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Bending stiffness for handsheets made of a blend of secondary fibres and chemi-mechanical pulp from rapeseed straw
Authors: Potůček František | Říhová Martina
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Acta Facultatis Xylologiae Zvolen
Page from-to: 89-95
Titles:
Language Name Abstract Keywords
cze Ohybová pevnost listů vyrobených ze směsi recyklovaných vláken a chemicko-mechanické vlákniny ze slámy řepky olejky Cílem práce bylo vyšetřit pevnostní charakteristiky listů o plošné hmotnosti 520 g m2 vyrobených ze směsi recyklovaných vláken a chemicko-mechanické vlákniny. Chemicko-mechanická vláknina ze slámy řepky olejky byla získána za laboratorních podmínek studeným neutrálně sulfitovým, alkalickým sulfitovým a natronovým postupem. Vedle ohybové pevnosti byla také vyhodnocena maximální křivost pro oblast vratné deformace a kritická křivost pro deformaci nevratnou. řepková sláma; studený natronový postup; sekundární vlákna; chemicko-mechanická vláknina; pevnost v ohybu
eng Bending stiffness for handsheets made of a blend of secondary fibres and chemi-mechanical pulp from rapeseed straw 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, in mass ratio of 3 : 1, and 1 : 1, with a basis weight of around 520 g/m2. 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 to 43 – 46 °SR (Schopper-Riegler degree). The chemi-mechanical pulp was characterized by its 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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