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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   winter 2018 , Volume 32 , Number 4 (61) ; Page(s) 473 To 485.

Investigation and comparison the properties of total chlorine free (TCF) and elemental chlorine free (ECF) bleached bagasse soda pulp

Author(s):  VAYSI R.*, BAGHERI A.R.
* Chalous Azad University, Iran
The objective of this research was to investigate the effects of total chlorine free (TCF) and elemental chlorine free (ECF) bleaching on optical and mechanical properties of bleached bagasse soda pulp. For this purpose, some unbleached bagasse soda pulp was randomly selected from Pars Paper industry. Then pulp was bleached with one, two or three stage sequences applying P, OP, OPY, O(Ep)P, EHP and O(Ep)H bleaching stages denoting oxygen(O), hydrogen peroxide(P), alkali extraction with hydrogen peroxide(Ep), sodium hypochlorite(H) and sodium dithionite(Y). The hand sheets with 70 gr/m2 were prepared from the above-mentioned bleached pulps, and then the optical and mechanical properties were measured using TAPPI standard test methods and compared. The results showed that brightness, greenness, tear (except EHP stages), tensile, burst, breaking length strengths and folds were increased and opacity and a* factor were decreased by ECF and TCF bleaching sequences. The effects of TCF bleaching sequence were more sensible than ECF bleaching sequence in improving bagasse soda pulp properties. In general, role of three stage OPY and O(Ep)H and two stage OP bleaching were better than EH(control) and unbleached bagasse soda pulps mill in improving brightness and paper strengths.
Keyword(s): Soda pulp,bagasse,bleaching stage,ECF,TCF,optical,mechanical properties
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