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52 巻, 4 号
選択された号の論文の15件中1～15を表示しています
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産業構造審議会資料1998 年 52 巻 4 号 p. 449-457
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーThe demand for paper has been relatively steady for these few years. The profit on sales, however, has been declining, e.g. 5.4% in 1995, 4.6% in 1996 and 3.6% in 1997. Unfavorable prospect such as the capital cost increase, less export due to unstable Asian economy and soft market by the increased domestic capacity will reduce the profit further in 1998.
The capital investment by the fifty companies in 1996 was 357 billion yens and that in 1997 would be 400 billion yens. The figure in 1998 will be about 70% of that in 1997.
The expected investment in the coming five years is classified for subjects as follows. Manufacturing process : 27%, maintenance : 22.7%, labor saving : 22.5%, renewal : 13.2%, environment : 5.7%, energy saving : 4.8%, R & D : 1.2% and others : 3.0%. After finishing new expansion projects, the investment for manufacturing will dwindle.抄録全体を表示PDF形式でダウンロード (1174K) -
マルコッチア B. S., ストロンバーグ B., プロー J. R., 川上 千明1998 年 52 巻 4 号 p. 458-468
発行日: 1998/04/01
公開日: 2010/04/23
ジャーナル フリーLong term production data from two independent installations have shown a 4 to 5% increase in hardwood yield for digesters converted to Lo-SolidsTMcooking. The following paper will present and discuss this data along with the results, to date, from a program aimed at identifying the underlying mechanism responsible for increased yield. As part of this program, a methodology for rapid yield determinations based on chip, pulp, and black liquor testing has been developed. Preliminary results for samples collected from one mill have confirmed a 3 to 4% greater pulp yield for the commercial process as compared to a laboratory generated pulp cooked to the same degree of delignification. This paper concludes with a description of planned future work.抄録全体を表示PDF形式でダウンロード (3451K) -
伊藤 仁, 岡本 将1998 年 52 巻 4 号 p. 469-475
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーThis substance relates to a calcium carbonate scale deposit inhibitor for a continuous digester used in making kraft pulps.
Calcium ions leached from wood chips react with carbonate ions in the system, and calcium carbonate is precipitated and deposited on the inner wall of digester. Therefore, some scale deposit inhibitors are used for continuously controlling scale deposition. However, none of the inhibitors proposed gives satisfactory results for controlling the scale deposition, especially in the calcium-rich cooking liquor. As a result of extensive investigations, we developed an effective scale deposit inhibitor “DEPONAXR P-36” for a calcium-rich cooking liquor.抄録全体を表示PDF形式でダウンロード (2475K) -
塩素漂白からECF漂白への転換-環境面からの一考察ミューラー レナート, スヴェルド ソルヴィ・ヘルスタッド, バスタ ジリ, ヴェーン ゲルト1998 年 52 巻 4 号 p. 476-484
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーThe global bleaching technology trend is a change from chlorine gas bleaching to ECF. This segment for kraft pulp has grown from a share of 5% in 1990 to a share of 50% in 1997. We believe that this trend will continue and the chlorine gas will eventually be totally phased out.
The development of the lignin reduction technology of the unbleached pulp like extended cooking and more effective oxygen delignification will continue and technologies for bleach plant effluent closure will be a reality within the nearest years.
A comparative laboratory characterization study was carried out on effluents from ECF bleached, conventional and oxygen predelignified, softwood and hardwood pulps. Combined and separate streams were characterized and selected effluents were exposed to biological treatment. These studies were carried out both prior to and after biological treatment. The characterization of the main COD components ; lignin, carbohydrates, methanol, low molecular acids and extractives corresponded well with the calculation of the total organic composition.
Since approximately 50% to 70% of the total bleaching effluent COD and colour were found in the alkaline filtrates, the concept of recirculationg those filtrates to the recovery system offers a great potential for reducing the discharge of, not only the total COD, but also its specific components, into receiving water bodies.抄録全体を表示PDF形式でダウンロード (6332K) -
ヤカラ ユッカ, パレン アルト, レンヴァル イルッカ, アクセラ レイジョ1998 年 52 巻 4 号 p. 485-492
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーThe effects of chelating agents, peracetic acid and alkaline peroxide on the replacement of chlorine dioxide and hypochlorite in D-Eo-H-D bleaching of oxygen delignified hardwood kraft pulp were studied in a laboratory scale. Since an increased use of peroxygen chemicals necessitates a use of a chelating agent, both DTPA and a new chelating agent with low nitrogen content (DEAS) were tested. Peracetic acid was used here as a bleaching agent in combination with chlorine dioxide in a D2 stage. Also the effect of peracetic acid on post-bleaching of O-D-EOP-D bleached softwood kraft pulp was studied.
The bleaching experiments indicate that the importance of a chelation prior to Eo stage increases with the decreasing active chlorine charge in the D1 stage and increasing peroxide charge in the E. stage. With a sequence of Q/D-EOP-Q/D/PAA the total active chlorine charge in D-Eo-H-D dropped from 48 kg act. C1/tp to 20 kg act. C1/tp by using 10 kg H2O2/tp in the E0 stage and 5 kg peracetic acid/tp in the D2 stage. Also 8 kg hypochlorite/ tp were eliminated at the same time. The use of DEAS in the Q/D stage gave more improved pulp properties for bleached pulp than the use of DTPA correspondingly.抄録全体を表示PDF形式でダウンロード (2805K) -
開発の歴史そして今日の課題斎藤 邦昭1998 年 52 巻 4 号 p. 493-502
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーDr. J. Richter, the inventor of the continuous cooking systems, passed away on 13 June 1997 in his 96 th year. In remembrance of the great contribution Dr. Richter made to the development of pulping industry, this paper gives a retrospective review of the progress of cooking systems development as well as views on the requirements to be discussed in the future.抄録全体を表示PDF形式でダウンロード (2522K) -
スクリーニングシステムの再構築岩重 尚之1998 年 52 巻 4 号 p. 503-509
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーThe MFC/MF Screen, developed by Ishikawajima Industrial Machinery Co., was introduced in the annual meeting of JAPAN TAPPI last year.
The MFC/MF Screen will enormously reduce the reject rate and extensively simplify the conventional screen system, while keeping the screening efficiency of the accepted pulp. In consequence, the MFC/MF Screen will reduce both initial and running cost by approximately 50 percent compared with the conventional screen system.
Herewith, some of the field data of the MFC/MF Screen are presented for reference to understand how the performance are superior.抄録全体を表示PDF形式でダウンロード (2417K) -
AWN 型ダブルデイスクリファイナーおよびADF型ダブルフレーカー金沢 毅, 藤田 和巳1998 年 52 巻 4 号 p. 510-519
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーAs it has been said that paper is produced by means of a beater since a long time ago, it has been recognized among paper making engineers that refining is the most important technology in stock preparation room, especialy for high grade papers, in order to extract different characteristics from original pulp. In advance of the refining, pulp should be completely defibered by a deflaker. As understanding, those machins (refiners & deflakers) consume large amount of energy. So that the most appropriate disign must be done in order to achieve energy saving as well as easy maintenance to reduce man power cost. This paper reports the latest design of the refiner and deflaker which are marketed by Aikawa.抄録全体を表示PDF形式でダウンロード (11424K) -
製紙における高温カレンダロールの展開松本 雄三1998 年 52 巻 4 号 p. 520-524
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーAn induction heated jacket roll is regarded as an ideal heat roll, which gives uniform surface temperature with a good CD profile.
Traditional heat rolls which use heated thermal medium produce uneven temperature profiles and cause higher temperature at the both ends of the rolls. This results in variation in a roll diameter CD profile and finally results in sheet thickness variation.
The roll of this paper has an induction heat device inside and is jacketed like a heated pipe. With the combined effect by them, the temperature variation in a radial direction is compensated and the roll CD diameter profile is very well stabilized.
Now, super soft calender rolls with a max. temperature of 360 degree C are successfully in operation.抄録全体を表示PDF形式でダウンロード (1860K) -
田尻 登志朗, 峪田 宜明1998 年 52 巻 4 号 p. 525-529
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーThis study was carried out for selecting winder drums having the most suitable surface for paper winding process. Higher friction coefficient between the winder surface and paper is required. In this paper, thermally sprayed WC-Co coating are compared with the conventional Mo ones. Our results showed that the winder surface prepared by WC-Co coatings is superior to the conventional ones in terms of friction coefficient, erosion resistanat and smoothness.抄録全体を表示PDF形式でダウンロード (5499K) -
紙パルプ技術協会 会誌編集委員会1998 年 52 巻 4 号 p. 530-531
発行日: 1998/04/01
公開日: 2010/02/22
ジャーナル フリーPDF形式でダウンロード (289K) -
太田 節三1998 年 52 巻 4 号 p. 534
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (2355K) -
野々村 文就, 阿部 裕司, 竹内 伸夫1998 年 52 巻 4 号 p. 535-542
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーDimensional stability, especially paper curl is one of the most important properties of paper. Paper curl caused by heatroller heating in copymachines and laserprinters, influences the runnability and the end quality of paper. Recently, curl specifications have become more stringent as the development of hardware has progressed. In this study, we made a heatroller heating apparatus with variable heating conditions to investigate the relationship between different heating conditions and the resulting curl behavior. The apparatus utilizes a high pressure nip with one high temperature roll and one low temperature roll to induce non-uniform heating of the paper.
Results of this paper show that the curl behavior induced by heatroller heating is influenced by different heating conditions, such as heating temperature, heating speed, and nip width. There is a direct relationship between heating time and paper curl, however, this relationship is affected greatly by changes in the pre-heated moisture content of the sheet. All of these factors have a large influence on how much moisture is lost during the heating process. When the reduction of moisture content is small, curl toward heated side occurs. On the other hand, when the reduction of moisture content is large, curl toward unheated side occurs. The roll nip restrains paper shrinkage in direction of roll pivot, thus the direction in which the paper is feed influences the curl axis. This is useful knowledge when designing a grade of paper where curl is an important property.抄録全体を表示PDF形式でダウンロード (2629K) -
1998 年 52 巻 4 号 p. 543-548
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (9961K) -
段ボールシートの接着不良検出方法及び装置蓮池 広美1998 年 52 巻 4 号 p. 549-552
発行日: 1998/04/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (718K)
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