It is role breakthrough that the microcellar plastic mold replaces gypsum mold, as well as itwas the tendency in the future.

Application of supercritical CO_2 in preparation of microcellular plastics in continuous extrusion;

The conception, foaming principle, phylogeny and four preparation method including thermally induced phase separation, monomer polymerization reaction, gas supersaturation and precipitation with a compressed fluid antisolvent of microcellular plastic were summarized.

The application of supercritical CO_2 in extrusion process was discussed respectively according to de- crease the polymer melt viscosity and as a foam agent for prepare the microcellular plastic.

Study of Moulding Process of Microcellular Plastics;

Study of Supercritical Fluid in Extrusion of Microcellular Plastics;

Study on Effects of Vibration on Cell Structure of PS and PVC Microcellular Plastics;

Development of the Breathable Steel and the Research of Its Application in the Plastic Mould;

Influence of the injection pressure to plastic mould core offset;

Study of the technology and fraction properties on chemical composition coating of the plastic mould;

Establishment of plastic die design quality evaluation system

In this paper,the methods have been found out to improve the resistance for the high temperature erosion-oxidation of plastic dies through the research for the reason of erosion-oxidation of dies surface that causes the invalidation of dies.

The applications of low carbon martensite in plastic die,cold-working die and hot-working die in recent years were summarized.

Development trend and classif ication of new material for injection mold;

Design and produce of CAD/CAM system of injection mold based on UG;

Design of an electronic spacer for screw thread core pulling in injection mold;