INJECTION MOLD INJECTION MOLD COATED WITH PLASTIC TUNNEL AND THE TUNNEL GATE GATE STRUCTURE THAT IMPROVES THE SEPARATION OF

摘要

The present invention relates to a plating type injection mold having a tunnel gate structure which improves separation between an injection molded product and a tunnel gate resin. More particularly, the plating type injection mold (10) has a tunnel gate structure for molding an injection molded product from a molten resin injected from an injection molding machine and then filling a cavity (11) by way of a sprue (11), runner (120) and a gate (131) connected to the runner (120). In the plating type injection mold, the portion connected to the cavity of the gate (131) is formed to have a broad area on its plane and a narrow gap between the upper part and lower part, a joint molding portion (140) is formed so that the portion between the runner (120) and the gate (131) is formed to have a broad area on its plane and a narrow gap between the upper part and lower part, and a heating member (200) adjacent to the tunnel gate (100) is installed at one side inside the mold (10). Thus, the plating type injection mold has a simple structure and maintains unique purposes of a plating type injection mold. In addition, the amount of the molten resin supplied from the injection molding machine is the same. Further, generation of dust (b) is inhibited after molding to maintain productivity and to reduce defects upon plating. The heating member (200) allows the tunnel gate resin (20) to have softness so that the resin is bent to one side upon demolding and allowed to slide inside the gate (131). Thus, demolding is carried out naturally to avoid dust generation and rapid demolding provides improved work efficiency.