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Volume 9, Issue 10
Displaying 1-11 of 11 articles from this issue
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[in Japanese]1955 Volume 9 Issue 10 Pages 412
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
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[in Japanese]1955 Volume 9 Issue 10 Pages 413-414
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (354K) -
[in Japanese]1955 Volume 9 Issue 10 Pages 415-417
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
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[in Japanese]1955 Volume 9 Issue 10 Pages 418-424
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
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Isamu Tachi, Akira Hayashi1955 Volume 9 Issue 10 Pages 425-429
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSi) Stems and nodes of wheat straw, without leaves, were cooked by sulphate method for 2 hrs. at 160°C and optimum digestion was accomplished with 1416% total alkali (calc. for NaOH) at 10% sulphidity.Under these conditions, pulp yield, lignin content, and permanganate number were 54%, 3% and 12.
Leaves were cooked under the same conditions, and they gave lower pulp yield and lower permanganate number than those of stems and nodes. However, their lignin content was rather higher than stems and nodes.
ii) A whole wheat straw was cooked under various conditions and bleached with three stage method.Then it was tested on the physical strength properties and analyzed.
A. P. was the best in the physical strength properties, and K. P. was nearly the same at 1416% total alkali and 10% sulphidity to A. P.,
This bleached pulp gave the following values i.e., 40% on yield, 1.2% on lignin content, 80°on brightness (Pulfrich), 8.7 on breaking length, 88 on tear factor, 8.8 on bursting factor and 12001500 on folding endurance.
This physical and chemical properties were superior to those of neutral sulphite straw pulp and not inferior, excepting the tear factor, to those of sulphate hardwood pulp.View full abstractDownload PDF (762K) -
Ryoiti Senzyu1955 Volume 9 Issue 10 Pages 430-434
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSIf acid penetration is incomplete, the lignin in wood dissolves out not perfectly in successive pulping . Hence by determination of the lignin dissolved out in pulping period, the degree of acid penetration can be estimated. Various effects of free sulfur dioxide, temperature and concentration of combined sulfur dioxide on the penetration of combined sulfur dioxide were investigated by determining the dissolved out lignin with colloid-titration. The penetration of combined sulfur dioxide can be acceralated by sulfonation of lignin, so that both factors free sulfur dioxide and temperature are effective on the penetration of combined sulfur dioxideView full abstractDownload PDF (2744K) -
4.Drying of the paper-bags for FertilizerHaruji Kato1955 Volume 9 Issue 10 Pages 435-438
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
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(Report 1) Measurements on the water repellency of papers treated with silicone polymerShigeo Oyama, Yukio Nakaba1955 Volume 9 Issue 10 Pages 439-442
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSQuite a good number of methods for the measurements of water repellency of papers have been known, still there are some margin for the further discussion, however.
The present writer employed the rolling drop method which merely had been applied to textiles by H. A.Schuyten et al., as well as the common spray rating for the reference to the results.
1) The types of silicone polymer used were oily as well as varnish.
2) The oily type were of the benzene solutions containing 0.5%, 1% and 2%respectively.The water repellency were determined as to the temperature and time.
3) As to the varnish type the repellency were measured according to the variations of the conceatration regardless of the heat treating.
4) The test solutions having various surface tensions were prepared using Aerosol MA.The test papers were of special grade Japanese tissue type
5) About 1 dyne/cm of the difference of surface tension of the test solutions were found to be suitable for the measurements.
6) In comparison to the only five points of measurement by the spray rating, we were able to fix any number of desirable points of measurement by the rolling drop method.
7) Heat treatment excessing 5 minutes at 150°C and 20 minutes at 120°C were recognized unnecessary.
8) The limits of water repellency for the respective concentrations of the benzene solutions were 30.2 dyne/cm for 0.5%, 30.2 dyne/cm for 1% and 29.6 dyne/cm for 2%; and for the varnish type 0.5% concentration was found to be enough for the practical purposes.View full abstractDownload PDF (671K) -
[in Japanese]1955 Volume 9 Issue 10 Pages 443-448
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
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1955 Volume 9 Issue 10 Pages 449-450
Published: October 15, 1955
Released on J-STAGE: November 17, 2009
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1955 Volume 9 Issue 10 Pages 450-451
Published: October 15, 1955
Released on J-STAGE: February 10, 2010
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