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Strength characteristics of chemi-mechanical pulp from rapeseed straw
Authors: Potůček František | Gurung Bijay
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Acta Facultatis Xylologiae Zvolen
Publisher name: Technická univerzita vo Zvolene
Place: Zvolen
Page from-to: 51-57
Titles:
Language Name Abstract Keywords
cze Pevnostní charakteristiky chemicko-mechanické buničiny z řepkového slámy Cílem práce bylo ověřit využití řepkové slámy k výrobě chemicko-mechanické buničiny. Stonky řepkové slámy byly nejprve nastříhány, mlety v suchém stavu, následně vyluhovány do vodného roztoku hydroxidu sodného a nakonec mlety ve vodné suspenzi. Sledován byl dávky hydroxidu sodného v operaci vyluhování na pevnostní vlastnosti chemicko-mechanické buničiny. Předběžné výsledky ukázaly, že s rostoucí dávkou hydroxidu sodného rostla pevnost v ohybu testovaných vzorků o plošné hmotnosti až do 590 g m-2. Výsledky byly porovnány s daty naměřenými pro nebělenou dřevovinu a vlákninou používanou k výrobě nasávaných produktů. Rovněž byl proměřen stupeň polymerace připravených vzorků chemicko-mechanické buničiny, který se v závislosti na dávce hydroxidu sodného měnil v mezích 96 do 224. chemicko-mechanická buničina; řepková sláma; pevnost v ohybu; stupeň polymerace
eng Strength characteristics of chemi-mechanical pulp from rapeseed straw The objective of this work was to determine the potential application of rapeseed straw in the chemi-mechanical pulping process. Stalks of rapeseed straw (species Brassica napus L. convar. napus) were used for the pulping process. The chemi-mechanical pulping comprises four main operations, viz. chipping, grinding, leaching, and beating. For chemi-mechanical pulps, the influence of caustic soda charge applied in the leaching process upon the bending stiffness and bending modulus of elasticity in the region of reversible deformation was investigated by using a three-point loading method. The preliminary results revealed that the bending modulus of elasticity increases with increasing caustic soda charge from 0.22 to 1.11 kN mm-2 for both basis weights of the handsheets (approx. 260 g m-2 and 520 g m-2). Similarly, the bending stiffness of handsheets having lower basis weight slightly increases with increasing alkaline charge, whereas, for higher basis weight, the effect of alkaline charge on the bending stiffness is ambiguous. Of course, the tensile strength of chemi-mechanical pulps was much lower than that published for kraft pulp or waste paper. The results obtained for rapeseed straw were compared with those measured for unbleached spruce groundwood and for moulded fibre products, which were published earlier. The bending stiffness and bending modulus of elasticity were much greater than those for moulded fibre products made from waste paper. Besides the strength characteristics, the degree of polymerization and bonding properties of rapeseed straw pulp were investigated. Owing to the presence of low molecular substances, the degree of polymerization of chemi-mechanical pulp was found to be within the limits of 96 to 224, depending on caustic soda charge applied in the leaching process. chemi-mechanical pulping; rapeseed straw; bending stiffness; degree of polymerization

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