The present invention refers to an injection molding nozzle for introducing a molten plastic to a mold cavity (15) of an injection molding tool via a slot gate (2, 2, 3). The injection molding nozzle includes a nozzle core (2, 3, 3) having an elongate edge (3B) and is received in an opening (1A, 1) in a housing (1, 1). A portion of the nozzle core (2, 3, 3) is spaced apart from the housing (1, 1) so as to define a nozzle flow channel that is in fluid communication between a source of the molten plastic and the slot gate (2, 2, 3), and at least a downstream portion of the nozzle flow channel that is between the housing (1, 1) and the nozzle core (2, 3, 3) surrounds the nozzle core (2, 3, 3) on all sides.

A hot runner injection molding apparatus includes a hot runner nozzle and a first heater coupled to the nozzle body of the nozzle. A separate mold gate insert surrounds a nozzle tip area of the nozzle. The mold gate insert is heated by a second heater that is separate and independent from the nozzle body heater. The temperature generated by the first and second heaters is measured by a first thermocouple and a second thermocouple, respectively. A controller is used to adjust at any time the temperature of the first and second heaters independently. The second heater is used to either i) melt, and thus enable a faster removal of, a colder molten material accumulated around the nozzle tip during a color change procedure or ii) to reduce or increase the temperature of the nozzle tip differently from one nozzle to the next.

An injection molding apparatus and hot runner system are disclosed. The injection molding apparatus includes a plurality of mold plates in which the hot runner system is received. A manifold receives molding material and has a manifold channel that extends between an inlet and an outlet. A nozzle delivers moldable material to a mold cavity. The nozzle has a nozzle channel in fluid communication between the manifold channel and the mold cavity. A valve pin seal is located at the upstream end of the nozzle, and a valve pin that is connected to an actuator extends through the manifold and nozzle is slidably received in the valve pin seal. The hot runner system further includes a thermal bridge that is in conductive thermal communication with the valve pin seal and a cooled one of the plurality of mold plates.

A hot or cold runner device for an injection mold includes a distributor block for polymer melts or polymeric liquids such as liquid silicone. The distributor block includes at least one central supply line, at least one melt channel, at least one fluid outlet, and at least one exchangeable deflection and/or distribution insert. The deflection and/or distribution insert has a sleeve and a cone element for deflecting and/or distributing the melts or liquids and is mounted without gaps and without offset at flow channel transitions by a pressing-in process, and the cone element is held in the sleeve in a self-locking manner.

An injection molding mold including: a flow path through which a molten resin passes; a main body portion including an introduction portion configured to introduce the molten resin into the flow path and a supply portion configured to supply the molten resin from the flow path to a cavity mold; and a plug unit formed with a plug flow path which is a part of the flow path, the plug unit being attachable to the main body portion, in which a prevention portion configured to prevent a pressure loss from occurring when the molten resin passes through the flow path is formed at a portion of the plug flow path where a moving direction of the molten resin changes.

An apparatus includes a stem connector configured to connect a movable piston with a valve stem, in which the movable piston is slidably receivable in a cylinder, and in which the cylinder is mountable to a distribution manifold of a molding system. The stem connector maintains connection between the movable piston and the valve stem while the valve stem is moved to selectively open or close a mold gate of a mold assembly installed in the molding system. The stem connector urges the movable piston to tilt at a tilt angle while the movable piston is moved along an interior of the cylinder, and in which the tilt angle is formed between a central piston axis extending through the movable piston and a central stem axis extends through the valve stem.

An injection molding apparatus for receiving molten material from an injection nozzle and delivering the molten material to a mold cavity is disclosed. The injection molding apparatus includes a molten material conduit device for receiving the molten material and directing the molten material to a molten material receiver defined by a manifold, the manifold directing the molten material the mold cavity housed within the mold assembly of the apparatus. The molten material conduit device includes a manifold-sealed interface effector for sealing against the manifold, and a back plate engager for engaging the back plate that secures the molten material conduit device to the manifold. The manifold, the molten material conduit device and the back plate are cooperatively configured such that a discharge end of the conduit device is sandwiched between the manifold and the back plate and such that the discharge opening is disposed in alignment with the molten material-receiver.

In a method and an injection-molding nozzle for producing injection-molded parts from plastic with an injection mold, the plastic melt in the form of at least one ribbon-like strand of melt is injected through a nozzle slit into a cavity of the injection mold before the injection-molded part is demolded once the plastic melt has solidified. The plastic melt is exposed to heat in the region of the sprue during solidifying in the cavity and the sprue is torn off during demolding of the injection-molded part along the nozzle slit in the region of the sprue as a result of the temperature gradient between the solidified injection-molded part and the plastic melt.

A hot runner system includes a manifold having a heater and a manifold channel network extending between a manifold inlet and a plurality of manifold outlets for distributing a molten plastic. A nozzle seated against the manifold and received in a respective manifold outlet has an extension portion received in the respective manifold outlet, a body portion projecting downstream from the extension portion, and a nozzle channel extending through the extension portion and the body portion. The hot runner system further includes a nozzle support seated against the nozzle, the nozzle support including an upstream nozzle support and a downstream nozzle support, the downstream nozzle support is discrete from and in slidable contact with the upstream nozzle support, and the downstream nozzle support having a looser fit with the body portion of the nozzle than that of the upstream nozzle support’s fit with the body portion of the nozzle.

An injection molding system comprising: a first selected valve, one or more downstream valves, delivering a fluid to a mold cavity, at least one fluid property sensor that detects a flow front of fluid material flowing downstream through the mold cavity at a trigger location within the cavity disposed between the first gate and at least one selected downstream gate, a controller instructing an actuator associated with the downstream gates to open the gates at a predetermined open gate target time on a first injection cycle, each valve associated with a position sensor that detects opening of a gate at an actual open gate time to the controller, the controller automatically adjusting time of instruction to open the gates on a subsequent injection cycle by an adjustment time equal to any delay in time between the predetermined open gate target time and the actual open gate time.