and objectives: Paper making industries to supply their raw material and also aims to reduce the pressure on wood consumption, to find and to use other sources of cellulosic fibers such as bagasse, straw, reeds and recovery of cellulosic fibers used (RECYCLED FIBERS). Many paper-producing countries, is now collecting and recycling paper and even import waste paper from other countries have taken action. Successful development requires a delignification process technology can take advantage of

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... l the potential raw material. The selectivity of the delignification and bleaching prerequisite to achieve greater efficiency and optical characteristics and is suitable resistance. Although the process of Soda and Soda-AQ is good, but the use of high alkalinity is in the process of degradation of carbohydrates. In this study the effectiveness of an oxygen delignification stage before bleaching ECF method to reduce the use of chemicals sequences were evaluated. Materials and Methods: Due to the high amount of lignin in the fibers of old corrugated Carton; soda-AQ pulping process was used for the initial delignification. Two treatments were selected to compare the effects of oxygen on reducing the bleaching process So that a treatment without oxygen delignification using the sequence AD1EpD2P delignification with oxygen and other treatments using the sequence AD1EpD2 equal terms, they were bleached. Results: The use of an oxygen delignification stage a dramatic decrease in the amount of kappa number and showed a slight drop of yield OCC pulp. Conclusion: The results show that using an oxygen delignification stage, can be used the unbleached pulp kappa number with greater efficiency and after treatment *Corresponding author: Ahmadi_302@yahoo.com ‫ﭘﮋوﻫﺶ‬ ‫ﻧﺸﺮﯾﻪ‬ ‫ﭼﻮب‬ ‫ﻓﻨﺎوري‬ ‫و‬ ‫ﻋﻠﻮم‬ ‫ﻫﺎي‬ ‫ﺟﻨﮕﻞ‬ ‫و‬) ‫ﺟﻠﺪ‬ 23 (، ‫وﯾﮋه‬ ‫ﻧﺎﻣﻪ‬) 1 (1395 312 with oxygen, more yield and kappa number of similar (less than three) receipts and Finally, this pre-treatment did not cause a significant impact on the final bleached pulp strength properties As well as using oxygen delignification bleaching process can be less detecting the optical properties reached a similar conclusion in other words using a certain sequence, provided good optics.