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Study and modeling of the desintegration kinetics of coated paper

The disintegration of recovered paper is the first operation in the preparation of recycled pulp. It is known that the defibering process follows a first order kinetics from which it is possible to obtain the disintegration kinetic constant (KD) by means of different ways. The disintegration constant can be obtained from the Somerville index results (%lsv and from the dissipated energy per volume unit (Ss). The %slv is related to the quantity of non-defibrated paper, as a measure of the non-disintegrated fiber residual (percentage of flakes), which is expressed in disintegration time units. In this work, disintegration kinetics from recycled coated paper has been evaluated, working at 20 revise rotor speed and for different fiber consistency (6, 8, 10, 12 and 14%). The results showed that the values of experimental disintegration kinetic constant, Ko, through the analysis of Somerville index, as function of time. Increased, the disintegration time was drastically reduced. The calculation of the disintegration kinetic constant (modelled Ko), extracted from the Rayleigh’s dissipation function, showed a good correlation with the experimental values using the evolution of the Somerville index or with the dissipated energy

North Carolina State University. Department of Wood and Paper Science, College of Natural Resources

Author: Vilaseca Morera, Fabiola
Puig Serramitja, Josep
Pèlach Serra, Maria Àngels
El Mansouri, Nour-Eddine
Alcalà Vilavella, Manel
Roux, Jean-Claude
Mutjé Pujol, Pere
Abstract: The disintegration of recovered paper is the first operation in the preparation of recycled pulp. It is known that the defibering process follows a first order kinetics from which it is possible to obtain the disintegration kinetic constant (KD) by means of different ways. The disintegration constant can be obtained from the Somerville index results (%lsv and from the dissipated energy per volume unit (Ss). The %slv is related to the quantity of non-defibrated paper, as a measure of the non-disintegrated fiber residual (percentage of flakes), which is expressed in disintegration time units. In this work, disintegration kinetics from recycled coated paper has been evaluated, working at 20 revise rotor speed and for different fiber consistency (6, 8, 10, 12 and 14%). The results showed that the values of experimental disintegration kinetic constant, Ko, through the analysis of Somerville index, as function of time. Increased, the disintegration time was drastically reduced. The calculation of the disintegration kinetic constant (modelled Ko), extracted from the Rayleigh’s dissipation function, showed a good correlation with the experimental values using the evolution of the Somerville index or with the dissipated energy
Document access: http://hdl.handle.net/2072/206310
Language: eng
Publisher: North Carolina State University. Department of Wood and Paper Science, College of Natural Resources
Rights: Tots els drets reservats
Subject: Paper vell -- Reciclatge
Waste paper -- Recycling
Cinètica química
Chemical kinetics
Paper -- Deterioració
Paper -- Deterioration
Pasta de paper
Wood-pulp
Estucament del paper
Paper coating
Title: Study and modeling of the desintegration kinetics of coated paper
Type: info:eu-repo/semantics/article
Repository: Recercat

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