Composite Yarn Spinning

The bicomponent fiber technology began in the 1960s on polyester and polyamide fibers. This technology encompasses a vast variety of polymers, filament shapes, and processes. As recent examples, Howe et al. [394], Wu [395], and Talley et al. [396] have disclosed spin-texture processes for the preparation of self-crimped polyamide bicomponent fibers. DuPont [397] disclosed the method for high-speed spinning bicomponent fibers. The use of a bicomponent yarn with another yarn to form a composite yarn bundle has been taught by Stevenson et al. [398] and others. 

Folded yarn Also known as ply twisting, formed from two or more yams twisted together to increase strength and/or improve appearance. Spun staple fiber yams are ply twisted in direction opposite to spinning twist to give resultant composite yarn with virtually zero twist. 

Bobkowicz E. and Bobkowicz A.J. (1974b), Aerodynamic spinning of composite yarns, USP 3848403. 

Research effort at Albany International Research Co. has developed unit processes necessary for pilot scale production of several species of reverse osmosis hollow fiber composite membranes. These processes include spin-dope preparation, a proprietary apparatus for dry-jet wet-spinning of microporous polysul-fone hollow fibers, coating of these fibers with a variety of permselective materials, bundle winding using multifilament yarns and module assembly. Modules of the membrane identified as Quantro II are in field trial against brackish and seawater feeds. Brackish water rejections of 94+% at a flux of 5-7 gfd at 400 psi have been measured. Seawater rejections of 99+% at 1-2 gfd at 1000 psi have been measured. Membrane use requires sealing of some portion of the fiber bundle for installation in a pressure shell. Much effort has been devoted to identification of potting materials which exhibit satisfactory adhesion to the fiber while... 

Widely used industrial approaches for the produetion of polymer fibres and yarns, such as coagulation spinning and electrospinning, have also been utilised for the fabrication of polymer nanotube eomposites. In coagulation spinning, for example, composite fibres ean be produced by an injection of surfactant-stabilised nanotube dispersion in water into a rotating bath of polymer e.g. PVA) dissolved in water sueh that nanotube and polymer dispersions flowed in the same direction at the point of injection. In this case, polymer molecules replace surfactant molecules on the nanotube surface, thus destabilising the nanotubes dispersion whieh eollapses to form a fibre. These fibres can then be retrieved from the bath, rinsed and dried. 

Bazbouz M B and Styfios G K (2008) Novel mechanism for spinning continuous twisted composite nanofiber yarns, Eur Polym J 44 1-12. 

Key words integrated composite spinning (ICS), Bobtex, hybrid yarns. 

Bobkowicz A.J. (1975b), Bobtex integrated composite spinning yarns applications and possible offsprings. Modem Textiles, June. 

Mohamed M.H., Rochow T.G. and Heeralal R. (1974), Some structural and physical properties of yarn made on the integrated composite spinning system. Part II Three-component yarn. Textile Research Journal, 44,206-213. 

Wet spinning of acrylic fibers may be carried out in a variety of precipitating baths. Glycerol or water is used in the baths. Meanwhile, no specific method has been released for a particular yarn production yet. Differences in bath composition result in significant differences in the properties of the acrylic fibers produced. 

The tearing fibers produced according to the processes described can again reach the textile production process as raw materials. This happens, for example, in the field of woolen spinning (outerwear fabrics, carpet yarns), nonwoven production (sound and heat damping materials), and for the production of composites for the automobile industry (hat racks, inside covers). Additional applications are cleaning and wiping cloths made from woven friction yarns or from stitch-bonded nonwovens. 

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