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Volume 44, Issue 7
Displaying 1-8 of 8 articles from this issue
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Satoshi Kimura, Mitsuaki Kurita, Kaoru Kimura, Masayuki Horio2007 Volume 44 Issue 7 Pages 490-500
Published: July 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSHigh-quality and fine-grade (150-1200μm) foamed ceramic particles were prepared using a bubbling fluidized bed furnace of a pilot plant scale at residence times ranging between 300-1200s and bed temperatures above 1363K. The particle size lies in the intermediate size range between artificial lightweight aggregates (ALAs) for civil engineering and micro fillers.
Three bubbling fluidized bed furnaces (i. d.=40, 100 and 700mm) were developed for scale up research. Continuous semi-batch operation was achieved by elutriation separation of products from the fluidized bed of inert bed materials due to the difference in terminal velocities of particles. The accumulated temperature control method improved the uniformity in sintering from batch to batch operations and the error was in the order of 3 percent. At the pilot plant scale (i. d. 700mm), a production rate of over 150kg/h was achieved. The fluidized bed products showed comparable tensile strengh and Weible coefficient higher than the other products.View full abstractDownload PDF (2750K) -
Kouichi Nagata, Hiroyuki Takase2007 Volume 44 Issue 7 Pages 501-506
Published: July 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSInner stress of alumina green sheet was evaluated by using green sheets composed of alumina particles with surface areas of 2.0, 6.0 and 13.4m2/g. Suspensions were prepared by mixing alumina, solvent, plasticizer and acrylic polymer. Inner stress was calculated by measuring the camber of green sheet formed on PET film after drying. The camber was first observed at the last stage of the constant rate drying period. As the weight loss increased, the camber increased during the decreasing rate drying period. As the surface area of alumina increased, inner stress of green sheet increased at the same solid content of suspension. It was found that the inner stress is affected by the storage modules (G′), tan σ and the free polymers in the suspension.View full abstractDownload PDF (687K) -
Yoichi Tsuchida, Koichi Nakabayashi, Takayuki Suzuki, Tomohito Suzuki2007 Volume 44 Issue 7 Pages 507-522
Published: July 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper proposes two accurate continuous classifiers named FOF-WCW and FOF-CWC for a wet high-throughput centrifugal classification of a low particle-concentration slurry using an almost rigidly rotating flow produced between rigidly rotating housing and core walls (O and W represent feed and water supply; F and C represent fine and coarse products). Their classification performances have been proven to be superior to the conventional centrifuges through the numerical simulations of fluid and particle motions. The FOF-WCW which was developed by replacing an ineffective medium product (denoted by M) with water supply (W) in our previous FOF-MCM, is capable of conducting high-accuracy classification by preventing the fine particles from entering the coarse product. Also, the FOF-CWC made by exchanging positions of W and C in the above FOF-WCW, has the same high-accuracy in classification as that of the FOF-WCW.View full abstractDownload PDF (1894K) -
Yoichi Tsuchida, Koichi Nakabayashi, Takayuki Suzuki, Tomohito Suzuki2007 Volume 44 Issue 7 Pages 523-537
Published: July 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper proposes a new triple-product classifier named FOF-MCWCM for a wet-type high-throughput centrifugal classification of a low particle-concentration slurry using an almost rigidly rotating flow produced between rigidly rotating housing and core walls (O and W represent feed and water supply; F, M and C represent fine, medium and coarse products). The classification performance has been investigated by numerical simulations of fluid and particle motions and it is proven to be effective. This type is developed by dividing a collection part for C in our previous double-product FOF-CWC into two collection parts for M and C. A fine product F in the previous FOF-CWC is unchanged in this type, while a coarse product C in the former is divided into medium and coarse products, M and C, in the latter. The FOF-MCWCM successfully classifies the feed into three products (F, M and C).View full abstractDownload PDF (1761K) -
Michitaka Suzuki2007 Volume 44 Issue 7 Pages 538-545
Published: July 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSX-ray computed tomography is widely used for the observation of internal organs in medical diagnosis. Recently, X-ray micro computer tomography with a micrometer scale resolution has been developed and is now being applied in the field of engineering including powder and particle technology. X-ray micro CT can be used not only for the observation of internal structure of a particle or a powder bed but also for the quantitative measurement of a particle or powder packed bed characteristics. For example, the volume and the surface area of a particle can be calculated by integrating the cross sectional area and the perimeter of particle images captured by X-ray micro CT. Based on the measured volume and the surface area of a particle, we obtained the 3-dimensional particle shape factor such as Wadell's sphericity and the sphericity was compared with traditional 2-dimensional shape indices such as circularity. We also applied X-ray micro CT to the measurement of the void fraction distribution near the bottom of a spherical particle packing bed and the change in void fraction profils of a fine powder packed bed during the compression by a piston and a centrifugal force. Our experimental results showed that the local void fraction in fine powder packed bed increases with the depth of powder layer when compressed by a piston while it decreases with the depth of powder layer in the case of centrifugal packing. X-ray micro computed tomography is a new tool for powder characterization and will be widely used for various powder processes and powder product inspections in the near future.View full abstractDownload PDF (9338K) -
Precise Quantitative Analysis of Indomethacin Polymorphs Employing A Novel Sample Preparation MethodTakehiro Okumura2007 Volume 44 Issue 7 Pages 554
Published: July 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2106K) -
Hideya Nakamura2007 Volume 44 Issue 7 Pages 555-556
Published: July 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3901K) -
Satoru Watano2007 Volume 44 Issue 7 Pages 557
Published: July 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (121K)
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