Abstract: The influencing factors of orientation structure in conventional processing are studied in this paper, the effect of vibration field on the orientation structure is analyzed from microstructure configuration. It is found that dynamic molding processing can improve the orientation structure efficiently compared with the conventional molding processing method. The tensile strength of the products by vibration injection is superior to that by conventional processing. The orientation index of dynamic molding product is determined by infrared spectrometer (FT-IR). It is found that the orientation of core layer of the product was enhanced more evidently than the skin layer, thus the difference in orientation between the core layer and skin layer is decreased. It is showed that the mechanical property can be improved by enhance the orientation structure.

Key words: vibration force field, morphological structure, orientation function, injection molding, tensile strength