Abstract: At least one mold is provided having a mold cavity and a mold gate communicating with the mold cavity, an injection nozzle for feeding molten plastic material to the injection mold having a nozzle outlet in line with the mold gate, and a thin movable valve gating arrangement positioned between the mold gate and nozzle outlet having an orifice therein permitting and shutting off flow of molten plastic from the nozzle to the mold.

Abstract: A drool control apparatus having a piston disposed in a melt passage of a mold. The piston is moveable between a bypass position, where pressurised melt is permitted to flow past the piston to at least one nozzle, and a compression position, where the melt downstream of the piston is decompressed to inhibit drool at the nozzle.

Abstract: A method of forming a number of air vent holes in a rear case of a liquid crystal flat plate display (LCD) monitor and an apparatus therefor. The method includes forming a number of air vent holes on an incline plane of the rear case using a first metal mold and a second metal mold, such that pin holes are formed in the first metal mold and protrusion pins are installed in the second mold so as to be respectively inserted into the pin holes, to form respective air vent holes. The molding is performed in a state that the protrusion pins are inserted into the respective pin holes during injection of a solution which forms the rear case.

Abstract: The present invention relates to a metal mold for producing a synthetic resin molded product, particularly a thermoplastic resin molded product, which is characterized by comprising: a first mold, a sliding mold that is allowed to slide over the entire outer circumferential face or on a portion of said first mold, a second mold having a parting face that is capable of contacting the face of the outer circumference of said sliding mold, and a mechanical clamping mechanism that makes the outer circumferential portion of the said sliding mold mechanically coupled to said second mold, wherein said sliding mold has a sliding direction that is the same as the opening and closing direction of the two molds, that is, the first mold and the second mold, and the sliding face between the first mold and the sliding mold is located inside the outer circumferential line, of a plane projection figure in the opening and closing direction of the metal mold, of a synthetic resin molded product which is molded by the metal mold

Abstract: In an injection molding machine, an apparatus for controlling movement of a pin comprising a plastic melt flow channel having an output end for delivering molten plastic injected into the channel under pressure to a mold cavity, wherein the pin comprises an elongated rod having an axis and an end, the pin being slidably mounted within the channel for movement along its axis within the channel, an electrically driven motor drivably interconnected to an actuating mechanism, wherein the actuating mechanism is drivably interconnected to the end of the pin, the motor being controllably drivable to drive the pin through movement along its axis within the channel

Abstract: A flash-free mold structure is designed for use in the molding of an encapsulant for encapsulating a semiconductor die. The flash-free mold structure includes a first molding piece and a second molding piece. The second molding piece is formed with a resin passage for an encapsulating material to flow therethrough during molding process. It is a characteristic feature of this flash-free mold structure that a cutaway portion, which can be either an one-step cutaway portion or a multi-step cutaway portion, is formed at the rim of the resin passage. The cutaway portion is dimensioned significantly smaller than the resin passage for the retarding the flow speed of the encapsulating material from the resin passage into the cutaway portion during the molding process, thereby preventing the encapsulating material from entering the fissure in the junction between the first and second molding pieces. The resin passage can be either a cull, a runner, or a subrunner defined by the first and second molding pieces.

Abstract: A method for molding by adjusting either the flow area to a constant size mold gate or the area of a variable mold gate opening in order to control the flow of molten plastic to a mold cavity for the injection molding of plastic parts, such adjustment being made by rotating an outer rotary gate bushing relative to an inner stationary hot sprue bushing which is surrounded by said outer rotary gate bushing. Also, a method is disclosed in which the gate operates without closure by means of metal parts. Rather, the frozen molding compound itself serves to close the gate between mold shots.

Abstract: The present invention relates to an apparatus for manufacturing a substantially flat article, such as a smart card, having at least one substantially flat edge. The apparatus includes a mold for forming the substantially flat article, which mold includes an inlet gate for allowing molten plastic material to flow into a cavity space defined by the mold. The apparatus further includes a source of molten plastic material, a passageway communicating with the inlet gate and the source of molten plastic material, and a blade or pin for pushing residual plastic material in the passageway into the cavity space formed so as to form a side edge for the substantially flat article having substantially no gate vestige. A method for manufacturing the substantially flat article is also described.

Abstract: A molding apparatus intended to produce a flush finished part without any gate tab. The apparatus has a gate selectively movable between a first position permitting flow of mold medium from the cold runner to enter the mold cavity and a second position blocking such flow, the gate in the second position fully filling the opening and having a surface exposed to the mold cavity which surface is flush with the interior wall to.

Abstract: A valve stem is mounted in a nozzle body, with the valve stem moving from an open position retracted from the injection orifice permitting the flow of resin to the mold cavity, to a closed position blocking the injection orifice and preventing the flow of resin to the mold cavity, and to an advanced position within the gate nub area to assist in the ejection of a molded part and clear the gate nub area.

Abstract: The method of resin molding is capable of preventing molded products from forming resin flash on their surfaces. The method comprises the steps of: covering over a parting face, of at least one of molding dies with release film; clamping a work piece, with the release film, by the molding dies; and filling the melted resin in the molding section of the molding die, wherein the release film is tightly pressed on a surface of a part of the work piece, which is exposed after molding, in the clamping step. By pressing the release film on the surface of the part of the work piece, the release film prevents the melted resin from invading into a gap between the release film and the work piece, so that no resin flash is formed on the surface of the work piece.