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Volume 15, Issue 11
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1961 Volume 15 Issue 11 Pages 708-712,723
Published: November 20, 1961
Released on J-STAGE: November 17, 2009
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Isolation of Ligninsulfonic Acid from Sulfite Spent Liquor (3)Yoshikazu Kojima, Akira Hayashi, Isamu Tachi1961 Volume 15 Issue 11 Pages 713-717
Published: November 20, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSIsolation of ligninsulfonic acid (LSH) with precipitating its dicyclohexylamine (DCHA) salt from sulfite spent liquor (SSL) was studied.
When water solution of mineral acid salt of DCHA was added, SSL was so much diluted that yield of LSH was very low, because solubility of mineral acid salt of DCHA was very poor.
If DCHA was added to SSL directly after removing of calcium sulfate by addition of sulfuric acid, good yield of LSH was obtained. Moreover, concentration of SSL was the higher, yield of LSH was the better.
For example, when 1.5 equivalent DCHA per sulfonic residue of LSH was added to concentrated SSL (LSH content: 31%), yield of LSH was about 80% and fractionation by molecular weight was recognized between precipitated LSH and remaining LSH.
Changing to Na-LS from LSH·DCHA and recovery of DCHA from LSH·DCHA were easily accomplished by steam distilating after addition of equivalent NaOH.View full abstractDownload PDF (1063K) -
Hisaaki Toda, Tsuneaki Kijima1961 Volume 15 Issue 11 Pages 718-723
Published: November 20, 1961
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSBleached sulfite, bisulfite and sulfate paper pulps and linter pulp were beaten by Lampen mill or TAPPI standard test beater, and their brightness drops were compared.
Sulfite pulp decreases generally greater than sulfate pulp in brightness as freeness decreases by beating, and the brightness drop increases also with the hemicellulose content in the same kind of pulp (Table 1 and 2, and Fig. 1, 3 A and 4 A). This reason is due to that the pulp, which is rich in hydrophilic hemicellulose and higher in swellability, increases greater in fiber-to-fiber bonded area, namely decreases in non-bonded area, in the dried pulp sheet beaten at the same freeness, and consequently decreases the proportion of the light reflected out of the sheet.
However, the brightness decreases similarly as the water retention value of the wet pulp increases and the specific scattering coefficient of dried pulp sheet decreases by beating, irrespective of the kind of pulp and the hemicellulose content (Fig. 2, 3 B and 4 B)
Same tendency is observed too, when the pressure to wet pulp sheet is changed (Fig. 5).
That the bleached paper grade pulps, especially high yield pulps, are generally inferior to the dissolving pulps in brightness of unbeaten pulp sheet, is mostly attributed to the richer bonded area (poorer non-bonded area) of dried sheet owing to the higher content of hydrophilic hemicellulose (Table 1, 2 and Fig. 6).
It seems that the brightness is affected also with the difference of morphological fiber structure owing, to the wood species.View full abstractDownload PDF (969K) -
Setsuzo Ohta1961 Volume 15 Issue 11 Pages 724-732
Published: November 20, 1961
Released on J-STAGE: February 10, 2010
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Kazuo Kida, Kaname Kitayama1961 Volume 15 Issue 11 Pages 733-738,754
Published: November 20, 1961
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSIn this paper, a centrifugal pump which is designed especially for high consistency paper stock is studied experimentally. it shows that the paper stock of 9.5 per cent consistency (bone-dry) can be handled by this pump with more excellent results than those ever obtained by other similar pumps. Such excellent results seem to depend upon the wide passage of pump impeller and sufficient suction pressure by the large chest with an agitator. This report describes how the characteristics of the pump are influenced by the consistency of paper stock and suction pressure.
The results obtained are mainly as follows :
(1) The efficiency and bead of centrifugal pump with an open impeller increase with paper stock consistency for a limited extent, because the leakage through the running clearance between impeller blades and casing wall becomes negligible at high consistency.
(2) In order to pump up high consistency paper stock, the suction pressure must be increased linearly ith the consistency ranging from per cent to 9.5 per cent.View full abstractDownload PDF (3413K) -
A Statistical Consideration of Japanese-paper ProductionH. Kato1961 Volume 15 Issue 11 Pages 739-750
Published: November 20, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSBy considering the above-mentioned various statistics, hand-made Japanese-paper brings forth a big problem how to develop itself in future.
Going on with the present condition, there can be nothing for it but to diminish.
Therefore, we should use such valuable fibres as Kozo, Mitsumata, Gampi etc. not for the goods of mass-consumption, but for the valuable goods ; for instance, fine art paper, drawing paper (Gasenshi), hand-writing paper and so on.
Comparing with foreign paper, machine-made Japanese paper etc., hand-made Japanese paper is remarkably longer in its durability. So that, it should he used for the directions in need of eternal. preservation.
Especially, utilizing gampi-paper for eternal keeping printed matters is also reckoned worthy of consideration.View full abstractDownload PDF (1811K) -
1961 Volume 15 Issue 11 Pages 751-752,754a
Published: November 20, 1961
Released on J-STAGE: November 17, 2009
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[in Japanese]1961 Volume 15 Issue 11 Pages 753-754
Published: November 20, 1961
Released on J-STAGE: February 10, 2010
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[in Japanese]1961 Volume 15 Issue 11 Pages 755-758,772
Published: November 20, 1961
Released on J-STAGE: November 17, 2009
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