| 摘要 |
PROBLEM TO BE SOLVED: To prevent a drop of a temperature even when a nozzle of a molding machine is brought into contact with a nozzle bush and to eliminate a cold slag by forming a nozzle touching part of the bush in a mold of a heat insulator. SOLUTION: When a fixed mold 1 and a movable mold 2 attached to a molding machine are closed and injecting is started, a nozzle of the machine is brought into contact with a nozzle touching part 32 of a nozzle bush 3. Molten resin is filled in a cavity 4 from the nozzle through a channel of the part 32 and a channel of a sprue bush body 31. In this case, the part 32 is formed of an insulator having smaller thermal conductivity than that of a thermosetting resin, ceramics or the like, and heat insulated from the body 31. Thus, heat of the nozzle is prevented from being derived by the bush 3, and hence a temperature drop of the resin in the nozzle and a cold slag are eliminated.
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