Effects of Biopulping on Optical Properties of Chemical Mechanical Pulping Unbleached from Hornbeam Wood

Document Type : Original Article

Authors

1 Department of Wood and Paper Science & Technology, Savadkooh Branch, Islamic Azad University, Savadkooh, Iran

2 Department of Wood Industry, Technical and Vocational University (TVU), Tehran, Iran

Abstract

In this study, optical properties of paper obtained from treatments 1, 2 and 4 weeks with the fungus Phanerochaete chrysosporium BKM - 1767 was evaluated and compared with control samples. After preparing fungal specimens, hornbeam chips three levels 1, 2 and 4 weeks under laboratory conditions were treated. To Chemical Mechanical Pulping from chips treated, 165oC baking temperature, cooking time 80 and 90 minutes and the percentage of sodium sulfite chemicals: 14, 18 and 22 percent compared to the cooking liquid to chips 7 to 1 was considered. In the case of brightness, the duration of treatment is also an important factor for increasing the effect of fungal treatment. The decrease in brightness in the 4-week treatment is significant. This point indicates that in the case of hornbeem, the effect of the fungal treatment on the brightness of the paper occurs only in the 4-week treatment. More increase of yellowness in 2 and 4 week treatments shows that the effectiveness of hornbeem in relation to the yellowness factor occurs with increasing the duration of fungal treatment. The opacity of the papers obtained from the treated wood chips has almost increased, but there is no significant difference between the opacity of the papers prepared in the control treatment and the opacity of the papers prepared in the fungal treatments.

Keywords

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History

  • Receive Date: 26 August 2022
  • Revise Date: 23 January 2023
  • Accept Date: 24 January 2023

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