JAPAN TAPPI JOURNAL

My Remembrance of Improvement for Paper Making

Itsuki Nishi

1973 Volume 27 Issue 12 Pages 563-564
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_563

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An Evaluation of Varios Synthetic Pulps

Masahiro Yamana

1973 Volume 27 Issue 12 Pages 565-570
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_565

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Application of Scanning Electron Microscope on Papers

Shigenobu Maki

1973 Volume 27 Issue 12 Pages 571-586
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_571

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This work was undertaken to study the application of the S.E.M. observation of papers, particularly specialty papers.
The S.E.M. provides the informations on the shape and form of pigments, the fibrillation of fibers, and the surface of synthetic papers, coated papers and specialty papers, etc..
By attaching the tension apparatus to S.E.M., the author have observed the behavior of coated layer during stretching of the specimens, and also have observed the stripping motion of fibers of the base papers.
The S.E.M. combined with energy dispersive X-ray analyser could be used for the qualitative or semiquantitative analysis of the pigment or filler distributions on the coated papers and fibers.

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Studies on Oxygen-Alkali Treatment of Ligneous Materials Part II

One Stage Oxygen-Alkali Cooking Of Asplund Pulp

Jun-ichro Kido, Kokki Sakai, Tamio Kondo

1973 Volume 27 Issue 12 Pages 587-594
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_587

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One stage oxygen-alkali cooking under relatively low pressure (610kg/cm²) was investigated using Asplund pulp of White Birch (Betula platyphylla SUKATCHEV var.japonica HARA) as a starting material.
Alkali charge, oxygen pressure, pulp to liquor ratio, and reaction temperature showed significant effects on the properties of pulp obtained.
It was found that addition of MgCO₃ as a protector in the cooking liquor inhibited the severe degradation of carbohydrates selectively, but didn't affect the delignification, resulting in remarkable improvement of the yield, brightness and strength properties of the pulp. Furthermore, dissolved organic materials, COD and color of spent liquor were reduced by addition of the protector. Optimum charge of MgCO₃ was found to be varied depending on the charge of cooking conditions.
Conclusively, optimum cooking conditions within the range tested require 30% alkali charge, 10kg/cm² oxygen pressure, 1 : 15 pulp to liquor ratio, 110 °C reaction temperature, and 2% addition of MgCO₃, respectively.
The pulp obtained by oxygen-alkali cooking (OP) contained more residual lignin but less pentosan than kraft pulp (KP) and alkali pulp (AP).
Strength properties of OP were not so good as those of KP, showing that one of the disadvantage of OP is it's inferiority to sheet strength.
The color and COD of OP spent liquor were only 1.5% and 35% of KP spent liquor respectively.Thus, by this process, it is expected to reduce the environmental pollution.

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Mechanism of Irreversible Adsorption of Cationic Polyelectrolytes onto Cellulosic Fibers and Its Application to Dyeing Process and Fungicide

Katsuo Akagane, G.G. Allan

1973 Volume 27 Issue 12 Pages 595-600
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_595

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It was revealed that the intimate relationship between molecular size of cationic polymer and porous diameter of absorbent existed with regard to adsorption-desorption of cationic polymer onto porous absorbent.
Polyelectrolyte can develop changes within the macromolecules when subjected to pH changes in their environments.If a sudden increase in the dimensions of the adsorbed polyelectrolytes occurs as the pH of their environment changes, some of the macromolecules within the adsorbents will become greater in size than their containing pore.Thus, they will be trapped within pore.This was clearly demonstrated with protein adsorption onto cellulosic materials, such as α-cellulose, cotton ball, glassine paper, microcrystal cellulose and beated pulp fiber. Moreover, the cationic polymer retained fiber remarkably increased dyeability and stability of direct dye. In addition to this, the fungicidal polymer which was synthesized by adducting pentachlorophenol to the side chains of polyethylenimine was irreversibly retained on the cellulosic fiber and the polymer treated fibers exhibited antifungus properties for a long period.

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OK Steam Stripping System

Shinichiro Kondo

1973 Volume 27 Issue 12 Pages 601-605
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_601

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Utilization of Synthetic Polymer in the Paper Industry. Part I

Yasushi Takahata

1973 Volume 27 Issue 12 Pages 606-612
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_606

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Some Examples of Recovery Boiler Furnace Explosions

I. Smelt-Water Explosion

Akio Isshiki

1973 Volume 27 Issue 12 Pages 613-615
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_613

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[title in Japanese]

1973 Volume 27 Issue 12 Pages Preface1
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_Preface1

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[title in Japanese]

1973 Volume 27 Issue 12 Pages Preface2-Preface3
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_Preface2

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[title in Japanese]

[in Japanese]

1973 Volume 27 Issue 12 Pages Preface4-Preface6
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_Preface4

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[title in Japanese]

1973 Volume 27 Issue 12 Pages Preface19-Preface20
Published: December 01, 1973
Released on J-STAGE: November 10, 2009

DOIhttps://doi.org/10.2524/jtappij.27.12_Preface19

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