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45 巻, 12 号
選択された号の論文の11件中1～11を表示しています
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桃原 郁夫, 松本 雄二1991 年 45 巻 12 号 p. 1297-1315
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーRecent advances in the knowledge of ligninolytic enzyme system and recent trial to apply biological system to pulping and bleaching process are reviewed. Although a remarkable progress in the enzymology of lignin biodegradation was achieved in these ten years, the application of ligninolytic system to pulping and bleaching is not very successuful. Enzymatic degradation of carbohydrate, on the other hand, has been found to be useful for bleaching and fiber modification.抄録全体を表示PDF形式でダウンロード (3484K) -
下戸 秀聡, 社領 正樹, 桐山 泰輔, 坂口 博脩1991 年 45 巻 12 号 p. 1316-1334
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーIndustrial enzymes have been used in numerous industrial applications for many years as a very effective natural catalyst without affecting the environment. Such catalytic power with its high specificity and reaction under mild conditions has been investigated in the area of pulp and paper and some of the applications have been successfully introduced to the real production line.
Here industrial enzymes and the possibilities of their application in this field are introduced based on the information obtained from literature and patents, as well as from authors' application work.抄録全体を表示PDF形式でダウンロード (3542K) -
佐野 充洋1991 年 45 巻 12 号 p. 1335-1340
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーPaper damping material made of paperbord and viscoelastic polymer has remarkable damping capacity. Particularly, combination of recycled paper and viscoelastic polymer shows superior ability. This damping material is useful not only to make good use of forest resources but also to support comfortable life.抄録全体を表示PDF形式でダウンロード (1001K) -
松井 武司, 浜野 明人1991 年 45 巻 12 号 p. 1341-1347
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーVoids-containing synthetic paper has similar properties of natural paper: lightness, softness, etc, due to containing a large number of fine voids made in stretching process. These are useful for handling and printing. At the same time it is excellent in water resistance, dimensional stability due to moisture adsorption, surface smoothness, etc.
Therefore, practical uses of it have been developed in recent years as base material for recording paper, etc.
However, voids-containing synthetic paper has some disadvantages: inferior in stiffness, surface strength and productivity than those of other film-base synthetic paper. Multi-layer filming process is applicable to these problems. Mor over, it is necessary to give proper surface treatments for printing, transfering, copying and so on.抄録全体を表示PDF形式でダウンロード (2087K) -
小林 成吉, 八田 章文1991 年 45 巻 12 号 p. 1348-1362
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーThe stock preparation refining is considered the most important stage in paper making process. Not only it affects runability of paper machine but it determines quality of paper. And it influences furnish composition and energy consumption which directly influence production cost. The Conflo refiner have a shallow cone angle and short cone. These features ensure long stock retention time inside of refining zone and stable gap clearance. As a result, fibers get gentle, homogeneous treatment which cause a better tear-tensile combination, or a better tensile strength at the same freeness. The Conflo refiner can also keep lower idling power by virtue of increasing effective refining surface area with minimum increase in outer diameter of fillings.抄録全体を表示PDF形式でダウンロード (3297K) -
遺伝子操作の方法と実際佐渡 篤, 川合 伸也1991 年 45 巻 12 号 p. 1363-1374
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーMethods and practice of gene manupulation technique were explained for the production of human insulin. The DNA synthesizing and DNA sequencing were outlined with a few examples. Furthermore, peculiarity in studying gene technology was also described.抄録全体を表示PDF形式でダウンロード (3189K) -
山田 卓良1991 年 45 巻 12 号 p. 1375
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーPDF形式でダウンロード (265K) -
厳 泰振, 呉 世均1991 年 45 巻 12 号 p. 1377-1382
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーA new deinking method for old news paper was developed by using commercially available cellulase. About 300 g of old news paper was defibered at 4% pulp consistency by batch type pulper in the enzymeadded water in which pH was controlled at 4.7. And then the suspension was transferred to a laboratory floatation system. The following results were obtained with the deinked pulp from the above-described process.
(1) Handsheet from the DIP showed a satisfactory level of brightness.
(2) Defibering time was reduced significantly, compared to conventional method.
(3) The Canadian standard freeness showed a reduced value for the DIP compared with that from the conventional method. Consequently, an increase in sheet strength was obtained with handsheet from the DIP.
(4) During the defibering and floatating process by this enzymatic technique, no other additives than enzyme and buffer were required, such as NaOH, water glass, synthetic displector, carboxylic acid soap, hydrogen peroxide and DTPA. Therefore, the substantial reduction in operation cost and treating cost with the effluent liquor are estimated by adopting this enzymatic method.抄録全体を表示PDF形式でダウンロード (1064K) -
腐朽菌, カワラタケ, Phanerochaete chrysosporiumによる機械パルプの色戻り抑制について山下 民治, 鹿毛 裕司, 橘 燦郎, 住本 昌之, 大島 喜八郎, 桑原 正章1991 年 45 巻 12 号 p. 1383-1391
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーPre-treatment of unbleaced thermomechanical pulp and unbleached groundwood pulp with extracellular crude enzyme solutions from Phanerochaete chrysosporium and Coriolus versicolor, respectively, belonging to white-rot fungi followed by alkaline hydrogen peroxide bleaching gave a remarkable effect on depression of heat-induced color reversion of thermomechanical pulp (TMP) and groundwood pulp (GP), respectively. The effect of depression of heat-induced color reversion by treatment of unbleached TMP with an extracellular crude enzyme solution from P. chrysosporium seems to be related to the pH value in the culture solution. The color reversion was greatly suppressed when the culture solution have lower pH value, especially under pH 4. 6. This suggests that the enzyme from P. chrysosporium responsible for depression of the color reversion is a kind of inducible enzyme by decrease in pH value in the culture solution during incubation. And furthermore, the enzyme responsible for depression of the color reversion was found to be strongly inhibited by heat treatment or by addition of sodium cyanide.
Furthermore, pre-treatment of unbleached GP with an extracellular crude enzyme solution from C. versicolor, followed by hydrogen peroxide bleaching was found to be very effective to the depression of light-induced color reversion of GP. However, no effect of depression of light-induced color reversion was observed by the treatments of both, GP and TMP with the extracellular crude enzyme solution from P. cioysosporium. This suggests that TMP and GP have some different chromophores contributing to the light-induced color reversion. Based on the results of the reactivity between a model compound and extracellular crude enzymes from C. versicolor, the enzyme responsible for depression of light-induced color revesion of TMP is a kind of oxide -reductase because reduction products as well as oxidation products are recognized in the reaction products.抄録全体を表示PDF形式でダウンロード (1489K) -
酢酸水溶液による針葉樹材のパルプ化金子 尚史, 佐野 嘉拓, 笹谷 宜志, 大谷 諄1991 年 45 巻 12 号 p. 1392-1399
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーAcetic acid-water and acetic acid-water-phenols systems were investigated as new solvents for solvent pulping of softwoods.
Todomatsu (Abies sachalinensis Masters) was delignified readily in 70-90% aqueous acetic acid with or without phenols as delignification accelerants at 170-180t. Karamatsu (Larix leptolepis Gord) was very difficult to delignify under the conditions without phenols, and it yielded pulps with Klason lignin content of over 15%. But the delignification of Karamatsu was improved considerably by cooking with aqueous acetic acid containing phenols. More than 85% of p-cresol as the phenols were recovered respectively from the waste liquors of todomatsu and karamatsu.
Strength properties of the pulps were comparable to those of softwood kraft pulps except for tear factor. Acetic acid lignins were separated in greater yields from the waste liquors, but yields of sugar products were lower. Acetic acid lignins of AWL-1 were found to be useful for chemicals because of the higher contents of phenolic hydroxyl groups.抄録全体を表示PDF形式でダウンロード (1826K) -
1991 年 45 巻 12 号 p. 1400-1407
発行日: 1991/12/01
公開日: 2010/10/27
ジャーナル フリーPDF形式でダウンロード (1333K)
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