打筛模式在造纸法再造烟叶生产中的应用实践

Application and Practice of Refining-Screening Mode in Reconstituted Tobacco Production by Papermaking

关键词:  中浓压力筛  低打浆度  高湿重  高吸收性

Key Words:medium concentration pressure screen  low refining degree  high wet weight  high absorbability

摘要:采用中浓压力筛与回流立管的组合形式，对传统再造烟叶浆料的处理模式进行了系统性优化，由单一的“打浆”模式升级为“打筛”模式。在保证浆料匀度的前提下，实现了“低打浆度，高湿重”的浆料处理预期，其中压力筛出口良浆打浆度从46°SR降至34°SR，降幅26.1%；湿重从3.1 g提升至4.1 g，升幅32.3%。由此浆料生产得到的基片透气度从2300~2500 mL/min提升至4000~4200 mL/min，提升幅度超过70.0%，匀度指数从342提升至371，提升幅度为9.1%，基片正面静摩擦力从93 N提升至112 N，提升幅度为20.4%，接触角变化速率从2.8°/s提升至4.6°/s，提升幅度为64.3%。按7500 t的年产量计算，打筛模式的制浆能耗成本可降低36.41万元/a。

Abstract:The processing mode of reconstituted tobacco pulp was optimized from traditional refining mode to refining-screening mode through the combining form of medium concentration pressure screen and backflow stand pipe. Based on the ensurance of pulp uniformity， the refining-screening mode realized low refining degree and high wet weight of pulp. The results showed that compared with traditional refining mode， the refining degree of finished pulp decreased from 46°SR to 34°SR， decreasing by 26.1%； wet weight increased from 3.1 g to 4.1 g， increasing by 32.3%； the air permeance of substrate increased from 2300~2500 mL/min to 4000~4200 mL/min， increasing by more than 70%； uniformity index increased from 342 to 371， increasing by 9.1%； static friction of the front of base sheet increased from 93 N to 112 N， increasing by 20.4%； instant absorbability increased from 2.8°/s to 4.6°/s， increasing by 64.3%. Moreover， based on the annual output of 7500 t， the pulping energy cost under refining-screening mode could decrease by 0.3641 million CNY every year.