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Influence of Chemi-Mechanical Pulp Addition to Secondary Fibres upon Bending Stiffness
Authors: Potůček František | Gurung Bijay | Říhová Martina
Year: 2015
Type of publication: článek ve sborníku
Name of source: Proceedings of the 3rd International Conference on Chemical Technology
Publisher name: Česká společnost průmyslové chemie
Place: Praha
Page from-to: 296-301
Titles:
Language Name Abstract Keywords
cze Vliv přídavku chemicko-mechanické vlákniny k recyklovaným vláknům na ohybovou pevnost Cílem práce bylo vyšetřit, jak se změní pevnost v ohybu buničiny z recyklovaných vláken ve směsi s chemicko-mechanickou vlákninou získanou studeným neutrálním sulfitovým, alkalickým sulfitovým a natronovým postupem. Dosažené výsledky ukázaly, že přídavek chemicko-mechanické buničiny se projevil snížením pevnosti v ohybu, modulu elasticity a maximální křivosti v oblasti vratné deformace, stejně tak jako kritické křivosti v oblasti nevratné deformace. řepková sláma; studený natronový postup; recyklovaná vlákna; chemicko-mechanická vláknina; pevnost v ohybu
eng Influence of Chemi-Mechanical Pulp Addition to Secondary Fibres upon Bending Stiffness The aim of this study was to investigate bending stiffness characteristics for handsheets made of a blend of secondary fibres and chemi-mechanical pulp from rapeseed straw. To manufacture chemi-mechanical pulp, three cold processes, namely neutral sulphite, alkaline sulphite, and caustic soda, were applied under laboratory conditions. The chemi-mechanical pulping comprises four main operations, viz. chipping, grinding, leaching, and beating. The chemi-mechanical pulp was characterized by its average degree of polymerization which was measured in the range of 75 to 110 with respect to relatively great amount of low molecular substances presented in pulps prepared by cold pulping process. The results obtained showed that the addition of chemi-mechanical pulp to secondary fibres led to a decrease in the bending stiffness, bending modulus of elasticity in the region of reversible deformation, as well as in the maximum curvature in the region of reversible deformation, and in critical curvature in the region of plastic deformation. However, the bending modulus of elasticity and maximum curvature was found to be comparable with those measured for moulded fibre products in our previous studies. rapeseed straw; cold pulping process; secondary fibres; chemi-mechanical pulp; bending stiffness

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