Modified cross-section lyocell material for tobacco filter, and preparation method therefor

A lyocell material having a modified cross-section for a tobacco filter, manufactured by spinning a lyocell spinning dope comprising a cellulose pulp and an N-methylmorpholine-N-oxide (NMMO) aqueous solution to produce a lyocell multifilament and crimping the lyocell multifilament to yield a crimped tow having 31 to 60 crimps per inch,

• wherein the lyocell multifilament comprises a monofilament having a modified cross-section,
• the modified cross-section includes a plurality of projections, and
• the plurality of projections come into contact with a first virtual circle and a second virtual circle included in the first virtual circle, are integrally formed with the second virtual circle serving as a center, and come into contact with the first virtual circle at ends thereof, a ratio (L1/L2) of a radius (L1) of the first virtual circle to a radius (L2) of the second virtual circle ranging from 1.5 to 5.0,
• wherein the first virtual circle has a radius (L1) of 8 to 27.78 μm, and
• wherein the cellulose pulp has a degree of polymerization (DPw) of 600 to 1700.