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Volume 13, Issue 10
Displaying 1-8 of 8 articles from this issue
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F.E. Brauns1959 Volume 13 Issue 10 Pages 696-703
Published: October 10, 1959
Released on J-STAGE: November 17, 2009
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[in Japanese]1959 Volume 13 Issue 10 Pages 704-708
Published: October 10, 1959
Released on J-STAGE: November 17, 2009
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Mamoru Kusumoto1959 Volume 13 Issue 10 Pages 709-715
Published: October 10, 1959
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe tanning properties of SWL (sulfite waste liquor) obtained on preparing dissolving pulps from Japanese red pine (Pinus densiflora) were investigated.
The methoxy contents (M) of SWL and vegetable tannins were determined. M of the tannin (by the hide powder method) of chestnut, wattlebark and SWL were 0.8, 0.4 and 11.4%, and M of the nontannin of these were 1.4, 3.1 and 3.0 %.
M g/cc vegetable tannin liquor when tannning hides decreased gradually, but M % of solids of this liquor increased clearly. M of adsorbed materials in the leather tanned by the fresh wattlebark and chestnut were 0.4 and 0.8 respectively. Therefore, in this case, it means that thetannin was only adsorbed and the nontannin was not scarcely adsorbed by the hides.
However, M of the adsorbed materials in the leather tanned by the fresh SWL were 6.4-9.0 %. Therefore, in this case, it means that the nontannin of SWL was fairly adsorbed by the hides. M of the adsorbed materials in the leather tanned by the mixture of SWL and the vegetable tannin were determined. The vegetable tannin was not adsorbed by the hides prior than SWL in themixture, as the tannin content of SWL to the vegetable tannin was lower than 1/2.View full abstractDownload PDF (947K) -
(Part 1) On the Preparation of the Dispersing Agent for CementIsamu Suzuki, Shigemasa Nagano1959 Volume 13 Issue 10 Pages 716-721
Published: October 10, 1959
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe Research Laboratoy of the Kokusaku Pulp Industry Co. Ltd. 1-184, Kamiochiai, Shinjuku-ku, Tokyo
Precipitation of sulfite waste liquor with coustic lime has been investigated.
Caustic lime was added stepwise and the course of the precipitation was followed by measuring PH, content of methoxzyl group, amount of the precipitate. ash and sugar contents of the supernatant liquor as well as of the prectipitate, sugar content was measured by paper chromatography.
It was found that nearly 80% of the sugars existed in sulfite waste liquor remained unprecipitated in solution.
Decomposition of the precipitate with the required amount of hydrochloric acid chiefly gave an aqueous solution of the soluble ligninsulfonate and calcium chloride, 30% of the solid of the solution being calcium chloride.
When this solution was spray dried, calcium chloride in the dry matter dissolved little in alcohol of above 97.5%, probably because calcium chloride was covered with the lignosulfonate, which was insoluble in alcohol.
As the result of the concrete test, it was shown that the spray dried matter thus obtained has good properties as dispersing agent for cement.View full abstractDownload PDF (996K) -
(Part 1) Effects of Heating in the Air upon Dielectric Property of Dry PaperYuichiro Take, Yutaka Suzuki, Ryosuke Matsunaga1959 Volume 13 Issue 10 Pages 722-728
Published: October 10, 1959
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSElectrical insulating paper for high voltage cable was heated in the air of the temperatures of 110°C to 210°C, and its dielectric and chemical properties were measured.
(1) The dielectric property of dry paper at the high temperatures is remarkably affected by heating in the air.
When it is heated in the air of the temperatures of 110°C and 130°C, the dielectric loss decreases up to 120 hours with heating time.
(2) Although there is certain degradation of fibers composing paper, dielectric property has come to be better and up to D. P. of about 800 it becomes to be better with the decrease of D. P..
(3) Under the same condition of degradation of fibers, when it is heated in the temperatures of 110°C to 130°C, the dielectric loss is the best.
(4) Carboxyl groups decrease continuously with heating time, but start to increase after it is severely heated.
(5) Velocity constants of decomposition of fibers composing paper were obtained from the changes in D. P., and activation energy calculated by them is 29.6kcal/mol.View full abstractDownload PDF (417K) -
1959 Volume 13 Issue 10 Pages 728
Published: 1959
Released on J-STAGE: February 10, 2010
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[in Japanese]1959 Volume 13 Issue 10 Pages 729-744
Published: October 10, 1959
Released on J-STAGE: November 17, 2009
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1959 Volume 13 Issue 10 Pages 762
Published: 1959
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSDownload PDF (122K)
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