| 摘要 |
PROBLEM TO BE SOLVED: To eliminate air to be involved in molten metal and to prevent aforementioned air from mixing inside a cavity. SOLUTION: In the second runner part 24, a contracting part 26, the first expanding room 28, a filter room 30 and the second expanding room 32 are installed. In the upper part of the aforementioned first expanding room 28, a filter room 30 and second expanding room 32, from the first to third air bleeders 34, 38 and 40 are communicating each other. |
