FIELD: electrical engineering; production of ceramic insulators for spark plugs from glass powder. SUBSTANCE: mill has exhaust air channel connected to grinding chamber of mill and provided with traps-collectors installed lengthwise in tandem. Number of traps-collectors corresponds to number of required milling fractions. EFFECT: provision of required number of fractions of different grain size directly during operation of mill without subsequent screening of powder which requires expensive fine-mesh sieves. 1 dwg
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