METHOD FOR PRODUCING OF VISCOSE STAPLE FIBER CONTAINING ANTIBACTERIAL PREPARATION AND NON-WOVEN MATERIAL FROM THE SAME Russian patent published in 2007 - IPC D01F2/06 D04H1/46 D06M13/33 B01D39/04 

FIELD: chemical and light industry, in particular, production of viscose staple fiber containing antibacterial preparation for manufacture of non-woven material used for manufacture of air filters.

SUBSTANCE: method involves washing formed viscose threads; squeezing to provide 50%-content of α-cellulose; treating with aqueous catamine solution having mass concentration of 15-40 g/dm³; providing two-staged washing procedure in countercurrent of softened water at feeding and discharge temperature difference making 4-6 C at first stage and 3-5 C at second stage. Temperature of aqueous catamine solution is 18-30 C. Resultant thread has linear density of single fibers of 0.17-0.22 tex and mass fraction of 0.6-4.0% of catamine. Thread is subjected to drying process at temperature of drying drum surface of 80-90 C, followed by corrugation and cutting into 60-70 mm long fibers. Method further involves fixing resultant fibrous web by stitching process on substrate of thermally secured polypropylene having surface density of 10-30 g/m².

EFFECT: enhanced antibacterial properties and reduced aerodynamic resistance of resultant material allowing blowing-off of fibers from filter layer by flow of air under filtering process to be prevented.

3 cl, 2 tbl, 6 ex