Textile using a flat multilobar cross-section fiber

Abstract

A fabric is subjected to calender processing on one or both surfaces and includes a polyamide fiber as warp or/and woof having, after calender processing, a single filament fineness of 0.5 to 2.5 dtex and a total fiber fineness of 5 to 50 dtex, the single filament having a cross-sectional shape that is flat multifoliar with 6 to 10 lobe parts and has a flat ratio (W) (α/β) of 1.5 to 3.0, the fabric having a cover factor of 1200 to 2500.

1 - 7 . (canceled) 
     
     
         8 . A fabric subjected to calender processing on one or both surfaces, comprising a polyamide fiber used as warp or/and woof having, after calender processing of the fabric, a single filament fineness of 0.5 to 2.5 dtex and a total fiber fineness of 5 to 50 dtex, the single filament having a cross-sectional shape that is flat multifoliar with 6 to 10 lobe parts and has a flat ratio (W) (α/β) of 1.5 to 3.0, wherein a is a length of a line segment A, which is a longest line segment connecting any two apexes of convex portions of the flat multifoliar shape, and β is a length of a line segment B of a circumscribed quadrangle formed by lines parallel to the line segment A and are tangent lines containing outermost apexes (the angle between adjacent sides is 90°), the line segment B being other than the lines parallel to the line segment A, the fabric having a cover factor of 1200 to 2500. 
     
     
         9 . The fabric according to  claim 8 , wherein the polyamide fiber has, before calender processing of the fabric, a single filament fineness of 0.4 to 2.2 dtex and a total fiber fineness of 4 to 44 dtex, the single filament having a cross-sectional shape that is flat multifoliar with 6 to 10 leaves and satisfies both equations:
   Flat ratio ( F )( a/b )=1.5  to  3.0     Modified shape ratio ( F )( c/d )=1.0  to  8.0   wherein a is a length of a longest line segment A connecting any two apexes of convex portions of the flat multifoliar shape; b is a length of a line segment B of a circumscribed quadrangle formed by lines parallel to the line segment A and are tangent lines containing outermost apexes (the angle between adjacent sides is 90°), the line segment B being other than the lines parallel to the line segment A; c is a length of a line segment C connecting the apexes of adjacent convex portions of the largest concavity and convexity among concavities and convexities formed by the flat multifoliar shape; and d is a length of a perpendicular D drawn from the bottom of a concave portion between the convex portions to the line segment C connecting the apexes of the convex portions   
     
     
         10 . The fabric according to  claim 8 , having a tear strength of 5.0 N or more and an initial air permeability of 1.0 cc/cm 2 /s or lower. 
     
     
         11 . The fabric according to  claim 8 , having an air permeability after fifty washing of 1.0 cc/cm 2 /s or lower. 
     
     
         12 . The fabric according to  claim 8 , wherein the difference between the initial air permeability and the air permeability after fifty washing is 0.4 cc/cm 2 /s or less. 
     
     
         13 . A sewn product obtained by using the fabric according to  claim 8  at least in part. 
     
     
         14 . A down shell or a down jacket obtained by using the fabric according to  claim 8  at least in part. 
     
     
         15 . The fabric according to  claim 9 , having a tear strength of 5.0 N or more and an initial air permeability of 1.0 cc/cm 2 /s or lower. 
     
     
         16 . The fabric according to  claim 9 , having an air permeability after fifty washing of 1.0 cc/cm 2 /s or lower. 
     
     
         17 . The fabric according to  claim 10 , having an air permeability after fifty washing of 1.0 cc/cm 2 /s or lower. 
     
     
         18 . The fabric according to  claim 9 , wherein the difference between the initial air permeability and the air permeability after fifty washing is 0.4 cc/cm 2 /s or less. 
     
     
         19 . The fabric according to  claim 10 , wherein the difference between the initial air permeability and the air permeability after fifty washing is 0.4 cc/cm 2 /s or less. 
     
     
         20 . The fabric according to  claim 11 , wherein the difference between the initial air permeability and the air permeability after fifty washing is 0.4 cc/cm 2 /s or less. 
     
     
         21 . A sewn product obtained by using the fabric according to  claim 9  at least in part. 
     
     
         22 . A sewn product obtained by using the fabric according to  claim 10  at least in part. 
     
     
         23 . A sewn product obtained by using the fabric according to  claim 11  at least in part. 
     
     
         24 . A sewn product obtained by using the fabric according to  claim 12  at least in part. 
     
     
         25 . A down shell or a down jacket obtained by using the fabric according to  claim 9  at least in part. 
     
     
         26 . A down shell or a down jacket obtained by using the fabric according to  claim 10  at least in part. 
     
     
         27 . A down shell or a down jacket obtained by using the fabric according to  claim 11  at least in part.