Abstract: The thin molded article of the present invention includes a thin flat plate 1 and dam/discharge ribs 6 provided on the thin flat plate having a shape in which bar-type ribs having wide or large diameters extend radially from the center of the molded article. The tips of the bar-type ribs having wide or large diameters have a shape that allows the molten resin injected from a gate into a cast to be accumulated temporarily before it flows into said thin plate, thereby providing a configuration in which the tips of said ribs do not reach the outer edge of the molded article.

Abstract: A plastic product disclosed herein devises weight reduction by structuring the principal parts of the merchandise with plastic material, and at the same time, provides a structure that rivals the strength of iron in shelve boards and brackets or any other applications, and a structure for the mold thereof.

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 employs 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 directions. A passage groove formed on the net groove of the upper and/or lower molds has a large diameter or width to facilitate the entrance of the molten resin. At least one pin point gate is formed on the passage groove to inject the molten resin into the mold. A frame groove surrounds the net groove in the upper and/or lower molds.

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 employs 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 directions. A passage groove formed on the net groove of the upper and/or lower molds has a large diameter or width to facilitate the entrance of the molten resin. At least one pin point gate is formed on the passage groove to inject the molten resin into the mold. A frame groove surrounds the net groove in the upper and/or lower molds.

Abstract: A meshed plastic filter of a narrow-pitch net including a net and a frame in a unitary body is produced in either a square or a circular overall shape, and has diverse applications, such as a filter or sieve for gasoline or oil, a dust collector filter and other various filtration. A precision die has developed for producing such a meshed fabric plastic filter. The precision die has grooves called dam/discharge rib grooves radiating from the die center for guiding and pressuring the injected material and the vertical and horizontal rib grooves existing in horizontal and vertical directions for forming the net, so that gas retention inside the die is prevented and the material sneaks uniformly into the vertical and horizontal rib grooves and a frame groove through the dam/discharge rib grooves.

Abstract: A meshed plastic filter of a narrow-pitch net with a net structure and a frame structure formed in either a square or a circular overall shape into a plastic injection molded unitary body includes a dam/discharge rib in the net structure for storing molten plastic material and accumulating pressure of the molten plastic material, thereby enabling implementations of a fine-pitch net filter having mesh holes of 0.2 mm in diameter at a spacing of 0.3 mm, which has diverse applications, such as a filter or sieve for gasoline or oil, a dust collector filter and other various filtration.