Method of injection molding a preform and apparatus for the same
US5589130A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1995 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | Mar 13, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/253
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection molding apparatus for a preform is disclosed, having an injection molding station (14) and a cooling and ejection station (16). In the injection molding station (14), neck cavity molds (60), injection core molds (50) and an injection cavity mold (42) are clamped and preforms (1) are injection molded. Thereafter, the injection cavity mold (42) is separated at a relatively high temperature. The preforms (1) are transferred to the cooling and ejection station (16) while being cooled by the injection core molds (50) and neck cavity molds (60). While the next preforms (1) are being injection molded in the injection molding station (14), in the cooling and ejection station (16) cooling of the preforms (1) continues. After cooling the preforms (1) to a temperature suitable for release, the injection core molds (50) are separated only through a stroke sufficient to allow a space to open between core pins (52) of the injection core molds 50 and the inner surface of the preforms (1). Thereafter the neck cavity molds (60) are separated and the preforms (1) are ejected. When the injection molding of the next preforms (1) in the injection molding station (14) is completed, a rotary…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.