All issues
Volume 26, Issue 7
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1972 Volume 26 Issue 7 Pages 41-43
Published: July 01, 1972
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSDownload PDF (625K) -
1972 Volume 26 Issue 7 Pages 55-56
Published: July 01, 1972
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSDownload PDF (1566K) -
Yoshio Hori1972 Volume 26 Issue 7 Pages 345-347
Published: July 01, 1972
Released on J-STAGE: January 22, 2010
JOURNAL FREE ACCESSDownload PDF (1117K) -
Kyosti V. Sarkanen, Bjorn F. Hrutfiord, Lennart N. Johanson, Howard S. ...1972 Volume 26 Issue 7 Pages 348-354
Published: July 01, 1972
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSDownload PDF (1190K) -
Kozo Tsuchida, Takeji Inadome, Takashi Kadoya1972 Volume 26 Issue 7 Pages 355-362
Published: July 01, 1972
Released on J-STAGE: May 07, 2010
JOURNAL FREE ACCESSThe theoritical correlation of CSF value and continuous freeness recorder's value are considered.
CSF values, which is the drainage volume from side orifice of CSF tester, is represented by next equation.
CSF=Q2/VbKr+Q+VbKr (lnVbKr/VbKr+Q+Q/VbKr+Q)-qb
where,
Kr=RWηQC1/ρgS
From this equation, if Q, Vb, qb are known values, CSF value is function of Kγ which is decided by RW.
At the continuous freeness recorders, assuming that there is a discontinuous change in the concentration of the pulp mat under the wire screen from that of the surrounding slurry, we will obtain the following equation. (See Fig. 7)
h2_??_2ρgh0/RWη, (1-αC1)(C2-C1)/C1C2t
This equation means that the correlation of h2 and t depend on the RW value.
As a result, CSF value and continuous freeness recorder's value are represented by same physical value RW or Kγ.View full abstractDownload PDF (1329K) -
Raysaburo Ohe, Tadao Mizuno1972 Volume 26 Issue 7 Pages 363-371
Published: July 01, 1972
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSComparing the behaviour of bamboo meal at prehydrolysis sulfate cooking with those of wood meals from fir and beech, the following results were obtained : (1) The order of the rates of yield loss at prehydrolysis was; beach>fir>bamboo. Delignification rates of bamboo and beech were nearly similar. The removals of pentsan at the same level of yield loss were coincident for three samples. Bamboo differed from wood meals in the lignin content, which did not increase during prehydrolysis. (2) Bamboo lignin was more alkali soluble. By alkali extractions, increases of solvent extracts during prehydrolysis were prevented for three samples. It would not simply be concluded from the above results that pentosan had a protection effect for inactivation of lignin during prehydrolysis. (3) Although bamboo was richer in lignin than beech, it could be cooked so easily by sulfate process as beech. (4) Softwood was rendered difficult by prehydrolysis for a succeeding sulfate cooking. On the contrary, bamboo and hardwood became rather easier. (5) Reactivities with phologlucin of bamboo and hardwood were considerably deteriorated due to prehydrolysis. This was caused by the influence of the considerable amount of decomposed substance from pentosan by prehydrolysis. Such substances supposedly prevented lignin from inactivation at cooking. It was concluded that bamboo showed the behaviour of hardwood-type at prehydrolysis and sulfate cooking, not of softwood-type, though bamboo contained more lignin than hardwood. It ha sbeen proved that sulfate cooking of bamboo was not hindered by advanced prehydrolysis.View full abstractDownload PDF (1196K) -
6 Explosions from April to October 1971Akio Isshiki, Hideo Sakamoto1972 Volume 26 Issue 7 Pages 372-378
Published: July 01, 1972
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSDownload PDF (1625K) -
Kotohiko Yamamoto1972 Volume 26 Issue 7 Pages 379-384
Published: July 01, 1972
Released on J-STAGE: November 10, 2009
JOURNAL FREE ACCESSDownload PDF (882K)
- |<
- <
- 1
- >
- >|