| 摘要 |
PROBLEM TO BE SOLVED: To enable the temperature gradient in the axial direction of an injection nozzle to be adjusted without changing the position of a temperature sensor and the molding process to be performed at a heating temperature of the temperature gradient suited for a material. SOLUTION: Heaters 4 and 5 are mounted in heating zones H1 and H2 demarcated in the axial direction of the outer periphery of the injection nozzle 3 and temperature sensors 7a, 7b and 7c are installed at positions on both sides of each of the heating zones H1 and H2. The temperatures (T1 and T2) and (T3 and T4) detected by the temperature sensors (7a and 7b) and (7b and 7c) on both sides of each of the heating zones H1 and H2 are entered to arithmetic circuits 8 and 9 set corresponding to the individual heating zones H1 and H2 and in the arithmetic circuits 8 and 9, virtual temperatures PV1 and PV2 are sought by a specified operation expression based on each of weight factors A, B, C and D set in weight setters 10 and 11. Then the virtual temperatures PV1 and PV2 are entered to temperature regulators 12 and 13. The temperature regulators 12 and 13 regulate the heating temperatures of the heaters 4 and 5 based on the virtual temperatures PV1 and PV2 respectively.
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