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Volume 50, Issue 7
Displaying 1-11 of 11 articles from this issue
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Toshiaki Kameda1996 Volume 50 Issue 7 Pages 967-991
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSPanel discussion titled “Tasks for Japanese Pulp Mill” was held by the seven members of Pulping Technology Committee, Japan Tappi.
In the discussion 1) pulping technology and environmental issues, 2) afforestation and import of foreign raw materials, 3) cost competitiveness, 4) technology for waste paper treatment, and 5) demand and supply trends of pulp, chip and energy were discussed.
And, as a conclusion, members proposed to pay more effort ; 1) to develop original technology especially for high yield pulping, 2) to strengthen the technology including higher quality to compete with Indonesian pulp mill with newest technology, 3) to participate in afforestation and also to develop the technology applicable to wider variation of wood resources, 4) to further introduction of non-chlorine bleaching and further reduction of fresh water consumption to be a minimum impact mill, 5) to announce more louder to the society regarding an environmental issue, and 6) to the product development considering the paper recycle.View full abstractDownload PDF (3690K) -
The Basic Biochemistry of Deposits and MicroorganismsKiyoyuki Egusa1996 Volume 50 Issue 7 Pages 992-1005
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSRecently, many paper mills are introducing the closed re-circulating systems because of increasing concerns over the improvement of production, regulation of wasted water, limitation of water source and saving of energy. Although this trend toward the closed system eliminates the above concerns, the various elements from the deposit are concentrated more in system, and accelerate the deposit problems in the paper making process.
Under these circumstances, the analysis of complicated deposit was highly achieved by the advancement of analysis equipment and treatment chemical for deposit control in the closed system has been developed.
We hereunder describe the basic technology and the current concerns of deposit control of paper making process.
In this paper, we report the basic biochemistry of deposits and micro-organisms in the paper making process and its countermeasure.View full abstractDownload PDF (1843K) -
A Topic of The Latest InstrumentationChuichi Honma1996 Volume 50 Issue 7 Pages 1006-1013
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThis paper describes a valve position controller with a microprocessor, using a mathematical control algorithm developed by Neles-Jamesbury.
Microprocessor-controlled operation provides better accuracy and speed of response when compared with traditional positioners, resulting in reduced process variability.
Furthermore, it has many features.
(1) Low air consumption reduces operational costs.
(2) Contact-free position feedback and spool valve do not depend on mechanical links which can be affected by vibration, etc.View full abstractDownload PDF (1785K) -
Peter D. Buikema1996 Volume 50 Issue 7 Pages 1014-1018
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSNow that Japan's economic downturn seems to be easing, and consumers are beginning to increase their use of paper, our industry will begin to grow at a faster rate once again.
Japanese papermakers will want to increase production to answer increasing demand, without suffering quality losses. Speeding up the machine often results in deposits, holes and sheet breaks, so the Japanese papermaker spends more cleanup time instead of making more paper.
Charge neutralization is becoming an increasingly popular way to overcome these difficulties. This article explains the concept as well as the measurement and control. The resultant benefits are seen in runnability, quality and profitability for the papermaker.View full abstractDownload PDF (944K) -
Technical Development of Electrical Insulating Paper for Extra High Voltage CableYuichiro Take1996 Volume 50 Issue 7 Pages 1019-1026
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESS(1) Improvement of Dielectric properties of Electrical Insulating Paper
First of all I started to improve the dielectric loss at high temperature caused by the ion conduction. Moreover, for the improvement at low temperature I continued research on the influence of hemi-cellulose or lignin. Finally I achieved to produce, by prehydrolysis, the pulp which contains less hemi-cellulose and established the paper making technology using that pulp.
(2) Technical Development of Electrical Insulating Paper for 154 kV Cable
Some mechanical properties of electrical insulating paper caused an unexpected trouble but the pulp made from Aomori-fir was helpful to solve this problem.
(3) Technical Development of Electrical Insulating Paper for 275 kV Cable
Using the less hemi-cellulose pulp as raw material and pure water, I established the technology of making the paper with low density and high impermeability.
(4) Technical Development of Electrical Insulating Paper for 500 kV1, 000 kV Cable
By proceeding research on the paper for 275 kV cable I succeeded to make the paper for 500 kV cable. For further needs, Semi-synthetic paper (PPLP) which is the composite of PP and paper, was developed by a joint investigation with Sumitomo Electric Co.. This paper is and will be useful for 500 kV1, 000 kV cable.View full abstractDownload PDF (1613K) -
[in Japanese]1996 Volume 50 Issue 7 Pages 1027
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (79K) -
Permanganate Bleaching under Neutral ConditionYasuo Kojima, Kiyoshi Miura, Minoru Terasawa, Hiroshi Okuyama, Tsutomu ...1996 Volume 50 Issue 7 Pages 1028-1035
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSTo prevent the severe degradation of cellulose during bleaching stage, permanganate bleaching have been carried out with hardwood kraft pulp under the neutral condition. The effect of neutral bleaching on chemical and physical properties of bleached pulps have been discussed comparing with the results from acidic bleaching.
Strength properties and brightness of bleached pulp under neutral condition were superior to those of pulp from acidic bleaching while there were no difference in viscosity and K value.
The bleachability of pulp after neutral bleaching with permanganate was evaluated by measurement of brightness after bleaching with ozone and/or chlorine dioxide. It was shown that the ozone bleaching of permanganate treated pulp have produced the higher brightness pulp.View full abstractDownload PDF (1452K) -
Hiroaki Inoue, Shinichi Inoue1996 Volume 50 Issue 7 Pages 1036-1041
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSMoisture distribution and compressive behavior of coated paper were studied by using stress-strain hysteresis on compression and decompression of coated paper.
As the moisture content was increased, the strain hysteresis of coated paper, which was the difference of strains between compression and decompression, was linearly increased. Similar result was obtained from base paper and moisture in coated layer less than in base paper layer, therefore the compression behavior and moisture content of coated paper were not affected by coated layer. Compression mainly took place on base paper.View full abstractDownload PDF (1079K) -
Tadahira Hamada, Tosihiro Miyahara, Hideichi Kawasaki1996 Volume 50 Issue 7 Pages 1042-1050
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSA new procedure to analyze the distribution of phenolic resin in paper base phenolic resin laminate by EPMA (Electron Probe Micro Analyzer) was studied on the specimen with osmium tetra oxide (OsO4) in the vapor phase.
It was found that phenolic resin in the laminate can be tagged with osmium by the treatment but paper is not tagged. Plateau values of Os-Mα intensity are reached by exposing specimen to the OsO4 vapor for 42 hours for prepregs (phenolic resin impregnated paper) and 72 hours for laminates. The distribution of flame retardant was analyzed, as well, by detecting bromine, which is contained in the flame retardant. In order to observe the cross section image of the laminate, specimen was exposed to the OsO4 vapor after being cut and sectioned.
In conclusion, the distribution of phenolic resin and flame retardant in the prepregs and the laminates could be clearly demonstrated by color mapping of Os and Br with WDS (Wave Length Dispersive Spectrometer). It was found that the distribution of phenolic resin in the prepreg varies depending on the structure of base paper. The WDS color map of the cross section of the laminates at higher magnification showed that the resin and the flame retardant exist in the intercellular voids and the lumina but not so much in the cell walls.View full abstractDownload PDF (1121K) -
1996 Volume 50 Issue 7 Pages 1051-1058
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (1243K) -
[in Japanese], [in Japanese]1996 Volume 50 Issue 7 Pages 1059-1063
Published: July 01, 1996
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (906K)
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