| 摘要 |
Injection molding apparatus wherein a heated nozzle (18) extends into an opening (92) in a cooled mold. The nozzle (18) has a rear locating flange and a front locating and sealing ring (90) made of a deformable material. In the operating position, the rear locating flange (98) contacts a first tapered shoulder (102) around the opening (92) and the front locating and sealing ring (90) contacts a second tapered shoulder (104) around the opening (92). The first and second tapered shoulders (102, 104) are further apart than the rear locating flange (98) and the front locating and sealing ring (90). Thus, during insertion of the nozzle (18) into place in the opening (92) and thermal expansion of the nozzle, the rear locating flange (98) first comes into contact with the first tapered shoulder (102) to prealign the nozzle (18) before the front locating and sealing ring (90) comes into contact with the second shoulder (104) and is partially deformed thereby to very accurately align the tip (82) of the nozzle with the gate (22). |
