Influence of Overfeed and Twist on Fancy Yarns Structure

Abstract

In this study the design of fancy yarns and structural indices of fancy yarns such as the height of the effects, the width of the effects, distances between effects and number of effects per unit length of fancy yarns are investigated. The researched fancy yarn structural indices depend on the overfeed, that is determined by the speed of supply of the effect yarn and the delivery speed of fancy yarns upon the fancy yarn twist, which is determined by the rotational speed of a hollow spindle. It was calculated minimum and maximum values of structural indices and their limits of variation. The fancy yarns structural indices primarily depend on overfeed. With increase of this factor the values of the height and the width of the effects, number of effects per unit length are increasing too. In that case distances between effects decrease.