Relevant bibliographies by topics / Twist insertion process][Yarn spinning

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  3. Conference papers

Academic literature on the topic 'Twist insertion process][Yarn spinning'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Twist insertion process][Yarn spinning"

1

Pei, Zeguang, and Chongwen Yu. "Investigation on the Dynamic Behavior of the Fiber in the Vortex Spinning Nozzle and Effects of Some Nozzle Structure Parameters." Journal of Engineered Fibers and Fabrics 6, no. 2 (June 2011): 155892501100600. http://dx.doi.org/10.1177/155892501100600203.

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Vortex spinning, which adopts high speed airflow to insert twist into the yarn, is one of the most promising technological innovations in the textile industry. In vortex spinning, the dynamic behavior of the fiber inside the nozzle, which involves fiber-airflow interaction and fiber-wall contact, plays an important role in the twist insertion process. This paper investigates the airflow characteristics and the fiber dynamic behavior inside the vortex spinning nozzle via a two-dimensional numerical model with the fiber-airflow interaction and fiber-wall contact included. The fiber is assumed to be isotropic, elastic material. The airflow inside the nozzle is assumed to be turbulent, viscous and incompressible. The numerical results show that two vortices with momentarily changed sizes are created upstream of the jet orifice outlets. The imbalance of the pressure around the fiber causes the fiber to move and deform. The trailing end of the fiber rotates with wave shape within the nozzle chamber for several periods to insert twist into the yarn. Based on the model, the effects of three nozzle structure parameters – the jet orifice angle, jet orifice diameter, distance between the nozzle inlet and the hollow spindle, on the dynamic behavior of the fiber, and in turn, the yarn structure and tensile property are investigated. The results show that the appropriate jet orifice angle for obtaining the best yarn tenacity is 70°. The optimal jet orifice diameter is 0.4 mm. The spun yarn has the highest tenacity when the distance between the nozzle inlet and the hollow spindle is 14 mm.
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2

Cui, Rui Fang, Zhi Yuan Peng, and Sai Nan Wei. "Research on the Spinning Process of Ni-Fe Fibers." Advanced Materials Research 1053 (October 2014): 103–6. http://dx.doi.org/10.4028/www.scientific.net/amr.1053.103.

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Based on the physical properties of Ni-Fe fiber, the orthogonal design was adopted to determine the parameters including roving twist, back zone drafting multiple and yarn twist, and the strength and wear resistance of the produced five kinds of yarns were tested and analyzed. The results show that to solve the problem of mixing uniformity of Ni-Fe Fibers, the suitable drawing numbers can be adopted. And the appropriate roving twist, spinning back zone drafting multiple and yarn twist are key factor of resultant yarn.
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Yin, R., XM Tao, and BG XU. "Variation of false twist on spinning process stability and resultant yarn properties in a modified ring spinning frame." Textile Research Journal 88, no. 16 (June 5, 2017): 1876–92. http://dx.doi.org/10.1177/0040517517712099.

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Twisting is an important process to form a continuous yarn from short fibers and to determine the structure and properties of the resultant yarn. This article reports on the effect of variation of false twist on process stability and resultant yarn quality in a modified ring spinning frame. Based on twist kinematics, three practical cases that cause twist variations in the spinning process are investigated, namely step function, rectangular function and periodic function changes in false twist. The simulation results are validated by experiments and a good agreement has been demonstrated. The resultant properties of yarn within 30% periodic change in false twist demonstrated insignificance compared with yarn without variation. With the developed model, essential system parameters are numerically examined and their quantitative relationships are studied. The practical implications are discussed.
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Shao, Ruiqi, Longdi Cheng, Yanping Yu, Jianxin Xu, and Jianming Wu. "Research on the mechanism of the modified ring-spinning system using a dynamic twist-resistant device and its yarn quality." Textile Research Journal 89, no. 15 (October 31, 2018): 3169–77. http://dx.doi.org/10.1177/0040517518807452.

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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.
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5

Yanhong, Wei, Xinjin Liu, Xuzhong Su, and Zhao Zhimin. "Effects of spinning process and core yarn contents on yarn shape retention." International Journal of Clothing Science and Technology 32, no. 4 (December 26, 2019): 457–69. http://dx.doi.org/10.1108/ijcst-11-2018-0142.

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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.
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6

Cui, Hong, and Chongwen Yu. "A Mathematical Model for Self-Twist Yarn Spinning Process." Research Journal of Textile and Apparel 18, no. 1 (February 1, 2014): 1–5. http://dx.doi.org/10.1108/rjta-18-01-2014-b001.

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A mathematical model is established for self-twist spinning process by applying laws of fluid mechanics (i.e. mass conservation and momentum conservation). The motion curve of the convergent point was determined and the convergence point was decided by densities and velocities of two fed-in strands and the resultant self-twist yarn, independent of their mechanical properties. The experimental verification proves that the motion trajectory of the convergence point reaches a better agreement with the theoretical trajectory. The results provide general way to study the self-twist yarn spinning process and optimize the process parameters.
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7

Liu, Shu Qiang, Jin Ming Dai, Hu Sheng Jia, Xu Guang Liu, and Bing She Xu. "Effect of Siro-Spun Processing Parameters on Properties of 55/45 Flax/Cotton Blended Yarn." Advanced Materials Research 331 (September 2011): 502–11. http://dx.doi.org/10.4028/www.scientific.net/amr.331.502.

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Limited studies exist related to the siro-spun spinning of flax ( Linum usitatissimum L.) and cotton (Gossypium hirsutum) blends. The purpose of this study was to determine the influence of various siro-spun processing parameters, including twist factor, space between two rovings and specification of traveler, on yarn qualities, such as yarn hairiness, tenacity and evenness. Results show that both specification of traveler and space between two rovings significantly influenced yarn hairiness and evenness, and heavier traveler and greater space led to decreased hairiness, but bad evenness. Twist factor influenced yarn evenness highly significantly, and smaller twist factor led to worse yarn evenness. Results also indicate the optimum levels of siro-spun process parameters as follows: twist factor αm = 150, space between two rovings 8 mm, traveler Fo 5/0. In relation to the general ring-spinning yarn, the siro-spun spinning yarns had decreased hairiness, little increased tenacity and similar evenness.
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8

Hussain, Tanveer, Farooq Ahmed Arain, and Zulfiqar Ali Malik. "Use of Taguchi Method and Grey Relational Analysis to Optimize Multiple Yarn Characteristics in Open-End Rotor Spinning." Autex Research Journal 17, no. 1 (March 1, 2017): 67–72. http://dx.doi.org/10.1515/aut-2015-0046.

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Abstract Rotor speed and twist per metres (tpm) are two key parameters in open-end rotor spinning of cotton yarns. High spinning productivity can be obtained by keeping the rotor speed high and twist level as low as possible. However, too high rotor speed may result in yarn imperfections and too low twist level may result in lower tenacity yarns. This study aimed at optimising the multiple yarn characteristics in open-end rotor spinning using the Taguchi method and the grey relational analysis. Cotton yarn samples of 30 tex were produced on rotor spinning machine with different twist levels (i.e. 500, 550, 600 and 700 tpm) at different rotor speeds (i.e. 70,000, 80,000, 90,000 and 100,000 rpm) according to the Taguchi design of experiment. Optimal spinning process parameters were determined using the grey relational grade as the performance index. It was concluded that for the cotton fibres and yarn count used in this study, optimum properties of the yarns could be obtained at 90,000 rpm rotor speed and 700 tpm.
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9

Zhang, Ru Quan, Jian Qiang Li, Yu He, and Hui Jiang. "Prediction of Yarn Quality by Support Vector Machine." Advanced Materials Research 503-504 (April 2012): 1429–32. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.1429.

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For the prediction of yarn quality, this paper presents method to predict the quality of the spinning by a support vector machine. The input parameters to support vector machines including density of coarse yarn, roving twist factor, yarn linear density, yarn twist factor , the output variable is the CV values of spinning, breaking strength, establishment prediction model of CV values, breaking strength SVM. The results showed that: 11 groups of training samples randomly selected from 13 groups samples, two groups as predict sample, forecast errors are below 5% with high accuracy. This research provides a new approach for the spinning process design and quality control.
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10

Shao, Ruiqi, Longdi Cheng, Ning Pan, Wenliang Xue, and Yanping Yu. "Theoretical analysis and simulation of twist blockage and yarn tension in a dynamic twist-resistant device." Textile Research Journal 90, no. 15-16 (January 20, 2020): 1741–48. http://dx.doi.org/10.1177/0040517519900669.

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In the ring spinning system, a dynamic twist-resistant device has been applied to improve yarn quality. In this paper, a mechanical model quantifies the relationship between twist blockage, yarn tension, and the parameters of the device and yarn when yarn passes through the dynamic twist-resistant device. During the modeling process, the force applied by the twist-resistant device was considered, and the twisting torque was precisely calculated by yarn tension rather than calculated by the assumption that yarn-twisting torque is linearly related to the yarn twist. Finally, twist blockage and yarn tension are given as a function of the normal force applied by the device, the radii of cylinders in the device, warp angle, deviation angle and radius of the yarn. The simulation results are presented and analyzed.
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Dissertations / Theses on the topic "Twist insertion process][Yarn spinning"

1

Miao, Menghe. "The insertion of twist into yarns by means of air-jets." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329209.

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Conference papers on the topic "Twist insertion process][Yarn spinning"

1

Xu, BinGang, and XiaoMing Tao. "Investigation of Yarn Twist Propagation in Rotor Spinning." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39488.

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This paper proposed an integrated mechanical approach for yarn dynamics in rotor spinning, especially the twist propagation in the yarn forming process from fibers collected in a rotor groove to the twisted yarn at the twist stopper. Equations of dynamic equilibrium in different yarn forming regions were established, and further, expressed in terms of dimensionless variables. Then the yarn tension and twist distribution, considering the dynamic coupling effects between different regions under the steady spinning conditions, were numerically simulated, in which influences of various dimensionless parameters of rotor spinning on the yarn tension and twist distributions were discussed in details.
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