| 摘要 |
PROBLEM TO BE SOLVED: To prevent seizure or damage of the bearing part or the like of a liquid circulating pump at the time of discharge of the high temp. liquid in a liquid circulating passage. SOLUTION: After a liquid circulating pump 71, a rod-shaped heater 67 and an injection molding machine are brought to a non-operative state, the opening and closing of an on-off valve 54 are alternately repeated in such a state that an on-off valve 38 is opened. Thereafter, when the temp. detected by a temp. sensor 8 becomes temp. below the b.p. of a liquid under atmospheric pressure, thd on-off valve 54 is kept opened.
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