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Volume 54, Issue 7
Displaying 1-17 of 17 articles from this issue
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[in Japanese]2000 Volume 54 Issue 7 Pages 872
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (248K) -
Hiroshi Ohi2000 Volume 54 Issue 7 Pages 873-882,013
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSChemistry of kraft pulp production was summarized from considering recent environmental plans. Levels of dioxins and chloroform emission in regulations were shown first, and then chemical feature of lignin, reactions of lignin and carbohydrates during kraft pulping, structure of residual lignin in pulp, reactions of chlorine and chlorinated chemicals in bleaching and roles of various acid treatments of pulp were reviewed. In addition, reactions of hydrogen peroxide and its possibility were discussed, and a study by the author and others, non-chlorine bleaching with acid treatment for manganese reduction removal followed by hydrogen peroxide bleaching, was introduced.View full abstractDownload PDF (2192K) -
Mutsuaki Hisada2000 Volume 54 Issue 7 Pages 883-890,013
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn Japan. the percentage of recycled paper in paper manufacturing and the percentage of imported pulpwood in all pulpwood both exceeded 50% in 1989, and these figures never appear going down again. Around that time. Japanese pulp and paper companies began overseas industrial forest plantation projects, and approximately ten years have passed since then. At this moment, projects are found in eight countries with the total area reaching to 258, 000 ha at the end of 1998. In the past, they were relying upon the imported wood materials out of natural and artificial resources. But nowadays in order to reduce its dependency, most of our overseas industrial plantation projects have been commenced by targeting to import wood chips out of own plantation.
Meanwhile, an increasing number of electric power companies and automobile companies have begun to participate in overseas forestry projects after it was decided that the amount of CO2sequestration by forests would be internationally recognized as an offset to greenhouse gas emission at COP 3 conference in Kyoto (1997).
Therefore, in order to promote further plantation it is required to get and to handle accurate information to settle many unsolved issues.View full abstractDownload PDF (2709K) -
(Phase 1) Brown Stock ProcessFumio Shindo2000 Volume 54 Issue 7 Pages 891-898,014
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn order to provide and share the technical information among Japanese pulp and paper industries, Pulping Technical Committee surveyed Kraft pulping operations of '98 fiscal year (Apr.'98 to Mar.'99). We received the answers from 34 mills, except one mill, out of 35 domestic KP mills.
This report summarizes results of the above investigation, concerning operational conditions and equipment of brown stock process which covers from cooking to post oxygen washing through oxygen delignification.View full abstractDownload PDF (2487K) -
Koichi Tabei2000 Volume 54 Issue 7 Pages 899-911,014
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSPulping Technical Committee of J. TAPPI made questionnaires about 1998 operating data of kraft pulp mills in Japan. This paper was the second report of that questionnaires and the report about bleaching process, the manufacturing of bleaching chemicals and the treatment after bleaching (screening. cleaning, etc). There are 50 BKP lines (30mills) and 6 semi-bleaching KP lines in Japan. Only 4 lines (3mills) have not Oxygen delignification stage. There are 3 ECF bleaching lines and all of them are first-D sequence. Ozone is not used as pulp bleaching chemicals in Japan.
First bleaching stage of major BKP lines is C (23 lines) or C/D (24 lines. C/D=87/13). About 75% of alkaline extraction stage are reinforced by oxygen and/or hypochlorite or hydrogen peroxide. 46 lines use hypochlorite and 11 lines use hydrogen peroxide and 21 lines use DnD as last stage and 1 line use xylanase as pre-bleaching stage. Average addition of chlorine and total available chlorine is 18.0kg /t and 29.3kg/t. Average kappa number of UKP is 11.4 (10.2, LUKP) and the brightness and the viscosity 85.8 and 15. 8 cp. Average COD discharge and effluent water from bleaching process is 15kg/t and 31m3/t.View full abstractDownload PDF (6288K) -
Stig Andtbacka, Michio Imai2000 Volume 54 Issue 7 Pages 912-932,015
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDevelopment in cooking has been very rapid during the two latest decades. New cooking methods giving improved pulp quality and better bleachability are today available. Kvaerner Pulping has now further developed the continuous cooking process and we are now marketing a new system called Compact CookingTM. Mill results from Compact CookingTM will be discussed. Kvaerner Pulping has also developed a new oxygen delignification system called DUALOXTM. Mill results from the first installation will be given.
Total Chlorinefree Bleaching (TCF) was a very hot issue especially in Scandinavia and Germanspeaking countries 6-7 year ago. The most exciting enthusiasm for TCF bleaching is today slowly changed to a more realistic and correct view on bleaching and its environmental impact. ECF bleaching sequences with low content of chlorine dioxide so called soft ECF are today recommended and installed in many mills. Results from such installations are discussed.
Total Effluentfree Bleaching (TEF) is still under development. There are today several mills which have tried different solutions for closing the bleach plant completely. So far nobody has succeeded completely. In the following the new modern Kvaerner Pulping fiberline will be described. The presentation will mainly focus on new Kvaerner Pulping developments.View full abstractDownload PDF (12236K) -
Application to ECF Bleach with Acid HyrolysisChiaki Kawakami, Olavi Pikka2000 Volume 54 Issue 7 Pages 933-942,015
Published: July 01, 2000
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSOzone bleaching technology was developed in early 90's and introduced to mills for implementing TCF bleaching during 90's. Today ozone bleaching is used as part of ECF bleaching sequences, for instance, at UPM Kymmene Wisaforest, Finland and Modo Paper Husum, Sweden. The ozone based ECF pulp is called as ECF-light and is appreciated in Europe. In using ozone bleaching for ECF bleach sequences, it has been seen, ozone is effective to save bleaching cost and to add side-benefits of reducing pitch problems. At Wisaforest, in the ozone based ECF bleach mill, some part of bleach effluent is recovered to implement semi-closed system.
Ahlstrom Machinery has developed an advanced unique ozone mixer, AMZ mixer, which is effective for selective ozone delignification, while mechanical damage to pulp is minimized. Further study on comparison between mill ozone systems with AMZ mixers and lab. ozone bleaching has indicated that mill ozone bleaching with AMZ mixer shows for better bleacheability at the same chemical charges. AMZ-MC ozone bleaching is today a fully proven technology.View full abstractDownload PDF (3736K) -
Monica Bokusröm, Toru Kobayashi2000 Volume 54 Issue 7 Pages 943-948,016
Published: July 01, 2000
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSOzone bleaching has been applied in ECF and TCF bleaching sequences since the beginning of the 1990's. It has confirmed by actual data and laboratory tests that applying the ozone system in ECF sequence can save bleaching chemical costs and makes the plant with a very simple sequence without acid treatment or other treatment.
In this paper, a simple comparison between high consistency (HC) and medium consistency (MC) ozone system, advantages for HC ozone system, actual plants and HC ozone system application in ECF bleaching sequences will be discussed.
Especially. a discussion of a simple sequence of (Z (Eo)) DnD as a Light ECF sequence must be very interesting in view of its powerful effect, chemical savings, reducing effluent mount, pulp quality without having an additional acid treatment and chlorine dioxide stage.View full abstractDownload PDF (3575K) -
To Aim at Lower Cost, Higher Productivity and Better Paper QualitAlexander Wasserman, Osamu Fujimura2000 Volume 54 Issue 7 Pages 949-952,016
Published: July 01, 2000
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSBoard machine for high capacity production are today limited by design. These well known limits are, e. g the following.
Multi-fourdrinier forming technology is state of art, however limits can be seen at higher speeds. Combination of several straight through roll presses brings about the drawback of the loss of bulk. Double-tier drying sections have the disadvantage of non restraint drying which leads to shrinkage effects such as roughness increase or MD tensile decrease at the web edges.
IHI-Voith Sulzer Paper Technology is constantly developing new and adapted machine concepts in respect to high output, high efficiency and high quality in order to overcome the above-mentioned limits.
This paper shows possible solutions in a combination of proven machinery elements which leads to a IHI-Voith Sulzer Paper Technology vision for future production plant with basis weight 160-400g/m2, wire width≤10.5 m, operating speed 600-1, 000m/min and max. production≤3000 t/d.View full abstractDownload PDF (2729K) -
Anders Dahl2000 Volume 54 Issue 7 Pages 953-959,017
Published: July 01, 2000
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSCellchem is the contracting and engineering division of Eka Chemicals, the largest producer of sodium chlorate in the world. Cellchem has actively been developing and promoting technology within the chlorine dioxide field for many years. Basically all processes of commercial use in the world today are on our product program.
In this paper we will focus the attention on the most interesting processes considering the needs of the pulp mills in Japan. The selected processes to be highlighted are SVP-LITE® and HP-ATM. SVPLITE®process is very reliable and safe to operate and is the most economic and popular process today. HP-ATM process is especially attractive when converting older atmospheric system to newer technology. Capacity expansions of 1.5-2 times can be achieved utilizing existing reactor systems.
We will also briefly present a new developed add-on process to SVP-LITE® or SVP-HP. It is called Generator Liquor Split process. SVP-GLS. It basically converts the saltcake by-product into acid and caustic soda.View full abstractDownload PDF (3991K) -
Hideto Matsui2000 Volume 54 Issue 7 Pages 960-967,017
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSNew Inspection System (ASP-P 3500-M) adoption 3 CCD Color line sensor. Distinction is pattern matching. This System is detection a small defect and a light defect. Conception a development easy operation and high capability and detection stability. System consists of Sensor unit, Indicate unit. Conduct unit and Control unit. Indicate unit is Dos/V PC (Windows NT). Conduct unit is SBC (OS-9).
Control unit is PLC. High technology used all units. We are confident this System of a highly efficient detection.View full abstractDownload PDF (4104K) -
[in Japanese]2000 Volume 54 Issue 7 Pages 965
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (257K) -
[in Japanese]2000 Volume 54 Issue 7 Pages 968
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (161K) -
Alkaline oxygen pulping of kenaf bast and bleaching of kenaf oxygen pulpAorigele, Yoshihiro Sano2000 Volume 54 Issue 7 Pages 969-976,018
Published: July 01, 2000
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSKenaf basts with brown and green epidermis (Hibiscus cannabinis) were subjected to alkaline oxygen pulping to fill up a deficiency of softwood kraft pulp in future. Fifteen % NaOH of bast was necessary for the brown epidermis to decolorize during the pulping. However, the latter yielded crude pulp without colored epidermis by the pulping with 8-15% NaOH at 7kg/cm2 and 110°C for 1h. The crude pulps with kappa numbers of 44-54 in yields of 67-78% based on bast gave oxygen pulps with kappa numbers of 21-31 in yields of 56-59% based on bast when refluxed with 50-70% aqueous AcOH for 1 h. The oxygen pulps were full-bleached by sequence of 5% Pa-1% P-1% Pa-1% P and so forth. Strength properties of the oxygen pulp and full-bleached pulp obtained from both of the bast were compared to the properties of unbleached and bleached kraft pulps of softwood.View full abstractDownload PDF (2518K) -
Latex Concentration of Coated Paper SurfaceKoji Okomori, Hirokazu Morii, Hideki Fujiwara2000 Volume 54 Issue 7 Pages 977-985,018
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSWater retention of a coating color on base paper influences final properties of the coated paper and the blade coating operation. However, there is not any standard method to evaluate water retention of a coating color even though several have been suggested. We separated “Water Retention” into static water retention and dynamic water retention. Coating runnability was evaluated by the two kinds of water retention. Water loss rate at short dwell time influenced coating runnability under a blade. Binder in a coating color also penetrated into base paper with water when the coating color was applied. We measured water loss rate of actual coatings and dilute latex emulsions to evaluate a trend of binder penetration. Binder went through a membrane filter and penetrates into filter papers when water loss ratio was measured under pressure. This binder penetration was measured by ultraviolet absorption in refection. We suggested two new concepts “Total Latex Loss” and “Penetrating Latex Loss”, both calculated from these signals and the depth of latex penetration. Binder penetration, high shear rate viscosity and water loss rate should be combined well to have a good coating runnability and to produce high quality papers.
In this study, the effects of blade response and binder penetration on the latex concentration of coated paper surfaces were investigated. The blade response depended on water retention and high shear rate viscosity. The binder penetration depends on water loss ratio, total latex loss, and penetrating latex loss. Our results showed that latex concentration of coated paper surface depended on blade response and the type of binder penetration.View full abstractDownload PDF (3476K) -
Shigeo Matsushima, Tadashi Yano, Satoru Matsushima2000 Volume 54 Issue 7 Pages 986-995,019
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSA formulation of the anisotropic elastic deformation was performed for the single wall corrugated fiberboard (SWCF) under the uniform tensile load. From this formulation the anisotropic longitudinal elastic modulus was determined for SWCF induced by elastic moduli of anisotropic element materials, and the validity of the formulation was guranteed by experimental results under the tensile deformation. Farther the anisotropic character for the modulus was elucidated.
The deformation of SWCF obtained from the formulation shows the remarkable anisotropy. The anisotropy of SWCF increases with increase of the wavelength for semichemical corrugating medium (SCM), and decreases with increases of the thickness and the waveheight of SCM.View full abstractDownload PDF (2120K) -
2000 Volume 54 Issue 7 Pages 996-998
Published: July 01, 2000
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (553K)
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