Bielastic fabric and its manufacturing process

Abstract

There are described a bielastic fabric comprising biopolyamide yarn and elastane yarn, having excellent elastic properties and high dimensional stability, and a cost-effective, efficient process for obtaining it.

1 . A bielastic fabric comprising biopolyamide yarn and elastane yarn. 
     
     
         2 . The bielastic fabric of  claim 1 , having a basis weight of 50-270 g/sqm. 
     
     
         3 . The bielastic fabric of  claim 1 , wherein said biopolyamide yarn has a count of 10-200 dTex. 
     
     
         4 . The bielastic fabric of  claim 1 , wherein said elastane yarn has a count of 10-200 dTex. 
     
     
         5 . The bielastic fabric of  claim 1 , comprising at least 60% of biopolyamide yarn and at least 5% of elastane yarn. 
     
     
         6 . The bielastic fabric of  claim 1 , having jersey stitch or interlock stitch. 
     
     
         7 . The bielastic fabric according to  claim 1 , having a basis weight of 100-250 g/sqm, 40-200% of elasticity in the weft and 30-200% of elasticity in the warp. 
     
     
         8 . The bielastic fabric of  claim 7 , comprising 75-90% of biopolyamide yarn and 10-25% of elastane yarn, and having jersey stitch, a basis weight of 180-210 g/sqm, 45-90% of elasticity in the weft and 35-80% of elasticity in the warp, or
 comprising 75-90% of biopolyamide yarn and 10-25% of elastane yarn, and having jersey stitch, a basis weight of 100-140 g/sqm, 120-200% of elasticity in the weft and 120-200% of elasticity in the warp, or   comprising 75-90% of biopolyamide yarn and 10-25% of elastane yarn, and having interlock stitch, a basis weight of 160-200 g/sqm, 110-190% of elasticity in the weft and 50-100% of elasticity in the warp.   
     
     
         9 . The bielastic fabric of  claim 8 , comprising 80-90% of biopolyamide yarn and 10-20% of elastane yarn, and having jersey stitch, a basis weight of 190-200 g/sqm, 50-80% of elasticity in the weft and 45-70% of elasticity in the warp, or comprising 70-80% of biopolyamide yarn and 20-30% of elastane yarn, and having jersey stitch, a basis weight of 110-130 g/sqm, 140-180% of elasticity in the weft and 140-180% of elasticity in the warp, or
 comprising 70-80% of biopolyamide yarn and 20-30% of elastane yarn, and having interlock stitch, a basis weight of 170-190 g/sqm, 130-180% of elasticity in the weft and 60-90% of elasticity in the warp.   
     
     
         10 . A process of manufacturing the bioelastic fabric of  claim 1 , comprising the steps of:
 a) stitching biopolyamide yarn and elastane yarn to obtain a fabric,   b) heat-setting said fabric at a temperature not higher than 160° C. over a time period not higher than 100 seconds; and, optionally,   c) dyeing the fabric thus heat-set.   
     
     
         11 . The process of  claim 10 , wherein the heat-setting step b) is carried out over a time period of 30-70 seconds. 
     
     
         12 . The process of  claim 10 , wherein the heat-setting step b) is carried out at a temperature of 100-160° C. 
     
     
         13 . The process of  claim 10 , wherein the dyeing step c) comprises the following substeps:
 i) scouring at 80-100° C. for 10-20 minutes,   ii) neutralizing of the scouring at 50-70° C. for 5-20 minutes, preferably at 60° C. for 10 minutes,   iii) dyeing, with dye dosage for 15-30 minutes at 90-110° C. with permanence for 20-40 minutes, preferably for 24 minutes at 98° C. with permanence for 30 minutes,   iv) stripping at 30-50° C. for 5-20 minutes, preferably at 40° C. for 10 minutes,   v) treating with a fixer at 50-90° C. for 10-30 minutes, preferably at 70° C. for 20 minutes, and   vi) final cold washing.   
     
     
         14 . A bielastic fabric obtainable by the process of  claim 10 , comprising biopolyamide yarn and elastane yarn. 
     
     
         15 . A clothing or furniture item, at least partially made of the bielastic fabric of  claim 1  or with the fabric of  claim 14 . 
     
     
         16 . A process of manufacturing a bielastic fabric comprising biopolyamide yarn and elastane yarn, said process comprising the steps of:
 a) stitching biopolyamide yarn and elastane yarn to obtain a fabric,   b) heat-setting said fabric at a temperature not higher than 160° C. over a time period not higher than 100 seconds; and, optionally,   c) dyeing the fabric thus heat-set.   
     
     
         17 . The process of  claim 16 , wherein the heat-setting step b) is carried out over a time period of 30-70 seconds. 
     
     
         18 . The process of  claim 16 , wherein the heat-setting step b) is carried out at a temperature of 100-160° C. 
     
     
         19 . The process of  claim 16 , wherein the dyeing step c) comprises the following substeps:
 i) scouring at 80-100° C. for 10-20 minutes,   ii) neutralizing of the scouring at 50-70° C. for 5-20 minutes,   iii) dyeing, with dye dosage for 15-30 minutes at 90-110° C. with permanence for 20-40 minutes,   iv) stripping at 30-50° C. for 5-20 minutes,   v) treating with a fixer at 50-90° C. for 10-30 minutes, and   vi) final cold washing.   
     
     
         20 . A heat-set bielastic fabric obtainable by the process of  claim 16 , comprising biopolyamide yarn and elastane yarn, said fabric having a basis weight 10 of 100-250 g/sqm, 40-200% of elasticity in the weft and 30-200% of elasticity in the warp.