAM or cationic starch on τy of the eucalyptus pulp fiber suspension was studied. The results showed that， in the steady state shear condition， the τy of eucalyptus pulp fiber suspension increased rapidly with the increase of Cm， their relationship was accorded with the exponential relation τy=aCbm（a=3.20， b=2.62）. After adding CPAM or cationic starch to eucalyptus pulp fiber suspension， the exponential relation was still satisfied， but the values of a and b changed. After adding CPAM， a would decrease， and b would go up. After adding cationic starch， both a and b floated up and down on the original basis. For eucalyptus pulp fiber suspension with certain Cm， the τy would first increase then decrease with the increase of CPAM addition, but the τy was still stronger than the τy of blank pulp fiber suspension. The τy of eucalyptus pulp fiber suspensions increased by up to 30% when Cm was 4.0% and the CPAM addition amount was about 0.6%. With the addition of cationic starch， the τy of eucalyptus pulp fiber suspension increased first then decreased. When the amount of cationic starch was about 2.5% and Cm was 4.0%， the τy of eucalyptus pulp fiber suspension decreased by 25.4%. |
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