FIELD: textile industry. SUBSTANCE: apparatus has housing with complex thread through passage, which is defined by first wall surface and second wall surface opposed to nozzle outlet opening. At least one nozzle is extending from lateral side of first wall surface into thread passage. At least one of wall surfaces is longitudinally curved along thread passage to gradually increase distance between both surfaces from minimum value at nozzle outlet opening to ends of thread passage. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 10 cl, 8 dwg
