LYOCELL MATERIAL WITH MODIFIED CROSS SECTION, CIGARETTE FILTER AND METHODS OF THEIR PRODUCTION Russian patent published in 2025 - IPC A24D3/06 

FIELD: tobacco filters smoke.

SUBSTANCE: group of inventions relates to a method for manufacture of lyocell material with a modified cross section for a cigarette filter, to lyocell material with a modified cross section for a cigarette filter, a method for manufacture of a cigarette filter and a cigarette filter. Method for manufacturing a lyocell material with a modified cross section for a cigarette filter comprises: spinning a lyocell spinning solution using a spinning mechanism capable of forming a modified cross section having at least three projections; coagulation of spun lyocell spinning solution to produce lyocell multifilament; oiling the lyocell multifilament; and crimping by feeding the oiled lyocell multifilament into a crimping machine such that the lyocell multifilament is exposed to steam and pressure, in which the lyocell multifilament comprises a monofilament with a modified cross section, the modified cross section has at least three projections, each of at least three projections has coefficient of modified shape (K_s) 0.6 or more, calculated as: K_s = L/W and a width coefficient (K_w) from 0.5 to 2.0, calculated as: K_w = W₁/W₂, where: L is the length of each of the three projections, which is calculated as the distance from the centre of a straight line connecting two points, where one projection intersects with two projections immediately adjacent to one projection, to the end point of this one projection; W is width of each of three projections, wherein width is calculated as arithmetic average width of projection (W₁) at point corresponding to 10% of length (L), and width of projection (W₂), at point corresponding to 90% of length (L). Lyocell multifilament has total fineness from 15,000 denier to 45,000 denier, and the monothreads making up the lyocell multifilament have fineness of one fibre from 1.5 denier to 8.0 denier.

EFFECT: high technological efficiency of filter production, biodegradability of filters.

16 cl, 2 dwg, 1 tbl, 9 ex