초록 ▼

A method for making an expanded sole, in which a blank is preliminarily molded as an unexpanded form in a preliminary mold and is then subjected to a product inspection, followed by a high temperature heating to undergo a reaction for expansion and cross-linking in a high-temperature mold, is disclo

A method for making an expanded sole, in which a blank is preliminarily molded as an unexpanded form in a preliminary mold and is then subjected to a product inspection, followed by a high temperature heating to undergo a reaction for expansion and cross-linking in a high-temperature mold, is disclosed. In the method, the unexpanded blank is formed with a thickness greater than and with a cross-section smaller than those of the mold cavity of the high-temperature mold via the preliminary mold, thus facilitating placement of the blank into the high-temperature mold and venting air easily from the high-temperature mold. In addition, the bottom surface and the lateral surfaces of the blank are formed with flutes via the preliminary mold so as to assist in ventilation during molding of the blank in the high temperature mold.

대표청구항 ▼

[ What I claim is:] [1.]1. A method for making an expanded sole in which a blank is preliminarily molded as an unexpanded form from a foamable molding composition in a preliminary mold having a sole-shaped mold cavity and is then subjected to a product inspection, followed by a high-temperature heat

[ What I claim is:] [1.]1. A method for making an expanded sole in which a blank is preliminarily molded as an unexpanded form from a foamable molding composition in a preliminary mold having a sole-shaped mold cavity and is then subjected to a product inspection, followed by a high-temperature heating to undergo a reaction for expansion and cross-linking in a high-temperature mold having a sole-shaped mold cavity, the method comprising:forming the unexpanded blank with a thickness greater than and with a cross-section smaller than those of the mold cavity of the high-temperature mold by providing the mold cavity of the preliminary mold with a height greater than and with an area smaller than those of the mold cavity of the high-temperature mold, thus facilitating placement of the blank into the high-temperature mold and venting air easily from the high-temperature mold, wherein the cross-section lies in a plane transverse to the thickness.