JAPAN TAPPI JOURNAL

Wetting in the Papermaking and Converting Processes (III)

Hiroshi Yamada

1986 Volume 40 Issue 5 Pages 419-433
Published: May 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.419

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In the third part of this series, following subjects are considered: wetting of base paper with impregnating resins, penetration of melt waxes into paper, adhesion of extruded polyethylene on paper, spreading and adhesion of toner in electrography, spreading and penetration of ink drops in ink jet printing and ink transfer in impact printing. Transfer and absorption of printing ink are also described with emphasis of penetration under pressure.

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Development of ACDEFLO BOX

Haruyoshi Fujiwara, Akira Eguchi, Toshimi Tajima, Norio Fujita, Takash ...

1986 Volume 40 Issue 5 Pages 434-438
Published: May 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.434

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Conventional headbox utilizes micro-turbulence to break up fiber floc and to disperse fiber. Fiber dispersixon, however, by strong turbulence has its limit by itself, because turbulence must be kept until fiber mat is formed in the former. So fiber dispersing method by oscillating movement in the flow is adopted in ACDEFLO BOX to get stable fiber dispersion. As a result better fiber dispersion is obtained even at higher consistency which difficult with conventional headbox.

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VISION 2002 NETWORK An Architecture for the Future

Santosh J. Nayak

1986 Volume 40 Issue 5 Pages 439-444
Published: May 01, 1986
Released on J-STAGE: November 29, 2010

DOIhttps://doi.org/10.2524/jtappij.40.439

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The VISION 2002 Network architecture provides the modularity and power required of distributed control systems. Given that a user's needs continually change the software oriented design delivers the flexibility to satisfy any situation. It is particulary suitable for plantwide applications because of the inherent global database and the ease of using it. Plant optimization, reporting, data logging and the linking of the process database with data processing applications are a natural extension to the processing needs. It does allow a user to start small-with a instrumentation or reporting system, and allows the system to grow to any size.

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New Applications of High Intensity Infrared to Reduce Binder Migration on Coating

Erik W. Stephansen

1986 Volume 40 Issue 5 Pages 445-451
Published: May 01, 1986
Released on J-STAGE: November 29, 2010

DOIhttps://doi.org/10.2524/jtappij.40.445

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Infrared radiation has been used for some time in coating applications to prevent picking, improve quality, and increase drying capacity.
A new high intensity, high frequency infrared system has been developed, now in use on paper machines and coaters. In some recent investigations with this high intensity, high frequency infrared source, we have found a region of operation where this system produces dramatic improvements in printability of the paper due to control of binder migration and associated mottling.
This paper will discuss the general subject of infrared radiation and coating, and then give detailed results of the application of this high intensity infrared radiation in reducing binder migration.

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Objective Evaluation Method of Print Quality (Part I) Instrumental Evaluating of the Print Quality in Solid Areas: Method and Application

Kazuya Nishikawa, Hiroshi Oshino, Hideaki Aoki, Mitsutoshi Saito, Ryos ...

1986 Volume 40 Issue 5 Pages 461-468
Published: May 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.461

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In order to establish the quantitative methods for evaluating print quality, affecting factors on print have been selected. In this paper, determination methods of print gloss, smoothness on print and print unevenness of solid areas have been examined in detail.
The results obtained are as follows:
(1) Print gloss: Specular gloss has been determined for different incident/receptor angles for three different papers, i.e., gloss type coated paper, wood-free paper and newsprint. It has been found that 46)/45° or 60°/60° specular gloss is appropriate for coated paper, while 75°/75° gloss is the best for wood-free paper and newsprint. By these evaluations; small difference in print gloss has been detected evidently.
(2) Smoothness on print: Center line average height (Ra) and surface length ratio (SL) have been obtained on print surface by use of the tracer methods. Average roughness curves have been evaluated in terms of Ra and SL. Wavelength and amptitude have been analyzed from waveform data by Fourier Transformation. Both methods have been shown to be effective to describe real changes in smoothness on print.
(3) Print unevenness: Print unevenness has been evaluated in terms of standard deviation of optical micro-density variation, which has been measured by use of the Microphotometer. The standard deviation has clearly demonstrated unevenness of printing surface in micro scale, and this agreed with visual observation result.

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Stadies on the Technology of Direct Causticizing Process by Ferric Oxide Part 1 Studies on Soda Quinone Pulping

1-Soda Quinone Pulping of Softwoods

Tokiya Yaguchi, Masahiro Sesaki, Toshio Taki, Michihiro Nakura

1986 Volume 40 Issue 5 Pages 469-476
Published: May 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.469

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Laboratory studies for direct causticizing process by ferric oxide in soda quinone pulping of softwoods (Douglas fir and pine (Akamatsu)) were carried out in comparison with kraft and borate kraft pulping. DDA (1, 4-dihydro-9, 10-dihydroxyanthracene sodium salt) was used as quinone with addition of 0.05-0.15% as AQ by weight on o.d. wood. Pulp yield and Kappa number were determined, and the quinone addition of 0.1% in soda quinone pulping increased the delignification rate to equal that of kraft and borate pulping at the sulfidity of 25% without reducing pulp yield. Bleachability of soda quinone pulp was slightly lower than that of kraft and borate kraft pulp, and the viscosity of bleached soda quinone pulp was 7-9 cp lower than that of kraft pulp. The pulp properties of soda quinone pulp were nearly equal to that of kraft and borate kraft pulp except tear strength of low Kappa number Douglas fir pulp and burst and tensile strength of pine pulp.

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Liquid Phase Ozone Bleaching of Kraft Pulp

Toshiro Fujii, Hiroshi Kamishima, Isao Akamatsu

1986 Volume 40 Issue 5 Pages 477-482
Published: May 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.477

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For the purpose of development of bleaching method which uses oxygen-containing bleaching agents, ozone bleaching of kraft pulps in the liquid phase has been investigated.
In comparison to gas phase ozone bleaching, liquid phase bleaching increased the yields of bleached pulp and prevented the drop of pulp viscosity, but needed the longer bleaching time.
Addition of an inorganic acid, such as sulfuric acid, to the bleaching system could not improve the pulp quality, but gave the shorter bleaching time. Oxalic acid (more than 0.07%) was found to be an effective additive that improved the viscosity and the bleaching velocity.

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[title in Japanese]

1986 Volume 40 Issue 5 Pages 483
Published: May 01, 1986
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2524/jtappij.40.483

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