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Long Di Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Some Variables on the Fibre Packing Pattern in a Yarn Cross-section for Vortex Spun Yarn
    2016
    Co-Authors: Zhuan Yong Zou, Long Di Cheng, Shaoming Zheng, Jiangwei Yao, Jinjiang Laboratory, P. R. China
    Abstract:

    This paper examined the influence of various parameters such as fibre fineness, yarn count, distance from the Front Roller nip point to the hollow spindle, nozzle pressure and yarn delivery speed on the fibre packing pattern in a yarn cross-section for vortex spun yarn. Cross-section images of vortex spun yarns were used to evaluate the fibre packing pattern. Results from different variables influencing the fibre packing pattern for vortex spun yarn were also analysed. The results indicated that the fibre fineness, yarn count, distance from the Front Roller nip point to the hollow spindle, nozzle pressure and yarn delivery speed are all significant parameters for yarn hairiness and fibre packing density in a vortex spun yarn cross-section. Key words: vortex spun yarn, process parameter, fibre packing density, yarn structure. of vortex spun yarn. Zheng et al. [13] in-vestigated the fibre packing density and effective fibre packing density of vortex and ring spun yarns, and also calculate

  • Investigation of fiber trajectory affected by some parameter variables in vortex spun yarn
    Textile Research Journal, 2014
    Co-Authors: Long Di Cheng, Bojun Xi
    Abstract:

    The principle and process of yarn formation determines fiber trajectory in a yarn. The objective of this paper was to investigate the effect of some parameter variables on the fiber trajectory of vortex spun yarn produced by the MVS No. 861 spinner, based on tracer fiber and image mosaics techniques. Some typical fiber configurations in vortex spun yarn were also observed. It was found that fiber trajectories in vortex spun yarn are affected significantly by the following parameters: fiber specification, distance between the Front Roller nip point and the tip of the hollow spindle, nozzle pressure, and yarn delivery speed, as well as yarn linear density. Some typical fiber configurations of vortex spun yarn include straight, ideal trajectory, hooked (trailing, leading, and both ends), looped, and entangled. Increasing the fiber length or decreasing the distance between the Front Roller nip point and the tip of the hollow spindle will result in an increase of the core fiber length in vortex spun yarn. The ...

  • Effect of Some Variables on the Fibre Packing Pattern in a Yarn Cross-section for Vortex Spun Yarn
    Fibres & Textiles in Eastern Europe, 2014
    Co-Authors: Shaoming Zheng, Long Di Cheng, Bojun Xi
    Abstract:

    This paper examined the influence of various parameters such as fibre fineness, yarn count, distance from the Front Roller nip point to the hollow spindle, nozzle pressure and yarn delivery speed on the fibre packing pattern in a yarn cross-section for vortex spun yarn. Cross-section images of vortex spun yarns were used to evaluate the fibre packing pattern. Results from different variables influencing the fibre packing pattern for vortex spun yarn were also analysed. The results indicated that the fibre fineness, yarn count, distance from the Front Roller nip point to the hollow spindle, nozzle pressure and yarn delivery speed are all significant parameters for yarn hairiness and fibre packing density in a vortex spun yarn cross-section.

  • Analysis of the Fiber Spatial Trajectory in Vortex Spun Yarn
    Textile Research Journal, 2009
    Co-Authors: Jianyong Yu, Jianming Wu, Long Di Cheng
    Abstract:

    The principle and the process of yarn formation determine fiber migration and twist radial distribution in a yarn. Usually tracer fiber technology is introduced to discuss fiber configuration in the yarn body. There are few studies on fiber spatial configuration based on the principle and the process of yarn formation. In this paper, we discuss fiber spatial trajectory in vortex spun yarn from the viewpoint of the principle and the process of yarn formation. Based on the fiber movement rule, the parameter equations of fiber spatial trajectory in vortex spun yarn were established. The fiber spatial configuration and its influenced factors were analyzed. The research results showed that the fiber spatial configuration in vortex spun yarn consisted of the core fiber and the migration wrapper fiber as well as the regular wrapper fiber. The fiber spatial configuration in vortex spun yarn was affected by the following factors: delivery speed, distance from the Front Roller nip point to the hollow spindle, mean ...

Bojun Xi - One of the best experts on this subject based on the ideXlab platform.

  • Investigation of fiber trajectory affected by some parameter variables in vortex spun yarn
    Textile Research Journal, 2014
    Co-Authors: Long Di Cheng, Bojun Xi
    Abstract:

    The principle and process of yarn formation determines fiber trajectory in a yarn. The objective of this paper was to investigate the effect of some parameter variables on the fiber trajectory of vortex spun yarn produced by the MVS No. 861 spinner, based on tracer fiber and image mosaics techniques. Some typical fiber configurations in vortex spun yarn were also observed. It was found that fiber trajectories in vortex spun yarn are affected significantly by the following parameters: fiber specification, distance between the Front Roller nip point and the tip of the hollow spindle, nozzle pressure, and yarn delivery speed, as well as yarn linear density. Some typical fiber configurations of vortex spun yarn include straight, ideal trajectory, hooked (trailing, leading, and both ends), looped, and entangled. Increasing the fiber length or decreasing the distance between the Front Roller nip point and the tip of the hollow spindle will result in an increase of the core fiber length in vortex spun yarn. The ...

  • Effect of Some Variables on the Fibre Packing Pattern in a Yarn Cross-section for Vortex Spun Yarn
    Fibres & Textiles in Eastern Europe, 2014
    Co-Authors: Shaoming Zheng, Long Di Cheng, Bojun Xi
    Abstract:

    This paper examined the influence of various parameters such as fibre fineness, yarn count, distance from the Front Roller nip point to the hollow spindle, nozzle pressure and yarn delivery speed on the fibre packing pattern in a yarn cross-section for vortex spun yarn. Cross-section images of vortex spun yarns were used to evaluate the fibre packing pattern. Results from different variables influencing the fibre packing pattern for vortex spun yarn were also analysed. The results indicated that the fibre fineness, yarn count, distance from the Front Roller nip point to the hollow spindle, nozzle pressure and yarn delivery speed are all significant parameters for yarn hairiness and fibre packing density in a vortex spun yarn cross-section.

Liu Xinjin - One of the best experts on this subject based on the ideXlab platform.

  • Effects of spinning process and core yarn contents on yarn shape retention
    International Journal of Clothing Science and Technology, 2019
    Co-Authors: Wei Yanhong, Liu Xinjin, Su Xuzhong, Zhao Zhimin
    Abstract:

    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.,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.,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.,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.

  • Research on yarn qualities modified by mechanical false-twisting device
    The Journal of The Textile Institute, 2019
    Co-Authors: Liu Xinjin, Su Xuzhong, Song Juan
    Abstract:

    AbstractIn the ring-spinning process, the area between the Front Roller nip and twisting point is spinning triangle, and its geometry influences the fiber tension distribution in the spinning trian...

  • Numerical simulation of flow field in complete condensing spinning: effects of suction unit and guiding device
    The Journal of The Textile Institute, 2015
    Co-Authors: Su Xuzhong, Weidong Gao, Liu Xinjin
    Abstract:

    Complete condensing spinning (CCS) is one kind of pneumatic compact spinning. A kind of hollow Roller with strip groove structure on the surface is used to condense the fiber bundle and improve the yarn qualities. In this paper, the numerical simulation of flow field in CCS is studied using fluent software. Using AutoCAD Software, according to the physical parameters of the practical system, a three-dimensional (3D) model of the condensing zone is established firstly. Then, the numerical simulations of the flow field in CCS were presented. Three kinds of suction units, straight-type, long-skewed, and short-skewed, and three kinds of guiding devices, A-type, B-type, and C-type, were discussed. Corresponding simulations in the Front, middle, and back condensing zone and arc line along the Front Roller surface direction were given and analyzed comparatively. It is shown that the flow field distribution in CCS is stable and can condense the fibers well. The shape of suction unit may mainly influence the outpu...

  • Research on fiber tension at asymmetric spinning triangle using the finite-element method
    The Journal of The Textile Institute, 2015
    Co-Authors: Liu Xinjin, Su Xuzhong
    Abstract:

    Spinning triangle is a critical zone in the ring spinning process of staple yarn, whose geometry influences the fiber tension distribution in the spinning triangle directly and determines the spun yarn qualities. In ring spinning, the spinning triangle is often asymmetric due to the inclination angle of the spinning tension or the migration of the axis fiber at the Front Roller nip. Therefore, in this paper, the fiber tension distributions in the asymmetric spinning triangle due to the migration of the axis fiber at the Front Roller nip were studied using the finite element method (FEM). In the direct finite-element model, the initial strain of the axis fiber is set as zero, and the accidental fiber tensions would be produced due to the asymmetric distributions of the initial strain on fibers in the two sides of the spinning triangle. Then, an effective finite-element model of the asymmetric spinning triangle with right (left) axis fiber migration for calculating the fiber tension is built by composing an...

  • Numerical analysis of fibers tensions in the Siro-spinning triangle using finite element method
    Fibers and Polymers, 2015
    Co-Authors: Liu Xinjin, Su Xuzhong, Zhang Hong
    Abstract:

    Siro-spinning is a new kind of modified ring spinning method and achieved by feeding two rovings simultaneously, which have three spinning triangles including two primary spinning triangles and one final spinning triangle. In this paper, by using finite element method (FEM), the quantitative relationships between the fiber tension in the Siro-spinning triangle and some chosen important spinning parameters are investigated. The constituent fibers in the Siro-spinning triangle are considered as three-dimensional elastic beam elements with tensile, compressive, torsion, and bending capabilities. Then, the finite element model of Siro-spinning triangle is constructed under the assumption that the ends of all fibers gripped in the Front Roller nip distribute evenly, and the initial strain of the central fiber in each primary triangle is set as zero. Finally, the effects of some more important parameters of the Siro-spinning triangle, including the spinning yarn count, spinning tension, yarn twist, the distance between two feeding bell mouths on fiber tension distributions, are numerically examined and their quantitative relationships are discussed in detail. The accuracy of the proposed FEM model in calculating the fiber tension distribution of the Siro-spinning triangle has been validated by comparing it with our earlier theoretical models. Furthermore, the spinning experiments with different progress parameters were made, and the properties of spun yarns were evaluated and analyzed.

Su Xuzhong - One of the best experts on this subject based on the ideXlab platform.

  • Effects of spinning process and core yarn contents on yarn shape retention
    International Journal of Clothing Science and Technology, 2019
    Co-Authors: Wei Yanhong, Liu Xinjin, Su Xuzhong, Zhao Zhimin
    Abstract:

    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.,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.,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.,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.

  • Research on yarn qualities modified by mechanical false-twisting device
    The Journal of The Textile Institute, 2019
    Co-Authors: Liu Xinjin, Su Xuzhong, Song Juan
    Abstract:

    AbstractIn the ring-spinning process, the area between the Front Roller nip and twisting point is spinning triangle, and its geometry influences the fiber tension distribution in the spinning trian...

  • Numerical simulation of flow field in complete condensing spinning: effects of suction unit and guiding device
    The Journal of The Textile Institute, 2015
    Co-Authors: Su Xuzhong, Weidong Gao, Liu Xinjin
    Abstract:

    Complete condensing spinning (CCS) is one kind of pneumatic compact spinning. A kind of hollow Roller with strip groove structure on the surface is used to condense the fiber bundle and improve the yarn qualities. In this paper, the numerical simulation of flow field in CCS is studied using fluent software. Using AutoCAD Software, according to the physical parameters of the practical system, a three-dimensional (3D) model of the condensing zone is established firstly. Then, the numerical simulations of the flow field in CCS were presented. Three kinds of suction units, straight-type, long-skewed, and short-skewed, and three kinds of guiding devices, A-type, B-type, and C-type, were discussed. Corresponding simulations in the Front, middle, and back condensing zone and arc line along the Front Roller surface direction were given and analyzed comparatively. It is shown that the flow field distribution in CCS is stable and can condense the fibers well. The shape of suction unit may mainly influence the outpu...

  • Research on fiber tension at asymmetric spinning triangle using the finite-element method
    The Journal of The Textile Institute, 2015
    Co-Authors: Liu Xinjin, Su Xuzhong
    Abstract:

    Spinning triangle is a critical zone in the ring spinning process of staple yarn, whose geometry influences the fiber tension distribution in the spinning triangle directly and determines the spun yarn qualities. In ring spinning, the spinning triangle is often asymmetric due to the inclination angle of the spinning tension or the migration of the axis fiber at the Front Roller nip. Therefore, in this paper, the fiber tension distributions in the asymmetric spinning triangle due to the migration of the axis fiber at the Front Roller nip were studied using the finite element method (FEM). In the direct finite-element model, the initial strain of the axis fiber is set as zero, and the accidental fiber tensions would be produced due to the asymmetric distributions of the initial strain on fibers in the two sides of the spinning triangle. Then, an effective finite-element model of the asymmetric spinning triangle with right (left) axis fiber migration for calculating the fiber tension is built by composing an...

  • Numerical analysis of fibers tensions in the Siro-spinning triangle using finite element method
    Fibers and Polymers, 2015
    Co-Authors: Liu Xinjin, Su Xuzhong, Zhang Hong
    Abstract:

    Siro-spinning is a new kind of modified ring spinning method and achieved by feeding two rovings simultaneously, which have three spinning triangles including two primary spinning triangles and one final spinning triangle. In this paper, by using finite element method (FEM), the quantitative relationships between the fiber tension in the Siro-spinning triangle and some chosen important spinning parameters are investigated. The constituent fibers in the Siro-spinning triangle are considered as three-dimensional elastic beam elements with tensile, compressive, torsion, and bending capabilities. Then, the finite element model of Siro-spinning triangle is constructed under the assumption that the ends of all fibers gripped in the Front Roller nip distribute evenly, and the initial strain of the central fiber in each primary triangle is set as zero. Finally, the effects of some more important parameters of the Siro-spinning triangle, including the spinning yarn count, spinning tension, yarn twist, the distance between two feeding bell mouths on fiber tension distributions, are numerically examined and their quantitative relationships are discussed in detail. The accuracy of the proposed FEM model in calculating the fiber tension distribution of the Siro-spinning triangle has been validated by comparing it with our earlier theoretical models. Furthermore, the spinning experiments with different progress parameters were made, and the properties of spun yarns were evaluated and analyzed.

Hossein Hasani - One of the best experts on this subject based on the ideXlab platform.

  • Simulation Approach to Investigate the Effect of the Jet Structure and Air Pressure on the Performance of Siro-jet Spinning
    Fibres & Textiles in Eastern Europe, 2012
    Co-Authors: Hossein Hasani, M. Hasani
    Abstract:

    In this paper, the effects of different parameters on the hairiness of siro-jet spun yarns, such as the nozzle pressure, the distance between the Front Roller nip and inlet of the nozzle, and jet structure were investigated. Using the Taguchi method, it was concluded that the factor air pressure has the strongest effect and the factor distance between the Front Roller nip and inlet of the nozzle does not have a significant effect on the performance of the siro-jet spinning system in reducing yarn hairiness. A computational fluid dynamics model was developed to simulate the airflow pattern inside the jets. The effect of air pressure and the jet structure was simulated using Fluent 6.3 software. The application of an air-jet nozzle reduces yarn hairiness by 40%.

  • Application of air‐jet nozzle in short staple Siro spinning system
    Journal of The Textile Institute, 2011
    Co-Authors: A. Sherafati Nejad, Saeed Shaikhzadeh Najar, Hossein Hasani
    Abstract:

    With the objective of reducing the hairiness of Siro spun yarns, two types of air‐jet nozzle differing in the angle of sub‐holes and suitable for an air vortex ring spinning system were designed and fabricated. The performance of the JetSiro spinning system on short staple fiber materials and the effects of the different parameters on the hairiness of JetSiro spun yarns, such as nozzle pressure of compressed air, distance between Front Roller nip and inlet of nozzle, and nozzle structure, were investigated using the Taguchi method. The physical properties of JetSiro spun yarns with those of conventional Siro spun yarns were compared. The results show that the parameters, air pressure and distance between Front Roller nip and inlet of nozzle have the strongest and weakest effect on yarn hairiness. In addition, the optimum spinning conditions were determined. The application of the air‐jet nozzle exhibits significant reductions in yarn hairiness of 40%. The results revealed no significant effect of the air‐...

  • application of air jet nozzle in short staple siro spinning system
    Journal of The Textile Institute, 2011
    Co-Authors: Sherafati A Nejad, Saeed Shaikhzadeh Najar, Hossein Hasani
    Abstract:

    With the objective of reducing the hairiness of Siro spun yarns, two types of air‐jet nozzle differing in the angle of sub‐holes and suitable for an air vortex ring spinning system were designed and fabricated. The performance of the JetSiro spinning system on short staple fiber materials and the effects of the different parameters on the hairiness of JetSiro spun yarns, such as nozzle pressure of compressed air, distance between Front Roller nip and inlet of nozzle, and nozzle structure, were investigated using the Taguchi method. The physical properties of JetSiro spun yarns with those of conventional Siro spun yarns were compared. The results show that the parameters, air pressure and distance between Front Roller nip and inlet of nozzle have the strongest and weakest effect on yarn hairiness. In addition, the optimum spinning conditions were determined. The application of the air‐jet nozzle exhibits significant reductions in yarn hairiness of 40%. The results revealed no significant effect of the air‐...

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