CLASSIFICATION OF HOLLOW PARTICLES AND SURFACE CLEANING

PURPOSE:To minimize the irregularities of grain size and specific gravity and remove damaged hollow particles by further classifying hollow particles consisting of quartz glass classified by using a specific gravity classification technique after the classification of the particles with an air class...

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Bibliographic Details
Main Authors YOKOUCHI KISHIO, KAMEZAKI HIROSHI
Format Patent
LanguageEnglish
Published 09.02.1993
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Summary:PURPOSE:To minimize the irregularities of grain size and specific gravity and remove damaged hollow particles by further classifying hollow particles consisting of quartz glass classified by using a specific gravity classification technique after the classification of the particles with an air classification technique. CONSTITUTION:Particles of micro-diameter which are present in a mixed state with hollow particles are of an insufficiently foamed grade and a damaged grade so that their specific gravity is high. Therefore, such particles are classified using an air classification technique, and then the particles thus classified are further classified using a specific gravity classification technique by which it enables to classify by the degree of specific gravity. Subsequently, these particles of micro-diameter can be cut to the specified grain size. Therefore, it is possible to obtain hollow particles of uniform grain size and specific gravity, and if a multi-layer ceramic circuit substrate is formed, a multi-layer ceramic circuit substrate which demonstrates a low dielectric constant which influences on the propagation properties of signal and minimized irregularities of dielectric constant and mechanical strength can be stably obtained.
Bibliography:Application Number: JP19910190055