Air-Jet Texturing of Spun Cotton Yarns for Improved Comfort

1992 ◽  
Vol 62 (3) ◽  
pp. 169-174 ◽  
Author(s):  
J. Srinivasan ◽  
A. K. Sengupta ◽  
V. K. Kothari
Keyword(s):  
Length Distribution ◽  
Fiber Length Distribution ◽  
Air Jet ◽  
Air Stream ◽  
Spun Yarn ◽  
Fiber Fineness ◽  
Fiber Packing Density ◽  
Spun Yarns ◽  
Cotton Yarns ◽  
And Migration

We have studied the importance of yarn structural variants such as fiber packing density, fiber fineness and length distribution, mean fiber extent, and migration parameters in deciding the bulking potential of a spun yarn structure with air-jet texturing. Three variants of carded yarns, combed yarns, and yarns made from combed sliver which is again carded in both 100% spun and composite spun forms with three different twist levels show that fiber-to-fiber distance and frictional hindrance may have a significant influence on the relative local velocities of the fibers in the turbulent air stream, which would affect the texturing behavior. We have observed that spun yarns with uniform fiber length distribution, higher fiber extent, and more fiber parallelization, such as combed yarns, have less bulk during texturing. Yarns with higher packing and migration have higher frictional hindrance with less fiber-to-fiber distance. They are therefore subjected to reduced flow asymmetry and produce yarns with reduced bulk.

A Computer Simulation Approach for Engineering Air-Jet Spun Yarns

1997 ◽  
Vol 67 (3) ◽  
pp. 223-230 ◽  
Author(s):  
Rangaswamy Rajamanickam ◽  
Steven M. Hansen ◽  
Sundaresan Jayaraman
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Fiber Length ◽  
Experimental Investigations ◽  
Simulation Approach ◽  
Air Jet ◽  
Fiber Fineness ◽  
Spun Yarns ◽  
Yarn Count ◽  
Wrap Angle

A computer simulation approach for engineering air-jet spun yarns is proposed, and the advantages of computer simulations over experimental investigations and stand-alone mathematical models are discussed. Interactions of the following factors in air-jet spun yarns are analyzed using computer simulations: yarn count and fiber fineness, fiber tenacity and fiber friction, fiber length and fiber friction, and number of wrapper fibers and wrap angle. Based on the results of these simulations, yarn engineering approaches to optimize strength are suggested.

scholarly journals Study on Fiber Overlap and Fiber Extent in Blended Spun Yarns

2013 ◽  
Vol 8 (1) ◽  
pp. 155892501300800
Author(s):  
Biswa Ranjan Das ◽  
S. M. Ishtiaque ◽  
R. S. Rengasamy
Keyword(s):  
Statistical Analysis ◽  
Structural Parameter ◽  
Significance Level ◽  
Yarn Strength ◽  
Air Jet ◽  
Spun Yarn ◽  
Spun Yarns

This article reports on the analysis of the fiber overlap and fiber extent in ring, rotor, and air-jet spun polyester/viscose blended yarns. The fiber overlap and fiber extent was measured by employing the tracer fiber technique. Statistical analysis was carried out at the 95% significance level with the single tail test to trace out specific trends executed by the spun yarns with any change in their blend proportions. The fiber overlap index and spinning-in-coefficient is correlated with tensile characteristics (static and dynamic) of the spun yarns to explore the most influential structural parameter among them for different applications. This presents study indicates that the prediction of spun yarn performance in post spinning processes is more appropriately modeled based on fiber overlap index over spinning-in-coefficient for ring and air-jet spun yarns, whereas spinning-in-coefficient is more appropriate for rotor spun yarns. For apparel use, spinning-in-coefficient is more appropriate over fiber overlap index for rotor and air-jet yarns to model the spun yarn strength as opposed to fiber overlap index for ring spun yarns.

Air and Ring Combination in Tandem Spinning

1997 ◽  
Vol 67 (3) ◽  
pp. 217-223 ◽  
Author(s):  
A. P. S. Sawhney ◽  
L. B. Kimmel
Keyword(s):  
Spindle Speed ◽  
Optimum Level ◽  
Ring Spinning ◽  
Air Jet ◽  
Yarn Twist ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Ring Spun Yarn ◽  
Twist Level ◽  
Air Nozzle

With the objective of boosting ring spinning productivity, a new tandem spinning system combining air-jet and ring spinning technologies in continuous tandem is investigated. In this “air-plus-ring” tandem spinning system, a drafted roving strand as it emerges from the front roller nip feeds into a single- or dual-jet air nozzle where it is subjected to a vortex of compressed air, producing a pneumatically entangled, false-twisted, partially strengthened strand. This so-called prefabricated, air-bolstered strand continuously feeds into a standard ring spinning zone and is ultimately spun into a novel, single-component yarn. By spinning a few cotton and cotton-blend yarns with the lowest practical twist levels possible on both the tandem and conventional ring spinning systems, we show that a tandem spun yarn can be produced with a relatively lower (true ring) twist level than a pure ring spun yarn. To an extent, the tandem spinning's air-bolstering action reinforces the drafted fibrous strand, contributing to yarn formation and hence character. Since ring spinning productivity is inversely proportional to yarn twist level, the relatively lower twist level required in tandem spinning allows a proportionately higher yarn production speed (in some cases, up to 50% faster than the conventional ring spinning), while maintaining spindle speed at the traditional, optimum level imposed by the limiting traveler speed. Tandem spun yarns, however, are somewhat different from, and generally weaker than, conventional ring spun yarns. This paper briefly describes a prototype of the new tandem spinning system developed on a laboratory Spintester, and shows spinning parameters and properties of a few yarns produced on both the tandem arid conventional ring spinning systems, each employing the traditional (maximum) optimum spindle speed of 10,000 rpm for a given 5.0 cm (2 inch) diameter ring.

scholarly journals A Study on the Twist Loss in Weft Yarn during Air Jet Weaving

2017 ◽  
Vol 12 (4) ◽  
pp. 155892501701200
Author(s):  
Muhammad Umair ◽  
Khubab Shaker ◽  
Yasir Nawab ◽  
Abher Rasheed ◽  
Sheraz Ahmad
Keyword(s):  
Woven Fabric ◽  
Weft Yarn ◽  
Air Jet ◽  
Yarn Twist ◽  
Spun Yarns ◽  
Cotton Yarns ◽  
Subsequent Effect ◽  
Fabric Production ◽  
Twill Weave

Air jet weaving is considered to be the most advanced method of fabric production in which weft yarn is inserted with air pressure. But due to very high pressure some of yarn twist is lost during fabric production. This affects the strength of the yarn in general and quality of the fabric in particular. This study deals with the parameters affecting twist loss in weft yarn during air jet weaving. The subsequent effect of twist loss on the mechanical properties of yarn as well as fabric is also studied. A total of twenty-four different fabric samples were produced to consider the effect of yarn linear density, material, weave design and fabric width on the twist loss in picking and receiving sides of the woven fabric. The 100% cotton and polyester-cotton (PC) ring spun yarns having linear densities 37, 27 and 15 tex were used to produce fabrics in two different weaves i.e. 1/1 plain and 3/1 twill weave. In addition, two different fabric widths i.e. 121 and 100 cm were produced. The twist loss increases with increase in the fineness of yarn. In PC yarns twist loss percentage was higher as compared to cotton yarns. Twist loss in wider width was higher as compared to smaller widths of the fabric, while the effect of weave design was negligible.

scholarly journals Development of a process chain for the production of high-performance 100% metal spun yarns based on planed metal staple fibres

2020 ◽  
Vol 2 (8) ◽  
Author(s):  
Erik Schmidt ◽  
Mir Mohammad Badrul Hasan ◽  
Anwar Abdkader ◽  
Chokri Cherif
Keyword(s):  
High Performance ◽  
Length Distribution ◽  
Fibre Length ◽  
Staple Fibre ◽  
Production Costs ◽  
Process Chain ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Spinning Process ◽  
Cut Resistance

AbstractThe high potential of metal fibres for various technical applications including filtration, electrical, heat and cut resistance or composite applications is still not fully exploited due to their high production costs. This paper presents the development of a new process chain for spinning 100% metal spun yarns from planed metal staple fibres as an alternative to conventional metal fibres. The developed spinning process chain begins with a stretch breaking process to create metal staple fibre sliver with a narrow fibre length distribution and defined mean fibre length. Next, a drafting process on a draw frame is performed in order to produce highly uniform metal staple fibre sliver. This is the basis for the development of a flyer spinning process to realise high-performance metal spun yarn. Finally, the fundamental relationships between fibre properties, processing characteristics, semi-finished product properties and the performance of the resulting metal spun yarns are described in detail.

scholarly journals Optimising the Production Process of Rieter Air Jet Spun Yarns and a Model for Prediction of their Strength

2018 ◽  
Vol 26 (1(127)) ◽  
pp. 36-41 ◽  
Author(s):  
Iwona Frydrych ◽  
Ali Demir
Keyword(s):  
Structural Parameters ◽  
Multiple Regression Model ◽  
Gauge Length ◽  
Response Surfaces ◽  
Yarn Strength ◽  
Air Jet ◽  
Spun Yarn ◽  
Nozzle Pressure ◽  
Spun Yarns ◽  
Theoretical Results

In this study, the effect of yarn linear density, delivery speed and nozzle pressure on Rieter air jet spun yarn strength was investigated. A multiple regression model was used to study the combined effect of these parameters and response surfaces were obtained. Results showed that by increasing the nozzle pressure, the yarn tensile strength improves till a specific limit, then it deteriorates afterwards. Based on the different combinations of processing variables, optimal running conditions were obtained. Along with the experiment, a mathematical model that predicts air jet spun yarn strength at a short gauge length has been presented. Fibre parameters in addition to yarn structural parameters were used to obtain the theoretical yarn strength. The results showed a satisfactory agreement between the experimental and theoretical results.

scholarly journals A Comparative Study of Hooks in the Ya Rns Produced by Different Spinning Technologies

2015 ◽  
Vol 15 (4) ◽  
pp. 260-265
Author(s):  
Anindya Ghosh ◽  
Subhasis Das ◽  
Prithwiraj Mal
Keyword(s):  
Comparative Study ◽  
Air Jet ◽  
Reverse Trend ◽  
Spun Yarn ◽  
Spun Yarns

AbstractThis article presents a comparative study of hooks’ characteristics of ring, rotor, air-jet and open-end friction spun yarns. Hook types and their extent, spinning in-coefficient and mean fibre extent in the yarns produced on different spinning technologies are investigated. The results show that the hook extents for open-end friction spun yarn are the highest followed by rotor, ring and air-jet spun yarns. Ring and air-jet spun yarns have higher percentage and extent of trailing hook as compared with leading hook, whereas, rotor and friction spun yarns show the reverse trend.

Fiber packing density in the cross-section of low torque ring spun yarn

2016 ◽  
Vol 88 (2) ◽  
pp. 191-202 ◽  
Author(s):  
Ying Guo ◽  
Xiaoming Tao
Keyword(s):  
Cross Section ◽  
Packing Density ◽  
Compact Structure ◽  
Axial Tension ◽  
Spun Yarn ◽  
Fiber Packing Density ◽  
Spun Yarns ◽  
Ring Spun Yarn ◽  
The Cross ◽  
Low Torque

Fiber packing density in the yarn cross-section is one of the major parameters that reflect the yarn internal structure and its final properties. Taking the novel low torque ring spun yarn as the object, this work studied the fiber packing density of low torque ring spun yarns and conventional ring spun yarns under various axial tensions. With the increase of tension, the change of fiber packing state in low torque ring spun yarns and conventional ring spun yarns was compared qualitatively. In this study, fiber distribution in the cross-section of both Tencel yarns and wool yarns was carried out. The results show that, under the same axial tension, the packing density of fibers of low torque ring spun yarn is much higher than that of conventional ring spun yarn. The axial tension has greater influence on the fiber packing density for the conventional ring spun yarn. From the experimental results, in low torque Tencel yarn, the fiber packing density nearly reaches 0.9, which is the maximum value for close-packed yarn. Due to different fiber properties and yarn structure, it is difficult to form a close packing for fibers in low torque ring wool yarns. The current results indicate that low torque ring spun yarn has a more compact structure than conventional ring spun yarn. Compared with conventional ring spun yarns with the same count and twist levels, in low torque ring spun yarns, more fibers contribute to the yarn breaking strength.

Air-Jet Texturing of Spun Cotton Yarns for Improved Comfort

1992 ◽  
Vol 62 (1) ◽  
pp. 40-43 ◽  
Author(s):  
J. Srinivasan ◽  
A. K. Sengupta ◽  
V. K. Kothari
Keyword(s):  
Flexural Rigidity ◽  
Twist Angle ◽  
Air Pressure ◽  
Air Jet ◽  
Reduced Modulus ◽  
Spun Yarns ◽  
Cotton Yarns ◽  
Structural Configurations

We have studied air-jet texturing of spun yarns with different structural configurations. After texturing, the yarns have improved bulk and reduced modulus and flexural rigidity, rendering them more suitable for improved comfort applications. Increased bulk after texturing is accompanied by reduced strength. We have observed that after air-jet texturing, certain structures such as carded ring spun yarns and Siro spun yarns possess a higher level of bulk compared to other structures. Rotor spun yarns have lower bulk after texturing because of their tripartite structure, twist angle variations, and the alternating Z and S helices in their fiber belts. Yarns with reinforced structures like composite spun, wrap spun, and rotor spun are able to withstand higher overfeed and air pressure during texturing.

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