Measuring and testing – Particle size
Patent
1998-04-15
1999-11-30
Raevis, Robert
Measuring and testing
Particle size
G01N 3100
Patent
active
059922451
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a particle measurement device for a powder or granular material processing apparatus, and in particular, to techniques effectively applicable to a grain size measurement device which actually and continuously measures grain sizes, shapes, and the like of powder or granular material produced by various powder or granular material processing apparatuses such as a fluidized bed granulator apparatus, an agitation granulator, a centrifugal tumbling granulating/coating apparatus.
BACKGROUND ART
There are various processings of powder or granular material, including granulating, drying, coating, and the like. Among them, as the granulating method of powder or granular material, can be listed the fluidized bed granulating method, agitation granulating method, centrifugal tumbling granulating method, and combinations thereof or combined-type granulating methods, and they are widely employed in various fields such as pharmaceutical preparations and food.
At first, among these granulating methods, the fluidized bed granulating method comprises sprinkling liquid material on powder or granular material, which has been in a fluidized state by dispersion and mixing within a processing vessel, increasing the grain sizes gradually. As a fluidized bed granulating apparatus for such processing, may be mentioned Flow Coater (trade name) by Freund Industrial Co., Ltd. which fundamentally comprises a processing vessel for containing and processing material to be processed, a fluidizing air supply device for supplying fluidizing air so as to fluidize the material, and a spray nozzle for spraying liquid on the material. By the fluidizing air, the material to be processed comes to be fluidized, and on this fluidized material, the liquid is sprayed by the spray nozzle, to carry out the granulation.
Next, the agitation granulating method comprises dispersing and mixing solid/liquid to produce particles, by agitation with an agitating blade (agitator). As an agitation granulating apparatus for such processing, be mentioned a high speed mixer FS-G model (trade name) of Fukae Kogyo Ltd., which is called, in another name, as a high speed mixing machine. As disclosed in Japanese Patent Publication No. 6-22667, Japanese Patent Publication No. 6-24619, Japanese Un-examined Patent Laid-Open No. 5-236, and Japanese Patent Publication No. 2-32932, this agitating granulating apparatus fundamentally comprises an agitating blade rotatably provided within a processing vessel, with a bottom portion of the processing vessel serving as a fixed wall. In addition to this construction, a disintegrating blade (chopper) may be provided if necessary, as shown in Japanese Un-examined Patent Laid-Open No. 5-115766, so that disintegration granulation may be performed by the chopper, in addition to tumbling granulation by the agitator. Further, if a drying process is needed, a vacuum drying system may be provided, or otherwise, a heater may be provided on the outer periphery of the processing vessel in a jacketing manner. Then, by suitably controlling rotational speed of the agitator and the chopper, quantity of the liquid, quantity of charging, granulation time, temperature, and the like, mixing granulation of the powder or granular material is carried out.
On the other hand, the centrifugal tumbling method comprises tumbling mixing of powder material on a rotating disk, while spraying liquid on the material to make powder particles adhere to and agglomerate with one another. As a centrifugal tumbling granulating apparatus for such processing, be mentioned CF Granulator (trade name) made by Freund Industrial Co., Ltd., an automatic coating apparatus described in Japanese Patent Publication No. 54-992, and a granulating apparatus of Japanese Un-examined Patent Laid-Open No. 6-262054 (corresponding to U.S. Pat. No. 5,507, 871), and each of these apparatus fundamentally comprises a rotating disk, which rotates generally horizontally, provided at a bottom portion of a processing vessel. If necessary, slit air
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Isobe Shigemi
Takei Narimichi
Yamanaka Kuniaki
Freund Industrial Co. Ltd.
Raevis Robert
Shionogi & Co. Ltd.
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