Method for manufacturing flame-retardant bulky fiber without flame retardant on fully-drawn yarn (FDY) machine

A method for manufacturing a flame-retardant bulky fiber on an FDY machine, 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 the 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;
• and the method comprises the following steps:
• S1:
• slicing and drying a polyester masterbatch;
• S2:
• spinning through a spinning die, and then cooling by side blowing;
• S3:
• cooling and oiling;
• S4:
• drawing by the first hot roller, wherein the first hot roller has the temperature of 80° C. to 88° C. and a speed of 1,850 m/min to 1,980 m/min;
• S5:
• drawing and shaping by the second hot roller, wherein the second hot roller has the temperature 30° C. to 50° C. higher than the temperature of the first hot roller and a speed of 3,600 m/min to 5,600 m/min;
• and
• S6:
• winding.

A method of using 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 the 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;
• a home textile is manufactured by using the flame-retardant bulky fiber.