Development of Viloft Fiber Double-Layer Warm Fabric
In order to improve the warmth retention of fabric,the morphological characteristics,physical indexes,and yarn indexes under identical processing parameters of Viloft fiber are compared with those of cotton fiber,Lyocell fiber,modal fiber,and bamboo pulp fiber.Based on the characteristics of the fiber and yarn,a double-layer warm fabric is designed and developed.The technology and technical difficulties in the processes of winding,warping,sizing,and wea-ving of Viloft fiber compact yarn are elaborated.The performance indexes of five double-layer fabrics with the same specifications are analyzed and compared.It is pointed out that the flat strip-like shape and continuous groove structure on the surface are the most significant differ-ences between Viloft fiber and cotton fiber,Lyocell fiber,modal fiber,and bamboo pulp fiber.When warping Viloft fiber yarn,attention should be paid to the uniformity of tension to reduce unexpected broken ends.The viscosity of the sizing paste should be designed to be slightly low-er,and an appropriate drying temperature should be selected based on the sizing speed to ensure a moisture regain of no less than 12％,thereby reducing yarn broken ends and hairiness.By ad-justing the height of the heald frame,the warp yarn tension,and height of the warp roller,the uneven weft density of the Viloft fiber fabric surface can be improved.When the yarn linear density and fabric specifications are the same,the Viloft fiber fabric exhibits superior air perme-ability,moisture permeability,and warmth retention performance compared to the other four fabrics.
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