| 摘要 |
A preform assembly (20) for blow molding a container includes a molded plastic preform (22) having an open mouth, a neck (28) surrounding the mouth with an external surface at a first diameter, an external flange (30) at one end of the neck surrounding the mouth, and a preform body (26) integrally molded with the neck at an end of the neck spaced from the flange. The preform body has a second external diameter that is greater than the first diameter of the neck external surface. A circumferentially continuous molded plastic finish ring (24) is externally secured over the external surface of the neck between the flange and the preform body. In the preferred embodiments of the invention, the finish ring is secured to the preform neck by expanding the ring over the flange, most preferably using a mandrel 40, and then allowing the ring resiliently to shrink onto the external surface of the neck. |
