| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold for molding prisms at a low cost with no molding defects such as flashes and flow marks, in addition, capable of shortening the cooling period by permitting a stationary side cavity or a movable side cavity and a planar part to be changeable in a sliding manner within the mold. SOLUTION: The movable side core 13 Is withdrawn rightward by the command of a control device 15 and the planar part 20a is allowed to correspond with the P.L. surface by forcing the dammy core 20 upward, thus, only the stationary side cavity communicates to the runner 17. Following this, a primary molding is effected by injecting molten resin into the stationary side cavity 5a, so that a primary molded item is obtained by cooling and curing it. Then, as the dammy core 20 is moved downward and the movable core 13 is slid leftward, the position of the stational side cavity 5a and the position of the movable side cavity 13a correspond with each other. On the next place, a secondary molding is executed by injecting molten resin into the movable side cavity 13a. In this operation, it is joined to be integrated with the primary molded item in the stationary side cavity 5a, resulting in the formation of a prism. |
