Hot Runner Nozzle for Injecting Thermoplastic Material into a Moulding Tool
AssigneeSchottli AG
InventorWilli Manz
Life of this patent
Estimating the term…
Abstract
The hot runner nozzle (1) for injecting plastic material into a moulding 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.
Claims7
Hot runner nozzle (1) for injecting plastic into a moulding tool (33), having a needle valve for closing the discharge opening (25) at the end of the injection process having a valve needle (19) and having a drive (3) for the valve needle (19), characterised in that:
- the nozzle needle (19) is mounted axially guided displaceably in a nozzle body (5) [sic] coaxially to the axis of the discharge opening (25) of the hot runner nozzle (1) in a guide tube (21),
- a longitudinal bore (23) for the melt runs in an axis substantially parallel to the axis of the nozzle needle (19) and radially outside the guide tube (21) of the nozzle needle (19), wherein a bore section (23′) at the end of the longitudinal bore (23) runs at an acute angle (α) to the axis of the longitudinal bore (23) and creates a connection between the longitudinal bore (23) and the entrance to the cylindrical region (26) of the discharge opening (25).
Dependencies are inferred from the claim text.