Abstract: A high pressure multi-cavity injection molding system has an adjustable overflow cavity on each of the first to fill cavities. The volume of the overflow cavity is remotely adjustable without removing the overflow cavity from the system. In a mold system including a family of molds, the overflow cavities are sized so that the first to fill cavity(ies) and the overflow cavity(ies) fill at substantially the same pressure and time as the last to fill cavity. A looped gate passage is used to automatically sever the molded plastic at an edge of the cavities when the mold is opened. The looped gate passage does not constrict the flow of plastic into the cavities during the molding process.

Abstract: The apparatus is for molding an article of elastomeric material which has circular symmetry and is open at both ends, particularly for the production of protective bellows for vehicles. The apparatus comprises a die comprising an outer portion and an inner portion between which a molding cavity and an injection region are defined. The article of elastomeric material which is formed in the molding cavity remains anchored to the die portion after the outer die portion has been opened. Before the article is removed automatically from the inner die portion, a waste cap formed by the material which solidifies in the injection region is removed by means of a member.

Abstract: A device for encapsulating a plurality of semiconductor die comprises a form having first and second halves such that as the first half contacts the second half the first and second halves have a plurality of cavities therein. The first and second halves each comprise a conduit therein for receiving a heated liquid. The device further comprises a runner block having a hole therein, a separate runner for each cavity, and a conduit therein for receiving a heated liquid. The runners have a rectangular cross section and a width to height ratio of at least 3:1. The device further comprises a mounting plate for mating with the runner block. The mounting plate comprises a concave recess and a hole in the mounting plate at the recess. The hole in the mounting plate passes through the mounting plate to align with the hole in the runner block such that an encapsulation material can be passed between the mounting plate and the runner block.

Abstract: An unloader-separator attached to a die casting machine which includes a swing arm having grippers to hold the gate having components thereon. The swing arm holding the gate is rotated to a second position. A punch platen pushes the components through openings in the window platen which corresponds with the components on the gate. The swing arm releases the gate remnants for recycling, rotates to the first position and the cycle repeats. A link arm connects the swing arm to a cam unit which controls the rotation of the swing arm to a cam unit which controls the rotation of the swing arm. The cam unit also provides overload protection.

Abstract: A device for removing runners from intermediate molded products includes a holding assembly for maintaining the products in a desired position, a hammer member, an assembly for vibrating the hammer member to cause repeated striking of the intermediate product so as to separate runner and product portions thereof and a control arrangement for selectively activating and deactivating the vibrating assembly. The control arrangement provides for positioning the vibrating assembly in at least one predetermined position upon deactivation thereof so as to enable the vibrating assembly to be readily restarted. The holding assembly can incorporate a robot arm for transporting and positioning the intermediate molded product for runner removal. In order to protect the robot arm from the effects of vibrational forces, the intermediate molded product is adapted to be resiliently attached to the robot arm.

Abstract: An improved method for forming a disc substrate having a bottomed centering hole for rotating and driving the disc. The method includes injecting synthetic resin into a mold cavity formed by a first and second metal molds to form the substrate, and punching at least part of the centering hole by a movable member protruded into the mold cavity to form a through-hole. A stamper containing digital information is held in place inside the mold cavity by its inner circumference by means of a vacuum or a magnet.

Abstract: A method of forming end stops to a continuous slide fastener chain including element-free space portions at longitudinally spaced intervals, wherein as the chain is fed in the backward direction, a pair of rows of interengaged coupling elements extending on the downstream side of an element-free space portion is spread open by a chain splitting apparatus for subsequent molding of a separable end stop whereas a pair of rows of coupling elements on the upstream side of the element-free space portion is kept in engaged condition. After the separable end stop is molded, the chain is fed in the forward direction during which time a sprue portion and gate portions formed integrally with the separable end stop are caught by a chain splitting member of the chain splitting apparatus. The chain splitting member is then lowered to automatically remove the sprue portion and gate portions from the separable end stop.

Abstract: A local pressurizing type injection molding apparatus including a stationary die, a movable die disposed for movement into and out of contact with the stationary diet a first local pressurizing pin extending through the movable die and having a tip facing a gate, and a second local pressurizing pin extending through the movable die and having a tip facing the cavity. The apparatus is further provided with first advancing mechanism for advancing the first local pressurizing pin, second advancing mechanism for advancing the second local pressurizing pint and a device for individually setting the points in time at which advancing movements of the first local pressurizing pin and the second local pressurizing pin are started and for individually setting the pressurizing pressures given by the first local pressurizing pin and the second local pressurizing pin.

Abstract: The present intention intends to operate an ejector which carries out gate cut and product ejection in an injection molding machine, at optimal speeds, respectively. According to the present invention, a control unit for controlling hydraulic or electric drive means for operating one or more than one ejector pin comprises operation speed setting means for gate cut and another operation speed setting means for product ejection. Such a structure enables to carry out gate cut by operating an ejector unit controlled by an ejector unit operation speed setting means for a gate cut and, subsequently, to carry out a product ejection from metallic molds by operating the ejector unit controlled by another ejector unit operation speed setting means for product ejection. The ejector unit is set at a comparatively high operation speed for gate cut so that no gate trace will remain, and at a comparatively low operation speed for product ejection so that no cracks will be generated in the product.

Abstract: Apparatus for removing flash from a flexible molded part includes a support for supporting the part being deflashed in underlying relation with first and second pinch rollers which are located at opposite ends of the part, and first and second conveyor assemblies associated with the first and second pinch rollers, respectively, are adapted to move the flash at both ends of the part into engagement with the pinch rollers which are driven in opposite directions and have knurled surfaces, causing the flash to be pinched between the pinch rollers and the associated conveyor assemblies, pulling the flash from said part, the conveyor assemblies conveying the flash away from part.

Abstract: To provide a resin molding method and apparatus that may realize a sprue runnerless system with a very simple structure and at a low cost, a molten resin 4 is fed from a resin supply portion 1 into a pair of cavities 3 through a resin passages 2 such as a sprue portion 2A and a pair of runner portion 2B for molding the resin. The method includes the following steps of: moving a resin return member 5 toward the resin supply portion 1 after supplying the molten resin 4 into the cavities 3, the resin return member 5 being disposed so as to be projectable into the resin passage 2 and movable through the resin passage 2; and returning a waste molded resin 6 under a molten/solid condition within the resin passage 2 back into the resin supply portion 1 under a molten condition by a heat of the resin supply portion 1.

Abstract: An improved method of removing a stuck sprue from the ejector assembly of an injection molding machine and a tool for use in the method in which the tool has a body with a hollow lower portion having a bottom edge with peripherally spaced indentations, In the method, the tool is first heated to above the melting point of the molding material and the lower end is inserted into the stuck sprue. The tool is cooled to below the melting point of the molding material and then rocked back and forth to free the sprue from the ejector mechanism.

Abstract: A method and apparatus for separating an injection molded product from a sprue/runner formed with the injection molded product in injection molds includes a product receiver underlying the injection molds for receiving the product after the molds have been opened and a sprue/runner receiver underlying the injection molds for receiving the sprue/runners after the molds have been opened. The product receiver and the sprue/runner receiver are positioned relative to the molds and relative to each other such that the product falls onto the product receiver while being precluded from falling into the sprue/runner receiver and the sprue/runners fall into the sprue/runner receiver while being precluded from falling onto the product receiver.

Abstract: An apparatus and method for degating an injection mold high aspect ratio injection mold plastic article includes a pair of spring biased mold inserts locatable against opposed sides of a runner following initial mold opening movement and wherein one of the pair of mold inserts has a cutting edge and a first operative position engageable with the part following solidification thereof for supporting the part within the mold along an edge portion thereof that is joined to the runner; and wherein the other of the pair of mold inserts has a cutting edge that cooperates with the cutting edge of the one mold insert following mold opening to cut the runner from the part during the ejection of the solidified part.

Abstract: A method and apparatus for injection molding a plastic part using a film gate. The film gate is constructed of a pair of tenon members which retract into a mortise tooled into a mold section. Because the tenon members extend to release the dross formed in the runner, the film gate may be placed in the center of the mold section to decrease the pressure gradient in the curing plastic and to allow the gate to be located where aesthetic aberrations, from the removal of the dross, will not be a problem in the finished article.

Abstract: A plurality of small-sized recesses are provided along outer peripheral edges of the openings of semispheric recessed portions in which a golf ball is injection-molded. These small-sized recesses form small-sized positioning juts along the parting line of a golf ball intended to be injection-molded.

Abstract: An improved method of removing a stuck sprue from the ejector assembly of an injection molding machine and a tool for use in the method in which the tool has a body with a hollow lower portion having a bottom edge with peripherally spaced indentations. In the method, the tool is first heated to above the melting point of the molding material and the lower end is inserted into the stuck sprue. The tool is cooled to below the melting point of the molding material and then rocked back and forth to free the sprue from the ejector mechanism.

Abstract: A metal mold for sealing a semiconductor device with a resin and including a shutter gate mechanism. The mold drives a shutter gate pin by using the ejection stroke of a conventional seal press, and therefore eliminates the need for an extra drive source. It follows that the mold can be implemented only if an existing facility is slightly modified, and it is lower in cost than conventional metal molds.

Abstract: A sprue and valve assembly (22) delivers a curable liquid material to a mold cavity (26) and thereafter is easily cleaned of the cured residual core (52) remaining from the liquid material. A sprue (34) having a flow passage (36) extends between the exterior surface of a mold (24) and a runner (30) in the mold (24). A valve body (54) is connected to the exterior face of the sprue (34). A coin slide type closure element (56) within the valve body (54) is controlled by a lever mechanism to selectively open or close the flow passage (36) to the curable liquid material flow. The flow passage (36) is tapered to permit easy removal of the cured residual core (52). PTFE seals (74) are disposed on opposite sides of the closure element (56). A bayonet fitting permits quick connection and disconnection of a supply line (18) to the valve body (54).

Abstract: A method for preparing an elastic roller having a layer of elastic material disposed about and integrally molded to a shaft-shaped core metal member, includes the steps of disposing a cylindrical molding device for holding the elastic material, coating the core metal member with an adhesive, and mounting first and second lid members at opposite ends of the molding device. Each lid member holds a respective end of the core metal member so that the core metal member is disposed concentrically within said molding device. A sealing rubber is disposed between each lid member and the core metal member to prevent elastic material from entering a bearing portion of the core metal member, and the elastic material is injected into the molding device. The elastic material is cured, and the lid members are removed such that an extending portion of each lid member removes burrs formed at peripheral end portions of the roller.

Abstract: A method for manufacturing multilayer molded articles of at least two plastics material components having substantially different properties with respect to behavior, processing and/or temperature changes. The plastics material components are injected from different extruder unit through a common sprue brushing into a mold cavity of a molding tool. The plastics material components are introduced in a predetermined time sequence initially into different cross-sectional areas of a common sprue cone and are subsequently forced into the sprue cone in a converging manner toward a sprue duct of the sprue bushing.

Abstract: A protective glove for the electrical industry is produced by the injection molding process by injecting plastic material into an injection mold from two opposite sides via a sprue flange. This sprue flange is cut off from the protective glove after the latter is removed from the mold.

Abstract: In production of synthetic plastic molded parts, a sprue part is separated from the molded part by one displacing slider which cooperates with one limiting surface and displaces a sprue film from a sprue gap between a sprue passage and a mold nest, while an overflow part is separated from the molded part by another displacing slider which cooperates with another limiting member and displaces an overflow film from an overflow gap between the mold nest and an overflow passage.

Abstract: The present invention is an apparatus for segregating desired parts of predetermined dimension from a jumbled flow of such parts and by-product runners. The apparatus includes structure that defines a path for restricting the jumbled flow to a fixed-flow space along a flow length. The apparatus comprises a three-dimensional array of rotatable pickup fingers substantially filling the fixed-flow space and extending therebeyond. The apparatus further includes a suitable device for continuously moving successive distal portions of the rotatable finger array out of and into the fixed-flow space. The rotatable fingers are spaced apart by distances greater than the predetermined dimensions of the desired parts but less than the longest dimension of the runners, for capturing the runners while allowing the desired parts to pass through the pick-finger array.

Abstract: A injection molded part of thermoplastic material, in particular an information carrier disk, is produced by cutting and removal of a sprue part from the injection molded part. The sprue removal leaves an opening in the injection molded part. In order to obtain a clean and smooth opening surface with a fit diameter that is as accurate as possible, the sprue part is axially offset relative to the injection molded part so that the integral connection between these two parts extends only over a part of the opening. The diameter of the axially projecting part is equal to or larger than the diameter of the opening and the rest of the opening being produced by injection molding. The dimensions are advantageously chosen so that a parting edge inclined at an angle of 45.degree. to the plane of the opening is formed and that the injection molded part amounts to 70% and the part to be separated to 30% of the length of the open. The injection molded length of the opening may also be variable.

Abstract: A sprue part is cut and removed from the injection mold part during the manufacture of information storage disks by an injection molding process. The highly sensitive molding of an information storage disk is protected from damage by the sprue and the deposition of dust particles during stripping by this process. The sprue is punched into a part serving as the die of the injection molding tool and subsequently removed, in particular by suction, through an orifice leading from inside the part, together with the dust particles generated in the punching process. Preferably, the sprue is punched out and removed with the injection molding tool closed. The injection molding tool must be opened only after the sprue and the dust have already been removed, thus ensuring that the molded product has an especially good quality.

Abstract: An apparatus is disclosed for selectively separating runners and molded products from an injection mold assembly. The apparatus comprises first and second mold portions having mating surfaces formed to define a runner channel and product cavity. A plurality of ejector pins are disposed within the second mold portion and adapted to translate within the second mold portion so as to retractably extend into the cavities for forming the runner and molded product. An ejector plate assembly is provided which translates the ejector pins a predetermined distance within the mold. A pin extension mechanism is connected to the ejector plate assembly and at least one ejector pin. The pin extension mechanism is adapted to selectively extend the connected ejector pin a predetermined distance beyond the stroke of the ejector plate assembly such that the connected pin is extended into contact with the channels for forming the runner, or the molded product.

Abstract: In order to mold a plurality of articles (20--20) which are disposed in a line, a molding arrangement in an apparatus (60) includes a plurality of cavities (109--109) which are spaced equidistantly from an infeed sprue (131). A primary network of a distribution system (50) through which an injection molding material is flowed from the infeed sprue to cavity gates (151--151) is disposed substantially along a vertical plane (150). Afterwards the injection molding material which has been flowed from the primary network and along a secondary network into the cavities is solidified. Then the primary network is exposed by causing wedge blocks (79--79) to be disengaged from each other and from an adjacent stationary platen (62) and cavity plate (90) by movement of each block in a direction transverse to the plane.

Abstract: A runner structure composed of a runner and a sprue is discharged from an injection molding machine into a chopping apparatus having a first cutter mechanism and a second cutter mechanism. The runner structure is guided by a guide mechanism in the chopping apparatus toward the first and second cutter mechanisms. The sprue is cut off from the runner by the first cutter mechanism, and then the runner and the sprue are chopped by the second cutter mechanism. The first cutter mechanism has a lower cutter for stopping the runner structure by engagement with the sprue, and an upper cutter movable into coaction with the lower cutter for cutting off the sprue. The second cutter mechanism includes a feed roller for feeding the runner intermittently and a cutter reciprocably movable for chopping the runner on the feed roller. The chopped pieces are discharged through a hopper and delivered into the injection molding machine for recycling.

Abstract: The disclosure is of a tab-pulling device comprising a simple dovetail slide that grips a tab of a blow molded object between it and a planar, stationary jaw. As the tab-pulling jaw moves downward, a plunger or pusher finger carried thereon is projected outward to strip the tab from the movable jaw.

Abstract: A process of producing a moulding by introducing thermoplastics material into a mould space through gate means having a passageway, which process includes the formation of a sprue in the passageway. A retractable member cuts off the sprue before the material solidifies and closes the passageway at its junction with the mould space, the sprue being subsequently ejected from the passageway of the gate means before the next moulding cycle. A holder provides the gate means and the retractable member which is preferably inclined to the passageway. The gate means may also provide air ejecting means for removing the sprue and may conveniently be bolted onto an otherwise conventional injection moulding machine. The retractable member may incorporate a feed pipe for injecting a fluid into the plastics material.

Abstract: A system and a method of multicavity injection molding of a product, where the gate cannot be placed, as traditionally, at the top of the product, but must be placed at the side of the product; this is accomplished by using inclined secondary runners; the process is exceedingly fast since the secondary runners are not heated in their basic form; disclosed is also the method and means for employing polystyrene as the injection molding material.

Abstract: An apparatus for molding recorded discs includes a pair of opposed mold plates at least one of which is adapted to move toward and away from the other. The mold plates have opposed surfaces which are adapted to form a mold cavity therebetween. A center plate is mounted in each of the mold plates with each center plate having a surface adjacent the opposed surface of the mold plate. One of the center plates has a passage therethrough with a center hole forming pin slidably mounted in the passage. The one center plate has an annular groove in the surface of the passage adjacent the end surface of the center plate. The groove is adapted to receive some of the molding material to form a seal between the center plate and the center hole forming pin and thereby minimize the extent of the formation of flash on the surface of the molded disc.

Abstract: The present invention relates to a mold device for an injection molding machine which consists of an injection machine and a mold device. The mold device is divided into two portions, namely, a mounting portion and a molding portion, which are designed so that they may be handled individually and/or integrally. The present invention further provides an arrangement in which the molding portion may be installed on the mounting portion with considerable transverse tolerance, despite employment of a hot runner system therein.

Abstract: A plate strap is die-cast integrally with an upstanding conducting member, which may be either a terminal post or a riser to form part of an intercell connector, by means of a mold having a cavity affording an elongated plate strap position which is closed at the top and has slots in the floor through which the plate lugs project, and a chimney position upstanding from the plate strap position to form the upstanding conducting member. The part of the floor between the plate lugs is formed by cylindrical dowels each having a diameter substantially equal to the spacing between adjacent lugs. The dowels are retracted to permit removal of the mold from the plate strap or straps. A single mold may form a row of plate straps associated with a number of intercell connectors and a pair of terminal posts.

Abstract: Apparatus for injection molding parts which comprises forming mold cavities from a set of molds and injecting molding material into the cavities to mold a part on a pin extending up in each cavity; the molded parts are then ejected by being pushed up and off the pins when the molds are moved to expose the parts; ejection involves the application of a substantially uniform force over the base of the moulded part. The apparatus includes means for automatically degating moulded parts from waste material involving initial movement of one of the molds in the set relative to the others; automatic degating can be employed which can occur internally or externally of the molded parts; the molds employed with these specific ejecting and degating means, or with other ejecting and degating means, comprise an upper and lower portion of a universal mold base which forms an integral part of the molding apparatus and to these portions are detachably secured modular mold sections.

Abstract: A finished plastic-handled brush is prepared by a single molding step involving gateless molding of the brush back by a tunnel-gating and novel punch-pin finishing apparatus and process which eliminates the usual gate stud, and removing the finished brush back and securing tufts of bristles in the face of the brush back to complete the brush construction.