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Volume 34, Issue 5
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[in Japanese]1980 Volume 34 Issue 5 Pages 59-61
Published: May 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESS -
1980 Volume 34 Issue 5 Pages 62
Published: May 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSDownload PDF (111K) -
Makoto Usuda1980 Volume 34 Issue 5 Pages 327-334
Published: May 01, 1980
Released on J-STAGE: November 16, 2009
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Ryouhei Kimura1980 Volume 34 Issue 5 Pages 335-339
Published: May 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe fluidized bed incineration plant has been installed at Katsuta Mill for burning the total quantity of sludges generated.
This plant consists of a fluidized bed incinerator and a rotary dryer. The key point of this system is the savings of energy or fuel oil use.
It has been on stream from May 1979, and now under satisfactory conditions. Autogeneous incineration has been achieved.View full abstractDownload PDF (726K) -
Harada Mill, Mishima Paper Co., Ltd.Mishima Paper Co. Ltd.1980 Volume 34 Issue 5 Pages 340-348_1
Published: May 01, 1980
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSMishima Paper Co., established in 1918, is now composed of a head office (Tokyo), two mills (Harada and Suita) and a research institute.
Harada Mill, which we are going to introduce here, is on the outskirts of Fuji City well-known for its fine view of national adoring mountain, and the other is in Suita City where the world famous EXPO 70 was once held.
In and around Harada district, people have been long blessed with an abundance of clean spring water, and that is why our predecessors first had a thought of founding there a mill for the purpose of manufacturing cigarette-paper more than 60 years ago …… unknown technology as it was in those days. Ever since Harada Mill has continued to produce various kinds of high grade paper, most of which are light-weight, to enrich daily life or expedite business, and now holds the paramount position in the field of making specialty paper.
The mill area is about 100, 000m2 and the employees are nearly 450. The main products are as follows :
For cigarette use …… cigarette-paper, tipping or wrapping paper, etc.
For business use ………… copying, typing, bond, instruction or contract, pocket note-book, etc.
For other special use …… India used to dictionary, water dissolving, various kinds of converted paper, etc.View full abstractDownload PDF (17278K) -
Studies on Lignin No. 110Gyosuke Meshitsuka, Junzo Nakano1980 Volume 34 Issue 5 Pages 349-355
Published: May 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSIn order to develop a new process for the preparation of a water soluble kraft lignin, sulfonation mechanism of lignin model compounds by oxidizing reagents-sulfite system and its applicability to the sulfonation of kraft lignin were investigated. Among the lignin structural units, a catecholic structure was turned out to be most reactive to this sulfonation reaction. A guaiacyl structure without α-carbonyl group showed much higher reactivity than that of a guaiacyl structure withα-carbonyl group. Kraft lignin was totally water solubilized by this sulfonation reaction, regardless the kind of oxidizing reagent, such as MnO2, KMnO4, K2Cr2O7 and K3Fe (CN) 6.View full abstractDownload PDF (674K) -
Narn Seok Cho, Junzo Nakano, Tadashi Iwamida, Yuichiro Sumi1980 Volume 34 Issue 5 Pages 356-366
Published: May 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSNeutral sulfite precooked birch chips were refined in the Asplund Laboratory Defibrator (type D) at various temperatures (20°C, 120°C and 180°C). The effects of refining temperatures on the physical property and morphological structure of the resulting pulps were discussed.
The effect of refining temperature on the sheet property depends largely on the precooked yield. Regardless of any refining temperatures, unbeaten pulp fiber prepared from precooked chip of 84% yield was a little peeled off by partial fibrillation rather than intercellular cutting. The secondary wall and the compound middle lamella were observed on its surface at same time. There was recognized no distinct difference in fiber length distribution and its morphological structure between unbeaten and beaten pulps. At same sheet density, pulp from open discharge refining had better sheet strength as compared to pressurized refining, because pulp from the former had much amounts of fines with higher water retention value than the latter.
In the case of pulp prepared from precooked chip of higer yield (94%), refining temperature affected remarkably fiber length distribution and surface characteristic of pulps. Pulp fiber refined at 20°C was damaged heavily, and its surface was mainly covered by the secondary wall. On the other hand, fiber surface produced at pressurized refining was smooth and covered by the compound middle lamella. Sheet strength increased linearly as sheet density increased, regardless of any refining temperatures.
It would be concluded that the sheet strength of higher precooked yield (94%) pulp depends only on sheet density, while that of lower precooked yield (84%) pulp on the property and content of fines in addition to sheet density. Exposure of the secondary wall on fiber surface had no relation to the sheet strength directly.View full abstractDownload PDF (7460K) -
Theoretical ConsiderationShigeyoshi Osaki, Yoshihiko Fujii, Noritsuka Kiichi1980 Volume 34 Issue 5 Pages 367-374
Published: May 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe present paper deals with the theoretical consideration on the relations between sheet density, pressure, and Z-direction compressive modulus of paper. It is assumed that paper as a non-homogeneous substance consists of voids and pulp fibers which are distributed homogeneously. A new concept of total interfiber contact area, on which stress effectively acts, under compressed conditions can be introduced into the relation between sheet density and pressure. The total interfiber contact area is expressed by the product of the number of contact points between pulp fibers per unit volume, and the mean contact area at a contact point. When the pressure applied to a sheet is low, the voids are reduced while the pulp fibers are not deformed : the number of contact points increases with increasing pressure while the mean area of contact does not change. When the compressive pressure applied to a sheet is high, the pulp fibers are deformed : the number of contact points shows a saturated value while the mean contact area increases with increasing pressure. On the assumption mentioned above, the relations between applied pressure, sheet density, and Z-direction compressive modulus were derived theoretically. A correlation between the theoretical and experimental results on the handmade papers was satisfactory over a wide range of pressure.View full abstractDownload PDF (3374K) -
Linerboard Technical Committee1980 Volume 34 Issue 5 Pages 375-384
Published: May 01, 1980
Released on J-STAGE: November 16, 2009
JOURNAL FREE ACCESSThe compressive strength (ring crush) of paperboard is an important property to estimate the compressibility of box and therefore the ring crush in cross direction has been specified in the Japanese Industrial Standard of linerboard and corrugating medium. At present, compression testing apparatus by beam type are generally used to measure ring crush strength, however, this method has been a subject of discussion for a long time because of their instrumental errors of more than 10 percent.
Under the circumstances, the Linerboard Technical Committee of Japan Paper Association studied the factors of these errors, making comparison of the data obtained with the use of the beam type and strain gauge type of apparatus The result was that among many factors the level of parallelling of the upper and lower compression platens with each other had a most significant effect on the errors. As for the strain gruge type of apparatus we used, they turned out to be poorer in preciseness than well-cared beam type ones. The reason seems to be that we used the type mainly designed for measuring tensile strength. However, it is considered that a strain gauge type is essentially superior to a beam type in terms of instrumental precision. We expect that a special type of strain gauge testing apparatus will be developed to measure the ring crush.View full abstractDownload PDF (1088K)
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