To provide guidelines and a basic understanding of static and continuous zone drawing processes,we propose two different mathematical models in terms of the processing conditions and material parameters.Although the models are not finely tuned,because of assumptions made,they are still useful for the analysis of the process and for predicting the processibility.Zone drawing process has been studied as a method to impart superior mechanical properties to fibers or films produced from polymers.When fiber or film has been heated locally by heat band under applied load,the heated part of the specimen will be stretched.With the extension,the degree of polymer chain orientation in the heated zone will be increased depending on the processing condition and material properties.When the polymer chain is flexible and the heating time is long enough to transfer heat from the band to the material,the chain will be fully extended.As a result,the polymer obtains high strength and high modulus.
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