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Volume 31, Issue 10
Displaying 1-8 of 8 articles from this issue
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1977 Volume 31 Issue 10 Pages 48-51
Published: 1977
Released on J-STAGE: November 11, 2009
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1977 Volume 31 Issue 10 Pages 76
Published: 1977
Released on J-STAGE: November 11, 2009
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Itsuki Nishi1977 Volume 31 Issue 10 Pages 673-684
Published: 1977
Released on J-STAGE: November 11, 2009
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Akira Miyoshi1977 Volume 31 Issue 10 Pages 685-690
Published: 1977
Released on J-STAGE: November 11, 2009
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Noboru Yamada, Moriyuki Hirota, Masaaki Fuwa, Akio Hashimoto, Hideo Ha ...1977 Volume 31 Issue 10 Pages 691-697
Published: 1977
Released on J-STAGE: November 11, 2009
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1977 Volume 31 Issue 10 Pages 698
Published: 1977
Released on J-STAGE: November 11, 2009
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Hiroshi Kamishima, Toshiro Fujii, Isao Akamatsu1977 Volume 31 Issue 10 Pages 699-706
Published: 1977
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSThe present paper deals with the optimum bleaching conditions and properties of ozone bleached douglas fir kraft pulp which were carried out with the addition of methanol as cellulose protector.
The optimum amount of methanol as the additive was 80100% on pulp. The addition of methanol containing H2SO4 did not have the combined effects of acidic medium and methanol addition from the point of inhibiting cellulose degradation.
By methanol addition in ozone bleaching, copper number of bleached pulp decreased, α-cellulose content increased, pentosan content slightly increased compared to control bleached pulps. Residual lignin of bleached pulp was lower than that of control bleached pulps.
The yield of bleached pulp increased a little and consumed ozone came to increase a little degree. Strength properties, such as breaking length and tear factor, improved compared to control bleached pulps.View full abstractDownload PDF (961K) -
Huyuh Van Ba, Toshio Tajima1977 Volume 31 Issue 10 Pages 707-715
Published: 1977
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSReed had been known as a potential material for pulp manufacture in Vietnam by a large storage at Mekong Delta.
Chips obtained from reed stalk were digested in nitric acid and extracted with ammonium hydroxide (detailed in Table 2). As a reference, the conventional kraf t and mono-sulfite pulpings were carried out.
The results can be summarized as follows :
(1) The nitric acid pulps have lower pulp yield, dark color and lower drainage than mono-sulfite pulp, but can remove all of white membranuous material in the inner wall of reed stalk cave. Result of nitric acid pulp at the same permanganate number with kraft pulp indicated higher pulp yield but lower DP and brightness value.
(2) As for nitric acid pulps, the lower yield pulp had a higher sheet density, but lower strength properties.
(3) Comparing at the same sheet density, the nitric acid pulp showed the similar strength properties as the kraft pulp ; but at the higher sheet density, the strengths of the nitric acid pulp were lower than those of kraf t pulp. Mono-sulfite pulp was relatively weeker than the other two pulps.
(4) The amounts of cyanic acid evolved in process, suspended solid, chemical oxygen demand, reducing sugars, organic acids and nitrohumic acids of spent liquors were determined also.View full abstractDownload PDF (950K)
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