Blow molding method for producing pasteurizable containers
US6485670B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1999 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Nov 9, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/904
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing a biaxially oriented, heat set plastic container, including the steps of providing a plastic preform within a mold cavity; expanding and stretching the plastic preform into conformity with the surfaces defining the mold cavity to form a biaxially oriented plastic container; inducing crystallinity in the plastic container by using convection heat transfer to heat a surface of the plastic container to a temperature of at least 120° C.; and removing the plastic container from the mold cavity. The PET containers produced by the method have an average sidewall crystallinity greater than about 30%, which allows the PET container to maintain its material integrity during any subsequent pasteurization or retort process of the contents in the PET container, and during shipment of the PET container.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.