巻号一覧
前身誌
32 巻, 6 号
選択された号の論文の10件中1～10を表示しています
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パルプ機械(追補)蒸解薬品の回収西 済1978 年 32 巻 6 号 p. 337-338
発行日: 1978/06/01
公開日: 2009/11/10
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1978 年 32 巻 6 号 p. 339
発行日: 1978年
公開日: 2010/01/22
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GP 品質と抄造上の諸問題上田 末喜1978 年 32 巻 6 号 p. 340-345
発行日: 1978/06/01
公開日: 2009/11/10
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1978 年 32 巻 6 号 p. 346
発行日: 1978年
公開日: 2010/01/22
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門屋 卓, 大江 礼三郎1978 年 32 巻 6 号 p. 347-358
発行日: 1978/06/01
公開日: 2009/11/10
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海水から分離した細菌によるクラフトリグニンの分解川上 日出国, 大山 哲夫1978 年 32 巻 6 号 p. 359-367
発行日: 1978/06/01
公開日: 2009/11/10
ジャーナル フリーKraft lignin has been considerably degraded by bacteria, which have the ability to utilize biphenyl type compounds such as dehydrodivanillin (DDV) and dehydrodivanillic aced.
In the present investigation, three DDV utilizing strains were isolated from about 150 sea water samples. These strains were identified as Pseudomonas species. Two strains (MN-3·1 and MN-3.2) are most likely fresh water bacteria, and degraded kraft lignin to some extent. But the ability of these strains to degraded lignin was lower than that of strain isolated from fresh water samples.
One strain (MT-9·10) is perhaps a marine bacterium. The lignin was degraded to a much smaller extent by this strain than the other two strains.
Demethylation of guaiacyl lignin models was coused by these strains, but demethoxylation was not.
The lignin was decomposed by these strains quite uniformly, and few differences of the functional groups between the biodegraded and original lignins were observed.抄録全体を表示PDF形式でダウンロード (3263K) -
パルプ漂白に関する研究第8報沖 妙, 石川 久雄, 大久保 克美1978 年 32 巻 6 号 p. 368-376
発行日: 1978/06/01
公開日: 2009/11/10
ジャーナル フリーNeutral H2O2 bleaching of various unbleached pulps under the mild conditions was carried out.
A portion of lignin in the pulps was oxidatively degraded to the water-soluble products. The increased color removal observed when high-yield pulps were bleached, demonstrates the lebelling-off effect encountered in H2O2 bleaching. But, the brightness of chemical pulps increased up to about 70% during the bleaching.
Milled wood lignin and dioxane lignin, isolated from ground pulp or chemical ground pulp, were degraded with H2O2 in a neutral homogeneous system at 20°C. The change of absorbance at 350 nm or 457 nm of the lignins shaves the levelling-off in brightness gain, being the same as the bleaching of high-yield pulps. But, the absorbance of thiolignin and lignosulfonate at the same wave length decreased during H2O2 treatment. The chromophores in all lignin preparations employed were more rapidly degraded than the aromatic nuclei.
Attempts are reported in this report to characterize the reaction of model compounds with H2O2 at pH 7.0. The formation of colored products from β-aryl ketones in model compounds employed was identified. 2-Methoxy-p-quinone and 2-methoxy-p-hydroquinone were important intermediates in the formation of colored materials from vanillin or acetovanillone.
Based on the above-mentioned results, it can be concluded that the levelling-off in the brightness gain of high-yield pulps by neutral H2O2 bleaching is at least due to the formation and/or the stabilization of new H2O2-resistant chromophores via p-quinone or p-quinoid structures. It is also suggested that the quinoid structures are formed from color-contributing carbonyl groups in the reaction of lignin with H2O2.抄録全体を表示PDF形式でダウンロード (1398K) -
第2報 ユーカリ道管要素の抄紙特性及び化学分析値について緒方 康利1978 年 32 巻 6 号 p. 377-386
発行日: 1978/06/01
公開日: 2009/11/10
ジャーナル フリーMechanical and chemical characteristics of eucalyptus vessel elements have beee studied with special reference to their effects on paper qualities.
Any significant morphological changes of eucalyptus vessels during beating were not observed down to 440 ml freeness level, indicating that a more intense beating action should be applied to effect vessel breaking.
From the paper-sheet forming study in which the separated vessel elements were blended with wood fibers at various vessel ratio ranging from 0 to 100%, it was found that the vessel elements tended to result in higher sheet density, reduced air permeability, lower stiffness, and deteriorated tensile, tear, plybond, and surface strengths. Intrinsic strength of vessel elements, and their inter-element adhesion were found to be considerably lower than those of wood fibers, which seems to be accounted for the greater part of the abovementioned effects.
The separated eucalyptus vessel elements were dyed, mixed in paper stock furnish, and formed into paper sheets using a pilot paper machine. The results of this experiment indicated that the transverse distribution of vessel elements in the sheets were rather uniform, and that the vessels which were picked out in a high-tack offset printing corresponded to only a slight portion of total number of surface exposed vessel elements. The apparent density of eucalyptus vessels was calculated as 1.66 by author, which is considered to be considerably higher than that of wood fibers.
A chemical analysis of seperated eucalyptus pulp components (wood fibers, parenchyma cells, and vessel elements) revealed that the pentosan content was highest in the vessel elements, whereas the pitch was localized mostly in the parenchyma cells and to a lesser extent in the vessel elements.抄録全体を表示PDF形式でダウンロード (3659K) -
1978 年 32 巻 6 号 p. Preface8
発行日: 1978/06/01
公開日: 2009/11/10
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1978 年 32 巻 6 号 p. Preface9-Preface15
発行日: 1978/06/01
公開日: 2009/11/10
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