| 摘要 |
PROBLEM TO BE SOLVED: To stably form a solid plug at the tip part of nozzle hole in a nozzle body. SOLUTION: An exothermic body 17 formed by inserting a heater 11 surrounding an exothermic wire with an insulating body between an inner cylinder 15 and an outer cylinder 16, is press-fed into a cylindrical recessed part concentrically formed from the tip end side of the nozzle body 10. In such a way, since the exothermic body 17 is included in the nozzle body 10 and the nozzle body 10 can be heated always in the same state, the unevenness of the nozzle temp. and the temp. distribution is extremely small, and the solid plug 14 can suitably be controlled.
|
