US 12,258,687 B2
Method for manufacturing flame-retardant bulky fiber without flame retardant on fully-drawn yarn (FDY) machine
Shunlin Cao, Kunshan (CN); Qionghua Cai, Kunshan (CN); Guochuang Zhang, Kunshan (CN); and Xuewen Lou, Kunshan (CN)
Assigned to KUNSHAN YIJIA JU TEXTILE CO., LTD., Kunshan (CN)
Appl. No. 17/602,745
Filed by KUNSHAN YIJIA JU TEXTILE CO., LTD., Kunshan (CN)
PCT Filed Dec. 25, 2019, PCT No. PCT/CN2019/128277
§ 371(c)(1), (2) Date Oct. 9, 2021,
PCT Pub. No. WO2020/207056, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 201910282234.2 (CN), filed on Apr. 9, 2019.
Prior Publication US 2022/0195640 A1, Jun. 23, 2022
Int. Cl. D02G 3/44 (2006.01); D01D 5/16 (2006.01); D02G 3/24 (2006.01)
CPC D02G 3/443 (2013.01) [D01D 5/16 (2013.01); D02G 3/24 (2013.01); D10B 2331/04 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A flame-retardant bulky fiber, wherein the flame-retardant bulky fiber is formed by winding a plurality of spiral yarns arranged in the same direction; and the plurality of spiral yarns are polyester yarns with a fineness of 0.52 DPF to 80 DPF, the flame-retardant bulky fiber is manufactured by one-step spin-drawing on an FDY machine at a drawing ratio of 1.6 to 2.6, the one-step spin-drawing is performed by a first hot roller and a second hot roller, the first hot roller has a temperature of 80° C. to 88° C., and the second hot roller has a temperature 30° C. to 50° C. higher than the temperature of the first hot roller; the flame-retardant bulky fiber has a limiting oxygen index (LOI) of 26% or more; the flame-retardant bulky fiber does not comprise a flame retardant.