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Browsing by Author "Bush, T"

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Acid bi-sulphite pulping effects on hardwoods and a softwood revealed by atomic force microscopy

Author: Chunilall, Viren ; Wesley-Smith, J ; Bush, T Date: Dec 2009 Wood fibres are the raw material used in the production of dissolving pulp for the manufacture of cellulose derivatives such as viscose and cellulose acetate. At the microscopic level, the wood cell wall is organised in layers with different ... Read more
Application of near-infrared spectroscopy to predict microfibril angle of 14-year-old Pinus patula

Author: Zbonak, A ; Bush, T Date: Sep 2006 An investigation was conducted to test the feasibility of near infrared spectroscopy (NIR) as a tool for predicting the microfibril angle (MFA) of solid wood samples of Pinus patula. Thirty 14 year-old trees were selected from three compartments ... Read more
Cellulose fibril aggregation studies of Eucalyptus dissolving pulps using atomic force microscopy

Author: Chunilall, Viren ; Wesley-Smith, J ; Bush, T Date: Nov 2006 Dissolving pulp is the end-product of acid-bisulphite pulping and bleaching processes, during which almost all non-cellulosic wood components are removed to produce dissolving pulp with final a cellulose purity of up to 96%. Dissolving pulp ... Read more
Cellulose fibril aggregation studies of eucalyptus dissolving pulps using atomic force microscopy

Author: Chunilall, Viren ; Wesley-Smith, J ; Bush, T Date: Nov 2006 The work presented will report on the use of AFM to study the CFA characteristics of dissolving pulp of a clone of Eucalyptus grown in compartments with contrasting growth rates (low and high), at different stages of the pulping process (solid ... Read more
Fractionation of high Kappa number kraft pulps of the South African softwoods and sulfonating of coarse fibre enriched fraction for production of sack paper

Author: Johakimu, Jonas K ; Bush, T Date: Mar 2011 The focus of this study was to seek an alternative way of manufacturing sack paper with uniform quality properties at increased refining energy efficiency compared to currently applied technologies. Kraft pulp produced at Kappa number ... Read more
Green liquor impregnation and Kraft pulping of South African Pinus Patula – “A practical approach to provide cost savings in a Kraft mill’s pulping operation”

Author: Johakimu, Jonas K ; Bush, T ; Lucia, L Date: Feb 2011 The effect of green liquor pre-treatment (GLP) on Kraft pulping of Pinus Patula has been investigated. Wood chips were pre-treated with green liquor, and subsequently subjected to Kraft pulping to achieve a target Kappa number of 65-70. The ... Read more
Investigating the lignocellulosic composition during delignification using confocal raman spectroscopy, cross-polarization magic angle spinning carbon 13 - nuclear magnetic resonance (CP/MAS 13C- NMR) spectroscopy and atomic force microscopy

Author: Chunilall, Viren ; Bush, T ; Erasmus, RM Date: Mar 2012 The changes in lignocellulosic composition of four hardwoods, i.e. Eucalyptus grandis camaldulensis (E. gc), E. grandis urophylla (E. gu), E. dunnii and E. nitens during different delignification processes were investigated using confocal ... Read more
Preliminary study on the potential of improving pulp quality and energy efficiency in a South African TMP mill

Author: Johakimu, Jonas K ; Bush, T Date: Sep 2010 Under the current mill refining practices, the mill is introducing too much refining energy into the fibre. The lower levels of freeness for the accept samples (18 vs. 90 CSF ml required) and the higher amounts of fines confirms this (Table ... Read more
Preliminary study on the potential of improving pulp quality and energy efficiency in a South African TMP mills

Author: Johakimu, Jonas K ; Bush, T Date: Mar 2010 The main focus of this work was to evaluate an opportunity for product quality and refining energy efficiency improvement through assessing the current mill practices in South African TMP mills. The fractionation trials were conducted at a ... Read more
Supra-molecular structure and chemical reactivity of cellulose I studied using CP/MAS (sup)13 C-NMR

Author: Chunilall, Viren ; Bush, T ; Larsson, PT Date: Aug 2013 In chemical pulping the components that keep wood cells together, mainly lignin are degraded and dissolved in order to obtain fibres for the dissolving pulp and paper processes. The aqueous solutions of pulping chemicals are transferred from ... Read more

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Browsing by Author "Bush, T"

Browsing by Author "Bush, T"

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