| 摘要 |
PROBLEM TO BE SOLVED: To adapt high pressure injection molding to the molding of a deep box such as a battery case in order to prevent filling inferiority. SOLUTION: A fixed mold 6 has a fixed template 11, a runner stripper plate 12 and a fixed attaching plate 13 all of which are opened and closed mutulaly. The bottom surface of a battery case is formed by the cavity core 14 fixed to the fixed attaching plate 13. A runner 27 of which the leading end part becomes a gate 28 is formed between the side surfaces in the mold opening and closing direction of the fixed template 11 and the cavity core 14. At first, molds are closed by weak mold clamping force to fill a cavity 8 with a resin in such a state that the runner stripper plate 12 and the fixed attaching plate 13 are slightly opened. Thereafter, mold clamping force is increased to close the runner stripper plate 12 and the fixed attaching plate 13. During this period, the resin in the cavity 8 returns to the runner 27 at first and, after the cavity core 14 closes the gate 28, the resin in the cavity 8 is compressed. |
