Thread for extruder screw, e.g. in a twin-screw extruder for separating liquid from solid components in rapeseed oil, comprises a thread root with a radially-extended ridge and a radially-extended groove

摘要

Thread for an extruder screw (especially in a twin-screw extruder for separating liquids from solids in material such as rapeseed oil), comprising a thread root (21a, 21b, 71a, 71b, 81a, 81b) with a ridge (23a, 23b, 73a, 73b, 83a, 83b) extending radially outwards from the root, also has a groove (25a, 25b, 75a, 75b, 85a, 85b) extending radially inwards from the root. Independent claims are also included for (1) a screw part with thread as above for mounting on the shaft of a screw extruder (2) a set of screw parts, at least one of which is a part with thread as above (3) a screw with at least one thread as above (4) a twin screw extruder with a pair of screws as above, the threads being arranged so that, when rotating, the ridge on one thread engages with the groove in the other .