Method of making a refillable polyester container
US5599496A · kind A · utility
30Cited by
35References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1994 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | Sep 27, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1397
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Method of making a refillable polyester container having a low orientation base with improved resistance to caustic wash cracking. The method includes providing a preform with an upper base-forming thickened portion which resists axial elongation (thereby increasing the orientation of the body) and a lower base-forming tapered portion which decreases in thickness so as to gradually reduce the wall thickness of a central dome in the container base. The bottom of the preform base includes a central thickened region which is maintained in a recess during blowing to insure centering and prevent the formation of stress concentrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.