PURPOSE: To perform easily and attractively gate cutting, by a method wherein a sprue is provided in the rotary center, one side mold surface is divided into two of the inside and outside with a circle touching almost internally to an outline of a product and a gate is cut off by turning an inscribed circle part prior to mold breaking after injection molding.
CONSTITUTION: A divided surface side of a rotary mold 5 is divided into two of the inside and outside with a circle touching almost internally to an outline of a product, both of which are provided turnably to each other and a runner 55, side gate 502 and submarine gate which are extended radially from a sprue position are formed within an inscribed circular part 54. When the first time injection molding is completed, a rotary shaft is turned by an actuator, the inscribed circular part 54 of the rotary mold 5 is turned, the radial runner 55 and gate 502 are turned to registered mold parts each of a male and female mold parts, a female and male mold parts 51 and between the female mold parts 52, cut off from half-divided bodies and the product and after the gate 502 is cut off, a hollow product and the runner 55 are ejected. Gate cutting is easy and a cut surface is attractive.
NISHIDA SHOZO
DAIKYO INC
PURARIIDO KK