| 摘要 |
PROBLEM TO BE SOLVED: To perform gate seal without producing a thin layer part becoming a cause of cutter dust and to manufacture a high quality disk by balancing sprue inner pressure with advance pressure of a male cutter just before the male cutter is inserted into a female cutter when the gate seal is performed. SOLUTION: In the step of the gate seal performed just after molten resin is filled into a cavity C, the male cutter 22 is stopped on a position P just before the male cutter 22 is inserted into the female cutter 12. At this time, since the male cutter 22 is stopped by balancing the advance pressure of the male cutter 22 with the inner pressure of a sprue bush 11 when the male cutter 22 exists on the position P, the gate seal is performed regardless of the state that the male cutter 22 isn't overlapped the female cutter 12. Since the male cutter 22 isn't overlapped the female cutter 12 at the time of the gate seal, the thin layer part is not produced. |
