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Effect of cellulase-assisted refining on the thermal degradation of bleached high-density paper

  • Emilia Vänskä EMAIL logo and Tapani Vuorinen
Published/Copyright: March 4, 2015
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Abstract

Pulp was treated with cellulase, and the chemical, physical, and optical properties of the refined pulps in paper sheets were measured in terms of the degree of polymerization of cellulose, tensile strength, elongation, burst strength, light scattering, and brightness. The sheets were thermally treated for 20 and 60 min at 225°C in the presence of 1% and 75% (v/v) water vapor. The cellulase treatment intensified the fibrillation of fibers and reduced the specific energy consumption during refining. It was demonstrated based on the water retention value that the refining modified the water-bonding ability of the pulp fibers, which was further enhanced in the case of cellulase-treated pulps. However, the enzymatic pretreatment impaired the physical properties, such as the tensile strength, elongation, and burst strength of the high-density paper. These changes further reduced the thermal strength stability of the paper. In addition, considerable brightness loss of the cellulase-treated high-density paper was observed compared to the reference paper, indicating more severe thermal degradation reactions as a consequence of enzyme-assisted refining.


Corresponding author: Emilia Vänskä, Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland, Phone: +358503841635, e-mail:

Acknowledgments

The Finnish Funding Agency for Technology and Innovation (TEKES) and Metsä Fibre Oy are acknowledged for funding within the EffFibre Program of Finnish Bioeconomy Cluster FIBIC Ltd. Oy Banmark AB is thanked for providing the enzyme for refining. Mr. Esko Pekuri from Metsä Fibre Oy, Kemi mill (Finland) is thanked for viscosity measurements and valuable consulting during the pulp refining. We also thank Dr. Michael Hummel, Dr. Miro Suchy, Dr. Eero Hiltunen, M.Sc. Iina Solala, and M.Sc. Lasse Tolonen for fruitful discussions.

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Received: 2014-7-28
Accepted: 2015-2-6
Published Online: 2015-3-4
Published in Print: 2015-8-1

©2015 by De Gruyter

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