| 摘要 |
PURPOSE:To prevent the generation of resin flashes, adhered to the side surface of a sheet member, and contrive the reduction of molding cost by a method wherein a resin reservoir, forming a side surface as one part of an inner surface, is provided along the side surface of the sheet member. CONSTITUTION:The gap (w) of the degree of 0.1mm, which is provided between the inside surface of an insert zone 5 for a mold and the side surface of a lead frame A, is formed as a resin reservoir 8 provided with a large sectional area. The resin reservoir 8 is connected to a gate 7 in the this mold, therefore, resin flows into the resin reservoir 8 when molding resin is cast into cavities 3, 4. Accordingly, the resin which flows into the resin reservoir 8 forms a resin reservoir section E, attached to the side surface of the lead frame A of a molded form taken out of the mold. When a flow passageway section D is removed from the molded form, the resin reservoir section E is removed together with the flow passageway D since a connecting strength between the resin reservoir section E and the flow passageway section D as well as the strength of the resin reservoir section E itself are stronger than an adhering strength between the resin reservoir section E and the flow passageway section D, therefore, the molding resin will never remain on the side surface of the lead frame A. |
