Abstract: A process for manufacturing moldings of plastic material includes successive cycles of conveying a succession of mobile molding tool parts independently of each other along lateral and vertical guideways of a conveyor to a work station holding a basic molding tool part.

Abstract: A highly efficient and highly controllable method and an apparatus for core-back injection molding of multi-component plastic products. Core-back injection molding makes possible the injection of a first plastic material into a mold cavity, followed by retracting a barrier means, in order to enable injection of a second plastic material without separating any mold halves. The present invention enables very efficient injection molding because both injection units may be operated at the time, and the present invention enables very controlled injection because it is possible to inject only one half of the cavities by a specific injection unit at the same time, or even only one quarter of the cavities by a specific injection unit at the same time. The injection molding apparatus includes a first injection unit, a second injection unit, a right adjustable mold cavity with a first moveable barring means, a left adjustable mold cavity with a second moveable barring means, and a common standard clamping unit.

Abstract: A system and method of controlling hold pressure applied to molding cavities of a stacked multi-parting injection molding system having desynchronized injection periods while cyclic injection molding a plastic material. A combination of the center molding block and an injection system together provide an adjustable feed system. The feed system is adjusted to enable plastic material to be fed from the injection system through a left branch to the left molding cavity. The injection system is pressurized to inject the plastic material through the left branch to fill the left molding cavity. The injected plastic material is confined within the left branch and the left molding cavity; and the confined plastic material is hold pressurized by a movable packing element. A like sequence of steps is followed to hold pressurize the right molding cavity.

Abstract: A multi-cavity injection mold, for simultaneously injection molding a plurality of multi-layer articles, having a single hot runner manifold system for the sequential supply of first and second molten molding materials to the cavities of the mold with each of the materials being supplied simultaneously to all cavities in equal quantities. The invention also provides a core rod for each cavity in which a concavity is provided, adjacent the entry point of the materials into the cavity, to prevent the first injected material in an injection cycle from being washed from the end of the core rod by the second injected material, a buffer of the first injected material in the neck region of the preform to compensate for variations in temperature of the cavities and material being distributed to different parts of the mold and the use of the first part of the metered quantity of the first to be injected material from the next injection cycle to seal the preform at the end of the injection cycle.

Abstract: An injection molding apparatus and process for forming a plurality of first parts and a plurality of complementary second parts during a single molding cycle has a system for removing parts molded during each cycle and for assembling the parts into finished articles. The system includes a plurality of rotatable suction cups for removing the parts and for aligning them with and inserting them into a series of loading ports in a central mold member so as to mate respective ones of the first parts with respective ones of the second parts. The central mold member further has internal chute assemblies for conveying assembled articles away from the mold. A novel system for driving the rotatable suction cups uses a rotatable member mounted to various mold halves and a camming arrangement whereby relative movement of the mold halves during the mold closing and opening motions causes rotation of the suction cups.

Abstract: A compression molding apparatus for forming a plastic grip ring and simultaneously linking it integrally to a linking protruding piece of a container closure body. The apparatus includes a mold composed of a first mold portion and a second mold portion adapted to be opened or closed by being moved relative to each other in a predetermined direction. The first mold portion has an accommodating space for receiving the closure body and a first mold cavity extending in a ring-like shape. At least the free end portion of the linking protruding piece of the closure body to be received in the accommodating space is projected into the first mold cavity. The second mold portion has a main part consisting of a second mold cavity extending in a ring-like shape and a conduit hole extending in said predetermining direction from the second mold cavity and a compression rod to be slidably inserted into the conduit hole.

Abstract: An apparatus for producing molded articles attached to a flexible web by molding the articles in the cavity of a mold which includes entrances for the web and means for centering the web in the cavity. Elements are provided to trim waste from the molded article and automatically advance the web upon opening of the cavity. Elements are provided to separate articles with a predetermined length of web material attached.

Abstract: A system and method of controlling hold pressure to cooling cavities when cyclic injection molding a thermoplastic material by utilizing a combination of a multi-parting mold system and an injection unit which together encompass a bifurcated feed system with a molten core. The mold system includes a center part that joins end parts at parting surfaces to define first and second cooling cavities. The feed system is defined by the injection unit and the center part and includes a runner orifice from the injection unit and bifurcated branches. A valve is located in the runner orifice. The first branch feeds injected thermoplastic material to the first cooling cavity, and the second branch feeds injected thermoplastic material to the second cooling cavity. The valve is closed each time after molten thermoplastic material is separately injected under pressure into each of the cooling cavities to hold pressurize the plastic material in the respective cooling cavities.

Abstract: A nozzle assembly for mounting on a cold runner block has a cooled housing with a bore and a nozzle member with a shaft portion mounted in the bore for rotation about a bore axis. A cap portion of the nozzle member is connected to the shaft portion and has a surface for positioning close to the mold surface of a mold member. A mold cavity in the mold member has a mold orifice in the mold surface for alignment with a nozzle opening in the surface of the cap portion. The nozzle opening is positioned radially outward from the bore axis and is rotatable into alignment with the mold orifice upon rotation of the nozzle member. A nozzle passage extends from the nozzle opening to the bore for communicating a fluid molding material to the mold cavity. A spring device may be disposed between the housing and the nozzle member to urge the surface of the nozzle member towards the mold surface. A ball member with a flat sealing surface may be mounted in a spherical recess in the surface of the cap portion.

Abstract: A stack molding apparatus wherein the injection nozzles are disposed in pairs of coaxial nozzles in a housing between two sets of injection molds. The reciprocable valving elements of the injection nozzles of each pair are coaxial with each other and are connected with pistons which are reciprocable by compressed air. The pistons are mounted in cylinders of discrete melt supplying members which receive melt from an additional melt supplying member. The housing has two mirror symmetrical sections which can be parted in a plane between pairs of coaxial pistons to afford access to the melt supplying members, to the pistons, to the nozzles and to a device which serves to supply compressed air for reciprocation of the pistons.

Abstract: A method and apparatus for injection molding thermoplastic material including a stack mold and an injection unit with a movable sprue bar communicating with the runner system. The sprue bar is releasably engaged with the runner system by relative movement in a direction perpendicular to the horizontal central axis of the stack mold.

Abstract: An injection molding machine for the making of barrels of syringes has first and second mold sections which have confronting surfaces and one of which is movable between operative and retracted positions in which the surfaces respectively abut and are spaced apart from each other. The first section has cylindrical bores each of which is open at the respective surface and extends to an end wall adjacent a nozzle with several uniformly distributed orifices which admit heated plasticized material into the bore when the two surfaces abut. The second section has cores each of which extends into a bore in the operative position of the one section to define with the first section a cavity for reception of plasticized material. The first section has coolant-conveying channels which concentrically surround the bores, and the first section has flow restricting ports which connect the discharge ends of the orifices with the respective cavities.

Abstract: As injection molding machine in which a plurality of stationary molds (29) are securely disposed in a row on a stationary platen (3) and transversely extending parallel to one another, and a moving mold (6) to be coupled with the stationary molds is supported as a unit displaceable in a lateral direction in a mold holder with regard to a moving platen (4), by coupling and clamping the moving mold (6) and one of a plurality of stationary molds (29) together, injection molding is accomplished, thus by changing stationary molds one after another and clamping the moving mold, the injection molding is accomplished to obtain multi-colored or multi-material molded products. The moving mold protrudes a small distance beyond the end surface of the mold holder facing the stationary mold to minimize flash produced by slanting due to off-center pressure on the molds.

Abstract: An injection molding heated manifold having a melt passage with a longitudinal portion to convey melt from a molding machine to a number of different nozzles. The steel manifold has a pair of cooling bores extending parallel to and equally spaced on opposite sides of the longitudinal portion of the melt channel. A cooling fluid, such as air, flows through the cooling bores to quickly cool the manifold after the system is shut down to minimize deterioration of the melt in the melt channel. The air flows helically around spiral vanes which are mounted in the cooling bores to avoid temperature stratification along the melt passage.

Abstract: A press for molding thermoplastic, thermosetting, polyurethane polymeric articles includes three workstations arranged side by side and including a central molding station and two lateral stations for cooling and extracting molded articles. Two molds are rigidly connected to one another and controlled by a transfer pusher which alternately moves the molds from the molding station to either of the cooling and extraction stations. A first presser at the central molding station applies a closure pressure necessary for the material injection, while auxiliary presser arranged in each station applies a reduced secondary pressure to the molds at the end of the injection step, during the translatory motion of the mold and during the cooling step.

Abstract: A resin encapsulating apparatus for semiconductor devices is characterized by including a rectangular pot constituted by being surrounded with two opposed wall surfaces of short side each having an outwardly projecting curved surface and two opposed wall surfaces of long side which are each substantially in the form of a straight line; a plurality of cavity lines connected respectively through gates to the bottom portion of at least one said long-side wall surface of the pot, the cavity lines each consisting of cavities connected in series; and a plunger to be inserted into the pot.

Abstract: Apparatus operative to reduce molten plastic drool when the injection unit is separated from the runner system. The apparatus includes access means for closing the runner system when the injection unit is disengaged therefrom and for opening the runner system for engagement with the injection unit, wherein the injection unit is operative to move the access means away from the runner system for engagement of the injection unit with the runner system.

Abstract: An injection molding machine including an injection unit and a central movable platen supporting exterior manifold sections communicating with mold halves. The mold halves are clamped along a first axis and the injection unit is clamped to the platen along a second axis generally perpendicular to the first axis.

Abstract: An injection molding system having at least one insulation gate seal extending outwardly to bridge an insulative air space between a heated nozzle and the adjacent cooled cavity plate. Each seal has a central bore therethrough to convey pressurized melt from the nozzle to the aligned gate. The outer end of each seal has a circular groove extending between a central portion and a surrounding flange portion. The flange portion is substantially larger in diameter than the gate and extends outwardly past the face of the central portion into sealing contact around the gate against the surrounding surface of the cavity plate. The combination of the clearance provided between the face of the central portion and the surrounding surface of the cavity plate and the distance between the gate and the surrounding flange portion limits the temperature of the cavity plate immediately around the gate, while still providing the necessary seal.

Abstract: A cold runner block (38) has spaced drop holes (54) arranged in a selected pattern for supplying fluid molding material to nozzles (60) connected to the mold gates (62). The drop holes (54) open on nozzle runners (52) in the cold runner block (38) which are in communication with a source of fluid molding material. Close-off rods (68) are selectively positioned in the runners (52) to block the flow of fluid molding material beyond the drop holes (54) communicating with a mold (12) for an object of a particular size and shape. Drop hole plugs (66) are provided for the drop holes (54) which open on the nozzle runners (52) in the section of the runners (52) not blocked by the close-off rods (68).

Abstract: The present invention relates to a device for removing workpieces from a wide variety of injection molding machines, particularly stack mold machines. The device includes at least one suction cup for grasping and rotating each workpiece through an approximate 90.degree. arc from a position intermediate the mold portions to a position outboard of the mold portions. The suction cup(s) are mounted to a rotatable shaft which is actauted by a cam-operated linkage assembly.

Abstract: Injection molding halves for forming disks having a plurality of cavities between a stationary mold unit, in which a plurality of sprue bushings and a runner with gates for introducing molten resin into said plurality of cavities are provided, and a movable mold unit in which a plurality of punches are provided concentrically to the sprue bushings for severing a central aperture of the molded disk, and an interval mechanism for providing a predetermined interval between a stationary mold unit and stationary mold base plate to ease the removal of escaped material, and connecting structure for connecting the stationary mold unit and the stationary mold base plate by alternative rotating of a connecting rod.

Abstract: A system and method of cyclic injection molding a plastic material by controlling hold pressure and transferring plastic material to molding cavities of a stacked multi-parting injection molding system having desynchronized injection periods. The system includes left, left center, center, right center and right molding blocks disposed for movement with respect to each other along a common axis; and defining a left molding cavity between the left and the left center molding blocks, a left center molding cavity between the left center and the center molding blocks, a right center molding cavity between the center and the right center molding blocks, and a right molding cavity between the right center and the right molding blocks.

Abstract: An apparatus for injection molding of plastic lure skirts utilizes an openable mold wherein a conic cavity is formed between a pair of mold plates and a conic insert is selectively advanced to abut the inner surface of the conic cavity. A plurality of grooves are formed in the conic cavity which communicates with a tubular section wherein the soft plastic is introduced such that a body portion and a stranded skirt are formed when plastic is injected between the mold plates and the conic insert. The apparatus may be used for forming double skirted lures or conventional non-skirted lures by internal injection when a stripper bar is used to partially seal the mold distribution channel.

Abstract: An injection molding apparatus for high pressure injection molding of thermoplastic materials reduces counteractive deformation of desynchronously filled coaxially located molded cavities. The apparatus includes a clamping apparatus having left, center and right molding blocks for movement with respect to each along a common axis and defining first and second molding cavities. The center block includes left and right platens separated by a multitude of supporting columns. At least one of the columns is at least partly positioned above a first horizontal plane which is located at least 30% of a distance from the axis to a top of the platens and at least one of the columns is at lest partly positioned below a second horizontal plane which is located at least 30% of a distance from the axis to a bottom of the platens. Columns are similarly positioned in relation to first and second vertical planes.

Abstract: A manifold assembly of the type used for conveying plastic injection molding material from a central injection point or sprue to a number of mold cavities or to multiple points within one large mold cavity. The assembly includes an integral manifold and a plurality of nozzles extending radially outward therefrom. Insulating rings are disposed about the nozzles for inhibiting heat transfer between the nozzle and the core or cavity and a stainless steel locating ring is disposed between the sprue and a support member, which supports the assembly. The locating ring inhibits heat transfer from the sprue to the support member. Aluminum plugs are disposed at the terminal ends of the manifold and inhibit heat transfer from the terminal ends. Preload pads are removably secured to the manifold radially opposite the nozzles for insulating and supporting the manifold under pressure. Heater bands supply the heat to the assembly and the temperature of the plastic injection molding material is monitored by thermocouples.

Abstract: Thin-walled elongated tubular products are individually formed utilizing injection molding of a plastic melt into a mold cavity having an elongated core pin maintained in substantially centered relation on the interior thereof through the application of tension continuously being applied coaxially to the core pin. Multi-unit or mass production techniques include use of a plurality of mold cavities each successively subjected to receiving a hot plastic melt injection wherein the resulting formed product is, through successive steps, removed from the mold cavity, trimmed, separated from the core pin, and possibly further processed for depositing in collection facilities or transferred to other processing steps.

Abstract: Chocolate mold filling apparatus having chocolate molds having different number of cavity, cavity volume, cavity fill opening height, and cavity fill opening spacing characteristics. Each mold further has a base flange which incorporates a process code keyed to the mold different characteristics. A sensor detects the base flange process codes and controls a connected conveyor, chocolate metering pump, and chocolate mold fill tube.

Abstract: A method, system and device utilized therein for the injection molding of plastic articles of enhanced surface quality using pressurized fluid. The fluid is prevented from contaminating the molten resin in the nozzle from which it was injected to thereby eliminate splay. The method involves the initial step of injecting molten resin at a nominal injection pressure from the nozzle of an injection molding machine through a resin injection aperture at an upstream position in a mold. The resin travels along a resin flow path in the mold to a mold cavity defining the shape of the molded article at a downstream position. The device at least partially defines the resin flow path in the mold. A charge of fluid pressurized at a predetermined level is communicated to the resin flow path through an orifice in the device which opens to the resin flow path.

Abstract: An investment casting wax injection machine includes a heater for heating wax. A cylinder with a piston is disposed in the container which is disposed beside the working table. A discharge pipe connects the heater and the container for supplying the melted wax from the heater to the container. A disc is fixed at a bottom end of the cylinder. A number of check valves are provided on the piston and the disc. A distributor with a nozzle is disposed on the cylinder, and a check valve is provided between the distributor and the cylinder. A number of cooling manifolds are distributed in the distributor for cooling the wax.

Abstract: A multi-cavity valve gated injection molding system having an elongated manifold through which a melt passage to a number of heated nozzles. A separate valve member bushing is seated in an opening through the manifold in alignment with each nozzle. The bushing is in bearing contact between the back plate and the rear face of each nozzle. The bushing has a melt duct with two smoothly curved arms which connect between the melt passage in the manifold and the melt passage around the valve member. The bushing provides a seal around the reciprocating valve member and has an outer flange which forms a combination insulative air space and containment chamber for melt which does escape.

Abstract: Apparatus and method for molding a plurality of articles having various masses and shapes wherein a parison mass is injected at constant back pressure through a time controlled valve from a supply of molten molding material at predetermined temperature and pressure. The articles are compression molded at predetermined pressures in accordance with their shapes or masses. The variable compression pressures are provided in one embodiment by similar actuators which are unequally excited; and in another embodiment an actuator is coupled to a mold cavity by a machine having a variable mechanical advantage. The actuators are pivotally mounted. A series of lenses including negative powers is particularly contemplated.

Abstract: Method for coinjecting a plurality of thermoplastic materials to mold an article having a layered wall structure using thermoplastic material having different optimum processing temperatures including the maintenance of the optimum temperatures in flow paths individual to each material from its source to a mold cavity.

Abstract: A plurality of rotational members which comprise an inner shell and an outer shell rotatable relative to each other and in which a soluble film is fixed to the inner periphery or the outer periphery of one of the shells, the shell with the soluble film fixed thereto is the shaping mold of a molding machine for molding the other shell, and a plurality of rotational members comprising an inner shell and an outer shell are molded through the soluble film, whereafter the soluble film is dissolved and removed.

Abstract: A device for resin sealing semiconductor devices includes a pair of chase blocks having cavities for holding semiconductor devices, a press machine for pressing the chase blocks against each other through a pair of press surfaces, a plurality of support members for holding the chase blocks over the respective press surfaces of the press machine and undergoing elastic compressive deformation during the press operation of the press machine, and a plastic injector for injecting plastic into the cavities in the chase blocks.

Abstract: A device is disclosed which operates to receive and package automatically a plurality of articles molded cyclically and continuously by a high speed, high production injection molding machine where the articles are oriented, stacked or nested within a container in an orderly and antiseptic fashion.

Abstract: A plastic injection mold apparatus which includes a multiple tip torpedo heater in the fluid plastic flow passageway. The torpedo heater includes a pair of substantially identical tip members and a mounting collar which together define an exposed outer cylindrical surface of substantially uniform diameter with a tip at each end thereof over which the fluid plastic material may be directed at an elevated temperature. The tip members each are formed with an internal bore for receiving a respective electrical heating element, the leads of which exit the heater through the central mounting collar. The torpedo heater is retained in mounted position by means of a removable bushing, which permits relatively easy removal and replacement of the heater. The mounting collar and bushing each are formed so that an insulating air space is defined about their outer peripheries for enhancing the energy efficient operation of the molding operation.

Abstract: An apparatus for switching runners in an injection molding system of the type having cavities which are joined by runners, the apparatus having a bushing member which has a top end, a bottom end and a central aperture, the bottom end having at least two outwardly disposed runner extensions which are in flow communication with the central aperture and the cavity runners, a bushing insert which is sealingly and rotatably fitted within the central aperture of the bushing member and which has a bottom end having therein a runner extension device which is in flow communication with one of the runner extensions in the bushing member when the bushing insert is in one position and which is in flow communication with another runner extension in the bushing member when the bushing insert is in a second position; and an indexing member carried by the bushing insert and the bushing member for establishing a plurality of predeterined relative positions of the bushing insert relative to the bushing member.

Abstract: A plastic injection molding system having a plurality of multiple tip torpedo heaters which each have a casing with a pair of opposed tips disposed in respective sprue passageways in a mold. An unsheathed electrical heating element is disposed in an internal bore of the casing at each tip and heat transmitting material is compacted in the bore in surrounding relation to the heating element for electrically insulating each heating element from the casing and filling all air voids between the casing and heating element to effect direct heat transfer to the casing. Electrical leads couple the plurality of heating elements to a power source to permit independent temperature control of the individual heating elements and the exposed surfaces of the respective casing tips over which fluid plastic material is directed.

Abstract: A runnerless method for injecting and molding a synthetic resin through a gate wherein a molten resin is intermittently cooled to solidification using a cooling medium to close the door for every injecting and molding operation of a molten resin in the gate, and relates also to a novel runnerless apparatus for injecting and molding a synthetic resin provided with a metal mold mechanism composed of a plural number of component members, in which the passage for the molten resin including a runner, the gate, and a cavity are drilled, a cooling medium-employing intermittent cooling mechanism for intermittently cooling the gate thereby enabling solidification of the molten resin in the gate, a mechanism for continuously applying heat to the gate for melting an existing resin, and an injection mechanism.

Abstract: A stack injection molding system for conveying melt from an upstream heated nozzle seated in a fixed mold platen to an aligned downstream heated nozzle in a movable mold platen. The upstream dowstream nozzles each have a nose portion with a forward face which abuts against each other in the parting line in the closed position. The melt passage extends through aligned central melt bores in the nozzles which taper inwardly adjacent the forward faces to form a sprue gate where they join. While both nozzles have an integral electrical heating element, only the heating element of the upstream nozzle has a circular forward portion which is brazed in the nose portion to encircle the melt bore and provide more heat and better control adjacent the sprue gate. Before the mold is opened along the parting line for ejection during the injection cycle, power to the heating elements of the nozzles is turned off to avoid drooling of melt from the open sprue gate.

Abstract: The present invention provides in a stack mold with back to back centrally located mold cavities a multiple sprue bar arrangement including a pair of sprue bars balanced on opposite sides of the mold and connecting bridge across the sprue bars for interfacing to a plastic injector. At least one of the sprue bars provides a plastic flow path from the connecting bridge to the mold cavities.

Abstract: A manufacturing machine for sagged self-supporting cable includes a turntable and a drive member for imparting rotation to the turntable. Several die casting members include molds designed to selectively open and close. The die casting member are circumferentially mounted on the turntable. A mold assemblying member is provided for selectively opening and closing the molds. A sag adjusting device is mounted on the turntable for adjusting the position of a main cable so as to be longer between adjacent die cast members than a suspension wire. An injection device is disposed adjacent to a crimping point and moves synchronously with the die casting member for filling the mold cavity with the crimping material for securing the relative positioning of a main cable relative to a suspension wire.

Abstract: An apparatus for injection moulding plastics closure elements into apertures in the central panels of a plurality of can ends comprises a first mould tool, a second mould tool, and a mechanism for bringing the mould tools together to clamp on opposed surfaces of each central panel and thereby define a mould cavity enclosing a margin of panel material around the aperture and spanning both sides of the aperture. A passageway in at least one of the moulded tools permits injection of plastics material into the mould cavity. The first mould tool includes a plurality of cavity defining mould portions each slidably guided in a respective bore in the first mould tool and a resilient support in each bore to urge each mould portion towards the second mould tool. A stripper plate surrounds the mould inserts and is formed with an annular recess situated laterally outside of and around each insert to receive the outer circumference of a can end to properly locate the can end.

Abstract: An injection molding machine and method of operation having a plurality of accessory arrangements for molding a plurality of piece parts in efficient overlapping time cycle using primary and secondary molten plastic injection units, primary and secondary clamping units, a plurality of injection units in various arrays including molding piece parts in reverse or uniform orientation.

Abstract: An injection molding machine has a mold closing unit arranged on a machine bed and adapted to selectively receive a first type of mold assembly having a central injection opening or a second type of mold assembly having a non-central injection opening; a platform mounted on the machine bed; and an injection molding unit supported on the platform. The injection molding unit includes a carrier block; a plasticizing cylinder received in the carrier block and a feed screw received in the plasticizing cylinder. The injection molding unit is pivotal by a drive into a first working position in which the injection molding unit cooperates with a mold assembly of the first type or into a second working position in which the injection molding unit cooperates with a mold assembly of the second type. The platform has two parallel-spaced side plates which flank the carrier block.

Abstract: A multi-cavity mold in combination with a hot runner system wherein the hot runner system includes metering means individual to each mold cavity for feeding precisely measured quantities of thermoplastic material to each cavity.

Abstract: An apparatus for encapsulating selected portions of the printed circuit board in a pin grid array using transfer molding techniques. In one embodiment for encapsulating only the top surface and side edges of the board, a vacuum is provided in the lower cavity to hold the edges of the bottom surface of the board flush against the mold plate. In a second embodiment for encapsulating all exposed surfaces of the board, the array pins are inserted in holes in the bottom of the cavity and supported by an adjustable block which positions the board in the cavity.

Abstract: The present invention relates to an apparatus for producing molded plastic articles which is capable of simultaneously producing and cooling the plastic articles. The apparatus has a stationary mold half having at least one cavity, at least two mating mold portions, each having at least one core element, mounted to a movable carrier plate which aligns a first one of the mating mold portions with the stationary mold half and positions a second of the mating mold portions in a cooling position, a device for cooling the molded plastic article(s) when in the cooling position, and a device for moving the carrier plate along a first axis so that the aligned mold portion abuts the stationary mold half and the second mating mold portion simultaneously brings each plastic article(s) thereon into contact with the cooling device. The carrier plate is also rotatable about an axis parallel to the first axis to permit different ones of the mating mold portions to assume the aligned position during different molding cycles.

Abstract: An injection mold having a fixed mold member and a movable mold member, a sprue bushing assembly mounted in the fixed member containing an automatically actuated gate slidably mounted therein for opening and closing the sprue hole in response to the positioning of the mold members.