Patent ID: 7549855

Claim:
An injection nozzle, comprising: a nozzle body having a first end and a second end; an inner body portion comprising a first material and including a melt channel, said inner body portion having a inlet face at a first end and a melt outlet at an opposite end; an outer body portion comprising a second material, said outer body portion having a seal face at a first end and a seal surface at a second end for sealing with the nozzle body, said outer body portion inducing a compressive force on said inner body portion at least during operation of said nozzle; a plane of said inlet face of said inner body portion intersecting said outer body portion, resulting in no portion of said first end of said inner body portion extending beyond said seal face of said outer body portion; and said first material having first thermal conduction coefficient and a first thermal expansion coefficient, said second material having a second thermal conduction coefficient and a second thermal expansion coefficient, at least one of said first thermal conduction coefficient and said first thermal expansion coefficient greater than said corresponding second thermal conduction and expansion coefficients of said second material.