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Volume 35, Issue 9
Displaying 1-8 of 8 articles from this issue
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Kenichi Shiinono1981 Volume 35 Issue 9 Pages 755-766
Published: September 01, 1981
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSInstitute of Pulp and Paper Industry Shizuoka PrefectureThis report is investigated on recent utilizations and the progress of developments for resource of paper sludge in Shizuoka prefecture. These utilizations and developments are discussed on two parts, sludge and ash. The report deal with agricultural materials as compost and food for an earthworm, industrial materials for cement and iron making mill, constructive materials as board, ground stabilizer.View full abstractDownload PDF (1722K) -
Tsuyio Nakamoto1981 Volume 35 Issue 9 Pages 767-774
Published: September 01, 1981
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSIt appears to be of great significance to discuss about the reproduction of halftone dots in offset printing, because offset process is most prevailing in Japan according to the statistics based on the investigation of each printing process.
If dots reproduction is evaluated using various paper types under the controlled plate-preparing conditions, there would be a considerable difference between coated and uncoated paper. For example, when used uncoated paper, dot-gains from highlight to shadow area are observed on the whole, lowering the density in solid area. Whereas, in the case of coated paper, halftone dots tend to he reproduced closer to the reproduction curve of original plate.
For the purpose to see how the final print quality (dots reproduction) is affected by the properties of paper, a simulation has been made using data obtained from following items :
1) The relationship between surface properties of paper and printing ink.
2) An inference from ink absorption into paper and amounts of ink remained on the surface.
3) The relationship between brightness of paper and print reproduction. Finally, some troubles which might occur in printing operation are considered statistically on both sheet and web offsed process.View full abstractDownload PDF (11523K) -
1981 Volume 35 Issue 9 Pages 775
Published: September 01, 1981
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSDownload PDF (181K) -
Tokyo Mill, The Japan Paper Industry Co., Ltd.The Japan Paper Industry Co. Ltd.1981 Volume 35 Issue 9 Pages 776-782
Published: September 01, 1981
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThe Japan Paper Industry Co., Ltd.Tokyo Mill of The Japan Paper Industry Co., Ltd. was established in Kameari Tokyo, which started its operation in 1913.
This paper mill manufactures jute liner, core paper, color board, chip board, etc, with three cylinder machines, laminated board with a laminater and paper board box with die cutters.
The mill site area is about 93, 200 m2, and the employees are 270.View full abstractDownload PDF (10487K) -
Changes in Properties of Wood Pulp Fibres with RecyclingYoshio Yamagishi, Raysabro Oye1981 Volume 35 Issue 9 Pages 787-797
Published: September 01, 1981
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSCommercial dry sheets of hardwood and softwood bleached sulphate pulps and slush stock of hardwood and softwood unbleached sulphate pulps were beaten to about 350 ml C. s. f. by a TAPPI standard beater. These pulps were dewatered by centrifuge in a cotton cloth bag, shredded by hand dried in a forced air circulation drying oven at 80°C for 6 days. A sequence of wetting, defibrating, dewatering and drying was one cycle and this was repeated upto five times. After recycling, pulps were made into handsheets and tested. The following results have been obtained.
(1) Strength of handsheets, such as breaking length and folding endurance, decreased with recycling. However, tear strength of softwood pulps once increased with recycling, followed by a little decrease. Bulk and brightness of sheets increased.
(2) With recycling at the condition applied in this study, some decrease in viscosity or degree of polymerization of cellulose in recycle pulp fibres were observed. However, degradation of cellulose could hardly been detected from carbonyl and carboxyl contents in recycled fibres.
(3) Increments of crystallinity indices of recycled fibres by X-ray diffraction and acid hydrolysis by 1N HCl-EtOH were positively observed.
(4) According to measurments of water retention value (WRV), water swelling of recycled fibres decreased with recycling. Also Borruso's EWNN (Iron sodium tartarate) solubility, which was expressed as (PSr), that is, the concentration of free alkali which gives 10% higher EWNN solubility than 18% NaOH solubility, was measured on recycled beaten fibres. Changes in WRV and (PSr) B means some structural changes occured in recycled fibres. These changes coincided with decrease in amounts of polyethylene glycols of various molecular wei ghts of 200, 300, 400 and 600, retained in recycled fibres.View full abstractDownload PDF (1453K) -
Lam Thi Bach Tuyet, Atsushi Ishizu, Junzo Nakano1981 Volume 35 Issue 9 Pages 798-804
Published: September 01, 1981
Released on J-STAGE: January 29, 2010
JOURNAL FREE ACCESSSoftwood refiner mechanical pulp (RMP) was carboxymethylated according to the standard method. The carboxyl content of carboxymethylated RMP (CM-RMP) was almost equal to that of linter cellulose carboxymethylated under the same condition (Table 1). Nevertheless, the water-soluble fraction consisting exclusively of carbohydrates (Table 2) comprised only one third of CM-RMP or less than one-half of carbohydrates in RMP (Table 1).
The water-insoluble fraction has almost the same carboxyl content as the water-soluble fraction (Table 1), indicating that also carbohydrates in the water-insoluble fraction was highly carboxymethylated. In accordance with this result, hydrolysis of this fraction yielded non-carboxymethylated sugars in low yields (Table 2) and a complete delignification with chlorite made this fraction soluble into water (Fig. 2). Thus it may be concluded that lignin in RMP does not prevent the carboxymethylation of carbohydrates, but prevents the dissolution of carboxymethylated carbohydrates into water.
The content of carboxymethylated carbohydrates with low DP in the water-soluble fraction of CM-RMP could be determined by the use of g.p.c. (Fig. 3). The viscosity of the water-soluble fraction of CM-RMP was equal to about half the viscosity of a commercial CMC, because of contamination with hemicellulose.View full abstractDownload PDF (952K) -
Process System Approaches for Resources Recycling in Pulp and Paper Industries 5-th ReportHiromu Ohno, Fusao Yoshida, Iori Hashimoto, Suteaki Shioya, Takeichiro ...1981 Volume 35 Issue 9 Pages 805-815
Published: September 01, 1981
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESSThis 5-th report is concerned with making up a set of mathematical models of waste paper recycling system. The set of models has two exogenous variables (independent variables) which are the amount of paper production rate (103 ton/month) and pulp price (Yen/kg), and it will be used to estimate and forecast the amount of consumption and purchase of waste paper and its price.
In the first section, the model structure is identified by inspecting the economic aspect of waste paper market, and the model parameters are determined by using the monthly published data. In the second section, agreement between the calculated values and the published data is discussed quantitatively by using error mean square, coefficient of determination and Durbin-Watson ratio.View full abstractDownload PDF (1894K) -
[in Japanese]1981 Volume 35 Issue 9 Pages 816-822
Published: September 01, 1981
Released on J-STAGE: November 13, 2009
JOURNAL FREE ACCESS
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