Search for dissertations about: "Dissolving pulp"

Showing result 16 - 20 of 31 swedish dissertations containing the words Dissolving pulp.

2. 16. Model studies of cellulose fibers and films and their relation to paper strength

   Author : Susanna Fält; KTH; []
   Keywords : absorption; carboxymethyl cellulose; cellulose fibers; dissolving pulps;

   Abstract : The objectives of this work were (i) to develop a new methodfor the preparation of thin cellulose model films, (ii) to usethese model films for swelling measurements and (iii) to relatethe swelling of fibers and films to the dry strength ofpaper.In the new film preparation method, NMMO(N-methylmorpholine-N-oxide) was used to dissolve cellulose andDMSO (dimethyl sulfoxide) was added to control the viscosity ofthe cellulose solution. READ MORE

4. 17. Conversion of Wood and Non-wood Paper-grade Pulps to Dissolving-grade Pulps

   Author : Viviana Köpcke; Monica Ek; Herbert Sixta; KTH; []
   Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Wood fibre and forest products; Träfiber- och virkeslära;

   Abstract : Dissolving-grade pulps are commonly used for the production of cellulose derivatives and regenerated cellulose. To obtain products of high quality, these so-called "special" pulps must fulfill certain requirements, such as high cellulose content, low hemicellulose content, a uniform molecular weight distribution and high cellulose reactivity. READ MORE

5. 18. From recovery boiler to integration of a textile fiber plant : Combination of mass balance analysis and chemical engineering

   Author : Hans Magnusson; Ulf Germgård; Gunnar Henriksson; Hans Theliander; Karlstads universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; kraft pulping; recovery boiler; smelt properties; non-process elements; oxygen delignification; viscose manufacturing; integrated production; regenerated cellulose; sulfatmassa; fysikaliska egenskaper; smälta; sodapanna; processfrämmande ämnen; bioraffinaderi; integrerad produktion; regenererad cellulosa; Chemical Engineering; Kemiteknik;

   Abstract : Modern chemical technology is an efficient tool for solving problems, particularly within the complex environment of the pulp and paper industry, and the combination of experimental studies, mill data and mass balance calculations are of fundamental importance to the development of the industry. In this study various examples are presented, whereby chemical technology is of fundamental importance. READ MORE

6. 19. Structural changes during cellulose composite processing

   Author : Helena Halonen; Monica Ek; Tommy Iversen; Derek D. Gray; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; CP MAS 13C NMR; cellulose; fibril aggregation; biocomposite; compression moulding; supramolecular structure;

   Abstract : Two approaches for creating a new all-cellulose composite material have been studied: the biosynthesis of compartmentalised bacterial cellulose fibril aggregates and the compression moulding of commercial chemical wood pulps processed with only water. The objective was to study the structural changes during processing and the complexity of relating the mechanical properties of the final biocomposites to the nanoscale structure was highlighted. READ MORE

7. 20. Multivariate Analysis of 2D-NMR Spectroscopy : Applications in wood science and metabolomics

   Author : Tommy Öman; Mattias Hedenström; Bjart Frode Lutnaes; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; 2D NMR; HSQC; cellulose; ligning; STOCSY; HSQC-STOCSY; crystallinity; biologisk kemi; biological chemistry;

   Abstract : Wood is our most important renewable resource. We need better quality and quantity both according to the wood itself and the processes that are using wood as a raw material. Hence, the understanding of the chemical composition of the wood is of high importance. READ MORE