Unbleached and bleached handsheet characteristics of Subabul heartwood and sapwood

Author:

Pydimalla Madhuri12,Adusumalli Ramesh Babu1ORCID

Affiliation:

1. Department of Chemical Engineering , Hyderabad Campus , 29794 BITS , Pilani , Hyderabad , India

2. Chaitanya Bharathi Institute of Technology , Gandipet , Hyderabad , India

Abstract

Abstract The objective of this study was to understand the influence of bleaching on % residual lignin, water retention value, brightness and morphological properties of Subabul heartwood and sapwood pulps. The second aim was to compare the properties of unbleached and bleached handsheets with respect to tensile index and fractography. Screened wood chips of Subabul were subjected to kraft cooking (165 °C, 3 hours) followed by ECF bleaching and refining. When unbleached handsheets were compared, higher tensile index was found for sapwood sheets (29.8 N.m/g) than heartwood sheets (12.8 N.m/g). Therefore, it is recommended to use unbleached sapwood sheets for packaging grade applications. The bleached pulps have exhibited negligible residual lignin (0.1 %), higher water retention value (∼21) and higher brightness (88 %) compared to unbleached pulps. Subsequently, the bleached heartwood sheets revealed higher tensile index (∼7 fold) and higher modulus of elasticity (∼2.7 fold) compared to unbleached heartwood sheets. For printing grade applications bleached sapwood and bleached heartwood pulps are equally recommended, because no differences were observed in their pulp and sheet characteristics.

Publisher

Walter de Gruyter GmbH

Subject

General Materials Science,Forestry

Reference37 articles.

1. Adusumalli, R.B., Mook, W., Passas, R., Schwaller, P., Michler, J. (2010a) Nanoindentation of single pulp fibre cell walls. J. Mater. Sci. 45:2558–2563.

2. Adusumalli, R.B., Raghavan, R., Schwaller, P., Zimmermann, T., Michler, J. (2010b) In-situ SEM micro-indentation of single wood pulp fibres in transverse direction. J. Electron Microsc. 59:345–349.

3. Antonsson, S., Mäkelä, P., Fellers, C., Lindström, M.E. (2009) Comparison of the physical properties of hardwood and softwood pulps. Nord. Pulp Pap. Res. J. 4:409–414.

4. Atac, Y., Eroǧlu, H. (2013) The effects of heartwood and sapwood on kraft pulp properties of Pinusnigra J.F.Arnold and Abiesbornmuelleriana Mattf. Turk. J. Agric. For. 37:243–248.

5. Bal, B.C., Bektas, I. (2013) The mechanical properties of heartwood and sapwood of flooded gum (Eucalyptus grandis) grown in Karabucak, Turkey. J. For. Res. 9:71–76.

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3