Cotton-like knitted fabric, polyester filament and production method thereof

Abstract

The present invention provides a cotton-like knitted fabric, a polyester filament and a production method. The fabric is a weft-knitted fabric obtained by material containing at least above 45% by weight of polyester filaments; the pore area distribution of the fabric is centered on 6000 to 22000 μm2 and has a statistical variability of above 2a, and the coefficient of variation of the pore area is greater than 40%. The polyester filament is formed from alternatingly arranged twist regions in a false-twist direction and twist regions in an opposite direction, wherein the twist regions in the false-twist direction have an average length of less than 0.3 cm, a coefficient of variation of length of above 60%, a diameter that is 30% to 70% of the diameter of the twist regions in the opposite direction, and a total length that is 20.0% to 40.0% of the total length of the polyester filaments.

1 . A cotton-like knitted fabric, wherein the fabric is a weft-knitted fabric obtained by material containing at least above 45% by weight of polyester filaments; and, the pore area distribution of the fabric is centered on 6000 to 22000 μm 2  and has a statistical variability of above 2σ, and the coefficient of variation of the pore area is greater than 40%. 
     
     
         2 . The cotton-like knitted fabric according to  claim 1 , wherein the content of the polyester filament is 100% by weight. 
     
     
         3 . The cotton-like knitted fabric according to  claim 1 , wherein the polyester filament is formed from alternatingly arranged twist regions in a false-twist direction and twist regions in an opposite direction, wherein the twist regions in the false-twist direction have an average length of less than 0.3 cm, a coefficient of variation of length above 60%, a diameter that is 30% to 70% of the diameter of the twist regions in the opposite direction, and a total length that is 20.0% to 40.0% of the total length of the polyester filaments. 
     
     
         4 . The cotton-like knitted fabric according to  claim 1 , wherein the polyester filament has a total fineness of 56 to 220 dtex, and a monofilament fineness of less than 1.30 dtex. 
     
     
         5 . The cotton-like knitted fabric according to  claim 1 , wherein the fabric is a pile fabric. 
     
     
         6 . The cotton-like knitted fabric according to  claim 1 , wherein the fabric is obtained by knitting a single filament or jointly knitting two filaments. 
     
     
         7 . The cotton-like knitted fabric according to  claim 1 , wherein the fabric has a bending rigidity of 0.015 to 0.045 N·cm 2 /cm, a surface roughness of 3.0 to 6.0μ, and a compression energy of 0.20 to 0.80 N·cm/cm 2 . 
     
     
         8 . A polyester filament, wherein the polyester filament is formed from alternatingly arranged twist regions in a false-twist direction and twist regions in an opposite direction, wherein the twist regions in the false-twist direction have an average length of less than 0.3 cm, a coefficient of variation of length of above 60%, a diameter that is 30% to 70% of the diameter of the twist regions in the opposite direction, and a total length that is 20.0% to 40.0% of the total length of the polyester filament. 
     
     
         9 . The polyester filament according to  claim 8 , wherein the polyester filament has a total fineness of 56 to 220 dtex, and a monofilament fineness of less than 1.30 dtex. 
     
     
         10 . A method for manufacturing the polyester filament according to  claim 8 , comprising the following steps of:
 leading a polyester pre-oriented yarn into a first roller, then into a first hot box for heating, and finally into a false twister, a second roller, a second hot box and a third roller to obtain the polyester filament,   wherein the temperature in the first hot box is 230° C. to 250° C.; and,   
       the D/Y ratio in the step is 1.5 to 2.5.