Lyocell material for cigarette filter and method for preparing same

A method of preparing a lyocell material for a cigarette filter, comprising:

• (S1) spinning a lyocell spinning dope including cellulose pulp and an N-methylmorpholine-N-oxide (NMMO) aqueous solution, in which a concentration of the cellulose pulp is 8 to 11%;
• (S2) coagulating the lyocell spinning dope spun in (S1), thus obtaining a coagulated lyocell multifilament;
• (S3) water-washing the lyocell multifilament coagulated in (S2);
• (S4) oil-treating and drying the lyocell multifilament water-washed in (S3);
• and
• (S5) crimping the lyocell multifilament oil-treated in (S4), thus preparing a crimped tow,
• wherein in (S2), the coagulating comprises primary coagulation using air quenching (Q/A) by supplying the spun lyocell spinning dope with cold air at a temperature of 4 to 15° C. and an air flow rate of 70 to 90 m3/hr, and secondary coagulation by placing the primarily coagulated lyocell spinning dope in a coagulation solution,
• wherein in (S5), the crimping is performed so as to form 25 to 30 crimps per inch in the lyocell multifilament obtained in (S4), and
• wherein (S1) to (S4) are performed so that monofilaments of the lyocell multifilament obtained in (S4) have a strength of 2.0 to 3.5 g/d.