INFLUENCE OF CONTROLLED PRETENSION OF THE CORE ON THE HAIRINESS OF COTTON NYLON, CORE-SPUN YARNS.

Cotton/nylon, core-spun yarns were prepared at different twist multiplier under controlled pretension of the core without changing the double rove feeding, filament disposition, spindle feed, and traveler count. The hairiness of the core-spun yarn, made of a nylon core and a J-34 cotton sheath, was compared to equivalent 100 percent cotto..

Strength of Polyester.

Researchers derived a formula to predict the yarn strength of polyester yarns based on fiber tensile strength, fiber bundle strength, and yarn unevenness. The strength realization percentage of fibers is a simple ratio relating yarn strength to the average strength of component fibers contained in the yarn cross section and is a measure o..

A Model of Fibre Migration in Staple-Fibre Yarn.

Researchers using a new staple fiber migration modeling technique based on the Markov process analyzed such yarn structure features as irregularities in fiber disposition, evenness, and hairiness. The new technique defined the path of individual fibers in yarn cross sections within a three dimensional space. Tests showed that fiber migrat..

Influence of Yarn Structural Parameters on Rotor Spun Yarn Properties.

An investigation into the influence of various structural parameters on the tensile properties of rotor spun yarns determined the correlations of incidence of wrappers per unit length of yarn, average length of wrapped zone, and average number of wraps in a wrapper zone with count strength percentage, tenacity, extension at break, and yar..

Internal Structure and Properties of DREF-3 Yarns.

Researchers used tracer fiber techniques to analyze the internal structure of cotton yarns spun on the DREF-3 system using various spinning drum speeds, delivery speeds, and throttle diameters. Core Fibers had a twisted rather than a parallel configuration. Faster delivery speeds increased fiber extension, reduced twist levels, and reduce..

Weak Point Analysis on Rotor Yarns.Ⅰ.

Experiments used an add-on module on the Uster Tensojet to calculate the stress-strain curves for weak points in rotor spun yarns. Based on a macroscopic analysis of break points, tensile testing reconstructed the deformation experienced by the yarn under load, enabling the interpretation of breaking behavior caused by weak points introdu..

A Study on Improving the Breaking Elongation of Cotton Yarn.

Indian cotton yarn exporters need to consider such quality factors as breaking elongation. Many importing countries specify a breaking elongation between 5-5.5 percent, whereas the value for most Indian cotton yarn is between 4-4.45 percent. Experiments using several varieties of cotton evaluated factors that affect breaking elongation. S..

A Study on the Formation of Yarn Hairiness.

Researchers examined the dynamic process of yarn hairiness formation in worsted ring spinning. A special CCD camera observed fiber behavior in the spinning triangle. A series of photographs demonstrated the formation mechanisms of leading, trailing, looped, and wild hairs. Most of the results agreed with prior research on the mechanisms i..

Modelling of Yarn Properties from Fibre Properties.

Researchers developed a new method to predict the properties of yarns from those of their component fibers. The new method consisted of choosing a yarn extension, determining the required mechanical and radial forces of this extension, and calculating the frictional force to maintain the yarn structure. The method was then repeated until ..

Practical problem solving in the spinning mill (German)

The desire to maintain the sliver attenuation and fibre parallelisation processes necessary for producing fine yarns while producing a distinctive, self-contained nep yarn with good nep attachment means a degree of compromise is needed. Recently impetus has been generated for reaching the ideal solution of incorporating neps immediately b..