IC plastic packaging residual stress observation and comparison method

The invention relates to an IC plastic packaging residual stress observation and comparison method comprising the following steps that (1) selection of plastic packaging material is performed: appropriate transparent plastic packaging material is selected to replace original color material according to the similarity theorem, and a physical similarity model is established; (2) plastic packaging is performed: the selected transparent plastic packaging material is utilized to complete plastic packaging on a plastic packaging pressing machine by adopting the plastic packaging technology of the original color material; (3) acquisition of stress polarization figures is performed: a stress polariscope is adopted to acquire the stress polarization figures of packaging bodies after plastic packaging after completion of plastic packaging on the plastic packaging pressing machine; (4) the change situations of chromaticity of the stress polarization figures and stress of test pieces under different conditions are compared; and (5) residual stress of the original color material is approximately calculated by utilizing the similarity theory. Distribution of the residual stress can be visually observed by the method, and the size of the residual stress under different conditions is compared together with the change law of the size of the residual stress along with other conditions so that the method can be used for the research of improvement of the technology scheme and the mould structure, and plastic packaging quality and efficiency can be enhanced.