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Volume 33, Issue 4
Displaying 1-12 of 12 articles from this issue
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Kyuzabro Ishiguro1979 Volume 33 Issue 4 Pages 227-236
Published: April 01, 1979
Released on J-STAGE: January 22, 2010
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Masao Murata1979 Volume 33 Issue 4 Pages 237-242
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
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Koji Murakami1979 Volume 33 Issue 4 Pages 243-249
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
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Takashi Kadoya1979 Volume 33 Issue 4 Pages 250-259
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
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Kouzo Tsuchida1979 Volume 33 Issue 4 Pages 260-271
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
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Shinji Matsuda1979 Volume 33 Issue 4 Pages 272-280
Published: April 01, 1979
Released on J-STAGE: January 22, 2010
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-Suzukawa Mill, Daishowa Paper Mfg.Co., Ltd.-Daishowa Paper Mfg.1979 Volume 33 Issue 4 Pages 281-290_1
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
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Handwriting Paper of TottoriSeishi Machida1979 Volume 33 Issue 4 Pages 291-293
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
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1979 Volume 33 Issue 4 Pages 294
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
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Yoshio Tarui, Takeshi Shinomiya, Saburo Kugo, Takashi Yoshida, Shuji E ...1979 Volume 33 Issue 4 Pages 295-301
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSAn important feature of the production process of the active carbon from the hark (yezo spruce, Picea jezoensis) is the step of the carbonization. Before heating a small quantity of phosphoric acid (for example, 5% per the bark) was added to the bark. The yield of the char with phosphoric acid was higher than that without the acid and it was supposed that a structure of the char with phosphoric acid might be suitable for the activation with steam.
Consequently the pellet from the char was easily activated, and the activated carbon produced with higher yield had greater adsorptive power in both methylen-blue test and soy test. These researches were made on each step such as the carbonization of the bark, the pelletizing of the char, and the activation of the pellet with steam, and these installations were scaled up with the progress of the study. Finally studied using these pilot scale reactors, it was supposed that the spherical active carbon from the bark was possible to produce commercially.
This paper describes the researches in (1) the effective agents to enable the improvement of the yield and the adsorbability of the char after the carbonization of the bark, (2) the effect of the agent in the activation, and (3) the suitable quantity of the agent treated the hark.
It is considered that these effects of phosphoric acid added to the bark are due to (a) the quantitative improvement in the yield of the char and the active carbon, and (b) the efficient activation of the char.View full abstractDownload PDF (1079K) -
Effect of Various Factors on StiffnessMasataka Oda, Takashi Kadoya, Makoto Usuda, Minoru Kimura1979 Volume 33 Issue 4 Pages 302-308
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSAccording to the results of report no. 1 in this series, stiffness of paper can be predicted from the equation of ET3/12 W, if the thickness obtained from mercury buoyancy method is adopted as T, and sonic modulus adopted as E (W : basis weight).
Paper is generally produced in various ways and used under various conditions. Stiffness of paper is, therefore, influenced by a number of factors. Effect of various factors, i. e., kinds of pulp, beating, wet pressing, wet straining, addition of filler, and relative humidity, on stiffness of paper were examined in this study. These factors were mainly analyzed using eq. (1).
Results obtained are as follow.
(1) The order of Clark's stiffness is RGP > LBKP > NBKP, when pulp sheets were made according to the process of JIS P 8209 (wet press : 3.5 kg/cm2). This seems to be due to the difference of thickness among them.
On the other hand, the order of stiffness is NBKP > LBKP > RGP, when the sheets possess the same thickness by controlling wet pressing. Main reason for this result seems to be caused by the difference of sonic modulus.
(2) Stiffness may be increased under the suitable preparing condition, which includes degree of beating, wet pressing, wet straining, and addition of filler.
When sheet was made by the condition of constant wet pressing 3.5 kg/cm2, stiffness of paper decreased with increasing in degree of beating. The result indicates that in this condition, thickness of paper is the most important factor on stiffness.
(3) In the case that thickness of paper was varied by changing wet pressing of the samples which possessed the same basis weight and same f reeness, sonic velocity did not depend on paper thickness (density), and in these conditions, stiffnss was proportional to second power of thickness.
(4) Stiffness decreased rapidly at higher than 70% RH, the value at 90% RH, for example, is almost half of that at lower than 50% RH.View full abstractDownload PDF (1117K) -
1979 Volume 33 Issue 4 Pages Preface1-Preface5
Published: April 01, 1979
Released on J-STAGE: November 10, 2009
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