Journal articles: 'Warp knitting'

1

Yang, Xu, Zhang Ziyu, Li Angang, and Sheng Xiaowei. "Noise Source Identification Method for a Warp Machine Based on MEEMD_AIC." Fibres and Textiles in Eastern Europe 28, no. 3(141) (June 30, 2020): 55–61. http://dx.doi.org/10.5604/01.3001.0013.9019.

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In order to recognise the noise source of a warp knitting machine, a method based on Modified Ensemble Empirical Mode Decomposition (MEEMD) and Akaike Information Criterion (AIC) is proposed. The MEEMD_AIC method is applied to measure the noise signal of a warp knitting machine and analyse every single effective component selected. Noise source identification is realised by combining the vibration signal characteristics of the main parts of the warp knitting machine. Firstly, MEEMD is used to decompose the measured noise signal of the warp knitting machine into a finite number of intrinsic mode function (IMF) components. Then, singular value decomposition (SVD) is performed on the covariance matrix of the component matrix to get the eigen value of the matrix. Next, the number of effective components is estimated based on the AIC criterion, and the effective components are selected by combining the energy characteristic index and the Pearson correlation coefficient method. The results show that the noise signal of the warp knitting machine is a mixture of multiple noise source signals. The main noise sources of the warp knitting machine, including the vibration of the pulling roller, the main shaft of the loop forming mechanism and the push rod of the guide bar traverse the mechanism, provide theoretical support for recognition of the active noise reduction of the warp knitting machine using the MEEMD_AIC method.

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AIBARA, HIDEKATSU. "Development of Warp Knitting Machine." Sen'i Gakkaishi 43, no. 1 (1987): P18—P21. http://dx.doi.org/10.2115/fiber.43.p18.

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3

Liu, Xing, and Xuhong Miao. "Analysis of yarn tension based on yarn demand variation on a tricot knitting machine." Textile Research Journal 87, no. 4 (July 21, 2016): 487–97. http://dx.doi.org/10.1177/0040517516632473.

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To date, the trend in the development of knitting promotes higher requirements for warp tension control, and the fluctuation of knitting warp finally comes down to the imbalance between yarn demand and feed while forming every loop. According to warp knitting machine characteristics, four typical points are chosen to calculate the value of yarn demand, and in this way a model is built to obtain and plot the overall change trend in yarn demand in one knitting cycle. Combined with the theoretical tension curve calculated based on the yarn demand and the measured one, it is verified as coincident. The model is useful for analyzing the factors causing warp dynamic tension variation, and lays the groundwork for accurate active tension compensation.

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4

Zhang, Lei, Jin Hua Jiang, and Nan Liang Chen. "Relationship between Knitting Parameters and Mechanical Properties of Warp Knitting Mesh Fabric." Advanced Materials Research 627 (December 2012): 374–77. http://dx.doi.org/10.4028/www.scientific.net/amr.627.374.

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The warp knitting parameters are important to determine the knitting process and the mechanical properties of warp knitting mesh fabric. In this work, the relationship between different knitting parameters (mesh side length and the let-off value) and the mechanical properties were studied. The effect of knitting parameters on the tensile strength and elongation was investigated by experiment. As a result, the relationship between the mechanical properties and the two parameters was found, and the optimization values of two parameters which could improve the isotropy of mesh fabric were given.

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5

Michalak, Andrzej, Maciej Kuchar, and Zbigniew Mikołajczyk. "Impact of Whip Roller Parameters on Warp Dynamic Loads for 3D Fabrics Made on a Four-Comb Warp-Knitting Machine." Autex Research Journal 20, no. 1 (March 1, 2020): 73–77. http://dx.doi.org/10.2478/aut-2019-0025.

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AbstractThe most advantageous geometry of the warp feeding system was determined from the viewpoint of compensating temporary changes in the warp length during the technological cycle of a four-comb warp-knitting machine. Dynamic simulations of the feeding system were carried out for 3 different lengths of the shift of the slider with a guide bar – designating variants (series) of the cross-sectional sizes of the 3D knitted fabrics. The courses of instantaneous warp tensions during the operating cycle of the warp-knitting machine were presented. Limit dynamic loads of the warp were determined and presented as a function of natural frequency of the whip roller. Based on the criterion of the smallest dynamic loads of the warp, the optimum natural frequencies of the whip roller were determined. In the analyzed range of the whip roller parameters, they are 3–6 times greater than the operation frequency of the warp-knitting machine.

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6

TANIGUCHI, Masayoshi, and Hiroyuki MATSUDA. "Garment Length Technology of Warp Knitting." Sen'i Kikai Gakkaishi (Journal of the Textile Machinery Society of Japan) 52, no. 11 (1999): P449—P454. http://dx.doi.org/10.4188/transjtmsj.52.11_p449.

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7

Chaban, V. V., and B. F. Pipa. "The calculation of warping spools of warp-knitting machines." Odes’kyi Politechnichnyi Universytet. Pratsi, no. 2 (December 15, 2014): 64–70. http://dx.doi.org/10.15276/opu.2.44.2014.13.

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8

Qin, Zhi Gang, and Bao Shi. "Investigation on Tensile Properties of Two Guide Bar Warp Knitted Fabric Reinforced Composites." Advanced Materials Research 602-604 (December 2012): 76–79. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.76.

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The composite laminates are produced by manual molding technology using two guide bar warp knitted fabrics of glass fiber as reinforcement and epoxy resin as matrix. The tensile properties of composites in the course, wale and diagonal directions are tested on the universal material testing machine. The influences of warp knitting stitch structures for mechanical performance of the composites are discussed. The results show that the tensile stress/strain curves of two guide bar warp knitted fabric reinforced composites were nonlinear. The tensile properties of composites possess obvious anisotropic characteristics. The tensile strengths and modulus of the warp knitting fabric composites depend on the yarn numbers bearing load along tensile direction, which are related to the stitches and structural parameters of warp knitted fabrics.

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9

Cong, Honglian, Hui Lei, Yongchao Zhang, Aijun Zhang, and Pibo Ma. "Weft-knitted lace fabric simulation based on the spring-mass model." International Journal of Clothing Science and Technology 29, no. 1 (March 6, 2017): 60–68. http://dx.doi.org/10.1108/ijcst-10-2015-0118.

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Purpose The obtained simulation structures could reflect the appearances and the features of the fabrics. The purpose of this paper is to promote a lot for design and manufacturing of weft-knitted lace fabrics (WKLF). Design/methodology/approach The advantages of WKLF compared with warp-knitted ones were displayed. The formation mechanism of the WKLF was analyzed with employing the mechanics principles. Spring-mass model was proposed in this paper to achieve the simulation of the fabrics. End mass points and intermediate mass points were involved in the model. The displacement of end mass points was considered the dominance and the foundation to settle the positions of all the mass points. Findings A novel jacquard lace style fabric with pattern-background effect knitted on circular knitting machine were put forward, which were different from the traditional lace fabrics manufactured on the warp knitting machines. Originality/value First, as the manufacturing equipment, circular knitting machine costs much less than warp knitting machine; second, the elastic performance along weft direction of WKLF is more excellent than that of warp-knitted ones. Third, the excellent extensibility gives nice comfort; furthermore, long floating threads do not exist on the WKLF surface, so that the snag will be avoided.

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10

Pohlen, Vivienne, Andreas Schnabel, Florian Neumann, and Thomas Gries. "Optimisation of the warp yarn tension on a warp knitting machine." Autex Research Journal 12, no. 2 (October 1, 2012): 29–33. http://dx.doi.org/10.2478/v10304-012-0006-8.

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Abstract Investigations (calculations) based on a warp yarn tension analysis on a warp knitting machine with multiaxial weft yarn insertion allow prospective reduced yarn tension differences in technical warp knits. From this a future opportunity is provided to substitute the subjective warp let-off adjustment by a model of tension control. The outcome of this is a higher reproducibility with associated increasing process reliability and rising product quality.

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Qin, Zhi Gang, and Xiao Hong Ma. "Investigation on Tensile Properties of Weft Insertion Warp Knitted Fabric Reinforced Composites." Advanced Materials Research 821-822 (September 2013): 1200–1203. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.1200.

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Warp knitted fabrics possess a number of changes in the structures, so they do have great advantages on the property design of composites. The three kinds of weft insertion warp knitted fabrics are knitted on a Raschel latch needle warp knitting machine with glass continuous-filament yarns. The warp knitted fabric/ unsaturated polyester resin composite laminates are produced by manual molding technology. The tensile properties of composites in the course, wale and diagonal directions are tested on the universal material testing machine. The results show that the tensile stress/strain curves of the composites were nonlinear. The tensile properties of the composites possess obvious anisotropic characteristics. The tensile strengths and elastic modulus of the warp knitting composites depend on the needle space number of inlaid yarn, fabric density and structure.

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12

Taniguchi, M. "Application of computer for warp knitting machine." Sen'i Kikai Gakkaishi (Journal of the Textile Machinery Society of Japan) 40, no. 1 (1987): P45—P51. http://dx.doi.org/10.4188/transjtmsj.40.p45.

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13

Chang, Yuping, and Pibo Ma. "Fabrication and property of auxetic warp-knitted spacer structures with mesh." Textile Research Journal 88, no. 19 (July 3, 2017): 2206–13. http://dx.doi.org/10.1177/0040517517716910.

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For the purpose of reconstructing a three-dimensional auxetic structure adopting spacer warp-knitting techniques, a simple mathematical model based on the structure of auxetic warp-knitted spacer hexagonal meshes was established and several samples were produced using an E22 RD7/2-12EN warp-knitting machine. It is predicted from synthesizing the results of both mathematical modeling and experimental sampling that auxetic performance of this structure mainly depends on the contraction distortion before stretching in three directions, especially in the y-axis. When it comes to knitting parameters, yarn fineness, machine gauge, fabric density, movement of guide bars, and inclination angle of wales all matter for the auxetic performance, which is also affected by the stiffness of materials and the lodging of spacer yarns. It is also concluded that successive inlaying in the same direction of the spacer guide bar favors contraction distortion in the y-axis, which means auxetic performances can be more easily achieved in this way.

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14

Zhang, Lingjie, Xuhong Miao, and Ailan Wan. "Calculation and Analysis of Horizontal and Vertical Lapping Angles in Tricot Warp Knitting." Autex Research Journal 19, no. 2 (June 1, 2019): 173–80. http://dx.doi.org/10.1515/aut-2018-0045.

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Abstract The lapping angle, which affects the style and quality of production, has been studied as a parameter of weft knitting. But the importance of the lapping angle has not been considered during the warp-knitting cycle. This paper shows that the lapping angle exists in the process of warp knitting and can be divided into horizontal and vertical lapping angles. Models for the lapping angles of closed and open loops were devised, and the lapping angles (horizontal and vertical lapping angles) of closed and open loops were calculated and analyzed. Furthermore, the paper seeks to investigate the factors that influence the lapping angle of tricot warp-knitted fabrics and summarize the rules. Moreover, the vertical lapping angle can affect the loop coverage. Results reveal that the decrease in number of underlaps and an increase in take-off density enables loops of the front guide bar to show on the face of the fabric. Moreover, it is also advantageous for an apparent front loop visibility when the front guide bar knits in open loop.

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15

Chen, Qing, Pibo Ma, Haiwen Mao, Xuhong Miao, and Gaoming Jiang. "The Effect of Knitting Parameter and Finishing on Elastic Property of PET/PBT Warp Knitted Fabric." Autex Research Journal 17, no. 4 (December 20, 2017): 350–60. http://dx.doi.org/10.1515/aut-2017-0014.

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Abstract This study investigated the elastic elongation and elastic recovery of the elastic warp knittedfabric made of PET( polyethylene terephthalate) and PBT(polybutylene terephthalate) filament. Using 50/24F PET and 50D/24F PBT in two threadingbars, the tricot, locknit and satin warp knitted fabrics were produced on the E28 tricot warpknitting machine. The knitting parameters influencing the elastic elongation under 100N wereanalyzed in terms of fabric structure, yarn run-in speed and drawing density set on machine.Besides, dyeing temperature and heat setting temperature/time were also examined in order toretain proper elastic elongation and elastic recovery. The relationship between elastic elongationand knitting parameter and finishing parameter were analyzed. Finally, the elastic recovery ofPET/PBT warp knitted fabric was examined to demonstrate the elastic property of final finishedfabric. This study could help us to further exploit the use of PET/PBT warp knitted fabric in thedevelopment of elastic garment in future.

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16

TANIGUCHI, Masayoshi. "Knit. Advanced technology in recent warp-knitting machine." Sen'i Kikai Gakkaishi (Journal of the Textile Machinery Society of Japan) 51, no. 7 (1998): P378—P386. http://dx.doi.org/10.4188/transjtmsj.51.7_p378.

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17

Prążyńska, Aleksandra, and Zbigniew Mikołajczyk. "Identification of the Process of Dynamic Stretching of Threads in Warp-Knitting Technology." Autex Research Journal 17, no. 4 (December 20, 2017): 334–43. http://dx.doi.org/10.1515/aut-2016-0039.

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Abstract The publication presents a theoretical study of the susceptibility of rheological models of threads to dynamic stretching in the context of modern, highly efficient textile technologies. Input parameters of the four analyzed models, the Kelvin-Voigt model, the Maxwell model, Standard model 2, and the Zener model, corresponded to the actual values of the coefficients of viscosity, elasticity, kinematic and dynamic loading, and stretching speed for the analyzed polyester silk threads produced in a knitting process, with knitting speeds from 700 to 1,600 courses/min. The research proves that the tested thread models behave differently in the stretching process-the Kelvin-Voigt model is sensitive to both the increases in kinematic loading and viscosity coefficient, Standard model 2 is only susceptible to dynamic stiffness, and the Zener model is significantly sensitive to kinematic loading. All responses of the models increase with the increase in stretching speeds. The obtained results indicate substantial “accuracy tolerance” in setting input parameters while identifying dynamics of the knitting process on warp-knitting machines.

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18

Zhao, Shuaiquan, Hong Hu, Hasan Kamrul, Yuping Chang, and Minglonghai Zhang. "Development of auxetic warp knitted fabrics based on reentrant geometry." Textile Research Journal 90, no. 3-4 (August 1, 2019): 344–56. http://dx.doi.org/10.1177/0040517519866931.

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This paper reports a novel method to fabricate auxetic warp knitted fabrics on a tricot warp knitting machine based on a special structure design and knitting process. Three auxetic warp knitted structures were successfully developed and all of them were designed to form a reentrant hexagonal geometry to acquire an auxetic effect. To provide the fabrics with reentrant frames, elastomeric yarns and stiff yarns were used to form the elastic underlaps and stiff underlaps, respectively. While the elastic underlaps can keep the reentrant structures stable, the stiff underlaps can support the reentrant structures to keep their reentrant frames. To alleviate the transfer of yarns in the loops under tension, an additional front yarn guide bar was used to feed binding yarns to basic reentrant structures. After knitting, all the fabrics were subjected to a heat setting process to keep their shape and a tensile test to assess their auxetic behavior. The experimental results showed that all the fabrics exhibited an obvious auxetic behavior within a wide range of strain. In particular, the fabrics retained auxetic behavior until breaking when stretched in the wale direction, and the Poisson’s ratio of the fabrics could be as low as –0.5. On the other hand, the fabrics exhibited a large tensile elongation when stretched in the course direction and their Poisson’s ratios changed from negative to positive after the tensile strain exceeded a certain value.

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19

Feng, Sun. "STUDY OF YARN APPEARANCE FOR TWO-BAR WARP KNITTING." Research Journal of Textile and Apparel 7, no. 1 (February 2003): 19–28. http://dx.doi.org/10.1108/rjta-07-01-2003-b003.

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20

Mermelstein, S. P., D. Hale, M. Acar, M. R. Jackson, and K. Roberts. "Patterning servo-mechanism for a circular warp knitting machine." Mechatronics 11, no. 6 (September 2001): 617–30. http://dx.doi.org/10.1016/s0957-4158(00)00039-8.

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21

Roy, A. K., I. Porat, and P. Grosberg. "Reduction of Within-cycle Tension Variations in Warp-knitting." Journal of the Textile Institute 86, no. 4 (January 1995): 682–89. http://dx.doi.org/10.1080/00405009508659044.

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Lou, C. W., C. H. Lei, C. W. Chang, J. M. Chen, Chan-Hung Hsu, C. B. Huang, and J. H. Lin. "Optimal process of warp-knitting fabric with multiple functions." Journal of Materials Processing Technology 192-193 (October 2007): 323–27. http://dx.doi.org/10.1016/j.jmatprotec.2007.04.060.

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23

Дворжак, В. М. "ЗАСТОСУВАННЯ МЕХАНІЗМУ ЧЕТВЕРТОГО КЛАСУ ДЛЯ ПРИВОДУ ВУШКОВИХ ГОЛОК ОСНОВОВ’ЯЗАЛЬНОЇ МАШИНИ." Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 146, no. 3 (January 11, 2021): 15–24. http://dx.doi.org/10.30857/1813-6796.2020.3.1.

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Development and research of functionally-adequate target mechanisms of technological machines of light industry with application of applied CAE-programs. Used the apparatus of vector algebra; analytical and numerical methods for determining the position functions of planar mechanisms containing a structural group of the fourth class of the second order, based on the vector transformation of coordinates; random search method for metric synthesis of flat mechanisms; methods of computer visualization and animation of kinematic schemes of flat mechanisms of higher classes. Mathematical models describing the position functions of the mechanism of eyelets of a warp knitting machine containing a structural group of the fourth class of the second order with rotating kinematic pairs in the form of angles of moving links, free vectors constructed on these links and radius vectors of characteristic points of the mechanism as a function of the angle of rotation of the master crank. The geometrical parameters of the flat six-link mechanism of eyelets for the warp knitting machine containing the structural group of the fourth class of the second order with rotating kinematic pairs as a result of metric synthesis of the mechanism by random search in CAE-program are determined; computer circuit modeling of the obtained mechanism is performed; graphs of visualization and animation of the kinematic scheme of the received mechanism are constructed; identification of the kinematic scheme of the obtained mechanism for compliance with the accepted structure; the received graph of function of position of an auricular needle of the mechanism of the fourth class; the functions of the position of the eye needle of the new mechanism and the mechanism of the basic knitting machine OV-7 are compared. The structure of a flat six-link mechanism, containing structural groups of the fourth class of the second order with rotating kinematic pairs, is proposed for use as a drive in a warp knitting machine on the example of the mechanism of oscillating movement of eyelets. The geometric dimensions of the moving parts of the functionally adequate mechanism of the fourth class for the drive of the eye needles of the basic knitting machine are determined. Software blocks for automated computer metric synthesis and calculation of link angles and radius vectors of characteristic points of the mechanism in the CAE program have been created. Practical Value is to use the results for the design and construction of flat mechanisms of the fourth class with rotating kinematic pairs of warp knitting machines, in which the working bodies make stops during the work process.

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24

Дворжак, В. М. "ЗАСТОСУВАННЯ МЕХАНІЗМУ ЧЕТВЕРТОГО КЛАСУ ДЛЯ ПРИВОДУ ВУШКОВИХ ГОЛОК ОСНОВОВ’ЯЗАЛЬНОЇ МАШИНИ." Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 146, no. 3 (January 11, 2021): 15–24. http://dx.doi.org/10.30857/1813-6796.2020.3.1.

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Development and research of functionally-adequate target mechanisms of technological machines of light industry with application of applied CAE-programs. Used the apparatus of vector algebra; analytical and numerical methods for determining the position functions of planar mechanisms containing a structural group of the fourth class of the second order, based on the vector transformation of coordinates; random search method for metric synthesis of flat mechanisms; methods of computer visualization and animation of kinematic schemes of flat mechanisms of higher classes. Mathematical models describing the position functions of the mechanism of eyelets of a warp knitting machine containing a structural group of the fourth class of the second order with rotating kinematic pairs in the form of angles of moving links, free vectors constructed on these links and radius vectors of characteristic points of the mechanism as a function of the angle of rotation of the master crank. The geometrical parameters of the flat six-link mechanism of eyelets for the warp knitting machine containing the structural group of the fourth class of the second order with rotating kinematic pairs as a result of metric synthesis of the mechanism by random search in CAE-program are determined; computer circuit modeling of the obtained mechanism is performed; graphs of visualization and animation of the kinematic scheme of the received mechanism are constructed; identification of the kinematic scheme of the obtained mechanism for compliance with the accepted structure; the received graph of function of position of an auricular needle of the mechanism of the fourth class; the functions of the position of the eye needle of the new mechanism and the mechanism of the basic knitting machine OV-7 are compared. The structure of a flat six-link mechanism, containing structural groups of the fourth class of the second order with rotating kinematic pairs, is proposed for use as a drive in a warp knitting machine on the example of the mechanism of oscillating movement of eyelets. The geometric dimensions of the moving parts of the functionally adequate mechanism of the fourth class for the drive of the eye needles of the basic knitting machine are determined. Software blocks for automated computer metric synthesis and calculation of link angles and radius vectors of characteristic points of the mechanism in the CAE program have been created. Practical Value is to use the results for the design and construction of flat mechanisms of the fourth class with rotating kinematic pairs of warp knitting machines, in which the working bodies make stops during the work process.

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25

Li, Xiaoying, Gaoming Jiang, Xiaolin Nie, Pibo Ma, and Zhe Gao. "Knitting Technologies And Tensile Properties Of A Novel Curved Flat-Knitted Three-Dimensional Spacer Fabrics." Autex Research Journal 15, no. 3 (September 1, 2015): 191–97. http://dx.doi.org/10.1515/aut-2015-0006.

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AbstractThis paper introduces a knitting technique for making innovative curved three-dimensional (3D) spacer fabrics by the computer flat-knitting machine. During manufacturing, a number of reinforcement yarns made of aramid fibres are inserted into 3D spacer fabrics along the weft direction to enhance the fabric tensile properties. Curved, flat-knitted 3D spacer fabrics with different angles (in the warp direction) were also developed. Tensile tests were carried out in the weft and warp directions for the two spacer fabrics (with and without reinforcement yarns), and their stress–strain curves were compared. The results showed that the reinforcement yarns can reduce the fabric deformation and improve tensile stress and dimensional stability of 3D spacer fabrics. This research can help the further study of 3D spacer fabric when applied to composites.

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Xia, Wen, Wen Ren, and Sencai Lai. "New Design of a Boost Drive Circuit with an Energy Recovery Function for the Piezoelectric Jacquard Needle." Fibres and Textiles in Eastern Europe 29, no. 1(145) (February 28, 2021): 86–91. http://dx.doi.org/10.5604/01.3001.0014.5051.

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Aiming at the technical bottlenecks existing in the current warp knitting machine control system such as jacquard drive circuit, the design method of self-boosting power supply circuit integrated with jacquard driver is proposed for the embedded warp knitting machine jacquard control system for miniaturization design. The voltage boost circuit designed can boost the low voltage from the input of the working power supply to the high voltage for the output to drive the oscillation of the piezoelectric ceramic jacquard needles. Since the circuit adopts energy storage inductance instead of current-limiting resistor to optimize the driving circuit, it not only limits the forward charging current of the piezoelectric ceramic, but also effectively realize the energy recovery function. The effectiveness of the design method is verified by simulation.

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Zhang, Xiaohui, and Pibo Ma. "Application of Knitting Structure Textiles in Medical Areas." Autex Research Journal 18, no. 2 (June 1, 2018): 181–91. http://dx.doi.org/10.1515/aut-2017-0019.

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Abstract There are many kinds of medical textiles, such as woven textiles, non-woven textiles, braided textiles and knitted textiles. Non-woven medical textiles constitute more than 60% of the total medical textiles used, but are almost disposable ordinary medical textiles. While knitted fabrics forms a small part of the medical textiles, but are greatly applied in high-tech medical textiles, containing artificial blood vessels, hernia patches, cardiac support devices, knitted medical expandable metallic stents and tendon scaffolds. Knitting structures, including weft knitting structure and warp knitting structure. The knitted textiles are popular for their loose structure, greater flexibility, higher porosity, more flexible structure and better forming technology. The present article will introduce some knitting structures and materials applied in the medical textiles in accordance with non-implantable, implantable, extra-corporeal textiles and healthcare and hygiene products.

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Stumpf, H., E. Mäder, S. Baeten, T. Pisanikovski, W. Zäh, K. Eng, C. H. Andersson, I. Verpoest, and K. Schulte. "New thermoplastic composite preforms based on split-film warp-knitting." Composites Part A: Applied Science and Manufacturing 29, no. 12 (December 1998): 1511–23. http://dx.doi.org/10.1016/s1359-835x(98)00086-4.

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29

Ma, Xiao Hong, and Zhi Gang Qin. "Research on Mechanical Properties of Warp Knitted Spacer Fabric Composites." Advanced Materials Research 332-334 (September 2011): 1760–63. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.1760.

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Two kinds of warp-knitted spacer fabrics are knitted on a Raschel latch needle warp knitting machine with glass continuous-filament yarns. The glass/ unsaturated polyester resin composites are produced by manual molding technology. The tensile and flexural properties of composite specimens are tested in automatic testing machine. The tensile and flexural properties of composites are analyzed in the course, wale and diagonal directions. The results show that mechanical properties of composites possess obvious orthotropic characteristics; the differences of fiber volume fraction and yarn orientations result in the different tensile mechanical of composites. Warp-knitted spacer fabric composites revealed good flexural mechanical properties.

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Ma, Pibo, Yuping Chang, and Gaoming Jiang. "Design and fabrication of auxetic warp-knitted structures with a rotational hexagonal loop." Textile Research Journal 86, no. 20 (July 22, 2016): 2151–57. http://dx.doi.org/10.1177/0040517515621132.

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In this paper, the design, manufacturing and characterization of two-dimensional warp-knitted textiles with auxetic performance is reported. Four warp-knitted structures based on a rotational hexagonal structure are produced, and these structures can lead to a negative Poisson’s ratio mathematically. The testing results have confirmed that the knitting structure of the front bar, as well as let-off values of the front bar’s chain parts, has a great effect, and auxetic properties of the warp-knitted textiles have a complicated relationship with the rotation angle. These novel structures can expand the applied area of auxetic structures.

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31

Ertekin, Gözde, and Arzu Marmarali. "The Effect of Heat-Setting Conditions on the Performance Characteristics of Warp Knitted Spacer Fabrics." Journal of Engineered Fibers and Fabrics 11, no. 3 (September 2016): 155892501601100. http://dx.doi.org/10.1177/155892501601100309.

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Spacer fabrics can be produced by using weaving or nonwoven techniques besides warp and weft knitting processes. Warp knitted spacer fabrics are produced by using polyester multifilament and monofilament yarns for surface layers and spacer yarn, respectively. After knitting process, surface layers of these fabrics are in the closed form. Then these fabrics are subjected to a heat-setting treatment in order to increase their structural stability and to achieve an open form with holes. In this study, it is aimed to investigate the effect of heat-setting conditions on the performance characteristics of the warp knitted spacer fabrics. Mass per unit area, thickness, air permeability, compressibility, dimensional stability and compression set properties were measured and evaluated statistically in order to determine the effects of heat-setting conditions such as temperature, duration of heat-setting and stretching (the tension applied to the samples during heat-setting) on the performance characteristics. The results revealed that, heat-setting process has significant effect on all measured performance characteristics of the samples. After heat-setting process, air permeability and compressibility values increases while mass per unit area and compression set values decreases.

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Mokhtari, Fatemeh, Mahnaz Shamshirsaz, Masoud Latifi, and Mohammad Maroufi. "Compressibility Behaviour of Warp Knitted Spacer Fabrics Based on Elastic Curved Bar Theory." Journal of Engineered Fibers and Fabrics 6, no. 4 (December 2011): 155892501100600. http://dx.doi.org/10.1177/155892501100600404.

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Nowadays, the mechanical characterization of 3-D spacer fabrics has attracted the interest of many textile researchers. These Spacer fabrics present special mechanical and physical characteristics compared to conventional textiles due to their wonderful porous 3-D structures. These fabrics, produced by warp knitting method, have extensive application in automobile, locomotive, aerospace, building and other industries. In these applications, the compressibility behaviour plays a significant role in the fabric structural stability. This compressibility behaviour could be affected by different knitting parameters such as density of pile yarn, fabric thickness, texture design etc. The aim of this paper is to introduce and develop an appropriate elastic theoretical model to predict the compressibility behaviour of warp knitted spacer fabric (WKSF). Three theoretical models are proposed, based on modelling pile yarns as the curved bars and are improved in three steps: a) with same curvatures in weft and warp directions (model A), b) curved bar for warp direction and cantilever bar for weft direction (model B), and c) curved bars with two different curvatures in weft and warp directions considering the curvature variations under loading (model C: improved model). The results obtained by the proposed models have been compared with previous model based on simply cantilever bars theory in literature. The results show that the simulation data obtained by the model C are closer to the experimental results comparing to the models A and B. Model C based on different weave parameters could better predict the elastic compressibility behaviour of this kind of WKSF in order to compare with previous models.

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Lin, Jia Horng, Shih Yu Huang, Hui Yu Yang, Ching Wen Lin, Jin Mao Chen, and Ching Wen Lou. "Manufacturing Technique and Property Evaluation of Cotton/Polyester/ Rubber Composite Warp Knit." Advanced Materials Research 627 (December 2012): 302–6. http://dx.doi.org/10.4028/www.scientific.net/amr.627.302.

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Cotton fiber is a type of natural fibers. Using natural fibers to fabricate textile can not only decrease the consumption of synthetic fibers, but also reduce the environmental pollution. This study aims to fabricate elastic knitted fabrics and evaluate their properties. Polyester (PET) filaments and rubber threads serve as the warp while cotton yarn serves as the weft for warp knitting. A crochet machine makes the warp and weft into warp knits with desirable stretchability, during which the amount (single/double) and the ply number (1-, 2-, and 3-ply) of the weft are further varied. The resulting warp knits are evaluated for water absorption, air permeability, and mechanical properties. As demonstrated by the experimental results, the warp knits with single 1-ply weft (S1) yield an optimal air permeability of 224.6 cm3/cm2/s and stiffness along the warp direction of 4.74cm. The warp knits with single 2-ply weft (S2) display an optimal tearing strength of 86N while the warp knits with double 3-ply weft (D3/3) has an optimal tensile strength of 708N.

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Sankaran, Vignaesh, Steffen Rittner, Lars Hahn, and Chokri Cherif. "Development of multiaxial warp knitting technology for production of three-dimensional near net shape shell preforms." Textile Research Journal 87, no. 10 (June 8, 2016): 1226–41. http://dx.doi.org/10.1177/0040517516651102.

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The possibility of direct preforming in the near net shape of final component structure with load- and shape-conforming fiber orientations is highly essential in composite production, not only to reduce costs but also to attain better mechanical properties and form stability. Based on the concept of varying the reinforcement yarn lengths during the feed-in (warp yarn delivery) and segmented doffing, synchronous working numerically controlled warp yarn delivery and doffing machine modules have been newly developed for multiaxial warp knitting machines to create a resource efficient textile process chain by a single-step, large-scale oriented production of load- and form-conforming warp knitted three-dimensional shell preforms with free-form geometrical surfaces. Such customized preforms in the near component net shape offer higher material utilization and increased lightweight potential.

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Zhang, Yang, You Cheng Tong, and Jun Zhou Yao. "Texture Segmentation and Contour Extraction of Warp Knitting Jacquard Fabric Image." Applied Mechanics and Materials 201-202 (October 2012): 1203–6. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.1203.

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To improve the accuracy and efficiency of warp knitting CAD, a new approach to texture segmentation and contour extraction based on wavelet-transform, K-means clustering and Canny operator is proposed in this paper. The procedure is described as follows. Firstly the Daubechies wavelet and pyramid-structure is selected, then the approach decomposes the low frequency part of the fabric image. Secondly starting from the highest scaling level and considering all the four sub-bands, the image is automatic clustered and segmented by K-means clustering. During the process we should calculate the average mean and standard deviation of the three high-frequency coefficients at the current level and transform the higher scaling level label values to have the same mean and standard deviation. Lastly the texture’s contour of image is traced and extracted by Canny operator. The results show that this approach is a feasible way for jacquard fabric.

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NAKAI, ASAMI, AKIO OHTANI, and MASAYUKI KITAMURA. "Textile Fabric for Reinforcements of Composite Materials (1) Warp Knitting Technology." Sen'i Gakkaishi 68, no. 10 (2012): P—286—P—290. http://dx.doi.org/10.2115/fiber.68.p-286.

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Ce, Li, Meng Zhuo, and Sun Yize. "Jacquard Control System of Warp Knitting Machine Based on Embedded System." IOP Conference Series: Materials Science and Engineering 428 (October 1, 2018): 012052. http://dx.doi.org/10.1088/1757-899x/428/1/012052.

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Metzkes, Karoline, Rolf Schmidt, Jan Märtin, Gerald Hoffmann, and Chokri Cherif. "Simulation of the yarn transportation dynamics in a warp knitting machine." Textile Research Journal 83, no. 12 (January 28, 2013): 1251–62. http://dx.doi.org/10.1177/0040517512470197.

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Ma, Xiao Hong, and Zhi Gang Qin. "Tensile Properties on Single-Bar Modified Tricot Fabric Reinforced Composites." Advanced Materials Research 535-537 (June 2012): 223–26. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.223.

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Four kinds of single-bar modified tricot fabrics are knitted on a Raschel latch needle warp knitting machine with glass continuous-filament yarns. The glass warp knitted fabric/ unsaturated polyester resin composites are produced by manual molding technology. The tensile properties of composite samples are tested on the universal material testing machine. The stress-strain curves, elastic modulus, fracture strengths of composites are analyzed in the course, wale and diagonal directions. The results show that the tensile stress/strain curves of single-bar modified tricot warp knitted fabric reinforced composites were nonlinear. The tensile properties of composites possess obvious anisotropic characteristics. The values of elastic modulus and tensile strength were in relation to the yarn numbers bearing tensile load in tensile directions

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Li, Xinxin, Gaoming Jiang, and Pibo Ma. "Computer-Aided Design Method of Warp-Knitted Jacquard Spacer Fabrics." Autex Research Journal 16, no. 2 (June 1, 2016): 51–56. http://dx.doi.org/10.1515/aut-2015-0027.

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Abstract Based on a further study on knitting and jacquard principles, this paper presents a mathematical design model to make computer-aided design of warp-knitted jacquard spacer fabrics more efficient. The mathematical model with matrix method employs three essential elements of chain notation, threading and Jacquard designing. With this model, the processing to design warp-knitted jacquard spacer fabrics with CAD software is also introduced. In this study, the sports shoes which have separated functional areas according to the feet structure and characteristics of movement are analysed. The results show the different patterns on Jacquard spacer fabrics that are seamlessly stitched with jacquard technics. The computer-aided design method of warp-knitted jacquard spacer fabrics is efficient and simple.

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Zheng, Baoping, Gaoming Jiang, Zhijia Dong, and Haisang Liu. "Design of warp knitting electronic shogging system based on mixed-velocity planning curve." Textile Research Journal 91, no. 13-14 (January 21, 2021): 1594–608. http://dx.doi.org/10.1177/0040517520982583.

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To realize high-speed running of a warp knitting machine, the shogging motion should not only meet the requirement of high dynamic response but should also satisfy high positioning accuracy. Due to the large location disturbance and the dynamic response delay in the interpolation method or the single velocity planning curve method, an electronic shogging system for a warp knitting machine based on the mixed-velocity planning curve is proposed in the present study. Through the analysis of the shogging motion combined with the knitted structure, the optimal resolution of the instruction signal is calculated, which is 725 pulses for one needle step, and the velocity loop bandwidth of the servo driver is optimized. In addition, the motor with a load inertia ratio close to 1 is also selected. Analysis of the shogging motion vibration curve confirms that the shogging motion has advantages of high positioning accuracy and high dynamic response under the mixed-velocity planning curve. The response performance with the mixed curve is 12.5% higher than that with the quintic polynomial, and the positioning accuracy of the mixed curve is 26% higher than that with uniform acceleration–deceleration curve.

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Ji, Yong, Gaoming Jiang, Mengting Tang, Ningtao Mao, and He Wang. "Three-dimensional simulation of warp knitted structures based on geometric unit cell of loop yarns." Textile Research Journal 90, no. 23-24 (May 14, 2020): 2639–47. http://dx.doi.org/10.1177/0040517520924005.

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Warp knitted fabrics are typically three-dimensional (3D) structures, and their design is strongly dependent on the structural simulation. Most of existing simulation methods are only capable of two-dimensional (2D) modeling, which lacks perceptual realism and cannot show design defects, making it hard for manufacturers to produce the required fabrics. The few existing methods capable of 3D structural simulation are computationally demanding and therefore can only run on powerful computers, which makes it hard to utilize online platforms (e.g. clouds, mobile devices, etc.) for simulation and design communication. To fill the gap, a novel, lightweight and agile geometric representation of warp knitting loops is proposed to establish a new framework of 3D simulation of complex warp knitted structures. Further, the new representation has great simplicity, flexibility and versatility and is used to build high-level models in representing the 3D structures of warp knitted fabrics with complex topologies. Simulations of a variety of warp knitted fabrics are presented to demonstrate the capacity and generalizability of this newly proposed methodology. It has also been used in virtual design of warp knitted fabrics in wireless mobile devices for digital manufacture and provides a functional reference model based on this simplified unit cell of warp knitted loops to simulate more realistic 3D warp knitted fabrics.

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Huang, Chien-Lin, Yu-Tien Huang, Ting-Ting Li, Chia-Hsuan Chiang, Ching-Wen Lou, and Jia-Horng Lin. "Composite processing and property evaluation of far-infrared/electromagnetic shielding bamboo charcoal/phase change material/stainless steel elastic composite fabrics." Journal of Polymer Engineering 36, no. 2 (March 1, 2016): 211–20. http://dx.doi.org/10.1515/polyeng-2015-0080.

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Abstract This study aims to fabricate far-infrared (FIR)/electromagnetic shielding composite fabric and its composite yarn. Five types of composite yarns with different sheath components were made by using bamboo charcoal (BC) fibers, phase change material (PCM) roving and stainless steel (SS) fibers via a ring spinning frame, and then fabricated into five elastic warp-knitted fabrics with different weft yarns using a crochet knitting machine. The mechanical properties of different constituents of composite yarns and their fabrics, as well as FIR emissivity and electromagnetic shielding effectiveness (EMSE) of resulting fabrics were evaluated. The results show that BC/SS composite yarns and their fabricated warp-knitted fabrics display the highest tensile strength. Warp-knitted fabrics containing BC fibers possess the highest FIR emissivity. EMSE of the fabricated warp-knitted fabrics improves proportionally with the number of the lamination layers. The resulting multifunctional elastic knitted fabrics apply as athletic clothing, underwear, socks, protective or healthcare products in the future.

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Öğr. Üyesi Başak ÖZKENDİRCİ, Dr. "TEKSTİL TASARIM ALANI OLARAK ÇÖZGÜLÜ ÖRME/Warp Knitting As Textile Design Area." International Journal of Interdisciplinary and Intercultural Art 7, no. 7 (2019): 17–30. http://dx.doi.org/10.29228/ijiia.7.71.

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HASSEN, MOHAMED BEN, MOHAMED TAHER HALIM, EMAD ABUALSAUOD, and ASEM OTHMAN. "Quality yarn index using AHP and Fuzzy method." Industria Textila 71, no. 05 (October 28, 2020): 487–91. http://dx.doi.org/10.35530/it.071.05.1699.

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The yarn quality depends on many parameters: characteristics parameters, mechanical and physical properties. Making the hypothesis that the quality of the yarn is a multicriteria problem, in this paper, we propose a new method to determine the Quality Yarn Index QYI based on Analytic Hierarchy Process AHP and Fuzzy theory. A questionnaire was designed for experts of each field (weaving and knitting) to evaluate the relative importance for each property to determine coefficients of the AHP matrix. Results revealed that matrix coefficients changed with yarn application (weft or warp weaving and knitting) The QYI can be used in any application, where a rapid decision is needed, to evaluate the global quality of yarn and to make a comparison between different yarn qualities

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Liu, Haisang, Gaoming Jiang, and Zhijia Dong. "A shortened development process method for warp-knitted yarn-dyed shirt fabric." Textile Research Journal 91, no. 3-4 (July 26, 2020): 443–55. http://dx.doi.org/10.1177/0040517520937372.

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At present, warp-knitted yarn-dyed shirt fabric has become the research focus due to its comfort and highly efficient production. In order to shorten the development process of warp-knitted yarn-dyed shirt fabric, a computing method including theoretical modeling and simulation is proposed in this paper to simulate 2–5 guide bar warp-knitted yarn-dyed shirt fabric. Based on the structure model of warp-knitted fabric, a new model of geometric shape, including loops and underlap, is built according to size measurement results of the loops. In terms of the establishment of mathematical models, such as models of yarn-pressing, loop types, loop locations, guide bar threading, color and fineness, the transformation between knitting technology and mathematical language is realized. With the double buffer technique of HTML (Hypertext Markup Language), loops and underlaps of each bar are displayed separately on different canvases superposed in some order. Simulation is implemented for 2–5 bar warp-knitted yarn-dyed shirt fabric via JavaScript and C# programming languages. The results indicate that this method is able to simulate diverse 2–5 bar warp-knitted yarn-dyed shirt fabrics in a short time. The pattern effect can be seen with a high similarity and practicability before it is produced, thereby shortening the development.

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Pan, Yi-Jun, Chien-Teng Hsieh, Chien-Lin Huang, Chen-Hung Huang, Ching-Wen Lou, Che-Wei Li, and Jia-Horng Lin. "Sound absorbent, flame retardant warp knitting spacer fabrics: Manufacturing techniques and characterization evaluations." Fibers and Polymers 16, no. 12 (December 2015): 2682–88. http://dx.doi.org/10.1007/s12221-015-5576-3.

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Kurbak, Arif. "Models for basic warp knitted fabrics Part I: Chain stitches and their applications on marquisette and weft-inserted warp-knitted fabrics." Textile Research Journal 89, no. 10 (June 18, 2018): 1863–85. http://dx.doi.org/10.1177/0040517518779992.

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Chain stitches are basics structures to obtain a group of net grounds in warp knitting such as marquisette, curtain-net ground and full-width weft-inserted fabrics. These net grounds are, in turn, used as technical fabrics as well as household goods. Modeling of warp-knitted fabrics started with some basic geometrical models and it was continued using non-uniform basis-spline (NURBS) curves and surfaces. There were discontinuities in the loop parts in the early models and the NURBS models needed some control points from some sources. In this work instead of using NURBS curves, an attempt is made to model warp-knitted fabrics using known curves and continuities in loop parts are attained as much as possible. First of all, open chain stitch is modeled. Closed chain stitch is obtained by changing some parts of open chain stitch model. Models then applied to marquisette, curtain-net ground and full-width weft-inserted warp-knitted fabrics are presented. Models created are drawn to scale by using 3DS-Max computer graphical program. It is seen that the shapes obtained by the models are similar to those which can be observed on real samples.

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Lv, W. G., J. Bai, and Ce Zhang. "Design of Carpet-Knitting Machine Control System Based on Embedded System." Applied Mechanics and Materials 743 (March 2015): 239–43. http://dx.doi.org/10.4028/www.scientific.net/amm.743.239.

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Electronic jacquard machine is the main knitting equipment now, and its control system is the device’s core component that can influence working performance. This paper introduces design and implementation of the Electronic Jacquard Control System for the warp woof knitting machine, and it is a high performance and scalable control system. The hardware of control system is designed with modular hierarchical method. The system contains hardware buffer and ensure reliable operation in real time, can continue weaving after outages, while, with sufficient flexibility and maintainability, can be adapted to different needs of different grades of carpet jacquard equipment. Control system supports a variety of pattern data input, providing flower pattern compilation features real-time visualization of dynamic control of the weaving process to improve the efficiency of the weaving machine. Control system based on general hardware and software platform: ARM9 and Embedded Linux operating system.

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Zheng, Wei, Jin Liang Zhou, and Jin Min Peng. "The Control on Data Transmission of Multi-Bar Warp Knitted Machine." Advanced Materials Research 332-334 (September 2011): 256–59. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.256.

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Mechanism controlling longitudinal movements of guide bars in a warp knitting machine is still employed in many factories in China. But it is use a lot of time in order to change the type of fabrics. This sort of mechanism is gradually replaced by stepping motor that controlled by microcomputer. So, it is need to send data that guide bar need to move from computer to microcomputer. A circuit of transmission data is designed. The serial communication uses port of RS232C and potential convertor MAX232ACPE without model. There are use only three lines of RXD, TXD and GND of the serial communication port in the microcomputer (80C51). The protocol of transmission data is programmed. The serial communication baud rate at 2400 is set. The data that control movement of guide bars can be transmitted rightly.

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Journal articles on the topic 'Warp knitting'

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