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The changes of structure and properties of Nylon 6 fiber, by heat treatment were studied under various conditions of water vapour pressure. The changes of structure and properties such as strength. Young's modulus, density, intensity of small angle X-ray diffraction showed good correlations with the change of water vapour pressure in the closed vessel used for heat treatment of Nylon 6 yarn. Fig. 5. Water vapour pressure vs temperature in the closed vessel used for heat treatment. The points of B, C. and D are turning temperatures of water vapour pressure.