| 摘要 |
PURPOSE:To enable to perform a molding, in which a sinking is prevented from occurring to a projection molding part, by means of a simple and inexpensive mold, by a method wherein, after a molded work body is molded by an injection molding, a projection is injection-molded by means of a different injection mold. CONSTITUTION:A molded work body 1, molded by a separate injection mold, is placed on a cavity mold 8, a core mold 7 and a runner plate 9 are lowered from above, synthetic resin, being compatible to the molded work body 1, is injected in a cavity space formed in the core mold 7 through a gate 5 from a runner 6 in a manner to clamp a part in the proximity of the projection molding part of the body 1 to produce bosses 2a and 2b forming a prjection. If, after cooling, the runner plate 9 is raised, a part between the gate 5 and the runner 6 is torn off by a pin 13, if the core mold 7 is further raised, a synthetic resin molded work, in which the molded work body 1 and the bosses 2a and 2b are monolithically united together, is removed by means of an extruding pin. |
