Properties of Bleached Alkaline Sulfite Anthraquinone Pulp from Old Corrugated Container

Document Type : Research Paper

Authors

1 M.Sc., Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, I.R. Iran

2 Professor, Departement of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, I.R. Iran

3 Assistant Professor, Departement of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, I.R. Iran

4 Assistant Professor, Cellulosic and Packaging Group, Iran Standard and Industrial Research Organization, Karaj, I.R. Iran

Abstract

The properties of alkaline sulfite anthraquinone (AS/AQ) pulp from old corrugated container (OCC)
was studied. In each trial 100 grams (based on dry weigth) of OCC and 18% active alkali was used.
Three levels of anthraquinone (0.0.1 and 0.2% based on dry weigth of the OCC) and two pulping
times (120 and 150 minutes at maximum pulping temperature) were applied. Pulping temperature,
Na2So3/NaOH ratio and liquor to OCC ratio at 170ºC,30/70 and 8/1 respectively were constant in all
pulping trials. The results showed that the effect of pulping temperature on pulp kappa number, AQ on
pulping yield and kappa number and the interactive effect of time and AQ on pulp yield and kappa
number were statistically significant at 99% level. The highest yield was reached applying pulping
condition of 18% active alkali,pulping time of 150 minutes pulping time without the addition of AQ
and the lowest kappa number was related to pulps produced applying 18% active alkali, 0.2% AQ and
150 minutes pulping time. The results of pulp strength measurements revealed that pulp produced
applying 18% active alkali, 150 minutes pulping time without AQ exhibited the highest tensile
strength index at 24.6 N.m/g and the highest tear strength index at 10.54 mN.m2/g was related to pulp
produced applying 18% active alkali, 150 minutes time and 0.2% AQ. Pulps produced applying 18%
active alkali, 150 minutes pulping time and 0.1% AQ was selected for elemental chlorine free (ECF)
bleaching applying D0EPD1 bleaching sequence and kappa factor of 0.35. The brightness, opacity and
yellowness of the bleached pulp were determined as 82.6%, 80.22% and 5.64% respectively. The
bleaching yield was measured as 92.1% (based in the dry weigth of unbleached pulp) and the tensile
strength and tear strength indices of bleached pulp were 17.88 N.m/g and 10.48 mN.m2/g respectively.

Keywords

References

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Forest and Wood Products
Volume 67, Issue 3 - Serial Number 3
October 2014
Pages 529-539

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