Abstract: An injection assembly for injection molding machines for plastics material comprises a fixed frame (10, 21), a plastication cylinder (2) integral with the fixed frame, a plastication screw (5) acting inside the plastication cylinder, making a forward translational movement during the stage of injection of the plastics material into a cavity of a mold and a rotatory movement around its own axis and a rotatory translational movement of rotation around its own axis and retraction during the plastics material plastication stage, the plastication screw (5) being mounted integral in translation with a movable plate (23) mounted slidably on said fixed frame, there being provided drive means for translation of the movable plate (23), and drive means for rotation of the plastication screw (5).

Abstract: A method of sandwich molding, in which a first thermoplastic material is injected into a mold cavity followed by the injection of a second thermoplastic material expanding within the first thermoplastic material, eliminates the need for heated runner systems communicating from the injection nozzle of the injection molding machine to the mold cavity by employing a cold runner having sufficiently slow solidification time to allow subsequent injections from two injection sources. The backflow into the inactive branch is prevented by maintaining the injection nozzle against the mold until molding is complete.

Abstract: A backflow prevention device for an injection molding machine includes a screw tip having a tip end, a central body member connected to the tip end, a thrust ring at a rear end of the body member, and a mounting end for attachment to a plasticizing screw. A locking ring is arranged at a distance to the body member to define an annular gap and is axially movable between an open position, in which a first sealing surface rests against a shoulder of the tip end, allowing passage of material, and a closed position, in which a second sealing surface rests against a shoulder of the thrust ring, prohibiting entry of material. Disposed in the annular gap coaxial to the locking ring is at least one mixing element in the form of a circular ring which has circumferential bores in spaced-apart disposition for axial material transport.

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

Abstract: Moulding apparatus is disclosed which comprises transfer element (12) which has a holding cavity (14) therein for receiving a charge of mouldable material. Mouldable material in particulate or molten form is fed into a heated passage (30) by a feed spiral (40) in a tube (36). A plunger (42) displaces molten mouldable material along the passage (30) and into the holding cavity (14). The transfer element (12) is then displaced to a position in which the holding cavity (14) is aligned with an opening (18) in a backing plate (16). The opening (18) is in communication with a mould cavity (20) having the shape of the article to be produced. A second plunger (46) displaces the charge of molten mouldable material from the holding cavity (14) through the opening (18) and into the mould cavity.

Abstract: The tail end of a heating barrel is supported by a front plate. The tail end portion of a screw is rotatably supported by an intermediate plate. Bearings are built in the rear plate. The nut of each of ball screws is attached to the front surface of the rear plate through a hollow shaft and the bearing. Through holes are provided in the intermediate plate. To the front surface of the intermediate plate are fixed load cells so as to block the front of the through holes. The leading end portion of the threaded rod of each of the ball screws and leading end portion of the nut are inserted in each of the through holes. The leading end of the threaded rod is fixed to the rear surface of the load cell.

Abstract: A substrate having a barrier comprising a raised rim to prevent an in-mold coating from flowing into a gate pin assembly or substrate injection inlet area wherein a substrate is injected into the mold cavity. The barrier prevents cross contamination between a substrate resin orifice and the in-mold coating. A method for isolating an injection inlet area or gate pin assembly from in-mold coatings is also described.

Abstract: A plastic material extruder combines the features of a generally flat rotatable disc and a generally flat opposed stator. At least one of the two is heated by heating elements. The two define a processing gap into which a hopper for feeding a plastic material mixture is discharged. The rotor and the stator develop a high shear force which further heats up the processed mixture in addition to the heating delivered by the heating elements. At the center of the disc/stator assembly, an axial force developing device such as a ram or a feed screw or screws is adapted to further compress and extrude a mixture of the thermoplastic components and thermosetting components, the latter being comprised of crumbled pieces of used tires. The extruder is shown in two embodiments, one injecting the processed alloy into a mold, the other producing pellets of the processed alloy.

Abstract: A leak preventing device for fluid shooting nozzle of an injection molding machine includes a material stop valve pivotally screwed with a front side of a vertical flow passageway of a hot-material passageway plate, a shaft position base provided at a rear side of the vertical flow passageway, a shaft inserting through the stop valve, the vertical flow passageway and the shaft position base, and a material stop end at front end of the shaft supported by a support plate in the material stop valve. The rear end of the shaft protrudes out of the shaft position base and connected to a piston fixed with a mold fix plate for mutual movement to lot the stop end of the shaft rod fitting in a shooting nozzle in the stop valve to prevent raw material inside from leaking out. Besides, after a screw conveying tube shoots out raw material, the remaining pressure in a flow passageway will push the leak-preventing portion to prevent leaking.

Abstract: Process and apparatus for injection molding of molded parts made from plastic material having at least one cavity, which includes: a) injection of plastic melt from an injection unit along a melt flow path into the cavity of an injection-molding die; b) injection of a fluid into the still molten plastic material, so that the latter is pressed against the walls of the cavity; c) allowing the plastic material to solidify until the latter forms the molded part in self-supporting manner; and d) releasing the molded part from the cavity of the injection-molding die.

Abstract: An injection moulding machine includes a mould unit (B) and an injection unit (A) for injecting a plasticated resin into the mould unit (B) through an injection nozzle (11), the mould unit (B) including a mould opening-closing means (36), a first mould (31) which is driven to be opened or closed by the mould opening-closing means (36), a second mould (30) which is operated together with the first mould (31) to define a cavity between them and be brought into contact with the injection nozzle (11), a first guiding means (39) for guiding the second mould (30) in such a manner that the second mould can be moved in the mould opening-closing direction, a stroke-regulating means (40) for regulating the length of stroke in the mould opening-closing direction of the second mould (30), and a first energizing means (41) for energizing the second mould (30) in the including of the first mould (31), and the injection unit (A) comprising a second guiding means (8) for guiding the injection nozzle (11) in such a manner tha

Abstract: A melt transfer system is provided for a stack mold. The melt transfer system includes first and second transfer bushings arranged in opposing platens of the mold. Each transfer bushing defines a portion of a runner passage communicating at shear gates disposed in a shearing surface that is parallel to the direction of opening and closing movement for said platens in order to shear the melt when the platens are moving from a closed position to an open position. In another aspect, the shearing surfaces are normal to the direction of movement of the platens and at least one of the transfer bushings is rotatable relative to the platen for shearing the melt. In another aspect, a transfer bushing is provided having a core formed of an insulative material and a shell formed of a conductive material. The core defines a channel for conducting melt between a shear gate at one end of the channel and an aperture at another end of the channel.

Abstract: The subject of the present application is an auxiliary injection unit (1) for fitting to a first mould (9) for injection moulding a first component of plastics material articles, having at least one connection (3) in one side for the injection of a second component.

Abstract: The present disclosure describes a process and an apparatus for delivery of plastic at a viscosity and in the required quantity suitable for compression molding of large, and often odd shaped three-dimensional products, such as large automotive body parts and large appliance parts, etc. These products may consist of plastic only, or may require additional layers of other plastics or even other materials such as woven cloth, inserted into the cavity before molding. The purpose of this invention is to provide a process and apparatus for use with a compression molding machine to supply plastic to a mold cavity, at a number of suitable locations, and in appropriate quantity at each location as required by product shape and thickness. The apparatus and process includes a delivery head which is mounted on rails attached to the machine clamp or the mold cavity, and a connection between the injection unit of the molding machine.

Abstract: An innovative method and apparatus for synchronizing the flows of molten polymer or similar materials in molding systems which utilize manifolds to direct flow into one or more cavities of an injection mold. The apparatus utilizes intermeshing positive displacement, interconnected gearing systems similar to positive displacement gear pumps in hydraulic systems. These positive displacement gear mechanisms are placed in each parallel flow channel such that all flow in each channel passes through a gear mechanism. Each of the parallel pumps are connected together directly via a shaft or indirectly using hydraulic motors, stepper motors, or other motors to synchronize the parallel flows. Each flow can be different to allow the directing of flows in complex tools or when molding parts in family molds.

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

Abstract: An injection unit for an injection-molding machine for processing thermoplastic material is designed in such a way that a direct drive (EM) which meets high dynamic requirements is used for the injection operation and that a standard motor (DM), the rotational speed of which is optimized to the material preparation process by a gear mechanism (R, RS1, RS2), is used for the material preparation, in which such dynamic requirements do not exist.

Abstract: Injection molding apparatus (10) for molding a thermoplastic article (A) from a moldable thermoplastic material. The molding apparatus includes a core pin (12) around which the article is formed in a cavity that is defined by separable mold halves (14, 16). Moldable thermoplastic material is introduced into the mold cavity, coaxially of the core pin, from an injection nozzle (18) through a restricted passage or gate (20). The nozzle seats solely in a radial extension (16a) of one of the mold halves, which is received in a recess (14a) of the other mold half when the mold halves are closed with respect to one another, and the gate extends solely through the extension (16a) of the mold half (16).

Abstract: In an injection molding machine a mixer is provided that reduces the flow imbalances inherent in the melt as the flow branches within a manifold or other part of the injection machine. The mixer increase melt homogeneity by gradually mixing and changing the melt flow from all helical flow to all annular flow. The mixer provides an improved means for reducing flow imbalances that results in the elimination of weld lines and other part non-uniformities.

Abstract: A clay molding device comprises a clay pressing-out tool, which presses filled-up clay out through an opening, and a mold installed as covering the opening of the clay molding device to be attached and detached freely, in which clay is pressed through the opening of the clay pressing-out tool. A hole and/or a notch is formed in the mold, and a portion of the pressed-in clay can be protruded and shaped by the hole and/or the notch. The mold is united with the clay pressed in the inside and the clay protruded and shaped by the hole and/or the notch, and is able to form a portion of the appearance of a clay molded figure.

Abstract: A process for forming detergent bars by injection moulding in which a pressure is applied to a partially structured detergent composition to deliver it to a mould. The detergent composition can be delivered to the mould in a substantially semi-solid state, at a temperature below 70° C. and at a pressure at the point of injection of greater than 20 psi. Apparatus for forming detergent bars according the invention are also described.

Abstract: An injection moulding unit includes at least two injection moulds for manufacturing disc-like objects. The injection moulds each further include two mould parts which are mutually displaceable between a closed position in which they bound a mould cavity and an opened position in which the disc-like object can be removed. The mould cavity is connected to a pressure line for carrying heated plastic into the mould cavity. A punching means is provided for punching a central hole through the disc-like object. The punching means includes a cylindrical part forming a portion of one of the mould parts and has a leading peripheral edge. The respective pressure lines of the injection moulds are branches of a feed line and together therewith form part of a collective multiple hot runner. The outlet zone of each feed line is configured to couple to an infeed of an injection bush. An outfeed of the injection bush debouches directly into the mould cavity.

Abstract: An injection molding system having a locating ring disposed about and engaged with a pressure bushing. The locating ring is fastened to an outer surface of a clamp plate facing a platen. A first side of the locating ring is disposed against the outer surface of the clamp plate and a portion of a second side of the locating ring is disposed against the platen, thereby supporting the locating ring. The first side of the locating ring is preferably disposed in a recessed mounting surface on the clamp plate and the second side of the radial outer portion of the locating ring is flush with the outer surface of the clamp plate so that both the clamp plate and outer portion of the locating ring are engaged with the platen.

Abstract: The injection moulding machine has a plasticizing cylinder, arranged in whose interior there is a worm with an axial through-hole. The interior of the plasticizing cylinder is connected to a nozzle opening via a cylinder chamber. Operating in the cylinder chamber is a needle which extends through the through-hole in the worm and has a smaller diameter than the cylinder chamber. The tip of the worm constitutes, together with a correspondingly shaped sealing seat, a reverse flow barrier during the injection process. After the end of the injection process the worm is rotated and conveys plasticized plastic material in the direction towards the nozzle opening. As a result of the rising pressure in the worm threads the worm is pushed back and the plasticized material can penetrate into the annular space between the needle and the cylinder chamber. When the worm is rotated further, a pressure is also created in the annular space which slides the needle back into its starting position.

Abstract: The invention includes a system and method for making injection molded dental appliance apparatuses having an injector module removably attached to a dental flask, a press and a controlled compression apparatus, wherein the press and compression apparatus introduce pressure into the dental flask and the injector module, which pressure may or may not be maintained during curing of the appliance. The invention also includes a system for dispensing dental appliance chemicals having at least one chemical dispensing apparatus and a mixing container; whereby a separate dispensing apparatus is used for each chemical and the chemicals are dispensed and mixed in the same container.

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

Abstract: A molding system including an injection molding machine, particularly an electric injection molding machine, with an extrusion nozzle coupled to a hot tip system by an improved pressure bushing. The pressure bushing has a passage therethrough with an inlet and an extrusion nozzle seating surface disposed thereabout on an inlet side of the pressure bushing. The pressure bushing passage includes an outlet coupled to the hot tip system. The pressure bushing passage has a relatively reduced diameter and a reduced axial dimension that eliminate or at least substantially reduce ejecta from the coupling between an extrusion nozzle of the molding machine and the pressure bushing without freeze-out.

Abstract: An apparatus and a method for the melt extrusion of a molten thermoplastic polymer, e.g., as fibers and nonwoven webs, which apparatus and method utilize ultrasonic energy to assist in the melt-extrusion process. The apparatus includes a die housing which defines a chamber adapted to receive the molten thermoplastic polymer and a means for applying ultrasonic energy to a portion of the molten thermoplastic polymer. The die housing includes a chamber adapted to receive the molten thermoplastic polymer, an inlet orifice adapted to supply the chamber with the molten thermoplastic polymer, and an extrusion orifice adapted to receive the molten thermoplastic polymer from the chamber and extrude the polymer. The means for applying ultrasonic energy is located within the chamber. The method involves supplying a molten thermoplastic polymer and extruding the molten thermoplastic polymer through an extrusion orifice in the foregoing apparatus to form a threadline.

Abstract: A casting device with which, by introducing a thermocurable plastics into a heatable casting mould (1), the plastics is thermally cum in that casting mould at least to such a degree that a casting moulded in that manner can be released from the mould, comprises a reservoir for the thermocurable plastics and a feed means for feeding plastics from the reservoir into the casting mould (1), which mould has an inlet opening that extends at least along a substantial portion of the length of the casting to be moulded, wherein the casting device comprises a separate adapter (2) in which the feed means (20, 221, 23) for the plastics is arranged and which can be connected to the casting mould (1) in such a manner that, when the adapter (2) has been connected, an outlet opening (23) provided in the adapter (2) is arranged sealed to and substantially congruent with the inlet opening of the casting mould (1).

Abstract: A molding system including an injection molding machine, particularly an electric injection molding machine, with an extrusion nozzle coupled to a hot tip system by an improved pressure bushing. The pressure bushing has a passage therethrough with an inlet and an extrusion nozzle seating surface disposed thereabout on an inlet side of the pressure bushing. The pressure bushing passage includes an outlet coupled to the hot tip system. The pressure bushing passage has a relatively reduced diameter and a reduced axial dimension that eliminate or at least substantially reduce ejecta from the coupling between an extrusion nozzle of the molding machine and the pressure bushing without freeze-out.

Abstract: An injection plug device for injecting concrete repairing agent into a concrete structure and a connector to be connected to such an injection plug device are provided. The injection plug device has a small diameter, a simple structure, and low manufacturing cost to be appropriate to be used as a disposable device.

Abstract: The invention is directed to a method for adapting injection molding machines utilizing horizontally opening and closing molds and their opening and closing mechanisms to vertically opening and closing molds and their opening and closing mechanisms and vice versa. An injection molding machine might, for example, be utilized to inject hot synthetic resin substantially horizontally into a cavity between horizontally opening and closing molds associated with horizontally opening and closing mechanisms. This horizontal mold and its opening and closing mechanism is removed relative to the injection molding machine and substituted therefor is a vertically opening and closing mold and its associated vertically opening and closing mechanisms. The hot plastic material from the horizontal injection molding machine is initially constrained in movement horizontally but subsequently vertically into the cavity of the vertically opening mold.

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: The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. In this invention, a dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is then applied to the crucible in order to bring the glass-ceramic material to a working range at temperatures above its liquidus temperature. The crucible in which the glass-ceramic material is placed has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic material being heated. The heat deformation properties of the crucible must be such that when the glass-ceramic material in the crucible is in the working range the crucible is heat-pressure deformable without rupturing.

Abstract: Multi-cavity injection molding apparatus having several melt distribution manifolds interconnected by elongated connector bushings. Each connector bushing has an outer sleeve which fits over a nonthreaded cylindrical portion of the main body. The main body is made of a material such as steel with sufficient strength that thermal expansion pushes the manifolds into operating positions slightly further apart without damaging the connector bushings. The outer sleeve of each connector bushing is made of a material such as copper having a coefficient of expansion sufficiently greater than the main body whereby thermal expansion results in the connector bushing forming a seal against melt leakage.

Abstract: The present invention is to improve a laminate molding method and a laminate-molding apparatus for manufacturing molded products that have an external appearance of excellent quality. For this purpose, according to a molding method, by which a mold clamping device (3) laminates sheet of skin material (Mm) and a core resin (200), the tension of the sheet of skin material Mm, which is inserted into a cavity (9) between a clamped fixed metal mold (11) and a clamped movable metal mold (12) and is laminated by the movable metal mold (12), is varied, continuously or in a stepped manner, in consonance with the insertion amount of the sheet of skin material (Mm).

Abstract: In an injection molding process for making thermoplastic articles an in-runner static mixer is positioned near the gate to a mold cavity to mix molten thermoplastic such that said thermoplastic exiting the in-runner static mixer is more homogeneous with respect to temperature than that entering the in-runner static mixer. Passing the more homogeneously mixed molten thermoplastic through the gate to the mold cavity and allowing said cavity to fill and thermoplastic to cool, will result in an article aesthetically superior to one made by a process where no in-runner static mixing device is employed.

Abstract: An improved injection molding apparatus having a fixed mold 7 having a molten resin passage 16b and a movable second mold 8 having a molten resin passage 18 is presented in which residual hardened resin left in molten resin passages of the injection apparatus is removed automatically after every injection operation. The invented device is provided with a reciprocating member 34 which is coupled in molten resin passages 16b, 18, and during the injection step, the molten resin passage 16b is extended to the molten resin passage 18 by moving the reciprocating member 34 into the second mold to communicate a mold cavity 17 with a resin injection device 14. After the completion of the injection step, the reciprocating member 34 is moved to the back position to remove any resin left in the molten resin passage towards the first mold.

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: An injection molding apparatus which enables easier monitoring of the nozzle touch condition from the outside of a clamping unit (70). A stationary platen (10) of the clamping unit (70) is furnished with monitoring holes (16a, 16b). The monitoring holes (16a, 16b) extend from at least either of the front and rear sides of the clamping unit (70) toward a locating hole (12) into which a sprue bush (51) of dies is located. The monitoring holes (16a, 16b) may be interlocked with shutters (22a, 22b) which are opened or closed in response to open or close motion of the purge shield (20). Furthermore, it is possible to provide windows (34a, 34b) in a purge shield (30) so as to allow an operator to look into the monitoring holes (16a, 16b) therethrough.

Abstract: A multi-level stacked mold having at least two and as many as four levels of cavities has a stock distribution mold block centred axially of the stacked mold blocks, the axially extending stock inlet passage to the distribution block connecting with radially off-set stock transfer passages that cross the axially openable mold block interfaces, into the adjoining mold blocks. These openable stock transfer passages, are each provided at their respective, non-encapsulated, radially off-set, opening interfaces with a valveless anti-drool arrangement. The mold flow passage system is subject to continual, extreme, thermal cycling and cyclical mechanical loading, during the repeated opening-and-closing cycles of the mold. Each separable anti-drool sealing interface has a relatively axially displaceable portion extending to bridge the initial gap opening between adjacent mold blocks and serving as an expansible piston means.

Abstract: In an injection molding unit for use in an injection molding machine for processing synthetic materials a coupling device is applied for coupling the feed screw with a spindle by means of an axial locking device subject to the rotational movement. The locking elements of the axial locking device are received in a seat and are provided with several threaded bolts, which are connected to first bore holes of the spindle and are inclinedly arranged opposite to a plane laid through the axis. That way, in spite of its simple construction, a coupling device easy to maintain and reasonable with respect to the price is created.

Abstract: A clamping mechanism for a hot-runner manifold (1) used for injection molding is provided. Screws (11) are used to hold the manifold (1) to a mold plate (7). The screws (11) are attached to clamping members (17) which, in turn, are connected to the manifold. The clamping members (17) include socket portions (21) which are positioned in circular recesses (13) in the manifold. The clamping members (17) can undergo limited pivotal movement due to thermal expansion of the manifold during use.

Abstract: All injection mold for forming an automobile bumper for use on an automobile body has a first cavity region defining a thicker region having a relatively large wall thickness, a second cavity region defining a gradually varying region having a gradually varying wall thickness, a third cavity region defining a thinner region having a relatively small wall thickness and a film gate for successively introducing a molding resin into the first, second and third cavity regions. The thicker region, the gradually varying region, and the thinner region are integrally formed with each other and arranged successively downwardly when mounted on the automobile body. The gradually varying region has a wall thickness reduced at a constant rate from the wall thickness of the thicker region to the wall thickness of the thinner region in a direction from the thicker region toward the thinner region.

Abstract: A molding apparatus includes a rotatable sprue bushing mounted in mold halves and formed with a sprue therein for introducing material into a mold cavity. The sprue communicates with a gate, as an outlet of the sprue, located at a position radially displaced from a center axis of the sprue bushing. Since the sprue bushing is rotated by a ring gear driven by a motor provided in or beside the mold half, the gate of the sprue rotates around the center axis when molten resin is introduced into the mold cavity, and therefore, the molding apparatus can eliminate localization of stress in molded articles, thereby improving quality of the molded articles.

Abstract: A horizontal injection and compression molding apparatus has an injection device (3) and a compression molding device, wherein the compression molding device (2) includes: a stationary die plate (12) for holding a stationary die (11), a movable die plate (22) for holding a movable die (21), means (30) for rapidly extending and retracting the movable die plate (22), relative to the stationary die plate (12), means (40) for locking the movable die plate (22) to tie bars (51) at a position where the movable die plate (22) approaches the stationary die plate (12), and means (50) for fastening the dies after the movable die plate (22) is locked to the tie bars (51); and wherein the injection device (3) for feeding a molten plastic material into a mold cavity (90) between the stationary die (11) and the movable die (21) is characterized in that it initiates feeding of the molten plastic material into the mold cavity ( 90) when the stationary die (11) and the movable die (21) are parted from each other by a predeter

Abstract: The synthetic material can be injected into the mold carrier, which can be selectively mounted with injecting molds, by an injection molding unit shiftable in horizontal direction transversely with respect to the injection axis. When shifting the injection molding unit the ending sections of the drive unit are received in seats of a seat support movable at the mold carrier. The shifting device engages at the mold carrier and in the region of the seat support. Besides, the injection molding unit is freely displaceable into shifting direction. That is how a shifting of the injection molding unit in a cost-saving and simple way is achieved, meeting all demands arising during the injection process.

Abstract: An injection molding unit has an injection molding machine 1 for injecting a molten resin plasticized in a screw cylinder 4 from a nozzle 9 fitted at the tip of the screw cylinder 4 by advancing a screw 3. An injection mold 31 forms a hollow 36 for forming an injection molded product 35 with a cavity mold 33 and a core mold 34. The injection molding unit further has a pressure relief valve 40 for releasing the resin out of a resin passage when a pressure greater than a predetermined value acts at any point on the resin passage, including the screw cylinder and ranging up to the terminal end of the hollow. The cavity mold 33 is of a split construction, in which a wall portion of the hollow is formed a plurality of segments.

Abstract: A highly reliable hot sprue bushing with an interchangeable tip having multiple edge gates for use in controlling the temperature of plasticized material while it flows from the injection nozzle to the gates of a multiple cavity mold. Advantageously, the hot sprue bushing is adjustable in length so that it can be used with a full range of standard or custom mold plate thicknesses or other required lengths and the interchangeable tip does not require separate heating and temperature control.