Relevant bibliographies by topics / Hollow yarns

Academic literature on the topic 'Hollow yarns'

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

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Journal articles on the topic "Hollow yarns"

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Mukhopadhyay, Arunangshu, Saiyed Muzffar Ishtiaque, and Devanand Uttam. "Impact of Structural Variations on Pre-Hollow/Micro-Porous Yarn's Tensile and Physical Properties." Journal of Engineered Fibers and Fabrics 7, no. 1 (March 2012): 155892501200700. http://dx.doi.org/10.1177/155892501200700107.

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In the present study impact of structural variations on pre-hollow/micro-porous yarn's tensile and physical properties were investigated in view of their processing and ultimate product quality. The results show that: the core pre-hollow yarns and doubled pre-hollow yarns possessing continuous polyvinyl alcohol (PVA) filaments are better in tensile behavior than blended pre-hollow yarns which contain discrete PVA staple fibers. The doubled pre-hollow yarns were found to have the lowest unevenness, thick places, thin places and total imperfections followed by blended pre-hollow and core pre-hollow yarns, while blended pre-hollow yarns showed lowest number of neps. The core pre-hollow yarns exhibit lowest hairiness followed by blended pre-hollow yarns and doubled pre-hollow yarns. Use of double roving during spinning is beneficial for improving yarn strength, unevenness imperfections and hairiness in all the pre-hollow yarns.
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Chen, Weiwang, Ming Fu, and Wenguo Weng. "Electrospinning of continuous nanofiber hollow yarns for thermal storage and insulation by a multi-step twisting method." Textile Research Journal 90, no. 9-10 (November 5, 2019): 1045–56. http://dx.doi.org/10.1177/0040517519886023.

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In this study, phase change nanofiber hollow yarns were designed. The hollow yarn structure is proposed due to its ability to provide insulation for fabrics, while the phase change material is added due to its capacity to store thermal energy. These yarns are developed by utilizing the classical covering–dissolving strategy, which uses a modified multi-step twisting method. The effects of twisting and winding speed on the yarn morphology, structure, mechanical and heat storage properties are discussed. It is observed that the ultrafine fibers for yarn fabrication are about 100–400 nm in diameter. Their yarn products then undergo obvious shape deformation in the process of hollowing, resulting in a nanofiber hollow yarn with yarn diameter of around 250 µm. To obtain target yarns with desirable structure and strength, the recommended twisting and winding speed should be within 200–260 rpm and 1.2–1.6 rpm, respectively. Their tensile strength and elongation at break under these conditions are tested to be about 30–40 MPa and 20%, respectively, which is acceptable for further weaving. As for the heat storage capacity, it is somewhat weakened but still considerable (20–30 kJ·kg–1) within the temperature range of 30–40℃. By coupling air and phase change materials together, the resultant nanofiber hollow yarns and their fabric products proved to have better heat storage and insulation performance, and may have broad prospects for thermal regulation.
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Oğlakcioğlu, Nida, Ahmet Çay, Arzu Marmarali, and Emel Mert. "Characteristics of Knitted Structures Produced by Engineered Polyester Yarns and Their Blends in Terms of Thermal Comfort." Journal of Engineered Fibers and Fabrics 10, no. 1 (March 2015): 155892501501000. http://dx.doi.org/10.1177/155892501501000104.

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Engineered yarns are used to provide better clothing comfort for summer garments because of their high levels of moisture and water vapor management. The aim of this study was to investigate the characteristics of knitted structures that were produced using different types of polyester yarns in order to achieve better thermal comfort properties for summer clothing. However they are relatively expensive. Therefore, in this study engineered polyester yarns were combined with cotton and lyocell yarns by plying. This way, the pronounced characteristics of these yarns were added to the knitted structure as well. Channeled polyester, hollow polyester, channeled/hollow blended polyester, cotton, and lyocell yarns were plied with each other and themselves. Then, single jersey structures were knitted using these ply yarn combinations and air permeability, thermal resistance, thermal absorptivity, water vapor permeability, moisture management, and drying properties were tested. The results indicate that channeled PES fabrics are advantageous for hot climates and high physical activities with regards to high permeability and moisture transfer and also to fast drying properties. Besides, air permeability and thermal properties improved through the combination of lyocell yarn with engineered polyester yarns. However, the use of lyocell or cotton with engineered yarns resulted in a to a decrease in moisture management properties and an increase in drying times
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Yongfu, Xu, Yi Zhang, and Gao Yuan yuan. "Preparation and fuzzy evaluation of wool hollow yarn." Textile Research Journal 90, no. 9-10 (October 23, 2019): 1149–56. http://dx.doi.org/10.1177/0040517519884586.

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Wool hollow yarn not only has the characteristics of being skin-friendly and warm, it also has good air and moisture permeability; thus, it has great development potential. Here, we first show that the water-soluble (polyvinyl alcohol (PVA)) fiber ratio in core-spun yarn should not exceed 30%; to ensure smooth spinning, a core yarn linear density of 3.4–5.6 tex was selected by theoretical analysis. Second, using rabbit hair fiber with tencel fiber, which has high tenacity, as an environmentally friendly blended outsourcing fiber, and water-soluble (PVA) fiber for the core yarn, we prepared five types of core-spun yarns. Water-soluble (PVA) fiber was removed in 20 min to prepare wool hollow yarn using room temperature water. Finally, properties of the wool hollow yarn produced, such as breaking strength, breaking elongation, evenness of CV (coefficient of variation) value, >3 mm hairiness index, and deviation from linear density after removing PVA, were tested and analyzed, and evaluated comprehensively by means of fuzzy mathematics. The results showed that the hairiness of wool hollow yarn was improved, the mechanical properties and evenness of sliver and hairiness were decreased, and the overall properties of hollow yarns with a core yarn content of 25% were the best.
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Chen, Junli, and Zhaoqun Du. "Structural design and performance characterization of stable helical auxetic yarns based on the hollow-spindle covering system." Textile Research Journal 90, no. 3-4 (July 17, 2019): 271–81. http://dx.doi.org/10.1177/0040517519862881.

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Helical auxetic yarns (HAYs) spun by ring spinning have a large residual torque, which restricts their application. To address this problem, the hollow-spindle covering system was adopted to prepare structurally stable HAYs consisting of the core yarn and the wrap yarn. Four types of HAYs were manufactured, and a self-designed automatic stretching device was prepared for recording the alteration of yarn diameter. These as-fabricated yarns were measured and characterized in terms of their deformation behavior and auxetic performance. The strain–stress curves of these HAYs have two peaks corresponding to their respective two component yarns during stretch until completely failure, and also it was found that the wrap component is always broken before the core yarn. By comparison, the maximum negative Poisson's ratio (NPR) of −2.55 was achieved with as-prepared HAYs composed of spandex and stainless steel monofilaments. Meanwhile, the structural stability of these yarns was discussed with respect to the residual torque, and the experimental results indicate that the residual torque of these HAYs is obviously smaller than that of conventional ring-spun yarns. These confirm the superiority of our proposed hollow-spindle method. Furthermore, the effects of the diameter of the core yarn and tensile modulus of the wrap yarn on the auxetic behavior were systematically investigated. It is found that a larger NPR can be obtained with a thicker diameter of core yarn and a higher tensile modulus of wrap yarn. It is also demonstrated that an appropriate combination of the component modulus and geometric parameters is essential to fabricate HAY with an obvious auxetic behavior.
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Feng, Pei, Pei Feng, Ronggen Zhang, Jiajia Gan, Chongchang Yang, and Chongchang Yang. "High Efficiency Covering Technology for Covered Yarns Production: Equipment and Experimente." Fibres and Textiles in Eastern Europe 25 (June 30, 2017): 73–78. http://dx.doi.org/10.5604/01.3001.0010.1693.

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A new covering technology for producing covered yarns is proposed in this article. On a traditional yarn covering machine, a hollow spindle rotates with a bobbin of the outer wrapping yarn. In the new equipment, the turntable rotates with only one single outer wrapping yarn. With a magnetic device, the bobbin of core yarns is suspended in a balloon formed by outer wrapping yarns. The rotation speed of the turntable can reach 40000 rpm. A series of experiments on the new equipment were conducted and some covered yarn samples were obtained. The performance of these samples were tested and compared with that produced by traditional machines.
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Alshukur, Malek, and Daniil Yurchenko. "Experimental study on the spinning geometry of multi-thread fancy yarn on hollow-spindle spinning machines." International Journal of Clothing Science and Technology 31, no. 4 (August 5, 2019): 454–61. http://dx.doi.org/10.1108/ijcst-05-2017-0065.

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Purpose The purpose of this paper is to define the relationships between the structure of multi-thread fancy yarns and the combination of the rotational speed of the hollow-spindle spinning system and thickness and stiffness of the effect component. Design/methodology/approach To do so, two groups of fancy yarns were made using stiff and soft effect threads and at six different machine settings. Findings It was found that the stiff effect thread was suitable to make fancy yarns at low rotational speeds, while the thickness of the effect threads was more important than its stiffness at low number of wraps. Additionally, even when using the same number of wraps and the overfeed ratio, a bouclé yarn, a gimp yarn, a wavy yarn or a loop yarn may results if the thickness and stiffness of the effect thread and the rotational speed were all controlled properly. Originality/value This study helps fancy yarn spinners to determine the type of final fancy yarns by controlling the spinning geometry in the first spinning zone.
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Lin, Jia Horng, Zhi Cai Yu, Jian Fei Zhang, and Ching Wen Lou. "Manufacturing Techniques and Functional Properties of the Bamboo Charcoal/Antibacterial/Stainless Steel Metal Composite Woven Fabric." Advanced Materials Research 910 (March 2014): 238–41. http://dx.doi.org/10.4028/www.scientific.net/amr.910.238.

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In this research, the B/A/S composite yarns were fabricated using the stainless steel wires as core yarn, antibacterial nylon and bamboo charcoal polyester filaments as inner wrapped yarn and outer wrapped yarn, respectively. The composite yarns with a wrapping number of 8, 11, 14 turns/cm were fabricated on a hollow spindle spinning machine. Furthermore, the composite fabrics were woven with the B/A/S composite yarns as weft yarns and the PET as the warp yarns. These fabrics were evaluated in terms of far infrared (FIR) emissivity and the air permeability. The presence of the bamboo charcoal was found to increase the FIR emissivity. The highest of the FIR emissivity was obtained when the weft yarns with a wrapping number of 11 turns/cm. The lamination numbers of the woven fabrics varied from 1-5 layers. The far infrared emissivity and air permeability of the woven fabrics was 0.94 and 268 cm3/cm2/s when the lamination numbers was 2 layers and the wrapping number was 11 turns/cm.
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Moučková, Eva, Iva Mertová, Petra Jirásková, Gabriela Krupincová, and Dana Křemenáková. "Properties Of Viscose Vortex Yarns Depending On Technological Parameters Of Spinning." Autex Research Journal 15, no. 2 (June 1, 2015): 138–47. http://dx.doi.org/10.2478/aut-2014-0046.

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AbstractThis paper analyzes the relationship between technological parameters of spinning of 100% CV Vortex yarns of different counts and its selected geometrical parameters (a lead of helix of wrapping fibre ribbon, yarn diameter) as well as yarn properties. The number of twist of wrapping fibre layer is determined. The effect of the yarn delivery speed, hollow spindle diameter, and the main draft on the hairiness, mass irregularity, tenacity, elongation, resistance to abrasion and bending rigidity of Vortex yarn is observed. The yarn properties are compared with the properties of open-end rotor spun yarns. Slivers of the same spinning lot were used for the production of both kinds of yarn. The results showed that the delivery speed in combination with spindle diameter affects yarn diameter, hairiness and abrasion resistance. Mass irregularity and imperfections of yarn is mainly affected by the main draft of drafting unit. Technological parameters of spinning do not affect the level of bending rigidity of the Vortex yarn. Tested rotor spun yarns had a larger diameter, higher hairiness, lower tenacity and higher elongation, lower mass irregularity and number of imperfections, higher abrasion resistance and lower bending rigidity compared to tested Vortex spun yarns.
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Alshukur, Malek, and Alex Fotheringham. "Study of maximum tensile strength of fancy yarns using the design of experiments." Mechanics & Industry 20, no. 4 (2019): 403. http://dx.doi.org/10.1051/meca/2019033.

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This study was conducted to identify the factors and the interactions which affect the maximum load of multi-thread fancy yarns. The objectives of this research was to identify the relative contribution of each factor and interaction leading to the maximisation of the tensile strength. The fancy yarns were made on a hollow-spindle spinning machine. The experimental design of this study had seven factors – with two levels each and was repeated five times. It was found that using two single yarns, instead of a similar two-ply yarn, for the core component increased the value of maximum load. The effect component contributed positively to the load only when it was a three-ply cotton yarn rather than a three-ply bamboo yarn since the former had interactions with the core and the binder. Excessive wraps reduced the maximum load. The effect of the overfeed ratio on the maximum load was weak. The manufacturing process in general had low levels of variability. This research is important because it contributes to a broader understanding to the effect of seven factors on the structure, quality, and mechanical properties of multi-thread fancy yarn.
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Dissertations / Theses on the topic "Hollow yarns"

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Kanesan, Jayaprakash, and jaykanes@gmail com. "Studies in Development and Design of Hi-Performance Yarns." RMIT University. Fashion and Textiles, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080702.141430.

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The aim of the research was to produce hollow yarn knitted fabrics with improved thermal comfort properties. Thermal comfort properties and utility properties determine the wearing comfort of textiles and the suitability of a new textile product for a particular application. Both, Thermal comfort properties such as thermal absorptiveness, thermal conductivity, air permeability and utility properties like percent stretch, spirality, bursting strength of core yarn knitted fabrics and hollow yarn knitted fabrics were assessed. A new method was proposed and discussed for producing hollow yarns at fabric stage (in this case knitted fabric) which involved the following steps: - a) Production of ring spun yarns, comprising nylon as a core and cotton as a sheath, using Ring Spinning System. b) Production of knitted fabrics of different knit structures viz., single jersey, rib and interlock using above mentioned yarn. c) Dissolution of core element i.e. Nylon into formic acid to obtain hollow yarn knitted fabrics and this hollow yarn knitted fabrics can be tailored for specific end use. The study covers comparative analysis of thermal insulation properties like thermal absorptiveness, thermal conductivity and others for core yarn knitted fabrics and hollow yarn knitted fabrics and the influence of the count of core nylon filament and the type of knit structures on the thermal properties of the fabrics. Based on the results obtained from the work, it can be stated that hollow yarn knitted fabrics offer numerous possibilities for creating fabric properties which influence their comfort of use.
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Mahgoub, A. O. "The properties of yarns and fabrics using the hollow spindle technique." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234383.

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Overington, Y. H. "Aspects of hollow spindle fancy yarn." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556105.

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Srinivasan, K. V. "A study of the principles of hollow spindle wrap spinning." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556204.

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Books on the topic "Hollow yarns"

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Herron, Rachael. Wishes and stitches: A Cypress Hollow yarn. Waterville, Me: Kennebec Large Print, 2012.

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Wishes and stitches: A Cypress Hollow yarn. New York: William Morrow Paperbacks, 2011.

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Herron, Rachael. How to knit a love song: A Cypress Hollow yarn. Waterville, Me: Kennebec Large Print, 2010.

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Herron, Rachael. How to knit a love song: A Cypress Hollow yarn. Detroit: Kennebec Large Print, 2010.

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Herron, Rachael. How to knit a love song: A Cypress Hollow yarn. New York: Avon A, 2010.

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Herron, Rachael. How to knit a heart back home: A Cypress Hollow yarn. New York: Avon A, 2011.

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Herron, Rachael. How to knit a heart back home: A Cypress Hollow yarn. Waterville, Me: Kennebec Large Print, 2011.

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Herron, Rachael. How to Knit a Heart Back Home: A Cypress Hollow Yarn Book 2. HarperCollins Publishers, 2011.

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Book chapters on the topic "Hollow yarns"

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Angelova, R. A. "Hollow spindle spinning." In Advances in Yarn Spinning Technology, 345–64. Elsevier, 2010. http://dx.doi.org/10.1533/9780857090218.2.345.

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Lane, Belden C. "Solitude: Bell Mountain Wilderness and Søren Kierkegaard." In Backpacking with the Saints. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199927814.003.0015.

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It is an uncommon gift to have a mountain to yourself. Pulling up to the trailhead for the Bell Mountain Wilderness Area, I saw no other vehicles parked there and began to hope for as much. I noticed that the dirt road into the area hadn’t been graded recently. Another good sign was my having to wipe spider webs from my face every hundred yards or so as I hit the trail. Obviously no one had been there for a while. But the real treat was reaching the top of the mountain and finding nothing. A favorite campsite lay empty, nestled in the rocks just above the treetops. From there you can look out onto thousands of acres of oak- and hickory-covered hills to the east. Not a road or a building in sight, nothing but trees. Bell Mountain is one of eight protected wilderness areas in Missouri. It is named after a family that once lived and farmed along its 1,700-foot ridge. I’d gotten a late start that day and the sun was going down by the time I set up camp. But sunlight on a late April afternoon, filtered through the yellow-green growth of new leaves, can be stunning. I sat on a rock ledge, cutting up potatoes, onions, and carrots for mulligan stew, watching shadows creep up the hills across the hollow. Putting the vegetables in a pot, I added fresh basil and rosemary, topped it off with ground beef, and washed it down with a shot of Grand Marnier as night came on. I delight in the solitude of these trips, but I’m not always sworn to a monastic austerity. Bell Mountain is a good place for the study and practice of solitude. I’ve sat there for hours with only the dog beside me, watching red-tailed hawks and turkey vultures soar on thermals rising from the forest below. Now and then you’ll see a lone eagle high overhead, though generally they nest closer to the river. Bald eagles are common in Missouri, especially in winter.
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Conference papers on the topic "Hollow yarns"

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Perera, T. G. Y. S., M. P. S. Mohotti, and M. Y. A. Perera. "Stretchable Conductive Yarn for Electronic Textiles Made Using Hollow Spindle Spinning." In 2018 Moratuwa Engineering Research Conference (MERCon). IEEE, 2018. http://dx.doi.org/10.1109/mercon.2018.8421958.

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Bogdanovich, Alexander, and Dmitri Mungalov. "A Novel 3-D Braiding Technology, Complex Shape Preforms and Composites." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39478.

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A brief overview of 3-D braiding technology and its two major branches, “row and column” and “rotary” braiding, opens the paper. An innovative 3-D braiding process that has been recently patented and implemented in a fully automated multi-modular industrial scale machine is introduced next. The machine enables producing complex, continuously variable shape preforms for composite structures. Each module of the machine incorporates some number of horngears with four yarn carriers placed on each of them. A novel gate switch mechanism, based on the gripping fork controlled rotation, provides smooth transfer of yarn carriers between adjacent horngears. Each gripping fork is controlled individually, thus allowing fabricating practically unlimited variety of complex cross section 3-D braided preforms. Examples of manufactured braided products include rectangular bars, T-, I- and J-stiffeners, box-beams, hollow tubes, etc. Results and discussion of mechanical characterization of 3-D braided carbon and E-glass composites conclude the paper.
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