FIELD: processes for producing of synthetic, in particular, high-strength, polypropylene fibers.
SUBSTANCE: method for producing of fibers having minimal thickness, strength exceeding 6 sN/decitex and elongation less than 40% involves forming cords from melt having low temperature, in particular less than 250 C; discharging said cords at relatively low feeding speed which is less than 100 m/min, and simultaneously cooling said cord using gaseous cooling medium; subjecting cords to stretching in at least three stretching stages at total stretching ratio of 4:1. At first stretching stage, cord partial stretching degree is at least 70% by total stretching degree. After termination of stretching procedure, cords are cut into polypropylene fibers. Also, apparatus for manufacture of high-strength polypropylene fibers is described. Method allows thin fibers with single filament titer less than 2 decitex to be produced.
EFFECT: increased efficiency in producing of polypropylene fibers having minimal thickness and elongation degree and maximal strength.
15 cl, 2 dwg
