JAPAN TAPPI JOURNAL

[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 9 Pages 574-575
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.574

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[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 9 Pages 576-582
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.576

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[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 9 Pages 583-588
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.583

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[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 9 Pages 589-592,606a
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.589

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Effect of Hemicelluloses on the Difference of Papermaking Properties between Various Semichemical Pulps

Hisaaki Toda, Tsuneaki Kijima

1961 Volume 15 Issue 9 Pages 593-599
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.593

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Several semichemical pulps were obtained in yield of about 75 % from birch wood by means of acid sulfite (initial pH 1.5 of cooking liquor), bisulfite (pH 4.5), mildly acid sulfite (pH 6.0), neutral sulfite (pH 8.4) and sulfate cookings, and the comparisons were made on their compositions and the papermaking properties of resulting bleached pulps.
If compared at the same level of yield, the various sulfite type unbleached semichemical pulps are nearly equal in lignin content and carbohydrate composition. On the other hand, unbleached sulfate semichemical pulp is higher in lignin content and somewhat lower in mannan and cellulose content, but nearly equal in xylan and uronic acid contents compared with the sulfite type pulps at the equal yield (Table 1 and 2).
The hemicelluloses extracted from these pulps are nearly equal in composition, but are greatly varied in the other properties relating closely to strength of a fiber-to-fiber bond of each pulp sheet, such as degree of polymerization (Fig.1), viscosity (Fig. 4) and adhesive property (Fig. 5) according to the cooking process. That is, in the case of sulfite type cookings, these properties of hemicellulose lowering with decreasing of pH value of cooking liquor, and consequently bleached semichemical pulps obtained by bisulfite cooking and acid sulfite cooking are inferior to mildly acid sulfite and neutral sulfite semichemical pulps in sheet strength, especially tearing strength (Fig. 3).
Bleached neutral sulfite semichemical pulp is generally equal or slightly higher in paper strength than bleached sulfate chemical (Fig. 6) or semichemical pulps. This fact is also probably due to that the hemicelluloses in these pulps are nearly comparable in the above properties.

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Physical Point of View on Printability of Paper (Part 4)

Setsuzo Ohta

1961 Volume 15 Issue 9 Pages 600-606
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.600

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Studies on Ligninsulfonie Acid (VIII)

Fractionation with Organic Solvent System

Yoshikazu Kojima, Akira Hayashi, Ken Higashitsuji, Isamu Tachi

1961 Volume 15 Issue 9 Pages 607-611
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.607

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Fractionation of dicyclohexylamineligninsulfonate in organic solvent system was studied. Among various solvent-precipitant systems, methanol-ethylacetate system was most suitable, and the fractionation process with this system was very easy. 12 fractions were separated with successive fractional precipitation of this system and several properties, of these fractions were researched. Consequently, it was found that fractionation was influenced by both molecular weight and density of sulphonic residue. The influence of sulfonic residue of this method was greater than that of water-ethanol system.

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Studies on Cyclic Treatment of Alkali Pulp Waste Liquor and Semichemical Pulp Waste Liquor

(Part 2) Manufacture of Semichemical Pulp by Reproduced Cooking Liquor from Kraft Pulp Waste Liquor

Yutaka Kimura, Toshiro Fujii, Isao Akamatsu, Yasuichi Murao

1961 Volume 15 Issue 9 Pages 612-616
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.612

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The manufacture of semichemical pulp by reproduced cooking liquor from kraft pulp black Iiquor was studied. The results are summarized as follows :
1. Carbonation-sulphitation method to manufacture cooking liquor from kraft pulp black liquor was employed in attempt to avoid the formation of Na₂S₂0₃ which is formed by direct sulphitation of Na₂S in black liquor. Reproduced cooking liquor by carbonation-sulphitation method containd 23g/lof Na₂S₂0₃ and by direct sulphitation contatined 50 g/lof Na₂S₂0₃.
2. Red pine could be pulped to give 5565 % yield of semichemical pulp with Roe number of 1520 by reproduced cooking liquor using carbonation-sulphitation method.

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[title in Japanese]

[in Japanese]

1961 Volume 15 Issue 9 Pages 617-621
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.617

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[title in Japanese]

[in Japanese], [in Japanese]

1961 Volume 15 Issue 9 Pages 622-623,637
Published: September 10, 1961
Released on J-STAGE: November 18, 2009

DOIhttps://doi.org/10.2524/jtappij.15.622

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