Balloon theory of yarn during unwinding from packages

Abstract

Yarn unwinding from a package is a key problem in many textile processes, such as weft insertion and warping. Stability of the unwinding has a direct influence on the efficiency of the entire textile process and the quality of the final product. The quality of the yarn is numerically expressed mainly in terms of mechanical quantities. In the unwinding process, viscoelastic properties are the most important. They depend on how the yarn is stressed. The quality of the yarn that is being unwound should not be reduced, unless this reduction does not significantly lower the quality of the fabric. We strive to achieve as large warping and weaving speeds as possible; therefore, our aim is to improve the theory of cross-wound package unwinding and to find the necessary modifications of the yarn unwinding process. The goal of our contribution is to state the equations of motion that describe the unwinding yarn.

Determining the dependences for calculating a conversion scale of profile height of the controlled packing surface

“…In the device from [6], a source of illumination is the laser beam that scans a bobbin surface, which allowed a considerable increase in resolution.…”

“…The device described in [6] is the development of systems based on scanning the image of a bobbin by the laser beam, such as Beltro-Lis [7], manufactured by Barmag AG (Germany). The system records the presence of torn elementary threads, stains and dirt, as well as controls the contours of packings.…”

A dynamic modeling approach to the moving filament during high-speed winding by absolute nodal coordinate formulation

“…Because the equations are expressed in a (nonuniformly) rotating observation frame, they can be used to describe yarn unwinding from stationary packages. 16 Pracek et al 17 deduced the differential equation of motion for yarn unwinding on a cylindrical surface, which can be applied to the analysis of yarn unwinding in the textile process. However, limited research has been found around the polyester filament winding process.…”

An analytical approach of filament bundle swinging dynamics, Part I: Modeling filament bundle by ANCF

“…The quality of yarn is affected by many factors, such as high-frequency vibration, 5 friction forces, 6 and air resistance. 7 The dynamics simulation is an important means to understand yarn dynamic behavior. The viscoelasticity of yarn, gravity, and air resistance are three important roles that affect yarn's dynamic behavior, and they should be given full consideration.…”

“…In recent years, the dynamic behavior of yarn has been studied more and more deeply. Pracˇek and Pusˇnik 6 and Pracˇek et al 7 set up a yarn motion equation to analyze the stress of the yarn during the unwinding process of stress, taking into account the Coriolis force, the centripetal force, and the Euler force, but the influence of yarn cross-section diameter, gravity, and tangential air resistance were not considered. Hossain et al 10 analyzed the kinematic characteristics of the yarn in the spinning process.…”