By R Alagirusamy, Apurba Das
Technical yarns are produced for the manufacture of technical textiles. because the diversity of technical textiles is speedily expanding, an figuring out of the yarns to be had and their homes is critical on the way to meet the necessities of the meant end-use. This ebook covers a wide selection of parts inside of fabric purposes. the 1st a part of the booklet starts off through reviewing the advances in yarn creation. The textual content examines advances in fabric yarn spinning, amendment of fabric yarn constructions, the relief of yarn hairiness, and coatings for technical fabric yarns. the second one workforce of chapters describes the variety of technical yarns for biomedical purposes, equivalent to electro-conductive cloth yarns, novel yarns, and plasma handled yarns. Technical stitching threads and biodegradable cloth yarns also are mentioned.
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Example text
Greater molecular attraction in the form of hydrogen bonding and dipole interaction increase transverse strength and hence ability to split. Various fibrillation techniques are as follows. Uncontrolled fibrillation ∑ Twist fibrillation: This is the simplest process of fibrillation. Twisting of highly stretched film tape to over 100 turns/m on a ring twister results in fine fibrillation. The shearing force due to twisting leads to shearing action resulting in the splitting of the structure. The cross-section of the fibrillated fibre segments varies in thickness and linear density.
High twist tyre cords are preferred to be twisted by ring twister. Up-twister In up-twisting (Fig. 16(a)) the supply package of suitable size is first formed and fixed on a spindle. As the spindle rotates at a constant speed a balloon gets formed and generates one turn in the yarn per revolution. The yarn is withdrawn at a constant rate and wound on a take-up package. The yarn passes through a flyer that rotates at a speed that is decided by the rate of yarn withdrawal and the bobbin diameter. 16 (a) Up-twister; (b) two-for-one twister.
1 Role of fibre parameters Fibre diameter Fibre diameter, density and fineness are related to each other. e. fineness) of fibres used in technical textiles ranges from 2 to 7 denier. 3 denier. Monofilament could be of 15 denier. 89 ¥ 10 –4 w cm rf where w = fibre linear density (denier) and rf = fibre density (g/cm3). © Woodhead Publishing Limited, 2010 38 Technical textile yarns Filament diameter therefore increases with fibre denier and decreases with density of the fibre. Yarns made from finer fibres will be compact and will hold less air between the fibre interstices.