Patent ID: 8662875
Filing Date: 2014-03-04
Classification: B29C,B29D

Abstract:
1. An injection foam molding apparatus for manufacturing a one-piece shoe or sole having various colors, hardnesses and specific gravities, using ethylene-vinyl acetate (EVA) ethylene-poly olefin compounds and thermoplastic resins, the apparatus comprising: a top mold including a molding space having a shape corresponding to an upper part of a shoe or sole; a bottom mold including a molding space having a shape corresponding to a lower part of the shoe or sole; a middle mold configured to be located between the top mold and the bottom mold and to separate the two molding spaces of the top mold and bottom mold from each other; a resin supply unit configured to supply different thermoplastic resins into the molding space defined between the top mold and the middle mold and the molding space defined between the middle mold and the bottom mold, respectively; a transfer unit configured to a pressing unit configured to press the thermoplastic resins charged in the molding spaces by moving the top mold downward and bottom mold upward, wherein wherein the top mold comprises a moving core for forming an inner shape of the shoe, wherein the moving core is moveable upward and downward in the molding space of the top mold, and the moving core is coupled with a spring for biasing the moving core downward, wherein the transfer unit is further configured to wherein the moving core comprises a rod-shaped moving member which is integrally provided on an upper portion of the moving core and is coupled to the spring, and the moving member is inserted into a through-hole formed in an upper portion of the top mold, wherein the moving member is configured to move upward and downward along the through-hole in the top mold, and the moving core is configured to move upward and downward integrally with the moving member.