Flat multifilament-yarn textile

Abstract

A flat multifilament yarn woven fabric having a low air permeability and excellent vision through-preventing property and water- or perspiration-absorbing property includes, as warp and/or weft yarns, multifilament yarns formed from a plurality of artificial individual filaments having a flat cross-sectional profile in which, on both the sides of a longitudinal center line of the profile, 3 or more projections projecting outward from the longitudinal center line and 2 or more constrictions formed between the projections, per side of the profile are formed approximately in symmetry with respect to the longitudinal center line, and a degree of flatness of the profile represented by a ratio (B/C1) of a largest length B of the profile in the direction of the longitudinal center line to a largest width C1 of the profile in the direction of right angles to the longitudinal center line is 2 to 6, the woven fabric having a cover factor of 800 to 3500.

1 . A flat multifilament yarn woven fabric comprising a plurality of multifilament yarns comprising a plurality of artificial individual filaments comprising, as a principal component, an artificial fiber-forming polymer and having a flat cross-sectional profile, 
 wherein in both the side sections of a longitudinal center line of the flat cross sectional profile of each artificial individual filament, at least three projections per side section are projecting outward from the longitudinal center line and at least two constrictions per side section formed between the projections are formed approximately in symmetry with respect to the longitudinal center line, and a degree of flatness of the cross-sectional profile represented by a ratio (B/C1) of a largest length (B) of the cross-sectional profile in the direction of the longitudinal center line to a largest width (C1) of the cross-sectional profile in the direction at right angles to the longitudinal center line is 2 to 6, and woven fabric has a cover factor of 800 to 3500.    
   
   
       2 . The flat multifilament yarn woven fabric as claimed in  claim 1 , wherein the artificial fiber-forming polymer is selected from polyesters, polyamides, polyvinylidene chloride, polypropylene, regenerated cellulose and cellulose acetates.  
   
   
       3 . The flat multifilament yarn woven fabric as claimed in  claim 1 , wherein in the cross-sectional profile of the artificial individual filaments, a ratio (C1/C2) of the largest width (C1) to a smallest width (C2) is in the range of from 1.05 to 4.00.  
   
   
       4 . The flat multifilament yarn woven fabric as claimed in  claim 1 , wherein the total thickness of the multifilament yarns is in the range of from 30 to 170 dtex and the thickness of the individual filaments is in the range of from 0.5 to 5 dtex.  
   
   
       5 . The flat multifilament yarn woven fabric as claimed in  claim 1 , having a weave structure selected from plain weave, twill weave and satin weave structures.  
   
   
       6 . The flat multifilament yarn woven fabric as claimed in  claim 1 , wherein the multifilament yarns comprising the artificial individual filaments having the flat cross-sectional profile is contained in an amount of 10 to 100% by mass based on the mass of the fabric.  
   
   
       7 . The flat multifilament yarn woven fabric as claimed in  claim 1 , wherein the cover factor of the woven fabric is in the range of from 1500 to 3500.  
   
   
       8 . The flat multifilament yarn woven fabric as claimed in  claim 7 , wherein the multifilament yarn has a number of twists of 0 to 2500 turns/m.  
   
   
       9 . The flat multifilament yarn woven fabric as claimed in  claim 7 , having an air permeability of 5 ml/cm 2 ·sec or less, determined in accordance with JIS L 1096- 1998 , 6.27.1, Method A (using a Frazir type tester).  
   
   
       10 . The flat multifilament yarn woven fabric as claimed in  claim 9 , wherein the air-permeability is in the range of from 0.1 to 4.0 ml/cm 2 ·sec.  
   
   
       11 . The flat multifilament yarn woven fabric as claimed in  claim 7 , having a water absorption velocity of 40 mm or more, determined in accordance with JIS L 1096- 1998 , 6.26.1, (2) Method B (Byreck method).  
   
   
       12 . The flat multifilament yarn woven fabric as claimed in  claim 7 , having an abrasion resistance of 50 or more abrasions, determined in accordance with JIS L 1096- 1998 , 6.17.1, (1) Method A-1 (flat surface method).  
   
   
       13 . A low air permeability textile material comprising a flat multifilament yarn woven fabric as claimed in any of  claims 7  to  12 .  
   
   
       14 . The flat multifilament yarn woven fabric as claimed in  claim 1 , wherein the artificial individual filaments of the multifilament yarn contains 0.2% or more by mass of a delustering agent and the cover factor of the woven fabric is in the range of from 1300 to 3000.  
   
   
       15 . The flat multifilament yarn woven fabric as claimed in  claim 14 , wherein the multifilament yarn has a number of twists of 0 to 1500 turns/m.  
   
   
       16 . The flat multifilament yarn woven fabric as claimed in  claim 14 , having a degree of vision through-prevention of the woven fabric represented, in a L*a*b* color system, by a difference ΔL(L=L* w −L* b ) between an L* value of the woven fabric placed on a white plate, represented by L* w , and an L* value of the woven fabric placed on a black plate, represented by L* b , is 15 or less.  
   
   
       17 . The flat multifilament yarn woven fabric as claimed in  claim 14 , having a water absorption velocity of 40 mm or more, determined in accordance with JIS L 1096- 1998 , 6.26.1, (2) Method B (Byreck method).  
   
   
       18 . A vision through-preventive, perspiration-absorbent textile material comprising a flat multifilament yarn woven fabric as claimed in any of  claims 14  to  17 .  
   
   
       19 . The flat multifilament yarn woven fabric as claimed in  claim 1 , wherein the artificial individual filaments of the multifilament yarn contains 0 to 0.2% by mass and the cover factor of the woven fabric is in the range of from 800 to 2000.  
   
   
       20 . The flat multifilament yarn woven fabric as claimed in  claim 19 , wherein the multifilament yarn has a number of twists of 0 to 1000 turns/m.  
   
   
       21 . The flat multifilament yarn woven fabric as claimed in  claim 19 , having a degree of light transmittance of 10 to 70%, determined in accordance with JIS L 1055- 1987 , 6.1. Method A, at a degree of illumination of 100000 lx.  
   
   
       22 . A vision through-preventive textile material comprising a flat multifilament yarn woven fabric as claimed in any of  claims 19  to  21 .