JAPAN TAPPI JOURNAL

The Recent Coating Technologies in Coated Printing Paper (I)

Jujiro Kohno

1985 Volume 39 Issue 4 Pages 355-366
Published: April 01, 1985
Released on J-STAGE: November 16, 2009

DOIhttps://doi.org/10.2524/jtappij.39.355

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The recent coating technologies in coated printing papers are summarized mainly for a number of literatures published for past two years. The main subject of the present paper is to report the improvement in coater, the rheological properties of coating colors upon blade, the high solid coating and the development in latex.
The paper (I) describes a marketing trend of coated printing paper and a classification of many kinds of coater heads

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New Trends of Multilayer Materials for Various Fields, Mostly for Packaging Field

Toshio Iida

1985 Volume 39 Issue 4 Pages 367-374
Published: April 01, 1985
Released on J-STAGE: November 16, 2009

DOIhttps://doi.org/10.2524/jtappij.39.367

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This paper surveys multilayer materials on three sides, substrates, adhesive materials and processing technology, and refers to the market application and forcasts future trends.

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Bio-technology for Pulp and Paper Industry

[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...

1985 Volume 39 Issue 4 Pages 375-384
Published: April 01, 1985
Released on J-STAGE: April 23, 2010

DOIhttps://doi.org/10.2524/jtappij.39.375

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The Instrument of NOx Reduction for Pulverized Coal Boiler

Shizuo Misawa

1985 Volume 39 Issue 4 Pages 385-389
Published: April 01, 1985
Released on J-STAGE: November 16, 2009

DOIhttps://doi.org/10.2524/jtappij.39.385

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The Contents of this article may be summarized as follows.
1. Instruments of NOx reduction
(1) On adoption of pulverized coal burner for NOx reduction
(2) On adoption of the bias combustion
(3) On improvement of the wind box
(4) On change of the diameter of burner throat
2. Results of the combustion test and effects of NOx reduction

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Studies on Alkali-Oxygen Pulping Process (Part IV)

By the oxidative bleaching of rice straw pulpobtained by oxygen pulping process

Kunio Tosaka, Jisuke Hayashi

1985 Volume 39 Issue 4 Pages 391-398
Published: April 01, 1985
Released on J-STAGE: November 16, 2009

DOIhttps://doi.org/10.2524/jtappij.39.391

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For obtaining high brightness pulp, O₂, O₃ and H₂O₂ bleaching and subsequent ClO₂ bleaching have been carried out with two sorts of unbleaching pulp obtaind by alkali-oxygen pulp-ing process with pulping condition (I) and (II) from rice straw. And the effects of those bleaching was evaluated on the basis of brightness and paper strength of pulp obtained by oxidative bleaching and by subsequent ClO₂ bleaching.
(1) The both unbleached pulps were possible to obtain more higher brightness with O₃ bleaching, but paper strength, especially tear factor were decreased remakably.
(2) The unbleached pulp obtained with pulping condition (I) were increased generally 5 points of brightness with O₂ and H₂O₂ bleaching, but the unbleached pulp obtained with pulping condition (II) were not improved thier brightness with those bleaching.
(3) The bleached pulp of brightness over 80% were obtained from O₃ bleached pulp and commercial Cl₂ treated pulp with one stage bleaching. But paper strength of the former had showed remakable low value and it was necessitated to investigate appropriate protector for O₃ bleaching.
(4) For obtaining the bleached pulp over 80% brightness from pulp obtained with O₂ bleaching, two stage ClO₂ bleaching were required, but paper strength of obtained pulp were maintained same strength with original pulp. And the pulps obtained with H₂O₂ bleaching and subsequent two stage ClO₂ bleaching were not attained to brightness over 80%.

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Press-Drying of Softwood Bleached Pulp

Minoru Kimura, Kiyotaka Ninomiya, Takashi Kadoya

1985 Volume 39 Issue 4 Pages 399-406
Published: April 01, 1985
Released on J-STAGE: November 16, 2009

DOIhttps://doi.org/10.2524/jtappij.39.399

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Press drying is a technique where the wet sheet is simultaneously pressed and dried with z-directional restraint. Since fibrous materials, especially those from high yield pulps, become more pliable with press drying, improved strength properties of the sheet can be expected.
Bleached softwood kraft pulpsheet was press-dried in this study to evaluate the potential applicability of this method to the effective use of wood resources.
The results of the mechanical tests indicated that press drying was effective for bleached chemical pulpsheet as well as for high yield pulpsheet. This leads to the assumption that some mechanism other than lignin flow contributes to the superiority of mechanical properties of the press dried sheet. It is possible that the fibers become soft and compressible in the presence of heat and water even after lignin is removed from them. According to Scallan's model on the microstructure of pulp, shear deformation at an interfibrillar region takes place easily by external load when water penetrates the interlamella of the fibers.
A denser part at both sheet surfaces was assumed by the results of the bending test. However, more careful experiments focussing on the sheet structure are required to draw a clear conclusion on a z-directional uneven mass distribution.

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[title in Japanese]

1985 Volume 39 Issue 4 Pages 407
Published: April 01, 1985
Released on J-STAGE: November 16, 2009

DOIhttps://doi.org/10.2524/jtappij.39.407

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