Hot runner nozzle for injecting thermoplastic material into a moulding tool

摘要

The hot runner nozzle (1) for injecting plastic material into a molding tool comprises a needle valve with a nozzle needle (19) for closing the discharge opening (25). The nozzle needle (19) has the same diameter as the cylindrical bore in the discharge opening (25) and is inserted therein in order to close the cylindrical bore in the discharge opening (25). During the injection process the nozzle needle (19) is outside the melt flow and cannot cause said melt flow to swirl and is not radially loaded by the melt flow.

主权项

1. Hot runner nozzle for injecting plastic melt into a moulding tool, having a needle valve for closing a discharge opening at an end of an injection process having a needle and having a drive for the needle, the nozzle comprising:
a guide tube disposed within a nozzle body; the needle is mounted axially within the guide tube such that the needle is guided displaceably and without clearance within an entirety of the nozzle body coaxially to an axis of the discharge opening of the hot runner nozzle; and a longitudinal bore for the melt runs in an axis substantially parallel to an axis of the needle and radially outside the guide tube of the needle, wherein a bore section at an end of the longitudinal bore runs at an acute angle (α) to the axis of the longitudinal bore and creates a connection between the longitudinal bore and an entrance to a cylindrical region of the discharge opening.