| 摘要 |
PROBLEM TO BE SOLVED: To reduce the dispersion of molding precision and finished product failure attributed to the dispersion of an internal temperature distribution of a molded object during cooling, in injection molding technique. SOLUTION: First, a plurality of temperature sensors 3 is arranged equally around each of a plurality of cavities 4 formed in a mold 1, and the temperature distribution is detected by an external temperature detector 8. Further, in a calculation/control device 9, the temperature width T<SB>2</SB>around the individual cavity 4, is calculated from the temperature detected by the temperature sensor 3, and the timing of opening the mold 1 is controlled through a molding machine-side control device 10 so as to open the mold 1 at the point of time when the temperature width T<SB>2</SB>to the target temperature width T<SB>1</SB>when the molded object is unloaded from the preset cavity 4, is T<SB>1</SB>>T<SB>2</SB>and the relationship between the inter target cavity temperature difference T<SB>3</SB>and the intercavity temperature difference T<SB>4</SB>is T<SB>3</SB>>T<SB>4</SB>. COPYRIGHT: (C)2008,JPO&INPIT
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