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Volume 36, Issue 9
Displaying 1-8 of 8 articles from this issue
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Tetsuo Aoyagi, Hiroshi Asaoka1982 Volume 36 Issue 9 Pages 849-855
Published: September 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThe production of thermomechanical pulp (TMP) has been increasing in these several years for its physical properties. But it requires the largest amount of energy among the mechanical pulping methods, stone groundwood pulping, refiner mechanical pulping and thermomechanical pulping. So energy saving of thermomechanical pulping has become the most important problem to be solved. Observing the improvement of pulp strength by increasing the energy consumption, some researchers concluded that the good properties of TMP would be gained by giving excess of energy. In this paper the energy consumption of thermomechanical pulping and recent techniques in energy saving are reviewed and ways to approach the goal are mentioned from some standpoints including powder engineering.View full abstractDownload PDF (1199K) -
Masatoshi Kikuchi1982 Volume 36 Issue 9 Pages 856-860
Published: September 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSThere is a trend toward lighter weight newsprint.
Therefore, with the increased use of TMP the importance of brightness stability of TMP has remarkably increased.
Bleaching control system using digital controller, which takes into account pulp flow rate and time lag in bleaching tower, has been put into operation for sodium hydro-sulfite bleaching process of TMP from 1980.
It has been possible to get brightness stability of bleached pulp and reduction of bleaching chemicals.View full abstractDownload PDF (465K) -
Miyakojima Mill, Jujo Paper Co., Ltd.Jujo Paper Co. Ltd.1982 Volume 36 Issue 9 Pages 861-868_1
Published: September 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSMiyakojima mill of Jujo Paper Co., Ltd., which started its operation in 1913, is located at the northeast of Osaka City.
The mill, since its origin, has continued to produce various kinds of high grade specialty paper, most of which are light-weight, for example, cigarette paper, India paper, back carboncopying paper and glassine paper.
This mill has 5 paper machines and the monthly paper production is 2, 150 metric tons.
The mill site area is about 65, 000 m2 and the employees are about 400.View full abstractDownload PDF (1420K) -
Studies on lignin, part 124.Gyosuke Meshitsuka, Hidetsugu Furukubo, Shuji Hara, Junzo Nakano1982 Volume 36 Issue 9 Pages 869-874
Published: September 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSPreparation of functional resin from industrial lignins has long been studied for the better utilization of wood resources. However, because of their poor functionality and durability, those resins could not be compatible with commercial resins.
In this study, beads-like materials were prepared by acid treatment of spent sulfite liquor suspended in silicon oil. Beads-like materials thus prepared has an increased durability probably because of its spherical shapes and stability to aqueous alkaline solution.
Sulfonic acid group was introduced by sulfomethylation and fumic sulfuric acid treatment, but the number of sulfonic acid group introduced was at most about the half of the commercial ionexchange resins. It is necessary to develop a method for the more efficient sulfonation of beadslike materials.View full abstractDownload PDF (759K) -
Rice Straw SOX Pulp- (II)Akio Mita, Takashi Kobayashi, Takashi Saeki, Tokuo Yamamoto, Mitsuo Ka ...1982 Volume 36 Issue 9 Pages 875-886
Published: September 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSPulp prepared from the same lot of rice straw by the SOX process, the KP process, the RMP process, the NSSC process and the lime pulping process were compared for yield, strength etc. and an attempt was made to prepare improved hand sheets by blending SOX pulp prepared from rice straw (Rs-SOXP) with unbleached kraft pulp prepared from soft wood (N·U·KP).
The yield of the pulp abtained by the SOX process was exceedingly high, reaching 74. 1%, and the pulp was found to have relatively high strength for the high yield. On the other hand, the pulp yield for the KP process was low (3043%) and was difficult to raise above 60% even by carrying out mechanical defibration using a disk refiner. The yields obtained with the lime pulping process, the NSSC process and the RMP process were 64.5%, 51.7% and 62.0%, respectively.
Rs-SOXP-223, which was obtained at a yield of 59.7%, was found to have a breaking length of 3.29 km, a JIS burst factor of 1.56 and a tear factor of 32.8.
The Rs-KP pulps obtained at yields of 3040% had high strength but those obtained at higher yields were low in strength.
Rs-KP-101, which was obtained at a yield of 37.2%, had a breaking length of 7.54 km, a JIS burst factor of 4.92 and a tear factor of 53.2.
Blended hand sheets prepared from Rs-SOXP and N·U·KP showed a pronounced improvement in strength. For example, a blended hand sheet prepared with Rs-SOXP and N·U·KP blended at a ratio of 20 : 80 exceeded the JIS strength standards for a semichemical corrugating medium prepared from NSSCP and one prepared at a ratio of 40 : 60 exceeded the JIS strength standards for a kraft liner.
The paper and hardboard obtained from rice straw pulp in this way are likely to find a wide range of applications in the packaging field, particularly in connection with foodstuffs.View full abstractDownload PDF (2082K) -
Muneyoshi Tatsuda, Yohtaro Endo, Hitoshi Sotobayashi, Isao Iijima, Tok ...1982 Volume 36 Issue 9 Pages 887-908
Published: September 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSAt Ishinomaki mill, Jujo, a Bel-Baie II and a Duo-F are running for the production of telephone directory and LWC base stock respectively. Occasionally similar grades are made on the both formers giving us opportunities to make fair comparison between two machines. Both formers have their own advantages and disadvantages and there is no panacea. While Bel-Baie II can produce excellent sheet formation and surface strength, Duo-F can realize uniform ash and fine distribution in Z direction and relatively high first pass retention.
So far our experiences have proved sequential two way drainage is as effective as simultaneous two way drainage to modify some of the shortcomings of Fourdrinier. Recent development of simplified twin wire formers, such as Bel-Bond, Duo-H, Sym R, Dynaformer etc. look attractive for certain applications.
Twin wire formers should be selected according to specific end use of the paper produced. It seems there are still rooms for the further improvement of the operation and paper quality of the twin wire formers on the basis of operational expertise.View full abstractDownload PDF (4330K) -
J. P. E. Jones1982 Volume 36 Issue 9 Pages 909-912
Published: September 01, 1982
Released on J-STAGE: February 22, 2010
JOURNAL FREE ACCESSDownload PDF (462K) -
1982 Volume 36 Issue 9 Pages 918
Published: September 01, 1982
Released on J-STAGE: November 19, 2009
JOURNAL FREE ACCESSDownload PDF (106K)
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