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Volume 17, Issue 11
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1963 Volume 17 Issue 11 Pages 692-697
Published: November 20, 1963
Released on J-STAGE: November 10, 2009
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[in Japanese], [in Japanese], [in Japanese]1963 Volume 17 Issue 11 Pages 698-706
Published: November 20, 1963
Released on J-STAGE: November 10, 2009
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A Change in Quality of Handmade Paper in High TemperatureHaruji Kato, Hiroshi Ishikawa1963 Volume 17 Issue 11 Pages 707-711
Published: November 20, 1963
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSWe examined a change in quality of a handmade paper when we exposed it in high temperature for a long hours. The result of it was as follows : In the first time, We exposed the paper in the temperature of 75°C for about 50 hours, but little changes appeared on it's colour. Next, I exposed it again for 50 hours more in 100°C at this time, then the paper coloured badly and become weakend.
The limitation of the temperature in which handmade paper still can be fit for use is 75°C, and we must consider that a paper have a bad effect to it's utility after exposing it in high temperature.View full abstractDownload PDF (581K) -
The Preparation Methods of Polysulfiede Liquors and the Alkaline Cooking with the Addition of PolysulfidesGoro Toga, Tadashi Nishi, Saisei Miyao1963 Volume 17 Issue 11 Pages 712-716,711
Published: November 20, 1963
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSThis work relates to the manufacture of chemical pulp and in particular is concerned with the improvement of pulp yield in alkaline pulping process by the addition of sodium polysulfides.
The polysulfide liquors are prepared by the reaction of various alkaline aqueous solutions such as sodium sulfide, kraft white liquor and caustic soda with powdered sulfur.
The most profitable method is to react sodium sulfide with sulfur in aqueous solution, and it have been shown experimentally to produce polysulfides without any losses of soda and sulfur. In the case of using kraft white liquor and caustic soda however, it was recognized that the percentage of polysulfide produced was approximately 60% based on Na2O in alkaline solution because of the formation of sodium thiosulfate.
The stability and hydrolysis of polysulfide liquors are also discussed in this paper.
In the cooking experiments, Japanese red pine (pinus densiflora) wood chips were pulped by use of alkaline cooking liquors with various amounts and several types of polysulfide under the cooking condition of conventional kraft process.
For comparison purposes, the same supply of wood was pulped to a similar Roe No. level using an kraft white liquor.
The presence of polysulfides in alkaline cooking liquor was found to increase the screened yield by about 1.2 to 2.4% according to the amounts of polysulfide sulfur 1.8 to 8.5% added on wood chips.View full abstractDownload PDF (1071K) -
On the Paper MachineT. Kadoya, T. Niwa, S. Mizuko1963 Volume 17 Issue 11 Pages 717-722
Published: November 20, 1963
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSIn planning to mechanize a paper flaw electing process which is solely done by a primitive process depending on the human eyes at present, we made various experiments about the possibility of paper flaw detection by various detecting systems.
As a result, we adopted the scanning system resort to the flying image method and built a prototype of this.
By using this type, we carried out experiments of detection for various paper defects and found the protype apparatus to work satisfactorily in fast moving paper.
This paper describes in detail above experiments and their results.View full abstractDownload PDF (1139K) -
Bleaching of Pulps Prepared by the Kraft Digestion of Sulfite Knotter RejectsTadashi Shogenji, Akio Mita1963 Volume 17 Issue 11 Pages 723-728,735
Published: November 20, 1963
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSUnbleached pulps prepared by the kraft digestion of sulfite knotter rejects were bleached by two multiple-stage methods. One method (I) consisted of chlorination, alkali extraction, and hypochlorite oxdition stages; the other method (II) consisted of hypochlorite oxidation, chorination, alkali extraction, and hypochlorite oxidation stages. The bleached pulps were then tested for chemical and physical properties. In general, these bleached pulps were of high purity and showed a high degree of brightness. The alpha-cellulose content was from 85 to 95%. The pulps bleached by Method I were somewhat inferior in brightness to the pulps bleached by Method II, but had a greater alpha-cellulose content than the latter pulps. From the data for alpha-cellulose content and other data obtained by additional experiments, it is considered that the pulps bleached by Method I can be used for making various grades of paper.View full abstractDownload PDF (1462K) -
[in Japanese]1963 Volume 17 Issue 11 Pages 729-735
Published: November 20, 1963
Released on J-STAGE: November 10, 2009
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[in Japanese]1963 Volume 17 Issue 11 Pages 736-737
Published: November 20, 1963
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSDownload PDF (368K)
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