ruwoldt, jost chinga-carrasco, gary tanase-opedal, mihaela
The aim of this study was to investigate new materials from organosolv fibers, organosolv lignin, kraft fibers, and their blends. The organosolv fibers showed reprecipitated lignin on the surface, a comparably low fiber length of 0.565 mm on average, and a high fines content of 82.3%. Handsheets were formed and thermopressed at 175 °C and 50 MPa, y...
Germgård, Ulf Sjöstrand, Björn Fiskari, Juha
Screening of pulp can be expressed as a process where solid contaminants are removed from a pulp slurry without an excessive loss of fibres of acceptable quality. The impurities originate from the feedstock, or they are generated during the transport, handling, storage, or pulping process. The most typical impurities include bark, fibre bundles or ...
Vera-Loor, Andrea Marlin, Nathalie Mortha, Gérard
International audience
Ferreira, A Cláudia S Aguado, Roberto Bértolo, Raquel Carta, Ana M M S Murtinho, Dina Valente, Artur J M
Published in
Chemicke zvesti
Tissue paper was the only paper grade whose consumption increased during 2020 in Europe. In a highly competitive context, this work explores a strategy based on bisacrylamide cross-linkers and poly(vinyl alcohol) (PVA), seeking to enhance the water uptake of pulps for tissue paper and the key properties of the resulting tissue sheets: water absorpt...
Bengtsson, Andreas
Carbon fibers (CFs) have excellent mechanical properties and a low density, making themattractive as a reinforcing fiber in composites. The use of CFs is limited to high-end applications,since they are produced from an expensive fossil-based precursor via an energy-intensivemanufacturing process, explaining the need for cheaper CFs from renewables....
Sarosi, Oliver P Bammer, Daniela Fitz, Elisabeth Potthast, Antje
Published in
Carbohydrate polymers
Electron beam irradiation (EBI) is an alternative treatment for intrinsic viscosity (IV) control in cellulose pulps, but has never been integrated in full bleaching sequences for comparison to conventional methods. Both eucalyptus kraft (EK) paper pulp and beech sulfite (BS) dissolving pulp were subjected to totally chlorine free (TCF) bleaching se...
Golestani, Jahan
Hemicelluloses are valuable sources of polysaccharides constituting 20-30% of wood. Since the nature and quantities of hemicelluloses vary in different tree species, their valorization is challenging. Kraft pulps still contain 15 to 30% of hemicelluloses. Among different chemical processes for removing hemicelluloses from kraft pulps, the most appl...
Nygren, Alexander
Brightness reversion, also known as yellowing, is a well-known phenomenon which means that the brightness of paper products decreases during ageing. The name of this phenomenon is based on that paper products usually change in color towards yellow during ageing. Yellowing is considered to occur due to a mixture of chemical and physical factors, whi...
Bengtsson, Andreas Bengtsson, Jenny Sedin, Maria Sjöholm, Elisabeth
There is an increasing demand for lightweight composites reinforced with carbon fibers (CFs). Due to its high availability and carbon content, kraft lignin has gained attention as a potential low-cost CF precursor. CFs with promising properties can be made from flexible dry-jet wet spun precursor fibers (PFs) from blends (70:30) of softwood kraft l...
Khaldi, Zineb
La contamination des surfaces par des bactéries et l’émergence de souches résistantes aux antimicrobiens sont des problèmes très préoccupants dans différents domaines tel que les domaines hospitalier et alimentaire. Cette contamination commence par l’adhésion de bactéries pathogènes sur une surface jusqu’à la formation de biofilms. Ces derniers con...
