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Volume 34, Issue 1
Displaying 1-24 of 24 articles from this issue
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Toshiro Kawaguchi1980 Volume 34 Issue 1 Pages 1-2
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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[in Japanese]1980 Volume 34 Issue 1 Pages 3-7
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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Toshiro Kawaguchi1980 Volume 34 Issue 1 Pages 8-10
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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Toshiro Kawaguchi1980 Volume 34 Issue 1 Pages 11-14
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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Tsuneaki Kijima, Isao Yainakawa1980 Volume 34 Issue 1 Pages 17-23
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn this paper, we mensioned about the works on dimensional stability of paper we published before. They are summarized below.
1) Dimensional stability of paper had good relation to shrinkage of sheet during dring.
2) Shrinkage during drying was affected by morphological properties of fiber. Among of them, length of fiber and thickness of cell wall were significant. Papers made from the fibers of long length and with thick wall were rather stable in dimensional change.
3) Swelling force due to adsorption (or absorption) was very strong and was guessed to be higher than 1.500 kg/g of pulp in the case of density of 1.5. The swelling stress greatly correlated with the density of paper, therefore, dimensional stability of paper was largely affected by interfiber space.
4) The papers having differnt internal stresses were different in dimensional stability. By humidity cycling, papers dried without tension were not change in dimensions at each relative humidity of adsoaption or desorption process. However, in the case of papers dried under tension, dimensions decreased gradually by humidity cycling.View full abstractDownload PDF (628K) -
Kazuya Nishikawa, Yoichi Inoue, Yasuo Fujioka, Shonosuke Takahashi1980 Volume 34 Issue 1 Pages 24-30
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSRetention of paper stock ingredients in a vigorous draining process of sheet-forming was studied using a dynamic retention tester specifically designed to simulate a variety of commercial paper machines. Dynamic one-pass retention of filler and fines particles is substantially affected by morphological features of retaining pulp fibers, physical properties of particles of particles to be retained, the ratio of retaining fibers to particles, and the physico-chemical conditions involved in a papermaking system which are supposed to be aggravated by the accumulation of organic solutes and acid ions in circulating white water as the result of progressed closing of the system. The use of a synthetic polymer as a retention aid can be an effective measure to improve dynamic one-pass retention of fillers and fines provided that the polymer is of sufficiently high molecular weight and applied in a correct manner. ale-pass retention of soluble additives mostly depends on ionic conditions, and is closely related to the interfacial electrokinetic state of paper stock giving maximum retention at null zeta-potential on suspended particles.View full abstractDownload PDF (910K) -
Keisuke Yoshida1980 Volume 34 Issue 1 Pages 31-34
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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Noboru Shima1980 Volume 34 Issue 1 Pages 35-41
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe IP (Industrial Platform) system developed by IHI have made possible the speedy and economical construction of plants even in undeveloped areas of the world far from industrialized zones and lacking infrastructures.
This paper presents the application results of the IP system applied to the construction of a pulp plant.
The plant, having a designed production capacity of 750 t/d bleached kraft pulp, consists of a pulp manufacturing process plant and a power/chemical recovery plant, each of which was constructed in the configuration of a huge floating platform.
This unique IP system pulp plant was towed over 25, 000km by ocean and river routes on a three-month voyage from Japan to the plant site of the Amazon of Brazil where, after being grounded and installed permanently, it has been put into commercial operation for producing pulp for export.View full abstractDownload PDF (1471K) -
1980 Volume 34 Issue 1 Pages 42
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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[in Japanese]1980 Volume 34 Issue 1 Pages 43-44
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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Masahiro Yamana1980 Volume 34 Issue 1 Pages 45-49
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSGroundwood pulp was made from West Coast pine chips using a pocket type test grinder. Groundwood from chips (called FGP) has high content of Sommerville shives (about 30%), high content of fines (150 MP 67%), long drainage time, low tear factor (30), fairly high breaking length (2.4 km) and high scattering coefficient (800).
The strength development property of FGP fines is equivalent to that of GP fines. Printing properties of FGP are about the same as those of GP and better than those of refiner pulps.
Strength-, drainage-, and optical properties of a 25 : 75 mixture of FGP and high freeness (140 ml) TMP are equivalent to those of low freeness (90 ml) TMP, thus making the reduction of total refining energy possible.
The substitution of GP (11%) in newsprint furnish with FGP is apparently possible if TMP freeness is raised.View full abstractDownload PDF (407K) -
Yoshika Nomura1980 Volume 34 Issue 1 Pages 50-55
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSWe found in 1974 for the first time in the world that the addition of a little amount of anthraquinone, anthrahydroquinone or 1, 4-dihydro- 9, 10-dihydroxyanthracene (DDA, products of Diels Alder reaction of naphthoquinone and butadiene) to various pulping process including sulfate, soda and sulfite process is effective in improving the cooking yield, the cooking rate and the pulp quality. And then we moved to a mill application. Now in Japan, many mills have started DDA additive sulfate and neutral sulfite cooking with the objective of cooking yield increase and cooking chemical saving as well as pulp production increase.
In the sulfate process, by adding 0.02% DDA, we achieve the results of 1.5% cooking yield increase, and either the lowering of the cooking temperature by 5°C, the saving of 10% active alkali, or shortening the cooking time by 10 to 20%.
There are no differences in the effect of DDA among wood species and this cooking method does not require any change of production facility.
We have also thoroughly investigated the toxicity of DDA and confirmed the toxicity of DDA as negative.
Applying 0.05% DDA to soda process, cooking yield, cooking rate and pulp quality reach the level of the conventional sulfate process.
In the NSSC process, quinone additive works to promote uniformed softening of the chip and which in turn saves power consumption for refining decrease shive content and improves the bleachability and pulp quality.View full abstractDownload PDF (654K) -
A Computer SimulationR. P. Green, G. C. Smith1980 Volume 34 Issue 1 Pages 56-62
Published: January 01, 1980
Released on J-STAGE: April 23, 2010
JOURNAL FREE ACCESSChanges occur in white liquor composition when kraft white liquor is oxidized to produce sodium polysulfide and sodium hydroxide. The use of the oxidized white liquor in pulping increases the yield of pulp obtained, and lowers the organic content of the black liquor. The impact of these changs in liquor composition upon recovery operations is examined using computer analyses. Material and energy balances are given for various restraints on pulp production. The particular areas examined are the evaporator system, the recovery boiler, and the recausticizing system. It is shown that the benefits of increased yield can vary greatly depending upon the restraints on production, the cost of wood. and the cost of replacement fuel. While this paper deals specifically with polysulfide pretreatment, the conclusion that the benefits of increased yield are dependent upon specific pulp mill situations will apply to other means for incrasing yield.View full abstractDownload PDF (695K) -
Erich Kurz1980 Volume 34 Issue 1 Pages 63-74
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSHow “Carbon Copy Paper” and “Mixed Waste Paper” can be used for the flotation deinking process to regenerate secondary fibres in a high grade furnish for the paper industry.View full abstractDownload PDF (10262K) -
[in Japanese]1980 Volume 34 Issue 1 Pages 75-76
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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Toshiaki Tobe1980 Volume 34 Issue 1 Pages 77-81
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe No. 8 papermachine in Kushiro Mill is a Bel-Baie II having pulsation attenuator. The major MD variation is a periodic disturbance at 13.2 Hz ever since the machine operated. We tried to do various counterplans. After all, the screen was maked speed down, and a surge was diminished.View full abstractDownload PDF (428K) -
Kyoji Miki1980 Volume 34 Issue 1 Pages 82-90
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSVarious means have been tried and several kinds of twin-wire formers have been developed, in order to get over the two-sideness of paper, the biggest problem of fourdrinier paper machines.
However, since almost all the twin wire formers are designed so that the stock is put into two wires immediately after it is shot out of the headbox, here have appeared problems of different shorts, which are for instance, lower retention, rather many wire marks or pin holes and poor wed structure.
Valmet has overcome the two-sideness without subsequent problems after a thorough study by integrating all the qualities as paper.
It is the development of SYM-former, a unique twin-wire former.
Here we would like to introduce to you the outline of SYM former together with the headbox of Valmet.View full abstractDownload PDF (2611K) -
Masumi Ito1980 Volume 34 Issue 1 Pages 91-94
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSNo. 6 fine paper machine has been running successfully at Chuetsu Pulp Industry Co., Ltd. Nomachi mill, after starting up in October, 1978. This report describes the summary of operation for last 10 months.View full abstractDownload PDF (382K) -
Takeshi Wakamatsu1980 Volume 34 Issue 1 Pages 95-101
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe single top and bottom fabric system introduced on the paper machine in Japan two years ago. In this paper, the resultant effects and problems using this system are summarized as follows.
1) As the sheet flatter decreased, sheet running is stabilized and sheet breaking is remarkably decreased.
2) It is possible to reduce the sheet draw, then the width of sheet is widen somewhat.
3) Little effection on the moisture profile is recognized.
4) It has a little difficulty of sheed leading in the cylinder, but there is enough room for improvement.
5) It is effective to prevent the contaminating of the dryer cylinder and growing of sheet linting/dusting, and also to prevent the sheet damage by the scrubed dusts on the doctor blade.
6) Theoretically the drying efficiency becomes lower somewhat but practically it does not mean always a remarkable reduction as the compensating action is occured.
7) Sometimes breaking of the driving gears has happened on the special condition.
8) Dryer canvas (felt) using for the single system must be taken care of the following items.
Air permeability, flexibility, running stability, surface characteristics, thickness and seam.
All the above must be chosen to suitable drying conditions and sheet characteristics.View full abstractDownload PDF (768K) -
[in Japanese]1980 Volume 34 Issue 1 Pages 102-103
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
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Tadashi Izawa1980 Volume 34 Issue 1 Pages 104-108
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe BHK's Fuller Air Quenching Cooler is attached to the discharge end of the lime kiln and it is successfully operated.
The results were summerized as follow :
1) The calcined lime coaled from 1, 120 °C to 220 °C by air, the heat recuperation efficiency was 83 %.
2) Fuel consumption is decreased more than 15% (1/2 by cooler, 1/2 by another effect)
Add : Radiation loss from kiln shell is decreased about 1/3 4/4 by the use of some adiabatic concreate for refractory brick.View full abstractDownload PDF (689K) -
Hisashi Akiyama1980 Volume 34 Issue 1 Pages 109-117
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe need to reduce the dependence on oil as an industrial boiler fuel in Japan became quite obvious since the energy crisis of 1973.
Many industrial users of oil began looking toward coal as a fuel for existing and future steam generating equipment.
In this paper, the recent trends in design of coal fired boilers are described including the conversion to coal firing of existing oil fired boilers that were not originally designed for coal firing.View full abstractDownload PDF (3666K) -
Bunji Moriya1980 Volume 34 Issue 1 Pages 118-122
Published: January 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe Fluidized bed type incinerator has been installed in May 1978, for the purpose of incinerating paper sludge.
This equipment has a capacity of 288 t/d (wet), and it is the largest of its type in Japan.
An existing rotary kiln was reconstructed as a dryer to make effective use of its exhaust heat, and the use of fuel oil as a combustion aid was eliminated.
The incineration of paper sludge sludge was carried out so complete that the ignition loss of its ashes was diminished to below 0.8%.View full abstractDownload PDF (1320K) -
[in Japanese]1980 Volume 34 Issue 1 Pages 123-130
Published: January 01, 1980
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSLast spring, the energy committee of J. Tappi carried out the second survey on energy saving including the following three items.
1. The situation of energy saving activities in each company and/or mill.
2. The countermeasures for energy saving performed in the last few years and their effects.
3. The factors of increaing energy energy consumption encountered in the last few years.
More than 70 responses to the above questionnaire were collected from most of the representative mills in Japanese pulp and paper industry, and this paper presents the summary of the responses.
In addition, the prospect of energy demand and supply in the near future, activities of the energy committee and the recent frend of the legislation for energy conservation are also given as a general information in this area.View full abstractDownload PDF (1126K)
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