Non-woven fiber aggregates and mask pack sheet using the same

Abstract

The present disclosure relates to a nonwoven fiber assembly and a mask pack sheet using the same, and specifically, to a nonwoven fiber assembly which has excellent bending characteristics for a use in an industrial material, having a pleasant feel and a soft gloss property for a use in clothes or interior decoration, having excellent physical properties such as transparency, skin adhesiveness, absorbency and retention of a solvent such as water, and a smooth surface feeling for use in a sheet mask nonwoven fiber assembly, and includes a lyocell fiber having a large specific surface area, and a mask pack sheet using the nonwoven fiber assembly.

1 . A nonwoven fiber assembly comprising a lyocell fiber prepared by spinning a lyocell spinning dope containing a cellulose pulp and an N-methylmorpholine-N-oxide aqueous solution,
 wherein a cross-section of lyocell monofilaments included in the lyocell fiber includes a plurality of protrusions, and   the plurality of protrusions come in contact with a virtual first circle and a virtual second circle contained inside the virtual first circle, and are integrally formed around the virtual second circle, and the end thereof has a shape in contact with the first virtual circle.   
     
     
         2 . The nonwoven fiber assembly according to  claim 1 , wherein the lyocell spinning dope contains 6 to 16% by weight of cellulose pulp, and 84 to 94% by weight of an N-methylmorpholine-N-oxide aqueous solution. 
     
     
         3 . The nonwoven fiber assembly according to  claim 1 , wherein the cellulose pulp contains 85 to 97% by weight of alpha-cellulose, and has a degree of polymerization (DPw) of 600 to 1700. 
     
     
         4 . The nonwoven fiber assembly according to  claim 1 , wherein the lyocell fiber has a space occupancy ratio of 150 to 300% as defined by Equation 1 below:
   Space occupancy ratio (%)=(Area of first virtual circle/Cross-sectional area of lyocell monofilament)×100.  <Equation 1>
   
     
     
         5 . The nonwoven fiber assembly according to  claim 1 , wherein the virtual first circle has a radius of 6.0 to 7.8  . 
     
     
         6 . The nonwoven fiber assembly according to  claim 1 , wherein the virtual second circle has a radius of 1.8 to 2.1  . 
     
     
         7 . The nonwoven fiber assembly according to  claim 1 , wherein a center of the virtual first circle may be identical to a center of the second circle. 
     
     
         8 . The nonwoven fiber assembly according to  claim 1 , wherein the lyocell fiber has fineness of 1.0 to 1.5 denier. 
     
     
         9 . The nonwoven fiber assembly according to  claim 1 , wherein the lyocell fiber has a fiber length of 36 to 40 mm. 
     
     
         10 . The nonwoven fiber assembly according to  claim 1 , wherein the number of crimps of the lyocell fiber is 5 to 20 cpi. 
     
     
         11 . The nonwoven fiber assembly according to  claim 1 , wherein an oil content of the lyocell fiber is 0.1 to 0.4% by weight relative to 100% by weight of the lyocell fiber. 
     
     
         12 . The nonwoven fiber assembly according to  claim 1 , wherein a basis weight of the nonwoven fiber aggregate is 30 to 60 g/m 2 . 
     
     
         13 . The nonwoven fiber assembly according to  claim 1 , wherein the nonwoven fiber assembly has a thickness of 0.3 to 0.6 mm. 
     
     
         14 . The nonwoven fiber assembly according to  claim 1 , wherein the nonwoven fiber aggregate has a water absorption rate of 1000 to 1600% relative to the weight of the lyocell fiber. 
     
     
         15 . The nonwoven fiber assembly according to  claim 1 , wherein the nonwoven fiber aggregate has transparency of 80 to 84% after water treatment. 
     
     
         16 . The nonwoven fiber assembly according to  claim 1 , wherein the nonwoven fiber aggregate has transparency of 88 to 94% after essence treatment. 
     
     
         17 . The nonwoven fiber assembly according to  claim 1 , wherein the nonwoven fiber aggregate has skin adhesion of 3.6 to 4.2 gf after water treatment. 
     
     
         18 . The nonwoven fiber assembly according to  claim 1 , wherein the nonwoven fiber aggregate has skin adhesion of 4.5 to 5.3 gf after essence treatment. 
     
     
         19 . The nonwoven fiber assembly according to  claim 1 , wherein the nonwoven fiber aggregate has an oil content of 0.001% by weight or less relative to 100% by weight of the nonwoven fiber aggregate. 
     
     
         20 . A mask pack sheet using the nonwoven fiber assembly according to  claim 1 .