Process for making a three-piece container involving stretch-blow molding, severing and attaching an end panel to the open bottom
US4988399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1989 |
| Grant date | Jan 29, 1991 |
| Priority date | — |
| Expiry date | Jul 5, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4992
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of producing a pair of container bodies. A cylindrical, hollow preform of a thermoplastic polymer material having a cylindrical body having a sidewall and an opened neck finish on each longitudinal end of the preform is provided. The preform is heated to a temperature above the glass transition temperature of the polymer and below the melting temperature of the polymer, and is stretched. The preform is stretched longitudinally by applying force to at least one of the ends, and is stretched transversely by introducing fluid pressure into the preform sufficient to form a stretch blown component having a first neck at one end and a second neck at the other end, and a body portion between the necks. The stretch blown component is separated transversely through the body to provide two container bodies, each having a neck finish corresponding dimensionally with the respective neck finish on the preform from which the container bodies are stretch-blown. The container bodies each have an open bottom end spaced longitudinally from the respective neck. A three-piece, biaxially oriented container is provided by attaching an end panel to the open bottom end of the container body and p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.