Abstract: An injection molding apparatus comprises a first sprue bar element having a first sprue channel for receiving a melt stream of moldable material under pressure. A second sprue bar element has a second sprue channel for selectively receiving the melt stream from the first sprue channel. A manifold has a manifold channel for receiving the melt stream from the second sprue channel and delivering the melt stream to a nozzle channel of a nozzle. A mold cavity receives the melt stream from the nozzle. The nozzle channel communicates with the mold cavity through a mold gate. A first gate assembly is coupled to an outlet of the first sprue bar element for selectively restricting the flow of the melt stream from the first sprue channel. The first gate assembly is movable to restrict the flow when the flow of the melt stream between the first sprue channel and the second sprue channel is interrupted.

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: Injection nozzle (8) for polymers which are not crosslinked, but which can be crosslinked, especially gum elastic, rubber and polysiloxanes discharges with its nozzle tip (15) in the area of the mold cavity (6) at the entry hole (18) which is located in the mold plate (2) and which discharges into a mold cavity (6). In the nozzle (8) there is a nozzle needle (40) which can be moved axially by a linear motor (50) and which can be moved out of the closed position which seals the hole (16) in the nozzle tip (15) and into the open position in which the end of the needle (40) is located at a distance from the tip hole (10) in the nozzle tip (15). The injection nozzle (8) is cooled via a temperature control jacket (13, 14) through which a temperature control liquid flows. In the closed position the end surface (73) of the nozzle needle (40) is flush with the surface (74) of the mold cavity (6) in which the entry hole (18) is located.

Abstract: A nozzle for an injection molding apparatus is provided. The injection molding apparatus has a mold component that defines a mold cavity and a gate into the mold cavity. The nozzle includes a nozzle body, a heater, a tip, a tip surrounding piece and a mold component contacting piece. The nozzle body defines a nozzle body melt passage therethrough, that is adapted to receive melt from a melt source. The heater is thermally connected to the nozzle body for heating melt in the nozzle body. The tip defines a tip melt passage therethrough, that is downstream from the nozzle body melt passage, and that is adapted to be upstream from the gate. The tip surrounding piece is removably connected with respect to said nozzle body. The mold component contacting piece is connected with respect to the nozzle body.

Abstract: A nozzle is provided for an injection molding apparatus. The nozzle includes a nozzle body, a heater, a tip, a tip surrounding piece. The nozzle body defines a nozzle body melt passage, which has an inlet that is adapted to be downstream from and in communication with a melt source. The heater is connected to said body for heating melt in said nozzle body melt passage. The tip defines a tip melt passage that is downstream from and in communication with said nozzle body melt passage. The tip melt passage has an outlet that is upstream from a gate in a mold component. The tip includes a tip sealing surface. The tip surrounding piece includes a first tip surrounding piece sealing surface. The first tip surrounding piece sealing surface and said tip sealing surface are separated by a gap. The gap is sized to inhibit the flow of melt between said first tip surrounding piece sealing surface and said tip sealing surface.

Abstract: A nozzle system is provided for an injection molding machine. The nozzle system includes a nozzle tip that is removably connected to a nozzle body with a sealing and mounting sleeve element. The nozzle body includes a first connector for releasably connecting with a second connector defined on the sleeve. The sleeve element further includes an alignment bearing for engaging a bearing surface defined on the nozzle body for precisely locating the nozzle tip within the nozzle body along on a predetermined axis. Further embodiments of the invention provide a valve pin disposed in the nozzle body and nozzle tip. The valve pin includes a bearing surface for engaging a guiding surface defined on the second melt channel for aligning the end of the valve pin with a mold gate. Further embodiments also provide an integrally connected nozzle tip and sleeve element.

Abstract: An injection apparatus is disposed to be movable relative to the frame. A driver advances and retracts the injection apparatus. An energy absorption element is disposed between the driver and the frame and adapted to absorb mechanical energy relating to the nozzle touch force. A buffer member may also be disposed between the injection apparatus and the driver. In this case, variation in nozzle touch force due to overload can be adjusted by the action of the buffer member. Accordingly, when the buffer member is adjusted so as to reduce the variation in nozzle touch force due to overload, an excessively large nozzle touch force is not generated, so that breakage of the mold apparatus and the nozzle can be prevented. Further, resin is prevented from leaking from any clearance between the injection nozzle and the molding apparatus.

Abstract: A dynamic molten mass guide sleeve disposed to articulate to compensate for differences in expansion between an inner hot flow hot channel injection and mold cavity with air gap insulation therebetween. Prior fixed molten mass guide sleeves required extremely stringent location deviations and often led to mold cavity ruptures or leakage as a result of differential expansion between the nozzle body having the hot flow channel and the mold cavity channel. The inventive sleeve is fitted with peripheral sealing lips at each end and is mounted between the body having the hot flow channel and the mold cavity (6). The sleeve compensates for differential heat expansion while enabling well-defined temperature separation in the mold feed orifice area of the injection mold by sealing the air gap (4).

Abstract: A nozzle having an internally threaded bore communicating through a mold body with a source of a pressurized gas, and an externally threaded pin received within and engaging the threaded bore. The pin has a machined longitudinal surface creating an air passage through the bore when the pin is in place. At the outlet end of the nozzle the pin carries one or more washers having air passages machined therein.

Abstract: An injection unit for injecting plastic into a cavity of a mold includes an injecting device connectable between an extrusion die and the mold. The injecting device includes a mouth having a plurality of openings that is insertable into the mold so that the plastic flows through the plural holes into the mold. A drive is connectable to at least a portion of the injecting device for rotating the mouth portion and the plural opening of the injecting device about a central axis as the plastic flows through the holes into the mold.

Abstract: An injection press apparatus for molding/joining separate parts. The apparatus having a work table with first and second work stations for injecting material into a mold. A movable extruder/injection assembly is provided which has an extruder portion for extruding material, and an injection portion for injecting material. The extruder portion and injection portion are in fluid communication such that material is provided from the extruder portion to the injection portion prior to injection of material from the injection portion to the mold. The injection portion of extruder/injection assembly has a nozzle assembly for receiving and injecting material from the injection portion to a self-actuating mold clamp assembly at the first or second work stations. The first and second work stations support the mold clamp assembly which receives the molding material. The extruder/injection assembly is movable between the first and second work stations by a shuttle assembly.

Abstract: The invention is directed to an improved wear-resistant sprue bushing typically for use in plastic injection molding operations. The sprue bushing has a body member, a nozzle seat and a wear-resistant liner. The sprue bushing shortens cycle times by facilitating cooling and has an increased service life.

Abstract: An injection mold machine (10) is disclosed including a mold (40) having closely spaced mold cavities (56, 58). A heated sprue bushing (62) is disposed between the mold cavities so that the runners (142, 144) are relatively short. The sprue bushing has an elongated portion (78) that is narrow and fits between the mold cavities (56, 58). Two rather slender cartridge heaters (126) are disposed in holes (112, 114) formed in the elongated portion on opposite sides of the sprue opening (102) through which the molten material is injected.

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: A gas nozzle for a gas assisted injection molding system includes a body having an inlet in fluid communication with a source of pressurized gas, an outlet through which the gas leaves the nozzle and a passage extending between the inlet and the outlet. The outlet includes a plurality of apertures arranged in a predetermined manner relative to one another such that the flow path through the outlet approximates a 1/8 inch hole but does not clog with resin over successive plastic injections into the mold.

Abstract: A pair of injection units and a common co-injection manifold are carried on a slide mounted a machine base. The machine base carries a mold element, and the injection units and manifold are moved in unison with respect to the mold element. The injection units are, in turn, carried on slideways mounted to the machine slide such that the injection units may be separately moved relative to the co-injection manifold.

Abstract: A nozzle for directing molding material from a material source to a sprue, includes a first surface adapted to connect the nozzle to the material source. The first surface is also adapted to be adjacent to and pivotally movable relative to the material source and in material communication with the material source. A second surface is adapted to be positioned adjacent to and pivotally movable relative to the sprue. The second surface is in material flow communication with the first surface and adapted to be in material flow communication with the sprue. A channel is included for establishing the material flow communication through the nozzle.

Abstract: An improvement in the construction of a unit carriage (5), on which an injection unit (4) is mounted in a injection molding machine, the improvement being concerned with simplifying the construction of the unit carriage (5), making easier the removal of a screw and nut (19, 20) of the nozzle touching mechanism (6), preventing the screw (19) from whirling, and making easier continuously detecting actual nozzle touching pressure.

Abstract: A multi-functional mold which is used for encapsulating chips placed on lead frames is characterized by a chamber arranged in one of the mold halves in which an insert can be replaceably arranged. Depending on the use of the mold in the context of the so-called transfer molding method or injection molding method a different insert is placed in the chamber. In the application as transfer mold the insert includes an elongate member with a bore for guiding a plunger which makes encapsulating material liquid due to the pressure applied thereto and the increasing in temperature. In the application as injection mold the insert includes a member with a through-channel allowing a plasticized encapsulating material coming from a nozzle of an injection molding device to flow into the mold.

Abstract: An injection molding apparatus comprising two spaced, parallel lower guide rods mounted to an undercarriage. A ram carriage and a barrel carriage are slidingly mounted on the lower guide rods. A feedscrew ram extends from the ram carriage into a tunnel formed in the barrel carriage to inject plastic out of a nozzle attached to the end of the barrel farthest from the ram carriage, and into a mold. Two spaced, parallel upper guide rods extend from the barrel carriage to slidingly engage the ram carriage. A pair of hydraulic cylinders displace the ram carriage with respect to the barrel carriage. A third hydraulic cylinder displaces the barrel carriage with respect to the undercarriage. The undercarriage, pivotally mounted to a base, is pivoted by a screw jack which displaces the undercarriage about an arcuate path.

Abstract: A device for generating nozzle contact pressure for the nozzle of a plasticizing and injection unit includes a spindle drive system and a measuring sensor to detect when an appropriate nozzle contact pressure has been achieved. The device generates nozzle contact pressure and also makes it possible to adjust and set the contact pressure of the nozzle.

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 molding flask structure for molding close tolerance articles, such as prosthetic dental devices. The flask structure includes upper and lower flask members that each include cup-recesses adapted to face each other to define therebetween a mold cavity when the flask members are connected together. Assembly of the flask members is effected by a plurality of connecting bolts to securely hold the flask members together. Vent passageways are provided in the flask members to extend from the mold cavity to permit excessive internal pressures to be relieved to the exterior of the flask member. A sprue opening defined by semi-cylindrical recesses in contacting faces of each of the flask members extends from the mold cavity to the exterior to permit the introduction of molding material into the mold cavity. The sprue opening is partially threaded and partially unthreaded.

Abstract: An improvement in an injection press composite molding machine, provides a nozzle touch mechanism in which even when the horizontal injection unit expands or contracts due to heat, the positional relation between the injection nozzle and the mold remains unchanged, and in which initial alignment of injection nozzle with the mold is easy, and further in which the thermal expansion or contraction thereof is small. An adjusting mechanism (40) for adjusting the position of an injection nozzle (10b) is provided on an upper portion of the stand (9) which presses the injection nozzle (10b) onto a lower mold (3). A positioning stopper (21) is provided for one end of a base (14) to which a table (4) of a horizontal injection unit (10) is journaled. The adjusting mechanism has a plurality of bolts for adjusting the vertical and horizontal positions of the injection nozzle. A heat insulating member may be interposed between the tips of these bolts and the injection nozzle.

Abstract: A resin injection port has a tapered outer cylindrical surface, an inner resin passage which is also tapered, and one or more grooves in the outward end thereof to provide a keyway for locking the plastic in the end after cure. The port also has a flange, with a recess matable with a head of a retaining bolt through rotation such that the port is twisted into position for injection. This simultaneously compresses an O-ring which provides a tight seal between the port and the mold. The flange has cut-away portions which align with the bolt head prior to twisting into position. Additionally, the mold has at least one pin which engages a corresponding inner cam surface on the port. The inner cam surface travels over the pins as the flange is twisted to force the port to break the plastic, release and move away from the mold with a 1/4 turn. Utilizing such an injection port provides a means for quickly releasing an injection port from a mold without requiring slide hammers or other such devices.

Abstract: An injection molding apparatus includes a screw housed in a heating cylinder, a rotator for rotating the screw, a linear mover for moving the screw linearly, a motor for driving the rotator, a driver for driving the linear mover, and a base member for supporting the screw, the rotator, the linear mover, the motor and the driver. The screw, the linear mover and the rotator are supported by the base member along a vertical line against the ground. In the injection molding apparatus is a nozzle touch mechanism which includes a support member mounted on the base member, and a member for mounting a die member mounted on the support member to support the die member. The die member is mounted by the member for mounting the die member so that a molding material entrance port of the die member engages an injection port of the heating cylinder.

Abstract: The sprue bushing is mounted within a support housing for an injection molding machine. Melt viscosity of plastic employed is controlled by moving water through the bushing inner tube during the presence of the plastic. The bushing has an outer sleeve containing a longitudinal central bore. An inner tube is mounted within the bore, but spaced apart from an inner wall of the bore. Baffles mounted on opposite sides of an outer wall of the inner tube prevent water movement around an upper portion of the tube. A lower portion of the tube having a smaller outer diameter than the upper portion permits the water to flow under the baffles and through the bushing.

Abstract: In a combined injection-molding and pressing machine according to the present invention, an injector (10a) of horizontal injection apparatus (10) is disposed below a stationary die plate (2) of a vertical press (1), an injection nozzle (10b) of the injector (10a) is formed into an L-shaped, and the injection nozzle includes a valve (10c) for opening and closing a resin passsage. Corresponding to extension and contraction of the horizontal injection apparatus (10), a base (14) of a platform (4) mounting thereon the horizontal injection apparatus (10) is allowed to slide about the injection nozzle (10), and the L-shaped injection nozzle (10b) is caused to contact with a lower mold (3) at a predetermined surface pressure. Therefore, color changing and purging of resin is more efficient and complete. No need of a hot runner permits to employ an inexpensive and versatile mold that is more widely used in common.

Abstract: A high tonnage reaction injection molding (RIM) press has fixed and movable platens for clamping a composite mold therebetween at a closed mold position. A plurality of high pressure hydraulic cylinders are mounted on a carrier for the movable platen, and a locking mechanism having a plurality of incrementally spaced locking positions is effective to lock the carrier selectively at said positions. A pair of low power hydraulic piston-cylinder assemblies connected with the carrier adjacent to its opposite ends move the carrier and movable platen to the closed position. Short stroke connecting rods operated by the high pressure cylinders are forced independently of each other into high tonnage engagement with the movable platen at a plurality of locations within the area of the composite mold to clamp the latter between the platens and positively seal its junctures, whereupon a RIM mix head injects the high pressure reactive chemicals into the sealed mold.

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 nozzle touch apparatus in an injection molding machine is provided, which is capable of preventing deformation of a stationary mold half due to a nozzle touch force applied thereto, and of making it possible to use a mold of a type liable to be deformed for production of precise molding products. Springs interposed between a seat plate of the nozzle touch apparatus and a projecting wall of an extruder base generate the nozzle touch force which varies in magnitude as a function of a compressed amount of the springs. Upon a mold lockup state being released, a ball screw is rotatively driven, so that the seat plate, which is integral with a ball nut engaged with the ball screw, retreats from its moved position at the mold lockup state, to reduce the nozzle touch force and prevent deformation of the mold.

Abstract: A nozzle touch sprue bushing device for a unit-type injection metal mold which includes a molding body such as a metal mold including an inner mold element which is removably mounted on an outer frame mounted on an injecting molding machine, wherein a sprue bush has a nozzle touch provided at a rear end thereof for fitting with an end of a nozzle of an injecting machine, and has a front end formed in such a fitting configuration as to allow fitting engagement thereof with a material admitting portion of a metal mold.

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.

Abstract: There is provided an apparatus for the manufacture of plastic parts from thermoplastic, thermoset and/or elastomer material by injection molding or reaction injection molding. The apparatus includes a multi-station locking unit of horizontal or vertical configuration adapted to hold a number of molds, and an associated injection unit for the simultaneous injection of the molds. The apparatus further has a movable center mold clamping plate sectioned lengthwise relative to the locking direction, the two parts of the plate being kept together by a high-speed clamping device and having arranged between the parts a melt conduction system having one or a number of separate melt conduction rails. Each melt conduction rail is rigidly clamped at its face between the sectioned mold clamping plate lengthwise relative to the direction of flow of the melt.

Abstract: A cut-off nozzle system is mounted on the melt conduction duct of the center, sectioned mold clamping plate of an injection molding machine, in such a way that in addition to rapid accessibility of the individual parts of the nozzle system, the center, section mold clamping plate can be easily and quickly separated from the associated screw unit as required for the removal of the molded parts from the molds. The nozzle system has a spacing ring with a torpedo as well as a right-angled adapter and a cut-off nozzle, which parts are exchangeably joined with each other to form one rigid unit. With a high-speed clamping device, this unit is fastened on the movable center, sectioned mold clamping plate. For the upward removal of the molded parts, the screw unit is displaced sideways while the cut-off nozzle system remains mounted on the center mold clamping plate.

Abstract: A plasticizing and injection group of mechanisms is detatchably secured on the injection side tool holder through a press-on and shift assembly. Releasable attachment occurs by automatically engageable and disengageable couplings each having a head, arranged at the end of an axially movable connecting element, e.g. of a piston rod of a press-on and shifting device. Slides engage the piston rod from behind a protuberance thereof slide back and forth crosswise to the connecting element. The slides are controlled by a central control unit of the machine. To perform maintenance work, the coupling is disengaged, and for better accessibility of the injection nozzle, the plasticizing and injecting group is moved away from the tool holder and can be pivoted out of the injection axis. Any manual work for releasing the attachment of the connecting element on the tool holder is eliminated.

Abstract: A mold assembly for manufacturing composite plastic products includes a mold cavity part and a lid, which is joined to form a cavity for foam precursors. The precursors expand in the cavity in a known manner to fill the cavity with a suitable layer of foamed material, such as foamed urethane. The mold cavity supports an exterior shell and the lid supports an insert for reinforcing a finished composite product. A sleeve is integrally formed on the preformed shell and it in turn is located within an access port formed through wall of the cavity part to define a slideway for receipt of a pour head extension. The extension is selectively clamped and unclamped with respect to the shell sleeve by an inflatable seal clamp which is formed as an annular ring with a pressurizable passage connected to a source of selectively applied pressure.

Abstract: An injection molding apparatus for forming plastic items employs a mold formed of tool members which mate to form a mold cavity. A mold core assembly includes a pull core adapted to extend into the mold cavity and a core support member from which the pull core depends. A nozzle is provided for introducing liquid plastic into a runner which communicates with the mold cavity. The nozzle has a retracted position and an injection position. The nozzle is attached to the core support member such that movement of the nozzle between the retracted position and the injection position causes movement of the pull core, and such that fluid may pass from the nozzle into the runner. The nozzle may be attached to the core support member in a manner to allow the pull core to move laterally with respect to said nozzle.

Abstract: In a nozzle touch mechanism for urging a nozzle (3) of an injection unit (1) against a mold (4), the mechanism urges and holds the nozzle (3) against the mold (4) through a simple structure. The threaded portion (11a) of the ball screw (11) of the mechanism is engaged with a ball nut (13) fixed to a pressure plate (12) for moving the injection unit (1) through springs (15a, 15b). When a predetermined flexure of the springs (15a, 15b) is generated to urge the nozzle (3) against the mold (4) with an appropriate urging force, the threaded portion (11a) is disengaged from the ball nut (13) at that point. The threaded portion (11a) holds the injection unit (1) at this position and urges and holds the nozzle (3) against the mold (4) by the flexure of the springs (15a, 15b).

Abstract: A locking ring for use in an injection molding machine and for securing a sprue bushing in place with respect to a mold plate assembly such that the sprue bushing is retained in place with respect to movement in the direction of the longitudinal axis of the sprue bushing bore, and from rotating in the bore.

Abstract: Apparatus for injection molding plastic parts. The method includes the step of melting and pressurizing plastic material, directing the molten pressurized plastic material into passages leading to a mold, a selectively opening shut-off valve disposed along the passages, selectively closing the shut-off valve after a predetermined amount of molten pressurized plastic material has entered the mold and cooling the predetermined amount of molten pressurized plastic material in the mold to form a part. The apparatus includes an extruder providing pressurized molten plastic material, a mold adjacent the extruder, passages interconnecting the extruder with the mold, and a selectively operable shut-off valve disposed along the passage.

Abstract: An injection molding machine is disclosed in which molten resin from an extruder is injected into the cavity of a mold through a nozzle. A runner body disposed between the mold and the extruder has a substantially L-shaped hot runner for supplying the molten resin from the extruder to the mold therethrough. The runner body is pivotably supported by a support assembly and is horizontally slidable relative to the support assembly to accommodate thermal expansion, whereby the nozzle mounted on the runner body can be brought into or out of intimate contact with the mold. To accommodate the thermal expansion of the runner body only toward the extruder, a stopper is provided on the base frame.

Abstract: The output of a plastic or polymeric material processor is fed through a three-way valve to an expandable chamber in a barrel having a ram therein. When the chamber has a predetermined charge the valve is shifted to direct the output of the plasticator to an accumulator. Operation of the ram injects the material into a mold cavity and thereafter the valve shifts to direct the combined output of the plasticator and the accumulator to recharge the chamber.

Abstract: A vibration-aided feed device is operatively disposed between an injection head and a mold. A feed channel is provided between the injection head and the mold for the flow of the plasticized molding material to the mold. A part of the feed channel is defined by a distribution channel running through a connecting body. A vibrating arm extends laterally from the connecting body and a vibration generator is coupled to the vibrating arm. The resulting vibrations imparted to the plasticized molding material improves the flow and distribution of the molding material and the quality of the ultimate molded article.

Abstract: A plastic bonded magnet is formed of a solidified mixture of thermoplastic powder and magnetic particles capable of being permanently magnetized. The magnet in one form is cylindrical and provided with a coaxial bore. The particles are substantially uniformly dispersed throughout the magnet in coaxial sections extending between the cylinder axis and the periphery of the magnet. Also the particles are substantially commonly aligned throughout. A given quantity of the particles may be orientable which leads to the common alignment.The method of fabricating the magnet includes the steps of mixing quantities of plastic material and solid magnetizable particles to obtain a substantially uniform mixture. The mixture is injection molded to form the magnetic body, the molding step including the injection of the mixture into a cavity having a form of the body, primarily cylindrical, and through a disc-shaped gating orifice on the aforesaid axis, which is midway between the body ends.

Abstract: Molding apparatus for encasing a wood pallet in plastic including a press with plural platens and plural carrier plates between the platens. The carrier plates carry plural mold frames between each pair of carrier plates. Each frame has an injection part. Movable means are included for connecting the mold injection parts with the resin supply. The frames are disposed at an angle to the horizontal for easy venting.

Abstract: An upright injection-compression pressing machine for the manufacture of information carrier discs, such as photograph records and video discs, has a mold clamper assembly including a pair of stamper bearing molds movable relative to each other in a vertical direction towards and away from each other, and an injector assembly mounted on the clamper assembly in alignment with the direction of the relative movement of the molds.

Abstract: An injection nozzle for use in an injection molding apparatus including a generally annular base portion which supports a generally cylindrical hollow side wall portion. The hollow side wall portion terminates at its upper end portion in an inwardly beveled heat transfer control portion. The beveled heat transfer control portion terminates in an angled mating portion which is of complementary angle to the angled mating surface of an injection nozzle accepting recess in the injection mold portion of the apparatus. The injection nozzle structure provides for controlled heat transfer control from the sprue portion of an injection molded parison to prevent crystallization in the sprue portion of the parison.

Abstract: An annular flow plastic extrusion nozzle or gate is provided with a torpedo to heat the plastic to be extruded through the gate. A passage is provided around the torpedo and the torpedo has a flattened end in the parting line of the mold. An annular opening is provided around the base of the torpedo in the nozzle or gate housing. A conical recess is provided in the flat end of the torpedo to receive a correspondingly shaped male extension of a shaft or core pin removably mounted in a portion of the mold. A hub cavity in that portion of the mold may be provided around the end of the pin and mold cavities extend therefrom as desired to form propellers or impellers or rotors of the desired configuration. Discharge of the flowable plastic through the 360.degree.

Abstract: A method and apparatus for forming a thermoset in-the-mold coating on a hot, cured glass fiber reinforced thermoset resin substrate by (1) separating the mold halves slightly while maintaining a seal with the shear edge, (2) injecting an in-the-mold coating resin in a stream which flows parallel from the injector onto a surface of the substrate, and (3) closing the mold and curing the coating under pressure. The separation and of the mold halves is performed by the conventional mold ram. Preferably the mold surface forming the coated surface of the substrate is roughened.