巻号一覧
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47 巻, 2 号
選択された号の論文の16件中1～16を表示しています
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藤原 弘教1993 年 47 巻 2 号 p. 179-183
発行日: 1993/02/01
公開日: 2009/11/19
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中島 繁男1993 年 47 巻 2 号 p. 184-191
発行日: 1993/02/01
公開日: 2009/11/19
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冨増 弘, 秦 邦男1993 年 47 巻 2 号 p. 194-195
発行日: 1993/02/01
公開日: 2009/11/19
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1993 年 47 巻 2 号 p. 196-204
発行日: 1993/02/01
公開日: 2009/11/19
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浦西 , 黒田 , 安達1993 年 47 巻 2 号 p. 205-208
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーラウンドテーブルディスカッションは製紙メーカー及び関連業界の技術者が, 日常携わっているテーマについて共通の立場から自由に意見を交換しあうという趣旨で年次大会の前日に行われている。会議は非公開なので, くわしく内容をご紹介することはできないが, どの様な事柄が話題になったかを知ることで問題の焦点がつかめるものと思う。抄録全体を表示PDF形式でダウンロード (580K) -
小島 康夫1993 年 47 巻 2 号 p. 213-233
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーThe Worldwide concern over environmental control has motivated a search for new process that will eliminate the problem of pollution at the source. Example are new bleaching proceses that employ chemicals not used in conventional bleaching stages. Recently, increasing research and development efforts are being directed toward the use of ozone as a new bleaching agent for chemical pulps. Because ozone has good delignified and brightning abilities without no production of chlorinated organic compounds, it is an attractive candidate for replacement of chlorine-based bleacing agents.
In searching for the best way of using ozone in chemical pulp bleaching, it is useful to examine the literature for detail of previous applications. Since 1868, numerous studies have been carried out on a wide range of topics dealing with ozone bleaching. This paper covered current reports and also includes usefull early works of them.抄録全体を表示PDF形式でダウンロード (3038K) -
アルキルケテンダイマー系サイズ剤の効果促進機能について近藤 則男, 牧野 重人1993 年 47 巻 2 号 p. 234-238
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーRecently the conversion from acid size system to neutral/alkaline size process is progressing in papermaking, especially in the production of coated base and PPC paper.
In neutral/alkaline papermaking, AKD (alkyl keten dimers) is widely used as internal sizing agents because it can be handled easely in the form of aqueous emulsions.
But AKD has a disadvantage, namely, low response of sizing developement on machine.
In this paper, we tested some kinds of cationic polymers compared with cationic starch as retention aids, and discussed mechanism of enhancing AKD sizing.
Test results show specialized cationic polymers are most effective on enhancing sizing efficiency of AKD.
We believe AKD sizing system using such specialized cationic polymers will be widely developed in the neutral/alkaline papermaking.抄録全体を表示PDF形式でダウンロード (896K) -
H. C Holm, S Skjold-Jorgensen, N Munk, L. Saaby Pedersen1993 年 47 巻 2 号 p. 239-243
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーThe use of enzymes to improve the bleachability of kraft pulp is under trial at several pulp mills around the world. This paper presents results obtained with a cellulase free xylanase preparation working at neutral pH and temperatures below 55°C. By bleach boosting birch and eucalyptus pulp it is possible to reduce the amount of active chlorine (ClO2) used by 32% and 28% respectively.
The xylanase bleach boosting is obtained by a very selective hydrolysis of a minor part of the xylan which has reprecipitated unto the fibres after the kraft cook.
It is shown how it is beneficial to use bleach boosting prior to ozone bleaching.
We believe it will be possible to find enzymes with such high pH and high temperature activity that they are applicable for bleach boosting treatments within the closed chemical recovery loop.抄録全体を表示PDF形式でダウンロード (674K) -
山本 光雄, 三浦 洋司, 広田 和男, 槇野 勝昭, 鈴村 洋1993 年 47 巻 2 号 p. 244-253
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーBlade type coaters have been required for higher speed application and higher productivity.
However, conventional blade coater designs occasionally produce non-uniform coating, which is called “Streaks”, when applying heavy weight coating (over 10 g/m2/side) at high speeds (over 1, 000 m/min).
In this paper, we analyzed the mechanism generating streaks and introduce a newly developed high speed blade coater which can successfully apply uniform coating at high speeds over a wide range of coat weights.抄録全体を表示PDF形式でダウンロード (1345K) -
Risto Turunen1993 年 47 巻 2 号 p. 254-259
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーThis paper presents results from pilot machine experiments together with production machine data on the use of film size presses for pigmentizing. Since the paper surface characteristics depend greatly on the type of calender used, some soft calendering results achieved with pigmentized paper are presented. The new equipment needed for manufacturing papers of this type is also described. It is shown that a modern film size press combined with a soft calender is a viable solution for grade improvement.抄録全体を表示PDF形式でダウンロード (595K) -
飯塚 尭介1993 年 47 巻 2 号 p. 260-263
発行日: 1993/02/01
公開日: 2009/11/19
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1993 年 47 巻 2 号 p. 264-271
発行日: 1993/02/01
公開日: 2009/11/19
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山田 卓良1993 年 47 巻 2 号 p. 272
発行日: 1993/02/01
公開日: 2009/11/19
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機械パルプの微生物処理に関する研究 (第6報)橘 燦郎, 足立 幸雄, 大久保 克美, 伊藤 和貴, 住本 昌之1993 年 47 巻 2 号 p. 273-284
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーReduction of acetophenone derivatives as a model compound for having α-carbonyl group was conducted to find out the effect of carbonyl groups, especially α-carbonyl group, in mechanical pulps on light-induced color reversion. The model compounds could not be almost reduced with potassium borohydride (KBH4) only, however, the reduction was effectively proceeded by addition of small amount of phase transfer catalyst (PTC). The methyl ether derivatives of acetophenones having no free phenolic hydroxyl group could be reduced with KBH4 accompanied with PTC to the corresponding alcohols in almost quantitative yields in a short time. On the contrary, in the case of the compounds having free phenolic hydroxyl group the reaction proceeded only about 20 to 30 % on the reduction. However, the carbonyl group could be reduced about 75 to 90 % when the phenolic hydroxyl group was blocked as acetate and followed by the reduction. In addition, the reduction products were further deacetylated during the reduction to the corresponding alcohols having free phenolic hydroxyl group.
Based on the results obtained from the model experiments, effect of reduction of carbonyl groups in mechanical pulps on light-induced color reversion was examined. Light-induced color reversion of groundwood pulp (GP), thermomechanical pulp (TMP), and pressurized groundwood pulp (PGW) could be depressed 33-44%, 11-19%, and 11-23%, respectively, to that of untreated pulps by pretreatment of unbleached mechanical pulps with KBH4 accompanied with PTC. And furthermore, the color reversion of GP, TMP, and PGW was also depressed 24-39%, 12-24%, and 10-26%, respectively, to that of untreated one when bleached mechanical pulps were treated with KBH4 accompanied with PTC.
The results showed that the effect of carbonyl groups in GP, TMP, and PGW on light-induced color reversion could be suggested about 30 %, 15 %, and 15 %, respectively. It has been said that carbonyl groups, especially, α-carbonyl group in mechanical pulps are greatly responsible for the color reversion. From the results obtained here, however, it is considered that carbonyl groups in mechanical pulps do not contribute so greatly to the color reversion, though α-carbonyl group functions as a photosensitizer on light-induced color reversion of mechanical pulps.抄録全体を表示PDF形式でダウンロード (1574K) -
佐野 嘉拓, 遠藤 健一, 遠藤 稔1993 年 47 巻 2 号 p. 285-295
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーThe preparation of kraft lignin-based wood adhesives with high tensile shear strength and water resistance was investigated. Softwood and hardwood kraft lignins (NKPL and LKPL) were isolated from industrial concentrated waste liquors in yields of 15.8% and 15.0% based on solids, respectively. A mixture of lignin and phenol (85 : 1570 : 30) was hydroxymethylated by reacting with formaldehyde in an alkaline aqueous methanol for 2 hours at 80°C. The reaction products. hydroxymethylated was named a lignin-phenol resin (LP). Walnut powder was added to LP for a lignin-based adhesive (LPA). LPAs produced from NKPL or LKPL containing over 20% of phenol had high dry tensile shear strength bonds when hot-pressed for 615 minutes at 140°C, but their wet strengths after 48-hour boil deteriorated strikingly. Alternative lignin-based adhesives (LPRA) which consisted of 8070% LP, 2030% resorcinol and so forth developed satisfactory bonds in either dry or wet strength when hot-pressed for 615 minutes at only 75100°C. All of 3-ply shinanoki plywoods bonded with LPRAs provided higher wood failure in the wet test than in the dry test. Ether soluble fractions (LP-2) from acidified LP contained hydroxymethylated phenols such as 2, 4, 6-trihydroxymethylphenol, so the resorcinol together with paraformaldehyde was found to be used as crosslinking agents between ether insolubles (LP-1) such as hydroxymethylated lignin-phenol copolymers and LP-2 to form water-insoluble macromolecule for adhesion. LPRA required less energy for bonding and yielded high-quality bonds, indicating that it may be useful as wood adhesives for various kinds of wood products.抄録全体を表示PDF形式でダウンロード (1581K) -
ウィスカーを主体とする段ボール箱防滑剤増田 隆志1993 年 47 巻 2 号 p. 296-302
発行日: 1993/02/01
公開日: 2009/11/19
ジャーナル フリーPDF形式でダウンロード (1078K)
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