| 摘要 |
PURPOSE:Not to leave any gate trace on the surface of a product and to make it possible to injection-molding the product, by providing a tunnel gate in a slide core and a molten resin storing part being a little thicker than an ejecter pin at the place where the slide core is moved in the moving direction of a projected pin. CONSTITUTION:When the parting face of a mold starts to open a little, the apex part of a sprue runner 5 has been already pulled apart from the apex part of tunnel gate 7. Moreover, a movable side mold plate 2 and a fixed side mold plate 1 move in parallel, the sprue runner 5 starts to release the mold while being bent. When the mold is completely opened, the slidecore 3 has been stopped by bringing in contact with a slide core stopping plate 23. The relation between the diameter d1 and the diameter d2 of the resin storing part in the slide core is set in such a way that d2 is designed to be a little thicker than d1 in taking the processing accuracy and the assembling accuracy of the mold into consideration. When projecting action is completed, the tunnel gate 7 is released from the mold while being bent in the slide core 3.
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