Lyocell material for tobacco filter

Patent metadata

Field	Value
Publication number	US-11330836-B2
Application number	US-201916688838-A
Country	US
Kind code	B2
Filing date	Nov 19, 2019
Priority date	Jun 28, 2013
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

A lyocell material for a cigarette filter and a method of manufacturing the same are disclose. The lyocell material which is biodegradable and eco-friendly can be manufactured by crimping lyocell multifilaments to obtain a crimped tow.

First claim

The invention claimed is:

1. 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 lyocell multifilaments which are then crimped, and the lyocell multifilaments are having 25-30 crimps per inch.

2. The lyocell material of claim 1 , wherein the lyocell spinning dope comprises 6˜16 wt % of the cellulose pulp and 84-94 wt % of the NMMO aqueous solution.

3. The lyocell material of claim 2 , wherein the cellulose pulp comprises 85-97 wt % of alpha-cellulose, and has a degree of polymerization (DPw) of 600-1700.

4. The lyocell material of claim 1 , manufactured by a method comprising the following steps:
(S1) spinning a lyocell spinning dope comprising a cellulose pulp and an N-methylmorpholine-N-oxide (NMMO) aqueous solution;
(S2) coagulating the lyocell spinning dope spun in the step (S1), thus obtaining lyocell multifilaments;
(S3) water-washing the lyocell multifilaments obtained in the step (S2);
(S4) oil-treating the lyocell multifilaments water-washed in the step (S3); and
(S5) crimping the lyocell multifilaments oil-treated in the step (S4) using a stuffer box, thus obtaining a crimped tow having 25-30 crimps per inch,
wherein coagulating in the step (S2) comprises a primary coagulation using air quenching (Q/A) including supplying cold air at a temperature of 4-15° C. and a wind velocity of 5-50 m/s to the spinning dope and a secondary coagulation including immersing the primarily coagulated spinning dope in a coagulation solution,
wherein the cold air is supplied outwardly from an air cooling part positioned inside a donut-shaped spinneret, and
wherein the step (S5) is performed by supplying steam having a pressure of 0.1-1.0 kgf/cm 2 to an interior of the stuffer box and pressing the lyocell multifilaments using a press roller at a pressure of 1.5-2.0 kgf/cm 2 to give the lyocell multifilaments having 25-30 crimps per inch.

5. The lyocell material of claim 4 , wherein the coagulation solution has a temperature of 30° C. or less.

Assignees

• Kolon Inc
• Kt & G Corp

Inventors

• Jeong Jong Cheol
• Kim Woo Chul
• Jin Sang Woo
• Yang Burm Ho
• Seo Man Seok
• Lee Kyung Joon
• Cho Hyun Suk
• Kim Jong Yeol

Classifications

• A24D3/06

  Use of materials for tobacco smoke filters · CPC title

• D02G1/12 Primary

  using stuffer boxes · CPC title

• D02G1/00

  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) · CPC title

• B29L2031/7416

  for cigars or cigarettes · CPC title

• A24D3/068

  Biodegradable or disintegrable · CPC title