Abstrakt

Surface active materials as an additive in nssc pulping of populus deltoids

Omid Ghaffarzadeh, Zeinolabedin Akhlaghi Amiri, Ahmad Reza Saraeian

Over the past few decades, several chemicals were identified by the researchers, which can improve pulp yield, when used as pulp additives. Beside the different pulping additives i.e.AQ, PS, NaBH­4 and etc., surfactants using has led to considerable results in pulping process. In this study, using of two surfactants was considered in NSSC pulping of poplar. Results showed a decrease in yield amount from 81.2 to 78.8with an increase in cooking time from 60 to 90 for the conventional pulping (without additives). In addition, for modified pulping, using of these two surfactants not only didnÂ’t improve the yield amount, but also it was diminished in comparison to control (less than %1); on the other hand, application of two both surfactants decreased the amount of lignin in soluble, too. Evaluation of handsheets indicated the negative effect of both surfactants application on the amount of breaking length and tear strength. But for RCT and CMT strength, a different trend was observed; In the contrary to PEG 1500 (code 8) application of the effect of ELA-7 enhanced value. Finally, surfactant application has caused to increase caliper and bulk value which is consistent with the enhancement of air resistance amount.