| 摘要 |
PROBLEM TO BE SOLVED: To prevent cobwebbing from occurring in a sprue when a resin substrate is molded by an injection molding machine. SOLUTION: A space 12 or the like is provided at a tip part of a nozzle 1 to thereby lower a heat transfer of the nozzle 1. Alternatively, either one of a projected spherical surface of the tip part of the nozzle 1 and a recessed spherical surface of a sprue bush 2 is projected, formed in the same spherical surface as a radius of curvature of another spherical surface to thereby bring the nozzle 1 into contact with the sprue bush 2, and a heat absorbed from the tip part of the nozzle 1 to the sprue bush 2 is increased. Thus, a temperature of the tip part of the nozzle 1 is made lowered easily. After the resin material injected in the cavity 11 for molding is cooled, disconnecting of the tip of the rod-like protrusion of the sprue when the sprue is taken out is upgraded. COPYRIGHT: (C)2004,JPO
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