JAPAN TAPPI JOURNAL

With best wishes to the Japanese Paper Industry

Tokue Iwatsu

1991 Volume 45 Issue 6 Pages 631-643
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.631

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On the basis of 38 year career with Jujo Paper Co., Ltd., three essential subjects-How to make the best of engineers ? Which way paper technology should go ? How to get the job done, easy, quick and right ? -are discussed. On the human side, emphasis is put on education, communication and empowerment. A boundaryless, pecking orderless and womanfriendly organization is touched upon. On the technical side, standardizing dimensions of paper machine rolls and clothes is suggested. Facing with engineer crunch, the author believes in advantages of the engineering firms specialized in mill construction, a new concept to the Japanese paper industry. In order to thrive and yet contribute to the world environment, the industrywide effort to develop fast growing fiber resources is most desired.

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The Babcock Hitachi Kraft Recovery Boiler

Shin Kawada, Hideo Ibuka

1991 Volume 45 Issue 6 Pages 644-655
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.644

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This paper describes on the design features of the Babcock Hitachi new generation, high pressure, high temperature kraft recovery boiler including the basic design concepts, constructional features, considerations in design for longer continuous operation, for minimum maintainability and for safety. Babcock Hitachi is now able to utilize all technical know-how from the Babcock & Wilcox Company, U. S. A.

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Printability Aids “Epinox P-593 and P-363”

Satoshi Takizawa, Hiroharu Kawano, Hiroki Ohwak

1991 Volume 45 Issue 6 Pages 656-663
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.656

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This paper reviews on printability aids which are added to pigment coating color for the improvement of printability.
The function and the mechanism are described and newly developed printability aids, “Epinox P-593 and P-363” are also introduced, which are superior to conventional printability aids.

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Production of PHB in activated sludge

Takashi Tomozawa, Yuji Saito

1991 Volume 45 Issue 6 Pages 664-670
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.664

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The experiments were carried out to produce PHB (Poly-β-Hydroxybutyrate) in activated sludge. The production of PHB under nitrogen limited condition was confirmed and CH₃COONa was better than glucose as carbon source for production of PHB. Content of PHB was stabilized to its maximum stage around 250 hours by continuous process and it was achieved to 12% of dried sludge weight basis. PHB was slowly accumulated and consumption than carbohydrate in batch process.

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Innovation of Warehousing System for Paper Roll Storage

Takeshi Ito

1991 Volume 45 Issue 6 Pages 671-676
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.671

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Mitsubishi Heavy Industries, Ltd. had developed the automatically-controlled warehousing system, which can achieve the easy handling of paper rolls with minimum workers in small space of the warehouse. This system consists of ;
(1) full-automatically controlled overhead cranes with the gripping device originally designed by MHI.
(2) infeed and/or discharge conveyor systems.
(3) computer system for inventory and location control.
Comparing with a conventional forklift handling system, the following advantages can be achieved.
(1) about two times amount of paper roll storage in the same stock area.
(2) reliable inventory control.
(3) quick discharge of paper rolls.
(4) labor cost saving by the minimum workers.
(5) space saving.
(6) clean atmosphere in the warehouse.
(7) safety operation.

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[title in Japanese]

[in Japanese]

1991 Volume 45 Issue 6 Pages 683
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.683

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Studies on Flow Properties of Coating Colors.

I Interfacial and Viscoelastic Properties of Binder Latices

Yong-Kyu Lee, Fumihiko Onabe, Makoto Usuda, Kazuhiro Sato

1991 Volume 45 Issue 6 Pages 685-693
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.685

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The viscoelastic properties of binder latices for paper coating were investigated, together with dynamic viscoelastic properties of latex films and electron micrographs of latices, under various conditions. The amphoteric latex, binder-pigment latex and anionic latex were used in this work. The amphoteric latex has both anionic and cationic functional groups on its surface. The binder-pigment latex with a core-shell structure has dual functions : plastic pigment and binder.
The low-shear and high-shear viscoelasticity of binder latices and clay slurry were measured with Brookfield viscometer and Hercules high-shear viscometer, respectively.
At low-shear rates, the viscosity decreased with increasing particle size of latex. However, at high-shear rates, the different results were observed.
On the amphoteric latex surface, the carboxyl groups are assumed to be fully dissociated over the region of pH 9-12, but the density of negative groups seems to increase because of the gradual decrease in the degree of dissociation of amino groups. Since the apparent particle size of latex increases with surface charge, the electroviscous effect, i. e. increase in viscosity by surface charge, can be observed. On the anionic latex surface, the charge density is assumed to be nearly constant above pH 8. However, below pH 8 the coagulation of particles could be observed probably because of the decrease in charge density.
The time-dependent phenomena could not be observed at low-shear rate. However at high-shear rate, thixotropic properties of flow, and the internal structural breakdown of flow could be observed from time-dependent phenomena.

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Measurement of the Z-direction profile of fiber orientation in paper by laser diffraction

Yuji Abe, Akira Sakamoto

1991 Volume 45 Issue 6 Pages 694-701
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.694

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A method for measuring the Z-direction profile of fiber orientation of paper in X-Y plane is described. The technique is based on Fraunhofer diffraction and sheet splitting method by adhesive tape peeling. Diffraction patterns were evaluated by calculation together with experiments of simulated fiber orientation distribution, where the diffraction patterns of zero order were used. The results from these analyses are in good agreement with fiber orientation distribution obtained from experiments. Furthermore the Z-direction profiles of fiber orientation of the papers made by Fourdrinier machine with shake and made by high speed machine are measured.

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[title in Japanese]

1991 Volume 45 Issue 6 Pages 702-707
Published: June 01, 1991
Released on J-STAGE: November 19, 2009

DOIhttps://doi.org/10.2524/jtappij.45.702

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