Modified cross-section lyocell material for tobacco filter, and preparation method therefor

  • US 11,103,003 B2
  • Filed: 06/30/2015
  • Issued: 08/31/2021
  • Est. Priority Date: 06/30/2014
  • Status: Active Grant
First Claim
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1. A lyocell material having a modified cross-section for a tobacco 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 crimping the lyocell multifilament to yield a crimped tow having 31 to 60 crimps per inch,wherein the lyocell multifilament comprises a monofilament having a modified cross-section,the modified cross-section includes a plurality of projections, andthe plurality of projections come into contact with a first virtual circle and a second virtual circle included in the first virtual circle, are integrally formed with the second virtual circle serving as a center, and come into contact with the first virtual circle at ends thereof, a ratio (L1/L2) of a radius (L1) of the first virtual circle to a radius (L2) of the second virtual circle ranging from 1.5 to 5.0,wherein the first virtual circle has a radius (L1) of 8 to 27.78 μ

  • m, andwherein the cellulose pulp has a degree of polymerization (DPw) of 600 to 1700.

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