High thermal transfer hollow core extrusion screw assembly

High heat transfer hollow core extrusion screws (50, 52, 124, 126, 190) include elongated hollow core shafts (54, 128, 130, 192) equipped with helical threads (56, 132, 134, 194) along their lengths. The helical threads (132, 134, 194) may also be of hollow construction communicating with the hollow core shafts (54, 128, 130, 192). A structure (88, 90) is provided for supplying heat exchange media (e.g., steam) to the hollow core shafts (54, 128, 130, 192) and the helical threads (132, 134, 194). The threads (56, 132, 134, 194) also include a forward and reverse passage section (64, 162, 216). Extrusion screws (50, 52, 124, 126, 190) are intended for use as complementary pairs as part of twin screw processing devices (20), and are designed to impart high levels of thermal energy to the materials being processed in the devices (20), without adding additional moisture. (Automatic translation with Google Translate, no legal value)