Method for manufacturing a double-layer foamed sole

A method for manufacturing a double-layer foamed sole, comprising steps of:

• a. opening a mold composed of an upper mold section, a middle mold section and a lower mold section, the middle mold section being disposed between the upper and lower mold sections, the upper mold section and the middle mold section defining therebetween an upper mold cavity, the middle mold section and the lower mold section defining therebetween a lower mold cavity;
• b. respectively placing two different kinds of foam materials into the upper mold cavity and lower mold cavity and then closing the mold, the two kinds of foam materials having equal foaming magnification;
• c. heating the mold to foam and mold the different foam materials in the upper mold cavity and the lower mold cavity into an upper layer of the sole and a lower layer of the sole;
• d. opening the mold and removing the middle mold section and then mating the upper mold section with the lower mold section, whereby the upper layer and the lower layer are attached to each other to form the sole with a clear boundary between the upper and lower layers;
• e. secondarily heating the sole up to 150° C.˜180° C. and maturing the sole, whereby the different foam materials are combined into an integral body;
• and
• f. totally opening the mold to have the product of the sole.