Theoretical research of spinning triangle division on spun yarn torque

2019 ◽  
Vol 31 (6) ◽  
pp. 839-855
Author(s):  
Xuzhong Su ◽  
Xinjin Liu
Keyword(s):  
Design Methodology ◽  
Close Packing ◽  
Theoretical Research ◽  
Hexagonal Close Packing ◽  
Ring Spinning ◽  
Content Type ◽  
Fiber Tension ◽  
Spun Yarn ◽  
Cotton Yarns ◽  
Spinning Triangle

Purpose The purpose of this paper is to theoretically study the effects of ring spinning triangle division on spun yarn torques. Design/methodology/approach The case that the spinning triangle is divided into two parts, primary triangles and final triangle, is investigated. Theoretical model of yarn torque was given by linking the fiber tension in the spinning triangle to yarn torque under the assumption that the arrangement of fibers (substrands) in the substrands (yarn) is hexagonal close packing. Then, as an application of the proposed method, 14.6tex cotton yarns were taken as an example for the numerical simulations. Findings The fiber tensions in the divided spinning triangles and corresponding yarn torques were simulated numerically by using MATLAB software. The effects of division proportions and number of primary triangles on spun yarn torques are analyzed theoretically. Originality/value It is shown that suitable spinning triangle division is benefit for reducing yarn torque.

Theoretical study of Solospun yarn torque

2015 ◽  
Vol 27 (5) ◽  
pp. 628-639 ◽  
Author(s):  
Xinjin Liu ◽  
Xuzhong Su
Keyword(s):  
Theoretical Model ◽  
Theoretical Study ◽  
Ring Spinning ◽  
Content Type ◽  
Fiber Tension ◽  
Spun Yarns ◽  
Cotton Yarns ◽  
Small Primary ◽  
Spinning Triangle ◽  
Simulation Results

Purpose – Solospun technology is one of the most important new spinning methods, which is implemented by dividing Ring spinning triangle into several small primary triangles and one final triangle by a Solospun roller. That is, there are two parts of spinning triangle in the Solospun technology, including primary triangles part and final triangle part. In the general case, the primary triangles are much smaller than final triangle. Therefore, the purpose of this paper is to present theoretical study of Solospun yarn torqueby linking the fiber tension in the spinning triangle to yarn torque under the assumption that the primary triangles and the primary twist are ignored. Design/methodology/approach – The theoretical model of the residual torque within Solospun yarn due to the fiber tension was given. Then, as an application of the proposed method, 14.6 tex cotton yarns were taken as an example for the numerical simulations. The fiber tension in the Solospun spinning triangles and corresponding yarn torque were simulated numerically by using Matlab software. The relationships between yarn torque and spinning triangle parameters are analyzed according to the simulation results. Furthermore, the properties of spun yarns produced by the Solospun and Ring spinning system are evaluated and analyzed by using the simulation results. Findings – It is shown that comparing with the Ring spun yarn, Solospun yarn torque is a little larger. Meanwhile, with an increase of substrand number, the fluctuation of curve of average fiber tension in Solospun system is increased firstly, and then decreased, i.e. showing parabola shape, potentially leading to corresponding change of yarn torque. Originality/value – In this paper, theoretical study of Solospun yarn torque is presented by linking the fiber tension in the spinning triangle to yarn torque under the assumption that the primary triangles and the primary twist are ignored. The theoretical model of the residual torque within Solospun yarn due to the fiber tension was given.

Research on the mechanism of the modified ring-spinning system using a dynamic twist-resistant device and its yarn quality

2018 ◽  
Vol 89 (15) ◽  
pp. 3169-3177 ◽  
Author(s):  
Ruiqi Shao ◽  
Longdi Cheng ◽  
Yanping Yu ◽  
Jianxin Xu ◽  
Jianming Wu
Keyword(s):  
High Speed ◽  
Twist Angle ◽  
Particle Flow Code ◽  
Ring Spinning ◽  
Fiber Tension ◽  
Significant Difference ◽  
Cotton Yarns ◽  
Spinning Process ◽  
Spinning Triangle ◽  
The Comparative Study

The spinning triangle is a critical area in the ring-spinning process; the geometry of the spinning triangle influences the distribution of the fiber tension, and affects the qualities of the spun yarn. In this paper, a kind of dynamic twist-resistant device that can affect the geometry of the spinning triangle is employed for improving the conventional ring-spinning system.  The yarn twists between the front roller nip and dynamic twist-resistant device were captured in the spinning process using a high-speed camera. Comparing yarn twists of the two types of yarn, the modified yarns have a lower twist angle, indicating that the device can produce resistant torque. Particle Flow Code software was used to simulate the acts of the device on the yarn, and the results verified the existence of resistant torque. The resistant torque on the yarn affects the geometry of the spinning triangle and the distribution of fiber tension. In addition, 19.4 and 14.5 tex cotton yarns with three different twists, 700, 800 and 900 tpm, were produced by the modified and conventional ring spinning. The comparative study revealed that the modified yarns have a better performance in terms of yarn strength and hairiness, and show no significant difference in terms of the yarn evenness when compared with the conventional yarns at the same twist level. The mechanism of the effect of the dynamic twist-resistant device on yarn qualities is discussed by analyzing the distribution of fiber tension.

Reducing Yarn Hairiness in a Modified Ring Spinning Yarn Path by Various Offsets

2011 ◽  
Vol 331 ◽  
pp. 493-497
Author(s):  
Xu Zhong Su ◽  
Wei Dong Gao ◽  
Ting Ting Wu ◽  
Xin Jin Liu ◽  
Yun Zhang
Keyword(s):  
Critical Region ◽  
Breaking Force ◽  
Ring Spinning ◽  
Fiber Tension ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Spinning Process ◽  
Spinning Triangle ◽  
Yarn Hairiness ◽  
The Right

Spinning triangle is a critical region in the spinning process of yarn. Its geometry influences the distribution of fiber tension in the spinning triangle and the properties of spun yarns, such as the yarn breakage and hairiness. In this paper, the relationships between the spinning angle and yarn properties especially the yarn hairiness were investigated under various horizontal offsets. The properties of spun yarns produced by the modified system were evaluated and analyzed. Both left diagonal and right diagonal yarn arrangements were examined. The results indicate that the right diagonal yarn path leads to reduce yarn hairiness but the left diagonal yarn path leads to increase yarn hairiness; the breaking force of yarn changes little; yarn evenness deteriorates slightly with the changes of offset.

Numerical simulation of top roller pressure and deformation in ring spinning with three draft zones using finite element method

2016 ◽  
Vol 28 (2) ◽  
Author(s):  
Xiaojuan Zhang ◽  
Juan Wu ◽  
Bojun Xu ◽  
Xinjin Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Carbon Fiber ◽  
Design Methodology ◽  
Ring Spinning ◽  
Ansys Software ◽  
Yarn Quality ◽  
Cotton Yarns ◽  
Yarn Tenacity ◽  
Element Method

Purpose This paper presented a new kind of ring spinning frame with four pairs of rollers, and they are the front roller and the front top roller, the first middle roller (FMR) and the first middle top roller (FMTR), the second middle roller and the second middle top roller, the back roller and the back top roller. The FMR is the front roller of middle draft zone, and the back roller of the front draft zone. Therefore, the deformation of FMTR during spinning is an important factor for yarn quality, which was studied in this paper. Design/methodology/approach In this paper, by finite element method (FEM), the pressure and deformation of FMTR were studied. FMTR made from steel and sleeved carbon fiber were compared. 5.8tex, 4.9tex and 3.9tex cotton yarns were spun, and corresponding numerical simulations of FMTR pressure and deformation were presented in ANSYS software and comparatively analyzed. Then, corresponding yarn qualities were compared. Findings The results indicate that pressure and deformation of FMTR have little effects on yarn tenacity and hairiness, while have great effects on yarn evenness. For 5.8tex and 4.9tex cotton yarn, yarns spun by FMTR made from sleeved carbon fiber have larger pressure and deformation at the middle of nipper bites of FMR and FMTR, and yarn evenness is better. For 3.9tex cotton yarns, at the middle of nipper bites of FMR and FMTR, FMTR made from steel has smaller pressure. But deformation of FMTR made from steel is larger, and yarn evenness is better. Originality/value This paper studied pressure and deformation of FMTR by finite element method (FEM), which serve as a theoretical underpinning for yarn spinning in three draft zones ring spinning machine.

Study on properties of decolorizing yakwool fiber and spun yarn

2019 ◽  
Vol 31 (1) ◽  
pp. 90-102
Author(s):  
Qin Xiaoxuan ◽  
Hui’e Liang ◽  
Xuzhong Su ◽  
Xinjin Liu
Keyword(s):  
Mechanical Properties ◽  
Design Methodology ◽  
Natural Fiber ◽  
Physical And Mechanical Properties ◽  
Optimal Process ◽  
Textile Processing ◽  
Content Type ◽  
Oxidation Reduction ◽  
Spun Yarn

Purpose As a natural fiber, yakwool has attracted much attention in textile processing due to its excellent properties and wearabilities. However, the main colors of yakwool are black and brown. Therefore, for extending the application scopes of the fiber, the decolorization of the yakwool fiber is usually needed, especially for the black fiber. The paper aims to discuss this issue. Design/methodology/approach In the paper, the properties of the yakwool fiber were tested first, especially the melanin granules in the fiber. Then, the decolorization of the yakwool fiber was studied using the oxidation–reduction decolorization method, and corresponding optimal process of the decolorization was given. Then, the properties of the decolorized yakwool fiber were tested and compared with those of the original fiber. Findings It is shown that, after decolorization, the physical and mechanical properties of the fiber were deteriorated, especially in terms of the strength and elongation. Therefore, the fiber became shorter and thinner, and the scales were damaged. When compared with the yarn spun from the original yakwool fiber, it was observed that the properties of the yarn spun from the decolorized yakwool fiber deteriorated because of the deterioration in the properties of the original fiber. Originality/value In the paper, for extending the application scopes of the yakwool fiber, the decolorization of the yakwool fiber was studied.

scholarly journals Theoretical Study of Effect of Ring Spinning Triangle Division on Fiber Tension Distribution

2015 ◽  
Vol 10 (3) ◽  
pp. 155892501501000
Author(s):  
Xinjin Liu ◽  
Xuzhong Su
Keyword(s):  
Theoretical Study ◽  
Theoretical Models ◽  
Ring Spinning ◽  
Minimum Potential Energy ◽  
Tension Distribution ◽  
Fiber Tension ◽  
Spun Yarns ◽  
Spinning Process ◽  
Spinning Triangle ◽  
Minimum Potential

The spinning triangle is a critical region in the spinning process of staple yarn. Its geometry influences the distribution of fiber tension at spinning triangle directly and affects the qualities of spun yarns. Taking appropriate measures to change the ring spinning triangle geometry and improve the qualities of yarn has attracted more and more interest recently. Spinning triangle division is one of the most effective measures, such as solospun technology. Therefore, in this paper, the effect of ring spinning triangle division on fiber tension distribution was studied theoretically. The general case that the spinning triangle is divided into two parts, primary triangle and final triangle, was investigated. Firstly, theoretical models of the fiber tension distributions in the final and primary spinning triangles are given respectively using the principle of minimum potential energy. Secondly, the fiber tension distributions in the spinning triangle with different shape parameters are numerically simulated. Finally, the possible effects of ring spinning triangle division on yarn qualities are analyzed according to the numerical simulations and previous results. In addition, the properties of spun yarns produced by the modified ring spinning system were evaluated and analyzed.

Optimization of Break Draft, Pin Spacer and Rubber Cots Hardness to Enhance the Quality of Ring Spun Yarn Using Factorial Design

2018 ◽  
Vol 13 (2) ◽  
pp. 155892501801300 ◽  
Author(s):  
Furqan Khurshid ◽  
Sarmad Aslam ◽  
Usman Ali ◽  
Amir Abbas ◽  
Talha Ali Hamdani ◽  
...  
Keyword(s):  
Quality Parameters ◽  
Ring Spinning ◽  
Technological Parameters ◽  
Fiber Assembly ◽  
Yarn Quality ◽  
Spun Yarn ◽  
Ring Spun Yarn ◽  
Spinning Triangle ◽  
The Individual

The aim of the present work is to optimize the drafting parameters for ring spinning by using full factorial (23) experimental design. Three drafting parameters of ring spinning each at two levels were chosen for this study. These technological parameters were break draft, size of pin spacer and hardness of rubber cots. It was found from statistical analysis that pin spacer size has a significant effect on yarn unevenness (U %), imperfection index (IPI), hairiness (H) and yarn strength (CLSP) compared to the other two chosen factors. These yarn quality parameters were improved by increasing the spacer size. The increase in spacer size reduces the cohesive forces among the fibers during drafting. The pin between the cradle and the top front roller transfer the individual fibers from the drafted fiber assembly to the spinning triangle without any stretching or accumulation. This yields a more integrated structure and the quality of yarn is improved.

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 Mechanical and FR Properties of Different Ratios of Cotton/Polysulfonamide (PSA) Core Spun and Blended Yarns

2014 ◽  
Vol 9 (4) ◽  
pp. 155892501400900
Author(s):  
Lloyd N. Ndlovu ◽  
Cunchao Han ◽  
Chongwen Yu
Keyword(s):  
Synthetic Fiber ◽  
Fire Retardancy ◽  
Ring Spinning ◽  
Research Focus ◽  
Chemically Modified ◽  
The Core ◽  
Blended Yarn ◽  
Spun Yarn ◽  
Cotton Yarns ◽  
Research Institute

The textile and its allied industries have had its research focus on ways of alleviating the risks and losses posed by uncontrolled fires. Textiles have been chemically modified to impart flame/fire retardancy (FR) properties and also studies have been done on inherently FR fibers. This research focuses on Polysulfonamide (PSA) fiber, an inherently FR fiber developed by Shanghai Textile Research Institute and Shanghai Synthetic Fiber Research Institute. The purpose of this research is to study ways of incorporating PSA into yarns that will utilize the benefits of the PSA fiber while compensating for its limitations. The 100% PSA yarn and five different percentage variations of PSA/cotton blended yarns were produced by ring spinning. The blending methods were intimate blending and core spinning, with cotton yarns being used as core and PSA fibers as sheath. The tensile, evenness, hairiness and FR properties of these yarns together with the blending methods were studied and compared. The results showed that the blended yarn yielded better tensile and hairiness properties whereas the core spun yarn had better evenness and flame retardancy properties.

Sukukrisks – a structured review of theoretical research

2019 ◽  
Vol 10 (1) ◽  
pp. 35-49 ◽  
Author(s):  
Rashedul Hasan ◽  
Abu Umar Faruq Ahmad ◽  
Tamiza Parveen
Keyword(s):  
Capital Markets ◽  
Design Methodology ◽  
Early Stage ◽  
Theoretical Research ◽  
Content Type ◽  
Specific Category ◽  
Potential Problems ◽  
Compliance Requirements ◽  
Practical Implications

PurposeThe key purpose of this study is to make awareness for faithful Muslims who are interested to invest in Islamic capital markets so as to enable them making right decision while considering investment inSukukover conventional interest-bearing bonds.Design/methodology/approachThis study reviews past literature to analyse contemporarySukukrisks and discusses several mechanisms to mitigate those risks.FindingsThe study shows thatSukukcan be good alternatives to conventional bonds.Sukukstructures need to be further developed to fulfil theSharīʿahcompliance requirements.Research limitations/implicationsThis study is exploratory in nature, and as such, it seeks to identify the risks related toSukukissuance. Given this limitation, it did not provide empirical evidences relating to any specific category ofSukukrisks.Practical implicationsAn in-depth knowledge ofSukukrisks would help both academicians and investors understand the potential problems related toSukukstructures and take precautions in the early stage to prevent causes of being defaulted or bankrupt.Originality/valueThe risks related toSukukhave been explored in all potential roots. This study has offered some significant techniques to prevent the relevant risks for investors’ benefits. Information being provided throughout this study is expected to serve potential investors inSukukas a guide to make right decisions and enable them to minimise the risk to secure healthy returns on their investments.

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