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Author(s): Irina Tărăboanţă

Journal: Annals of the University of Oradea. Fascicle of Textiles, Leatherwork
ISSN 1843-813X

Volume: XIV;
Issue: 2;
Start page: 155;
Date: 2013;
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Keywords: bicomponent fibers | biconstituent fibers | spinning | microfiber | mix-polymer

Bico fibers include bicomponent and biconstituent fibers.Bicomponent fibers are synthetic fibers made from two polymers of different chemical and physical structure.They are produced by common melt-drawing processes similar to conventional synthetic fibers.[1]. The biconstituent fiber consists of a continuous matrix of one polymer in which a different fiber-forming polymer is dispersed as a second distinct discontinuous phase; it as mix-polymer fiber or fascicular microfiber because the microfibers are connected to each other and can’t function independently from each other.[2]. Among bicomponent fibers, the bicomponent microfiber is different from the core-sheath type of bicomponent fiber.In theory bico fibers can be made from many polymers but in fact, they are made frequently from CoPET/PA because of cost factors. The core-sheath bico fiber, including such varieties as PE/PP, PE/PET and CoPET/PET are used as bonding fibers for hygiene and medical nonwovens.A cross-sectional morphology of bicomponent fibers can be classified into four main types:”core-sheath”,”side-by-side”,”pie-wedge” and “islands in the sea”. The core-sheath and side-by-side bicomponent fibres are the basic structures of bicomponent fibres.Methods for the preparation of more complex bicomponent nanofibres such as island-in-the-sea and pie-wedges have yet to be developed. This four basic configurations can be adapted in function of the desired fibre or yarn properties.It is for exemple possible to limit the number of islands to produce conductive yarns. On the other hand it is possible to provide a hole in the pie-wedge configuration to split the filaments even more easily. The newly created bicomponent fibre have new properties and can be applied in many new applications.Bicomponent fibres are actually being applied in the production of : microfibres (hygiene), non-wovens, antimicrobial textiles, elastic fibres, conductive fibres and composites.
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