A biaxial stretcher which uses an Instron tensile testing machine to drive its stretching mechanism has been designed and constructed. The new stretcher is capable of producing biaxially oriented polymer sheets under controlled drawing and annealing conditions and has enabled a fundamental study to be made of the parameters that influence the properties of biaxially oriented polymer products. The parameters of interest are draw ratio, draw rate and draw temperature, and the subsequent annealing conditions of temperature and time.
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Hitt et al. (1994) studied this question.
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