LYOCELL MATERIAL FOR CIGARETTE FILTER, AND PREPARATION METHOD THEREFOR

• US 20180007952A1
• Filed: 12/23/2015
• Published: 01/11/2018
• Est. Priority Date: 12/31/2014
• Status: Active Grant

• Current Assignee: Kolon Industries Incorporated, KT&G Corporation
• Original Assignee: Kolon Industries Incorporated, KT&G Corporation
• Inventors: JIN, Sang Woo, KIM, Woo Chul, CHO, Yong Kwan, JEONG, Jong Cheol, LEE, Sang Mok, LEE, Sang Yoel, KIM, Jong Yeol, KIM, Soo Ho, CHEONG, Bong Su, CHO, Hyun Suk, KI, Sung Jong, KIM, Hyeon Tae
• Granted Patent: US 10,617,146 B2
• Time in Patent Office: Days
• CPC Class Codes: A24D 3/02 Manufacture of tobacco smoke filters manufacture of paper or cellulosic materials for filters D21
• CPC Class Codes: A24D 3/0204 Preliminary operations before the filter rod forming process, e.g. crimping, blooming A24D3/0275 takes precedence
• CPC Class Codes: A24D 3/06 Use of materials for tobacco smoke filters
• CPC Class Codes: A24D 3/068 Biodegradable or disintegrable
• CPC Class Codes: A24D 3/10 of cellulose or cellulose derivatives
• CPC Class Codes: A24D 3/14 of organic materials as additive of ion exchange materials A24D3/12
• CPC Class Codes: D01D 5/22 with a crimped or curled structure; with a special structure to simulate wool producing crimped or curled effects in filaments or threads after formation D02G1/00
• CPC Class Codes: D01F 1/02 Addition of substances to the spinning solution or to the melt addition of substances to viscose D01F2/08
• CPC Class Codes: D01F 2/00 Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
• CPC Class Codes: D02G 1/12 using stuffer boxes

Abstract

This invention relates to a method of manufacturing a lyocell material for a cigarette filter, including (S1) spinning a lyocell spinning dope composed of 8 to 13 wt % of a cellulose pulp and 87 to 92 wt % of an N-methylmorpholine-N-oxide (NMMO) aqueous solution; (S2) coagulating the lyocell spinning dope spun in (S1), thus obtaining a lyocell multifilament; (S3) water-washing the lyocell multifilament obtained in (S2); (S4) oiling the lyocell multifilament water-washed in (S3); and (S5) applying steam and pressure to the lyocell multifilament obtained in (S4), thus obtaining a crimped tow having 30 to 40 crimps per inch.

Claims

1. A method of manufacturing a lyocell material for a cigarette filter, comprising:

(S1) spinning a lyocell spinning dope comprising 8 to 13 wt % of a cellulose pulp and 87 to 92 wt % of an N-methylmorpholine-N-oxide (NMMO) aqueous solution;

(S2) coagulating the lyocell spinning dope spun in (S1), thus obtaining a lyocell multifilament;

(S3) water-washing the lyocell multifilament obtained in (S2);

(S4) oiling the lyocell multifilament water-washed in (S3); and

(S5) applying steam and pressure to the lyocell multifilament obtained in (S4), thus obtaining a crimped tow having 30 to 40 crimps per inch.

2. The method of claim 1, wherein in the lyocell spinning dope of (S1), the cellulose pulp comprises 85 to 99 wt % of alpha-cellulose and has a degree of polymerization (DPw) of 600 to 1700.

3. The method of claim 1, wherein the coagulating in (S2) comprises primary coagulation using air quenching (Q/A) including supplying cold air to the spinning dope and secondary coagulation including immersing the primarily coagulated spinning dope in a coagulation solution.

4. The method of claim 3, wherein the air quenching is performed by supplying the cold air at a temperature of 4 to 15°

C. and a wind velocity of 30 to 120 m/s to the spinning dope, and

the coagulation solution has a temperature of 30°

C. or less.

5. The method of claim 1, wherein (S5) is performed using a stuffer box.

6. The method of claim 5, wherein the stuffer box is controlled so that a steam pressure is 0.1 to 3 kgf/cm², a press roller pressure is 1.5 to 4 kgf/cm², and an upper plate pressure is 0.1 to 3 kgf/cm².

7. A lyocell material for a cigarette 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 applying steam and pressure to the lyocell multifilament to give a crimped tow,

wherein the crimped tow has 30 to 40 crimps per inch.

8. The lyocell material of claim 7, wherein the lyocell spinning dope comprises 8 to 13 wt % of a cellulose pulp and 87 to 92 wt % of an N-methylmorpholine-N-oxide aqueous solution.

9. The lyocell material of claim 7, wherein the cellulose pulp comprises 85 to 99 wt % of alpha-cellulose and has a degree of polymerization (DPw) of 600 to 1700.

10. The lyocell material of claim 8, wherein the cellulose pulp comprises 85 to 99 wt % of alpha-cellulose and has a degree of polymerization (DPw) of 600 to 1700.