# US 10,306,919 B2 · Lyocell material for cigarette filter and method for preparing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,306,919 B2 - Document ID: US10306919B2 - Status: Granted - Kind: B2 - Application number: 15/024,936 - Filed: 2014-09-26 - Published: 2016-08-18 - Granted: 2019-06-04 - Earliest claimed: 2013-09-26 - Assignees: Kolon Industries, Inc.; Kt&G Corporation - Applicants: Kolon Industries, Inc.; Kt&G Corporation - Inventors: Jong Cheol Jeong; Sang Woo Jin; Sang Mok Lee; Woo Chul Kim; Sang Yoel Lee; Jong Yeol Kim; Soo Ho Kim; Bong Su Cheong; Hyun Suk Cho; Sung Jong Ki - Web page: https://patentgrep.com/patent/US10306919B2 ## CPC - A24D 3/0204: {Preliminary operations before the filter rod forming process, e.g. crimping, blooming (A24D3/0275 takes precedence)} - A24D 3/067: {characterised by functional properties} - A24D 3/068: {Biodegradable or disintegrable} - A24D 3/10: of cellulose or cellulose derivatives - B29C 48/0019: {combined with shaping by flattening, folding or bending} - B29C 48/022: {characterised by the choice of material} - D01D 1/02: Preparation of spinning solutions - D01D 5/06: Wet spinning methods {(D01D5/0046 takes precedence)} - D01D 10/06: Washing or drying - D01F 2/00: Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof - D02G 1/00: Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics (yarns per se D02G3/00; during formation of artificial filaments, threads, or the like D01D5/22; general aspects of chemical treatment D06M) - B29K 2001/12: {Cellulose acetate} - B29L 2031/14: Filters {(optical filters B29L2011/0066, sieves or screens B29L2031/737)} - B29L 2031/7416: {for cigars or cigarettes} - D10B 2201/28: Cellulose esters or ethers, e.g. cellulose acetate - D10B 2503/00: Domestic or personal - A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS - D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS - D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES - D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES ## Abstract Disclosed are a lyocell material for a cigarette filter and a method of preparing the same, wherein a crimped tow is manufactured using a lyocell multifilament including low-strength lyocell monofilaments, and thus the ultimately prepared lyocell material for a cigarette filter can exhibit low strength, thereby increasing processing efficiency during the manufacture of the cigarette filter. ## Claims ### Claim 1 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 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 (S5) are performed so that the crimped tow of (S5) has a tensile strength of 1 to 2 g/d. ### Claim 2 (depends on 1) The method of claim 1, wherein in (S1), the cellulose pulp comprises 85 to 97 wt % of alpha-cellulose and has a degree of polymerization (DPw) of 600 to 1700. ### Claim 3 (depends on 1) The method of claim 1, wherein in (S1), the spinning is performed at 100 to 110° C. ### Claim 4 (depends on 1) The method of claim 1, wherein the coagulation solution in the secondary coagulation has a temperature of 30° C. or less. ### Claim 5 (depends on 1) The method of claim 1, wherein the crimping is performed by supplying steam to the lyocell multifilament and applying pressure thereto. ### Claim 6 (depends on 5) The method of claim 5, wherein the crimping is performed by supplying the lyocell multifilament with steam at a pressure of 0.1 to 1.0 kgf/cm2 and pressing the lyocell multifilament using a press roller at a pressure of 1.5 to 2.0 kgf/cm2. ### Claim 7 (depends on 1) The method of claim 1, wherein (S1) to (S4) are performed so that the lyocell monofilaments obtained in (S4) have a fineness of 1.0 to 8.0 denier. ### Claim 8 (depends on 1) The method of claim 1, wherein (S1) to (S4) are performed so that the lyocell monofilaments obtained in (S4) have an elongation of 5 to 13%. ### Claim 9 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. ### Claim 10 (depends on 9) The method of claim 9, wherein in (S1), the cellulose pulp comprises 85 to 97 wt % of alpha-cellulose and has a degree of polymerization (DPw) of 600 to 1700. ### Claim 11 (depends on 9) The method of claim 9, wherein in (S1), the spinning is performed at 100 to 110° C. ### Claim 12 (depends on 9) The method of claim 9, wherein the coagulation solution in the secondary coagulation has a temperature of 30° C. or less. ### Claim 13 (depends on 9) The method of claim 9, wherein the crimping is performed by supplying steam to the lyocell multifilament and applying pressure thereto. ### Claim 14 (depends on 13) The method of claim 13, wherein the crimping is performed by supplying the lyocell multifilament with steam at a pressure of 0.1 to 1.0 kgf/cm2 and pressing the lyocell multifilament using a press roller at a pressure of 1.5 to 2.0 kgf/cm2. ### Claim 15 (depends on 9) The method of claim 9, wherein (S1) to (S4) are performed so that the lyocell monofilaments obtained in (S4) have a fineness of 1.0 to 8.0 denier. ### Claim 16 (depends on 9) The method of claim 9, wherein (S1) to (S4) are performed so that the lyocell monofilaments obtained in (S4) have an elongation of 5 to 13%.