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Yu D.,South China University of Technology | Zeng J.-S.,South China University of Technology | Chen K.-F.,South China University of Technology | Feng Y.-C.,South China University of Technology | And 2 more authors.
BioResources | Year: 2015

This paper presents a novel device based on an oscillating torsion resonator with continuously varying frequency capability to characterize the rheological properties of pulp fiber suspensions in a concentrated regime. Fiber suspensions made from unbleached wheat straw pulp at concentrations ranging from 5 wt% to 15 wt% were used. Pulp suspensions exhibit shear-thinning behavior up to a limited frequency value, after which Newtonian behavior prevails. Effects of frequency, fiber concentration, and beating process on suspension viscoelastic properties are discussed. The suspensions at different concentrations are structured in a similar way, leading to a weak gel-like structure. The storage modulus (G') of the suspension can be determined by a two-region (shear increasing - shear decreasing) profile, while loss modulus (G'') keeps increasing for the whole frequency range investigated. At the same frequency, G' and G'' increase nonlinearly with fiber concentration. The beating process brings a decrease in both G' and G''. The power-law model is used for data fitting. Source


Yang X.,Hangzhou Project and Research Institute of Electromechanical in Light Industry | Yang X.,South China University of Technology | Chen K.-F.,South China University of Technology
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2010

The paper discusses the constitution, cause and analyzing method-two-factor variance analysis of basis weight variance. The key point is that based on Bernoulli equation, setting a new variable-x that is the ratio of inlet and outlet flux to greatly simplify the solution of Bernoulli equation in order to compare and analyze the principle, characters and influence factors, etc of regulating cross basis weight profile with dilution water control. The result exactly meets practical situation. Source


Yang W.-F.,Hangzhou Project and Research Institute of Electromechanical in Light Industry | Ma D.-Q.,Hangzhou Project and Research Institute of Electromechanical in Light Industry | Zhang R.-Q.,Hangzhou Project and Research Institute of Electromechanical in Light Industry
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2012

This paper introduced the basic structure of crescent paper machine and the character of its vacuum system. Some basic principles of typical configuration and process design of the vacuum system were discussed. The selection and maintenance program of the vacuum system equipment were suggested. Source

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