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Volume 10, Issue 4
Displaying 1-12 of 12 articles from this issue
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[in Japanese]1956 Volume 10 Issue 4 Pages 154-155
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
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[in Japanese]1956 Volume 10 Issue 4 Pages 156-158
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
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1956 Volume 10 Issue 4 Pages 158-158,165
Published: April 10, 1956
Released on J-STAGE: February 10, 2010
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[in Japanese]1956 Volume 10 Issue 4 Pages 159-162
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
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[in Japanese]1956 Volume 10 Issue 4 Pages 163-165
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
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[in Japanese]1956 Volume 10 Issue 4 Pages 166-168
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
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[in Japanese]1956 Volume 10 Issue 4 Pages 169
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
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Report V. The Effect of Synthetic Resin Coating on the Bursting Strength of PapersMitsuo Fujii, Yasuji Otsuka1956 Volume 10 Issue 4 Pages 170-175
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe effects of unplasticized and plasticized synthetic resin coating on the bursting strength (BS) of papers were studied.
The commercial kraft papers were coated with two kinds of commercial vinyl latices (PVC latex and PVC-polyvinyldene chloride latex) of various cone. under various drying conditions.
When the coated papers are dried below the film-forming temp. Tf of latices (M. Fujii and Y. Otsuka ; Chem. of High Polym., Japan, 12, 93 (1955) and see Report I), the BS of the papers are smaller than the BS of untreated paper, but the curing effect is great. Too much plasticizer content decreases the BS, in spite of good film are formed.
The authors have discussed the experimental results from the Tf of the latices and the strength of resin mass, and have succeeded to show the important nature of Tf of latices for the paper coating (see Report I, II, III and IV).View full abstractDownload PDF (892K) -
Prehydrolysis Sulphate CookingYusaku Fukuda, Sueo Yamashita1956 Volume 10 Issue 4 Pages 176-180
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThis time we took shavings as thin as 200 micron from Ezomatsu (a kind of spruce in Hokkaido, Japan) and cooked them through prehydrolysis sulphate process. We measured the amount of removed lignin, pentosan and cellulose. Each amount was contrasted with the result of sulphate or sulphite. cooking.
Through water-prehydrolysis (2 hrs. at 160°C), the wood-hcmieellulose like pentosan was selectively hydrolysed and extracted partly, while cellulose and lignin remained unchanged. The dissolving rate of pentosan through prehydrolysis sulphate cooking is similar to the rate in case of sulphite process.
The content of alpha-cellulose in pulp reaches the highest (96.74 %) at a certain period of alkaline digestion when the lignin in the wood has not yet been removed enough for the wood-fibres to be easily separated each other. If we are to avoid over-cooking and excessive degradation of cellulose, it is required to adjust the rate of removal of lignin with that of hemicellulose.
The above fact leads us to the conclusion that higher yield or better quality of prehydrolscd sulphate pulp will be obtained by finding the way to remove the part of lignin in the wood chips during prehydrolysis or to accelerate further the removal of lignin during sulphate cooking.View full abstractDownload PDF (910K) -
Syozo Nishimoto1956 Volume 10 Issue 4 Pages 181-186
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe mechanism of water removal from pulp suspensions was studied by laboratorial filtration and the compression-permeability tests. The mechanism can be explained by the Kozeny-Carrnan relationship, on the narrow range of frictional pressure drop across the pulp bed (10-100cm W.C.). However, at the relatively high pressure stress existing under filtration conditions, the Kozeny-Carman relationship could not be employed in the usual manner, as the Kozeny constant and the specific surface increased with the increase of the pressure stress. Morecover, it was difficult to relate the physical properties of the pulp fibers to the average specific resistance, because of the considerable decrease of the effective specific volume of fibers. For estimating the approximae value of the average specific resistance under the high press, the graphical integration of equation (8) with the compression-permeability data may be used.View full abstractDownload PDF (929K) -
Toshiro Haga1956 Volume 10 Issue 4 Pages 187-188
Published: April 10, 1956
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSRecently F. Bridge, et al reported K.B.B. size tester, in which sintered bronze electrode was employed. In the modified type, copper and sponge rubber are used instead of sintered bronze to make close contanct between electrode and paper.View full abstractDownload PDF (1930K) -
[in Japanese]1956 Volume 10 Issue 4 Pages 189-196
Published: April 10, 1956
Released on J-STAGE: November 17, 2009
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