Effects on the Stability of the Balloon Shape in the Covered Yarn Process

Abstract

In the process of producing covered yarn, a single outer wrapping yarn forms a balloon when it rotates at high speed. In this work, we used a mathematical model of a balloon formed by polyamide,which is a common outer wrapping yarn, and verified its feasibility with a group of experimental data. The effects of yarn tension, rotation speed, balloon height and turntable radius on the balloon shape were analysed and the correctness simultaneously demonstrated.

A study on the unwinding tension control of an elastic yarn

“…In Equation (10), n ¼ ða 2 x 2 =aÞ 1=b . As the dimensionless F g and V s are very small, they are ignored.…”

“…During the production of the covered yarn, Feng et al 10 established a balloon model of the yarn unwinding in order to analyze the influence of the yarn tension, speed, balloon height, and turn-table radius on the balloon shape. Feng et al 11 studied the relationship between the draft ratio of the covered yarn and the yarn tension and proposed a new type of covered yarn system that could control the stretching tension of the spandex elastic yarn.…”

“…During the production of the covered yarn, Feng et al. 10 established a balloon model of the yarn unwinding in order to analyze the influence of the yarn tension, speed, balloon height, and turn-table radius on the balloon shape. Feng et al.…”

Development of a Small, Covered Yarn Prototype

“…C o vered yarn is outer cover yarn that is wrapped on inner corn yarn in a spiral winding manner to form a new yarn with better performance [1][2]. The covered yarn produced by this new technology generally possesses a higher strength, richer appearance, and fl uffi er structure with less hairiness [3][4][5]. Currently, production equipment for covered yarn is generally large-scale equipment.…”