Patent ID: 7063453

Claim:
An apparatus for plasticating resinous material, comprising: a barrel formed of material having a first coefficient of thermal conduction, including a wall extending axially and laterally and having an outer surface and an inner surface, the wall having a thickness formed with mutually spaced holes extending at least partially through the thickness; and conductors having a second coefficient of thermal conduction greater than the first coefficient, each conductor located in and engaging a hole, each hole is any of a first group including a cylindrical hole, a stepped cylindrical hole and a conical holes, each hole including a radial surface and a radially inner bottom surface, the radial surface extending from the outer surface partially through the thickness toward the inner surface and the bottom surface, the bottom surface having any of a second group including a flat surface, a beveled surface, and a surface having a spherical radius; and each conductor is any of third group including a cylinder, a stepped cylinder and a conical cylinder, each conductor being sized to fit within its corresponding hole and to engage the radial surface of said hole.