| 摘要 |
PURPOSE:To improve slide characteristics of each plunger and enhance the durability of a resin-sealing mold assembly by applying required oscillation action to each plunger and/or each pot. CONSTITUTION:When a screw shaft moves up, the top end part 1202 of each plunger pressurizes a resin material R in each pot 114, respectively. However, when the applied pressure reaches a preset fixed level or above, each plunger 120 in upward movement moves down relatively with respect to a plunger holder 140. Since upward elasticity is applied to each plunger 120 by an elastic pressing member 121 via a seating 122, the respective resin materials R are subjected to a substantially equal pressure due to the elasticity. Furthermore, since each resin material R is heated by a heater to be melted in each pot 114 and is injected to be packed into a twin type cavity 116 through a resin passage 115 under pressure applied by each plunger 120, the molten resin materials injected and packed are molded to seal electronic parts in the twin type cavity 116. |
