巻号一覧
前身誌
49 巻, 6 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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橋本 城二1995 年 49 巻 6 号 p. 903-910
発行日: 1995/06/01
公開日: 2009/11/16
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鮎川 弘志1995 年 49 巻 6 号 p. 911-919
発行日: 1995/06/01
公開日: 2009/11/16
ジャーナル フリーThe fiber orientation is one of most important characteristics of papers, which cause market's troubles of all kind of papers, if it is out of correct ranges.
The fiber orientations are desired near zero degree. We converted these fiber orientations to the parameter of S/N ratio, and applied this parameter in actual process control.
We measured fiber orientations of every turnup, and analysised the trend of S/N ratio by the control chart.
It caught the changes of fiber orientations sensitively, and we could take the correct actions to process.
By this applications of S/N ratio, we got the stability of process, and we could keep many paper products from out of specifications.
By the application of S/N ratio to papermaking process, we get the quality advancement of paper products.抄録全体を表示PDF形式でダウンロード (1094K) -
岩崎 誠1995 年 49 巻 6 号 p. 920-930
発行日: 1995/06/01
公開日: 2009/11/16
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開発の現状レヒティネン ユッカ1995 年 49 巻 6 号 p. 931-942
発行日: 1995/06/01
公開日: 2009/11/16
ジャーナル フリーコンデベルト乾燥法においては, ウェブは片面が 2枚重ねのワイヤ (このうち目の細かい方がウェブに接する) に接した状態で, 2つのスチールバンド間の空気の無い環境で乾燥される。ウェブのもう一方の面に直接接するスチールバンドは高温に保たれ, 目の粗いワイヤに接するスチールバンドは低温に保たれる。
乾燥率は非常に高く, ウェブの単位接触面積あたりで, 従来のシリンダ乾燥の5～15倍程度の乾燥率が得られる。ウェブには優れた繊維結合強度が与えられる。ライナーボードの乾燥に最適な高いZ方向加圧力 (3～8気圧) で乾燥すると, シングルパス (片面乾燥ドライヤ) から出てくるウェブは片面にはワイヤマークが残るが, 一方の面は平滑で光沢を有した面となる。
コンデベルト乾燥には3つの基本的な乾燥方式がある。高加圧力型, 低加圧力+プレあるいはブースターヒーティング型, および, 短い高圧力ゾーンを設けた低加圧力型の3つである。これらのうち一番目の型は, ライナーボード, 中芯原紙および箱用板紙の乾燥に適し, 二番目の型は, 多種の印刷用紙および一部の板紙に適する。三番目の型は, 通常MGドライヤを使用する紙種用である。
コンデベルト乾燥は1975年に研究が開始され, 多数の静的なユニットが造られた。現在のものは高加圧力型以外のコンデベルトもシミュレートできるが, 主として高加圧力型での製品品質の研究のために使用されている。
バルメット社は実用機ベースのコンデベルトパイロットマシンを持っており, 5気圧の蒸気圧力, 600m/minの速度で良好に運転されている。乾燥ゾーンの長さは18mで, 700mm幅のウェブをドライネス約40%から必要な最終ドライネスまで乾燥させることが可能である。カスタマートライアルでは, ドライネス40～50%のウェブをオフラインのロールスタンドからコンデベルトに送る, あるいは, パイロットマシンによって抄造した紙をオンラインでコンデベルトに送るという2種類の異なった運転を行うことができる。抄録全体を表示PDF形式でダウンロード (1575K) -
山田 卓良1995 年 49 巻 6 号 p. 943
発行日: 1995/06/01
公開日: 2009/11/16
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阿部 善作1995 年 49 巻 6 号 p. 944-950
発行日: 1995/06/01
公開日: 2009/11/16
ジャーナル フリーThe AMA (alkali-methanol-anthraquinone pulping) process was invented by Z. Abe of Kyushu University in 1982. The Organocell process was improved and changed to the same pulping process as AMA process. On Sept. 1992, Organocell started up a 150, 000 ton/yr Organocell mill in Germany.
This investigation was carried out to get a better understanding about AMA. Delignification rates and selectivity in AMA were compared with these in kraft, alkali-methanol, and soda-anthraquinone pulping. Methanol extractives-free wood meal (24-48 mesh) of beech (Fagus crenata) and pine (Pinus densiflora) were used as raw materials. Each pulping was done under the same active alkali charge.
The results were summarized as follows :
(1) The delignification rate in AMA was faster than twice of that in kraft pulping.
(2) Methanol and anthraquinone, respectively, accelerated the delignification in AMA.
(3) Softwood as well as hardwood as raw materials was easily pulped by AMA.
(4) The selectivity of AMA was better than that of kraft, alkali-methanol, and soda-anthraquinone pulping.
(5) AMA process seems to be the best alternative to kraft pulping process.
(6) The main subjects on AMA process are left as follows ; washing process, bleaching process and sequences, mechanism of delignification and pulping, chemicals recovery process, economic evaluation.抄録全体を表示PDF形式でダウンロード (2029K) -
動的走査吸液法による紙の吸液特性の解析 (第1報)片岡 浩史, 空閑 重則, 尾鍋 史彦1995 年 49 巻 6 号 p. 951-955
発行日: 1995/06/01
公開日: 2009/11/16
ジャーナル フリーNewly developed automatic scanning absorptometry (DSA) was employed to investigate the liquid absorption behavior of handsheets prepared with various basis weights, wet-pressing and calendering conditions. While increased basis weight (from 40 g/m2 to 80 g/m2) caused 7-10 fold increases in the Stoeckigt sizing degree, the short-time absorptivity determined by DSA was moderately enhanced by the same change, showing opposite tendencies. The influences of wet-pressing and calendering were also remarkably different for Stoeckigt values and DSA-absorptivity. While linseed oil absorptivity was sensitive to compaction of paper by calendering, the water absorptivity only reflected the change in surface roughness. This behavior confirms that compaction of paper web through calendering is cancelled by reswelling by water.抄録全体を表示PDF形式でダウンロード (1966K) -
第5報厚さ方向に非対称な強度をもつ複両面段ボールの場合松島 成夫, 矢野 忠, 松島 理1995 年 49 巻 6 号 p. 956-966
発行日: 1995/06/01
公開日: 2009/11/16
ジャーナル フリーAnalysis of the bending stress is performed for double wall corrugated fiberboard (DWFC) with asymmetrical strength distribution along the direction of thickness of the kraft-liner (KL). Relations are investigated between maximum absolute stresses of elements for DWCF (σs1max, σs2max, σk1max, σk2max and σk0max) and shapes for upper KL (Upper KL1, lower KL2 and middle KL0) or semi-chemical corrugated medium (SCP medium : upper CM1 and lower CM2). Obtained results are as follows ;
(1) Vertical distance h0 from the outer surface of KL2 to the neutral surface of DWFC increases with increasing modulus Ek1 of longitudinal elasticity. thickness TK1 for KL, and thickness Ts1 and waveheight h1 for CM1. It decreases initially and then approaches constant gradually with the increase of wavelength L1 for CM1.
(2) Stresses in KL and SCP medium are proportional to the distance from the neutral surface to the point interested in. σs1max, σs2max, σk1max, σk2max and σk0max occur at the outermost positions, that is, on the outermost surfaces for CM1, CM2, KL1, KL2 and KL0.
(3) σs1max decreases remarkably or slowly with the increase of Ts1, Ek1, Tk1, and thickness Tk0 for KL0 but increases with the increase of L1. It increases initially, attains maximum and then decreases gradually with h1. σs2max increases initially, attains maximum and then decreases gradually with of Ek1, Tk1 and Tk0 It decreases with the increase of Ts1 and h1.
(4) σk1max decreases remarkably with the increase of Ts1, Tk1 and Tk0, but increases with the increase of L1 and Ek1. It also increases initially, attains maximum and decreases gradually with the increase of h1.
While σk2max decreases with the increase of Ts1 and Tk0, and increases with the increase of L1. But it increases initially, attains maximum and then decreases gradually with the increase of h1, Ek1 and Tk1.抄録全体を表示PDF形式でダウンロード (2844K) -
ユーカリの材質育種における選抜指標抽出に関する研究 (第3報)小名 俊博, 園田 哲也, 伊藤 一弥, 柴田 勝1995 年 49 巻 6 号 p. 967-974
発行日: 1995/06/01
公開日: 2009/11/16
ジャーナル フリーWithin-tree variations, whole-tree values and the representative heights for the whole-tree values of lignin content and lignin S/G ratio by thioacidolysis were analysed for Eucalyptus camaldulensis and E. globulus to do quality breeding using an increment core without cutting the tree.
Within-tree variations of lignin content in both species were very small. In contrast, lignin S/G rations were higher in pith side and upper part of E. camalduensis, and were very different between trees of E. globulus.
The whole-tree content of lignin and lignin S/G ratio were 23. 2, 21. 8%, and 1.85, 1.71 for E. camaldulensis, and 18.0, 15.3%, and 3.16, 3.78 for E. globulus. Since the whole -tree content of lignin was lower, and that of lignin S/G ratio was higher in E globulus, E. globulus would have higher pulp yield and digestability.
Representative heights, the whole-tree contents ± 5%, of lignin content and lignin S/G. ratio were calculated below 3.3 m height to consider for sampling of an increment core. The results were 2.32.8 m for E. camaldulensis, and 0.31.8 m and 3.3 m for E. globulus, regardless to the whole-tree height and the difference of within-tree variation of lignin.
It is expected that whole-tree pulp properties are predicted by the increment core taken from these representative heights.抄録全体を表示PDF形式でダウンロード (1128K) -
1995 年 49 巻 6 号 p. 975-985
発行日: 1995/06/01
公開日: 2009/11/16
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板状物体後流の制御装置山田 勝彦, 杉長 正雄1995 年 49 巻 6 号 p. 986-989
発行日: 1995/06/01
公開日: 2009/11/16
ジャーナル フリーPDF形式でダウンロード (523K)
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