FIELD: agriculture, food industry. SUBSTANCE: invention refers to preliminary treatment of seeds of oil-bearing cultures for subsequent production of oil by pressure. Working element includes pair of ring members with profiled working surfaces formed by flow and unloading grooves. Each flow groove has starting zone and zone of breakage of seed coats, unloading groove is located between adjacent flow grooves in zone of breakage of seed coats. EFFECT: increased reliability and prolonged service life of working element without decrease of treatment quality. 3 dwg
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