JAPAN TAPPI JOURNAL

The State of the Art in Bleaching Technology (V)

Technology on Kraft Pulp Bleaching with Oxygen

Makoto Iwasaki

1984 Volume 38 Issue 12 Pages 1179-1195
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1179

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In this paper following articles are briefly reviewed.
1) Influence of process conditions on Oxygen bleaching.
2) Chemical reactions between Oxygen and lignin and cellulose.
3) Technology which prevent the decrease in pulp viscosity from Oxygen bleaching.
4) Technology of Oxidative Extraction and Medium Consistency Oxygen Delignification.

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Influence of SBR Latexes on Coated Paper Properties

Akira Uchida

1984 Volume 38 Issue 12 Pages 1196-1201
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1196

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The performance of coated paper is much influenced by SBR latexes which are used as a main binder of pigment coating.
In this paper, the following relationships between coated paper properties and characteristics of SBR latexes are discussed.
(1) Blister resistance and gel content of SBR
(2) Print gloss and particle size, ACN content, S/B ratio and gel content of SBR
(3) Gravure printability and Tg of SBR
And further a new type latex having heterogeneous SBR polymer phase, core-shell structure, in each individual particle is introduced compared with the conventional homogeneous SBR latex.

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Operational Experience on Deodorization of Malodourous Waste Liquor by Activated Sludge

Shunji Ohmori

1984 Volume 38 Issue 12 Pages 1202-1207
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1202

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In the conventional deodorization of kraft waste liquor, so-called physico-chemical processes, such as absorption, adsorption, incineration, etc., have been widely used.
We have developed a biological deodorization process making use of the mill's existing activated sludge process.
Based on present research achievement, Shirakawa Mill has modified the 8, 100m³ capacity activated sludge process and achieved successfully the deodorization at efficiency of 90% or higher.
In a kraft pulping mill which has already installed activated sludge process, deodorization can be accomplished by making use of present technology while maintaining fully the capability of the waste liquor treatment.

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Pulp and Paper Mills in Brasil

Belo Oriente Mill, Celulose Nipo-Brasileira S. A.

Japan Brasil Paper and Pulp, Resources Development Co. Ltd.

1984 Volume 38 Issue 12 Pages 1208-1216
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1208

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CENIBRA-CELULOSE NIPO-BRASILEIRA S. A.-was established in 1973 by a joint venture between Japan and Brasil. The company manufactures encalyptus bleached sulphate pulp and its mill is located in Belo Oriente of Minas Gerais, a mid-east state of Brasil.
The mill started its operation in 1977 and produces approximately 300, 000 A. D. ton per year of bleached sulphate pulp at present. About a half of its product is delivered to its Japanese share holders, and the other half is delivered to its customers, both foreign and domestic.

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Method for Determining the Receptivity of Paper and Paperboard to Printing Ink (K & N Ink)

1984 Volume 38 Issue 12 Pages 1225-1226
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1225

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Method for Measurement of Paper Thickness using Linear Variable Differential Transducer

Minoru Kimura, Shinya Matsui, Takashi Kadoya

1984 Volume 38 Issue 12 Pages 1227-1232
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1227

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Accurate determination of paper thickness and measurement of the variation profile of the thickness are among the detailed items of information on sheet geometry essential to the understanding of paper quality. Local density variation may also govern the load-elongation, behavior and printability of the sheet. To describe such kinds of sheet geometry requires measuring the thickness of a given spot in a sheet.
A thickness measurement device which uses a linear variable differential transducer (LVDT) has been assembled and tested. The LVDT was scanned by a spiral grooved rod connected to a stepping motor whose rotation speed could be controlled by a pulse generator.
The first step in this trial involved comparing the validity of the mean thickness obtained by this method with that determined by the mercury displacement method. Thicknesses determined by the two methods on more than 40 specimens tested were found to be very similar.
This device has the potential to obtain a thickness variation profile which will enable us to carry out frequency analysis of the profile and to obtain local sheet density variation. Details will be reported elsewhere.

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Dispersion and Coagulation of White Lauan Extractives

Part II. Adsorption on Pulp and Fillers

Sachio Takayama, Mitsugu Takahashi, Akio Okagawa

1984 Volume 38 Issue 12 Pages 1233-1240
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1233

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Adsorption behavior of white lauan pitch particles on pulp and fillers was investigated. Adsorption of pitch increased linearly with the equilibrium concentration of pitch particles in suspension, indicating that the adsorption isotherm was Langmuir type. Although NaCl or CaCl₂ addition had a minute effect on the pitch adsorption, AlCl₃ or Al₂ (SO₄)₃ exerted a distinctive effect showing the maximum adsorption to be present at the concentration near the equi-potential point of pitch particles. Similar behavior was observed with the addition of cationic polyelectrolytes. These results imply that the adsorption of pitch is controlled more seriously by the surface potential of pitch particles rather than that of pulp. The effect of fillers, such as talc and titanium dioxide was small compared to that of electrolytes.

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Study on Kraft Pulping Conditions by Simulation Method

Miyuki Kojima, Junzo Aoi, Hiroshi Tsuchiya, Takeo Nagasawa

1984 Volume 38 Issue 12 Pages 1241-1248
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1241

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This report concerns applications of cooking reaction rate equations developed from the data based on 3n typed orthogonal arrays to some cases of kraft pulping. First, the correlation of mill chip thickness with hand made chip thickness was determined by cooking experiments and the corresponding calculations. Second, the optimum cooking conditions were discussed to be expected increasing carbohydrate yield. In one case, taking the selectivity coefficient as a parameter, (CH.)-(T. L.), the best condition for each variable was proved. In another case, taking the ratio of decarbohydrate rate to delignification rate, VcH./VT. L., some interesting trends for cooking conditions were obtained. Two Temperature cooking and Injection cooking were verified as profitable methods in increasing carbohydrate yield. Third, it was pointed out that the deviation of chip thickness in mill chips must be the cause in decreasing carbohydrate yield.

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[title in Japanese]

1984 Volume 38 Issue 12 Pages 1249
Published: December 01, 1984
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.38.1249

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