JAPAN TAPPI JOURNAL

Survey on recent papermaking technology

Interview with Dr. Goring of Toronto Univ. and Dr. Torza of Beloit

J.TAPPI Editorial Committee

1987 Volume 41 Issue 12 Pages 1171-1182
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1171

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Recent Development in Papermaking (I)

Kyuzabro Ishigro

1987 Volume 41 Issue 12 Pages 1183-1188
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1183

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Manufacture of Multilayer Printing Paper

Michio Kitamura

1987 Volume 41 Issue 12 Pages 1189-1195
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1189

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Report of The International Seminar on Lignin Enzymic and Microbial Degradatin

Masahiro Samejima

1987 Volume 41 Issue 12 Pages 1196-1203
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1196

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1986 Research Projects of Universities and Government Research Institutes

Wood Science Committee

1987 Volume 41 Issue 12 Pages 1204-1210
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1204

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[title in Japanese]

1987 Volume 41 Issue 12 Pages 1211-1212
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1211

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Application of the Image Processing Technique for Analysis on Sheet Structure of Paper IV.

Comparison with Visual Evalution of Formation

Takashi Yuhara, Makio Hasuike, Koji Murakami

1987 Volume 41 Issue 12 Pages 1213-1220
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1213

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The relationship between the visual evaluation of formation and the textural features of light transmitted images of sample sheets is discussed using 5 kinds of newsprint papers.
The two rank correlation coefficients associated with the relationship between the visual evaluation of floc and the textural feature f_e from the co-occurrence matrices were determined te be 1.0 (The matrices were calculated with images which were digitized with 1600μm and 3200μm detection spots).
The four rank correlation coefficients associated with the relationship between the visual evaluation of wire mark and the textural features f_i and f_i′ from the wevelength spectrum were determined to be 0.90 (The value of f_i was extrected from the wavelength range 200-3000μm, and the values of f_i′ were extracted from the wavelength ranges 200-2000μm, 200-3000μm, 200-4000um).
Thus, there is strong evidence that these two image analysis technique (i. e. the co-occurrence matrix and the wavelength spectra) may be correlated with the visual evaluation of floc and wire mark, respectively.

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Studies on the Technology of Direct Causticizing Process by Ferric Oxide Part 2 Properties of White Liquor and Black Liquor in Alkaline Pulping

4- Behavior of inorganic impurities in white liquor

Haruo Tsukamoto, Taizou Fujioka, Michihiro Nakura

1987 Volume 41 Issue 12 Pages 1221-1228
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1221

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Properties of white liquor in Direct Causticizing process by ferric oxide and behavior of inorganic impurities which were leached from iron ore and accumulated in white liquor were investigated.
Iron ore was reused 20 times in Direct Causticizing reaction and residual inorganic impurities were measured. About 66% of Al₂O₃ and only 5% of SiO₂ is leached at the first cycle. NaCl, Na₂SO₄, KCl and K₂CO₃ has very little influence on Direct Causticizing reaction between Fe₂O₃ and Na₂CO₃.

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The Computer Simulation on a Web Shrinkage in a Paper Machine Dryer Section

Part I Elastic Modulus and Drying Force as a Function of a Web Moisture

Kiyoaki Ioda

1987 Volume 41 Issue 12 Pages 1229-1234
Published: December 01, 1987
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.41.1229

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When a wet web dries up in a paper machine dryer section, it shrinks depending on drying conditions. When the shrinkage during drying is larger, the dried web has a tendency to make a more elongation and be less stable when subjected to humid conditions.
The auther has demonstrated in the series of previous papers that there will be a farirly large moisture variation in the cross direction during drying, even when its final moisture profile is rather uniform. This result will suggest that the moisture variation profile in a cross direction during drying, may end up in the variation of shrinkage in a cross direction of the dried web, which may cause an uneven behavior in a cross direction under humid conditions.
In order to investgate this hypothesis, the finite element method will be a good tool. This method, however, requres two physical properties, elastic modulus and stress, which in this case is force generated by drying. Moreover, these two properties vary as a wet web becomes dry.
So, in the Part I of the series, these two properties are measured as functions of a web moisture, using a multi-purpose tensile tester with a procedur edeveloped for this measurement.
W: moisture content g·water/g·fiber
F: drying force kg/(0.1g·water/g·fiber)·mm²E: elastic modulus kg/mm²F=4×10^(-4.43×W) (W≥0.07)
F=0.5×10^(9.2×W) (W≤0.07)
E=11×W^-0.740
These data are obtained under the small stress of 0.03kg/15mm.
In the coming report, the web shrinkage variation profile in a cross direction will be discussed by the finite element method using above data.

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