| 何 晶,陈树润,沙九龙,王 晨,张 辉.CMC对漂白针叶木浆悬浮液屈服应力的影响及其应用[J].中国造纸学报,2017,32(1):27-31 |
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| CMC对漂白针叶木浆悬浮液屈服应力的影响及其应用 |
| Influence of the Addition of CMC on the Yield Stress of NBKP Suspension and Its Application in Pulp Transporting and Mixing |
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| DOI：10.11981/j.issn.1000-6842.2017.01.27 |
| 中文关键词: 漂白针叶木浆 CMC 纤维悬浮液 屈服应力 能量耗散因子 |
| Key Words:needles of bleached kraft pulp (NBKP) CMC fiber suspension yield stress energy dissipation factor |
| 基金项目:南京林业大学江苏省制浆造纸科学与技术重点实验室开放基金（201609）；江苏高校优势学科建设工程资助项目(PAPD)。 |
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| 中文摘要: |
| 通过向漂白针叶木浆中添加CMC来改善纸浆悬浮液的流变特性，并对纸浆悬浮液的屈服应力进行了研究。结果表明，在稳态剪切条件下，纸浆悬浮液的屈服应力τy随浆浓Cm的增大而迅速增大，两者符合指数关系τy=aCbm，且添加CMC不影响两者的指数关系；对于浓度一定的纸浆悬浮液，随CMC添加量的增加，纸浆悬浮液的屈服应力先减小后增大，当添加相对绝干浆质量约1.5%的CMC时，纸浆悬浮液的屈服应力显著减小；随浆浓的增大，CMC对其屈服应力的影响也越来越显著，向浆浓为4%的漂白针叶木浆中添加1.5% CMC时，纸浆悬浮液的屈服应力下降最多，降低了16.2%，且纸浆的搅拌能耗明显降低，降低约40.6%；此外，添加CMC会降低纸浆初始流态化时的能量耗散因子εF，使得纸浆更易于输送。实验结果可为漂白针叶木浆的输送、筛选和混合等过程的工艺节能降耗和装备技术研发与优化提供理论依据。 |
| Abstract: |
| Improvement of the rheological properties, including the yield stress, of the needles of bleached kraft pulp (NBKP) suspension was studied through adding CMC. Results showed that the yield stress increased rapidly with the pulp suspension concentration increasing under steady-state shear conditions, followed an exponent equation, and adding CMC did not affect the relationship. For a given concentration of the pulp suspension, its yield stress would increase firstly and, then, reduce with the increase of CMC dosage, and when adding 1.5% CMC (on oven dry pulp), the yield stress reduced most significantly. With the pulp suspension concentration increasing, the impact of adding CMC on the yield stress was more and more obvious, and when 1.5% of CMC was added into the pulp of 4% concentration, the yield stress reduced the most, reaching 16.2%, which could significantly reduce the energy consumption of the pulp agitation up to about 40.6%. Adding CMC might also reduce the energy dissipation factor at the onset of pulp suspension fluidization, which made it easier to be transported. |
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