Abstract: A magnetic coupling for an injection molding apparatus, such as a hot half or hot runner, includes a first magnetic part for connection to an actuator, a valve pin plate, or the like and a movable second magnetic part for connection to a valve pin. The first magnetic part and the second magnetic part are coupled by a magnetic force. The first magnetic part can be part of the actuator. The second magnetic part can be part of the valve pin. A valve pin plate can be provided for a plurality of valve pins.

Abstract: A connection system (36) implementing an electric junction between a heater (22), in particular a heater (22) for a hot runner nozzle (10) and at least one hookup conductor (32) linked to a power source, comprises a hookup body (38, 60, 70) which is made of an electrically non-conducting material and which is fitted with at least one passage (46) to receive at least one hookup conductor (32). Said passage (46) is specified to end in a side face (40) of the hookup body (38, 609, 70). Also the hookup conductor (38, 60, 70) is affixable to and/or on the substrate in a manner that in the specified state, the hookup conductors (32) passing through the minimum of one passage (46) shall make contact by their free ends with the heater (22).

Abstract: Intended is to provide a molding machine using a built-in type motor as an injecting electric motor. In this molding machine, a mounting structure for such a transmission mechanism from a rotational motion to a linear motion, as changes the rotation of the built-in motor into the linear motion thereby to transmit the linear motion to an injecting member, is simplified to improve the assembling workability. For this improvement, a sleeve is fixed in the rotor of the built-in type motor. In the hollow portion of the sleeve, a screw shaft or the rotating portion of a ball screw mechanism and the sleeve are connected and fixed by a connecting member. A nut member or the straight portion of the ball screw mechanism is fixed on a member for performing straight motions together with the injecting member.

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: An injection mold has a lower mold half having a chamber at a top thereof. A holding plate has a top within the chamber formed with a plurality of holding slots. The holding slots extend frontward and rearward. A positioning plate is attached to a front surface of the holding plate, an upper portion of which within the chamber has a plurality of positioning holes at a front surface thereof. A fixing plate disposed rearward of the holding plate has a plurality of through holes at a top thereof. A plurality of first positioning rods is mounted to the installing holes, each of which defines a free end extending beyond the top of the fixing plate. A free end of each of a plurality of second positioning rods is capable of inserting into the positioning hole. An upper mold half is engaged with the lower mold half.

Abstract: Method and apparatus for controlling the delivery of polymer material in a sequential injection molding process. In one embodiment, the method provides: delivering a first shot of a first material simultaneously to a plurality of mold cavities; independently sensing for each cavity a property that is indicative of a volume or flow of material that is delivered to the corresponding cavity during the step of delivering the first shot; independently stopping the step of delivering the first shot to one or more cavities according to a program that uses as a variable a signal indicative of the property sensed for the corresponding cavity during delivery of the first shot; and delivering a second shot of a second material simultaneously to the cavities subsequent to the step of stopping the step of delivering the first shot.

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: A valve pin bushing assembly for an injection molding apparatus. The assembly includes a bushing body for connection to a manifold, a flexible barrier having a first end that is continuously connected to the bushing body, and a valve pin continuously connected to a second end of the flexible barrier. The valve pin extends through a nozzle in a downstream direction towards a mold gate, wherein the valve pin is movable in an upstream direction and in the downstream direction for opening and closing the mold gate. The flexible barrier seals a channel of molding material from an outside space.

Abstract: A localized over-molding die structure may include a core die, a cavity die having an inner space therein and placed onto an upper surface of the core die, and a slide die including a step portion on a lower surface thereof and slidably engaged with the cavity die in the inner space thereof to move upward and downward, wherein, the step portion includes an undercut formed at a lateral side thereof such that when at least two materials are successively injected into the cavity die, a corresponding part to the undercut is formed to at least one of the at least two materials.

Abstract: An apparatus for the measurement of the temperature of a plastified plastic material at the exit of an extruder, characterised in that the function of the sound, velocity in dependence of the temperature is measured and memorised for at least one plastified plastic material, the sound velocity is measured during the extrusion of the plastic material, and the respective temperature is determined from the velocity measurement values and the function.

Abstract: The invention concerns an injecting/blowing device comprising at least one mold for injecting a thin-walled hollow preform capable of being transformed into a more voluminous hollow body by blowing, said mold including a counter mold defining the inner surface of the cavity, a cure located in the cavity and spaced apart from said inner surface, a preform impression located between the counter mold inner surface and the core, and which will receive the melt, at least two main preferential flow channels (CEP) optionally at least two secondary preferential flow channels (CEP), each CEP being delimited by at least one recessed zone at the surface of the core and the inner surface of the cavity.

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: A gas-assisted mold surface heating system is disclosed, which comprise: an air supply, for providing air with a flow rate larger than 300 L/min; a heater, for heating air to a temperature higher than 400° C.; a mold, configured with a mold cavity, an inlet and an outlet; and an air storage tank; wherein, the inlet is connected to the heater through a pipeline for allowing the air from the air supply to flow into the cavity after being heated by the heater and thus to be for heating up the surface of the mold cavity while the heated air is being enabled to flow out of the cavity through the outlet and into the air storage tank. With the aforesaid system, surface temperature of the mold cavity can be raised to a point higher than a glass transmission point in a short period of time.

Abstract: The invention relates to an injection unit (1) of an injection molding machine which is arranged movable relatively to a machine base (2) of the injection molding machine in an axial direction (A), wherein the injection unit (1) comprises a base body (3) at which a screw cylinder (4) is arranged, wherein a screw (5) is arranged rotatable and axially movable in the screw cylinder (4), wherein the screw (5) is connected with a drive element (6) at one of its axial ends which can rotate the screw and can also move it in axial direction (A) and wherein the drive element (6) comprises a gear element (7) which is movable in axial direction (A) as well as an actuator (8) which is in engagement with the gear element (7) and with the base body (3) and which can perform a translational movement in axial direction (A).

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: An injection drive unit includes a hollow cylindrical casing rotatably supported by a housing, the cylindrical casing having an axis and a front end and a back end spaced apart along the axis; a piston in the cylindrical casing, the piston axially slidable relative to the cylindrical casing along the axis between advanced and retracted positions, and the piston rotationally locked with the cylindrical casing to rotate therewith; and a cylinder cap generally closing off the back end of the cylindrical casing and providing a first pressure chamber between the piston and the cylinder cap, the cylinder cap including a stationary part affixed to the housing and a rotary part affixed to the cylindrical casing, at least the stationary part providing a stationary end face opposed to the piston and against which fluid in the first pressure chamber bears when pressurized.

Abstract: An injection nozzle assembly, comprising: a nozzle housing; a nozzle tip having an inlet portion being contactable with the nozzle housing; and a tip retainer being movable relative to the nozzle housing between a first position, a second position and a third position.

Abstract: A mold includes a parting surface, runners, mold cavities, gates and primary air-venting grooves defined in the parting surface. The gates connect the respective runners to the corresponding mold cavities. Each primary air-venting groove includes an air-receiving groove portion and an air-venting groove portion in communication with the air-receiving groove portion. The air-receiving groove portion communicates with the gate and surrounds the corresponding mold cavity. The air-venting groove portion extends to and terminates at a corresponding edge of the parting surface.

Abstract: Provided is an injection molding machine using a built-in type motor as a measuring electric servomotor. In order to reduce the entire length of the machine (the injection molding machine), the metering electric motor is exemplified by a hollow built-in type motor, which includes a cylindrical stator, and a cylindrical rotor positioned in the stator. A sleeve is fixed in the rotor of the built-in type motor, and a member fixing the rear end portion of a screw and the sleeve are connected/fixed. Moreover, a nut member as a straight portion of a ball screw mechanism for converting the rotation of an injecting electric motor into linear motions and the sleeve are connected/fixed.

Abstract: An apparatus and method for optimally mixing and injecting a two part urethane foam which utilizes a unique mixing head having needle type valves which are specially sealed and positioned, able to provide precisely controlled amounts of constituent mixing compounds, and are further able to resist clogging. The apparatus further includes an electric-pneumatic actuation system, an unmixed compound recirculation system, and a cleaning solvent injection system which are functional while the apparatus is in use. The apparatus and method precisely controls the temperature, pressure, and delivery rates for optimum urethane mixture, viscosity, delivery, reaction time, and reliability.