Physical Properties and Wear Comfort of Bio-Fiber-Embedded Yarns and their Knitted Fabrics According to Yarn Structures

This study examined the physical properties of polytrimethylene terephthalate (PTT)/Tencel/cotton air vortex yarns and the wear comfort of their knitted fabrics for high emotional garments. In fine yarn count, the initial modulus of the air vortex yarn was similar to the ring yarn because of the elastic property of the PTT fibers in the yarns. In particular, the thermal shrinkage of the air vortex yarns was higher than that of the ring yarns because of the sensible thermal shrinkage of the PTT fibers, which resulted in higher relaxation shrinkage of the air vortex knitted fabric than those of ring and compact knitted fabrics. On the basis of the wear comfort, the air vortex yarns are compatible with winter textile goods. The pilling of the air vortex knitted fabric was superior to that of the ring and compact yarns. The tactile hand of the air vortex yarn knitted fabrics was stiffer than that of the ring and compact yarn knitted fabrics. However, the harsh tactile hand of the air vortex knitted fabric was estimated to improve in the thinner fabrics by the low elastic modulus of fine yarn because of the PTT fibers in the air vortex yarns.

Investigation of Manufacturing and Processing Techniques on Shade Variation and Performance Characteristics of Woven Fabrics

The purpose of this research is to examine the properties of vortex and ring spun yarns and their influence on the properties of woven fabrics. Cotton/PET fibers with the same blend ratio were used to produce vortex and ring spun yarns of 24.6 tex. These yarns were woven into a fabric with a satin weave construction. Heat setting was done to control the dimensional shrinkage and its effect on results was investigated. The woven fabric was dyed using exhaust and continuous dyeing methods. The vortex yarn fabric yields superior shade depth, pilling and fastness properties in comparison to the ring yarn fabric.

The influence of air-jet and vortex yarn on functionality of woven fabric

The basic intention of the research is to analyse the influence of air-jet and vortex yarn structure on woven fabric functionality. With the research, the air-jet and vortex yarn from the mixture of 65 % PES / 35 % CO fibres and fineness 20 tex were analysed. For comparison, the conventional ring-spun yarn was chosen from the mixture of 65 % PES/35 % CO fibres and fineness 20 tex. The woven fabric in the twill weave T1/3Z was produced from the air-jet, vortex and ring-spun yarn in the weft direction with two different weft densities (20 and 30 yarns per cm). In the first part of the study, the structure, physical and mechanical properties of the air-jet, vortex and ring-spun yarn were analysed, while in the second part of the research, the influence of used yarn in the weft direction on the functionality of woven fabric was studied. The research was focused mainly on physical, mechanical properties as well as permeability properties of woven fabric with air-jet and vortex yarn in the weft direction in comparison with woven fabric with conventional ring-spun yarn in the weft direction, with equal chemical composition and fineness of yarn. The research results was shown which yarn structure in the weft direction of woven fabric (air-jet or vortex) the most closely approximates the characteristics of the ring-spun yarn, which has because of ring-traveller-spindle mechanism ideal and the most even structure, mainly because of the insertion of the true twist.

Properties Of Viscose Vortex Yarns Depending On Technological Parameters Of Spinning

This paper analyzes the relationship between technological parameters of spinning of 100% CV Vortex yarns of different counts and its selected geometrical parameters (a lead of helix of wrapping fibre ribbon, yarn diameter) as well as yarn properties. The number of twist of wrapping fibre layer is determined. The effect of the yarn delivery speed, hollow spindle diameter, and the main draft on the hairiness, mass irregularity, tenacity, elongation, resistance to abrasion and bending rigidity of Vortex yarn is observed. The yarn properties are compared with the properties of open-end rotor spun yarns. Slivers of the same spinning lot were used for the production of both kinds of yarn. The results showed that the delivery speed in combination with spindle diameter affects yarn diameter, hairiness and abrasion resistance. Mass irregularity and imperfections of yarn is mainly affected by the main draft of drafting unit. Technological parameters of spinning do not affect the level of bending rigidity of the Vortex yarn. Tested rotor spun yarns had a larger diameter, higher hairiness, lower tenacity and higher elongation, lower mass irregularity and number of imperfections, higher abrasion resistance and lower bending rigidity compared to tested Vortex spun yarns.

Influence of Spindle Air Pressure and its Direction on the Quality Characteristics of Polyester/Cotton Vortex Yarn

The influence of spindle air pressure and its direction on the properties of Polyester/Cotton vortex yarn was studied. The spindle air pressure direction was changed in both Z and S directions on the Z twist yarn of Ne 40s Polyester/Cotton vortex yarn (50:50 polyester: cotton) and these yarns were then tested for their properties such as tensile, unevenness, and hairiness. It was found that unevenness was lower with normal spinning condition and increased when the spindle air pressure increased in both directions. Imperfections were also found to be minimum with normal spinning condition and increased with increase in spindle air pressure. The yarn tenacity and elongation at break found to be lower at normal spinning condition. When the spindle air pressure increased yarn tenacity and elongation at break also increased with increase in spindle air pressure. At the same time spindle air pressure in the same direction of basic yarn twist gave less increase in tenacity and elongation than opposite direction of basic yarn twist. Hairiness index, H and hairiness in different length classes continuously increased as the spindle air pressure increased in opposite direction of basic yarn twist.

Designing the Spindle Parameters of Vortex Spinning by Modeling the Fiber/Air Two-Phase Flow

Vortex spinning is a novel technology which produces short-staple yarns by utilizing high-speed swirling airflow. The structure of the spindle plays an important role in vortex spinning in terms of its effect on the resulting yarn properties. In this paper, a two-dimensional fluid-structure interaction (FSI) model for the fiber/air two-phase flow is presented to design the two spindle parameters—the spindle cone angle and spindle diameter by evaluating their effects on the fiber dynamics in the flow field inside the twisting system and the resulting yarn tenacity. The coupling between the fiber and airflow is solved and the motional characteristics of the fiber are obtained. It is found that the fiber moves downstream in a varying wavy shape and its spreaded trailing portion is then in a helical motion to form the yarn. The results also show that the increase of the spindle cone angle has a negative effect on the tenacity of the produced vortex yarn. The increased spindle diameter gives rise to the decreased vortex yarn tenacity. The numerical results can provide an explanation for the experimental results reported by previous studies.