Patent ID: 6139309
Filing Date: 2000-10-31
Classification: B29C,B29L

Abstract:
An injection molding apparatus for molding a plastic article by fitting an upper mold and a lower mold by pressing and injecting a molten resin through a pin point gate, comprising:(a) a net groove formed at the upper mold and/or the lower mold, said net groove comprising fine grooves extending in a vertical and/or horizontal direction, wherein the net groove at the upper and lower mold are formed in the same directions;(b) a passage groove having a large diameter or a large width, for facilitating the entrance of the molten resin, the passage groove being formed on the net groove of the upper mold and/or the lower mold;(c) at least one pin point gate formed on the passage groove to inject the molten resin into the mold, having a diameter of 1.5 .phi. or more to be suitable for a shape or size of the plastic article; and(d) a frame groove formed to surround the net groove in the upper mold and/or the lower mold.