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Roztwarzanie i bielenie mieszanek drewna i konopi. Część I. Zapotrzebowanie alkaliów, wydajność mas celulozowych, ich skład frakcyjny i właściwości włókien
Języki publikacji
Abstrakty
In the paper, results of the kraft pulping of blends of birch or pine with hemp stalks or a hemp-woody core composed of 80% wood and 20% hemp fibrous raw materials are presented. The unbleached kraft pulps produced were then subjected to oxygen delignification and bleaching in order to obtain bleached kraft pulps. The research performed made it possible to compare the final yield and viscosity of the bleached kraft pulps from raw material blends with those of kraft pulps from birch and pine. The effect of replacing 1/5 of birch or pine with hemp fibrous raw materials on the content of individual fractions of fibres in the bleached pulps, the relative content of fines in them, the average length and width of fibres, its coarseness and the fibres’ deformation indices was also determined. From the study it follows that better effects of replacing a part of wood in the process of production of bleached kraft pulps are achieved with hemp stalks. Blends of wood with this fibrous raw material give a higher final yield of pulps, lower content of fines and higher average fibre length than using blends of wood and a hemp woody-core.
W pracy określono wydajność mas celulozowych w procesie roztwarzania metodą siarczanową mieszanek drewna brzozowego i sosnowego z łodygami konopnymi i drewnikiem konopnym. Uzyskane masy celulozowe niebielone poddano następnie procesom delignifikacji tlenowej i bielenia w celu uzyskania mas w pełni wybielonych. Badania umożliwiły porównanie wydajności końcowej, a także lepkości uzyskanych bielonych mas celulozowych z tymi wskaźnikami bielonych mas brzozowej i sosnowej. Określono również wpływ zastąpienia 1/5 drewna surowcami konopnymi na skład frakcyjny bielonych mas celulozowych, względną zawartość w nich frakcji drobnej, a także długość i szerokość włókien oraz wskaźnik ciężaru jednostki długości włókna. Badania wykazały lepsze efekty zastąpienia drewna łodygami konopnymi. Przerób mieszanek drewna z tym surowcem konopnym umożliwił bowiem uzyskanie wyższej wydajności bielonych mas celulozowych, niższej zawartości w nich frakcji drobnej i wyższej średniej długości włókien w porównaniu z tymi wskaźnikami bielonych mas celulozowych z mieszanek drewna brzozy i sosny z drewnikiem konopnym.
Czasopismo
Rocznik
Strony
112--117
Opis fizyczny
Bibliogr. 56 poz., rys., tab.
Twórcy
autor
- Lodz University of Technology, Institute of Papermaking and Printing, Fibrous Papermaking Pulps Technology Division, ul. Wolczanska 223, 90-924 Łódź, Poland
autor
- Lodz University of Technology, Institute of Papermaking and Printing, Fibrous Papermaking Pulps Technology Division, ul. Wolczanska 223, 90-924 Łódź, Poland
Bibliografia
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Uwagi
PL
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-f1229452-f75b-4c0e-bceb-a22fc35a8a7f