Abstract: The technical field of the invention broadly relates to injection molding systems and more particularly to cooling of a core used in a mold of an injection molding machine. Cooling a core involves supplying coolant through a lengthwise supply tube that extends within a hollow bore formed in the core. The coolant flows through the supply tube, exiting as a stream of fluid at an open end of the supply tube where the stream contacts a substantially perpendicular inner surface of the core. The stream of fluid is initially deflected by this inner surface on an axis perpendicular to an axis of the original flow producing a stagnation zone in the stream having zero or relatively low velocity. The stagnation zone is adjacent to a high heat gate area and results in poor cooling of the core tip. The invention solves the problem of stagnation by application of a fluid velocity inducer.

Abstract: An extruder for plasticizing and extruding a material. The extruder is formed from two interfitted orbital scroll members. Material, usually in a solid state, can be fed between the scroll members. As the scroll members are rotated eccentrically with respect to one another, the material is conveyed toward the center of the scroll members within a pocket of ever decreasing volume. This applies shear energy to the material which causes melting. Heaters can be provided in the scroll members to further aid and control the melting. By the time the material reaches the central output, it is in a molten state and can be extruded through an output. A method for extruding, and an injection molding machine using such an extruder to plasticize plastic resin, such as PET, is also described.