The melt-spinning process, normally used to convert anisotropic pitch into carbon fibers, is similar to those used for many thermoplastic polymers. Briefly, the pitch is melted in an extruder and forced to pass through a spinnerette. The mesophase pitch based carbon fibers prepared by melt spinning, which is a key step in the producing process, are used in high strength structural materials. Tensile strength is a very important mechanical property for carbon fibers in all applications. It is governed mainly by the local defects and the structure of fibers. The control of structure and the interaction between the structure and properties has been extensively studied since 1960s .
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