Dref-3 yarn structure with plied staple fibrous core

2018 ◽  
Vol 22 (3) ◽  
pp. 235-246
Author(s):  
Manik Bhowmick ◽  
Arup Kumar Rakshit ◽  
Sajal Kumar Chattopadhyay
Keyword(s):  
Tensile Properties ◽  
Research Work ◽  
Value Added ◽  
Staple Fibre ◽  
Content Type ◽  
The Core ◽  
Spun Yarns ◽  
Yarn Structure ◽  
Single Yarn ◽  
Core Yarn

Purpose Dref-3 friction spun core yarns produced using staple fibre yarn as the core, e.g. Jute core yarn wrapped with cotton fibre, have poorer mechanical properties compared to the core yarn itself. The purpose of this study was to understand the structure of such yarns, that will lead to the optimization of fibre, machine and process variables for production of better quality yarn from the Dref-3/3000 machines. Design/methodology/approach The Dref spinning trials were conducted following a full factorial design with six variables, all with two operative levels. The Dref-3 friction spun yarn, in which the core is a plied, twisted ring yarn composed of cotton singles and the sheath, formed from the same cotton fibres making the singles, has been examined. The structures have also been studied by using the tracer fibre technique. Findings It was observed that rather than depending on the plied core yarn, the tensile properties of the Dref-3 yarn are significantly determined by the parameters those affect the constituent single yarn tensile properties, i.e. the amount of twist and its twist direction, yarn linear density and the sheath fibre proportion used during the Dref spinning in making the final yarn. Further, when the twist direction of single yarn, double yarn and the Dref spinning false twisting are in the same direction, the produced core-sheath yarn exhibits better tensile properties. Practical implications The understanding of the yarn structure will lead to optimized production of all staple fibre core Dref spun yarns. Social implications The research work may lead to utilization of coarse and harsh untapped natural fibres to the production of value-added textile products. Originality/value Though an earlier research has reported the effects of sheath fibre fineness and length on the tensile and bending properties of Dref-3 friction yarn, the present study is the first documented attempt using the tracer fibre technique to understand Dref-3 yarn structure with plied staple fibrous core.

Effects of spinning process and core yarn contents on yarn shape retention

2019 ◽  
Vol 32 (4) ◽  
pp. 457-469
Author(s):  
Wei Yanhong ◽  
Xinjin Liu ◽  
Xuzhong Su ◽  
Zhao Zhimin
Keyword(s):  
Content Type ◽  
Yarn Strength ◽  
The Core ◽  
Yarn Twist ◽  
Twist Factor ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Spinning Process ◽  
Shape Retention ◽  
Core Yarn

Purpose In order to develop high shape retention yarn and investigate the effects of spinning process and core yarn contents on the shape retention of yarn, in this paper, three kinds of yarns, JC/T400 18.5tex (55.6dtex) core-spun yarn, JC/T400 18.5tex (44.4dtex) core-spun yarn and JC18.5tex pure cotton yarn were spun by using the complete condensing Siro-spinning technology. The paper aims to discuss these issues. Design/methodology/approach In this paper, the core-spun yarns were spun by using the complete condensing spinning and Siro-spinning technology. Two key spinning processes, yarn twist factor and core yarn pre-draft ratio, were optimized by using the orthogonal test method first. Then, via the variable control method, the position of the core yarn, the position of the bell mouth and the center distance between two bell mouths were optimized, respectively, and corresponding optimal spinning process of the three yarns was determined. Finally, the yarns were spun under the optimal process, and the performance of the spun yarns was tested and compared. Findings Results show that the yarn twist factor affects yarn strength and hairiness, the position of bell mouth affects the evenness and hairiness of the yarn mainly, and the position of the core yarn affects the coverage and hairiness of the yarn. For the Z-twist spinning, the core yarn enters the front roller from the left side of two strands center, which is beneficial to improve the covering effect of core yarn, and reduce the pilling phenomenon of the yarn. The contents of core yarn affect indicators of the yarn shape retention, such as yarn strength, elastic recovery and abrasion resistance. Originality/value The shape retention of yarns affects the shape retention of fabrics, and the production of yarn with high shape retention is a key step in achieving shape retention of fabrics. At present, there are little studies on the shape retention of yarns, most researchers shave focused on shape retention of fabrics. Using the complete condensing Siro-spinning method to spin the core-spun yarn can improve the quality of the yarn. Compared with traditional ring-spinning yarns, the addition of the core yarn can improve the shape retention of the yarn.

Study on properties of electromagnetic shielding yarns and fabrics

2020 ◽  
Vol 32 (5) ◽  
pp. 677-690
Author(s):  
Xinjin Liu ◽  
Xinxin Yan ◽  
Xuzhong Su ◽  
Juan Song
Keyword(s):  
Stainless Steel ◽  
Continuous Distribution ◽  
Noise Pollution ◽  
Short Fiber ◽  
Electromagnetic Shielding ◽  
Content Type ◽  
The Core ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Shielding Properties

PurposeWith the popularization of electronic products, the electromagnetic radiation pollution has been the fourth largest pollution after water, air and noise pollution. Therefore, electromagnetic shielding property of textiles is attracting more attention. In this paper, the properties of electromagnetic shielding yarns and fabrics were studied.Design/methodology/approachTen kinds of yarn, stainless steel short fiber and polyester blend yarn with three different blending ratios T/S 90/10, T/S 80/20 and T/S 70/30, stainless steel short fiber, polyester and cotton blend yarn with blending ratio C/T/S 35/35/30, core-spun yarn with one 30 um stainless steel filament C/T28tex/S(30 um), core-spun yarn with two 15 um stainless steel filaments (C/T28tex/S(15 um)/S(15 um)), twin-core-spun yarn with one 30 um stainless steel filament and one 50D spandex filament C/T28tex/S(30 um)/SP(50D), sirofil wrapped yarn with one 30 um stainless steel filament feeding from left S(30 um)+C/T28tex, sirofil wrapped yarn with one 30 um stainless steel filament feeding from right C/T28tex+S(30 um), sirofil wrapped yarn with two 15 um stainless steel filaments feeding from two sides S(15 um)+C/T28tex+ S(15 um), were spun. The qualities of spun yarns were measured. Then, for analyzing the electromagnetic shielding properties of fabrics made of different spun yarns, 20 kinds of fabrics were woven.FindingsThe tested results show that comparing to the T/S 80/20 blend yarn, the resistivity of composite yarns with the same ratio of the stainless steel filament is smaller. The possible reason is that comparing to the stainless steel short fiber, the conductivity of stainless steel filament is better because of the continuous distribution of stainless steel in the filament. Comparing with the core-spun yarn, the conductivity of the sirofil wrapped yarn is a little better. Comparing to the fabric woven by the blend yarn, the electromagnetic shielding of the fabric woven by the composite yarn is better, and comparing to the fabric woven by the core-spun yarn, the electromagnetic shielding of the fabric woven by the sirofil yarn is a little better. The possible reason is that the conduction network can be produced by the stainless steel filament wrapped on the staple fiber yarn surface in the fabric, and the electromagnetic wave can be transmitted in the network.Originality/valueIn this paper, the properties of electromagnetic shielding yarns and fabrics were studied. Ten kinds of yarn, including three stainless steel short fiber and polyester blend yarns, one stainless steel short fiber, polyester and cotton blend yarn, two core-spun yarns, one twin-core-spun yarn, three sirofil wrapped yarn, were spun. Then, for analyzing the electromagnetic shielding properties of fabrics made of different spun yarns, 20 kinds of fabrics were woven. The effects of fabric warp and weft densities, fabric structures, yarn kinds, yarn distributions in the fabric on electromagnetic shielding were analyzed.

scholarly journals EFFECT OF SPANDEX DENIER OF WEFT CORE SPUN YARN ON PROPERTIES OF FINISHED STRETCH WOVEN FABRIC

2020 ◽  
Vol 7 (7) ◽  
pp. 21-32
Author(s):  
Sunny Pannu ◽  
Meenakshi Ahirwar ◽  
Rishi Jamdigni ◽  
B. K. Behera
Keyword(s):  
Research Work ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
The Core ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Recovery Percentage ◽  
Shape Retention ◽  
Dual Core ◽  
Made In

The woven fabrics containing cotton/spandex core spun yarns possesses very vital properties of stretch, recovery and thus shape retention from the view point of wearing comfort and garment appearance. Spandex present in the core of core spun yarn is the most essential performer behind these properties. An attempt is made in this research work to study the influence of changing spandex denier in core spun yarn on the stretch and functional properties of stretch woven fabrics. The sole objective of this study is to find out whether different stretch, shrinkage and physical properties of stretch woven fabrics depend upon changing spandex percentage achieved by means of change in spandex filament denier. It was observed that by increasing denier of spandex in core spun weft yarns the increase in weft shrinkage diminishes. Dual core weft with spandex provides good elongation percentage and recovery percentage. The fabric with higher denier spandex in yarn shows a decreasing total hand values trend for summer and winter. The results depicts that the fabrics have higher THV for winter suiting fabrics as compared to summer suiting thus are more suitable for the winter wear.

Structure and performance of the Italian alpine “core”: a counterfactual analysis

2020 ◽  
Vol 12 (4) ◽  
pp. 387-407
Author(s):  
Alberto Bramanti ◽  
Sofia Ricci
Keyword(s):  
Inner Core ◽  
Statistical Significance ◽  
Balance Sheet ◽  
Value Added ◽  
Counterfactual Analysis ◽  
Content Type ◽  
The Core ◽  
The Future ◽  
Future Challenges ◽  
Matching Techniques

Purpose The competitiveness of the Alpine regions is strongly influenced by environmental constraints and its relationship with the urban network in the valley floor, which cannot be one of pure dependence. This study aims to analyse the health of the Italian Alpine economy through the performance of its capital companies, defined as those operating in the strictly mountainous are-as within the territories covered by the Alpine Convention. The authors compare the performance (2012-2018) of the “inner core” firms with a counterfactual sample of companies from neighbouring territories to delineate the strengths and weaknesses of the Alpine enterprises. The paper addresses policymakers and practitioners who will design the future policies for the high lands, exploiting a vast collaborative planning network. Design/methodology/approach The study analyses two broad strands of literature on territorial competitiveness. It uses the coarsened exact matching techniques for the selection of a counterfactual sample at the enterprise level. The study follows a policy-oriented design, offering answers to future challenges. Findings The Alpine region has several different local production systems, with a significant level of heterogeneity among firms that differentiate the top 25% from the rest. The counterfactual analysis carried out does not provide clear evidence of significant differences. Instead, it con-firms strong similarities between the Alpine core and the peri-Alpine belt. It is only in terms of employment growth that the core grows less (with a high statistical significance). Finally, the authors introduce the analysis of sustainable value added (SVA) in the core area and use the “tourism chain” to compare different models. The focus here is on two keywords – rarefied and uncontaminated – that enable the transformation of some typical weaknesses of the “minor (or marginal) mountain” into assets for development, provided that place-based and network policies are activated. Research limitations/implications The study focusses on the Italian Alps and could be extended in the future to the other countries participating in the Alpine Convention. It may also be enriched by qualitative analyses of partnerships and sole proprietorships that are not identified by the balance sheet analysis. Practical implications The study follows a policy-oriented design, offering possible solutions to future challenges. Social implications The study offers some suggestions on the post-COVID-19 phase. The bottom-up, reluctant and community dimension are possible strengths to face the challenges that are opening up. Originality/value The study is one of the very few to carry out a counterfactual analysis of Alpine enterprises. It offers evidence on the strengths and weaknesses of the productive fabric of the high lands and updates the assessment of the health status of Alpine enterprises to accompany future fact-based policies after the COVID pandemic.

Research on performance of twin-core spun yarn and fabric

2019 ◽  
Vol 32 (3) ◽  
pp. 338-355
Author(s):  
Xuzhong Su ◽  
Xuzhong Su ◽  
Xinjin Liu
Keyword(s):  
High Temperature ◽  
Fiber Composite ◽  
Woven Fabrics ◽  
Numerical Control ◽  
Content Type ◽  
The Core ◽  
Spun Yarn ◽  
Finishing Process ◽  
Spun Yarns ◽  
Elastic Filament

Purpose As one kind of filament/staple fiber composite yarn, core spun yarn has been widely used, especially on Jeans. However, there is only one filament in the commonly used core spun yarn, such as spandex, and the performance of the one filament often is influenced during dyeing and finishing. Therefore, in the paper, twin-core spun yarns with two different filaments feeding simultaneously were spun on ring spinning frame modified by one kind of filament feeding numerical control device. The paper aims to discuss these issues. Design/methodology/approach Four kinds of twin-core spun yarns, cotton/spandex/PBT, cotton/spandex/CM800, cotton/spandex/T400, cotton/spandex/SPH with linear density 36.4tex/40D/50D were spun. For improving the covering effect of the two filaments, the filament feeding position, filament pre-drafting multiple, distance between two staple roving, designed twist factor of the core spun yarn were optimized. Findings It is shown that comparing with the core spun yarn, the breaking strength and elongation of the twin-core spun yarns are improved since the addition of another elastic filament, while the evenness is a little worse. Originality/value By using the twin-core spun yarns, corresponding knitted and woven fabrics are produced. Meanwhile, for simulating the dyeing and finishing process, the knitted fabrics were treated during the 150°C high temperature. It is shown that comparing with the fabrics produced by cotton/spandex yarn, addition of another elastic filament can improve the fabric strength and resistant and has positive effect on worsen prevention for high temperature treated fabric elastic recovery, and on change prevention during the dyeing and finishing process for fabric handle properties, and improves the fabric stability.

Structural design and performance characterization of stable helical auxetic yarns based on the hollow-spindle covering system

2019 ◽  
Vol 90 (3-4) ◽  
pp. 271-281
Author(s):  
Junli Chen ◽  
Zhaoqun Du
Keyword(s):  
Tensile Modulus ◽  
The Core ◽  
Yarn Diameter ◽  
Covering System ◽  
Spun Yarns ◽  
Strain Stress ◽  
Core Yarn ◽  
And Performance ◽  
Two Peaks

Helical auxetic yarns (HAYs) spun by ring spinning have a large residual torque, which restricts their application. To address this problem, the hollow-spindle covering system was adopted to prepare structurally stable HAYs consisting of the core yarn and the wrap yarn. Four types of HAYs were manufactured, and a self-designed automatic stretching device was prepared for recording the alteration of yarn diameter. These as-fabricated yarns were measured and characterized in terms of their deformation behavior and auxetic performance. The strain–stress curves of these HAYs have two peaks corresponding to their respective two component yarns during stretch until completely failure, and also it was found that the wrap component is always broken before the core yarn. By comparison, the maximum negative Poisson's ratio (NPR) of −2.55 was achieved with as-prepared HAYs composed of spandex and stainless steel monofilaments. Meanwhile, the structural stability of these yarns was discussed with respect to the residual torque, and the experimental results indicate that the residual torque of these HAYs is obviously smaller than that of conventional ring-spun yarns. These confirm the superiority of our proposed hollow-spindle method. Furthermore, the effects of the diameter of the core yarn and tensile modulus of the wrap yarn on the auxetic behavior were systematically investigated. It is found that a larger NPR can be obtained with a thicker diameter of core yarn and a higher tensile modulus of wrap yarn. It is also demonstrated that an appropriate combination of the component modulus and geometric parameters is essential to fabricate HAY with an obvious auxetic behavior.

Strategy on development of innovative ecosystem in customer values

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xinxin Wang
Keyword(s):  
Customer Value ◽  
Mutual Influence ◽  
Ecological Factors ◽  
Value Added ◽  
Innovation Ecosystem ◽  
Content Type ◽  
Internal Resources ◽  
Continuous Innovation ◽  
The Core ◽  
Fierce Competition

PurposeIn a fierce competition environment in which product prices fall sharply or even tend to be free, only by realizing differentiated customer value through continuous innovation can companies respond quickly and effectively to changes and enhance their core competitiveness.Design/methodology/approachThe innovation ecosystem takes the enterprise as the core, based on stakeholders such as partners, customers and intermediaries, and is highly concentrated in an industry or a region to form close horizontal and vertical links with each other[4]. With the goal of continuously creating differentiated customer value, the internal resources of the collaborative system are integrated, and through the rapid flow of knowledge, material and value between the various entities, the overall value-added ability is continuously improved.FindingsThe innovation ecosystem is the core for users to create expected and dream experience. It combines different knowledge systems of groups and individuals with different characteristics and backgrounds to create an environment where various ideas can effectively collide and recombine and integrate resources through multiple channels to form an organism.Originality/valueEcological factors in the production and application of technology diffusion and knowledge in the process of mutual influence, in the process of dynamic interactive learning and self-reinforcing, identify and understand the customer value, coordinated development of the overall operation of product and service system, to form a consistent brand and improve customer loyalty and ultimately improve the innovation ecosystem value.

Investigation of stretch on air permeability of knitted fabric part I: effect of spinning system

2017 ◽  
Vol 29 (6) ◽  
pp. 754-767 ◽  
Author(s):  
Kumar K.V. ◽  
Sampath V.R. ◽  
Prakash C.
Keyword(s):  
Design Methodology ◽  
Research Work ◽  
Air Permeability ◽  
Knitted Fabrics ◽  
Content Type ◽  
The Core ◽  
Ring Yarn ◽  
Spun Yarn ◽  
Ring Spun Yarn ◽  
Made In

Purpose Air permeability of knitted fabrics is normally measured for the samples in their unstretched state. But, this air permeability values indicate the ability of these garments to allow air through them when they are not in use. But, the real-time condition is different and certainly the knitted garments mentioned above will subject to a degree of stretch during their usage. So, the measurement of air permeability under stretch and the fabric properties which would influence the air permeability of weft-knitted fabrics in their stretched state is of paramount importance. The paper aims to discuss these issues. Design/methodology/approach The aim of this research work is to investigate the change in air permeability values under the incremental extension of cotton tubular weft-knitted fabrics produced from the yarns of different spinning systems. Findings From the results, it is evident that the pique fabric samples of compact spun yarn displayed the highest air permeability values during the incremental stretch at all the three relaxation states. It is followed by the pique samples of ring spun yarn. Next to pique samples, the jersey samples made from the compact yarn and ring spun yarn revealed more air permeability, respectively. The core spun pique samples and core spun jersey samples displayed the least air permeability values, respectively. But, the pique and jersey samples made up of ring yarn and compact yarn showed gradual reduction in their air permeability towards the incremental stretch and the core spun pique samples and core spun jersey samples were uniformly seen with gradual increase in their air permeability during the incremental stretch. Originality/value Very limited quantity of research has been carried out in this area. So, a novel attempt has been made in this research work to investigate the influence of incremental stretch on air permeability of single knit structures.

scholarly journals Impact of Weft Yarn Density and Core-yarn Fibre Composition on Tensile Properties, Abrasion Resistance and Air Permeability of Denim Fabrics

2021 ◽  
Author(s):  
Nele MANDRE ◽  
Tiia PLAMUS ◽  
Andres KRUMME
Keyword(s):  
Tensile Properties ◽  
Abrasion Resistance ◽  
Polyester Fibre ◽  
Air Permeability ◽  
Fibre Content ◽  
Woven Fabric ◽  
Weft Yarn ◽  
The Core ◽  
Core Yarn ◽  
The Impact

Characteristics and serviceability of denim fabrics have undergone major changes. Nowadays denim is commonly used for casual wear. Durability and comfort are important parameters for consumers when choosing a denim garment. Therefore, in this study, abrasion resistance, tear and tensile properties of core–spun yarns and air permeability of denim fabrics with different weft yarns per centimetre and fibre content were analysed. The test results showed that weft yarns per centimetre influences fabric air permeability negatively but abrasion resistance increases. Higher weft yarns per centimetre influences fabric air permeability negatively but abrasion resistance increases. Polyester, elastane, modal, viscose and Lycra T400 were used in the core of weft yarn to analyse the impact of those fibres on the durability and comfort properties. Elastane is used to add stretchability to the fabric, which provides comfort to the wearer. The higher the elastomeric fibre content in the fabric, the greater is its elasticity; however, the tensile properties of the woven fabric decrease. The tear strength of the fabric was increased by the presence of the polyester fibre in the core.

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.

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