Hot runner injection nozzle system suitable for co-injection molding with built-in obturator and variable gate direction

Abstract

A hot runner injection nozzle system for use in co-injection molding with a built-in obturator valve (7) in a nozzle tip assembly (16) attached to a nozzle body (1) and permits several different directions of gating. It allows for independent flow of each melt stream having their confluence at the very last possible position avoiding mutual contamination with the built-in obturator (7). The nozzle tip assembly comprises several channels providing for the flow of multiple polymeric melt streams and an obturator that serves as a check valve. Selective flow of each stream is fully controlled by individual injection units at the source providing the feed for each melt stream. The invention allows for simple fabrication, maintenance, reduces mutual contamination and allows for a more compact hot runner manifold and tool design. It allows for an optional needle-valve when the product requires a better injection point finish.

Dependencies are inferred from the claim text.