Cold drawing
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Cold drawing is a process, for example used in cable core production. Starting from a 1 cm (0.4 inch) thick Cu wire, slowly this is drawn more and more, and eventually small thin wires of 1 micrometer in diameter can be obtained.
Cold drawing is a procedure in manufacturing polymer plastic fibers. It was discovered by Julian Hill in 1930 while trying to make fibers from an early polyester, a precursor to nylon. It is performed after the material has been "spun" into filaments. Here, spinning does not mean twisting fine textile filaments, but rather extrusion of a polymer melt through pores in industrial spinnerets. During this process, the individual polymer chains tend to align because of viscous flow. If subjected to cold drawing afterwards, the fibers align further, increasing their crystallinity,[1] and the material acquires additional tensile strength.[2]
