Published date: Aug 10 2022

Journal Title: KnE Materials Science

Issue title: 1st International FibEnTech Congress (FibEnTech21) – New Opportunities for Fibrous Materials in the Ecological Transition

Pages: 25–33

DOI: 10.18502/kms.v7i1.11605

Álvaro Vazavaz@ubi.ptFibEnTech, Chemistry Department, University of Beira Interior, R. Marquês de Ávila e Bolama, 6201-001 Covilhã, Portugal

João CoelhoFibEnTech, Chemistry Department, University of Beira Interior, R. Marquês de Ávila e Bolama, 6201-001 Covilhã, Portugal

Vera CostaFibEnTech, Chemistry Department, University of Beira Interior, R. Marquês de Ávila e Bolama, 6201-001 Covilhã, Portugal

Ana MarquesDepartment of Chemical Engineering, IST, University of Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal

Thaddeus MaloneyDepartment of Bioproducts and Biosystems, Aalto University, P.O. Box 11000 (Otakaari 1B), FI- 00076 Aalto, Finland

Phiri JosphatDepartment of Bioproducts and Biosystems, Aalto University, P.O. Box 11000 (Otakaari 1B), FI- 00076 Aalto, Finland

Paula PintoRAIZ – Forest and Paper Research Institute, Quinta de S. Francisco, 3800-783 Eixo, Aveiro, Portugal

Ricardo OliveiraRAIZ – Forest and Paper Research Institute, Quinta de S. Francisco, 3800-783 Eixo, Aveiro, Portugal

Rogério SimõesFibEnTech, Chemistry Department, University of Beira Interior, R. Marquês de Ávila e Bolama, 6201-001 Covilhã, Portugal

António SousaDepartment of Chemical Engineering, IST, University of Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal

Hardwood species have a complex cellular structure consisting of fibres, vessel elements and parenchyma cells with different chemical compositions. However, the presence of vessels with significant dimensions in their structure is a recurrent problem in the operation of industrial UWF paper printing. Since the 1980s, vessel picking and ink refusal are problems that paper professionals have tried to solve, but solutions for these have not yet been fully found. If vessels are concentrated in a stream, they can be pre-treated (e.g., by mechanical refining) and reincorporated into the pulp. Other strategies aim at vessel enzymatic and/or chemical passivation and sheet surface chemical treatment, altering the vessel adhesion to the fibre network. This requires vessel concentration at laboratorial level for proper chemical studies, such as FE-SEM, μ-XPS, TOF-SIMS and μFTIR. The main objective of our experimental study was to examine bleached kraft pulp E. globulus vessel and fibre composition. For this we performed EDX and μ-FTIR analysis on both fibre and vessel elements, and obtained the carbohydrate composition, the total acids content, the hexenuronic acids content and the zeta potential.

Keywords: E. globulus, vessel, EDX, μ-FTIR, sugar content, zeta potential

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