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Volume 38, Issue 10
Displaying 1-8 of 8 articles from this issue
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Technology on kraft Pulp Bleaching with Chlorine (Part-I)Makoto Iwasaki1984 Volume 38 Issue 10 Pages 987-997
Published: October 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSIn this paper following articles are briefly reviewed.
1) Influence of closing bleach effluent on pulp strength and consumption of chemicals.
2) Technology which prevent the decrease in pulp viscosity from hot chlorination.
3) Review of the effluent free bleached kraft pulp mill.View full abstractDownload PDF (1696K) -
Views on production and qualityKjell Andersson, Hans Larsson1984 Volume 38 Issue 10 Pages 998-1002
Published: October 01, 1984
Released on J-STAGE: November 29, 2010
JOURNAL FREE ACCESSDownload PDF (757K) -
J. TAPPI Energy Conservation Committee, [in Japanese]1984 Volume 38 Issue 10 Pages 1003-1007
Published: October 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSPresent report sums up the 4 th survey conducted by the Committee concerning factors contributing to reduction in energy requirements achieved since the 1 st survey year (1978). The energy requirements for 1979, 1980, and 1981 were reported as an index (as set 100 for 1978). The answers have been collected from 75 mills (pulp, paper and paperboard) of 31 companies.
The summation indicates reduction in the energy requirements for the year 1981 by 15.7%(mean fig.) as compared to 1978. The figure is broken down according to the following factors;
1. Energy conservation investment 10.0%
2. Improved operational rate 2.4%
3. Optimization of fiber furnish 0.9%
4. Optimization of product grades or combination 0.6%
5. Environmental regulations -0.1%
6. Others 1.9%
Total 15.7%
Examples of certain practices of energy conservation will be further reported in some later issues of the journal.View full abstractDownload PDF (690K) -
Taiko Paper Mfg. Co., Ltd.Taiko Paper Mfg. Co. Ltd.1984 Volume 38 Issue 10 Pages 1008-1015
Published: October 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSTaiko Paper Mfg. Co., Ltd. was established in 1950, in Fuji City is located in south region of Mt. Fuji, the highest and the most elegant mountain in Japan. It is one of the integrated package paper mills products various papers from pulp. It has plants of kraft pulp, kraft paper and coated board paper.
Production Capacity of Pulp 265 t/D
Production Capacity of Papers 335 t/DView full abstractDownload PDF (3042K) -
1984 Volume 38 Issue 10 Pages 1032
Published: October 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (90K) -
Toshinori Ohtake, Makoto Usuda, Takashi Kadoya1984 Volume 38 Issue 10 Pages 1033-1039
Published: October 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe pore structure of thermomechanical pulp (TMP) handsheets and newsprints containing TMP was investigated by mercury porosimetry and IGT Penetration Volumeter which measures oil absorption rate into sheets.
TMP handsheets are more porous than chemical pulp handsheets, because of rigidity of TMP fibers. The pores of TMP handsheets formed by the rigid fiber network are usually filled with fine fractions. Total pore volume, defined as mercury penetration volume from 0.15 to 1000kg/cm2 pressure, decreses with increasing fine content of sheets. However decrease of pore volume levels off at about 50% fine content. The variation in pore structure of TMP handsheets due to fine content, does not always coincide with the changes in oil absorption rate.
The two-sidedness of pore structure of newsprints was obtained from sheet splitting method, and confirmed by the difference in oil absorption rate.
Therefore, it seems to be necessary for the evaluation of printability and coating aptitude of paper to develop a reasonable method of measuring the pore distribution along Z-direction of sheet.View full abstractDownload PDF (1860K) -
Hiroshi Ogawa1984 Volume 38 Issue 10 Pages 1040-1046
Published: October 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSAmong all the known processes for the acid saccharification of cellulose, such ones which make use of dilute sulfuric acid are the most feasible and, since the Scholler process first introduced, have continued to be employed even today. However, those processes have a difficulty such that they permit a secondary decomposition of glucose to take place as the saccharification reaction proceeds, whereby it is difficult to obtain an improvement in the yield of glucose.
With a view to increase the yield of glucose, there have been proposed a variety of processes. In case of these processes, however, the increase of the yield of glucose brings about the decrease of the concentration of glucose, and the production cost for the concentration of the glucose solution increases.
In view of the above, we have conducted a study on the economy in each of the variety of saccharification processes with dilute sulfuric acid comprising percolation process, plug flow process and counter current process, the studies being done by calculating the yield and the concentration of glucose at the time when a lowest saccharification cost was met in each of the processes. As a result, it was found that counter current process could attain a high value for both the yield and the concentration of glucose and thus came under the most economical process.View full abstractDownload PDF (991K) -
Properties of Holocellulose of Flax Bast FiberHiroshi Hara, Raysabro Oye1984 Volume 38 Issue 10 Pages 1047-1051
Published: October 01, 1984
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSHolocellulose of bast fiber in flax waste was hydrolyzed according to the following hydrolysis method, then negative-stained by uranyl acetate.
(1) 2.5 N HCl, 90°C for 10 hr
(2) 20% conc. H2SO4, boiling for 1 hr
The specimen was observed by an electron microscope. Dimensions of elementary fibril of holocellulose were measured from the micrographs, and it was recognized that average micell size was 35 to 40 A in width and 400 to 600 A in length.
A X-ray diffraction pattern at (002) and (040) plane of holocellulose of bast fiber in flax waste was measured by the reflection and transmittance method with Ni filtrated Cu-Ka. Each diffraction pattern was measured in the conditions, in which α was between 35°Kand 90°(at 5°Kintervals in Bragg angle) and β between 0°and 360°for (002) plane and α between 0°and 40°(at 5°intervals in Bragg angle) and β between 0°and 360°for (040) plane. Alpha was revolution angle on A axis in a face of specimen and, β was revolution angle perpendicular (B axis) to face of specimen.
Orientation and fibrillar angle were calculated using a polar figure and the relation between a and sin α·I. Orientation degree (A) was calculated by the angular width at halfmaximum intensity of α was 07deg;and β was between 0°and 360°for (040) and (002) plane.
It was recognized that microfibrils of flax fiber highly orientate with fibrillar angles between σ and 5 degree to the b axis of cellulose micell.View full abstractDownload PDF (1210K)
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