High pressure injection nozzle

An injection nozzle apparatus comprising:

• inner means for conveying melt material, said inner means including melt channel means for guiding the melt material to a mold, said inner means having an outer diameter D1;
• and
• outer means for surrounding said inner means, said outer means inducing a compressive pre-load on said inner means when said outer means is assembled on said inner means.

An injection molding apparatus including:

• a nozzle body in communication with a source of molten material;
• a nozzle tip contacting said nozzle body, said nozzle tip comprising a pressure resistant material;
• a melt channel disposed inside said nozzle tip comprising a wear resistant material protecting said nozzle tip from wear caused by flow of the molten material, said nozzle tip inducing a compressive pre-load on said melt channel.

An injection nozzle comprising at least two concentric bodies made of different materials, whereby an outer body induces a compressive load upon an inner body during injection of molten material in a mold cavity and where the inner body comprises a melt channel for guiding the molten material towards the mold cavity.

An injection nozzle apparatus comprising:

• an inner body comprising a melt channel for guiding a molten material towards a cavity mold;
• an outer body comprising a material having different characteristics than said inner body and that is coaxial/concentric with said inner body, whereby said outer body induces a compressive load upon said inner body during injection of molten material in a mold cavity.