Warp knitted fabric comprising polytrimethylene terephthalate and method of making same
View Patent ↗This invention relates to warp knit fabric having a locknit pattern comprising polytrimethylene terephthalate yarn and elastic yarn having a weight ratio of from 70:30 to 90:10. The fabrics have a soft hand feel, better colorfastness after chlorine exposure and UV radiation as compared to other performance wear fabrics containing elastic yarn polyethylene terephthalate yarn.
1. A warp knit fabric having a locknit pattern comprising:
polytrimethylene terephthalate (PTT) yarn having a total fineness in the range of 30-75 deniers; and
elastic yarn having a total fineness in the range of 20-70 deniers and an elongation at break greater than 100%;
wherein the warp knit fabric having a locknit pattern comprises:
(a) a weight ratio between the PTT yarn and the elastic yarn in the range of 70:30 to 90:10;
(b) a course density in the range of 15-35 courses/cm and a basis weight in the range of 180 g/m2 or greater;
(c) an elongation in the range of 120% to 185% in the warp direction and an elongation in the range of 80% to 150% in the weft direction; and
(d) wherein the elastic yarn has a total draft ranging from 2.6 to 4.0 times as calculated by equation (1):
TD e =BD e ×[RI ptt /RI e ]×LK×SD (1)
where
TD e : total draft of the elastic yarns;
BD e : beam draft of the elastic yarns is 1.7 times;
RI ptt : run-in length of the PTT yarns ranges from about 1400-2000 mm/rack;
RI e : run-in length of the elastic yarns ranges from about 200-1000 mm/rack;
LK: locknit pattern run-in ratio is 1.33; and
SD: spool draft of the elastic yarns is 1.0 time.
2. The warp knit fabric of locknit pattern according to claim 1 , which has a course density of 20-30 courses/cm and a basis weight of about 180-250 g/m2.
3. The warp knit fabric of locknit pattern according to claim 1 wherein the total draft of the elastic yarns is in the range of 2.8 times to 3.6 times.
4. The warp knit fabric of locknit pattern according to claim 1 wherein the total draft of the elastic yarns is in the range of 3.0 times to 3.4 times.
5. The warp knit fabric of locknit pattern according to claim 1 wherein the ratio of RI ptt :RI e is greater than 2.0.
6. The warp knit fabric of locknit pattern according to claim 1 , wherein the ratio of RI ptt :RI e is in the range of 2.2 to 2.8.
7. A garment comprising the warp knitting fabric of locknit pattern according to claim 1 .