| 摘要 |
PURPOSE:To obtain the inside temperature of a cylinder correctly, by a method wherein the temperatures of a cylinder and resin at a plurality of different points in a radial direction from each other are measured, which are corrected by comparing the same with a model prepared beforehand, in a predetermined cross-sectional position in an axial direction of the injection cylinder. CONSTITUTION:A plurality of protrusions 16 is provided on predetermined cross-sectional positions A, A' in an axial direction of an injection cylinder 11 and a temperature detector 15 is proviced on the external circumferential part of the protrusions. The temperature detector 15 is formed of a thermocouple 15-1 for measurement of the temperatures of the cylinder at the vicinity r0 of an inside wall of the cylinder and the vicinity r1 of the external circumference of the same and a thermopile 15-2 for measurement of the temperature of resin to be obtained by connecting the thermocouples to detect a temperature difference between the vicinity r0 of the inside wall of the cylinder and a contact point r2 of the inside of the protrusion 16 in series in the circumferential direction of the cylinder with each other. A model prepared beforehand by a shape of the cylinder and a physical property value and measured temperature values of the cylinder and the resin are compared with each other, the measure temperature values are adjusted one after another and the resin temperature in the inside of the cylinder is obtained through calculation. |
