All issues
Volume 38, Issue 7
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Takashi Kadoya1984 Volume 38 Issue 7 Pages 717-725
Published: July 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSPaper is a multilayer structure of fibers with numerous micro-scale pores. Almost all the pores in paper consist of tortuous capillarylike tubes that are continuously interconnected.
Therefore, paper is permeable and can absorb liquids and gases. The most obvious utilization of the tortuous capillary structure of paper are filter paper, blotting paper, and so on. Furthermore, paper-converting operations involve penetration into the voids of paper by coating, adhesives, ink, and so on. In these processes, liquids such as wax, paraffins, silicones, and oilbased ink are applied to paper in non-aqeous form, whereas latex, silicon emulsions, and waterbased ink are basically aqueous liquids.
The fundamental theory of the wetting and penetration phenomena of paper holds for both aqueous and nonaqueous liquids.
However, in the aqueous case, fiber swelling and wetting cause deviations from the clasical theory of the penetration of porous media. This paper includes the two kind of penetration phenomena such as an oil-based ink for nonaqueous liquid and water based coating colour for aqueous liquid.View full abstractDownload PDF (1517K) -
Mineo Mizubayashi1984 Volume 38 Issue 7 Pages 726-732
Published: July 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThis paper prerents the results achieved through advanced computer control applied to a Recovery boiler. The original objectives of the control project were to reduce costs associated with boiler operation, increase pulp mill capacity by increasing black liquor throughput and enhance the safe operation of the process. To achieve these project objectives a Measurex computer control system was installed on the boiler.
Included in the Measurex system was a flue gas analyser (for in-stack measurement of CO, CO2 SO2 and opacity) and the following controls:
CO-based combustion control
Reduction zone temperature maximization control
Droplet size control
Sootblowing control
Blackout detection control
Tie line control
Load allocation control
The control project has been judged to be most successful, producing process improvements and return on investment greater than those originally expected.View full abstractDownload PDF (938K) -
JAPAN PAPER AS SOCIATION1984 Volume 38 Issue 7 Pages 733-743
Published: July 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESS -
Nakagawa Mill, Mitsubishi Paper Mi-llNs, Ltd.Mitsubishi Paper Mills Ltd.1984 Volume 38 Issue 7 Pages 744-749
Published: July 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSNakagawa Mill is located in the northeastern part of Tokyo and was constructed in 1917.
The mill has six machines, three coaters and other equipments for producing high quality papers and variety of specialty grades of papers. The main products are printing papers, art papers and other special kinds of paper including photographic basepapers. Another special product is non-woven fabric.
Most of pulp is supplied from Mitsubishi's sister mills-Kitakami and Shirakawa, and others are imported.
The mill site area is about 172, 000 m2 and the number of employees are about 690.View full abstractDownload PDF (2975K) -
Motonobu Kubo, Hidetoshi Yoshioka, Masato Tamao, Takeo Ueno1984 Volume 38 Issue 7 Pages 765-768
Published: July 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe kinetic equation, established in the previous paper for Japanese oak (Quercus mongolica), was applied to describe the delignification of mangrove (Rhizophora sp.) and eucalyptus (E. calophylla) during kraft cooking. Although the lignin contents of uncooked wood chips and the apparent delignification patterns of those three wood species differe from one another, the values of rate constants and activation energies were identical respectively. According to the above kinetic equation, the distinction of apparent delignification patterns, which depended on the wood species, were described by the term “L∞”(lignin content at the cooking time t→∞) and the lignin content at the starting point of bulk delignification. Consequently, the kinetic model proposed by us seemed to be preferred for general use in describing the delignification during kraft cooking quantitatively.View full abstractDownload PDF (710K) -
Djamal Sanusi, Yasuo Kojima, Tsutomu Kayama1984 Volume 38 Issue 7 Pages 769-774
Published: July 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThis investigation was carried out to study the effects of various chemical pretreatments and different chemical pulping methods on the strength properties of corresponding chemithermomechanical pulp (CTMP) and chemical pulps from red lauan.
In CTMP, chips were pretreated with cold soda, hot soda, alkaline sulfite, bisulfite and neutral sulfite prior to fiberization. The strength properties of CTMP increase in the order of cold soda<hot soda<alkaline sulfite<bisulfite<neutral sulfite pretreated chips.
In chemical pulping, chips were cooked by means of the following cooking methods: kraft, alkali-methanol and cresol-water pulping. It showed that at the cooking temperature 170°C, there was no difference between the strength properties of alkali-methanol and kraft pulps except tear factor. The cresol-water pulping on the other hand, produced pulps with inferior strength properties but more effective in dissolving alcohol-benzene extracts compared to those of the alkali-methanol and the kraft pulping.View full abstractDownload PDF (1003K) -
Charge of Chemicals and Treating TemperatureNorio Takamura, Kazuhiko Sameshima1984 Volume 38 Issue 7 Pages 775-781
Published: July 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSBast fibers of Mitsumata (Edgeworthia papyri fera Sieb. et Zuce.) were cooked forpreparing paper making pulp using ammonium oxalate solution under various concentrations (Table 1) and temperatures (Table 2). Pulping tests after immersion of raw materials inammonium oxalate solution at room temperature (20°C) were also done (Table 3).
It was shown that ammonium oxalate gives much stronger pulp of higher yield than those obtained by the conventional alkaline process (Fig. 1-6). The immersiontreatment of bast fibers in ammonium oxalate solution at room temperature was also effective formaking pulp enough to give high strength of paper (Fig. 7-9).
These results indicate that ammonium oxalate acts as an adequate solute to removethe pectic substances from the pectocellulosic plant fibers effectively and makes fibers tobe easily defiberized with few damages of fibrous construction.View full abstractDownload PDF (1070K) -
[in Japanese]1984 Volume 38 Issue 7 Pages 782
Published: July 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (175K)
- |<
- <
- 1
- >
- >|