紙パ技協誌
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
39 巻, 12 号
選択された号の論文の8件中1~8を表示しています
  • 北村 迪夫
    1985 年 39 巻 12 号 p. 1101-1118
    発行日: 1985/12/01
    公開日: 2010/02/09
    ジャーナル フリー
  • 臼田 誠人
    1985 年 39 巻 12 号 p. 1119-1123
    発行日: 1985/12/01
    公開日: 2009/11/16
    ジャーナル フリー
    From the time of invention of paper, it has been thought that paper would last very long if the condition of its preservation was kept good. Many pieces of archives of the registry of Japanese provinces are preserved in the Treasure House of Royal Domestic Ministry of Japan, Shoso-in, from 8th century. Paper has been proved to be an excellent recording medium and be durable for many hundred years. However, William James Barrow pointed out about 30 years ago that paper, especially modern machine-made paper produced only 50 years ago caused deterioration. On the basis of his suggestion, studies on the deterioration of paper started in the United States 30 years ago. It was concluded that the principal cause of deterioration of paper is the acid hydrolysis of carbohydrates that is induced by the hydrolysis of alum indispensable to modern paper making.
    For longevity of book, many deacidification proceses were tried. Two of them are in practice, the one is diethyl zinc method that is used in the United States Congress Library and the other is methyl magnesium carbonate method in Canadian National Library. The latter is commercially available as Wei T'o method. Superiority of the method is now under discussion.
    In Japan, committee of protection of book against acid deterioration was organized in National Diet Library in 1982 and quality of book in the Library was surveyed at first. The degree of deterioration of books and journals increased with the age except the era of appearance of wood fiber-based paper, 1850-1880. This tendency was the same as that of California State University Library. The effect of deacidification treatment was tested using Wei T'o method. After 4 weeks ageing, methyl magnesium carbonate was sprayed on the aged samples. Spraying decreased markedly the rate of ageing of paper.
  • 鍛造製ステンレス鋼の材質特性
    高橋 博彦, 瀬尾 省逸
    1985 年 39 巻 12 号 p. 1124-1130
    発行日: 1985/12/01
    公開日: 2009/11/16
    ジャーナル フリー
    Suction roll receives the maximum shear stress at the center of inside surface. This stress causes fatigue cracking at material defects, even if the defects are every small. Many of the breakage trouble of the suction rolls has depend on the casting defects. Therefore, if the material were free from the defects, then the breakage should not have occured. Pitting corrosion was found out only at the casting defects.
    The suction roll shell made by one piece forging has no casting defects, so it is possible to design the new suction roll by using a new factor. Forged material is sound and homogeneous, then labo-datas are applicable for design without extra safety parameters.
  • 木材科学委員会
    1985 年 39 巻 12 号 p. 1143-1148
    発行日: 1985/12/01
    公開日: 2009/11/16
    ジャーナル フリー
    木材科学委員会では昨年に引き続き, 昭和59年変における大学・官公庁研究機関の研究題目及び費目の調査を行いましたので, 以下に御紹介致します。
  • 1985 年 39 巻 12 号 p. 1150
    発行日: 1985/12/01
    公開日: 2009/11/16
    ジャーナル フリー
  • 広瀬 重雄, 春日 和行, 畠山 兵衛
    1985 年 39 巻 12 号 p. 1151-1156
    発行日: 1985/12/01
    公開日: 2009/11/16
    ジャーナル フリー
    Alkali-oxygen (AO) degradation of lignin catalyzed by Co (III) was investigated in order to obtain phenols from lignin.
    The effect of degradation temperature was studied using red pine as a lignin sample. It was found that the main products were vanilline, acetoguaiacone and vanillic acid, and that the total yield of these phenols showed a maximum value, 18.2% at around 150°C, where the selectivity ratio of vanilline among these phenols was also highest.
    The above optimum condition was applied to the degradation of the dust part of coconut (Cocos nucifera) husks produced abundantly in tropical and subtropical countries. Eight phenols having 4-hydroxyphenyl, guaiacyl and syringyl structure were obtained in about 12% of yield. This result indicates that the AO-Co (III) system is also effective for the degradation of monocotyledon lignin. These phenols could be separated by a liquid chromatograph combined with solvent extraction. This suggests the possibility that phenols can be separated by a large scale liquid chromatograph.
  • 岡山 隆之, 木村 重昭, 大江 礼三郎
    1985 年 39 巻 12 号 p. 1157-1163
    発行日: 1985/12/01
    公開日: 2009/11/16
    ジャーナル フリー
    Wettability of paper surface is fundamentally important in determining penetration and/or absorption of water into the paper, for instance, as in the case of a ink jet printer.
    Therefore, contact angle of a water drop on paper surface with lapse of time was dynamically measured by means of a system consisting of an automatic syringe, an automatic rewinding camera, a stroboscope with a signal controller and a photo pick-up with a laser oscillator. The contact margin and profile of the drop was continuously photographed in every 10 ms.
    Contact angle of a water drop on wood-free papers decreased with time during the initial 30 ins and then fluctuated periodically at a certain level. On the other hand, ink jet papers showed significantly sharp decrease in contact angle and no fluctuation. Influences of some paper-making factors, such as grade of pulp, degree of beating and wet pressing, degree of sizing and others, on the dynamic behaviour of contact angle were investigated.
  • 亜麻パルプ, 木材パルプおよび両者を配合した巻紙の熱分解による揮発性生成物
    山崎 晃, 前田 和生
    1985 年 39 巻 12 号 p. 1164-1172
    発行日: 1985/12/01
    公開日: 2009/11/16
    ジャーナル フリー
    Volatile compounds produced by pyrolysis of flax pulp, wood pulp and handmade cigarette papers from both pulps in helium atmosphere at 650°C were investigated by pyrolysis gas chromatogrphic analysis. It was observed that there are some differences in amount of products from pyrolyzates of flax pulp, wood pulp and handmade cigarette paper. Furfurylformate (No. 54), which had never been reported as the pyrolysis product of cellulose, was newly identified from flax pyrolyzates.
    In the case of flax pulp, the pyrolysis in air atmosphere was studied over the rage of 350°C-650°C. The optimum temperature of pyrolysis for maximum production of volatile compounds in number and yield in air was 400°C.
    The cellulose cigarette smoke is similar to the pyrolyzate in helium atmosphere in the ratio of volatile compounds. This shows that flavor and taste of cigarette paper smoke could be evaluated based on the pyrozate in helium.
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