JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Studies on the Cooking of Rape-seed. [Brassica Rapa var. nippo-oleifera Makino]
[II]The Cooking of the Stalk of Rape-seed by Sulphite Method
Saburo Isa
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JOURNAL FREE ACCESS

1958 Volume 12 Issue 10 Pages 670-674

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Abstract

I reported the cooking of the stalk of Rape-seed by sulphate method and concluded that the pulp was easy to wet beating and as strong as hard wood pulps.
So in this paper, I try pulping of it by sulphite method. The concentration of cooking liquor is 0.03 mol sulphite and 0.4 mol. bisulphite and base is Na or Mg. Optimum digestion time is 180 minutes at 165°C for both bases. Steeping time is enough 60 minutes at 110°C for Na base but is neccessary at least 90 minutes at the same temperature for Mg base. Pulp yield is about 46% for easy bleach and 5359% for strong pulp. And these results are better than rice and barley straw.

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© Japan Technical Association of the Pulp and Paper lndustry
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