INFLUENCE OF TWIST ON SELECTED PROPERTIES OF MULTIFILAMENT YARN
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
AUTEX, Technical University of Lodz,
Abstract
Owing to twisting of filament fiber bundle, the structure and consequently various parameters and properties of a
fiber bundle are changed. The aim of the work is to verify the effect of multifilament yarn twist (or twist coefficient)
on selected mechanical properties such as multifilament tenacity, breaking elongation, and coefficient of fiber stress
utilization in the yarn. Furthermore, the influence of twist on structural parameters such as the angle of peripheral
fibers, the packing density, and the substance cross-sectional area of fiber bundle is observed. Two multifilament
yarns with different filament cross-section shape and material were used for the experiment. Experimentally obtained
data was compared with the known model dependencies derived decades ago based on the helical model. It can be
stated that multifilament yarn retraction can be predicted based on the angle of peripheral fibers using the Braschler’s
model. The coefficient of fiber stress utilization in the multifilament yarn determined experimentally corresponds
with a theoretical curve, constructed according to Gégauff and Neckář, in the area of Koechlin’s twist coefficient
α > 54 ktex1/2 m−1. Results as well as possible causes of deviations of experimental data from the theoretical one
are discussed in this work.
Description
Subject(s)
Multifilament yarn breaking tenacity, multifilament yarn breaking elongation, helix model, twist, packing density, yarn retraction
Citation
ISSN
1470-9589