Described the traditional injection molding techniques,injection molded parts will produce weld marks and silver patterns that difficult to avoid defects and analysis of the causes of these defects,highlighting the steam-mode technology in flat-panel TVs face frame molding applications.

The specimens are loaded for a defined period of time under creep condition with defined temperature,after which the craze densities are measured with an optical microscope.

The existence and characters of crazes were proved and the compensating mechanism of crazes was put forward.

In the view of that the craze is a manner of nonli\|near deformation of polymers, a series of experiments on the stress induced craze and craze damage in the crack tip of modified polypro\|pylene were made by using Moir technique.

The interfacial debonding, crazing and shear yielding are analysed when the interaction among the muIti-particle is taken into account.

The entire procedures of the crazing induction-formation-destroy of the PVC/MBS mixtures under stretching stress were observed by SEM, and it was illustrated by the density determination and inmer structure of the crazing that the material had been left "empty ".

Transmission electron microscope(TEM) showed that SAN component promoted the crazing and PVC the shear yielding.

Vacuum sealability of silver wire;

At the same time, through the microscope test of surface, the effect on craze density by strain rate has been investigated as wel.