The Viscosity of Aqueous Suspensions of Cellulose Fibres: Part 2. Influence of Temperature and Mix Fibres

• Main Author: Ferreira,Abel G.M.
• Publication Date: 2003
• Other Authors: Silveira,Maria Teresa, Lobo,Lélio Q.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-63522003000100004
• topic: viscosity; suspensions; eucalypt; pine; consistency; fibre length; temperature

Measurements were made of the viscosity of aqueous fibre suspensions of bleached kraft pulps from eucalyptus and pine trees over the temperature range 15 to 75ºC and consistencies from 0.20 to 1.00 mass per cent. In addition, the viscosity of mixed aqueous suspensions of eucalyptus and pine cellulose fibres was measured at 25ºC, varying the mass fraction of short fibres (from eucalyptus) and long fibres (from pine) from 0.25 to 0.75 for consistencies ranging from 0.05 to 0.70 per cent. The viscosities of the mixed suspensions can be shown to be the mass average of the viscosities of the aqueous suspensions of the two species. Correlations describing the dependency of viscosity on temperature and on consistency were established for both species.