| 摘要 |
PURPOSE:To contrive to reduce the molding time of a product and moreover not to generate uncured part or unfilled part by providing the upper and lower bolsters supporting a mold and a plurality of heaters in the guide block guiding a plunger. CONSTITUTION:Top and bottom forces 20, 32 are respectively heated always at uniform temperature by the heaters 26, 34 in upper and lower bolsters 19, 31. A plunger 24 is being heated by the heater 27 in a guide block 22 also when it is upper part except during resin extrusion. The resin having begun to melt on cull 35 is pressed lowering the plunger 24, and when the resin is molded, pressure-transferring the resin to a mold cavity by way of main and subrunners 36, 37 and a gate 38, the resin is fully heated, because each mold is uniformly heated. The resin is the mold cavity, each runner and the cull, etc. reaches a specified thermal hardness after a constant time, and the resin curing finishes after air has been extracted sufficiently from the mold cavity. Accordingly, a molded product may be surely taken out without its deformation and breakage when the molds are opened. |
