Injection nozzle with enhanced heat transfer characteristics

An injection nozzle for supplying hot resin from a resin manifold to a resin mold, said injection nozzle comprising:

• an elongated, structural outer body,
• said outer body having a base at a rear end thereof for establishing direct heat transfer contact with the manifold when the outer body is coupled with the manifold for transferring heat from the manifold to the base of the outer body,
• said outer body further having a shank projecting forwardly from the base toward the opposite front end of the outer body,
• said outer body having a hollow interior extending axially the full length of the outer body from a rear opening at said rear end to a front opening at the front end;
• and
• a thermally conductive, tubular insert received coaxially within said hollow interior of the outer body and having an axially extending internal passage for delivering hot resin from the manifold through the nozzle,
• said insert having a rear heat transfer portion in direct heat transfer contact with the interior of the base of the outer body for transferring heat from the base of the outer body to the insert via the heat transfer portion of the insert,
• said heat transfer portion of the insert having an exposed rear end that is disposed for direct heat transfer contact with the manifold when the outer body is coupled with the manifold for transferring heat from the manifold to the insert via said exposed rear end of the heat transfer portion of the insert,
• said insert further having an insulated portion that projects forwardly from the heat transfer portion,
• said insulated portion of the insert being diametrically inwardly spaced from the interior of the shank of the outer body to define an insulating gap that extends from the front end of the heat transfer portion of the insert to a front point of contact of the insert with the outer body, whereby to insulate the insulated portion of the insert against loss of heat that has been received by the heat transfer portion of the insert from the manifold through the base of the outer body and the exposed rear end of the heat transfer portion of the insert.

An injection nozzle for supplying hot resin from a resin manifold to a resin mold, said injection nozzle comprising:

• an elongated, structural outer body,
• said outer body having a base at a rear end thereof for establishing direct heat transfer contact with the manifold when the outer body is coupled with the manifold for transferring heat from the manifold to the base of the outer body,
• said outer body further having a shank projecting forwardly from the base toward the opposite front end of the outer body,
• said outer body having a hollow interior extending axially the full length of the outer body from a rear opening at said rear end to a front opening at the front end;
• and
• a thermally conductive, tubular insert received coaxially within said hollow interior of the outer body and having an axially extending internal passage for delivering hot resin from the manifold through the nozzle,
• said insert having a rear heat transfer portion in direct heat transfer contact with the interior of the base of the outer body along approximately 33% of the axial length of the nozzle for transferring heat from the base of the outer body to the insert via the heat transfer portion of the insert,
• said insert further having an insulated portion that projects forwardly from the heat transfer portion,
• said insulated portion of the insert being diametrically inwardly spaced from the interior of the shank of the outer body to define an insulating gap that extends from the front end of the heat transfer portion of the insert to a forwardmost gap end, whereby to insulate the insulated portion of the insert against loss of heat that has been received by the heat transfer portion of the insert from the base of the outer body.