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Volume 37, Issue 6
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[in Japanese]1983 Volume 37 Issue 6 Pages 422
Published: June 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (206K) -
Kyuzaburo Ishiguro1983 Volume 37 Issue 6 Pages 475-489
Published: June 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSA large number of studies on the factors affecting the dimensional stability and curl of paper, and their mechanism have been carried out to date from the physical viewpoint, and they have given us nearly all phases of fundamental knowledge on the problem. However, arrival at a solution to curl in the mill site by applying these theoretical studies is not easy. Papermakers have tried to solve the problem and are often in a difficulty in the mill because too many factors are involved in the papermaking process, which add to the two-sidedness of the sheet. Antagonistic and/or synergistic interactions of these factors vary according to each mill depending upon the papermaking conditions employed, and these interactions sometimes lead papermaking engineers to take wrong actions. Thus, it is difficult to find a solution to curl problems.
Under these circumstances, this paper deals with theoretical studies on curl by summarizing the works of W. Gally, A. Tydeman and so on. It is imperative to understand their theories in order to find a remedy to the problem in the mill site.
This paper also introduces three reports on actual papermaking experiences on curl, and finally presents the author's own theory and proposal to eliminate the curl of paper.View full abstractDownload PDF (2160K) -
Chuichi Honma1983 Volume 37 Issue 6 Pages 490-500
Published: June 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThis paper describes latest instrumentation in pulp & paper industry, especially this month in sensors followed last month.View full abstractDownload PDF (7442K) -
Kohji Kawaguchi, Hiroaki Mohri1983 Volume 37 Issue 6 Pages 501-507
Published: June 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSCellulose fiber thermal insulation was developed because it made recycling our waste paper possible, had a higher thermal resistance than fiberglass and could be manufactured with a littleenergy consumption.
In Japan cellulose fiber started to be imported 10 years ago in very small scale from U. S. manufacturers.
At the end of 1978 Jujo Paper Co., Ltd. began manufacturing this material domestically and rapidly expanded its market.
With our own technology, we have improved characteristics of cellulose fiber such as much higher fire resistance, anti-corrosiveness treatment and water repellent effect.
These points are to be specified in Japanese Industrial Standard which will be established in the very near future.
In this paper characteristic properties and blowing systems of cellulose fiber are described in short.View full abstractDownload PDF (1025K) -
-Abekawa Paper Co., Ltd.-Abekawa Paper Co. Ltd.1983 Volume 37 Issue 6 Pages 508-514
Published: June 01, 1983
Released on J-STAGE: January 29, 2010
JOURNAL FREE ACCESSAbekawa Paper Co., Ltd. was established in 1935 and started up to manufacture insulating papers. Presently it produces various of high quality papers and converted Papers. It owns two mills in Shizuoka city ; one is main mill and the other is separator mill which is specialized in the manufacture of battery separator.
The main mill area is about 55, 300m2 and separator mill area is about 6, 200m2.
The employees are nearly 390. The main products are as bellows ;
Electrical insulating paper ……Pressboard, Coil insulating paper, Adhesive insulating paper. ete,
Office paper……OCR paper, MICR paper, On-line bank book paper, Water mark security paper. etc
Fancy paper……Embosser paper, Laid paper, various color papers. etc
Others……High press melamine decolative base paper, Battery Separator, Protect bag paper for fruits growth, Drawing paper. etcView full abstractDownload PDF (8082K) -
Akio Okagawa1983 Volume 37 Issue 6 Pages 515-521
Published: June 01, 1983
Released on J-STAGE: November 13, 2009
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Hiraku Nihei1983 Volume 37 Issue 6 Pages 523-529
Published: June 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSLately the methane fermentation process has captured a great deal of interest as one of the new methods of generating energy. This new method was first applied with pulp and paper waste water in our mill. Our mill has successfully utilized evaporator condensate of spent sulfite liquor in this process.
The process produces 15, 00017, 000 Nm3gas/day. At the same time, as a result of this treatment, 23 ton CODcr/day, 6 ton CODMn/day, and 14 ton BOD5/day are removed from the waste water. The production cost of the gas equals the price of oil, if they are compared based on heat value. Sedimentation and the activated sludge processes, which are currently the common methods of waste water treatment in our industry, consume considerable energy. Our method of environmental protection requires less energy than the other methods. Furthermore, it becomes a source of new energy.
The present waste water treatment may be replaced by the methane fermentation process in the near future.View full abstractDownload PDF (935K) -
Katumi Okubo, Hisao Ishikawa1983 Volume 37 Issue 6 Pages 530-536
Published: June 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSIn order to modify thermomechanical pulp (TMP) a study was made of NaOCl·H2O2 and NaOCl·O3 bleaching under mild conditions. The results obtained were as follows.
(1) Under the optimum conditions, TMP prepared from mixed soft woods was soaked in a 4% available chlorine-contained NaOCl solution (pH 11) for 10 min. at room temperature, and then after removing excess NaOCl solution, bleached with H2O2 solution (H2O2, 15% per pulp) for 1 hour at 50°C.
The brightness of TMP bleached under the above conditions increased from 40% to 70% GE. The yield of bleached pulp was 93%. The water retention value and the sheet density of TMP also increased by bleaching. The tensile strength, burst factor and tear factor of TMP after bleaching were 2.7 km, 1.2 and 81, respectively.
(2) A new bleaching of TMP by NaOCl·H2O2 system was clarified to be more effective method than NaOCl·O3 system for bleaching without decreasing the mechanical properties.View full abstractDownload PDF (932K) -
Akio Mita, Susumu Kashiwabara, Eiji Kawamura, Shigeaki Imai1983 Volume 37 Issue 6 Pages 537-547
Published: June 01, 1983
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSStudies were carried out on the prepared of a new chemical pulp (PAP) and semichemical pulp (PASCP) from bagasse without depithing by hydrogen peroxide-alkali (PA) process.
The cooking liquor was a mixture of water, hydrogen peroxide 15%, sodium hydroxide 1020%, on raw materials and small quantities auxilialies, (chelating agents : EDTA or DTPA0.3%, and anthraquinone AQ 0.010.05% on raw materials) the liquor ratio of mixture to bagasse being 10 l/kg. PAP (total yield of 46.554.2%, rejects 1.08.8% and the screened 38.648.4%) was easily obtained from bagasse without depithing after cooking for 11.5 hours at about 150°C.
Increasing alkali in PA cooking liquor resulted in increasing the screened and decreasing rejects. Increasing hydrogen peroxide in PA cooking liquor resulted decreasing rejects and Kappa no. of the screened. Increasing of AQ in PA cooking liquor resulted incresing in the screened and decreasing rejects.
The analysis of unbleached PAP gave kappa no. 5.011.5, Klason lignin about 1%, pentosan 2126% and whiteness 4048 Hunter. Unbleached PAP C-402 (total yield 48.0%, rejects3.1%, the screened 44.9%, kappa no. 7.5) has breaking length 4.5 km at 336 ml C. S. F.
Bleached PAP C-104 (at 175 ml C. S. F.) has breaking length 6.7 km, burst factor 3.9, tear factor 49, folding endurance 290.View full abstractDownload PDF (4175K)
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