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Production
Published in Wanda Grimsgaard, Design and Strategy, 2023
Woodfree paper properties include high strength and excellent performance. It is also age-resistant, which means, among other things, that it does not lose its structure over time or turn yellow nearly as fast as wood-containing paper. It is important, for example, when printing artworks, art catalogues or books to maintain consistent representation of colours of the image and the whiteness of the paper. A woodfree paper can fulfil the requirements of permanent paper, if it does not contain mechanical fibres. Wood-containing paper has good strength, good opacity and a natural feel to it, and is often considered a more environmentally friendly paper.19 Wood-containing paper has a lifespan of up to 50 years, while woodfree paper has a lifespan of more than a hundred years. Lifespan also depends on storage conditions
Felt, bark and other nonwovens
Published in Michael Hann, Textile Design, 2020
Paper is a thin writing surface created from pulped cellulose fibres (invariably from wood). After pressing and drying, flexible sheets are formed that may be used as writing or printing surfaces, or as packaging material of various kinds. Attested by various archaeological finds, paper was invented in China during the second century CE. Further information was provided by Monro (2014).
Characterization of kraft pulp delignification using sodium dithionite as bleaching agent
Published in Chemical Engineering Communications, 2020
Jishnu Krishnan, Susmith Sunil Kumar, R. Krishna Prasad
In the pulping process most of the lignin is removed as soluble fraction which gives unbleached pulp constituting cellulose, hemicelluloses and residual lignin. Lignin causes yellowing of paper with time and hence must be removed prior to manufacture of paper. The bleaching process decolorizes and even removes the residual lignin. The bleaching process is of high importance as bleached pulp constitutes 80% of the products produced by paper and pulp industry (Dence and Reeve, 1996).