A method for manufacturing a shoe body with a foamed dual-layer midsole formed by supercritical foaming injection molding, wherein the shoe body comprises the foamed dual-layer midsole and an upper bonded to each other;
- the method comprising the steps of:
- step S1:
- providing a first midsole module, wherein the first midsole module comprises an upper mold and a first midsole mold;
- the upper mold comprises an upper mold cavity, wherein the upper, sleeved onto a shoe last, is pre-disposed in the upper mold cavity;
- the first midsole mold comprises a first midsole mold cavity and a plurality of first injection runners, wherein the first injection runners are connected to the first midsole mold cavity;
- step S2:
- sealing the first midsole mold to the upper mold to form a first midsole mold chamber defined by the upper mold cavity and the first midsole mold cavity, wherein the first injection runners are in communication with the first midsole mold chamber;
- step S3:
- injecting a first foaming material comprising a first supercritical fluid into the first midsole mold chamber through the first injection runners, so as to foam and mold the first foaming material to form a first foamed midsole layer, and to integrally bond the first foamed midsole layer to the upper;
- step S4:
- opening the upper mold and the first midsole mold, with the first foamed midsole layer and the upper remaining on the upper mold;
- a first bottom surface of the first foamed midsole layer comprises a plurality of foamed columns, wherein the foamed columns correspond to a plurality of positions of the first injection runners and are exposed from the upper mold cavity;
- step S5:
- trimming the first bottom surface of the first foamed midsole layer to remove the foamed columns on the first bottom surface;
- step S6:
- providing a second midsole module comprising a second midsole mold, wherein the second midsole mold comprises a second midsole mold cavity and a plurality of second injection runners, and the second injection runners are connected to the second midsole mold cavity;
- step S7:
- sealing the second midsole mold to the upper mold, with the first foamed midsole layer disposed on the upper mold, to form a second midsole mold chamber between the first foamed midsole layer and the second midsole mold cavity, wherein the second injection runners are in communication with the second midsole mold chamber;
- and
- step S8:
- injecting a second foaming material comprising a second supercritical fluid into the second midsole mold chamber through the second injection runners, so as to foam and mold the second foaming material to form a second foamed midsole layer, and to integrally bond the second foamed midsole layer to the first bottom surface of the first foamed midsole layer;
- the first foamed midsole layer and the second foamed midsole layer together form the foamed dual-layer midsole, thereby obtaining the shoe body.