Abstract: An actuator is disposed between a back plate and a manifold and is connected to a valve pin. A nozzle flange, locating ring, or pressure disc can transmit a first load between the manifold and a mold plate. A pressure disc can be disposed between the actuator and the back plate. The pressure disc transmits a second load between the back plate and the manifold through the actuator.

Abstract: An injection molding apparatus is disclosed having an actuated part that is movable in forward and rearward directions with a magnetic valve pin coupling attached thereto. A valve pin for opening and closing a mold gate is coupled to the magnetic valve pin coupling to be movable with the actuated part. When the actuated part is moved in an opening stroke direction and the valve pin experiences a stopping force, the magnetic valve pin coupling permits the valve pin to become decoupled from the actuated part to prevent continued movement of the valve pin with the actuated part.

Abstract: An injection molding apparatus, such as a hot runner or hot half, includes a manifold having a manifold channel and a nozzle having a nozzle channel. The nozzle is coupled to the manifold, and the manifold channel and the nozzle channel are in communication to define a flow channel. A valve pin bushing has a flow restrictor disposed in the flow channel on an upstream side of the valve pin bushing. A moveable valve pin extends through a bore of the valve pin bushing.

Abstract: A device for the production of a three-dimensional object made of solidifiable material having at least one processing unit (11) for the processing of the solidifiable material into a liquid phase to discharge the material from a material reservoir (12) via a discharge unit (13) in the direction of a construction space (17) in the form of intermittent drops (15). The conditions required for this can be satisfied (FIG. 2) via the closing mechanism featuring a plastic malleable solid body joint (24).

Abstract: A check valve for a screw is provided. The check valve includes a retainer tip, operable to be attached to a distal end of a screw shaft, the retainer tip defining at least one melt channel. A first ring is coaxially mounted to and rotationally-coupled with the retainer tip. A second ring is coaxially and slidably mounted to the retainer tip, and is operable to rotate relative to the retainer tip. The second ring is operable to reversibly move between an open position which permits melt to flow through the check valve and a closed position which prevents backflow of the melt.

Abstract: An injection molding shutoff assembly includes a chamber containing a movable body that is biased to a rear position in the chamber by a magnet in the movable body. In the rear position, the movable body provides a seal and prevents flow of molten plastic through the assembly. When the movable body is in a forward position, one or more passages permit flow of the molten plastic around the movable body and to an exit in the chamber, leading to one or more molds. An injection molding machine nozzle tip has a beveled front end which, when in an engaged position, seals with an exterior seat of the assembly block defining the chamber and protrudes into the chamber to prop the movable body to the forward position. A portion of the assembly block proximate the opening for the nozzle tip is made of ferromagnetic material, while the rest is not.

Abstract: An injection molding system comprising an actuator, a mounting plate, a mold and a manifold mounted between the mounting plate and the mold, the mounting plate being removably coupled to the mold, a valve pin comprising a pin stem and a pin connector; the actuator housing being mounted on or within the mounting plate for radial movement upon decoupling of the actuator housing from the mounting plate.

Abstract: Disclosed is a safety connector (100; 200; 300) for a hot runner (600) having a valve stem (104) and an actuation assembly (102), the safety connector (100) including: a shear member (106) releasably interlocking the valve stem (104) with the actuation assembly (102), once the shear member (106) has interlocked the valve stem (104) with the actuation assembly (102), the valve stem (104) becomes movable in response to movement of the actuation assembly (102), and the shear member (106) being configured to shear destructively, and responsive to a predetermined undesired force acting on the shear member (106), the shear member (106) shears and the valve stem (104) becomes released from the actuation assembly (102).

Abstract: An injection molding apparatus includes an inlet component, a plurality of nozzles, and a plurality of hoses, each of which is not heated. The hoses are connected between outlets of the inlet component and respective molding material inlets of the nozzles for conveying molding material from the inlet component to the nozzles. Hoses may also be connected between a rail plate and the nozzles for delivering cooling fluid or actuation fluid for an actuator to and from the nozzles. The nozzles may be fastened to a mold plate of the injection molding apparatus, such as by a threaded bushing. A heated insert may at least partially define the mold cavity to heat molding material in the mold cavity.

Abstract: A actuator assembly for a runnerless injection molding system. The actuator assembly is disposed in injection mold top clamp plate and incorporates a hollow actuator shaft whereby the valve pin passes trough the hollow actuator shaft and is firmly attached to the hollow actuator shaft providing easy access to the valve pin for maintenance. The top clamp plate incorporates openings providing access to actuator assembly. Actuator assembly incorporates a mechanism for attaching valve pin to hollow actuator shaft. The hollow actuator shaft can be activated, hydraulically, pneumatically or electrically in a linear movement providing a gate shut off valve.

Abstract: A cam and cam follower apparatus translates linear cam bar movement to perpendicular valve stem actuation in an injection molding system. The cam bars reciprocate up and down on linear bearing rails such that an actuation plate, fitted with a plurality of valve stems, is cycled normal to the direction of the cam bar movement via cam followers traveling within cam slots in the cam bars. The cam slots in the cam bars are profiled such that the cam followers affect the speed and force at which the valve stems travel while at the same time reducing frictional effects and their associated power requirement. The cam followers of the valve stem actuation plate travel in cam slots in the cam bars from a valve stem forward position, to a valve stem retracted position and ultimately, the entire actuation plate may be removed from the cam bars for maintenance via open ended slots in the cam bars.

Abstract: In one aspect of the present teachings, a torpedo includes a body and a needle pin. The body may have a plurality of blades formed on an outer circumferential surface of the body. The needle pin is received within the body and is axially movable to extend from and retract into a front portion of the body. The plurality of blades may be arranged to ensure a gap between the outer circumferential surface of the body and an inner circumferential wall of an internal space of a nozzle case for receiving a supply of a molten material when the body is received within the internal space. The blades may be formed separately each other.

Abstract: A valve gate assembly for regulating a flow of molten material into a mold. The valve gate assembly includes a movable valve that can be positioned between a fully closed position and a fully open position. The valve gate assembly further includes an actuating system operatively cooperating with the valve to move the valve and infinitely position the valve between the fully closed position and the fully open position.

Abstract: A valve gate assembly comprises a piston that is actuable between a forward position and a rear position and has a piston stop surface and a forward pressure surface. A cylinder has a cylinder stop surface that is disposed to contact the piston stop surface when the piston is in the forward position. The cylinder stop surface is radially outward of at least a portion of the forward pressure surface and a shutoff pin is substantially aligned with the axis.

Abstract: A device for producing plastic moldings has an extruder and a molding tool arranged downstream of an extruder discharge opening. A screw is rotatably guided in the extruder and is axially displaceable to transfer liquid polymers, prepolymers or monomers present in the extruder into the molding tool. A nonreturn valve adjacent to a free end of the screw has a locking ring in contact with the inner circumferential wall of the extruder that includes a seal, which is applied to at least part of its outer circumference and which seals the locking ring against the circumferential wall of the extruder. The sealing material of the seal is selected from the group of the polymers, copolymers and polymer blends with a hardness lower than that of the circumferential wall of the extruder. A nonreturn valve and method of processing liquid prepolymers or monomers into plastic moldings is provided.

Abstract: An improved automatic shutoff nozzle tip which is mounted on the downstream end of a nozzle body of an injection molding machine or the like who's purpose is to act as a passageway for molten plastic fluid allowing the fluid to flow in one direction when urged to open by the pressure created by the forward motion of the plasticizing screw of said molding machine and to close when said pressure is lower than the designed opening pressure. The nozzle, having an convex outwardly extended portion that mates up with a sprue bushing or mold having complimentary convex radii, said nozzle having a orifice on the distal end that mates with a complimentary orifice of said sprue bushing. A nozzle that has a means for attachment to a nozzle body or the like with a rear seat, poppet and spring or similar device who's poppet is normally in the closed position until pressure is applied urging the poppet to move in the downstream direction and providing for a passageway for molten plastic fluid.

Abstract: One or more nozzles define separate nozzle channels. The nozzles are coupled to a manifold, so that each of the nozzle channels communicates with a different mold gate. A molding material distribution insert is coupled to the manifold and has a body defining a distribution channel and a plurality of drop channels equal in number to the nozzle channels. The distribution channel is an open distribution channel formed on an outer surface of the body and enclosed by the manifold. The drop channels intersect the distribution channel and exit the body at a different one of the nozzle channels. A valve pin bushing can extend into the drop channels. Valve pins can extend from actuators, through the valve pin bushing and the drop channels, and to the mold gates. A valve pin holder can be coupled to the actuator and coupled to heads of the valve pins.

Abstract: Disclosed is a hot runner (100), including: a first plate (102) having a first-plate alloy; a second plate (104) having a second-plate alloy, the second plate (104) being coupled with the first plate (102), and the second plate (104) and the first plate (102) defining a manifold pocket (213); a manifold (224) being supportively received in the manifold pocket (213), and the manifold (224) having a drop (225); a nozzle assembly (400) being supportively received by the second plate (104), the nozzle assembly (400) connecting with the drop (225) of the manifold (224); and a nozzle-support structure (101), including: a first load-bearing insert (207) contacting the second plate (104), the first load-bearing insert (207) contacting the nozzle assembly (400), the first load-bearing insert (207) having a first insert material being stronger than the second-plate alloy of the second plate (104), the first insert material being strong enough to withstand a first high-point load (150) to be transmitted from the nozzle

Abstract: A crossover nozzle system for transferring molten plastic from an inlet at the center of the stationary platen of an injection machine to the main manifold of the molding chambers of the stack molds of the injection molding machine. The crossover nozzle system incorporates liquid cooling to create a high viscosity viscous seal from molten plastic at a parting line between moveable components. Accordingly, no other seal is required between the components.

Abstract: A valve gate assembly comprises a piston that is actuable between a forward position and a rear position and has a piston stop surface and a forward pressure surface. A cylinder has a cylinder stop surface that is disposed to contact the piston stop surface when the piston is in the forward position. The cylinder stop surface is radially outward of at least a portion of the forward pressure surface and a shutoff pin is substantially aligned with the axis.

Abstract: Disclosed, amongst other things, is a back-up device that is configured to provide a structural support, in use, between a manifold and a housing member within a melt distribution apparatus of an injection molding system. The back-up device is associated, in use, with a valve-gate apparatus within a nozzle drop. The back-up device includes a cold-side member formed from a first material and a hot-side member formed from a second material. The first material is more thermally conductive than the second material. The cold-side member is configured to be thermally connectable, in use, with the housing member and the hot-side member. The hot-side member is configured to be thermally connectable, in use, with the manifold and the cold-side member. The hot-side member is also configured to prevent the cold-side member from directly contacting the manifold.

Abstract: Disclosed is a safety connector for a hot runner having a valve stem and an actuation plate, the safety connector including: (i) a latch releasably interlocking the valve stem with the actuation plate so that in response to movement of the actuation plate, the valve stem becomes movable; and (ii) a latch mover being cooperative with the latch, and the latch mover being configured to move the latch responsive to a predetermined force acting on the valve stem so that so that the valve stem is released from the actuation plate.

Abstract: An injection molding system comprising an actuator, a mounting plate, a mold and a manifold mounted between the mounting plate and the mold, the mounting plate being removably coupled to the mold, the actuator comprising an actuating member reciprocally drivable along an axial path of travel and a housing removably coupled to the mounting plate; a valve pin coupled to the shaft of the actuator for movement of the valve pin together with movement of the actuating member, the valve pin comprising a pin stem and a pin connector; the actuator having an actuator coupling adapted to reversibly couple to and decouple from the pin connector in a radial direction relative to the axial path of travel, the pin stem extending from the actuator into the manifold when the housing of the actuator is coupled to the mounting plate and the pin connector is received within the actuator coupling; the actuator housing being mounted on or within the mounting plate for radial movement upon decoupling of the actuator housing from th

Abstract: The present invention relates to a mould, in which a completely closed cavity can be formed in one operating state, comprising an injector (10) which is at least partially accommodated in the mould (14) and the discharge opening of which opens into the closed cavity. According to the invention, the injector is designed with a material feed duct (30) and a material return duct (34), wherein the two ducts (30, 34) open into a connecting chamber (32) in the region of the tip of the injector (10) and are flow-connected to one another via said connecting chamber (32). In this case, an injector needle (36) can be switched into at least two operating positions, wherein, in one moved-forward operating position, the discharge opening is closed by means of the tip (38) of the injector needle (36) and, in the other, pulled-back operating position, the discharge opening is flow-connected to the connecting chamber, and the injector (10) is therefore open.

Abstract: An injection molding apparatus includes a manifold defining a manifold channel for receiving pressurized molding material from an upstream source and a nozzle defining a nozzle channel in communication with the manifold channel to define a flow channel. The nozzle is associated with a mold gate of a mold cavity and delivers molding material to the mold gate. A vane, such as that of an impeller or screw, is rotatably disposed in the flow channel upstream of a mold gate. A motor is coupled to the vane and rotates the vane in either direction. Rotation of the impeller or screw can be automatically adjusted by a controller and a sensor that measures pressure, temperature, or other property of the molding material.

Abstract: A nozzle valve gate for injecting hot plastics into an injection mold includes a body having a passage for flow of the plastics to an outlet and forming an actuator chamber. A nozzle part is connected to the body and extends longitudinally to a nozzle tip having an injection aperture. The nozzle part has a flow passageway connected to the plastics outlet for conducting the plastics melt to the injection aperture and a machined bore forming a guide passageway. A valve pin is movable in the guide passageway between open and closed positions. A piston is connected to the pin and is slidable in the actuator chamber. An elastomeric wiper seal extends around the valve pin adjacent the machined bore, is wear resistant, and can withstand high temperatures of at least 200° C. A micro gap is formed between the pin and the machined bore.

Abstract: A hot runner system for an injection molding machine capable of increasing durability of the nozzle includes a manifold having a resin injecting hole extending therethrough in its inner portion, a nozzle having a piston guide bushing formed at its upper end inserted into the nozzle seated groove of the manifold, a manifold guide bushing for surrounding and threadedly engaging with an upper portion of the piston guide bushing of the nozzle, and a fastening bushing for receiving an outer surface of the manifold guide bushing and threadedly engaging with an inner circumferential surface defining the nozzle seated groove of the manifold so that the manifold guide bushing is fastened by the fastening bushing to the inner circumferential surface defining the nozzle seated groove of the manifold.

Abstract: A nozzle valve gate for injecting hot plastics into an injection mold includes a body having a passage for flow of the plastics to an outlet and forming an actuator chamber. A nozzle part is connected to the body and extends longitudinally to a nozzle tip having an injection aperture. The nozzle part has a flow passageway connected to the plastics outlet for conducting the plastics melt to the injection aperture and a machined bore forming a guide passageway. A valve pin is movable in the guide passageway between open and closed positions. A piston is connected to the pin and is slidable in the actuator chamber. An elastomeric wiper seal extends around the valve pin adjacent the machined bore, is wear resistant, and can withstand high temperatures of at least 200° C. A micro gap is formed between the pin and the machined bore.

Abstract: A valve gate assembly comprises a piston that is actuable between a forward position and a rear position and has a piston stop surface and a forward pressure surface. A cylinder has a cylinder stop surface that is disposed to contact the piston stop surface when the piston is in the forward position. The cylinder stop surface is radially outward of at least a portion of the forward pressure surface and a shutoff pin is substantially aligned with the axis.

Abstract: The disclosure relates to a system for injecting a thermoplastic material in the fluid state, including: a dispenser adapted to be maintained at an injection temperature higher than the temperature limit at which the material is in a fluid state; an injection nozzle defining at least one portion of a transition passage; a stopper mounted inside the transition passage so as to slide between a blocking position and an opening position thereof; and control means for alternately sliding the stopper, wherein the control means comprises a jack with a rod parallel to the sliding direction of the stopper, and which is secured in an offset manner on the dispenser via a flattened beam, and a lever arranged so as to tilt about an axis so as to transmit the movements of the jack rod to the stopper.

Abstract: Apparatus for controlling the rate of flow of fluid material from an injection molding machine to a mold cavity, the apparatus comprising: a manifold receiving the injected fluid material and having a delivery channel that delivers the fluid material to the mold cavity; a bushing or insert or plug mounted in an aperture in the manifold having a rate flow control channel communicating with the delivery channel of the manifold; a pin having a flow control member; the pin being adapted for back and forth axial movement within the rate flow control channel wherein a surface of the flow control member is controllably engageable or sealable against an interior surface area portion of the rate flow control channel of the bushing or insert or plug.

Abstract: A hot runner system including a shoot pot system for transferring melt from a single shooting pot to multiple nozzles. Melt is fed from a source of melt into the cavity through the multiple nozzles, and a valve isolates melt in the cavity from melt in the source. A plunger within the cavity is driven forward to inject melt in the cavity into a mold cavity at high pressure without significantly increasing the pressure of melt in the source. The plunger optionally functions as both the plunger and the valve by opening and closing communication between the cavity and the manifold as it is rotated.

Abstract: An injection apparatus for injecting hot plastics material into an injection mold has an actuator section forming an actuator chamber and a nozzle member connected to the actuator section and extending to a nozzle tip having an injection aperture. The nozzle member includes an injection passage system for conducting the hot plastics material to the injection aperture. An elongate valve pin extends through a guide passage in the nozzle member and is movable between open and closed positions. A piston is connected to this pin, is slidably mounted in the actuator chamber and moves the valve pin between the open and closed positions. The piston and actuator section are machined to close tolerances so as to form a micro-gap between the wall of the piston and the wall of the chamber thereby avoiding fluid seals. The actuator is able to operate at temperatures ranging between 200 and 400° C.

Abstract: An injection molding apparatus includes a plurality of valve-gated nozzles, each nozzle having a respective valve pin that is actuated by an actuator. A nozzle tip component for taking one of the valve-gated nozzles of the injection molding apparatus out-of service, wherein the nozzle tip component has a surface that grips the respective valve pin to lock the valve pin in an out-of-service position thereby preventing flow of molding material into an associated mold cavity and causing disengagement of the valve pin from the actuator.

Abstract: A valve gated hot runner nozzle with at least two transition members made of different materials located between a nozzle tip and a mold gate component to provide a thermal transition region. A first transition member in contact with the nozzle tip is less thermally conductive than a second transition member in contact with the mold gate component. The valve pin when in the closed position makes sealing contact with at least the second transition member such that cooling from the mold gate component is transferred to the valve pin to cool the melt in the mold gate area.

Abstract: An injection molding apparatus is disclosed having an actuated part that is movable in forward and rearward directions with a coupling part attached thereto having a spring coupling and a magnetic coupling. A valve pin for opening and closing a mold gate is coupled to the coupling part to be movable with the actuated part. When the actuated part is moved and the valve pin experiences a stopping force, either a spring of the spring coupling is positioned for dampening the stopping force encountered by the valve pin or the magnetic coupling, which is magnetically coupled to the actuated part and/or the valve pin, decouples from the actuated part or the valve pin to limit or prevent continued movement of the valve pin with the actuated part.

Abstract: An apparatus and methods for attaching electrical leads (22, 24) to a heating layer (16) of a heater are provided. An attachment material (50) is thermally sprayed over cords (32) of the electrical leads (22, 24), which are in contact with the heating layer (16) over a contact area (20). The attachment material (50) and the heating layer 16 are further thermally sprayed with a layer (52), which is an isolating material. The thermal sprayed connection between the electrical leads (22, 24) and the heating layer (16) thus provides more intimate contact and an improved electrical connection.

Abstract: A nozzle assembly for selectably conveying material in a flowable condition to a cavity of a mold assembly comprises a nozzle body, a removable nozzle tip, a valve pin member extending through the nozzle body and having a tip end for selectably forming a seal with a valve seat to selectably prevent passage of material into the mold cavity and a pin guide for guiding the valve pin member, the pin guide being partially received within the nozzle tip and partially received within the nozzle body and having at least one alignment surface on the exterior thereof and cooperating with an aligning surface of the nozzle body to align the pin guide relative to the nozzle body and with an aligning surface of the nozzle tip to align the nozzle tip relative to the pin guide whereby the nozzle tip is aligned relative to the nozzle body.

Abstract: A nozzle assembly for selectably conveying material in a flowable condition to a cavity of a mold assembly comprises a nozzle body, a removable nozzle tip, a valve pin member extending through the nozzle body and having a tip end for selectably forming a seal with a valve seat to selectably prevent passage of material into the mold cavity and a pin guide for guiding the valve pin member, the pin guide being partially received within the nozzle tip and partially received within the nozzle body and having at least one alignment surface on the exterior thereof and cooperating with an aligning surface of the nozzle body to align the pin guide relative to the nozzle body and with an aligning surface of the nozzle tip to align the nozzle tip relative to the pin guide whereby the nozzle tip is aligned relative to the nozzle body.

Abstract: A valve gate system for an injection molding machine, having a valve gate unit configured to be in contact with a manifold of an injection molding machine for delivering a molten plastic flow from a hot runner system to an injection chamber. The valve gate unit has a valve pin for controlling the flow of the molten plastic from a hot runner system to an injection chamber and an activating unit coupled with the valve gate unit. The activating unit is configured to be mounted external to a mold unit that houses the injection chamber. In addition, the activating unit has an element that extends through the mold unit to engage the valve pin, so as to control the molten plastic flow from a runner system to an injection chamber.

Abstract: An injection nozzle plugging rod (4) of machines for molding plastic material containers, provided with a locking system suitable for preventing the separation of the parts forming the actuating pneumatic piston of the same rod, said piston being subjected to considerable stresses during the machine operation. Thus, the rod according to the invention is able to prevent the piston binding, and therefore also the locking of the same rod, considerably reducing the number of maintenance interventions and thus increasing the throughput of the molding machine.

Abstract: A valve gate assembly for regulating a flow of molten material into a mold. The valve gate assembly includes a movable valve that can be positioned between a fully closed position and a fully open position. The valve gate assembly further includes an actuating system operatively cooperating with the valve to move the valve and infinitely position the valve between the fully closed position and the fully open position.

Abstract: In an injection molding tool with at least one hot channel nozzle (1), which is provided with a discharge nozzle opening (1a) and a closure needle (2) for closing the nozzle opening, an element (3) is provided by which at least the closing position of the closure needle can be monitored.

Abstract: An actuated part, such as a valve pin plate or actuator piston, is movable in forward and rearward directions. A coupling part is located rearward of the actuated part and held in position by magnetic attraction between the coupling part and the actuated part. A valve pin is coupled to the coupling part. The valve pin extends in the forward direction for opening and closing a mold gate. When a stopping force applied to the valve pin is greater than a force of the magnetic attraction between the coupling part and the actuated part, the actuated part moves away from the coupling part in the forward direction, thereby reducing the stopping force on the valve pin.

Abstract: A nozzle has a valve pin for controlling flow of molding material through a nozzle melt passage. An actuator has a stationary part and a movable part. The actuator further has an extending rod connected to the movable part thereof and a block connected to the rod, the block being movable with the moveable part of the actuator. A pivoting linkage element is rotatably connected to the block of the actuator and is connected to the valve pin of the nozzle. The pivoting linkage element moves the valve pin in response to movement of the movable part of the actuator. A bracket is connected to the stationary part of the actuator. Two sensors are connected to the bracket for detecting different positions of the block. The sensors may be air proximity sensors.

Abstract: A die and mold for manufacturing a mold product is provided. The die and mold includes a body having a cavity that has a shape corresponding to the mold product. The body includes an upper body plate, and a lower body plate facing the upper body plate and combined with the upper body plate. The die and mold also includes a gate. The gate includes an upper gate plate, a plurality of recesses formed on a lower surface of the upper gate plate, and a lower gate plate facing the upper gate plate. A plurality of protrusions is formed on an upper surface of the lower gate plate in a location corresponding to a location in which the plurality of recesses is formed. The gate also includes a resin injection portion through which a resin is injected into the cavity.

Abstract: Among other things, the invention relates to an injection nozzle for guiding hot-melt plastic within a mold, particularly an injection mold. Said injection nozzle comprises a nozzle housing (11) and a nozzle needle (13) which is mounted in a translationally movable manner and is used for opening and closing a melt opening that leads to a mold cavity. The nozzle needle (13) can be moved by means of a driving mechanism (V) to which a transmitting device (14) is assigned that allows a movement of the driving mechanism (V) to be converted into a movement of the nozzle needle (13). The invention is characterized, inter alia, in that the transmitting device (14) is assigned to an attached unit (22) which can be releasably connected to the injection nozzle (10) and inside which a rod assembly (30) is disposed at least in part.

Abstract: Apparatus for controlling the rate of flow of fluid material through an injection molding flow channel leading to a mold cavity, the apparatus comprising: a pin having a longitudinal length being adapted for back and forth axial movement through the flow channel; the pin having a protrusion at a selected position along its length, the protrusion having an upstream end and a downstream end and a maximum diameter circumferential surface intermediate the upstream and downstream ends; the channel having an interior surface area portion which is complementary to the maximum diameter circumferential surface of the protrusion of the pin; and the pin being slidable to a position within the channel such that the maximum diameter circumferential surface of the protrusion forms a seal with the complementary interior surface portion of the channel to stop flow of the fluid material.

Abstract: A valve gate of an injection valve includes a center pin whose end portion is exposed to a cavity, a valve main body accommodating the center pin, a valve tip surrounding an outer circumferential portion of the end portion of the center pin and fixed at an inner circumferential portion of the valve main body, a sleeve pin provided so as to be slidable along the center pin, a reservoir portion formed between the valve main body and the sleeve pin and accommodating a molten resin, and a heater surrounding the reservoir portion, wherein the sleeve pin is displaceable between a position where an opened state is established and a position where a closed state is established, and an end portion of the heater facing the cavity is positioned closer to the cavity than an end portion of the reservoir portion facing the cavity when the closed state is established.

Abstract: Disclosed, amongst other things, is a back-up device that is configured to provide a structural support, in use, between a manifold and a housing member within a melt distribution apparatus of an injection molding system. The back-up device is associated, in use, with a valve-gate apparatus within a nozzle drop. The back-up device includes a cold-side member formed from a first material and a hot-side member formed from a second material. The first material is more thermally conductive than the second material. The cold-side member is configured to be thermally connectable, in use, with the housing member and the hot-side member. The hot-side member is configured to be thermally connectable, in use, with the manifold and the cold-side member. The hot-side member is also configured to prevent the cold-side member from directly contacting the manifold.