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Volume 55, Issue 4
Displaying 1-16 of 16 articles from this issue
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Kiyoaki Iida2001 Volume 55 Issue 4 Pages 417-427,019
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe Japanese paper industry is the second largest producer in the world, and is one of significant industries in the Japanese economy. As it has been less favorable than its competitors in the world in fundamentals such as wood and energy supply, the fact that it is No.2 is a result of its challenging efforts for solving problems in many sectors such as capital, raw materials, technology and environment. This paper introduces some of those technological efforts, which will hopefully stimulate young and fresh newcomers in the industry.View full abstractDownload PDF (3738K) -
Masahiro Sugihara, Kenji Yamada, Hiroshi Miura, Toshiaki Miyakura2001 Volume 55 Issue 4 Pages 428-434,019
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSMitsubishi Pilot Coater has been rebuilt to improve highspeed coating performance. This rebuild enables our high-speed coating technology developments, fundamental studies on high-speed coating phenomena. and customer's highspeed coating trials which verify the performance of coater or coating color composition.
The state of the art “Ejector & Steam substitution System” for high-speed free jet type applicator, which prevents the air entrainment at the interface between coating color jet and base paper surface, has been developed by using this high-speed pilot coater. Fundamental studies on film splitting and misting phenomena are also carrying out to realize the high-speed film coater.
In this report, we present our new high-speed pilot coater and some new technologies for highspeed coating.View full abstractDownload PDF (3262K) -
Hiroaki Tagashira2001 Volume 55 Issue 4 Pages 435-445,019
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe production of coated fine paper has, until now, mainly been based on separate processes. where base paper coating and calendering were off-line processes. A change has taken place in woodcontaining grades, all-on-line processes are already in production. The benefits are clear. Investment costs are significantly smaller than before, as well as running costs. The total efficiency of the paper making line can also be improved. despite the fact that it is more challenging to maintain time efficiency in an on-line process. Through long and thorough study, we can now present a new member of Opti-Concept family: a high speed OptiConcept line for coated woodfree paper.View full abstractDownload PDF (6158K) -
Koichi Motegi2001 Volume 55 Issue 4 Pages 446-450,020
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSSince the beginning of the eighties, anaerobic effluent treatment plants have been applied in the paper industry. The UASB reactor has become the most popular reactor. It is operating on almost all types of paper industry effluents, but the largest numbers can be found in the paper recycling industry.
When acid paper sizing was abandoned, circumstances for fresh water reduction improved considerably. so that process waters and resulting effluents became more concentrated in COD.
Besides this, anaerobic plants have also become popular for the treatment of condensates from sulphite (SP) and sulphate (Kraft) mills as well as for TMP and CTMP effluents and even for black liquor from soda pulping and NSSC. Improvements to the conventional UASB reactor have further increased loading rates and reduced hydraulic retention times. The IC (Internal Circulation) UASB reactor can treat twice the COD loading of conventional UASB at hydraulic retention times of 2 hours or more and is replacing the role of UASB in the paper industry effluents.View full abstractDownload PDF (1899K) -
Kazuo Kubota, Atsushi Hiraisi, Yoshihito Hamada, Toshiyuki Nishimori, ...2001 Volume 55 Issue 4 Pages 451-455,020
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSLighter weight papers with the better optical and printing characteristics are obtained by using a noble “bulking promoter” which has recently been introduced to the market. The “bulking promoter” was added during the preparation process and made the pulp hydrophobic. The surface modification of the pulp by the “bulking promoter” made the obtained paper sheet more porous and bulky. The scattering coefficient of the paper reasonably increased because of its high porosity, sothat the brightness and opacity of the paper would also be higher. The air permeability and smoothness of the obtained paper improved concurrently.
The “bulking promoter” has various possibilities for the paper production and has been gradually accepted in the market.View full abstractDownload PDF (2279K) -
Kenji Tsunekawa, Shuichi Arai, Kaori Sugasaki2001 Volume 55 Issue 4 Pages 456-465,021
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe importance of good understanding for rheological behavior of coating colors is increasing more and more in connection with the runnability in paper-coating processes in order to accomplish further increased coating speed and improvement of the productivity of the process. We reported earlier of our finding that the coating runnability was deeply correlated to the viscoelastic behavior of the coating color or, in particular, the elastic force acting therein. Further, the “solidity” of the coating color under the blade was discussed in terms of the viscoelasticity resulting in another report of which the subject matter was that “a coating color having a high elasitic force still retains a good flowability”. These considerations have led to a finding that, in order to accomplish an improvement in the coating runnability, studies are essential not only on the water retention and viscoelastic behavior of the coating color but also, in conjunction therewith, on the permeation behavior of the coating color to the base paper and the stability of pigment particles in the coating color.
This report is for our finding from the standpoint of coating runnability that rheology modifier have an advantageous effect not only on the water retention and viscoelasticity of coating color but also on the permeation behavior of the coating color to the base paper and stability of pigment particles in the coating color under storage.View full abstractDownload PDF (5182K) -
Makoto Endo2001 Volume 55 Issue 4 Pages 466-471,021
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSSince 1965, OMRON web inspection system improved year by year according to the requirement of the market and excellent technologies. The remarkable improvements are as follow.
Fault image can be seen just after it is detected and the image is memorized. Fault Image System makes easy to control quality of production process. By using color camera, many of faults that used to impossible to be detected. can be detected now.
The kind of fault can be recognized automatically by using precise image of fault. Fault recognition system will be completed near future. Web Inspection System will improve more and more rapidly, led by market requirements.View full abstractDownload PDF (3721K) -
Hideaki Matsukura2001 Volume 55 Issue 4 Pages 472-478,022
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSNow, I am plwased to be given a golden opportunity to introduce our up-to-date idea of soft pressure type Kneading & Dispersiing machin, “NEW TAIZEN”, that premits to treat wastepapers having Agreat difficulty to disintegrate, and Toproduce Aquality wastepaper pulp quite efficiently and more economically as well as environment friendly ways.View full abstractDownload PDF (2873K) -
A Step by Step ApproachJean-Christophe Hostachy, Jerome Cudelou, Pierre Larnicol2001 Volume 55 Issue 4 Pages 479-483,022
Published: April 01, 2001
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSToday. the Japanese Pulp and Paper Industry is facing more stringent regulations on chloroform emission. Therefore. most of the pulp mills are looking for a way of decreasing chloroform emission formed during their conventional pulp bleaching. It is well known that chloroform is mainly generated during the hypochlorite stage. With this background. it was decided, in this first part, to modify the existing bleaching sequence O C/D Ep H D used in a Japanese pulp mill to eliminate the H stage. The second part deals with the total replacement of Cl2 by ClO2 in order to prepare the Japanese pulp mills to the ECF bleaching considered in many other countries as the Best Available Technology (BAT). Finally the last optimization steps concerned the modification of the conventional oxygen delignification stage and the change of the operating conditions during the final D stage.View full abstractDownload PDF (2252K) -
Masatsugu Taniguchi2001 Volume 55 Issue 4 Pages 484-493,023
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn Japan, the total annual input of mineral resources has reached around two billion tons. In contrast, four hundred and eighty million tons of waste is generated each year of which four hundred million tons is industrial waste from the production processes, and eighty million tons is general waste. Eighty million tons of these wastes are disposed of at landfill sites.
The remaining life of landfill sites in Japan is estimated to be about 1.6 years for industrial waste and about 8 years for general waste. As a result, illegal dumping due to the shortage of landfill sites is becoming a subject of public concern.
Under such circumstances, about twenty five million tons of waste is utilized annually as alternative fuels and raw materials in the Cement Industry of which around ten million is received by Taiheiyo Cement Group.
As a result, the Cement Industry in Japan greatly contributes to the prolongation of the life of landfill sites and has become indispensable to the mineral resources recycling society.
Taiheiyo Cement Group receives waste as alternative fuels and raw materials from in excess of five hundred companies that include 28 different industries. Due to the high level of waste utilization, unit consumption of fossil fuel in our factories is the lowest in the world. As a result of replacing 20% of virgin mineral requirements and 9% of fossil fuel requirements with waste material, carbon dioxide emissions are reduced by 14%. Additionally, as a result of diverting wastes from landfill sites to usable resources in the manufacture of cement, every ton of cement produced represents an equivalent reduction of approximately 188 kg of materials sent to landfill.
Taiheiyo Cement is now regarded as an environmental management services company rather than a manufacturing company.That is the metamorphosis from Manufacturing to Ecofacturing.View full abstractDownload PDF (4614K) -
[in Japanese]2001 Volume 55 Issue 4 Pages 503
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (269K) -
Satoshi Yamamoto, Chizuru Koga, Hiroyoshi Hosomura, Takayuki Okayama2001 Volume 55 Issue 4 Pages 506-513,024
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSCommercial bleached kraft pulps were treated by ozone. Changes in the total halogen and ethanol extractable organic halogen of these pulps as well as brightness, viscosity and the water retention value were investigated during the ozone treatment.The effects of the ozone treatment on the total halogen and ethanol extractable organic halogen of the waste paper were also studied using toner-printed copy paper.
The ozone treatments of the chlorine-bleached pulps and the waste copy paper were carried out at a 4 %(or 30%) pulp consistency and at lot for 5, 10 and 20 min. respectively.
The total halogen and the ethanol extractable organic halogen of the chlorine-bleached pulps were much higher than those of the elemental chlorine-free pulps. The ozone treatment substantially reduced both the total halogen and the ethanol extractable organic halogen of the chlorine-bleached pulps. The ozone-treated pulps from the waste copy paper resulted in a lower total halogen compared with the usual deinked pulp.
The hardwood bleached pulp with a lower brightness showed some increase in brightness after the ozone treatment. Although the pulp viscosity significantly decreased during the ozone treatment. the strength properties of the handsheet from the ozone-treated pulps were slightly changed.View full abstractDownload PDF (2516K) -
Application to Commercial Xerography PapersMakoto Shinozaki, Hitomi Miyata, Tomohito Nakayama, Toshiharu Enomae2001 Volume 55 Issue 4 Pages 514-521,024
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe previous report by some of the authors implied a possible usefulness of the image analysis technique for quantitative discrimination of paper under different brand names. Image analysis is a none-destructive discrimination technique and desirable for forensic purposes. Our previous work employed a cross correlation matching method for the power spectrum of 2-dimensional fast Fourier transform on light transmitted images of paper sheets. This report presents an application of that method to the discrimination of commercial PPC paper under different brand names. PPC paper, i.e. plain paper copier paper or xerography paper, is being produced increasingly and consumed for more variety of purposes these days. PPC paper has been used mainly for black-and-white photocopy in early years but now it is used also for color photocopy, for personal and/or SOHO laser printers and for inkjet printers.
Commercial PPC paper under 12 different brand names provided by different manufacturers were examined as specimens in this work. Ten of the twelve sample and reference files correctly showed the largest similarity when they were correlated with the files obtained under the same brand name. Two pairs of sample and reference files, however, did not show the largest similarity. Both of the pairs showed resembling images when they were inverse Fourier transformed so that typical patterns would be extracted, which means those pairs could have been manufactured from the same machines, respectively.
The results showed that this method of image analysis with Fourier transform was able to discriminate commercial PPC paper under different brand names or their manufacturers.View full abstractDownload PDF (2127K) -
Comparison of Conventional and Modified Kraft CookingsGuo-xin Xue, Jian-weng Zheng, Yuji Matsumoto, Gyosuke Meshitsuka2001 Volume 55 Issue 4 Pages 522-527,025
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSWhen the conventional kraft pulping was applied for Acacia auriculiformis, the transition from the initial to the bulk delignification phase occurred at about 22% delignification and at a temperature 130 to 140°C. Yield and viscosity loss became significant when the kappa number of the pulp was lower than 18. Based on these observation, two modified kraft cooking processes were applied in this study, pretreatment of wood chips with a sodium sulphide solution and with a high sulphidity white liquor, to obtain low kappa number pulp from Acacia auriculiforrnis. Although it was confirmed that pretreatment by these two methods followed by kraft cooking resulted in 3 to 4 kappa number reduction, this reduction were not as large as expected when the viscosity loss was minimized. Because a pulp of kappa number 18 can be easily obtained from this wood by the conventional process in an acceptable yield and viscosity, it does not seem to be beneficial to apply modified cookings to the pulping of this wood.View full abstractDownload PDF (1124K) -
2001 Volume 55 Issue 4 Pages 528-537
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (4276K) -
2001 Volume 55 Issue 4 Pages 539-540
Published: April 01, 2001
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (406K)
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