The impact of combing and processing parameters on the structure and properties of fine count vortex yarns

2012 ◽  
Vol 83 (4) ◽  
pp. 396-405 ◽  
Author(s):  
N Erdumlu ◽  
W Oxenham ◽  
B Ozipek
Keyword(s):  
Processing Parameters ◽  
Short Fiber ◽  
Fiber Content ◽  
Structure And Properties ◽  
Factors Affecting ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Yarn Count ◽  
Yarn Structure ◽  
The Impact

In this paper, the impact of short fiber content, yarn count and yarn delivery speed on the structure and properties of fine count cotton vortex yarns were investigated. The factors affecting the fine count yarn spinning on a vortex spinning system were determined on the basis of yarn structure and properties by using the linear regression technique. Moreover, the spinning limits of combed cotton vortex spun yarns were investigated. The results of the experiments revealed that the short fiber content in the cotton sliver is an important parameter in spinning fine count vortex spun yarns. The lower short fiber content in the sliver allows finer counts to be spun in the vortex spinning system. It was also observed that yarn delivery speed influences the yarn structure, and hence the yarn properties significantly, since it determines the residence time of the fibers in the yarn formation zone, and also affects the fiber control due to the air flow caused by the surface speed of the delivery rollers. In addition, the structure and properties of vortex spun yarns change significantly with regard to yarn count.

scholarly journals Open-End Yarn Properties Prediction Using HVI Fibre Properties and Process Parameters

2017 ◽  
Vol 17 (1) ◽  
pp. 6-11 ◽  
Author(s):  
Hanen Ghanmi ◽  
Adel Ghith ◽  
Tarek Benameur
Keyword(s):  
Response Surface ◽  
Process Parameters ◽  
Processing Parameters ◽  
Raw Material ◽  
Spun Yarn ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Yarn Count ◽  
Input Variables ◽  
Rotor Spun Yarn

AbstractThis article provides three models to predict rotor spun yarn characteristics which are breaking strength, breaking elongation and unevenness. These models used noncorrelated raw material characteristics and some processing parameters. For this purpose, five different cotton blends were processed into rotor spun yarns having different metric numbers (Nm10, Nm15, Nm18, Nm22, Nm30 and Nm37). Each count was spun at different twist levels. Response surface method was used to estimate yarn quality characteristics and to study variable effects on these characteristics. In this study, predicting models are given by the analysis of response surface after many iterations in which nonsignificant terms are excluded for more accuracy and precision. It was shown that yarn count, twist and sliver properties had considerable effects on the open-end rotor spun yarn properties. This study can help industrial application since it allows a quality management-prediction based on input variables such as fibre characteristics and process parameters.

Investigation into the effects of yarn structure and yarn count on different types of core-spun yarns

2021 ◽  
pp. 004051752110214
Author(s):  
Samah M E Elrys ◽  
Fawkia Faheem El- Habiby ◽  
Rehab Abd Elkhalek ◽  
Ahmed S Eldeeb ◽  
Abdellatif M El-Hossiny
Keyword(s):  
Pairwise Comparison ◽  
Factorial Analysis ◽  
Sem Images ◽  
Elastic Core ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Yarn Count ◽  
Yarn Structure ◽  
Yarn Hairiness ◽  
Dual Core

The scope of this research is to study the effect of yarn structure and yarn count on properties of types of core-spun yarns, including elastic core/T400, elastic core/Lycra, dual core, and tri-core yarns. Five types of yarn structures and three yarn counts were produced. Mechanical properties, yarn irregularity, imperfections, and hairiness were measured. Full-factorial analysis and Tukey tests were performed on the test results. It was concluded from factorial analysis that yarn count, yarn structure, and two-way interaction had a significant effect on yarn properties, except for yarn hairiness where the effect of yarn structure and two-way interaction was not significant. A Tukey pairwise comparison was used in this study to specify exactly the subgroups of yarn count and yarn structure that have a significant mean difference. The scanning electron microscopy (SEM) images of the dual-core yarns and tri-core yarns were performed to illustrate the structure of these yarns.

Structure and Properties of Double-Filament Tri-Component Combined Yarn

2014 ◽  
Vol 1035 ◽  
pp. 101-105
Author(s):  
Yi Qiang Gao
Keyword(s):  
Abrasion Resistance ◽  
Manufacturing Process ◽  
Breaking Strength ◽  
Structure And Properties ◽  
Breaking Elongation ◽  
Yarn Properties ◽  
Yarn Structure ◽  
Yarn Hairiness

Manufacturing process of combined yarn with different filament size and cotton roving has been discussed. It shows that filament feeding point has some effect on combined yarn structure and yarn properties. If the filaments are fed from different sides of the cotton strand, they usually wrap the strand in parallel. If the filaments are fed from the same side of the strand, they wrap the strand crossed more often. Filament feeding point has an effect on yarn hairiness while it affects yarn breaking strength, yarn breaking elongation and abrasion resistance slightly. Yarn property weight is determined by subjective empowerment and Borda method is used to analyze yarn property. It has proved that if the filaments are fed from different sides of the cotton strand, the filament-roving space is set at 4mm respectively; the combined yarn shows the best.

The structure and properties of carded cotton vortex yarns

2012 ◽  
Vol 82 (7) ◽  
pp. 708-718 ◽  
Author(s):  
Nazan Erdumlu ◽  
Bulent Ozipek ◽  
William Oxenham
Keyword(s):  
Structural Analysis ◽  
Physical Properties ◽  
Average Length ◽  
The Other ◽  
Critical Parameters ◽  
Structure And Properties ◽  
Progressive Change ◽  
Spun Yarns ◽  
Yarn Count ◽  
Structural Classes

The properties and spinning limits of carded cotton vortex spun yarns were investigated through the progressive change in yarn count. The yarns were tested for structural and physical properties. Critical parameters were obtained, including the ratio of wrapper fibers to core fibers, proportion and average length of different structural classes in the yarn. The structural analysis revealed that the wrapper fibers constitute an increasing proportion of the fibers as the yarn becomes finer. Moreover, the proportion and average length of different structural classes in vortex spun yarns change with yarn count. The analysis of the data obtained from yarn testing showed that as the yarn becomes finer, the yarn becomes more uneven and the number of yarn imperfections markedly increase. On the other hand, the tensile properties of vortex spun yarns remain almost unchanged as the yarn gets finer.

scholarly journals Improvement of Carded Yarn Quality by Changing Ring Frame Break Draft for Different Short Fibre Index

2017 ◽  
Vol 13 (36) ◽  
pp. 346
Author(s):  
Md. Riazul Hoque ◽  
Md. Rokonuzzaman ◽  
Joykrisna Saha ◽  
Mohammed Farhad Mahmud Chowdhury
Keyword(s):  
Short Fiber ◽  
Short Fibers ◽  
Ring Yarn ◽  
Yarn Quality ◽  
Ring Frame ◽  
Three Samples ◽  
Yarn Count ◽  
Spinning Process ◽  
Yarn Hairiness ◽  
The Impact

Three types of cotton fibers lot having short fiber index (SFI) 8.65, 9.45 and 11.00 were taken to perform the experiment. The break drafts (BD) in ring frame were set to 1.136, 1.174 and 1.211 to produce the sample yarn; 30S /1 carded knit yarn (30KK) and 34S /1 carded knit yarn (34KK). The objective of this study was to find out the impact of short fibers by changing ring frame break draft on yarn quality and spinning process performance. The yarn quality such as CVm%, thin places (-50%)/km (TN), thick places (+50%)/km (TK), neps (+200%)/km (NP), count-strength product (CSP) and yarn hairiness (H) found satisfactory level for both yarn count in case of ring frame break draft 1.174 for low and high short fiber index. In this study, both physical and tensile properties of ring yarn were found better for ring frame break draft 1.174 of the three samples and quality deteriorates as SFI increases from 8.65 to 11.00.

scholarly journals Formation of Carded Webs from Microfibers

2001 ◽  
Vol os-10 (1) ◽  
pp. 1558925001os-10
Author(s):  
Yoon J. Hwang ◽  
William Oxenham ◽  
Abdelfattah M. Seyam
Keyword(s):  
Experimental Investigation ◽  
Strong Correlation ◽  
Processing Parameters ◽  
Short Fiber ◽  
Fiber Content ◽  
Statistical Analyses ◽  
Fiber Breakage ◽  
Machine Direction ◽  
Web Quality ◽  
The Web

The paper is reporting an extensive experimental investigation to optimize the processing of microfibers on a flat top card. Carding parameters, type of fiber finish and their interactions were studied in terms of their impact on web quality. The web quality was determined by assessing the nep content and fiber breakage due to carding. Statistical analyses of the data indicate that fiber finish and processing parameters can be selected to minimize neps and fiber breakage during carding. Furthermore the investigation showed that there is a strong correlation between the incidents of neps and the increase in short fiber content during carding. An additional finding of this study is that the generation of neps was not uniform across the width of the carded web and is influenced by fiber load measured on the doffer in the cross machine direction.

Study on the Dyed Cotton Fibers Damage in Spinning Processes and its Effect on the Cotton Mélange Yarn Properties

2008 ◽  
Vol 12 (1) ◽  
pp. 71-78 ◽  
Author(s):  
A.R. Moghassem
Keyword(s):  
Fiber Length ◽  
Mechanical Characteristics ◽  
Short Fiber ◽  
Fiber Content ◽  
Cotton Fibers ◽  
Mass Variation ◽  
Elongation At Break ◽  
Fiber Damage ◽  
Yarn Properties

Grey cotton fibers with a mean fiber length and fineness of 29 mm and 4.2 micronair was pretreated, scoured and dyed. Three ring yarns were spun separately from 100% grey cotton (R.R.Y.), 50% dyed and 50% grey cotton blend (M.R.Y.) and 100% dyed cotton (D.R.Y.). The extent of fiber damage was assessed by measuring the length and the mechanical characteristics of cotton fibers after passing the fibers through the lap machine and the draw frame II. Properties of R.R.Y., M.R.Y. and D.R.Y. samples were examined. In terms of tenacity and elongation at break, grey and dyed cotton fibers, which were selected after being processed by the lap machine and the draw frame II, were very similar. The fiber length by number and weight of grey cotton was longer than that of dyed cotton, while the amount of fiber nep and short fiber content of dyed cotton were more than those of grey cotton. The three yarn samples were the same in terms of elongation at break. The tenacity of R.R.Y. was the highest but the yarn sample was the lowest in terms of coefficients of mass variation (Cv%), imperfection and hairiness in comparison with the M.R.Y. and D.R.Y. samples.

scholarly journals Measurement of torsional rigidity of yarns with different crimps

2016 ◽  
Vol 88 (6) ◽  
pp. 605-613
Author(s):  
Julie Peiffer ◽  
KyoungOk Kim ◽  
Hiroaki Yoshida ◽  
Masayuki Takatera
Keyword(s):  
Linear Relationship ◽  
Torsional Rigidity ◽  
Measurement Device ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Yarn Count

The effect of crimp on torsional rigidity of monofilament and cotton spun yarns was studied. Two kinds of polymeric monofilament yarns and four kinds of cotton spun yarns were examined. Different crimps were applied to the yarn using original crimp setting equipment. To fix the crimp, the polymeric monofilaments were treated with heat, and the cotton spun yarns were treated with steam. The test samples were then produced following two protocols: with or without the application of weight. The yarn torsional rigidities with crimp were measured using a torsional measurement device, and were compared with those without crimp. Almost no weight was applied to the cotton spun yarns to preserve the crimp during testing. The results with and without the application of weight were compared. For the monofilament yarns, the torsional rigidities of the crimped yarns had a linear relationship with the crimp ratio. For the cotton spun yarns, the torsional rigidities of the crimped yarns were smaller than those of the straight yarns. The smaller the yarn count, the smaller the yarn torsional rigidity. The effect of crimp on torsional rigidity differed according to the yarn counts. There was almost no difference in crimped yarn torsional rigidity between the straightened and non-straightened yarns after crimp setting. Therefore, there is a possibility that the change in yarn properties could have resulted from the bending of the fiber during crimp setting, and not from the shape of the crimp afterwards.

Analysis of the influence of the guided needle structure on the vortex spinning process and yarn properties

2018 ◽  
Vol 89 (7) ◽  
pp. 1246-1257 ◽  
Author(s):  
Chenchen Han ◽  
Longdi Cheng ◽  
Weidong Gao ◽  
Yuan Xue ◽  
Wenliang Xue ◽  
...  
Keyword(s):  
High Speed ◽  
Structure And Properties ◽  
Dynamics Model ◽  
Airflow Velocity ◽  
Binding Force ◽  
Yarn Properties ◽  
Production Practice ◽  
Spinning Process ◽  
Needle Structure ◽  
Yarn Structure

Based on the nozzle structures of MVS870 and J26, this paper analyzed the influence of the guided needle existence and length on the vortex spinning process and yarn properties. In this research, we compared the airflow pressure and velocity distribution under different guided needle structures in the twisting cavity, combining with the numerical simulation of the fluid dynamics model. The influence of the negative pressure and the airflow velocity changing law on the yarn structure and properties was verified by experiments in this paper. The results show that the existence of the guided needle structure could help the head end of the single fiber get into the center of the yarn with less pulling-out by the high-speed rotating airflow, and then improve the yarn tightness and the yarn binding force on the fibers, which will result in a greater extent, as the length of the guided needle is larger. This study present a feasible theoretical analysis for the influence of the guided needle structure on the vortex spinning process and yarn properties, which has guiding significance in actual production practice.

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