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Volume 36, Issue 5
Displaying 1-8 of 8 articles from this issue
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Kyuzabro Ishiguro1982 Volume 36 Issue 5 Pages 501-512
Published: May 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSVarious surveys on energy use and save-energy technologies in the papermaking process are made in this paper, which are summarized as follows.
1. Perspective on energy availability and price in the future are outlooked both in Japan, America and Europe.
2. Present energy consumption in the papermaking process in Japan is not so much as that in America and Europe, with the future stringent energy outlook expected, however, continuous efforts should be made in reducing energy consumption in the papermaking process in Japan.
3. Several newly developed save-energy technologies are described on each part of a paper machine, with up-to-date examples illustrated.
4. In applying a save-energy technology in the paper making process, especially the quality of the paper product should be paid much attention as well as the amount of energy reduced.
5. Strengthening the dewatering capacity in the press part and the no-draw-press system improve the operation in the printing room as well as reduce the energy requirement in the papermaking process.View full abstractDownload PDF (1329K) -
Bengt Arhippainen1982 Volume 36 Issue 5 Pages 513-529
Published: May 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSReview of the impact that the increasing cost of energy has had on the pulp mill process is given, and various data are available.
Energy balance of logical or hypothetical kraft pulp mills is discussed in comparison of old and modernized types. As to the process development for medium consistency pulping, the ideal ultimate solution would be that the digester pressure moves the pulp at blow consistency to storage through washingh, screening and bleaching. Many other process developments in pulp industry are described.
It is startling how different results can emerge from the interaction between process selection and the cost of fuel and power in the hypothetical mills, which can be seen guided by internal pricing of enegy.
We do already have the knowledge to build a wood pulp mill which is entirely independent of both fossile fuel and external power, and has a substantial excess of both heat and power. The process can be developed so, that the heat demand is reduced to about 50%, and the power demand to about 65% of the present in regard to the present average mill.View full abstractDownload PDF (1519K) -
Takasago Mill, Mitsubishi Paper Mills, Ltd.Mitsubishi Paper Mills Ltd.1982 Volume 36 Issue 5 Pages 530-537
Published: May 01, 1982
Released on J-STAGE: February 22, 2010
JOURNAL FREE ACCESSTakasago City, located at the mouth of the Kako River-about 20 km west of Kobe, used to be a traditional port town, but has made a remarkable progress as an industrial city as well in the past decades.
The mill's history dates back in 1901, only three years after the company's foundation (1898). Since its origin, Takasago Mill has undertaken development of several specialty papers and is still characterized now as a specialty paper mill among Mitsubishi's sister mills. with its one cylinder machine, seven fourdriniers, and five coaters, the mill manufactures 217 tpd of papers including 120 tpd carbonless copy paper, tracing paper, cast-coated paper, capacitor tissue, etc.
The mill ground covers 13, 000 sq. m in eastern part of Takasago City and has about 600 employees.
Waste water of the mill is discharged to the Inland Sea after sedimentation treatment. Stack gas is desulfurized by a Magnesium Process.View full abstractDownload PDF (1451K) -
1982 Volume 36 Issue 5 Pages 538
Published: May 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (131K) -
I. Morphological CharacteristicsJunji Ohsawa, Toshinori Ohtake, Yutaka Yoneda1982 Volume 36 Issue 5 Pages 539-544
Published: May 01, 1982
Released on J-STAGE: February 22, 2010
JOURNAL FREE ACCESSPollution Free Pulping process was developed and the pilot plant test was carried out since 1973 until 1976 in our research institute. This process is a full closed system non-sulfur pulping and there are two variations in the bleached pulp yield, ca. 50 and 60%. The low yield process is similar to soda pulping and the high yield process is a kind of holopulping. In the high yield process, hardwood chips were chemimechanically prefiberized in an Asplund defibrator before the selective delignification with Cl2, NaClO, ClO2 and NaOH.
In this paper the effect of defibration on the bleached pulp morphology, especially the production of secondary fines, was studied.
Defibration of hardwood chips under the condition of lower softening degree, that is, at lower temperature and lower alkali charge, involves the reduction of long fiber content and also the increase of broken vessel content. Furthermore, the defibration below 150°C involves the intense fibrillation of wood fibers and the lower freeness of bleached pulps. All these secondary fines such as shorten fibers, fragments from broken vessel walls and fibrils contribute to the increase of fine fraction content.
The broken vessel content increases with increasing vessel diameter, such that Buna (Japanese beech) <Eucalyptus<Red Lauan, under the same defibration condition.View full abstractDownload PDF (1284K) -
A Microcomputer-based Data Processing System forWet End Chemistry 1Fumihiko Onabe1982 Volume 36 Issue 5 Pages 545-556
Published: May 01, 1982
Released on J-STAGE: February 22, 2010
JOURNAL FREE ACCESSThis paper describes the experience of systems design and software development for a microcomputer-based data processing system for the zeta potential, hydrodynamic permeability, and electric conduction measurements by the streaming current method. The system is based on NEC's microcomputer PC-8001 with 8 bits microprocessor Z-80 as CPU. The user's memeory capacity (RAM) is ca. 27 KB, which is sufficient to apply to the streaming current method. Audio cassette tapes were used as sequential data files of the system. The signal transfer speed of the cassette recorder is 600 Baud (bits/sec) and the time required to file one set of data was 191 sec.
The data input was performed in (6 × 7) matrix form and the excecution time for one set of data was ca. 9 sec.
The programming language is a modified BASIC developed by Micro Soft Inc. and programmes were developed in conversational mode using a video display. The software package consists of three programmes : (I) Batch computational mode, (II) Data filing mode, (III) Data reading and computational mode.
Although the execution time of interpreter-based microcomputer using BASIC is longer than that of the compiler-based large-scale computer using FORTRAN, the turn-around time is shorter for the microcomputer.
The microcomputer-based data processing system permits flexible programming due to sufficient memory capacity and conversational programming procedure. The system installed in a laboratory permits quick visual judgement of the results right after the experimental work using graphical functions on the screen of a video display and by the statistical treatment of the output data.
This paper is a part of the presentation at the “1981 Papermaking Conference” sponsored jointly by the Japan Tappi and CPPA (October 1981, Tokyo).View full abstractDownload PDF (2235K) -
Research on Manufacture of Pulp Cement Board Using Recovered Pulp from Municipal Solid Waste for Reinforcement (Part I)Ryukichi Matsuo, Yoshinari Kobayashi, Takao Kitamura, Shunsaku Kato, M ...1982 Volume 36 Issue 5 Pages 557-564
Published: May 01, 1982
Released on J-STAGE: February 22, 2010
JOURNAL FREE ACCESSIndustrial manufacturing possibility of pulp cement board (PC board) was studied using various grade pulps recovered from municipal solid waste with intention of simplifying purification processes as well as opening the way for production of such composites as construction materials from the waste. Although roughly purified pulp abbreviated as Sample A was found to have some obstraction to cement curing, this defect was obviated by lowering stock consistency and prolonged agitation. Treatment of Sample A with NaOH solution and limited amount of alkaline NaOCl solution improved the curing to give PC board with higher bending strength. The curing improvement by these factors was assumedly ascribed to removal of obstacling increments for the curing and lowering ζ potential of the pulps. Under improved conditions, the roughly refined pulp was found to be rather superior reinforcing fibers except for containing fine foreign matters which could be compensated by covering decoration. The most suitable pulp content was 13 wt%. The PC board produced from Sample A satisfied both JIS and fire-preventing specifications.View full abstractDownload PDF (1033K) -
[in Japanese]1982 Volume 36 Issue 5 Pages 565-569
Published: May 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (725K)
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