| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection nozzle capable of adequately and consistently performing injection even when injection molding is performed in a nozzle-touch state or in a state in which the nozzle temperature is not controlled in accordance with the molding cycle. SOLUTION: A nozzle (10) consists of a body part (10a) and a nozzle tip part (10b) of a small diameter on the tip side thereof, and has a first nozzle hole (11a), a second nozzle hole (11b) of the smaller diameter on the downstream side thereof, and a tip nozzle hole (11c) which is expanded in a tapered manner on the downstream side thereof. The length of the tip nozzle hole (11c) is set to be substantially equal to the length of the nozzle tip part (10b), and the length of the second nozzle hole (11b) is set to be the length in which a cold plug (1) is not grown to reach the first nozzle hole (11a). Preferably, the nozzle (10) has an engagement part (11d) on the boundary between the tip nozzle hole (11c) and the second nozzle hole (11b). COPYRIGHT: (C)2005,JPO&NCIPI
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