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Volume 40, Issue 11
Displaying 1-10 of 10 articles from this issue
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Masakazu Morimoto1986 Volume 40 Issue 11 Pages 995-1001
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn this paper, some recent trends of the pulp and paper testing in Japan are reviewed in relation to the activities of the Testing Standards Committee of the J. TAPPI.View full abstractDownload PDF (1605K) -
Takeshi Hori1986 Volume 40 Issue 11 Pages 1002-1010
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSToray Waterless Plate was introduced for domestic market in November, 1979, and for overseas market in May, 1980. In the initial period, its applications were limited to specialty uses such as high quality art reproductions, dye-based ink printing, gold and silver ink printing, etc., due to some drawbacks in both the plate and the inks specially made for it. Since then, through several series of improvements, these drawbacks have been solved. And it is making rapid inroads into general commercial printing and other various fields of printing.
This paper describes its principles, properties, advantages and applications after briefly discussing the history of development of waterless planographic printing plate technology.View full abstractDownload PDF (2523K) -
Hisashi Hiraishi, Tohru Kawai, Shigeru Kitagawa1986 Volume 40 Issue 11 Pages 1011-1015
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn the paper making industry, higher speed process is required for improvement of the productivity. This means the requirement of more exellent suction roll shells with higher resistance to corrosion fatigue strength and more elongated survice life.
From point of view mensioned above, an introduce of non-destructive inspection on suction roll shells is strongly expected for conformation of the continuous operation.
We have developed a new device by using eddy current testing method for monitoring suction roll shells.
This paper is summarized as follows.
1) Principle of this method and outlines of the device
2) Characteristics of the method and measuring procedure
3) Examples of application
4) Recommendation
a) Inspection of cracks at initial stage on drill-hole surface and vicinity of the hole inside suction roll shells is applicable with every certain intervals by this device.
b) Monitoring of crack propergation in the works.View full abstractDownload PDF (1018K) -
A dual wet end chemistry systemHans Larsson1986 Volume 40 Issue 11 Pages 1016-1020
Published: November 01, 1986
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSDownload PDF (726K) -
Hideo Gotoh1986 Volume 40 Issue 11 Pages 1021-1028
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (3765K) -
1986 Volume 40 Issue 11 Pages 1031-1032
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (336K) -
-4-Unbleached Pulp Viscosity and Fiber Length of Soda Quinone PulpTokiya Yaguchi, Katsuhiro Oda, Hiroyuki Tadokoro, Michihiro Nakura1986 Volume 40 Issue 11 Pages 1033-1040
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSLaboratory studies for direct causticizing process by ferric oxide in unbleached pulp viscosity and weight average fiber length of soda quinone pulp were carried out in comparison with kraft pulp. DDA (1, 4-dihydro-9, 10-dihydroxy anthracene sodium salt) was used as quinone, and Kajaani FS-100 was used to measure fiber length distribution and average fiber length. Unbleached pulp viscosity of soda quinone pulp of Douglas fir (pin chips) decreased to half with 10°C rise of cooking temperature, to 2/3 with two times longer cooking time, and to half with 50% increase of active alkali charge. Nevertheless, there was no change on unbleached pulp viscosity with increase of quinone addition. Unbleached pulp viscosity increased straight with increase of sulfidity of KP. 0.1% quinone addition of soda quinone pulp was equal to 12.2% sulfidity of KP on the view point of unbleached pulp viscosity.2% quinone addition soda quinone pulp and 25% sulfidity of KP had longer fiber distribution than soda pulp and 0.1%soda quinone pulp. Unbleached pulp viscosity of Douglas fir increased slightly with increase of weight average fibe length, and tear factor of unbleached pulp at CSF 500ml increased with weight average fiber length.View full abstractDownload PDF (1200K) -
Computer Simulation of Recycled Bleachery Effluent ReuseTakao Matsushita, Nobutake Sasaki, Takeo Nagasawa1986 Volume 40 Issue 11 Pages 1041-1048
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSOptimized flow and economic feasibility of effluent recovery were estimated with steady state simulation model. Model system consists of brownstock washer and three bleaching stages and contains only material balance calculations. Optimization of recovery flow was evaluated with comparison of chemical consumption in bleach plant and evaporation load in chemical recovery process. Total costs were changed by how to reuse bleachery effluents and how to use fresh water in the process. Simulation results showed that favorable flow of bleachery effluent recovery was the flow that doesn't increase evaporation load, in other words, filtrates should be reused as much as possible in other parts of chemical recovery process. This is because energy cost exceeds chemical cost at present. Increase of washing stages also improved the washing efficiency and resulted in saving of recovery cost.View full abstractDownload PDF (1337K) -
Vessel Separation with Centri-CleanerShun-ichiro Mukoyoshi, Toshinori Ohtake, Junji Ohsawa1986 Volume 40 Issue 11 Pages 1049-1057
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSExperimental study with Centri-Cleaner to separate vessel elements from wood fibers was carried out using several bleached kraft pulps produced from some tropical and other hardwoods. Vessel separation efficiencies of pulp were examined in detail.
It became clear firstly that vessel elements having larger projected area and lower L/D ratio (ratio of longer side length (L) to shorter one (D) of projected vessel element) were separated more effectively into reject side of hydrocyclone.
Secondly, separation efficiency varied with pulp species. It was considered that one of the main reasons was the differences of shape (L/D) and size (projected area) of vessel elements. The pulp containing many slender (high L/D ratio) vessel elements had low separation efficiency.
Furthermore, the separation efficiency decreased with an increase in pulp consistency for Centri-Cleaner treatment. This is probably due to the development of fiber network in a Centri-Cleaner at high pulp consistency, which would hinder the settling of vessel elements.View full abstractDownload PDF (1836K) -
The influence of different fillers on cross-sectional structure of paperToru Katsura, Koji Murakami1986 Volume 40 Issue 11 Pages 1058-1064
Published: November 01, 1986
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSFiller distribution was evaluated for cross sections of different filler loaded papers. The fillers used in this investigation were talc, clay, ground calcium carbonate andtwo types of precipitated calcium carbonate (calcite and alagonite). The results are summarized as follows.
(1) The specific gravity and refractive index of the fillers used in this study are similar to each other, so the major differences among these fillers seem to be only in their size, shape and zeta potential.
(2) For all filler loaded papers except those loaded with clay, it is clear that the z-directional count and width of filler aggregates increases as the filler particle size dicreases. A good correlation between z-directional count and width was obtained, regardless of filler type, but the correlation for clay loaded papers differs from that obtained for the other fillers.
(3) The area fraction of filler aggregates tends to increase as filler particle size decreases. Inspection of different filler loaded papers by a scanning electron microscope or mercury intrusion technique showed that the change in area fraction with filler type may be attributed to a change in void volume of filler aggregates.View full abstractDownload PDF (2381K)
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