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1 Vinyon
Vinyon is derived from a vinyl resin, which is known chemically as a co-polymer of vinyl chloride and vinyl acetate. The vinyl resin, in the form of a dry powder, is dispersed in acetone, the dispersion is then filtered through a filter press, and de-aerated by allowing it to stand for 48 hours. Extrusion of the filaments is carried out by a dry spinning process. After the filaments have been allowed to stand for at least 12 hours, they are wet twisted, and the twisted yarn is then stretched by means of a suitable device to about 140 per cent of its original length. Two types called Type 1 and Type 2 are in general use. Vinyon E, produced by a modified process, has high elasticity and differs from the regular types of Vinyon in certain other properties. Applications for Vinyon include filter fabrics, fish lines, nets, acid and alkali resistant fabrics and clothing, protective pipe covering, elastic insulation, shower curtains, bathing suits, waterproof clothing, fireproof awnings and curtains, hosiery and fusible shape-retaining fabrics. Staple fibres mixed with cotton or wool are used in making felts and permit production of fabrics which will maintain a pressed crease or fold. Vinyon E is suitable where high elasticity is desirable in cords, braids and woven or knitted fabrics. Uses include suspension for jungle hammocks, heavy duty suspenders for aviators' suits, surgical stockings, knee braces and metatarsal bandages.
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