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Volume 29, Issue 2
Displaying 1-11 of 11 articles from this issue
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1975 Volume 29 Issue 2 Pages 43
Published: February 01, 1975
Released on J-STAGE: November 10, 2009
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Masashi Yoda1975 Volume 29 Issue 2 Pages 53-57
Published: February 01, 1975
Released on J-STAGE: November 10, 2009
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-A View for the Future by Analyzing Present Situation-Kahichi Nakamura1975 Volume 29 Issue 2 Pages 58-67
Published: February 01, 1975
Released on J-STAGE: November 10, 2009
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1975 Volume 29 Issue 2 Pages 68
Published: February 01, 1975
Released on J-STAGE: November 10, 2009
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1975 Volume 29 Issue 2 Pages 69-72
Published: February 01, 1975
Released on J-STAGE: November 10, 2009
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Masao Murata, Kyuzaburo Ishiguro, Akiharu Yokoyama1975 Volume 29 Issue 2 Pages 73-76
Published: February 01, 1975
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSIn the previous paper, the following results were proved, based on the newly proposed method of analysis on the paper making process. One is that the process concerning with basis weight variation consists of flow rate variation system and consistency variation system. The other is that Fourdrinier paper making machines are able to be classified roughly into three types : flow rate type, consistency type, and general type.
This paper is an extension of the above work and specifically investigates the factors of basis weight variation in general type.View full abstractDownload PDF (443K) -
-Qualities and Treatment of the Waste Liquors-Shen Chou, Masashi Sumimoto, Kokki Sakai, Tamio Kondo1975 Volume 29 Issue 2 Pages 77-83
Published: February 01, 1975
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSThe cooking properties and pulp qualities of magnesium-base semichemical pulps obtained by the four modified cooking methods, i. e (1) magnefite, (2) slurry [Mg(OH)2+Mg(HSO3)2], (3) high-yield sulfite, (4) two-component (SO2+MgSO4); were descrised in the previous report2) . In this paper, the vapor-phase magnefite cooking method of Shide wood (Carpinus sp.) is further examined and its cooking properties and pulp qualities compared with those of the other four procedures.
In the vapor-phase magnefite method, fewer chemicals were required for the delignification process than in the other four cooking methods. The lignin content in the vapor-phase pulps was about 16% (based on pulps yielded in 70%) which is smaller than that of the two-components, magnefite and slurry pulps. However, the brightness of unbleached vapor-phase pulps was lower than that of the other four pulps.
When the five different waste liquors were neutralized to pH 7, only the color of the waste liquor from the two-components method was especially dark, as shown in Fig.3. In the case of a pulp yield ranging from 65 to 70%, the COD values of the waste liquors from the five methods (based on 200g of oven dried wood) were very similar to each other, as shown in Table 4.
Treatment of the waste liquors for pollution alleviation was then performed with lime, active carbon and aluminum sulfate to remove color and COD from the waste liquors. Treatment with aluminum sulfate removed about 90% of the color and the lime treatment removed about 85%, though neither removed much COD. However, a high COD reduction accompanied by a lower color reduction was observed when using active carbon. The lower the pH of the waste liquor, the higher the degree of the color reduction observed, as shown in Fig. 4, but COD reduction in waste liquors with a lower pH is small, as shown in Fig. 6.View full abstractDownload PDF (1354K) -
Atsushi Sawatari, Toshitsugu Yamada, Tohjun Takashima1975 Volume 29 Issue 2 Pages 84-88
Published: February 01, 1975
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSIn regard to cellulose, the frequency dispersion of dielectric loss factor or dielectric loss tangent are generally observed at about -60°C over the range of frequency from 30Hz to 1MHz. According to Mikhailov et al1), 2) and Norimoto et al3), 5) , this dispersion is interpreted as the relaxation originated in CH2OH group of glucose residue in the amorphous region.
In this paper, triphenylmethylcellulose (tritylcellulose) were prepared with the various degree of substitution (D.S.). In order to confirm the above mentioned interpretation and further to find the dispersion change with the decrease of CH2OH group, the dispersion of the prepared tritylcellulose with various D.S. were measured at -59°C, from 300Hz to 300kHz. The same experiments were carried out for some cellulose acetates with various D.S. The following results were obtained in common between tritylcellulose and cellulose acetate :
i) With the increase of D.S., the height of the dispersion decreased.
The observed phenomenon suggests that the height of the dispersion is determined by the quantity of unsubstituted CH2OH group.
ii) The linear relation was observed between the height of the dispersion and the quantity of CH2OH group per specimen volume. Moreover, the slope of the straight line were almost equal for the two derivatives used. Therefore, the essential factor determined the height of the dispersion is considered to be quantity of CH2OH group per specimen volume.
From the results i) and ii), the relaxation mechanism of this dispersion is considered to be related to a motion of CH2OH group of glucose residue in the amorphous region.View full abstractDownload PDF (945K) -
1975 Volume 29 Issue 2 Pages e1a
Published: 1975
Released on J-STAGE: November 19, 2010
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1975 Volume 29 Issue 2 Pages e1b
Published: 1975
Released on J-STAGE: November 19, 2010
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1975 Volume 29 Issue 2 Pages e1c
Published: 1975
Released on J-STAGE: November 19, 2010
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