FIELD: agricultural, flour milling and other branches of industry. SUBSTANCE: sieving frame may be inserted into box or it may be placed on it. Box includes frame with bottom and apparatus for discharging finely ground product. Sieving frame and rack bridge or rack bridges are in the form of monolithic polymeric part. Sieving frame is made by filling form with foamed polyurethane. Carcass is placed in said form and sieving web is arranged in tensioned state at predetermined distance from it; then during one working operation form is filled with foamed material for making sieving frame with rack bridge or bridges. Simultaneously sieving web (due to applying foamed material around it) is connected with sieving frame and with rack bridge or bridges. EFFECT: enhanced functional properties of frame, simplified process for making it. 7 cl, 3 dwg
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