| 摘要 |
PROBLEM TO BE SOLVED: To produce micropowder having an extremely sharp grain size distribution as a spacer for liquid crystal display at an industrial level by passing microgranular materials through a sieve having apertures of an average aperture diameter of a specific value range to sieve the microgranular materials, thereby obtaining the microgranular materials of a specific value or below in the content of the particles having the grain size of >=2 times the average grain size. SOLUTION: The air flow dispersed with the microgranular materials of the spacers for liquid crystal display of an org. or inorg. type is passed through the sieve having the apertures having the average aperture diameter of 3 to 40μm, by which the microgranular materials are sieved and the microgranular materials of <=10ppm in the content of the particles having grain size of >=2 times the average grain size are obtd. The sieve of <=±1.0μm in the accuracy of the aperture diameter is preferably used as the sieve to be used here. If the accuracy of the aperture diameter of the sieve exceeds±1.0μm, the grain size distribution of the resulted spacers for liquid crystal display is widened and such wide distribution is undesirable. The method of manufacturing the sieve is executed by electroforming, laser beam processing, etc.
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