紙パ技協誌

海外技術ニュース

1977 年 31 巻 10 号 p. 48-51
発行日: 1977年
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.31.10_48

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訂正

1977 年 31 巻 10 号 p. 76
発行日: 1977年
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.31.10_76

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製紙技術改善の歩み (29)

本邦洋紙成長期に活躍した学校出の技術者達 (X)

西済

1977 年 31 巻 10 号 p. 673-684
発行日: 1977年
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.31.10_673

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油浸紙の熱劣化防止技術について

三好昭

1977 年 31 巻 10 号 p. 685-690
発行日: 1977年
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.31.10_685

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抄紙排水処理と再利用

山田登, 広田守之, 府玻昌明, 橋本昭雄, 浜端英男

1977 年 31 巻 10 号 p. 691-697
発行日: 1977年
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.31.10_691

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パピルス

1977 年 31 巻 10 号 p. 698
発行日: 1977年
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.31.10_698

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クラフトパルプのオゾン漂白におけるメタノール添加の影響

上嶋洋, 藤井利郎, 赤松勲

1977 年 31 巻 10 号 p. 699-706
発行日: 1977年
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.31.10_699

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The 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.

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アシの硝酸法蒸解について

ウエン・バン・バ , 田島俊雄

1977 年 31 巻 10 号 p. 707-715
発行日: 1977年
公開日: 2009/11/11

DOIhttps://doi.org/10.2524/jtappij.31.10_707

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Reed 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.

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