Yarn Quality Improvement in Vortex Yarn
VORTEX SPUN YARN VS. AIR-JET SPUN YARN
Dr.N.Ramakrishnan MTech CText ATI
(UK)PhD(Cal.,USA)
Abstract
Vortex spinning can be viewed as a refinement of jet spinning, or a natural development in fasciated yarn technology. As in all other fasciated yarns, the structure of vortex yarn consists of a core of parallel fibres held together by wrapper fibres. This has been revealed by examining an untwisted vortex yarn sample under the Scanning
Electron Microscope. Subsequently, the physical properties of vortex and air-jet yarns produced from different polyester cotton blends were compared. Results indicated that vortex yarns have tenacity advantages over air jet yarns, particularly at high cotton contents. Keywords: yarn spinning, vortex spinning, air-jet spinning, vortex yarn structure
Introduction
Yarn structure is one of the primary factors which control the properties of spun yarns. Vortexspun yarn has a two-part structure. This can be simply revealed by untwisting a vortex yarn by hand.
Because the yarn is a relatively small component, any more reliable conclusion requires visual aid. As a first step in such study, a piece of vortex yarn was untwisted and viewed under the Scanning
Electron Microscope. Since none of the conventional twist measurement methods are suitable for vortex spun yarns, the untwisting was performed with the aid of an optical microscope, and the completion of untwisting was visually confirmed. SEM images confirmed that vortex yarns consist of two distinctive parts: the core and the sheath. In the images, the sheath part appeared looser due to removed twist (Figure 1).
Only limited information was obtained through the SEM images. In order to broaden our knowledge about this new and fascinating yarn technology, the next logical step was to compare the properties of air-jet and vortex yarns. Although both systems are used to spin fasciated yarns, no work has been reported to date regarding the difference between these
Dr.N.Ramakrishnan MTech CText ATI
(UK)PhD(Cal.,USA)
Abstract
Vortex spinning can be viewed as a refinement of jet spinning, or a natural development in fasciated yarn technology. As in all other fasciated yarns, the structure of vortex yarn consists of a core of parallel fibres held together by wrapper fibres. This has been revealed by examining an untwisted vortex yarn sample under the Scanning
Electron Microscope. Subsequently, the physical properties of vortex and air-jet yarns produced from different polyester cotton blends were compared. Results indicated that vortex yarns have tenacity advantages over air jet yarns, particularly at high cotton contents. Keywords: yarn spinning, vortex spinning, air-jet spinning, vortex yarn structure
Introduction
Yarn structure is one of the primary factors which control the properties of spun yarns. Vortexspun yarn has a two-part structure. This can be simply revealed by untwisting a vortex yarn by hand.
Because the yarn is a relatively small component, any more reliable conclusion requires visual aid. As a first step in such study, a piece of vortex yarn was untwisted and viewed under the Scanning
Electron Microscope. Since none of the conventional twist measurement methods are suitable for vortex spun yarns, the untwisting was performed with the aid of an optical microscope, and the completion of untwisting was visually confirmed. SEM images confirmed that vortex yarns consist of two distinctive parts: the core and the sheath. In the images, the sheath part appeared looser due to removed twist (Figure 1).
Only limited information was obtained through the SEM images. In order to broaden our knowledge about this new and fascinating yarn technology, the next logical step was to compare the properties of air-jet and vortex yarns. Although both systems are used to spin fasciated yarns, no work has been reported to date regarding the difference between these
References: [1] Klein, W., New Spinning Systems. The Textile Institute Manual of Textile Technology, Stephen Austin and Sons Limited, UK, 1993. [2] Oxenham, W. and Basu, A., ‘Effect of Jet Design on the Properties of Air-jet Spun Yarns.’ Textile Res. J, 63(11), 674-678(1993) [3] Nakahara, T., ‘Air-jet Spinning Technology.’ Text. Tech. Int., (1988): 73-74 [4]