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 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.

Effect of process and nozzle structural parameters on the wrapping quality of core-spun yarns produced on a modified vortex spinning system

2021 ◽  
pp. 004051752198909
Author(s):  
Zeguang Pei ◽  
Xingbao Wang ◽  
Zhimin Li ◽  
Lei Xiao ◽  
Tao Bai ◽  
...  
Keyword(s):  
Vortex Core ◽  
Numerical Study ◽  
Vision System ◽  
Structural Parameters ◽  
Feeding Tube ◽  
Spun Yarn ◽  
Nozzle Pressure ◽  
Spun Yarns ◽  
Nozzle Inlet

Vortex core-spun yarn containing a metal wire has a broad application prospect owing to the combination of its fasciated structure, durability, comfort, and its electrical properties. In this paper, three-dimensional numerical simulations on the flow characteristics inside the nozzle of a modified vortex spinning system for producing core-spun yarns are carried out to investigate the effect of some process and nozzle structural parameters—the nozzle pressure, distance between nozzle inlet and spindle, and protrusion length of the filament feeding tube—on the flow field. Using a machine vision system, experiments are also conducted to investigate the effects of these parameters on the wrapping defects of the vortex core-spun yarns which are then analyzed based on the simulation results. The number of wrapping defects on the yarn greatly decreases as the nozzle pressure increases from 4 × 105 Pa to 5 × 105 Pa. As the distance between nozzle inlet and spindle increases, the number of wrapping defects on the yarn first decreases and then increases. The effect of protrusion length of the filament feeding tube is found to be insignificant. This experimental and numerical study can provide a feasible way for optimizing the quality of the core-spun yarn produced on the modified vortex spinning system and analyzing the mechanism of the effects of parameters.

scholarly journals Wicking Behaviors of Ring and Compact-Siro Ring Spun Yarns with Different Twists

2019 ◽  
Vol 19 (1) ◽  
pp. 68-73 ◽  
Author(s):  
Yuzheng Lu ◽  
Yang Wang ◽  
Weidong Gao
Keyword(s):  
Efficient Method ◽  
Capillary Rise ◽  
Fiber Material ◽  
Staple Fiber ◽  
Yarn Strength ◽  
Capillary Rise Method ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Twist Level ◽  
Yarn Structure

Abstract In this study, the wicking properties of ring and compact-siro ring spun staple yarns were compared. The twist level, which is related to the structure of the staple yarns, was found to significantly influence the wicking property of the two kinds of yarn. Polyester staple fibers with 1.33 dtex × 38 mm were selected as the staple fiber material, and the effect of the twist level on the wicking property was investigated using the capillary rise method. The results show that with a decreasing twist coefficient, the wicking height increases with a decrease in yarn compactness. The compact-siro spun yarn showed better wicking properties owing to it special ply yarn structure. Furthermore, the tension property of the yarns decreased significantly with a decrease in the twist coefficient. Compact-siro spinning was carried out to obtain staple yarns with lower twist coefficients, and the yarns showed great improvement in terms of yarn strength, fiber straightness, and wicking properties. Thus, compact-siro spinning is an efficient method to improve the wicking properties of staple 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 Quality Evaluation of Ethiopian 100% Cotton Carded Ring Spun Yarn with Respect to USTER Standards

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Biruk Fentahun Adamu ◽  
Desalegn Atalie ◽  
Erkihun Zelalem Liyew
Keyword(s):  
Tensile Properties ◽  
Research Work ◽  
Export Market ◽  
Yarn Strength ◽  
Yarn Quality ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Ring Spun Yarn ◽  
Yarn Tenacity ◽  
Fabric Production

Yarn quality influences both fabric production processes efficiency and export market. One method used to gauge competitiveness of an industry is to study its product quality. The aim of this research work is to evaluate the quality of Ethiopian textile spinning mills’ 100% cotton carded ring spun yarns in terms of its evenness (coefficient of mass variation, CVm), imperfections (thick and thin places, neps), and tensile properties with USTER Statistics 2018. Five spinning mills (B3, A0, A2, A4, and K3) of 15N, 20Ne, 25Ne, 30Ne, 35Ne, and 40Ne nominal yarn counts have been selected for the study. The yarn evenness and imperfections were measured using USTER tester 5 and tensile using a STATIMAT tester. The USTER statistical results showed 20.3Ne (mill B3), 32Ne (mill A4), and 36.2Ne (mill A2) had better overall quality, respectively. It was observed that most selected spinning mills had low evenness, imperfections, yarn strength, and good yarn elongation. Tensile properties of A2 (32.85Ne and 36.2Ne) had fallen under 5% USTER statistics percentile which indicates excellent yarn strength. Generally, from studied mills, it was seen that 61.5% of cotton yarn CVm and thin places falls at above 95% and 15% of yarn tenacity falls at ≤5% of Uster statistical percentile.

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.

scholarly journals Determination of Optimum Twist Equation for the Long Staple Combed Cotton Ring-Spun Yarn

Fibers ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 59
Author(s):  
Dunja Šajn Gorjanc ◽  
Neža Sukič
Keyword(s):  
Ring Spinning ◽  
Elongation At Break ◽  
Yarn Strength ◽  
Yarn Twist ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Ring Spun Yarn ◽  
Yarn Hairiness ◽  
Spinning Mill

The aim of this research was to determine the optimum twist equation for ring-spun yarns. The yarn twist can be calculated by different equations. With the research, we tried to find the appropriate equation to determine the yarn twist, which is determined by the values of yarn strength and hairiness. In the research, yarns from long staple combed cotton rovings and of different fineness (10 tex, 11.8 tex, 20 tex and 29.4 tex) were analyzed. The yarn twist was calculated using the equations of Koechlin and Laetsch. The analyzed yarns were produced in the spinning mill on the laboratory ring spinning machine Spinntester. In the second part of the investigation, yarn strength and hairiness were analyzed as a function of yarn twist. The results showed that Laetsch’s equation is suitable for determining the twist for yarns with a fineness of 10 tex, 11.8 tex, 20 tex and 29.4 tex, since, in this case, the calculated number of yarn threads is higher and thus the strength and elongation at break are also higher. The yarn hairiness is higher in analyzed samples for yarns with the twist calculated according to the Koechlin’s equation.

The effect of air-jet nozzle structural parameters on new cotton rotor-jet spun yarn properties

2012 ◽  
Vol 103 (6) ◽  
pp. 595-603 ◽  
Author(s):  
A.R. Hoseinpour ◽  
S. Shaikhzadeh Najar ◽  
M. Bakhshi Jooybari
Keyword(s):  
Structural Parameters ◽  
Air Jet ◽  
Spun Yarn ◽  
Yarn Properties ◽  
Jet Nozzle

scholarly journals Thermophysiological wear comfort of viscose and tencel socks

2020 ◽  
Vol 68 (4) ◽  
pp. 22-29
Author(s):  
Beti Rogina-Car ◽  
Zenun Skenderi ◽  
Zlatko Vrljičak
Keyword(s):  
Thermal Resistance ◽  
Cotton Yarn ◽  
Air Jet ◽  
Wear Comfort ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Ring Spun Yarn ◽  
Single Jersey

Men’s socks were designed and manufactured in multiple plated single jersey structure using 20 tex viscose and Tencel yarn, 156 and 220 dtex multifilament PA 6.6 yarn and 25 tex cotton yarn. Sock mass and sock thickness were determined, the height of the sock leg, the length of the sock foot and half of the leg circumference and half of the foot circumference were measured. Thermophysiological sock wear comfort was determined by measuring thermal resistance on the thermal foot manikin. The results revealed that the sock samples containing the ring spun yarn in the structure had higher thermal resistance than the socks containing rotor and air-jet spun yarns. The obtained difference of thermal resistance of the sock samples per type of the basic yarn was significant. The viscose socks made of ring spun yarns with an added coarser cotton yarn and PA 6.6 yarn had the highest thermal resistance, while the lowest thermal resistance was recorded for the Tencel rotor spun yarns

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.

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