FIELD: civil engineering; structural articles. SUBSTANCE: device has equidistant projections spaced over each facet. The cross-sections increase with the distance in the direction of the outlet orifice being equal in form and size at the end of the calibrating zone. Length of the projections adjacent to the nozzle corners is greater than or equal to the length of intermediate projections making up 0,2-1,0 of the nozzle length. EFFECT: enhanced quality of end products. 3 cl, 4 dwg
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