Conclusions
-- Analysis of the patent literature has shown that to obtain synthetic strings with playing properties close to those of strings from natural raw material and with a good lifetime, one uses a construction which includes a core and winding of monofilaments or complex yarns and an envelope (coating). To obtain flexible elastic strings, it is preferable to use complex yarns, especially in the core. To wind the core, thin textile monofilaments are recommended most often.
-- One of the basic items is the selection of the starting material for making the component parts of the string. The most widespread materials for the core and winding are polyamide-6 or −66; more rarely, polyethylene terephthalate; for the envelope, a polyurethane or polyamide-6; more rarely, epoxy resins. Yarns for making the core and winding are spun from synthetic polymers, mainly by the extrusion method. Application of the polymeric envelope is also recommended to be done by the extrusion method.
-- To increase resistance to abrasion, methods have been proposed for preparing strings with metallic coatings, with a coating with fluorine-containing resins, with various geometric profiles of the cross section, and the various forms of build-up on the surface.
-- Resistance to the action of UV-rays is increased by introducing into the envelope an antioxidant, carbon-containing organic compounds, and also application of a thin metallic coating on the string; resistance to atmospheric action, by introducing various types of oils and greases.
-- For strength in the string, it is recommended to use high-strength thermoplastic polymers of the aramide type or aromatic ketones.
-- High elastic properties of the strings are achieved by the use of special impregnated cements or binders, or by fibrillated film with various tensions and degrees of stretch, by the use of the process of string setting under tension, or by changing the angle of winding of the core with respect to the string axis.
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Additional information
UKrNIIV, Kiev. Translated from Khimicheskie Volokna, No. 5, pp. 32–38, September–October, 1992.
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Rudenko, L.G., Nosov, M.P. & Shokol, F.I. Tennis strings and methods of making them (review). Fibre Chem 24, 380–389 (1993). https://doi.org/10.1007/BF00551586
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DOI: https://doi.org/10.1007/BF00551586