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Volume 12, Issue 8
Displaying 1-14 of 14 articles from this issue
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[in Japanese]1958 Volume 12 Issue 8 Pages 494-495
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (562K) -
[in Japanese]1958 Volume 12 Issue 8 Pages 496-501
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (1510K) -
[in Japanese]1958 Volume 12 Issue 8 Pages 502-506
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
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Patr. 1 The Changes of Constituents of Wood during Water HydrolysisT. Matsugu, H. Shiraiwa1958 Volume 12 Issue 8 Pages 507-510
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe changes of constituents of Softwood (Red Pine) and hardwood (Pasania) during water hydrolysis were investigated. The results were as follows :
(1) The yield of softwood was higher than that of hardwood.
(2) The majority of soluble lignin was extracted in the initial reaction.
(3) The accessible pentasan that was removed rapidly in the initial reaction was present in softwood.
(4) The dissolving rate of pentosan of hardwood was larger than that of softwood.
(5) The dissolving rate of cellulose of softwood was larger than that of hardwood.
(6) The pentosan and lignin contents were independent on the temperature, and the relationship between the rate of removal and yield appeared to be a straight line. From these results, it could be supposed that lignin and pentosan contents of hydrolyzed wood were determined by yield of wood after hydrolysis.View full abstractDownload PDF (685K) -
Part 2, A Kinetic Study of Reaction of Removed PentosanT. Matsugu, H. Shiraiwa1958 Volume 12 Issue 8 Pages 511-513
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe main reaction of water hydrolysis of wood was the reaction of removed pentosan, as shown in Part 1. In the report presented in this paper, a kinetic study of reaction of removed pentosan was investigated, and the following results were obtained :
(1) The reaction of removed pentosan of red pine appeared to be explained as the sum of two first-order reactions, namely; initial rapid reaction and subsequent slower reaction.
Provided that pasania had inactive pentosan (18% based on pentosan in wood) in this experimental conditions, the reaction of removed pentosan of pasania was made up of one first-order reaction.
(2) The activation energies of each reaction were 18.0 Kcal. for initial rapid reaction and 21.0 Kcal. for subsequent slower reaction of red pine and 33.4 Kcal. for pasania.View full abstractDownload PDF (425K) -
Minoru Okada, Hirotoshi Ida1958 Volume 12 Issue 8 Pages 514-518
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSIn our previous study on the color reversion of pulp (yellowing of pulp), we observed that Cu value of pulp was correlated to the reduce ratio of pulp brightness.
And then when we investigated the UV absorptibity of alkali cellulose fraction dissolved in 8% NaOH solution, we found that remarkable characteristic absorption max, appeared at 267 mμ and increased with ageing process. We suggested that this phenomena was due to oxidized groups in cellulose, especially to CO groups.
This work was carried out in order to investigate the correlation between the color reversion of pulp and characteristic UV absorption of pulp-H3PO4 solution (pulp dissolved in 80% H3PO4).
Materials used were
1. domestic and imported dissolving pulps
2. oxidized (with hypochlorite and periodate) and subsequent reduced (with NaBH4) pulps
The results were as follows :
(1) In general, the pulp-H3PO4 solutions have a characteristic absorption max. at 280-290 mμ and its absorbance is correlated to Cu value (post color value) and brightness of pulp.
(2) In the case of oxidized pulps, the UV characteristic max. increases with degree of oxidation, while in subsequent reduced pulps it significantly decreases or disappears.
(3) The color reversion of pulp has a linear relation to the degree of oxidation of pulp, and also the same relation to UV absorbance at absorption max. In other words, CO groups in cellulose is attributed largely to the color reversion of pulp.View full abstractDownload PDF (895K) -
Saho Itoi, Kunio Higuchi1958 Volume 12 Issue 8 Pages 519-522
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSAs a measure of the reactivity of dissolving pulp the sulphidation resistance (S. W.) of the mercerized cellulose at the same relative viscosity was investigated for the most part from the stand point of the relative viscosity (ηr) of their original pulp.
The results were as follows :
1. The S. W. was mostly affected by the ηr of the original bleached pulp. The lower the ηr, the better the S. W.
2. At the equal level of the vr of pulp, the S. W. was found better, accompanied with high α cellulose content of their original pulp.
However, this effect was smaller than that of ηr.
Yet, when the mercelized cellulose, prepared from the pulp of varied a cellulose content, the ηr remaining constant, was compared in the equal a cellulose content, the difference of the S. W. disappeared.
3. However varied the yr of the unbleached pulp, the bleached pulp which was prepared at the same level of yr and a cellulose content were not different in their S. W. of mercelized cellulose.
4. The over-cooked pulp which has low yr was not necessarily better in this reactivity.View full abstractDownload PDF (646K) -
Yuzo Uyeno, Sadao Kitaura1958 Volume 12 Issue 8 Pages 523-526
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSWhen caustic lime is added in sulfite waste liquor to pH_??_12, lignosulfonic acid (L.S) and the other organic matter (X) are precipitated together.
Conditions of precipitation (amount of CaO, concentration of L.S in S.W.L., temperature etc.) and the composition of precipitate were studied.
Among nonlignin substances, we found five kinds of sugar, mannonic acid, xylonic acid and four acidic substances which are under investigation. The content of X in the product increases with concentration of L.S. in S.W.L.View full abstractDownload PDF (691K) -
A. Kitano, M. Araki, I. Tate1958 Volume 12 Issue 8 Pages 527-531
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe adoption of the suction pick up roll in transferring the wet sheet from the Fourdrinier wire to the press part has resulted in higher speed of paper making and lower frequency of paper breakage than by open system. However, since the suction roll is of complex construction and has to be connected with a vacuum pump, it is very expensive to install and operate .
The postup transfer installation we have developed is free from the above disadvantages, simple in construction capable of efficiency detaching the wet sheet from the wire, and able to transfer to the press part.
The principles and construction of this installation are described, and the plan designed, by Asahi Iron works Co. is illustrated herein.View full abstractDownload PDF (1037K) -
[in Japanese]1958 Volume 12 Issue 8 Pages 532-536
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
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[in Japanese]1958 Volume 12 Issue 8 Pages 537-543
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (7100K) -
1958 Volume 12 Issue 8 Pages 544-547
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (912K) -
[in Japanese]1958 Volume 12 Issue 8 Pages 548-550
Published: August 10, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (507K) -
1958 Volume 12 Issue 8 Pages 557
Published: 1958
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSDownload PDF (222K)
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