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Journal articles on the topic 'Warp knitting machine'

Author: Grafiati
Published: 28 May 2022

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

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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12

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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13

Liang, Xinhua, Xuliang Yu, Zhijia Dong, and Honglian Cong. "Preparation and moisture management performance of double guide bar warp-knitted fabric based on special covering structure." Journal of Engineered Fibers and Fabrics 16 (January 2021): 155892502110469. http://dx.doi.org/10.1177/15589250211046951.

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This article provides a knitting method for warp-knitted fabrics with good moisture management performance. By adjusting of the warp knitting machine (mainly the bar), the design of lay-up method of the yarn, the selection of the yarn, and the warp let-off tension, the yarn covering relationship has been adjusted. By using two kinds of fineness polyester DTY, cotton yarn and spandex, designing two kinds of warp-knitting structures, six different warp-knitted fabrics have been knitted. The moisture management performance of these knitted samples was compared and evaluated. The study found that the greater the difference between the inner yarn and the outer yarn, the better the moisture management ability of the fabric. Polyester DTY with 50D/14F on the inner side and polyester DTY with 75D/288F on the outer side have the best moisture management performance. The polyester DTY with 50D/14F on the inside and 9.83Tex cotton yarn on the outside have higher wetting time and absorption rate.
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14

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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15

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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16

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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17

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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18

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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19

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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20

Wen, Xia, Sencai Lai, and Wen Ren. "Design of an Adaptive Scheduling Algorithm for a Warp Knitting Machine Industrial Wireless Network Based on Fuzzy Control." Fibres and Textiles in Eastern Europe 29, no. 2(146) (April 30, 2021): 75–80. http://dx.doi.org/10.5604/01.3001.0014.6085.

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Aiming at resolving the technical bottlenecks existing in current warp knitting machine control systems, such as the distributed industrial wireless networked control system, in this study the architecture of a warp knitting machine industrial wireless networked control system based on the WIA-PA international standard is proposed which provides a design idea for building a „smart factory”. Secondly, according to the WIA-PA specification, an allocation plan of time slots in a super-frame for intra-cluster and inter-cluster communication is given. Third, in order to enhance the real-time access of equipment, expand the network capacity, and reduce the energy consumption of the system, based on the carrier sense multiple access (CSMA) mechanism supported by IEEE STD 802.1 5.4:2006, an adjustment algorithm of the super-frame structure based on fuzzy control was designed. The effectiveness of the design method was verified by simulation.
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21

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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22

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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23

Yuping, Chang, Yanping Liu, Zhao Shuaiquan, and Hu Hong. "Design and manufacture of three-dimensional auxetic warp-knitted spacer fabrics based on re-entrant and rotating geometries." Textile Research Journal 92, no. 3-4 (August 11, 2021): 467–78. http://dx.doi.org/10.1177/00405175211037204.

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Warp knitting technology is a fabric-forming technologies that is very suitable to fabricate three-dimensional (3D) auxetic fabrics due to its high efficiency and powerful pattern designing possibilities. In this study, two typical auxetic geometries, namely the re-entrant hexagonal network and rotating square solids, were selected as the design prototypes for the design and manufacture of 3D warp-knitted spacer fabrics. While two 3D warp-knitted spacer fabric structures with representative units of different sizes designed based on the re-entrant hexagonal geometry were manufactured by using a RD7 double needle bar Raschel machine with seven yarn guide bars, two 3D jacquard warp-knitted spacer fabrics with different base fabric structures designed based on the rotating squares geometry were fabricated by using a RDPJ4/2 double needle bar jacquard machine with two ground yarn guide bars and four jacquard guide bars. The Poisson’s ratios of these 3D warp-knitted fabrics in the course direction and wale direction were evaluated respectively through constant-rate tensile tests. The results revealed that the re-entrant hexagonal fabric structure with double chain stitches has auxetic behavior across a wide range of tensile strains along the course direction, while the rotating square fabric structure with elastic chain stitches as the base is auxetic within a narrow range of tensile strains along the wale direction. The study provides an alternative method to directly produce auxetic warp-knitted spacer fabrics through a single knitting process instead of using an additional post-compression and heat-setting process.
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24

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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25

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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26

Michalak, Andrzej, and Zbigniew Mikołajczyk. "Functional Model of a Warp-Knitted Machine for Producing 3D Technical Knitted Fabrics." Fibres and Textiles in Eastern Europe 28, no. 5(143) (October 31, 2020): 97–105. http://dx.doi.org/10.5604/01.3001.0014.2393.

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The article describes the construction and testing of a functional model of an innovative warp – knitting machine for technical spatial knitted fabrics with an original structure. Design assumptions regarding the geometrical, kinematic and driving characteristics of the machine are described. The functional model as well as its physical implementation as a research stand are presented. The production phases of the 3D knitted fabric are also demonstrated. The research results are described and their importance for the construction of a machine prototype of the production version are emphasised.
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27

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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28

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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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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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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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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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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Rittner, Steffen, Kerstin Speck, André Seidel, Mateusz Ewertowski, Manfred Curbach, and Chokri Cherif. "Development of Loop-Shaped Textile Anchoring Reinforcements Based on Multiaxial Warp Knitting Technology." Fibres and Textiles in Eastern Europe 28, no. 6(144) (December 31, 2020): 64–71. http://dx.doi.org/10.5604/01.3001.0014.3800.

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Due to the General Building Approval granted for the strengthening of steel reinforced concrete structures by means of textile reinforced concrete, the foundation for its introduction into practice was successfully established. It approves textile reinforcements in the form of non-crimp fabrics made of carbon fibre heavy tows with high yarn fineness. Thus, it is aimed at increasing the amount of filaments per roving in order to minimise the number of reinforcing layers required. However, the relation between the surface and cross-sectional area is compromised once fineness is increased, leading to an unfavourable enlargement of anchoring and overlapping lengths. Therefore, a recently concluded research project evaluated if this challenge can be overcome by means of a loop-shaped selvedge. This paper presents the results generated within these investigations, proving the potential of the textile-based solution. Moreover, required machine modifications based on multiaxial warp knitting technology for the integral and continuous manufacturing of anchoring textile reinforcements as well as significant results derived from bonding tests will be introduced.
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CHEN, SI, and DA-WEI SHI. "Low-velocity impact response of 3D polyurethane resin composites reinforced with spacer fabrics." Industria Textila 70, no. 02 (2019): 111–15. http://dx.doi.org/10.35530/it.070.02.1577.

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This research aimed to investigate the low-velocity response of polyurethane-based composites. Three warp-knitted spacer fabrics produced on a double-needle bar warp knitting machine by vary different surface structures were used as the reinforcement element. Two Micro-balloons were added into the composites as well. A new type of resin named polyurethane resin was involved for fabricating the composites. Accordingly, the impact behaviors of composites were evaluated properly under the impact velocity of 1 m/s and 2 m/s, respectively. The findings obtained illustrate that the composites possess excellent low-velocity impact properties and the impact resistance capacities are significantly affected by the fabric surface structures and the types of Micro-balloon, indicating that their impact energy absorbability can be tailored to meet the specific end-use requirements by varying the structural parameters.
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35

Ren, Wen, and Sencai Lai. "Embedded Electronic Jacquard Guide Bar: A New Approach to Warp Knitting Using the Machine Jacquard Control System." Fibres and Textiles in Eastern Europe 26, no. 6(132) (December 31, 2018): 95–101. http://dx.doi.org/10.5604/01.3001.0012.5172.

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A fluorine-containing acrylate copolymer emulsion was prepared in this study, which was The jacquard control system is one of the crucial parts of a warp knitting machine. In this paper, we present a new jacquard control scheme called the embedded electronic jacquard guide bar (EEJGB). In this scheme, the Micro-Controller Unit (MCU), jacquard driver circuit, DC powers, and communication interfaces are integrated to achieve a simple structure, high reliability as well as ease of installation and maintenance. Specifically an innovative communication strategy with the advantages of fault tolerance and automatic addressing based on the Modbus serial bus is formulated. This paper describes the design of the hardware structure, communication methods of EEJGB, and printed circuit board (PCB), provided to demonstrate the feasibility of the method proposed.
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36

Yan, Zhonghua. "MODELING AND KINEMATICS SIMULATION OF PLANE TEN-BAR MECHANISM OF WARP KNITTING MACHINE BASED ON SIMCAPE/MULTIBODY." Acta Mechanica Malaysia 2, no. 2 (January 1, 2018): 15–18. http://dx.doi.org/10.26480/amm.02.2018.15.18.

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Zhang, Aijun, Xinxin Li, Pibo Ma, Ying Xiong, and Gaoming Jiang. "3D simulation model of warp-knitted patterned velvet fabric." International Journal of Clothing Science and Technology 28, no. 6 (November 7, 2016): 794–804. http://dx.doi.org/10.1108/ijcst-01-2016-0006.

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Purpose Realistic geometric description is essential for simulating physical properties of warp-knitted velvet fabrics, which are widely used for home-textiles and garments. The purpose of this paper is to provide an approach to the description of patterned piles and propose a customized simulation model to realize highly real-time simulation of warp-knitted velvet fabrics in three dimensions. Design/methodology/approach Based on knitting technology and structure features, a mathematical model to qualify forming possibility of piles is conducted by assessing underlaps of pattern bars and pile ground bars. When the pile areas and ground areas are classified, a three-dimensional (3D) space coordinate is built, of which the z-axis is divided into equal spaces to form certain multi-layer textured slices. Color and transparency of piles on each textured slice can be computed and generated by mapping to 3D geometrical grid layers with particular mapping relationship. Moreover, piles’ deflection and spatial collision are also taken into account to make sure high uniformity with real fabrics. Findings According to the models built, a simulator special for warp-knitted patterned velvet fabrics is programed via Visual C++ and the models are proven practical and easily implemented by comparing simulated effect of one sample with real fabric. Research limitations/implications Because of present limited research, 3D simulation of patterned velvet fabrics knitted on double-needle bar Raschel machine as well as 3D shadow effect will be studied in the further research. Practical implications The paper includes implications for designing patterned velvet products and shows convenience to instantly see finished effect without sampling on machine. Originality/value This paper fulfills a featured simulation method for warp-knitted patterned velvet fabrics in 3D dimensions for the first time.
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38

Xu, Wanli, Pibo Ma, Gaoming Jiang, and Ailan Wan. "Mechanical Properties of Polypropylene Warp-Knitted Hernia Repair Mesh with Different Pull Densities." Polymers 10, no. 12 (November 29, 2018): 1322. http://dx.doi.org/10.3390/polym10121322.

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The medical polypropylene monofilament with a diameter of 0.10 mm was used as the material. Four different pull densities and two different warp run-ins were set up on the electronic traverse high-speed Tricot warp knitting machine, with the gauge of E28. The raw material was used to knit four variations of single bar plain knitted fabrics with 1 in-1 miss setting. Each variation required eight samples. The mechanical properties of the above 32 warp-knitted fabric samples are tested, including their tensile stress (in both vertical and horizontal directions), tearing stress (in both vertical and horizontal directions) and bursting stress. The results obtained shows that the relationship between the vertical, the horizontal stress, and the pull density are not monotonic. The tensile stress in the vertical direction firstly decreases and then increases with an increase of the pull density; however, the tensile stress in the horizontal direction firstly increases and then slightly decreases with an increase of the pull density; again the vertical tensile stress of all fabrics was always higher than the horizontal tensile stress. The bursting stress has a positive linear relation to the pull density. The vertical tearing stresses of four samples were greater than the horizontal tearing stress.
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Chen, Qing, Lin Shu, Bailu Fu, Rong Zheng, and Jintu Fan. "Electrical Resistance of Stainless Steel/Polyester Blended Knitted Fabrics for Application to Measure Sweat Quantity." Polymers 13, no. 7 (March 25, 2021): 1015. http://dx.doi.org/10.3390/polym13071015.

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Skin wetness and body water loss are important indexes to reflect the heat strain of the human body. According to ISO 7933 2004, the skin wetness and sweat rate are calculated by the evaporative heat flow and the maximum evaporative heat flow in the skin surface, etc. This work proposes the soft textile-based sensor, which was knitted by stainless steel/polyester blended yarn on the flat knitting machine. It investigated the relationship between electrical resistance in the weft/warp directions and different water absorption ratio (0–70%), different sample size (2 cm × 2 cm, 2 cm × 4 cm, 2 cm × 6 cm and 2 cm × 8 cm). The hydrophilic treatment effectively improved the water absorption ratio increasing from 40% to 70%. The weft and warp direction exhibited different electrical behaviors when under dry and wet conditions. It suggested the weft direction of knitted fabrics was recommended for detecting the electrical resistance due to its stable sensitivity and linearity performance. It could be used as a flexible sensor integrated into a garment for measuring the skin wetness and sweat rate in the future instead of traditional measurements.
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40

Mermelstein, Sylvia P., and Memis Acar. "Modelling the pattern creation process for the optimum design of a circular warp-knitting machine using a conical needle-bed." Journal of the Textile Institute 98, no. 5 (September 28, 2007): 397–408. http://dx.doi.org/10.1080/00405000701464050.

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41

Ren, Wen, Xia Wen, and Sencai Lai. "Design of an Adaptive Boost Energy-Saving Fuzzy Control System Driven by the Finite State Machine." Mathematical Problems in Engineering 2021 (May 7, 2021): 1–12. http://dx.doi.org/10.1155/2021/9924836.

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Aiming at the challenging problem of the traditional warp knitting machine electronic jacquard control system with complex structure of multiple circuit boards layered cascade, such as large physical space occupation, high power consumption, and independent high-voltage power supply voltage, we proposed an embedded circuit and control strategy design for the piezoelectric jacquard needle (PJN) with adaptive boost and energy recovery functions. Firstly, the electromechanical dynamics model of PJN was established. Secondly, the fuzzy PI double closed-loop control algorithm driven by a finite state machine is proposed. Thirdly, with the help of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), the PJN is integrated with the drive circuit. The drive circuit of PJN uses an energy storage inductor to replace the current limiting resistor of the traditional drive circuit, which can not only limit the forward charging current of the PJN and reduce energy loss but also can use the energy absorbed from the low-voltage power supply to adaptively boost the power supply of the PJN to the high voltage required for working conditions. The simulation results show that the new PJN drive circuit has an adaptive self-boost function. The PWM signal modulated by the fuzzy PI double closed-loop control algorithm can efficiently and accurately control the adaptive boost power supply and the voltage across the PJN. The mode of the circuit can be correctly switched through the sequential logic of the finite state machine and realize the energy recovery function.
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42

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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43

Cong, Honglian, Xinxin Li, Aijun Zhang, Yanting Zhang, and Jun Zhong. "Modeling of double-layer jacquard fabrics for pattern simulation." International Journal of Clothing Science and Technology 30, no. 5 (September 3, 2018): 698–709. http://dx.doi.org/10.1108/ijcst-08-2017-0131.

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Purpose Double-jacquard technique is referred as the most advanced technology for forming patterns on both layers of a 3D fabric knitted on a double-needle bar warp-knitting machine. In order to realize the computer-aided design and simulation of jacquard patterns, the purpose of this paper is to propose a mathematic model for representation of jacquard structures and an improved mass-spring model to improve the simulation of structural deformation behavior. Design/methodology/approach Primarily, it analyzes the jacquard patterning method and displacing principle to design jacquard structures on each layer and linking structures of two layers. Based on that, a loop geometry defined by six key points and segmental lines is built to transfer the jacquard bitmap and lapping movements into a fabric of loops and therefore realizing patterns visualization. Afterwards, an improved mass-spring model is built to simulate structural deformation, in which the fabric is simplified as a mesh of uniformly distributed mass particles. Each loop is treated as a massless particle while underlaps are referred as structural springs connecting loops particles. Elastic forces of these springs on each loop particle is calculated according to the Hook’s law and Newton’s second law, and then based on the explicit Euler’s equations, motion state of each particle is solved including the velocity and the shift. Findings Based on the above method, a simulator for double-layer jacquard fabrics is developed via Visual C++ language to visualize the patterned fabrics with pitting effects. With a jacquard shoe fabric as an example, this simulation model is proved to be practical and efficient by comparing the simulation result and real fabric. Research limitations/implications Because of limited researches, 3D simulation modeling of this double-layer jacquard fabric will be studied in the further research. Practical implications The implement of this simulation method will offer the industries a time-saving and cost-saving approach for new fabrics development. Originality/value This approach can be used as a reference for simulating other knitted fabrics with jacquard patterns, such as jacquard garment fabrics and home textile fabrics.
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44

Ren, Wen, Xia Wen, and Sencai Lai. "Digital Real-Time Rotating Speed Measuring and Fuzzy PID Control Algorithm Design for the Multi-Speed Electronic Let-Off System." Fibres and Textiles in Eastern Europe 29, no. 4(148) (August 31, 2021): 48–55. http://dx.doi.org/10.5604/01.3001.0014.8231.

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Aiming at the warp knit fabric horizontal strip problem faced by the multi-speed electronic let-off process of warp knitting machines, a design scheme of a fully digital intelligent multi-speed electronic system is proposed. A wide-range digital speed measurement method is proposed which solves the problem that the traditional analog circuit speed measurement method cannot measure the real-time warp beam speed, and also eliminates the problem of the low-speed feedback blind zone. According to the characteristics of the electronic let-off system of warp knitting machines, the hardware structure and software algorithm of the fuzzy PI control system were designed which can adjust the control parameters of the traditional PI controller in real time according to the fuzzy control table, and realise stable multi-speed electronic let-off. The effectiveness of the design method was verified by simulation.
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45

Єліна, T. В., Т. А. Дзикович, Л. Є. Галавська, and Т. М. Дмитренко. "РОЗРОБКА ЖІНОЧИХ ПАНЧІХ З ЖАКАРДОВИМ ВІЗЕРУНКОМ." Fashion Industry, no. 4 (February 23, 2021): 26–31. http://dx.doi.org/10.30857/2706-5898.2020.4.1.

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Development of a model of warm and stylish women's stockings with a jacquard pattern, suitable for mass production. Methodology. To achieve this goal, a review of patent and technical іnformation on the manufacture of hosiery with jacquard patterns was realized. Autodesk AutoCAD software is used to increase the effi ciency of product design. Findings. The study developed a collection of women's stockings with animal ornaments and patterns for making the same. A pattern simulating the color of a zebra's fur was chosen for experimental production.A two-color double bed jacquard stockings collection is designed. The production of this knit does not involve the knitting density changes. Correspondence of the stocking surface geometry to the measurements of a person’s leg can be provided by increasing or decreasing working needles. The latter cannot be realized on specialized circular knitting equipment for hosiery production. The models of the collection can be made on fl at knitting machines accord ing to the patterns. An experimental model is made of half-woolen yarn on a semi-industrial fl at knitting machine Brother KH-965i. The linker Hague D280E has been used for the stocking’s parts sewing. A parametric pattern of the unfolded product in Autodesk AutoCAD has been created. To adjust the pattern to the desired size, a customer has to enter the measurements and the boundary will be redrawn automatically. An application in the Autolisp programming language has been developed to automatically calculate the knitting program (increase and decrease the number of working needles). Entering course and wale spacing values of the sample structure in the program allows the automatically calculating the required number of working needles in each part of the product.Practical value. The technology of making women’s hosiery with design patterns on the basis of double jacquard knits on fl at-bed knitting machines has been develope d. Such products can be made both on modern fl at knitting machines with computer control, such as, for example, automated equipment of the Stoll or Shima Seiki brands and on semi-industrial knitting machines, such as Brother, Selver Red and others.
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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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47

MUHAMMET, AKAYDIN. "Comparison of the physical properties of woven and warp knitted bathrobe towel fabrics produced with similar properties." Industria Textila 73, no. 02 (April 30, 2022): 137–44. http://dx.doi.org/10.35530//it.073.02.202053.

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In recent years, the use of towel fabrics produced by warp knitting machines in the production of bathrobe fabrics has gradually increased. These fabrics, which can be produced more massively at a lower cost, also show a more flexible character than woven towel fabrics. When working with two pile yarn groups whose raw materials or properties are different from each other, the creation of fabric structures with a completely different face and back is seen among the reasons for choosing these fabrics. In this study, after determining the basic performance characteristics such as weight, tensile strength, tear strength, bursting resistance, shrinkage, and water absorbency of the bathrobe towel fabrics produced with the weaving and warp knitting technique, which has undergone the same finishing processes, their performance and strength properties were compared with each other and the results were evaluated using statistical analysis methods. It has been determined that while woven towel fabrics give higher strength values, warp-knitted towel fabrics show higher stretch. The degree of hydrophilicity degree is increased significantly after sequential finishing processes in both towel fabrics. As a result of the finishing processes, there was a general decrease in the tear strength of the woven bathrobe terry fabric, while there was no systematic decrease in the other strength parameters and the strength properties of the warp-knitted towel fabric. In consequence of the finishing processes in both towel fabric structures, a significant reduction in size was observed in the warp direction.
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48

Dawit, Hewan, Qian Zhang, Yimeng Li, Syed Rashedul Islam, Jifu Mao, and Lu Wang. "Design of Electro-Thermal Glove with Sensor Function for Raynaud’s Phenomenon Patients." Materials 14, no. 2 (January 14, 2021): 377. http://dx.doi.org/10.3390/ma14020377.

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Raynaud’s phenomenon (RP) is a disease that mainly affects human fingertips during cold weather. It is difficult to treat this disease using medicine, apart from keeping the body in a warm environment. In this research, conductive knitted fabrics were fabricated to help relax the vessels of the patient’s fingertips by providing proper heat, and also serving as a sensor to detect finger motion after relaxation of the blood vessels of patients. Four different structures, termed plain, purl, interlock, and rib were produced using conductive silver/PE (polyethylene) yarn and wool yarn, with a computerized flat knitting machine. The effect of knitted structure on the electro-thermal behavior, sensitivity, and stability of resistance change (∆R/R) under different tensile forces was investigated. By comprehensive comparison, the purl structure was identified as the preferred structure for the heating glove for RP patients, owing to superior electro-thermal behavior. Additionally, the purl structure had a greater capacity to detect different motions with stable resistance change. This potential electro-thermal glove could be used for functional, as well as aesthetic (fashion) purposes, and could be worn at any time and occasion with complete comfort.
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Beer, Mathias, Yves-Simon Gloy, Mohit Raina, and Thomas Gries. "Construction of a Carbon Fiber Reinforced Weft Guide Bar for a Crochet Knitting Machine." Journal of Mechanical Design 136, no. 6 (April 11, 2014). http://dx.doi.org/10.1115/1.4026822.

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The crochet knitting machine is a warp knitting machine with a weft insertion system placed on a weft guide bar. On standard machines, the weft guide bar is made from aluminum and weighs about 570 g. The single-drive motors, which power the bar, account for 15–20% of the machines total power consumption. The aim of this research was to reduce power consumption by decreasing the mass of the weft guide bar. This was done by constructing the bar from carbon fiber reinforced plastics rather than aluminum, resulting in a mass saving of 260 g.
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50

Seyam, Abdelfattah M. "Formation of Textile Structures for Giant-Area Applications." MRS Proceedings 736 (2002). http://dx.doi.org/10.1557/proc-736-d1.3.

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ABSTRACTRecently, textile machine manufacturers introduced to the market significant technological advances. Examples of such advances are higher speeds, higher level of automation, new concept of jacquard weaving that enables control of individual warp threads, CAD systems, and wider machines than seen before. This paper reviews the new development of formation systems of textile structures with emphasis on technologies that enables the production of giant-area fabrics. The review includes broad range of technologies (weaving, knitting, needlepunching, hydroentanglement, meltblowing, etc.). Additionally, the paper sheds the light on the potential of the textile technologies to manufacture electrotextile fabric structures.
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