| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sprue bush in which shortening of a molding cycle is attained by cooling efficiently a molten resin filled up in a sprue, and which is excellent in durability. <P>SOLUTION: The sprue bush includes: a sprue bush body 1 having a cooling water passages 9 and 10 at the perimeter of a sprue 4 located at the center; and a flange plate 2 located in the rear side of the sprue bush body 1, and is characterized in that these members are integrally joined by friction welding. A hard metal can be used, moreover, there is no fear of water leak. <P>COPYRIGHT: (C)2012,JPO&INPIT |
