All issues
Volume 15, Issue 7
Displaying 1-9 of 9 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1961 Volume 15 Issue 7 Pages 436-437
Published: July 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (605K) -
[in Japanese]1961 Volume 15 Issue 7 Pages 438-441
Published: July 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (2724K) -
Hisaaki Toda, Tsuneaki Kijima1961 Volume 15 Issue 7 Pages 442-449
Published: July 10, 1961
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSRelationships were investigated among Sieber-, chlorine- (chlorine consumption in chlorination by Cl2-water at 0°C for 1 hr. or 20°C for 1/2 hr.) and permanganate numbers and lignin content of various unbleached pulps.
The pulps used were prepared from chips of fir, mixture of spruce and fir, birch and mixed hardwoods by sulfite and sulfate processes, ranging in unscreened yield from 46 to 80%.
Lignin content was determined by means of UV-absorptiometric method developed by Bethge for sulfite pulp and TAPPI Standard T222m-54 for sulfate pulp.
Results are summerized as follows :
1. Sieber number of the hardwood unbleached sulfite pulps is higher about 15-25% than that of softwood unbleached sulfite pulps at the same lignin content, permanganate number or chlorine number at 0°C (Fig. 2, 3, 5 and 6). Sieber number has, however, a linear relationship with lignin content, permanganate number and chlorine number (at 0°C for 1 hr.) in each wood sulfite pulp of Sieber number below 60.
2.Permanganate number has a linear relationship with lignin content (Fig. 4, 9 and 12) and chlorine number at 0°C (Fig. 7) in sulfite and sulfate pulps with lignin content below 18 %. Sulfite pulps are, however, slightly higher in chlorine number (at 0°C) and lignin content than those of sulfate pulps at the same permanganate number.
3. Chlorine number at 0°C for 1 hr. relates closely with lignin content for both sulfite and sulfate pulps with lignin content below 25 %. This chlorine number corresponds nearly to percentage of lignin in pulp irrespective of the wood species and cooking process (Fig. 8 and. 10).
4.Chlorine number at 20°C for 1/2 hr. has also straight line relationship with permanganate number, This chlorine number at 20°C gives, however, slightly higher value (0.5-0.7) than that at 0°C for 1 hr.in the case of sulfate pulps of chlorine number 4 to 8 (Fig. 11).View full abstractDownload PDF (1629K) -
The Manufacture of the 100% Nylon Paper on a Pilot Paper Machine by using N-methoxymethylated Nylon (type 8 nylon.)R. Maematsu, K. Ihara, S. Tani, K. Motoki, K. Kimura1961 Volume 15 Issue 7 Pages 450-456
Published: July 10, 1961
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSThe manufacture of the 100% nylon paper on a pilot fourdrinier and cylinder paper machine by using N-methoxymethylated nylon (type 8 nylon) as a bonding agent by the beater addition were studied.
The results are summarized as follows :
1) Type 8 nylon emulsion is to be effected readily by emulsifiers and the yield of resin is only 5% to additional quantity owing to resin trouble.
2) The yield of the particles made of type 8 nylon emulsion by alum is 20%
3) When tZype 8 nylon resin powder is dissolved to 70% methanol solution and thesize of particles are made 100μ by citric acid, the yield of resin can be improved.View full abstractDownload PDF (1568K) -
Katsumi Hata, Murao Sogo1961 Volume 15 Issue 7 Pages 457-460
Published: July 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSIn some small soda pulp plants which have no equipments to recover sodium hydroxide from the waste liquor, sodium sulfide is added to the soda cooking liquor to speed up the pulping reaction and to obtain a product of improved strength properties. We studied on using of powdered sulfur instead of sodium sulfide in such small plants in order to decrease the cost for pulping chemicals.
Wood chips fo P. densifiora were cooked with the sulfur-soda cooking liquors which were prepared by dissolving various amounts of powdered sulfur to the sodium hydroxide solutions, and the pulp yield, the lignin content of pulp, and the strengths of pulp were determined. In the case of using the cooking liquor containing sulfur of about 12% on the weight of sodium hydroxide, the pulping reaction proceeded most rapidly and the pulp obtained was as strong as sulfate pulp.
Wood chips were precooked with a solution of lime and sulfur at 100°C, and then cooked with a soda cooking liquor. By this method, the delignification reaction proceeded more easily.View full abstractDownload PDF (852K) -
Setsuzo Ota1961 Volume 15 Issue 7 Pages 461-466
Published: July 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (948K) -
Part 1. Influence on the Properties of Pulp and Paper Sheet by Changing the Beating Load or the Peripheral Speed of Beater RollNobuakira Fujinami, Takefumi Okamura1961 Volume 15 Issue 7 Pages 467-479,500
Published: July 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSUsing the laboratory Valley beater, the following results were obtained.
1) When the beating load was constant, the beating with the high peripheral speed of beater roll required the fairly lower freeness than it of the pulp beaten with the low peripheral speed of the roll to attain the constant ratio of tearing strength to bursting strength of paper sheet.
But in above case, each strength value was higher and the specific beating power was lower than in the case of beating with the low peripheral speed of beater roll.
2) In the manufacture of paper, whenever the highest strength properties of paper might be required, the beating degree was not the most reliable factor, but on the contrary the strength properties of paper should decide the beating degree.
3) It was not so desirable that all beating process was treated with the single condition of beating method, even if the method would be ideal.
In these experiments, it was found that the low peripheral speed of beater roll should be applied during the initial period of beating, the high peripheral speed of beater roll should be applied during the middle period of heating, and a second time the low peripheral speed of the roll should be applied for the final period of heating.
It should be examined the factors of beating actions except the peripheral speed of beater roll such as the type of heating equipment, consistency of pulp suspension and so on.View full abstractDownload PDF (4660K) -
[in Japanese]1961 Volume 15 Issue 7 Pages 480-484,497
Published: July 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (1021K) -
Von Karl Kratzl1961 Volume 15 Issue 7 Pages 485-494
Published: July 10, 1961
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSDownload PDF (1000K)
- |<
- <
- 1
- >
- >|