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Volume 24, Issue 9
Displaying 1-11 of 11 articles from this issue
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Akio KATO1987 Volume 24 Issue 9 Pages 570
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
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Guosheng GAI1987 Volume 24 Issue 9 Pages 571-574
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this experiment, a Horizontal Vibrating Disk Mill was tested. The test involved the fine grinding of brittle materials, especially for the production of CWS. The experiment was carried out in the laboratory using coal, limestone and cement clinkers. It was found that (1) the energy consumption of this mill was lower than that of a ball mill, (2) the product size was more uniform, (3) by using ceramics as the material for the tiles and the wheel, there was no ferritic element added to the ground material, (4) the feed rate and feed size greatly influenced the capacity of the mill, often causing over feeding, and (5) much more research is needed in order to complete the mill.View full abstractDownload PDF (428K) -
Masanori NAGATA, Yukio HONDA, Shigeyuki MORI, Junichi KAWAGUCHI, Hideh ...1987 Volume 24 Issue 9 Pages 575-581
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper deals mainly with the particle size distribution of pottery clays on the market and the ways of grinding using Amakusa pottery stones which are raw materials for Arita porcelain.
The conclusions obtained are summarized as follows:
1. It is elucidated from a statistical analysis that the pottery clays on the market being prepared by stamp mill grinding and elutriation have particle size distributions obeying the Gaudin-Schuhmann distribution, irrespective of whether they are pottery clays for throwing or casting.
2. A new grinding system is proposed in which a pottery stone is ground by a roller mill and successively by a stamp mill for a period of 90 minutes. It is found that a pottery powder prepared using such a method has almost the same properties as pottery clays on the market with respect to particle size distribution and mineral composition and also has enough of the properties needed to actually make Arita porcelain.View full abstractDownload PDF (889K) -
Noriyuki YAMADA, Hideharu HIROSUE, Eiichi ABE1987 Volume 24 Issue 9 Pages 582-587
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA slurry feed composed of water, PVA and fine particles are sprayed in droplet form into a spray dryer, and the porous and spherical spray-dried products are recovered. However, the PVA binder is so hygroscopic that the strength of the products changes with relative humidity.
For the purpose of clarifying this phenomenon quantitatively, the specific surface area, hygroscopic moisture content and strength of the spray-dried products are examined experimentally and theoretically.
The conclusions obtained are summarized as follows:
1. The hygroscopic moisture content of the products is estimated by the total of the moisture adsorbed on the surface of constituent fine particles covered somewhat with PVA and the moisture adsorbed by PVA itself.
2. The strength of the products is measured under various conditions of relative humidity. The measured values are compared with the results calculated from the previously derived equation. As a result, it is found that the strength of the products can be estimated well by taking account the effect of the variation in humidity on binder strength in the derived equation.View full abstractDownload PDF (1867K) -
Yu-Jun HAO, Tatsuo TANAKA1987 Volume 24 Issue 9 Pages 588-592
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe Jander model has been widely applied to the analysis of solid-solid reaction rates. However, it contains some problems which contradict Jander's own experimental work. In this paper, the main problem, i. e, the variation of the rate constant with the molar ratio is explained by the number of contact points between different kind of particles. Furthermore, various mistakes are also pointed out in the so-far published reaction models, anticipating that a new reaction model be proposed by introducing the correct number of contact points.View full abstractDownload PDF (552K) -
1987 Volume 24 Issue 9 Pages 592
Published: 1987
Released on J-STAGE: April 30, 2010
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Hirotaka HONDA, Kenji ONO, Takafumi ISHIZAKA, Takashi MATSUNO, Toshio ...1987 Volume 24 Issue 9 Pages 593-599
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis study deals with the mechanochemical powder surface modification method. This method is a high speed impact treatment method utilizing order mixing. In the method, fine particles are first made to adhere to the surface of a core particle by static electricity, and then the surface interaction between particles is strengthened by applying physical force.
Nylon 12 powder as core particles was mixed with fine particles, such as poly-methyl-methacrylate (PMMA) and titanium dioxide as wall materials.
In the PMMA/nylon 12 system, it is found by SEM observation that many fine PMMA particles are softened and melted coating each core nylon 12 particle. On the other hand, in the titanium dioxide/nylon 12 system, from the results observed by liquid penetrating a composite powder bed, contact angle measurement, X-ray analysis, and SEM observation, it is mainly found that titanium dioxide particles are homogeneously fixed onto the surface of each core particle.View full abstractDownload PDF (3917K) -
Yoshiaki KAWASHIMA, Toshiyuki NIWA, Tetsurou HANDA, Hirofumi TAKEUCHI1987 Volume 24 Issue 9 Pages 600-603
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe crystals of pharmaceuticals, e. g. ibuprofen and ketoprofen, were directly modified during the crystallization process with acrylic polymer (Eudragit®) using a novel spherical crystallization technique. The resultant crystals were microspheres agglomerated with the polymer, which were highly flowable and compressible. The drug release rate from the microspheres was pH-dependent and controlled quantitatively by the type and the amount of the polymer employed. In addition, the microspheres improved the bioavailability of the drug in dogs.View full abstractDownload PDF (1987K) -
[in Japanese], [in Japanese], [in Japanese]1987 Volume 24 Issue 9 Pages 604
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (108K) -
Hideo TORAYA1987 Volume 24 Issue 9 Pages 605-611
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (855K) -
Minoru KURODA1987 Volume 24 Issue 9 Pages 612-614
Published: September 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1422K)
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