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Volume 14, Issue 12
Displaying 1-9 of 9 articles from this issue
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1960 Volume 14 Issue 12 Pages 794-801
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
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[in Japanese]1960 Volume 14 Issue 12 Pages 802-811
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (2200K) -
[in Japanese]1960 Volume 14 Issue 12 Pages 812-820
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
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Part 2. The Changes in the Mechanical Properties of Paper during the Repeated-Impulse TestingNobuakira Fujinami, Takefumi Okamura, Mutsuo Hirano1960 Volume 14 Issue 12 Pages 821-825,848
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe repeated-impulse testing like the drop testing was discussed in these studies.
The principle of the repeated-impulse testing was that a weight was dropped from a constant height and the energy of it was given the tested paper repeatedly.
The relation between the repeated-impulse testing and the mechanical properties of paper was also discussed.
The materials tested in these studies were kraft paper and high stretchable paper.
The results were as follows.
(1) The machine direction of kraft paper was brittle, but it was not fatigued soon or immediately.
(2) The toughness of virgin paper was related to the results of the repeated-impulse testing in most cases.
(3) However, for evaluation of the service strength of bag paper, it was not sufficient that only the toughnes was measured.
It should be necessary that the decrease rate of toughness during the repeated-impulse testing must he measured additionally.View full abstractDownload PDF (916K) -
Akira Senoo1960 Volume 14 Issue 12 Pages 826-830,848a
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe effects of hydrogen peroxide bleaching on the brightness of dissolving grade sulfite pulp have been studied.
The most desirable result is obtained in pH 11 with magnesium sulfate and sodium silicate as stabilizer at 40°-50°C, after NaOC1 bleaching.
If only hydrogen peroxide bleaching is carried out either before or after NaOC1 bleaching, the refining degree of pulp has not so remarkable influence on the final brightness.View full abstractDownload PDF (901K) -
Conductometric Titration with Weak BaseYoshikazu Kojima, Akira Hayashi, Isamu Tachi1960 Volume 14 Issue 12 Pages 831-834
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSIt is well known that the conductometric titration of ligninsulphonic acid with strong base shows the existence of weakly acidic group, which has been suggested to be phenolic group, beside sulphonic group.
However, it was found that if ligninsulphonic acid was titrated with weak base, ammonia or dicyclohexylamine, only smaller amount of weakly acidic group was detected than the case with strong base.This weakly acidic group detected with weak base was studied on model substances.
As the results, it was found the pKa value of this group was below eight, and it was suggested this group was carboxylic group.
For that reason, the true value of phenolic group was shown by the difference between the weakly acidic value of strong base titration and that of weak base.View full abstractDownload PDF (708K) -
[in Japanese]1960 Volume 14 Issue 12 Pages 835-837
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
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[in Japanese]1960 Volume 14 Issue 12 Pages 838-840
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (7062K) -
[in Japanese]1960 Volume 14 Issue 12 Pages 841-842
Published: December 10, 1960
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (121K)
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