makes nylon of great value in the manufacture of hosiery. Elasticity is achieved by drawing the yarn to some four to seven times its original length, it becoming truly elastic, with the result that if stretched further, it springs back to the length it originally was before it assumed the property of true elasticity. Tensile strength factor is brought about by the long, “oriented” molecules (10 to 12 millionths of an inch long) lying close together, and giving rise to powerful inter-molecular forces which resist slipping of the molecules when tension is applied. The breaking of the yarn, or fabric, is due only to separation by force of the parallel molecules, so breaking down the great resistance to separation which is created by the extreme length of the molecular chain in the nylon filament. It is this combined strength-elasticity factor of drawn nylon which causes the yarn to lend itself so well to the manufacture of fine gauge hose. Until the development of nylon yarn, silk was the only textile fibre which possessed the strength-elasticity demanded of a stocking yarn, in contrast to rayon, which can be made strong enough for use in hosiery, but which lacks the elasticity necessary if a stocking is to hold its shape after being stretched.
The question now arises, “Will nylon hosiery outlast Silk Hose”? Here, the weight, grade, and the quality of the workmanship entering into the manufacture of the hosiery are interdependent, but assuming all these factors to be equal, stockings made from nylon, because of its superior strength-elasticity property, wear at least as long as other high-quality hosiery of the same construction. In the yarns of the future, therefore, nylon offers a serious challenge to silk.
THE PROPERTIES OF NYLONWonderful claims are made for stockings manufactured from nylon, this providing a sheerness with reasonable strength far ahead of that found in any other sheer type of hosiery available at the present time. Nylon has also a good clinging quality, and a splendid elastic property, this property of elasticity persisting whether the hose be wet or dry.
Toughness. Oriented nylon is extremely tough. (While the term, “toughness” is not easy to define, a material is said to be