JPH0380609B

PURPOSE:To achieve a larger discharge capacity of resin, a less scorching and a saved energy by predetermining the temperature distribution in the cylinder itself to be optimal for molding as desired with the type of resin and the revolution of the screw as parameters to control the temperature of the cylinder properly. CONSTITUTION:A microcomputer 11 separately determines what temperature distribution of resin in the cylinder can eliminate troubles such as scorching to ensure a better extrusion work. To secure such a pattern, the temperature of individual temperature measuring zones of the cylinder is controlled for respective revolutions of the screw and the optimum cylinder temperature distributions thus set are recorded individually. Then, this setting is done separately in terms of the brand of resin. The actual temperatures of the individual temperature measuring zones obtained from temperature measuring elements TC2-TC5 are compared with optimum cylinder temperature distributions previously inputted referring to the revolutions of the screw to determine a deviation, based on which a heater 6 or cooler 7 is operated.