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1, Growth in demand of carbon fibre over 50 years from 1970 -2020 (2)

1, Growth in demand of carbon fibre over 50 years from 1970 -2020 (2)

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Polyacrylontrile nanofibre yarns have been successfully produced from an electrospinning setup composing positively and negatively charged spinnerets, a rotating funnel and a yarn winder. Through hot drawing, yarns show compact morphology and improved uniformity and have a significant decrease in both yarn and fibre diameters. The hot drawing has i...

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Citations

Article
Nanofiber production by electrospinning has become a common production method as it is an easy and flexible system producing nanofibrous webs. However, direct spinning of nanofibers into a yarn would lead to conversion of nanofibers into woven or knitted fabrics easily, therefore improving end-use possibilities of these fibers substantially. In this work a successful nanofiber yarn spinning system using polyacrylonitrile polymer is established and yarn formation by polymers ejected from two nozzles with opposite charges was analysed and potential of this system for bicomponent yarn production was shown. Fiber formation from each nozzle was also examined by high speed camera while distribution of the electric field strength and loads in the electrostatic state was analysed by electric field simulation . Finally, polyacrylonitrile nanofiber yarns produced at different collector and winding speeds were analysed in terms of fiber and yarn properties. Furthermore, the first fabric sample with nanofiber yarns woven manually was presented.
Article
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Direct conversion of nanofibers into a yarn formed by electrospinning has begun to draw attention recently while pioneering attempts in fact go back to 1930s. Once nanofiber yarns are spun successfully by electrospinning, obviously, this would open new gates for many different applications. However, this is still a challenging task and there is no system accepted universally yet. There are more than 20 different approaches available so far but with serious limitations. In this review, they were categorized as (i) systems for production of parallel bundle of nanofibers and (ii) systems for production of twisted nanofiber yarns, presenting potential applicability of each with a critical point of view. The results show that some of the attempts mainly present basic conceptual ideas only. There are some works to produce real twisted nanofiber yarns continuously while mainly funnel, disc, or ring collectors have been used as the twisting element. However, there is limited information regarding stability of spinning system or control of yarn properties. This review also analyses the technical properties of electrospun nanofiber yarns summarizing the available data in terms of yarn properties such as fiber fineness, twist, production speed, mechanical properties, polymer types, and other important parameters available.
Article
Nano-size fiber production by electrospinning has been a common application method recently due to both being an easy and flexible system and high performance of the fibers produced. Generally in this system, fibers are produced directly as a non-woven surface of fiber-web and this limits potential end-uses of these high performance fibers. However direct spinning of these special fibers into a yarn form rather than production as a web-surface by electrospinning method would lead to an easy conversion of these fibers into woven or knitted fabrics and therefore widen the use area of these fibers substantially. In this respect, this work describes the novel approaches and methods for nanofiber yarn production by electrospinning classifying available but limited studies into two main categories: (i) parallel bundle of nanofiber yarn spinning methods, and (ii) twisted nanofiber yarn spinning methods. The results show that these highly special nanofiber yarns, which can have desired fineness, twist and functionality, could easily be designed and spun for a specific enduse by careful selection of the spinning method, choice of polymer and production parameters.