Mold for molding disk, having air passages for blowing compressed air to

Abstract

A mold for molding a disk substrate includes a stationary mold half having a first molding surface and a movable mold half having a second molding surface, which cooperate with each other to define therebetween a mold cavity. Each of at least one of the stationary and movable mold halves has at least one air supply passage for supplying compressed air, and a plurality of air blow passages having respective air inlets in communication with the at least one air supply passage and respective air outlets open to the mold cavity at respective circumferential positions of the mold cavity about a centerline of the mold, for introducing the compressed air from the air supply passage into the mold cavity, to facilitate removal of the molded substrate from the corresponding mold half or halves. The air supply passage and the air blow passages cooperate to provide a plurality of air passages ending at the air outlets which have a substantially same resistance to a flow of the compressed air therethrough.