FIELD: production of propylene film threads, in particular, controlling of process for hardening of polypropylene thread through controlling of polymer crystallizing point.
SUBSTANCE: method involves determining ratio of pulling polypropylene thread during orientation thereof; depending on extent of said ratio, changing level of crystallizing point through changing of cooling air flow rate.
EFFECT: increased stability of molding process, improved strength and stability of parameters of polypropylene thread.
2 dwg, 1 ex
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