Method of manufacturing a lyocell material for a cigarette filter

  • US 10,617,146 B2
  • Filed: 12/23/2015
  • Issued: 04/14/2020
  • Est. Priority Date: 12/31/2014
  • Status: Active Grant
First Claim
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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 water-washed lyocell multifilament obtained in (S3); and

    (S5) applying steam and pressure to the lyocell multifilament obtained in (S4) to give a crimped tow having 30 to 40 crimps per inch,wherein the (S5) is performed using a stuffer box, wherein an upper plate pressure of the stutter box is 0.1 to 3 kgf/cm2 and an interval of press rollers of the stuffer box is 0.01 to 3.0 mm.

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