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Volume 37, Issue 12
Displaying 1-8 of 8 articles from this issue
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Technology on TMP and CTMPAkira Yamaguchi1983 Volume 37 Issue 12 Pages 1057-1070
Published: December 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThis paper deals with forcussing on the following articles.
1) General tendency in TMP manufacturing technololy.
2) The state of the art in CTMP processes and other modification processes.View full abstractDownload PDF (1546K) -
Akira Nomoto1983 Volume 37 Issue 12 Pages 1071-1078
Published: December 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSOptimal steam allocation which reduces the total cost of steam generation and purchased electrical power to a minimum, is achieved by the complex strategy of Linear Programing. This computer control system was applied to six turbine generators in Ishinomaki Mill of Jujo Paper Co., Ltd. in 1981. Since then it has provided a lot of energy saving in satisfactory operation.View full abstractDownload PDF (5044K) -
Fumiaki Nagashima1983 Volume 37 Issue 12 Pages 1079-1084
Published: December 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe pulp and paper industry is a highly energy-intensive industry in Japan consuming huge amount of energy next to steel and cement industries.
One of the major challenges facing our industry is to raise the self-supplying ratio of its energy consumption, which can be achieved, among others, by utilizing paper sludge effectively as fuel after dewatering it to higher dryness.
Starting from August, 1982, the Ashigara plant of Meiji Seika Kaisha, Ltd. succeeded in dewatering the sludge generated in the plant (e. g. from the activated sludge process waste water treatment facilities) to a high dryness, and burning it in a multiple hearth incinerator without the aid of fuel oil.... contributing greatly to the reduction in energy consumption.
The intensive dewatering system of sludge employed by the plant features in (i) pelletizing the sludge from the primary dewatering stage, and (ii) mixing the pellets with the furnace ash, product of the preceding cycle, and (iii) squeezing them by a hydraulic press.
It is a noteworthy technique in that it has achieved a dryness level that was considered economically prohibitive.View full abstractDownload PDF (5380K) -
-Ashikaga Mill, The Japan Paper Industry Co., Ltd.-The Japan Paper Industry Co. Ltd.1983 Volume 37 Issue 12 Pages 1085-1089
Published: December 01, 1983
Released on J-STAGE: January 29, 2010
JOURNAL FREE ACCESSAshikaga Mill of The Japan Paper Industry Co., Ltd. was established in Ashikaga City, which started its operation in 1959.
This paper mill manufactures jute liner and corrugating media with two paper machines.
The mill site area is about 65, 000 m2, and the employees are 190.View full abstractDownload PDF (9552K) -
1983 Volume 37 Issue 12 Pages 1090
Published: December 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (125K) -
Fumio Ohba1983 Volume 37 Issue 12 Pages 1091-1101
Published: December 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSEffects of variations in toughness on the service strength of heavy duty paper sack were investigated, assuming that distribution of toughness values of paper is Gaussian and energy distribution f (E) dissipated for failure of paper sack at drop test is expressed with the formula f (E) =1/be-E/b
Correlation between service strength of paper sack and (x-σ2/2b) -value of toughness of paper was slightly higher than only average value x of toughness, where σ is standard deviation of toughness of paper. However, the influence of variations on the correlation was generally little.
It was considered that effects of variations in toughness of paper on the service strength of paper sack did not appear so clearly under variations in conditions of each drop and in environment such as humidity at drop test or in making paper sack.
The b-values in the equation were associated with the average energy dissipated for failure of paper sack and they were found to be 1.01, 0.74 and 0.51 for butt drop, overturn drop and face drop tests, respectively. This means that butt drop is the most severe and face drop is mild for paper sack at drop test.View full abstractDownload PDF (1159K) -
Aggregation and Dispersion Behaviours of Phenolic Compounds.Yoshito Ohtani, Kazunori Miura, Masashi Sumimoto1983 Volume 37 Issue 12 Pages 1102-1108
Published: December 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSIf either the pKa value of a phenolic compound in the extractives becomes lower or its HLB value higher, as is generally expected, there is a tendency to decrease in its residual amounts in sulfate pulps by being surrounded by the neutral carrier and therefore, protected from alkaline attack. Direct comparison of the speck areas appeared in pulps as a result of aggregation of phenolic molecules dose not seem to give a clear-cut relation among speck area, pKa, and HLB value. However, this is realized by comparing the speck areas S based on a certain amount of residual phenol, R i. e. S/R ratio as shown in Figure 5 and 6. The lower the pKa value of a phenol and also the higher the HLB value of it, the greater ability for aggregation of the phenolic molecules is observed.
A sterochemical environment around the phenolic hydroxyl group was shown to be an additional and important factor for aggregation, and the greater steric hindrance of a phenol could afford less speck area. The reason for giving no speck area in the case of ferruginol and its derivatives, differently from other phenols, may be ascribed to great contribution of the steric hindrance in addition to the relatively low HLB value. Hydrogen bond formation through 12-hydroxyl group to afford an aggregate is prevented firstly from neighbouring 13-isoprophyl group and secondly from interaction between 11-H and 1β-H. Colored substances produced by the treatment of ferruginol with chlorine dioxide, therforfore, do not give any visible speck but disperse uniformly in bleached pulps to lower the brightness.View full abstractDownload PDF (1012K) -
Delignification Rate StudiesMotonobu Kubo, Hidetoshi Yoshioka, Masato Tamao, Takeo Ueno1983 Volume 37 Issue 12 Pages 1109-1115
Published: December 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSIt is known that the kraft cook can be separated into three stages; initial phase, bulk delignification phase and final phase. A chemical reaction is a rate-determining step for delignification under the condition in which the chip thickness is below certain value, except in the initial phase. Delignification rate in the two stages, bulk delignification phase and final phase, was studied.
Assuming that the delignification is reversible reaction, it was found that the delignification rate in the two stages, bulk delignification phase and final phase, could be expressed as a single kinetic equation. In addition, the effect of reaction temperature and concentration of cooking chemicals on the delignification rate was revealed quantitatively. The rate equation, which was established in the previous report for effective alkali consumption by wood components, was applied to the kinetic equation of delignification in order to determine the numerical solution. These numerical solutions fit to the experimental results successfully. While this method involves some assumption, it is useful to describe the delignification rate quantitatively under the condition of timevarying liquor concentration.View full abstractDownload PDF (986K)
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