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Volume 13, Issue 3
Displaying 1-10 of 10 articles from this issue
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[in Japanese]1959 Volume 13 Issue 3 Pages 146-151
Published: March 10, 1959
Released on J-STAGE: November 17, 2009
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[in Japanese]1959 Volume 13 Issue 3 Pages 152-158
Published: March 10, 1959
Released on J-STAGE: November 17, 2009
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[in Japanese]1959 Volume 13 Issue 3 Pages 159-168
Published: March 10, 1959
Released on J-STAGE: November 17, 2009
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[in Japanese]1959 Volume 13 Issue 3 Pages 169-178
Published: March 10, 1959
Released on J-STAGE: November 17, 2009
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1959 Volume 13 Issue 3 Pages 179-182
Published: March 10, 1959
Released on J-STAGE: November 17, 2009
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Junji Nikuni1959 Volume 13 Issue 3 Pages 183-188
Published: March 10, 1959
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSThe factors to be connected with the thermal ageing of insulating paper are affected by temperature and timing as well as the air oxidation.
Strength, aqueous extract conductivity, PH, viscosity of kraft pulps of two kinds and subsequently the kraft paper made from them were measured after having been heated respectively under conditions of the air and vacuum chamber.
Furthermore, the results of electrical properties (tan 8, CR) of drying paper to apply for capacitors were measured with a Schering bridge.View full abstractDownload PDF (958K) -
Yoshihiko Fujii, Masami Kanemoto1959 Volume 13 Issue 3 Pages 189-195
Published: March 10, 1959
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSContact angle was discussed, relation on P versus, √t on three species of the sanAple were plotted for five kind of oil, and the first slope (F. S.) and the second slope (S. S.) were determined.
If ?A=O i. e. cos θ=1, the ratio of F.S. and S.S. between two kinds of oil in the same paper (Y axis), should have a straight line to the ratio √surface tention/viscosity coeffcient of each oil (X axis), and the line should pass the original point, its slope should be 1.
The regression line on 70 point of the experimental value, clossed the Y axis at -0.101 and its slope was 1.106, and we have tested statistically that this line was not different significantly to the theoretical line.
From the fact mentioned above and the fact that in some cases the slope on S.S.is greater than that on F.S., it is likely that the contact angle is a little larger than zero.
Assuming that the mean hydraulic radius which was calculated from the data on the oil penetration method by applying Kozeny-Carman equation is equal to the average paper capillary radius, we can calculate number of capillary per unit area and the product of mean hydraulic radius and number of capillary. Hydraulic radius was measured with the constant pressure air permeability apparatus and number of capillary was calculated from these radii. But the physical meaning of number of capillary are not clearly understood.
On the discussion from the various consideration, it might be concluded that paper should have a different layer on vertical direction. On the paper that the slope of F. S. is greater than that of S.S. penetrating velocity have to be determined on the second layer and so, relation between the number of capillary product with mean hydraulic radius and hydraulic radius by permeability method, should have good correlation value. Actually we have the correlation coefficient almost nearly. The correlation coefficient on the first layer should be lower than that on second layer, and actually it was 0.35.View full abstractDownload PDF (1375K) -
1959 Volume 13 Issue 3 Pages 195
Published: 1959
Released on J-STAGE: February 10, 2010
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II. On the Fines of Litsea lancifolia Viii. (Lauraceae)Yoshikazu Ito, Katsuhiko Okada, Kiyoshi Ohata, Kenji Mori1959 Volume 13 Issue 3 Pages 196-200
Published: March 10, 1959
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSWhen the sulfite pulp of Litsea wood (Kagonoki) were fractionated by Bauer Cleaner, the coarse fiberbundles and parenchymatous cells were inclined to be divided into the acceptance stream, on the other hand the fine hundles into the reject stream. By repeating this fractionation, the unbleached pulp were divided into four fractions. The properties of fines and fiber bundles in these fractions were inve stigated.
The results may be said as follows :
(1) Parenchymatous cells of Litsea wood were remarkably rich in alcohol-benzen extracts chiefly due to oil cells or secretory cells, exerting characteristic of this species. Fines were high in chlorine demand and β-cellulose content, low in α-cellulose content and cuprammonium viscosity. The parenchy matous cells showed very poor ash content.
(2) Fractions containing high amount of fines gave a viscose of high haze value and very poor flit erability responsible to their content. Sulfite pulp of this species had very much fiber bundles cotaining ray cells, so viscose made from this pulp showed a poor filterability even if fines were removed . Among the parenchymatuos cells, oil cells had a very great influence upon the filterability. When the pulp was extracted by aleokol-bezene mixture (1 : 2), filterability and transpaparency wereimporved very much.View full abstractDownload PDF (993K) -
[in Japanese]1959 Volume 13 Issue 3 Pages 201-206
Published: March 10, 1959
Released on J-STAGE: November 17, 2009
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