A hot-runner injection molding apparatus that facilitates use of electric actuators in a compact design includes a hot-runner manifold defining resin channels for conveying resin to nozzles that serve as conduits for introducing liquid resin into a mold cavity, a valve pin configured for linear movement along a longitudinal axis of the nozzle to control flow of liquid resin through the nozzle, and an electric actuator having a body containing an electric motor, wherein the electric actuator body includes channels for circulating a coolant.

An extruding unit, a forming roll unit and a thick portion forming mechanism are provided. The extruding unit has an ejecting slit which ejects sheet-shaped molten resin. The ejecting slit includes a standard gap portion and an enlarged gap portion. The standard gap portion is formed as a gap having a constant size. The enlarged gap portion is formed as a gap larger than the standard gap portion in a position corresponding to a thick portion. The thick portion forming mechanism forms one or several thick portions which are thicker than other portion, in the sheet-shaped molten resin continuously in the extrusion direction.

A purpose of the present disclosure is to provide a fine pattern transfer mold and a fine pattern molding method that allow high-resolution transfer of a fine pattern to the interior of a hollow product by integral molding. In a product formation chamber that is formed between a cavity and a core pin member having a predetermined portion at which a fine pattern original plate is fixed by closing of a mold body, a gate into which a molten resin material flows from a hot runner member has an opening that is located outside an end of a fixed surface of the fine pattern original plate in a horizontal direction of the fixed surface and that faces the end of the fixed surface, an injection nozzle of the hot runner member and the gate are directly coupled together, and the hollow product is integrally molded by the resin material flowing from the gate.

An injection molding apparatus (5) comprising: an actuator (10) comprising a thermally conductive housing body (12) mounted in direct heat or thermally conductive contact with one or more mounts (60, 50, 803) that are in turn mounted in direct heat conductive contact or communication with the manifold (20), the cooling device (500, 800) comprising a heat transmitter comprised of an arm, member (502) or leg (800I) that is either: disposed in direct or integral thermal contact with a complementary surface (12Is) of the actuator (10) or, configured to have compressible spring joints (800s).

An injection-molding method includes providing an extruding system configured to produce a mixture, a first discharging channel including a first outlet, a second discharging channel including a second outlet, and a molding device including a space and first and second feeding ports communicable with the space and respectively engageable with the first and second outlets; engaging the first outlet with the first feeding port; engaging the second outlet with the second feeding port; injecting the mixture through the first outlet and the first feeding port; and injecting the mixture through the second outlet and the second feeding port.

A hot-runner injection molding apparatus that facilitates use of actuators in a compact design includes a hot-runner manifold defining resin channels for conveying resin to nozzles that serve as conduits for introducing liquid resin into a mold cavity, a valve pin configured for linear movement along a longitudinal axis of the nozzle to control flow of liquid resin through the nozzle, and an actuator having a housing, wherein the valve pin is coupled to a drive shaft within the housing.

An improved actuator for a valve gate assembly is provided. The actuator includes a planetary assembly for converting rotation of an electrical motor into linear movement of a valve gate pin while also providing mechanical advantage to the motor against injection pressures from 15,000 psi to at least 25,000 psi. An internal cooling volume surrounds the motor for continuously cooling the motor with water, and an internal encoder converts an angular rotation within the actuator into an analog or digital signal for output to a controller.

A heater and thermocouple assembly for use with a hot runner nozzle with an elongated heater body, said heater body having at least one first heating section, which in operation is positioned adjacent to the front end portion of the hot runner nozzle, and at least one second heating section which in operation is positioned adjacent to a nozzle head of the hot runner nozzle and has an at least partly annular distance section with a wall which is arranged between the first and second heating sections.

An injection molding machine includes an edge gate nozzle with a nozzle body having a primary melt channel and a nozzle head having first and second secondary melt channels that feed melt to first and second nozzle tips. First and second heaters are disposed in the nozzle head to provide heat to the secondary melt channels. In some embodiments, the heaters are positioned adjacent to the secondary melt channels, with first heater is closer to the first secondary melt channel than to the second secondary melt channel. In some embodiments, the heaters are positioned adjacent to the nozzle tips, with the first heater closer to the first nozzle tip than to the second nozzle tip. In some embodiments, each heater is adjacent to both the respective nozzle tip and secondary melt channel. In some embodiments, each heater is individually controllable.

An injection molding apparatus and method for adjusting the axial position of a valve pin in an injection molding system, the apparatus comprising: a top clamp plate, a heated manifold receiving and distributing an injection fluid to an exit of a fluid delivery channel to a cavity of the mold, an actuator comprising a housing having a chamber enclosing a drive member for driving a valve pin along an axial path of travel, the actuator housing slidably mounted and adapted for controlled upstream and downstream movement of the drive member along a path complementary to the axial path of travel of the valve pin, a mounting plate and an axial position adjustment screw screwably mounted within the mounting plate upstream of the housing of the actuator for controllably moving the valve pin to selectable starting or ending injection cycle axial positions.