巻号一覧
前身誌
15 巻, 2 号
選択された号の論文の10件中1～10を表示しています
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亀井 幹允1961 年 15 巻 2 号 p. 84-93
発行日: 1961/02/10
公開日: 2009/11/17
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石黒 久三郎1961 年 15 巻 2 号 p. 94-96
発行日: 1961/02/10
公開日: 2009/11/17
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田口 大1961 年 15 巻 2 号 p. 97-104
発行日: 1961/02/10
公開日: 2009/11/17
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畑 幸徳1961 年 15 巻 2 号 p. 105-108
発行日: 1961/02/10
公開日: 2009/11/17
ジャーナル フリー(Research Institute of Oji Paper Co., Ltd., Tokyo)
New pulping methods of hard wood have been studied eagerly in Japan, because soft wood has become scarce by overfelling.
Characteristics of hard wood pulp depend on the properties of the fiber, that is, short and slender shape and rich content of pentosan.
Blending the hard wood pulp in various papers, the printability of the papers are improved and such properties as formation, smoothness, opacities rise.
(1) Bleached kraft pulp of hard wood are used in fine paper, and owing to blending, the printability of the paper is improved considerably. But viscous printing ink sometimes takes away the vessels from paper surface during offset printing.
(2) Semichemical pulp and chemi-ground pulp are used in news print and photogravure paper.Properties of chemi-ground pulp are similar to ground wood of soft wood, but lower opacity.
(3) Ground wood of hard wood has high opacity, and is used in news print.抄録全体を表示PDF形式でダウンロード (945K) -
戸田 久昭, 木島 常明, 浜田 忠平1961 年 15 巻 2 号 p. 109-115
発行日: 1961/02/10
公開日: 2009/11/17
ジャーナル フリーBirch bleached sulphite pulps extracted with 1-5% sodium hydroxide solutions were beaten by Lampen mill or Tappi standard test beater. Beating rate and tensile or bursting strengths of the pulp at the equal freeness decrease with the amount of hemicelluloses extracted (Table 1, Fig. 1 and 2). The reason seems to be that water retention value of pulp beaten at the equal freeness and fiber bonded area in the dried sheet (shown as specific scattering coefficient) decrease with the amount of hemicelluloses extracted (Fig 3). However, the water retention value, especially specific scattering coefficient relates closely with tensile or bursting strengths of the sheet, irrespective of the amount of extracted hemicelluloses (Fig. 4 5 and 6).
The pulp beaten in aluminium sulphate solution is poor in beating rate and bursting strength compared with the pulp beaten in water. On the other hand, the uronic acid-rich pulp bleached with sodium chlorite (Table 2) is easier to swell by beating and higher in bursting strength at the equal freeness compared with the pulps bleached by a conventional 3 stages process (chlorination, caustic extraction, hypochlorite bleaching). In all these pulps, however, specific scattering coefficient relates with the tensile or bursting strengths (Fig. 7 and 8). Speciffic scattering coefficient relates also with air permeability (Fig. 9 and 10).
The tearing strength and the wet tensile strength of the pulps treated with sodium hydroxide solutions are higher than those of the original pulp at the equal specific scattering coefficient (Fig. 11 and 12) This result shows probably that the bonding strengths at the equal bonded area of these pulps are not invariably constant.
Sheet density does not relate with specific scattering coefficient in the case of pulps varied in hemicellulose contents (Fig. 13).抄録全体を表示PDF形式でダウンロード (1109K) -
町田 誠之, 錦織 禎徳1961 年 15 巻 2 号 p. 116-121
発行日: 1961/02/10
公開日: 2009/11/17
ジャーナル フリーUsinga queous solutions of polyethylene oxides of various degrees of polymerisation as dispersing agent, paper making by means of Japanese tradional hand-process was studied.
Concerningthe dispersibility, some properties of the solution of polyethylene oxide were also investigated.
Results obtained are summarized as follows.
1) Water soluble polyethylene oxide can be used as the dispersing agent in the paper making, and the dispersibility is generally proportional to degree of polymerization of the polymer. The paper making properties of the solution, however, differ from those of Tororo-aoi mucilage.
2) Block copolymer of propylene oxide and ethylene oxide has not the dispersibility, but the mixture of the block copolymer and polyethylene oxide indicates good dispersibility.
3) The dispersibility of polyethylene oxide is improved by adding sodium alginate or CNIC, but the paper making properties of the solution differ appreciably from those of Tororo-aoi mucilage.
4) Addition of phosphates has no influence upon the dispersibility of polyethylene oxide.
5) Paper made up by use of polyethylene oxide as the dispersing agent has somewhat worse texture but rather better toughness than that made up by using Tororo-aoi mucilage.
6) Viscosity and filterability of the solution of polyethylene oxide and sedimentation velocity of pulp fibers in the solution have not direct relation to the dispersibility of the solution.抄録全体を表示PDF形式でダウンロード (1099K) -
角 祐一郎1961 年 15 巻 2 号 p. 122-127
発行日: 1961/02/10
公開日: 2009/11/17
ジャーナル フリーThe hot alkaline refining of prechlorinated sulphite pulp was studied with the various concentrations of alkaline solutions. The results are as follows :
1) If an equal amount of sodium hydroxide based on moisture-free pulp is used in the treatments, higher refining effect is obtained with increase in pulp consistency.
2) The refining reaction scarcely goes on, when the concentration of sodium hydroxide solution is reduced to 0.05% or less on the course of hot alkaline treatment.
3) A certain correlation seems to exist between the yield and the alpha cellulose content of refined pulp, and the amount of dissolving from pulp is a function of the amount of alkali consumed in the treatment. Therefore, the highest alpha cellulose content of pulp, expected within a range of adopted conditions, may be determined by the amount of sodium hydroxide based on moisture-free pulp using in the hot alkaline refining.
4) The velocity of refining reaction during the hot alkaline treatment is influenced by the amount of remained pulp and the concentration of alkaline solution.
5) The higher the concentration of alkaline solution adopted, the quicker the reaction takes place, and the velocity does not reduce to the corresponding level, even if the alkali concentration falls down on the course of refining. This is due to the fact that the structure of cellulose fiber is loosened by the higher alkaline solution at the beginning of treatment.抄録全体を表示PDF形式でダウンロード (1059K) -
和紙の変質加藤 晴治, 小倉 京子1961 年 15 巻 2 号 p. 128-131
発行日: 1961/02/10
公開日: 2009/11/17
ジャーナル フリーI tried every microscopy accompanied by physical and chemical tests on the fibre of pure Kozo-paper for books manufactured during 1688-1868.
Comparing these with the up-to-date goods, I can conclude as follows :
(1) No external change is found by the lapse of years, but polymerisation of fibre is lessened, which enormously effects upon the strength of paper
(2) Astringency is considerably weakened.
(3) Bursting strength, tensile strength and extention are now remarkably feeb
(4) Folding endurance still remains almost unchanged.抄録全体を表示PDF形式でダウンロード (257K) -
市川 幸作1961 年 15 巻 2 号 p. 132-133,131a
発行日: 1961/02/10
公開日: 2009/11/17
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渡 長次郎1961 年 15 巻 2 号 p. 134-138
発行日: 1961/02/10
公開日: 2009/11/17
ジャーナル フリーPDF形式でダウンロード (981K)
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