| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fluid from flowing into an extruder cylinder from a fluid injection nozzle when the inside of the extruder cylinder is in vacuum. SOLUTION: The fluid injection nozzle 1 has the main body 1a in which the perforation 10 is formed, the tie 2 in which the perforation 11 is formed, the inflow prevention part 3 to prevent the fluid from flowing into the inside of the extruder cylinder 20, and the back flow prevention part 4 to prevent the resin from back-flow. The inflow prevention part 3 has the ball 6, the ball bed 7 supporting the ball 6, the spring 8 which urges the ball bed 7, and the liner 9 supported by the retaining part 10b. There is formed on the ball bed 7 the groove 7b, i.e. passage along which the fluid passes. The spring 8 is a coil spring with the urging force so set that it may not contract only with the vacuum inside the extruder cylinder 20. The back-flow prevention part 4 has the ball 12 and the ball bed 5 which accepts the ball 12. COPYRIGHT: (C)2004,JPO
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