Method of and system for heating and cooling an extruder cylinder

摘要

An extruder cylinder is heated by resistance heaters surrounding cooling coils around respective segments of the extruder cylinder which is subdivided into heating and heating or cooling zones therealong. The rate of flow of the heat-carrier oil in the coil or the rate of flow of a cooling medium in heat exchange therewith can be regulated to control the cooling effect of the heat-carrier oil which can continue to flow through the coil even during purely heating phases for temperature equalization over the zone.