Lyocell material for tobacco filter and method for preparing same

  • US 10,517,325 B2
  • Filed: 06/02/2014
  • Issued: 12/31/2019
  • Est. Priority Date: 06/28/2013
  • 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 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, andwherein the step (S5) is performed by the supplying steam having a pressure of 0.1-1.0 kgf/cm2 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/cm2 to give the lyocell multifilaments having 25-30 crimps per inch.

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