巻号一覧
前身誌
28 巻, 8 号
選択された号の論文の9件中1～9を表示しています
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堀 義雄1974 年 28 巻 8 号 p. 334-338
発行日: 1974/08/01
公開日: 2009/11/10
ジャーナル フリーPDF形式でダウンロード (2378K) -
-問題点と動向-長船 寛1974 年 28 巻 8 号 p. 339-344
発行日: 1974/08/01
公開日: 2009/11/10
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高橋 嗣郎1974 年 28 巻 8 号 p. 345-348
発行日: 1974/08/01
公開日: 2009/11/10
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-BLRBAC 最終結論-坂本 英雄, 一色 昭男1974 年 28 巻 8 号 p. 349-351
発行日: 1974/08/01
公開日: 2009/11/10
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1974 年 28 巻 8 号 p. 352
発行日: 1974/08/01
公開日: 2009/11/10
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1974 年 28 巻 8 号 p. 353-355
発行日: 1974/08/01
公開日: 2009/11/10
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石黒 久三郎1974 年 28 巻 8 号 p. 356-367
発行日: 1974/08/01
公開日: 2010/01/22
ジャーナル フリーWith ever increasing paper machine speed, it has become desirable to minimize the sheet moisture content at the exit of press in order to maintain higher production efficiency and higher drying efficiency.
For this purpose, elastoma cover materials for press rolls are to be kept as hard as possible and also nip pressure as high as possible, which is recent fundamental designing theme of high speed paper machine press part. This, however, constitutes a very severe condition for elastoma covered rolls and cover damages have taken place on press rolls in high speed paper machines.
The reasons of these damages are mechanical problems and elastoma cover internal heat generation by hysteresis, both of which are caused by the above mentioned condition (i.e, high nip pressure at high speed). The hysteresis problem cam not be neglected as the machine speeds become higher. This paper shows results of analysis of this problem and calculates how much power is absorbed for internal heat generation in relatoin to total press section power consumption. These calculations were made on the basis of actual operating conditions on two machines. The calculations of actual amount of internal heat generation was also made by knowing the measurable factors for power consumption.
Another investigation was performed by using experimental apparatus and a covered roll as a model at which point the generated internal heat damages the cover. It was found that the damage occurs when heat generating amount per rubber cover unit weight reaches up to 0.0840.087 kcal/kg/sec.
In case of the two machines mentioned, nip pressure were 80 kg/cm, and machine speed was 600 m/min for one and 720 for the other. The generated heat was measured to be 0.0210.024 kcal/kg/sec. So, in these two cases, thermal safety factor is 34. In a machine of this size, however, if machine speed goes up to 1, 000 m/min, heat generation radically increased to 0.044 kcal/kg/sec (safety factor : 2), which will probably causes operation and maintenance trouble for elastoma covered rolls.
Temperature distribution in the elastoma cover by internal heat generation appears higher from the surface to the inside.
I would like, however, to leave this problem as a theme to be investigated in the future.
The cover material tested in this report was polyurethane type synthetic material (hardness P & J 5).抄録全体を表示PDF形式でダウンロード (3516K) -
BOD 除去機構および処理条件の検討と連続法処理上嶋 洋, 赤松 勲1974 年 28 巻 8 号 p. 368-377
発行日: 1974/08/01
公開日: 2009/11/10
ジャーナル フリーIt was previously reported that ozone treatment of sulphate pulp waste water had lead to the very large removal efficiencies of COD (Mn) and color, and had lead to the formation of BOD components.
In this report, the mechanism of BOD removal and treatment conditions in activated sludge treatment of the ozonized liquor of diluted black liquor were studied. The results obtained were as follows.
1. The BOD removal rate was elucidated by the Eckenfelder equation, the two phase theory, and at the lower BOD concentration it was found that BOD removal was proceeded in phase II. When initial BOD was about 600 mg/l, the reaction rate of BOD removal could be expressed approximately as the first order, and when initial BOD was from 100 to 200 mg/l it could be expressed approximately as the second order.
2. BOD removal efficinecy more than 90% was achieved at less than 0.5 kg-BOD/kg-MLVSS· day, as well as that of the other pulping waste water.
3. Sludge yield was the same or less as that of the other pulping waste water. Total consumed oxygen was in the range of that of the other pulping waste water.
4. In the case of the ozonized liquor containing a few quantity of ozone (4.015 mg/l), BOD removal efficiency did not decresse at the lower BUD loading (less than 0.4 kg-BOD/kg-MLVSS· day), but it largely decreased at the higher BOD loading.
The sequential ozone-activated sludge treatment of diluted black liquor was also experimented. As a result, the total removal efficiencies of COD (Mn) and BOD were depended upon the removal efficiencies of ozone treatment and activated sludge treatment.
Even if the remaining ozone in the effluent of stirring treatment and in the gas supplied to the aeration tank were about 0.4 mg/l, 0.08 mg/l respectively, the total removal efficiencies of COD (Mn) and BOD were 61.6%, 87.5% respectively, with nearly satisfactory results.
Removal efficinecies of lignin and color were depended upon that of ozone treatment. By stirring treatment and activated sludge treatment, the concentration of two indexes reversely increased. The total removal efficiencies of lignin and color were 66.6%, 81.5% respectively.抄録全体を表示PDF形式でダウンロード (2186K) -
第6報 酸素・アルカリ処理によるアカマツMWLの分解について十河 村男, 幡 克美1974 年 28 巻 8 号 p. 378-386
発行日: 1974/08/01
公開日: 2010/01/22
ジャーナル フリーアカマツMWLをNaOHとNaHCO3から調製したpH13.5, 10.4, 8.4のアルカリ液中で加圧酸素下にTable 1 の条件で酸素・アルカリ処理 (OA処理) した。その反応液について, ゲル濾過分別曲線, UV-吸収スペクトル, 弱酸性解離基, COD, BODを測定し, さらにエーテル可溶性の低分子量分解生成物質をGLCで検索し, 一部の物質についてはTLCも行なった。結果を要約すると次のようである。
1) pH13.5のアルカリ液でOA処理した場合, 70℃でも少量の低分子量区分の生成が認められ, 90℃, 120℃さらに140℃と処理温度を高くすると酸性解離基を多く生成し, 低分子量物質に分解する。
2) pH8.5でOA処理した場合, 90℃以下では一部難溶性物質として回収され, 120℃以上では溶解するが高分子量区分も残されている。
3) 120℃以上, pH13.5のアルカリ性でOA処理すると, BOD/COD比は0.6～0.7であり, pHの低い場合よりも大きな値を示した。このことから木材を酸素・アルカリ蒸解した廃水は, 普通のソーダ法蒸解廃水に比して, 溶出したリグニンは微生物の作用をうけ易いことを示唆している。
4) 低分子量の分解生成物質は Table 3 に示したようで, とくにメタノールの生成量が多く, pH13.5のOA処理では比較的多くの酢酸が認められた。諸家の報告にみられるリグニン酸化分解生成物質のほかに, 微量のアセトンの生成が示されたことは興味深い。
このような結果から, OA処理におけるアルカリ液のpHがリグニン分解反応に大きな影響をもたらすこと, とくにアルカリ液のpH13.5とpH10.4以下とではリグニン分解反応に大きな相違のあることが示唆された。抄録全体を表示PDF形式でダウンロード (1570K)
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