中浓压力筛在烟草薄片生产中的应用

Application of Medium-consistency Pressure Screen in Reconsitituted Tobacco Production

关键词:  中浓压力筛  烟草薄片  浆料均匀度  运行稳定性

Key Words:medium-consistency pressure screen  reconsitituted tobacco  evenness of the pulp fiber  operational stability

摘要:介绍了中浓压力筛在烟草薄片制浆工序的应用必要性，总结了外流式中浓压力筛在烟草薄片生产中的调试及试运行情况。结果表明，外流式中浓压力筛的进浆浓度、进浆与良浆压差、尾浆流量、尾浆浓度、良浆浓度是影响筛机正常运行的关键参数。在保持原打浆工艺不变的条件下，采用外流式中浓压力筛对打浆后浆料进行筛选后，过短、过长纤维在总纤维中的占比减小，浆料纤维分布集中度、均匀度显著增加；浆料纤维长度＜20目和80～300目的百分比分别降低了19.0%、50.6%；20～50目和50～80目的百分比分别增加了42.5%、10.2%；浆料平均打浆度增幅33.8%，浆料平均湿重降幅19.8%；基片定量及烟草薄片定量、厚度、涂布率变化幅度较小，均不超过±1.5%，抗张强度增幅达19.4%，为减少纸机断纸次数、增加纸机及整个生产系统的运行稳定性提供了保障。

Abstract:The necessity of the application of medium-consistency pressure screen in reconsitituted tobacco papermaking process was introduced. The debugging and trial operation of medium-consistency pressure screen in the process of making reconsitituted tobacco were summarized， it revealed that the concentration of the pulp entering into the pressure screen， the pressure difference of the entering pulp and the accepted pulp of the pressure screen， the flow rate of the tailings， the consistencies of the accepted pulp and the tailings played an important role in steady operation of the pressure screen. The pulp after beating under the same condition was received， the proportion of too long or too short fiber in the received pulp was reduced， the fiber length distribution was improved significantly. The percentage of the fiber retained in 20 mesh and in between 80～300 mesh decreased by 19.0%， 50.6%， respectively. The percentage of the fiber in between 20～50 mesh and in between 50～80 mesh increased 42.5%， 10.2%， respectively， beating degree of the pulp increased 33.8%， wet weight of the pulp decreased 19.8% after receiving， the variation of the basis weight， thickness， coated rate of the reconsitituted tobacco was no more than ±1.5%， tensile strength of reconsitituted tobacco increased 19.4% which was of benefit to reduce paper break times， increasing operational stability of the paper machine and the production efficiency．