Method for monitoring and/or controlling a granulation, coating and drying process
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United States of America Patent
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May 7, 2002
Issued Date -
N/A
app pub date -
Sep 24, 1999
filing date -
Mar 27, 1997
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Expired
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Abstract
A method and a device function for monitoring and/or controlling and regulating a granulation, agglomeration, instantization, coating and drying process in a fluidized layer or a moving bulk by determining the product moisture. At least during one process segment the total product moisture is measured substantially continuously over a period of seconds, in a contact-free manner using electromagnetic radiation in the high frequency or microwave range, by evaluation of the attenuation of the radiation as a measure of this total product moisture. Taking into account the product temperature, the measurement result is used to hold the total product moisture in a pre-determined range via a control circuit by changing the spray rate and/or the gas temperature and/or the volume flow.
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