Side gating hot runner apparatus with continuous valve pin movement

Abstract

Actuator for a hot runner injection molding apparatus, comprising at least one nozzle for side gating with at least one valve gate comprising a valve pin for closing a communication opening in a mold cavity, a valve pin actuating means coupled with the at least one valve pin, which is moveable back and forth along a first axis (A), whereby the at least one valve pin is moveable along a second axis (B), which is arranged at an angle ([alpha]) to the first axis (A), and an actuator for driving the valve pin actuating means. The available speed of moving the valve pins and the possibility of multiple locations of positioning the valve pins relative to the mold gates ensures a a reduction of the injection pressure in the mold cavity and thus a reduction of mold core shifting, the possibility to fill at the same time mold cavities of different sizes and allows for defect free molded parts.

Description

technical field [0001] The invention relates to an electric actuator for a hot-runner injection molding machine having at least two separate nozzles for lateral gating, each nozzle containing at least one valve pin, operable with respect to at least two mold gates; and a valve pin actuation means comprising an electrical actuator for driving the valve pin. Background technique [0002] Current hot runner nozzles that use valve pins for side gating applications do not provide continuous movement of the valve pin relative to a single mold gate from a fully open position to a fully closed position and any other position between these extreme positions Unlimited positions to be able to manufacture parts of different sizes that require different amounts of melt material to be injected between the individual cavities. [0003] Additionally, current hot runner nozzles that use valve pins for side gating applications cannot balance mold flow from multiple nozzles into multiple cavi...

AI Technical Summary

Problems solved by technology

[0002] Current hot runner nozzles that use valve pins for side gating applications do not provide continuous movement of the valve pin relative to a single mold gate from a fully open position to a fully closed position and any other position between these extreme positions Unlimited positions to be able to manufacture parts of different sizes that require different amounts of melt material to be injected between the individual cavities

[0003] Additionally, current hot runner nozzles that use valve pins for side gating applications cannot balance mold flow from multiple nozzles into multiple cavities

[0004] Also, current hot runner nozzles that use valve pins for side gating are not configured to prevent or reduce core displacement due to the flow of melt at high injection pressures that passes through the mold gate, strikes the core at an angle relative to the axis of the core

[0005] Additionally, current hot runner nozzles that use valve pins for side gating are not configured to balance mold flow from multiple nozzles into multiple cavities

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