Abstract: An injection mold for forming a light guide plate including a first block, a second block configured to face the first block, a forming portion included between the first and second blocks facing each other and having a shape of the light guide plate, an injection portion formed at the first block and configured to receive injected resin for forming the light guide plate, and a gate portion configured to guide the injected resin from the injection portion to the forming portion. Further, a width of a first end portion of the gate portion that is connected to the forming portion is 50%-80% of a width of the forming portion.

Abstract: A mold assembly and method of operation utilizes a degater for separating plastic in runners and gates from a desired completed part prior to curing of the plastic material to provide desirable cut on completed part. Cutting edges of the degater are disposed proximate to the gates to trim excess plastic from a completed part prior to curing or hardening of the plastic part.

Abstract: A molding apparatus is configured with article molding regions that receive a direct flow of a molding material feed such that external flow channels are not needed. The article molding regions are formed into front sides of opposed “A” and “B” surface mold tools that, when moved into a mating relationship with one another, form closed molding cavities within which molded articles are generated from molding material feed. The article molding regions each generally have a body bounded by a perimeter that establishes an outer edge for an article molded in the one of the closed molding cavities. With at least the “A” surface mold tool, a port is coupled with the body of each article molding region to establish a direct pathway is through which the molding material feed flows to enter the article molding regions, and thus the closed molding cavity, without having to flow along the tool front sides outside of the article molding regions.

Abstract: A method of making shaped articles from highly condensed polyester melt and especially preforms for the blow molding of food and especially beverage containers. A melt is continuously withdrawn from the polycondensation reactor and is fed to the shape-imparting units, especially a multiplicity of injection-molding machines without solidification between the final reactor and the injection molders and without degassing between the final reactor and the injection molding machines.

Abstract: The present invention relates to an injection molding process that improves recovery limited productivity. The present invention advantageously applies pressurized fluid within the nozzle of an injection molding machine to improve the machine's productivity. In accordance with one aspect of the invention, an existing or new injection molding machine is outfitted with a pressurized fluid system at the nozzle between the plasticizer barrel and the melt manifold. The use of a specialized nozzle and isolation valve allows the pressurized fluid to displace material within the nozzle and runner, ensuring the proper pressure is applied to the plastic resin within the mold during pack and hold while the plasticizing screw can begin its recovery cycle. Finally, the pressurized fluid can be evacuated from the nozzle melt stream area either via the fluid entrance or a fluid pin.

Abstract: An apparatus for injection molding includes at least one mold part having at least one surface. The mold part has at least one shaped portion. At least one substantially closed cavity region is disposed within the at least one surface. The one cavity region is designed for molding at least part of an interstitial mass. The apparatus further includes at least one gate disposed on the at least one surface for providing fluid communication to the at least one cavity region and at least one flow restrictor positioned on the mold part for initially directing flow of the interstitial mass to the at least one shaped portion. In one embodiment, flow restrictors initially direct the interstitial mass to an upper portion of the shaped portion.

Abstract: A mold for molding an optical element, in particular using a reaction injection molding method (RIM). The mold comprises a generally circular shaped, mold cavity having a geometrical center and a main plane, a sprue base with a longitudinal axis and a feed connection that makes the sprue base communicate with a feed sill of the mold cavity, the longitudinal axis of the sprue base and the geometrical center of the mold cavity defining a mold symmetry plane orthogonal to the main plane of the mold cavity, which intersection with said main plane defines a mold main axis, characterized in that the longitudinal axis of the sprue base together with a line perpendicular to the main plane of the mold cavity forms an angle ranging from 0 to 30°, preferably from 0 to 15°. Methods of using the mold and objects made thereby are also disclosed.

Abstract: An encapsulation technique for leadless semiconductor packages entails: (a) attaching a plurality of dice (411) to die pads in cavities (41-45, 51-55) of a leadframe, the cavities arranged in a matrix of columns and rows; (b) electrically connecting the dice to a plurality of conducting portions (412-414) of the leadframe; and (c) longitudinally injecting molding material into the cavities along the columns via a plurality of longitudinal gates (46-49, 56-59) of the leadframe to package the dice in the cavities, the longitudinal gates situated between the cavities along the columns.

Abstract: Provided is a mold clamping apparatus of a mold having a side wall portion of cantilever shape, by which deformation of the mold side wall portion can be efficiently suppressed. An injection molding machine and injection molding method both using the mold clamping apparatus are also provided. Thereby, molded articles with high quality having no flash generation can be obtained. The mold clamping apparatus comprises a side pusher comprising a pair of supports respectively arranged between adjacent two tie bars out of a plurality of tie bars at positions symmetrical to each other and slidably supported to the tie bars, a moving and positioning means linking the supports to a fixed platen or movable platen and moving the supports to be positioned at a predetermined position and a lateral clamping means provided on each of the pair of supports to push a side face of a fixed mold or movable mold.

Abstract: An injection molding apparatus includes a valve support structure having an internal channel for directing a flow of melted resin to a mold cavity. A first valve actuator is supported by the valve support structure and is operatively connected to a valve stem. The valve stem extends at least partially through the internal channel through a valve aperture. A bushing is fitted in the valve aperture. A second valve actuator is located adjacent the first valve actuator. The second valve actuator is operatively connected to a sleeve member with a hollow interior dimensioned to slidingly engage the valve stem and an exterior surface dimensioned for sliding movement in the bushing. The second valve actuator selectively moves the sleeve member between a retracted position where the sleeve member moves toward the bushing and an extended position where the sleeve moves away from of the bushing.

Abstract: The valve includes: a body in which is formed a flow passage for the material to be molded having a constriction bounded on its upstream side by a change of section forming a seat, and a needle mounted in the body and having a closure shoulder adapted to bear in the closure position against the seat formed by the change of section in the flow passage in the body, so as to shut off the flow passage and, projecting from the closure shoulder, an opening adjustment tip that has a nonuniform section and is engaged in the constriction to define a certain flow section therewith in each intermediate position of the needle.

Abstract: An injection molded plastic rod suitable for use in a battery hydrometer. Stress-relieving formations are provided symmetrically arranged on opposite sides of an injection gate of the rod. The formations distribute injection stresses and shield the gate vestige.

Abstract: An injection molding apparatus comprises a manifold having a manifold channel for receiving a melt stream of moldable material under pressure and delivering the melt stream to a nozzle channel of a nozzle. A mold cavity is in communication with the nozzle channel of the nozzle and receives melt through a mold gate. A valve pin is axially movable through the nozzle channel of the nozzle to selectively open the mold gate. The mold gate is open when the valve pin is in an extended position and a portion of the valve pin is received in the mold cavity. At least one groove is provided in an outer surface of the valve pin and at least a portion of the outer surface of the valve pin is in continuous engagement with the mold gate to align the valve pin relative to the mold gate. When the valve pin is in the extended position, the groove is aligned with the mold gate to allow melt to flow between the nozzle channel and the mold cavity.

Abstract: An improved injection molding apparatus having a valve-gated injection nozzle for regulating a flow of molten material through a connecting passageway to a mold cavity. An end portion of the valve stem is configured to cooperate with a complementary sealing portion of the connecting passageway, when the valve stem is configured in a closed position. The mold cavity further includes a vestige forming portion that is located adjacent the sealing portion that is partially defined by a bottom portion of the valve stem when it is configured in the closed position. The apparatus is characterized in that the vestige forming portion extends radially outwardly from the sealing portion such that a first cross-sectional area of the sealing portion is smaller than a second cross-sectional area of the vestige forming portion. Accordingly, tearing along the vestige of the part is substantially avoided.

Abstract: Systems, methods and apparatuses for manufacturing dosage forms, and to dosage forms made using such systems, methods and apparatuses are provided. Novel compression, thermal cycle molding, and thermal setting molding modules are disclosed. One or more of such modules may be linked, preferably via novel transfer device, into an overall system for making dosage forms.

Abstract: A closing element, which has an open position and a closed position and is actuated by an actuating element, is arranged in the nozzle channel of a nozzle body. In the closing position, the closing element separates a region that is at least temporarily in open communication with the injection mold, the region being able to be influenced by a second actuating element associated with the nozzle body. Due to the fact that the pressure element is arranged in the nozzle body and can be actuated independently from the nozzle body and the plastifying cylinder, a nozzle body is created and a method is provided that enable the dosing process and dwell pressure process to be separated with a compact structure.

Abstract: An improved injection molding apparatus for a mold using a valve-gated nozzle that includes a replaceable insert with a bore for aligning and sealing with the valve stem. The replaceable insert is advantageously provided as a wear component in a gate insert.

Abstract: An assembly disposed within a mold for forming openings in a plastic part includes a punch pin and a backing pin having faces disposed flush with a surface of a mold cavity. The backing pin is disposed opposite the punch pin. The punch pin is driven into the completed plastic part removing material to form an opening. The waste material is driven into a bore housing the backing pin. The backing pin recedes into the bore to accept the waste material. Upon ejection of the plastic part the waste material ejects from the mold cavity as the backing pin moves back to a position flush with the surface of the mold cavity.

Abstract: Method and apparatus for molding a sealing surface of revolution on a molded part in first and second partable mold halves that mate at a major parting line plane. First and second mold inserts each have a sub-insert trim wheel component shaped to mold form the sealing surface of revolution when closed at a minor parting line plane. The sub-inserts are rotatable between a position flush with the major parting line plane and a starting position angularly offset therefrom. The mold cavity is filled with liquid molding material that is allowed to harden to at least a self-sustaining solidification strength. The sub-inserts are then rotated to thereby move any minor parting line flash toward a position angularly offset from their starting position. This rotation causes any parting line flash that might otherwise remain on the sealing surface to be removed from attachment to, and/or smeared smooth along, such surface.

Abstract: A multi-material runner gate system allows effective de-gating of elastomeric materials that would otherwise stretch and/or flex reducing de-gating forces at the gate upon separation of the molds.

Abstract: A method for producing a multilayer molded article having good feeling of touch without giving damages on a skin material at the vicinity of gate portions by fushion-bonding integrally a skin material to a core material using a horizontal mold clamping type injection molding machine which comprises steps of closing a movable mold so that a mold interval between the movable mold and a fixed mold is set to a predetermined distance after the skin material is set up in the cavity of a mold, starting injection and filling-up of a resin melt for a core material into the cavity of mold, retracting the movable mold with progress of injection and filling-up until the mold interval becomes a predetermined distance after lapse of a predetermined time from the start of injection, and clamping the mold again after the completion of the injecting.

Abstract: An injection molding method and device, wherein, in order to minimize dimension errors of molded products, molten resin is injected from a nozzle (23) retaining therein pre-pressurized molten resin such as plastic into the cavity (3) via an annular gate (24).

Abstract: A valve bushing assembly for use in an injection molding apparatus is provided. The injection molding apparatus includes a manifold block, a valve pin, and an actuator block. The manifold block has at least one melt channel therein. The manifold block has an exterior surface that faces the actuator block, and has a manifold pass-through extending from the exterior surface to the at least one melt channel. The manifold pass-through has a manifold sealing surface therein. The manifold pass-through permits the valve pin to pass therethrough. The actuator block has an actuator attached thereto, that is operatively connected to the valve pin. The valve bushing assembly includes a bushing and a spacer. The bushing is adapted to be received in the manifold pass-through. The bushing has a bushing pass-through that is adapted to align with the manifold pass-through and is adapted to slidably receive the valve pin.

Abstract: An injection nozzle for plastic injection moulding equipment having a nozzle tip (4) with an internal hollow element (5) made of a material with high thermal conductivity, and an external hollow element (6) made of a material with a lower thermal conductivity. The internal hollow element (5) is connected to the body (1) of the injector nozzle independently with respect to the external hollow element (6), and a space of mutual separation (19) is defined between the internal and external hollow elements (5, 6).

Abstract: A valve pin assembly for an injection molding apparatus comprising a valve pin capable of movement up and down in a nozzle to open and close a ring gate. An annular passage is created through the nozzle and is unobstructed and without restriction at all points up to and through the ring gate, permitting melt to flow freely to the gate and, depending on the position of the valve pin, into the mold cavity. The valve pin has a head with a diameter larger than the valve pin shaft for selectively closing the gate. The ring gate channel diameter is larger than the melt channel diameter to permit parts with large apertures therein to be formed.

Abstract: A cylindrical concrete receiver 10 is caused to project from a top section 3 of a body section 11 forming a frame 2. When concrete 5 is filled in the body section 11, part of the concrete 5 is caused to overflow inside the concrete receiver 10 and then, pressure is applied to the concrete 5 overflowed in the concrete receiver 10 by a weight 12.

Abstract: The invention provides a boots for a resin constant velocity universal joint in which a different thickness portion is integrally formed in an inner diameter of a large diameter side end portion of a primarily molded resin bellows in accordance with a secondary molding. A resin bellows (8) constituted by a bellows portion (55), and a small diameter side end portion (40) and a large diameter side end portion (41) which are provided in both end sides of the bellows portion (55) is molded in accordance with a primary molding, and a different thickness portion (56) corresponding to a secondarily molded product is integrally formed in an inner periphery of the large diameter aide end portion (41) of the primarily molded resin bellows (8) by being secondarily molded within an injection metal mold (64). At this time, a molten material of the different thickness portion (56) is injected into a secondary molding space from an optional position of a thin portion.

Abstract: A plunger rod for a syringe in is of integrally injection molded plastic construction having an elongated body with a coaxial end portion. An external thread extends around the end portion for threaded receipt into a plunger tip that is slidably received in a syringe barrel. A flat extends chordally across the end portion of the rod body interrupting the external thread. The plastic, of which the plunger rod is molded, is gated into the mold for the plunger rod at the flat that extends across the rod end portion, leaving a gate mark or vestige on the flat. Gating of the plastic material into the portion of the mold that forms the threaded end portion of the plunger rod achieves improved flow and improved filling of the external thread, while employing a simple and economical mold construction. The gate vestige does not interfere with threading of the plunger rod end portion into the plunger tip.

Abstract: Solid rollers of a urethane material are formed in closed mold formed by a tube and two end plugs spaced by a shaft, the latter becoming the shaft for the roller. The closed mold avoids rough grinding to a cylindrical shape, as well as avoiding the resulting waste of material and introduction of defects that arise from rough grinding. The formation of bubbles during injection of the urethane material is avoided by filling the closed mold with carbon dioxide gas prior to injection. The formation of gate marks in the urethane material is avoided by repositioning the end caps after injection to separate the injection gate from the cylindrical cavity. The need to trim the ends of the roller is avoided by providing an annular cavity between the top end cap and the tube that receives excess urethane material to be drawn into the cylindrical cavity as the urethane shrinks during curing.

Abstract: An injection mold is provided for injection molding an encapsulation material to encapsulate at least one integrated circuit chip. The injection mold includes at least two parts that define at least one injection circuit, and at least one blind complementary channel communicating with the injection circuit. The injection circuit includes at least one injection cavity for housing the chip, at least one transfer chamber from which the encapsulation material is injected, and at least one injection channel connecting the transfer chamber to the injection cavity. The blind complementary channel is formed between the two parts of the mold and forms at least one appendage of encapsulation material that is connected to the encapsulation material that fills the injection circuit. Also provided is a method for injection molding an encapsulation material to encapsulate at least one integrated circuit chip.

Abstract: The present invention relates to an in-mold gate opening and closing mechanism in which it is easy to adjust the gate balance, more specially, in an in-mold gate opening and closing mechanism, in which a gate pin disposed in a gate in a mold is moved in line with resin pressure in the gate, the gate is opened by the gate pin escaping from the gate when the resin pressure exceeds an appointed pressure level when filling resin, and the gate is closed by the gate pin moving the gate direction when the resin pressure is lowered from the appointed pressure level when a filling of the resin is completed, wherein the gate is opened by a gate pin escaping from the gate when the resin pressure exceeds a pressing force of a spring adjusted by a mechanism for adjusting the spring pressure when filling resin.

Abstract: An apparatus and method for producing a sheet of brake lining material utilizes a mold which has a mold base and a mold frame. The mold frame is slidingly received on the mold base. The sliding relationship between the mold frame and the mold base results in a mold cavity which has a variable volume. The variable volume of the mold cavity allows the cavity to adjust to the size of material initially placed in the mold cavity thereby eliminating any mold flash and/or scrap material.

Abstract: Method and apparatus for forming an article from a molten plasticized resin using an injection molding machine by (a) forming a mold cavity having a first region for producing a molded part and a second, distinctive region for receiving a plasticised resin; (b) injecting into the second region a volume of plasticized resin for the article to be formed in the first region of the mold cavity; (c) applying pressure to plasticized resin to move it at least in part from the second region to the first region; and (d) maintaining pressure on the plasticised resin in the first region until the article is formed and stresses are relieved.

Abstract: Injector (1) for injection molding of plastic materials, comprising a body (2, 6) and a passage for running hot plastic material into the mold, an axially mobile pin (7) in the body (2, 6) for controlling said passage and a linear actuator (8) for controlling the movement of the pin (7) between an advanced closed position of said passage and a retracted open position of said passage. The injector (1) is equipped with a pressure sensor (13) detecting the pressure inside the mold, which is operative associated to said pin (7).

Abstract: A mold runner for a runner or sprue type injection molding apparatus. The mold runner allows the passage of a substrate material from an injection source into a mold cavity and contains a containment shroud which utilizes the relative incompressibility of the substrate material in the containment shroud which prevents an in-mold coating, which is injected into the mold cavity in a subsequent step, from flowing into the injection substrate source thereby contaminating the same.

Abstract: An injection molding nozzle tip has a particular arrangement of geometries that allow a sharp &Dgr;t point to be effected at a transition section between a heat sink area (adjacent to an external mold) and a heated reservoir that contains molten resin. The high temperature differential at the &Dgr;t point is effective to remove stringing and drooling for a wide range of materials and nozzle sizes.

Abstract: A valve pin actuator is disclosed that includes a cylinder mounted to the clamping plate, a piston slidably mounted in the cylinder, and a valve pin assembly carried by the piston. A hydraulic or pneumatic circuit is provided for controlling the movement of the piston, and in turn translation of the valve pin between the seated and unseated positions. The valve pin assembly includes a first part removably secured to the piston so as to translate therewith, and a second part for receiving the valve pin and secured to said manifold. The actuator assembly enables removal of the clamping plate without removal of the valve pin assembly, and also adjusting of the valve pin without removal of the clamping plate. The assembly further provides a clearance between the piston and valve pin assembly, to accommodate expansion and movement of the manifold that would otherwise cause a side load to be exerted on the valve pin.

Abstract: A mold for packaging an integrated semiconductor device includes two half shells closing on a perimeter dam bar of a die-stamped assembly metal frame of a semiconductor die that is between the two half shells of the mold. A depressed central pad of the metal frame defines, at least along an injection zone of the resin, a slit between the perimeter portion of the metal frame and the central pad. Resin flows through an inlet channel of the mold and through the slit to fill the upper and lower cavities. An edge of the central pad defining the slit is bent upward to form a spoiler intercepting the resin stream so that part of the resin is directed toward the lower cavity. The inner edge of the upper half shell of the mold defining the internal cavity along the injection side of the resin is inwardly offset.

Abstract: The present process includes a mold for producing a thermoplastic resin molded article, comprising paired sliding female and male mold members, which mutually slide at the time of mold closing. A product-forming portion and a non-product-forming portion are provided in the cavity of the mold, the mold further including a resin-supplying opening. A gate portion located at a boundary between the product-forming portion and non-product-forming portion interconnects the two portions. At closing of the mold, the width of the gate at the product-forming side is less than the thickness of the formed product, and stepwise or continuously widens toward the non-product-forming side. Using this mold, a thermoplastic resin molded article, with or without a laminated skin material, can be molded in good efficiency and low cost, further having a non-product-forming portion, which can be readily trimmed from the product-forming portion.

Abstract: A manufacturing method for a resin product comprised of a plurality of separate pieces and having a flange, the plurality of separate pieces including one as a separate piece having a flange corresponding to the flange of the resin product, comprises primary-injection-molding the plurality of separate pieces including the separate piece having the flange by a primary injection of a resin, and having respective separate planes of the plurality of separate pieces in abutment, joining the separate pieces together to mold the resin product having the flange by a secondary injection of a welding resin. When molding the plurality of separate pieces including the separate piece having the flange by the primary injection of the resin, a gate part for molding the flange of the separate piece having the flange is positioned inside the flange.

Abstract: A nonslip member in which a large number of nonslip convexes are fixed to an upper surface of a base fabric performing an anchoring action, and the nonslip convexes are made of rubber. By engaging a male mold and a female mold with each other, a large number of small pieces coincident to a shape of through holes of the female mold are punched out from a plate-like material. By pressurizing and heating each small piece between a punching convex and a mounting base while engaging the male mold and the female mold with each other, the small piece is bridged and fixed to the base fabric to serve as a nonslip convex.

Abstract: A process for forming an end cap in an extruded ceramic tube. An end cap forming cavity of an end cap forming die is positioned so that, when the body of the end cap forming die is situated against an extrusion die, ceramic material is able to be forced into the end cap forming cavity, through a passageway communicating between the end cap forming cavity and a backfill reservoir, and into the backfill reservoir. A plunger projects into the backfill reservoir to force the ceramic material from the backfill reservoir back through the passageway and into the end cap forming cavity to compact the ceramic material so that the ceramic material within the end cap will be provided with a substantially uniform density.

Abstract: A valve pin actuating mechanism including a valve pin guiding element for connection to a valve pin, a linkage element and an actuator. The valve pin guiding element has a sliding surface for sliding within a channel, and first and second engagement surfaces. The linkage element has first and second arms, which have opposing, inwardly facing arcuate engagement surfaces for engaging the valve pin guiding element. The linkage element is moved by the actuator.

Abstract: Method and apparatus for molding a sealing surface of revolution on a molded part in first and second partable mold halves that mate at a major parting line plane. First and second mold inserts each have a sub-insert trim wheel component shaped to mold form the sealing surface of revolution when closed at a minor parting line plane. The sub-inserts are rotatable between a position flush with the major parting line plane and a starting position angularly offset therefrom. The mold cavity is filled with liquid molding material that is allowed to harden to at least a self-sustaining solidification strength. The sub-inserts are then rotated to thereby move any minor parting line flash toward a position angularly offset from their starting position. This rotation causes any parting line flash that might otherwise remain on the sealing surface to be removed from attachment to, and/or smeared smooth along, such surface.

Abstract: A mill blank assembly for making a dental prosthesis includes a milling section and a support section. The support section is adapted to fit in a chuck or collet of a milling machine. One of the milling section and the support section includes a projection that extends into a recess of the other, in order to enhance the strength of the bond between the milling section and the support section. As a result, the completed assembly is less likely to fracture or become disassembled during the milling process.

Abstract: A system for injection moulding of large plastics components in a single shot comprises an extruder and an accumulator fed from the extruder The accumulator leads into the mould (14) via a mould valve (12) opive, when closed, to close the mould cavity substantially at the mould surface and also to close an outlet (20a) from the accumulator. The valve passage of the mould valve is of relatively large cross-section, typically several centimetres or more which facilitates injection at relatively low pressures and also facilitates passage of stones and other particulate matter which may be present if the extrudate is composed of post-consumer recycled plastics.

Abstract: An improved injection molding runnerless manifold and nozzle system, method and apparatus in which the fluid plastic molding material transfer conduits, such as the manifold runner channels and cavity injection nozzle passageway, are constructed of a low thermal conductivity, non-metallic heat insulation structural material to thereby heat insulate the liquified molding material or resin, whether thermosetting or thermoplastic, while resident in the manifold runners and/or nozzle passageways. The heat transfer and other physical parameters of the conduit material and structure are such that this molding material remains at a reasonable uncured molding temperature while resident in the transfer conduit for the duration of at least one injection cycle due to the heat insulation characteristics of these fluid flow conduits of the system.

Abstract: A gate to mold a primary spool of an ignition coil device is placed at a part which does not oppose a main part of a secondary coil in the primary spool, that is, at a part other than a coil winding portion. It is preferred to use a resin having a high dielectric withstanding voltage and a high flowability, such as polybutylene terephthalate (PBT) or polyethylene terephthalate (PET), polyphenylene oxide (PPO)/polystyrene (PS), or liquid crystal polymer. By arranging the gate except at the winding portion, resin deterioration or cracks occur only at a part which does not oppose the secondary coil, that is, at a part where a high voltage from the secondary coil is relatively low. An adequate dielectric withstanding voltage is ensured without winding an insulation tape around the winding portion.

Abstract: The invention relates to a method for injection molding a plastic molded part in an injection mold, comprising a) injecting a specified amount of plastic melt into the injection mold; b) introducing a compressed fluid between a part of the wall of the injection mold and the injected plastic melt; c) allowing the plastic melt to cool until the plastic molded part is self-supporting; and d) removing the plastic molded part from the mold. The invention specifies that, during or after step a) and during or before step b), the cavity of the injection mold is sealed against the environment, preferably by activating at least one seal.

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.