Method of making EVA shoe midsole

A method of making EVA shoe midsole including a compound containing in percentage by weight the substances such as 100% of ethylene vinyl acetate (EVA) into which 5-40% of filling agent, 1-10% of foaming agent, 0.5-3% of bridging agent, 0.5-5% of finishing aid, 0.1-1% of foaming aid and coloring agent are added under temperature in a range of 80-110 degrees in Celsius, said method being characterized in that:

• (a) a preliminary blank is formed in a primary mold by means of a quantitative injection molding under temperature in a range of 80-110 degrees in Celsius, said primary mold having therein mold cavities with size smaller than that of a midsole intended to be made;
• (b) said preliminary blank is foamed to form a molded blank under heat and pressure so as to ensure that the size of said molded blank corresponds to that of said midsole, said heat and said pressure being respectively in a range of 140-170 degrees in Celsius and in a range of 80-150 kg/cm.sup.2 ;
• (c) said molded blank is treated in a secondary mold under heat and pressure and is subsequently cooled to take form, said secondary mold having mold cavity with size and shape corresponding to the size and the shape of said midsole, said heat and said pressure being respectively in a range of 140-170 degrees in Celsius and in a range of 50-100 kg/cm.sup.2, and said molded blank being cooled at the temperature ranging from 5 degrees in Celsius to 30 degrees in Celsius.