巻号一覧
前身誌
15 巻, 1 号
選択された号の論文の11件中1～11を表示しています
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太田 武雄1961 年 15 巻 1 号 p. 2
発行日: 1961/01/10
公開日: 2009/11/17
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木下 又三郎1961 年 15 巻 1 号 p. 3-5
発行日: 1961/01/10
公開日: 2009/11/17
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加藤 太朗1961 年 15 巻 1 号 p. 6-12
発行日: 1961/01/10
公開日: 2009/11/17
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福田 祐作, 高橋 昭之介1961 年 15 巻 1 号 p. 13-20
発行日: 1961/01/10
公開日: 2009/11/17
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谷口 稔1961 年 15 巻 1 号 p. 21-25
発行日: 1961/01/10
公開日: 2009/11/17
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西本 正三1961 年 15 巻 1 号 p. 26-32
発行日: 1961/01/10
公開日: 2009/11/17
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水溶液の電導度ならびに拡散係数について小島 義一, 中井 章能, 舘 勇1961 年 15 巻 1 号 p. 33-39
発行日: 1961/01/10
公開日: 2009/11/17
ジャーナル フリー(Department of Agricultural Chemistry, Faculty of Agrieulture, Kyoto University, Kyoto)
Conductivity curves, the equivalent conductance√c or the specific conductivity c plots, show apparent breaks at a certain critical concentration (cM), analogous to a sharp discontinuity around CMG in the curve of colloidal electrolyte solution. This break is more sharp especially in the lower molecular weight fractions of ligninsulphonates. The cm is about 0.20-0.25g/100cc for all fractions, independent of their molecular weights.
Dependence of diffusion coefficient on concentration was measured by use of a solution-to-gel (0.595% agar) system. The degree of dependence of diffusion coefficient on concentration changes discontinuously also at cM. In the highest molecular weight (55800) fraction this change is neglisible small, and the diffusion coefficient decreases suddenly with increasing concentration in the region below and also above cM. In the lowest fraction (MW 550), on the other hand, this change is considerably large, and the diffusion coefficient decreases suddenly with increasing concentration in the region below cM but very slowly in the region above cM.
These observations indicate that the structure of ligninsulphonate molecules in aqueous solution varies in some unexplained mechanism at cM and that this structural variation occurs remarkably in the low molecular weight fractions than in the high. However, whether this structural variation is due to an association of ligninsulphonate molecules in solution with a manner analogous to micelle formation in colloidal electrolyte, as Gardon pointed out, remains an open question.抄録全体を表示PDF形式でダウンロード (1426K) -
戸田 久昭, 木島 常明1961 年 15 巻 1 号 p. 40-49,57a
発行日: 1961/01/10
公開日: 2009/11/17
ジャーナル フリーSeveral softwoods and hardwoods sulphite-type pulps ranging in yield from GO to 46% were bleached with three-stages bleaching process (chlorination, causLie extraction, hypochlorite bleaching, and the comparisons were made on the physical and chemical properties of resulting bleached pulps.
Bursting strength of bleached pulps cooked by the same process increases with unbleached pulp yield (Fig. 1 and 2), but such a clear difference is not found generally in beating rate (Fig. 3 and 4.) Water retention values of bleached pulps at the equal healing time or the equal freeness increase, however, with unbleached pulp yield (Fig. 5, 6 and. 7) Conventional acid sulphite pulps are superior than hisulphite pulps in easiness of beating, and their water retention values increase more rapidly than those of bisulphite pulps.
The fact, that the alkali soluble hemicelluloses, especially uronic acid contents of bleached pulps increase with unbleached pulp yield, and bisulphite pulps are remarkaidy poor in uronic acid (Fig. 8 and 9), shows the presence of some relations between these hen- icellulcos and water retention (swelling) property of pulp.
Water retention value of bleached pulp is closely related with specific scattering coefficient or opacity of the sheet, irrespective of cooking process and unbleached pulp yield (Fig. 11 and. 12). Both water retention value and specific scattering coefficient are related with tensile and bursting strengths of the sheet of bleached pulps (Fig. 10, 13 and 14).
It is apparent that the hemicelluloses, especially uronic acids, manifest their effects upon the pulp properties, due to rapid swelling and making of the much bonded area to be developed during beating without much decrease in fiber strength. Tensile and bursting strengths of bisulphite pulps are, however, slightly higher than those of conventional acid sulphite pulps at the equal water retention value or the equal specific scattering coefficient. Sheet density at the equal specific scattering coefficient decrease with unbleached pulp yield (Fig. 15).抄録全体を表示PDF形式でダウンロード (1931K) -
高伸度紙の諸特性について (第3報)藤波 宣陽, 岡村 武文, 平野 睦夫1961 年 15 巻 1 号 p. 50-57
発行日: 1961/01/10
公開日: 2009/11/17
ジャーナル フリー1) As the toughness of machine direction of high stretchable paper is larger than that of cross direction of the paper, in the case of face and back drop test, the drop numbers to destruction of high stretchable paper are more than normal kraft paper. In the case of butt drop test, reversely high stretchable paper is apt to destruct than kraft paper.
2) It is well known that the toughness of cross direction of normal kraft paper is larger than that of machine direction of the paper.
It is hypothesized from the fact mentioned above that a bag taking the cross direction of the paper for the lengthwise direction of the bag would be more difficult to rupture than a bag taking the machine direction of the paper for the lengthwise direction of the bag.
Whereas we made experiment according to the hypothesis, the drop numbers to destruction of both types of bags were nearly equal.
For one of the reasons, it is indicated that the results of drop test of bags are not always related to those of toughness of the paper.
Because, it will be suspected that the test of toughness of the paper is static and while the drop test is dynamic.
3) From the results of testing the pulp obtained by disintegrating high stretchable paper, it is assumed that the toughness of cross direction of the paper might be dropped 20% during passing “ the Extensible Unit.”
Naturally, more investigations should be required for this assumption.抄録全体を表示PDF形式でダウンロード (1631K) -
北川 重正1961 年 15 巻 1 号 p. 58-64
発行日: 1961/01/10
公開日: 2009/11/17
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渡 長次郎1961 年 15 巻 1 号 p. 65-73,78
発行日: 1961/01/10
公開日: 2009/11/17
ジャーナル フリーPDF形式でダウンロード (2295K)
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