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kappa number
Items for "kappa number"
Voltammetric analysis of the bleachability of softwood kraft pulps
Kraft and oxygen delignified pulps with various kappa numbers were prepared from black spruce and western hemlock chips...
Keywords: bleachability, ECF bleaching, electrochemical analysis, kappa number, kraft pulp, lignin, reactivity, Redox potential, softwood, Voltammetry
10/2004 | Holzforschung, Walter de GruyterChanges in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification
Three kraft pulps in the kappa number range between 50 and 20 and the same pulps oxygen-delignified to similar lignin contents (kappa approximately 6) were analyzed for lignin-carbohydrate complexes (LCC) by a method based on selective enzymatic hydrolysis of the cellulose, and quantitative fractionation of the LCC...
Keywords: bleachability, kappa number, kraft pulping, lignin-carbohydrate complex (LCC), oxygen delignification, residual lignin, specific absorptivity
10/2004 | Holzforschung, Walter de GruyterDislocations in Norway spruce fibres and their effect on properties of pulp and paper
Wood “cell-wall deformation” is a comprehensive term describing any physical dislocation in the wall caused by mechanical forces...
Keywords: cell wall, compression, kappa number, kraft cooking, scanning electron microscopy, tear index, tensile index
02/2005 | Holzforschung, Walter de GruyterHigh-consistency ozonation of hardwood kraft pulp
At present, ozone is one of the main chemicals in elemental chlorine-free (ECF) and totally chlorine-free (TCF) bleaching sequences...
Keywords: brightness, hardwood, hexenuronic acid groups, kappa number, Kinetics, kraft pulp, lignin, Ozone, shrinking core model, viscosity
11/2006 | Holzforschung, Walter de GruyterMolecular weight-functional group relations in softwood residual kraft lignins
An integrated picture of the distribution of functional groups should be provided as a function of molecular size within residual kraft lignins...
Keywords: delignification, kappa number, molecular weight, 31P NMR, residual kraft lignin
11/2005 | Holzforschung, Walter de GruyterEffect of abnormal fibres on the mechanical properties of paper made from Norway spruce, Picea abies (L.) Karst.
The aim of the present study was to determine the effect of a variety of abnormal fibres on the mechanical properties of paper made from Norway spruce,
Keywords: abnormal fibres, cell wall, compression, Dislocations, fertilisation, irrigation, kappa number, kraft cooking, tear index, tensile index, tensile strength
03/2008 | Holzforschung, Walter de Gruyter